From 8a9240bb95eafc9287f864c5ba84f3a9e692b2d7 Mon Sep 17 00:00:00 2001
From: Yumeno Yuuka <sounyan.is.the.angel@gmail.com>
Date: Fri, 3 Apr 2026 09:24:41 +0900
Subject: [PATCH 1/8] feat(rust): add kopdeltav models crate with constants,
 structs, and hermite interpolation

Port Python kopdeltav/models.py to Rust as a separate workspace crate
(crates/kopdeltav) to isolate core physics from Tauri dependencies.

Includes: CurveKey, Atmosphere, OrbitalElements, CelestialBody structs,
G0/R_GAS constants, compute_mu(), and KSP AnimationCurve-compatible
hermite_interp(). All 11 tests pass, clippy clean.
---
 src-tauri/Cargo.lock                     | 5166 ++++++++++++++++++++++
 src-tauri/Cargo.toml                     |    4 +
 src-tauri/crates/kopdeltav/Cargo.toml    |    7 +
 src-tauri/crates/kopdeltav/src/lib.rs    |    1 +
 src-tauri/crates/kopdeltav/src/models.rs |  404 ++
 5 files changed, 5582 insertions(+)
 create mode 100644 src-tauri/Cargo.lock
 create mode 100644 src-tauri/crates/kopdeltav/Cargo.toml
 create mode 100644 src-tauri/crates/kopdeltav/src/lib.rs
 create mode 100644 src-tauri/crates/kopdeltav/src/models.rs

diff --git a/src-tauri/Cargo.lock b/src-tauri/Cargo.lock
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index 0000000..5226587
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diff --git a/src-tauri/Cargo.toml b/src-tauri/Cargo.toml
index 7f381be..1433353 100644
--- a/src-tauri/Cargo.toml
+++ b/src-tauri/Cargo.toml
@@ -1,3 +1,6 @@
+[workspace]
+members = ["crates/kopdeltav"]
+
 [package]
 name = "kspdeltavformods"
 version = "0.1.0"
@@ -7,6 +10,7 @@ edition = "2021"
 tauri-build = { version = "2", features = [] }
 
 [dependencies]
+kopdeltav = { path = "crates/kopdeltav" }
 tauri = { version = "2", features = [] }
 tauri-plugin-shell = "2"
 tauri-plugin-dialog = "2"
diff --git a/src-tauri/crates/kopdeltav/Cargo.toml b/src-tauri/crates/kopdeltav/Cargo.toml
new file mode 100644
index 0000000..7f14a8f
--- /dev/null
+++ b/src-tauri/crates/kopdeltav/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "kopdeltav"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+serde = { version = "1", features = ["derive"] }
diff --git a/src-tauri/crates/kopdeltav/src/lib.rs b/src-tauri/crates/kopdeltav/src/lib.rs
new file mode 100644
index 0000000..c446ac8
--- /dev/null
+++ b/src-tauri/crates/kopdeltav/src/lib.rs
@@ -0,0 +1 @@
+pub mod models;
diff --git a/src-tauri/crates/kopdeltav/src/models.rs b/src-tauri/crates/kopdeltav/src/models.rs
new file mode 100644
index 0000000..ae7b93d
--- /dev/null
+++ b/src-tauri/crates/kopdeltav/src/models.rs
@@ -0,0 +1,404 @@
+//! Core domain models for KSP celestial body physics.
+//!
+//! Provides data structures for celestial bodies, atmospheres, orbital elements,
+//! and animation curve interpolation (Cubic Hermite Spline) compatible with
+//! KSP's AnimationCurve format.
+
+use serde::Serialize;
+
+// ---------------------------------------------------------------------------
+// Constants
+// ---------------------------------------------------------------------------
+
+/// Standard gravitational acceleration at sea level [m/s^2].
+pub const G0: f64 = 9.80665;
+
+/// Universal gas constant [J/(mol*K)].
+pub const R_GAS: f64 = 8.314_462_618;
+
+// ---------------------------------------------------------------------------
+// Functions
+// ---------------------------------------------------------------------------
+
+/// Compute the standard gravitational parameter (mu) for a celestial body.
+///
+/// mu = gee_asl * G0 * radius^2
+///
+/// # Arguments
+/// * `gee_asl` - Surface gravity in multiples of g0.
+/// * `radius` - Equatorial radius [m].
+///
+/// # Returns
+/// Gravitational parameter mu [m^3/s^2].
+pub fn compute_mu(gee_asl: f64, radius: f64) -> f64 {
+    gee_asl * G0 * radius * radius
+}
+
+// ---------------------------------------------------------------------------
+// Structs
+// ---------------------------------------------------------------------------
+
+/// A single keyframe in a KSP AnimationCurve.
+///
+/// KSPのAnimationCurveキーフレーム。
+#[derive(Debug, Clone, Serialize)]
+pub struct CurveKey {
+    /// Curve position (x-axis value, e.g. altitude).
+    pub position: f64,
+    /// Curve value at this position (y-axis value).
+    pub value: f64,
+    /// Incoming tangent (slope on the left side of the key).
+    pub in_tangent: f64,
+    /// Outgoing tangent (slope on the right side of the key).
+    pub out_tangent: f64,
+}
+
+/// Atmospheric model for a celestial body.
+///
+/// 天体の大気モデル。
+#[derive(Debug, Clone, Serialize)]
+pub struct Atmosphere {
+    /// Height of the atmosphere above the surface [m].
+    pub atmosphere_depth: f64,
+    /// Pressure curve keyframes (altitude -> pressure in kPa).
+    pub pressure_curve: Vec<CurveKey>,
+    /// Temperature curve keyframes (altitude -> temperature in K).
+    pub temperature_curve: Vec<CurveKey>,
+    /// Molar mass of the atmosphere [kg/mol].
+    pub molar_mass: f64,
+    /// Adiabatic index (ratio of specific heats, Cp/Cv).
+    pub adiabatic_index: f64,
+    /// Sea-level pressure [kPa].
+    pub pressure_at_sea_level: f64,
+    /// Sea-level temperature [K].
+    pub temperature_at_sea_level: f64,
+}
+
+/// Keplerian orbital elements for a celestial body.
+///
+/// 天体のケプラー軌道要素。
+#[derive(Debug, Clone, Serialize)]
+pub struct OrbitalElements {
+    /// Semi-major axis [m].
+    pub semi_major_axis: f64,
+    /// Orbital eccentricity (0 = circular, <1 = elliptical).
+    pub eccentricity: f64,
+    /// Orbital inclination [degrees].
+    pub inclination: f64,
+    /// Argument of periapsis [degrees].
+    pub argument_of_periapsis: f64,
+    /// Longitude of ascending node [degrees].
+    pub longitude_of_ascending_node: f64,
+    /// Mean anomaly at epoch [radians].
+    pub mean_anomaly_at_epoch: f64,
+    /// Reference epoch [s].
+    pub epoch: f64,
+}
+
+/// A celestial body in the KSP system with physical and orbital properties.
+///
+/// KSPの天体（物理・軌道パラメータ付き）。
+///
+/// Not `Serialize` because parent/children references form a graph
+/// that is resolved externally by name.
+#[derive(Debug, Clone)]
+pub struct CelestialBody {
+    /// Internal name (e.g. "Kerbin").
+    pub name: String,
+    /// Equatorial radius [m].
+    pub radius: f64,
+    /// Surface gravity in multiples of g0.
+    pub gee_asl: f64,
+    /// Whether the body has an ocean.
+    pub has_ocean: bool,
+    /// Atmospheric model, if present.
+    pub atmosphere: Option<Atmosphere>,
+    /// Orbital elements, if the body orbits another body.
+    pub orbit: Option<OrbitalElements>,
+    /// Sidereal rotational period [s].
+    pub rotational_period: f64,
+    /// Display name (may differ from internal name).
+    pub display_name: String,
+    /// Sphere of influence radius [m].
+    pub soi: f64,
+    /// Whether this is the home world (e.g. Kerbin).
+    pub is_home_world: bool,
+    /// Name of the parent body this body orbits.
+    pub reference_body_name: String,
+    /// Standard gravitational parameter mu [m^3/s^2] (auto-computed).
+    pub mu: f64,
+    /// Parent body name for tree construction.
+    pub parent_name: Option<String>,
+    /// Child body names for tree construction.
+    pub children_names: Vec<String>,
+}
+
+impl CelestialBody {
+    /// Create a new celestial body with auto-computed mu.
+    ///
+    /// 天体を生成し、muを自動計算する。
+    ///
+    /// # Arguments
+    /// * `name` - Internal name.
+    /// * `radius` - Equatorial radius [m].
+    /// * `gee_asl` - Surface gravity in multiples of g0.
+    /// * `has_ocean` - Whether the body has an ocean.
+    /// * `atmosphere` - Atmospheric model, if any.
+    /// * `orbit` - Orbital elements, if any.
+    /// * `rotational_period` - Sidereal rotational period [s].
+    /// * `display_name` - Display name for UI.
+    #[allow(clippy::too_many_arguments)]
+    pub fn new(
+        name: String,
+        radius: f64,
+        gee_asl: f64,
+        has_ocean: bool,
+        atmosphere: Option<Atmosphere>,
+        orbit: Option<OrbitalElements>,
+        rotational_period: f64,
+        display_name: String,
+    ) -> Self {
+        let mu = compute_mu(gee_asl, radius);
+        Self {
+            name,
+            radius,
+            gee_asl,
+            has_ocean,
+            atmosphere,
+            orbit,
+            rotational_period,
+            display_name,
+            soi: 0.0,
+            is_home_world: false,
+            reference_body_name: String::new(),
+            mu,
+            parent_name: None,
+            children_names: Vec::new(),
+        }
+    }
+
+    /// Returns true if the body has an atmosphere.
+    ///
+    /// 大気を持つかどうかを返す。
+    pub fn has_atmosphere(&self) -> bool {
+        self.atmosphere.is_some()
+    }
+}
+
+// ---------------------------------------------------------------------------
+// Hermite interpolation
+// ---------------------------------------------------------------------------
+
+/// Evaluate a Cubic Hermite Spline at position `x`, compatible with KSP AnimationCurve.
+///
+/// KSP AnimationCurve互換のCubic Hermite Spline補間。
+///
+/// Values outside the curve range are clamped to the nearest endpoint value.
+///
+/// # Arguments
+/// * `keys` - Sorted keyframes defining the curve.
+/// * `x` - Position to evaluate at.
+///
+/// # Returns
+/// Interpolated value, or an error if `keys` is empty.
+///
+/// # Errors
+/// Returns `Err` if the keys slice is empty.
+pub fn hermite_interp(keys: &[CurveKey], x: f64) -> Result<f64, String> {
+    if keys.is_empty() {
+        return Err("Cannot interpolate with empty keys list".to_string());
+    }
+    if keys.len() == 1 {
+        return Ok(keys[0].value);
+    }
+    if x <= keys[0].position {
+        return Ok(keys[0].value);
+    }
+    if x >= keys[keys.len() - 1].position {
+        return Ok(keys[keys.len() - 1].value);
+    }
+
+    // Find the segment containing x
+    let mut i = 0;
+    for (j, key) in keys.iter().enumerate().skip(1) {
+        if key.position >= x {
+            i = j - 1;
+            break;
+        }
+    }
+
+    let k0 = &keys[i];
+    let k1 = &keys[i + 1];
+    let dx = k1.position - k0.position;
+    let t = (x - k0.position) / dx;
+
+    let t2 = t * t;
+    let t3 = t2 * t;
+    let h00 = 2.0 * t3 - 3.0 * t2 + 1.0;
+    let h10 = t3 - 2.0 * t2 + t;
+    let h01 = -2.0 * t3 + 3.0 * t2;
+    let h11 = t3 - t2;
+
+    Ok(h00 * k0.value + h10 * dx * k0.out_tangent + h01 * k1.value + h11 * dx * k1.in_tangent)
+}
+
+// ---------------------------------------------------------------------------
+// Tests
+// ---------------------------------------------------------------------------
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    // Constants
+    #[test]
+    fn test_g0_constant() {
+        assert!((G0 - 9.80665).abs() < 1e-10);
+    }
+
+    // compute_mu
+    #[test]
+    fn test_compute_mu_sanctar() {
+        let mu = compute_mu(1.1, 670_000.0);
+        let expected = 4.8424e12;
+        assert!((mu - expected).abs() / expected < 0.001);
+    }
+
+    #[test]
+    fn test_compute_mu_kerbin() {
+        let mu = compute_mu(1.0, 600_000.0);
+        let expected = 3.5316e12;
+        assert!((mu - expected).abs() / expected < 0.001);
+    }
+
+    // CurveKey
+    #[test]
+    fn test_curve_key_creation() {
+        let key = CurveKey {
+            position: 0.0,
+            value: 110.444,
+            in_tangent: 0.0,
+            out_tangent: -0.01793,
+        };
+        assert!((key.value - 110.444).abs() < 1e-6);
+    }
+
+    // Hermite interpolation
+    #[test]
+    fn test_hermite_interp_at_key_position() {
+        let keys = vec![
+            CurveKey {
+                position: 0.0,
+                value: 110.444,
+                in_tangent: 0.0,
+                out_tangent: -0.01793,
+            },
+            CurveKey {
+                position: 3547.0,
+                value: 62.1074,
+                in_tangent: -0.01093,
+                out_tangent: -0.01093,
+            },
+        ];
+        let result = hermite_interp(&keys, 0.0).unwrap();
+        assert!((result - 110.444).abs() < 1e-6);
+    }
+
+    #[test]
+    fn test_hermite_interp_midpoint() {
+        let keys = vec![
+            CurveKey {
+                position: 0.0,
+                value: 110.444,
+                in_tangent: 0.0,
+                out_tangent: -0.01793,
+            },
+            CurveKey {
+                position: 3547.0,
+                value: 62.1074,
+                in_tangent: -0.01093,
+                out_tangent: -0.01093,
+            },
+        ];
+        let result = hermite_interp(&keys, 1773.5).unwrap();
+        assert!(result > 62.0 && result < 111.0);
+    }
+
+    #[test]
+    fn test_hermite_interp_clamps_below() {
+        let keys = vec![
+            CurveKey {
+                position: 0.0,
+                value: 110.444,
+                in_tangent: 0.0,
+                out_tangent: -0.01793,
+            },
+            CurveKey {
+                position: 3547.0,
+                value: 62.1074,
+                in_tangent: -0.01093,
+                out_tangent: -0.01093,
+            },
+        ];
+        let result = hermite_interp(&keys, -100.0).unwrap();
+        assert!((result - 110.444).abs() < 1e-6);
+    }
+
+    #[test]
+    fn test_hermite_interp_clamps_above() {
+        let keys = vec![
+            CurveKey {
+                position: 0.0,
+                value: 110.444,
+                in_tangent: 0.0,
+                out_tangent: -0.01793,
+            },
+            CurveKey {
+                position: 3547.0,
+                value: 62.1074,
+                in_tangent: -0.01093,
+                out_tangent: -0.01093,
+            },
+        ];
+        let result = hermite_interp(&keys, 5000.0).unwrap();
+        assert!((result - 62.1074).abs() < 1e-6);
+    }
+
+    #[test]
+    fn test_hermite_interp_empty_keys() {
+        let keys: Vec<CurveKey> = vec![];
+        assert!(hermite_interp(&keys, 0.0).is_err());
+    }
+
+    // CelestialBody
+    #[test]
+    fn test_celestial_body_mu() {
+        let body = CelestialBody::new(
+            "Kerbin".to_string(),
+            670_000.0,
+            1.1,
+            true,
+            None,
+            None,
+            90291.8,
+            "Sanctar".to_string(),
+        );
+        let expected = 4.8424e12;
+        assert!((body.mu - expected).abs() / expected < 0.001);
+    }
+
+    #[test]
+    fn test_celestial_body_has_atmosphere() {
+        let body_no_atmo = CelestialBody::new(
+            "Moon".to_string(),
+            200_000.0,
+            0.166,
+            false,
+            None,
+            None,
+            0.0,
+            "Moon".to_string(),
+        );
+        assert!(!body_no_atmo.has_atmosphere());
+    }
+}

From 45c5d1c0580d386d0e7a373da23e57618a14eec3 Mon Sep 17 00:00:00 2001
From: Yumeno Yuuka <sounyan.is.the.angel@gmail.com>
Date: Fri, 3 Apr 2026 09:32:51 +0900
Subject: [PATCH 2/8] feat(rust): implement Kopernicus ConfigNode parser

Port the Python kopdeltav/parser.py to Rust with 1:1 logic parity.
Two-layer design: low-level ConfigNode tree parser and high-level
CelestialBody extractor. Handles comments, MM modifiers, delete
directives, curve keys with tangent defaults, inline brace formats,
unclosed brace recovery, and #LOC_ display name fallback.
---
 src-tauri/crates/kopdeltav/src/lib.rs    |   1 +
 src-tauri/crates/kopdeltav/src/parser.rs | 856 +++++++++++++++++++++++
 2 files changed, 857 insertions(+)
 create mode 100644 src-tauri/crates/kopdeltav/src/parser.rs

diff --git a/src-tauri/crates/kopdeltav/src/lib.rs b/src-tauri/crates/kopdeltav/src/lib.rs
index c446ac8..3031dbb 100644
--- a/src-tauri/crates/kopdeltav/src/lib.rs
+++ b/src-tauri/crates/kopdeltav/src/lib.rs
@@ -1 +1,2 @@
 pub mod models;
+pub mod parser;
diff --git a/src-tauri/crates/kopdeltav/src/parser.rs b/src-tauri/crates/kopdeltav/src/parser.rs
new file mode 100644
index 0000000..029f316
--- /dev/null
+++ b/src-tauri/crates/kopdeltav/src/parser.rs
@@ -0,0 +1,856 @@
+//! Kopernicus ConfigNode parser for KSP `.cfg` files.
+//!
+//! Two-layer design:
+//! 1. **Low-level**: `ConfigNode` tree parsed from raw text.
+//! 2. **High-level**: `parse_bodies` extracts `CelestialBody` instances from the tree.
+//!
+//! KSP ConfigNodeパーサー（2層構成）。
+
+use crate::models::{Atmosphere, CelestialBody, CurveKey, OrbitalElements};
+
+// ---------------------------------------------------------------------------
+// Constants
+// ---------------------------------------------------------------------------
+
+/// Characters used as ModuleManager modifier prefixes on node names.
+const MODIFIER_CHARS: &[char] = &['@', '!', '+', '-', '%'];
+
+// ---------------------------------------------------------------------------
+// ConfigNode
+// ---------------------------------------------------------------------------
+
+/// A node in the KSP ConfigNode tree.
+///
+/// KSP ConfigNodeツリーのノード。
+#[derive(Debug, Clone)]
+pub struct ConfigNode {
+    /// Node name (modifiers stripped).
+    pub name: String,
+    /// Key-value pairs declared directly in this node.
+    pub values: Vec<(String, String)>,
+    /// Child nodes.
+    pub children: Vec<ConfigNode>,
+}
+
+impl ConfigNode {
+    /// Create a new empty ConfigNode with the given name.
+    fn new(name: impl Into<String>) -> Self {
+        Self {
+            name: name.into(),
+            values: Vec::new(),
+            children: Vec::new(),
+        }
+    }
+
+    /// Get the first value for a given key, or `None` if not found.
+    ///
+    /// 指定キーの最初の値を返す。
+    pub fn get_value(&self, key: &str) -> Option<&str> {
+        self.values
+            .iter()
+            .find(|(k, _)| k == key)
+            .map(|(_, v)| v.as_str())
+    }
+
+    /// Get all values for a given key.
+    ///
+    /// 指定キーの全値を返す。
+    pub fn get_values(&self, key: &str) -> Vec<&str> {
+        self.values
+            .iter()
+            .filter(|(k, _)| k == key)
+            .map(|(_, v)| v.as_str())
+            .collect()
+    }
+
+    /// Get the first child node with the given name, or `None`.
+    ///
+    /// 指定名の最初の子ノードを返す。
+    pub fn get_child(&self, name: &str) -> Option<&ConfigNode> {
+        self.children.iter().find(|c| c.name == name)
+    }
+}
+
+// ---------------------------------------------------------------------------
+// Low-level parser
+// ---------------------------------------------------------------------------
+
+/// Strip `//` comments from a line and trim whitespace.
+fn strip_comments(line: &str) -> &str {
+    match line.find("//") {
+        Some(idx) => line[..idx].trim(),
+        None => line.trim(),
+    }
+}
+
+/// Remove ModuleManager modifier prefixes, colon annotations, and bracket
+/// expressions from a raw node name.
+fn clean_node_name(raw: &str) -> String {
+    let mut s = raw.trim();
+
+    // Strip leading modifier chars
+    while let Some(first) = s.chars().next() {
+        if MODIFIER_CHARS.contains(&first) {
+            s = &s[first.len_utf8()..];
+        } else {
+            break;
+        }
+    }
+
+    // Strip :AFTER[...] etc.
+    if let Some(colon_idx) = s.find(':') {
+        s = &s[..colon_idx];
+    }
+
+    // Strip [Name] bracket expressions
+    if let Some(bracket_idx) = s.find('[') {
+        s = &s[..bracket_idx];
+    }
+
+    s.trim().to_string()
+}
+
+/// Returns true if the line is a delete directive like `!Body[Kerbin]{}`.
+fn is_delete_directive(line: &str) -> bool {
+    if !line.starts_with('!') {
+        return false;
+    }
+    // Pattern: !Word[...]{ optional whitespace }
+    // Match: starts with !, has word chars, brackets, then { } with optional whitespace
+    let rest = &line[1..];
+    let Some(bracket_start) = rest.find('[') else {
+        return false;
+    };
+    // Must have word chars before bracket
+    if bracket_start == 0
+        || !rest[..bracket_start]
+            .chars()
+            .all(|c| c.is_alphanumeric() || c == '_')
+    {
+        return false;
+    }
+    let Some(bracket_end) = rest.find(']') else {
+        return false;
+    };
+    if bracket_end <= bracket_start {
+        return false;
+    }
+    let after_bracket = rest[bracket_end + 1..].trim();
+    // Must end with {}
+    if after_bracket == "{}" {
+        return true;
+    }
+    // Or { } with whitespace
+    if after_bracket.starts_with('{') && after_bracket.ends_with('}') {
+        let inner = &after_bracket[1..after_bracket.len() - 1];
+        return inner.trim().is_empty();
+    }
+    false
+}
+
+/// Close the top node on the stack, attaching it to its parent or to top-level.
+fn close_node(stack: &mut Vec<ConfigNode>, top_level: &mut Vec<ConfigNode>) {
+    if let Some(closed) = stack.pop() {
+        if let Some(parent) = stack.last_mut() {
+            parent.children.push(closed);
+        } else {
+            top_level.push(closed);
+        }
+    }
+}
+
+/// Process a single logical line fragment (after comment stripping).
+///
+/// This is factored out so that content remaining after an opening `{`
+/// on the same physical line can be recursively processed.
+fn process_fragment(
+    line: &str,
+    stack: &mut Vec<ConfigNode>,
+    top_level: &mut Vec<ConfigNode>,
+    pending_name: &mut Option<String>,
+) {
+    let line = line.trim();
+    if line.is_empty() {
+        return;
+    }
+
+    // Inline delete directive
+    if is_delete_directive(line) {
+        return;
+    }
+
+    // Closing brace
+    if line == "}" {
+        if stack.is_empty() {
+            eprintln!("parser warning: unmatched closing brace, ignoring");
+            return;
+        }
+        close_node(stack, top_level);
+        return;
+    }
+
+    // Opening brace alone
+    if line == "{" {
+        let name = pending_name.take().unwrap_or_default();
+        stack.push(ConfigNode::new(name));
+        return;
+    }
+
+    // Line contains `{`
+    if line.contains('{') {
+        let brace_idx = line.find('{').unwrap();
+        let before = line[..brace_idx].trim();
+        let node_name = if before.is_empty() {
+            pending_name.take().unwrap_or_default()
+        } else {
+            *pending_name = None;
+            clean_node_name(before)
+        };
+        let node = ConfigNode::new(node_name);
+        let after = line[brace_idx + 1..].trim();
+        if after.starts_with('}') {
+            // Empty inline node like `Node {}`
+            if let Some(parent) = stack.last_mut() {
+                parent.children.push(node);
+            } else {
+                top_level.push(node);
+            }
+            return;
+        }
+        stack.push(node);
+        // Process remaining content after `{` on the same line
+        if !after.is_empty() {
+            process_fragment(after, stack, top_level, pending_name);
+        }
+        return;
+    }
+
+    // Check for trailing `}` on a key=value line or bare line
+    if line.contains('=') {
+        if pending_name.is_some() {
+            eprintln!("parser warning: discarding pending name before key=value line");
+            *pending_name = None;
+        }
+
+        // Check if line ends with `}` (inline close after key=value)
+        let (kv_part, has_close) = if let Some(stripped) = line.strip_suffix('}') {
+            (stripped, true)
+        } else {
+            (line, false)
+        };
+
+        let eq_idx = kv_part.find('=').unwrap();
+        let key = kv_part[..eq_idx].trim().to_string();
+        let value = kv_part[eq_idx + 1..].trim().to_string();
+        if let Some(current) = stack.last_mut() {
+            current.values.push((key, value));
+        }
+
+        if has_close {
+            close_node(stack, top_level);
+        }
+        return;
+    }
+
+    // Check if a bare token ends with `}` (edge case)
+    if let Some(stripped) = line.strip_suffix('}') {
+        let before = stripped.trim();
+        if !before.is_empty() {
+            if pending_name.is_some() {
+                eprintln!("parser warning: discarding previous pending name");
+            }
+            *pending_name = Some(clean_node_name(before));
+        }
+        close_node(stack, top_level);
+        return;
+    }
+
+    // Bare identifier (potential node name for next `{`)
+    if pending_name.is_some() {
+        eprintln!("parser warning: discarding previous pending name");
+    }
+    *pending_name = Some(clean_node_name(line));
+}
+
+/// Parse raw KSP ConfigNode text into a list of top-level nodes.
+///
+/// Handles comments, modifiers, delete directives, nested braces,
+/// and auto-closes unclosed nodes at EOF with a warning.
+///
+/// KSP ConfigNodeテキストをパースしてノードツリーを返す。
+pub fn parse_config_text(source: &str) -> Vec<ConfigNode> {
+    let mut top_level: Vec<ConfigNode> = Vec::new();
+    let mut stack: Vec<ConfigNode> = Vec::new();
+    let mut pending_name: Option<String> = None;
+
+    for raw_line in source.lines() {
+        let line = strip_comments(raw_line);
+        if line.is_empty() {
+            continue;
+        }
+        process_fragment(line, &mut stack, &mut top_level, &mut pending_name);
+    }
+
+    // Auto-close unclosed nodes
+    if !stack.is_empty() {
+        eprintln!(
+            "parser warning: {} unclosed node(s) at EOF, auto-closing",
+            stack.len()
+        );
+        while !stack.is_empty() {
+            close_node(&mut stack, &mut top_level);
+        }
+    }
+
+    top_level
+}
+
+// ---------------------------------------------------------------------------
+// Helper parsers
+// ---------------------------------------------------------------------------
+
+/// Parse a float from a string, returning `default` on `None` or parse failure.
+fn parse_float(value: Option<&str>, default: f64) -> f64 {
+    match value {
+        Some(s) => s.trim().parse::<f64>().unwrap_or(default),
+        None => default,
+    }
+}
+
+/// Parse a boolean from a string ("true" / "True" / "TRUE"), returning `default`
+/// on `None` or unrecognized input.
+fn parse_bool(value: Option<&str>, default: bool) -> bool {
+    match value {
+        Some(s) => s.trim().eq_ignore_ascii_case("true"),
+        None => default,
+    }
+}
+
+/// Parse a single curve key line: `position value [inTangent [outTangent]]`.
+///
+/// outTangent defaults to inTangent when omitted; both default to 0.
+fn parse_curve_key(raw_value: &str) -> Option<CurveKey> {
+    let parts: Vec<&str> = raw_value.split_whitespace().collect();
+    if parts.len() < 2 {
+        return None;
+    }
+    let position = parts[0].parse::<f64>().ok()?;
+    let value = parts[1].parse::<f64>().ok()?;
+    let in_tangent = if parts.len() >= 3 {
+        parts[2].parse::<f64>().unwrap_or(0.0)
+    } else {
+        0.0
+    };
+    let out_tangent = if parts.len() >= 4 {
+        parts[3].parse::<f64>().unwrap_or(in_tangent)
+    } else {
+        in_tangent
+    };
+    Some(CurveKey {
+        position,
+        value,
+        in_tangent,
+        out_tangent,
+    })
+}
+
+/// Extract sorted curve keys from a node's `key` values.
+fn extract_curve_keys(node: &ConfigNode) -> Vec<CurveKey> {
+    let mut keys: Vec<CurveKey> = node
+        .get_values("key")
+        .iter()
+        .filter_map(|raw| parse_curve_key(raw))
+        .collect();
+    keys.sort_by(|a, b| {
+        a.position
+            .partial_cmp(&b.position)
+            .unwrap_or(std::cmp::Ordering::Equal)
+    });
+    keys
+}
+
+// ---------------------------------------------------------------------------
+// Body extraction
+// ---------------------------------------------------------------------------
+
+/// Extract an `Atmosphere` from a body node, if present and enabled.
+fn extract_atmosphere(body_node: &ConfigNode) -> Option<Atmosphere> {
+    let atmo_node = body_node.get_child("Atmosphere")?;
+    let enabled = parse_bool(atmo_node.get_value("enabled"), false);
+    if !enabled {
+        return None;
+    }
+
+    let altitude = parse_float(atmo_node.get_value("altitude"), 0.0);
+    let adiabatic_index = parse_float(atmo_node.get_value("adiabaticIndex"), 1.4);
+    let molar_mass = parse_float(atmo_node.get_value("atmosphereMolarMass"), 0.02897);
+    let temperature_sea_level = parse_float(atmo_node.get_value("temperatureSeaLevel"), 0.0);
+    let pressure_sea_level = parse_float(atmo_node.get_value("staticPressureASL"), 0.0);
+
+    let temperature_curve = atmo_node
+        .get_child("temperatureCurve")
+        .map(extract_curve_keys)
+        .unwrap_or_default();
+    let pressure_curve = atmo_node
+        .get_child("pressureCurve")
+        .map(extract_curve_keys)
+        .unwrap_or_default();
+
+    Some(Atmosphere {
+        atmosphere_depth: altitude,
+        pressure_curve,
+        temperature_curve,
+        molar_mass,
+        adiabatic_index,
+        pressure_at_sea_level: pressure_sea_level,
+        temperature_at_sea_level: temperature_sea_level,
+    })
+}
+
+/// Extract `OrbitalElements` from a body node, if present.
+fn extract_orbit(body_node: &ConfigNode) -> Option<OrbitalElements> {
+    let orbit_node = body_node.get_child("Orbit")?;
+    Some(OrbitalElements {
+        semi_major_axis: parse_float(orbit_node.get_value("semiMajorAxis"), 0.0),
+        eccentricity: parse_float(orbit_node.get_value("eccentricity"), 0.0),
+        inclination: parse_float(orbit_node.get_value("inclination"), 0.0),
+        argument_of_periapsis: parse_float(orbit_node.get_value("argumentOfPeriapsis"), 0.0),
+        longitude_of_ascending_node: parse_float(
+            orbit_node.get_value("longitudeOfAscendingNode"),
+            0.0,
+        ),
+        mean_anomaly_at_epoch: parse_float(orbit_node.get_value("meanAnomalyAtEpoch"), 0.0),
+        epoch: parse_float(orbit_node.get_value("epoch"), 0.0),
+    })
+}
+
+/// Check if an Ocean child node exists and has `ocean = True`.
+fn extract_has_ocean(body_node: &ConfigNode) -> bool {
+    match body_node.get_child("Ocean") {
+        Some(ocean_node) => parse_bool(ocean_node.get_value("ocean"), false),
+        None => false,
+    }
+}
+
+/// Resolve display name: prefer Properties/displayName unless it starts with
+/// `#LOC_`, in which case fall back to source_filename then body name.
+fn resolve_display_name(
+    properties: Option<&ConfigNode>,
+    body_name: &str,
+    source_filename: &str,
+) -> String {
+    let fallback = || -> String {
+        if source_filename.is_empty() {
+            body_name.to_string()
+        } else {
+            source_filename.to_string()
+        }
+    };
+
+    let Some(props) = properties else {
+        return fallback();
+    };
+
+    match props.get_value("displayName") {
+        Some(dn) if !dn.starts_with("#LOC_") => dn.to_string(),
+        _ => fallback(),
+    }
+}
+
+/// Extract a single `CelestialBody` from a Body ConfigNode.
+fn extract_body(body_node: &ConfigNode, source_filename: &str) -> Option<CelestialBody> {
+    let name = body_node.get_value("name")?;
+    let properties = body_node.get_child("Properties");
+
+    let radius = parse_float(properties.and_then(|p| p.get_value("radius")), 600_000.0);
+    let gee_asl = parse_float(properties.and_then(|p| p.get_value("geeASL")), 1.0);
+    let rotational_period =
+        parse_float(properties.and_then(|p| p.get_value("rotationPeriod")), 0.0);
+    let display_name = resolve_display_name(properties, name, source_filename);
+    let is_home_world = parse_bool(properties.and_then(|p| p.get_value("isHomeWorld")), false);
+
+    let reference_body_name = body_node
+        .get_child("Orbit")
+        .and_then(|o| o.get_value("referenceBody"))
+        .map(|s| s.trim().to_string())
+        .unwrap_or_default();
+
+    let atmosphere = extract_atmosphere(body_node);
+    let orbit = extract_orbit(body_node);
+    let has_ocean = extract_has_ocean(body_node);
+
+    let mut body = CelestialBody::new(
+        name.to_string(),
+        radius,
+        gee_asl,
+        has_ocean,
+        atmosphere,
+        orbit,
+        rotational_period,
+        display_name,
+    );
+    body.is_home_world = is_home_world;
+    body.reference_body_name = reference_body_name;
+
+    Some(body)
+}
+
+/// Recursively walk nodes looking for `Body` children and extract them.
+fn walk_bodies(nodes: &[ConfigNode], source_filename: &str, bodies: &mut Vec<CelestialBody>) {
+    for node in nodes {
+        if node.name == "Body" {
+            if let Some(body) = extract_body(node, source_filename) {
+                bodies.push(body);
+            }
+        } else {
+            walk_bodies(&node.children, source_filename, bodies);
+        }
+    }
+}
+
+/// Parse KSP ConfigNode source text and extract all `CelestialBody` instances.
+///
+/// This is the main entry point for the parser.
+///
+/// メインエントリーポイント。天体を抽出して返す。
+pub fn parse_bodies(source: &str) -> Vec<CelestialBody> {
+    parse_bodies_with_filename(source, "")
+}
+
+/// Parse bodies with a source filename used as display name fallback.
+///
+/// ファイル名付きでパースする。
+pub fn parse_bodies_with_filename(source: &str, filename: &str) -> Vec<CelestialBody> {
+    let top_nodes = parse_config_text(source);
+    let mut bodies = Vec::new();
+    walk_bodies(&top_nodes, filename, &mut bodies);
+    bodies
+}
+
+// ---------------------------------------------------------------------------
+// Tests
+// ---------------------------------------------------------------------------
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    // -----------------------------------------------------------------------
+    // ConfigNode low-level tests
+    // -----------------------------------------------------------------------
+
+    #[test]
+    fn test_empty_input() {
+        assert!(parse_config_text("").is_empty());
+    }
+
+    #[test]
+    fn test_simple_key_value() {
+        let nodes = parse_config_text("Node\n{\n    name = Kerbin\n    radius = 600000\n}");
+        assert_eq!(nodes.len(), 1);
+        assert_eq!(nodes[0].name, "Node");
+        assert_eq!(nodes[0].get_value("name"), Some("Kerbin"));
+        assert_eq!(nodes[0].get_value("radius"), Some("600000"));
+    }
+
+    #[test]
+    fn test_nested_nodes() {
+        let nodes = parse_config_text(
+            "Outer\n{\n    key = val\n    Inner\n    {\n        key = val2\n    }\n}",
+        );
+        assert_eq!(nodes.len(), 1);
+        assert_eq!(nodes[0].children.len(), 1);
+        assert_eq!(nodes[0].children[0].name, "Inner");
+    }
+
+    #[test]
+    fn test_comment_removal() {
+        let nodes = parse_config_text("Node\n{\n    key = val // comment\n}");
+        assert_eq!(nodes[0].get_value("key"), Some("val"));
+    }
+
+    #[test]
+    fn test_modifier_stripping() {
+        for prefix in ["@", "!", "+", "-", "%"] {
+            let source = format!("{}Node\n{{\n    key = val\n}}", prefix);
+            let nodes = parse_config_text(&source);
+            assert_eq!(nodes[0].name, "Node", "failed for prefix {}", prefix);
+        }
+    }
+
+    #[test]
+    fn test_delete_directive_skipped() {
+        let nodes = parse_config_text("!Body[Kerbin]{}\nNode\n{\n    key = val\n}");
+        assert!(nodes.iter().any(|n| n.name == "Node"));
+        // The delete directive should not produce a node
+        assert!(!nodes.iter().any(|n| n.name == "Body"));
+    }
+
+    #[test]
+    fn test_unclosed_brace_no_crash() {
+        let result = parse_config_text("Node\n{\n    key = val\n");
+        assert!(!result.is_empty());
+        assert_eq!(result[0].get_value("key"), Some("val"));
+    }
+
+    #[test]
+    fn test_values_with_spaces() {
+        let nodes = parse_config_text("Node\n{\n    name = North Pole\n}");
+        assert_eq!(nodes[0].get_value("name"), Some("North Pole"));
+    }
+
+    #[test]
+    fn test_inline_node_opening() {
+        // Node name on the same line as the opening brace
+        let nodes = parse_config_text("Properties {\n    radius = 100000\n}");
+        assert_eq!(nodes.len(), 1);
+        assert_eq!(nodes[0].name, "Properties");
+        assert_eq!(nodes[0].get_value("radius"), Some("100000"));
+    }
+
+    #[test]
+    fn test_mm_annotation_stripped() {
+        let nodes = parse_config_text("@Kopernicus:AFTER[Kopernicus]\n{\n    key = val\n}");
+        assert_eq!(nodes[0].name, "Kopernicus");
+    }
+
+    #[test]
+    fn test_get_values_multiple() {
+        let nodes =
+            parse_config_text("Curve\n{\n    key = 0 100\n    key = 1 200\n    key = 2 300\n}");
+        let vals = nodes[0].get_values("key");
+        assert_eq!(vals.len(), 3);
+    }
+
+    #[test]
+    fn test_get_child_not_found() {
+        let nodes = parse_config_text("Node\n{\n    key = val\n}");
+        assert!(nodes[0].get_child("Missing").is_none());
+    }
+
+    // -----------------------------------------------------------------------
+    // Curve key parsing
+    // -----------------------------------------------------------------------
+
+    #[test]
+    fn test_curve_key_full() {
+        let ck = parse_curve_key("0 101.325 -0.005 -0.01").unwrap();
+        assert!((ck.position - 0.0).abs() < 1e-6);
+        assert!((ck.value - 101.325).abs() < 1e-6);
+        assert!((ck.in_tangent - (-0.005)).abs() < 1e-6);
+        assert!((ck.out_tangent - (-0.01)).abs() < 1e-6);
+    }
+
+    #[test]
+    fn test_curve_key_out_tangent_defaults_to_in() {
+        let ck = parse_curve_key("0 101.325 -0.005").unwrap();
+        assert!((ck.out_tangent - (-0.005)).abs() < 1e-6);
+    }
+
+    #[test]
+    fn test_curve_key_tangents_default_to_zero() {
+        let ck = parse_curve_key("0 101.325").unwrap();
+        assert!((ck.in_tangent - 0.0).abs() < 1e-6);
+        assert!((ck.out_tangent - 0.0).abs() < 1e-6);
+    }
+
+    #[test]
+    fn test_curve_key_too_few_parts() {
+        assert!(parse_curve_key("0").is_none());
+        assert!(parse_curve_key("").is_none());
+    }
+
+    // -----------------------------------------------------------------------
+    // Body extraction tests
+    // -----------------------------------------------------------------------
+
+    #[test]
+    fn test_parse_simple_body() {
+        let cfg = r#"
+        @Kopernicus:AFTER[Kopernicus]
+        {
+            Body
+            {
+                name = Kerbin
+                Properties
+                {
+                    radius = 600000
+                    geeASL = 1.0
+                    rotationPeriod = 21549.425
+                    isHomeWorld = True
+                }
+            }
+        }
+        "#;
+        let bodies = parse_bodies(cfg);
+        assert_eq!(bodies.len(), 1);
+        assert_eq!(bodies[0].name, "Kerbin");
+        assert!((bodies[0].radius - 600_000.0).abs() < 1.0);
+        assert!((bodies[0].gee_asl - 1.0).abs() < 0.001);
+        assert!(bodies[0].is_home_world);
+    }
+
+    #[test]
+    fn test_parse_sanctar_cfg() {
+        let cfg = std::fs::read_to_string("../../../sample_configs/Sanctar.cfg").unwrap();
+        let bodies = parse_bodies(&cfg);
+        assert!(!bodies.is_empty());
+        let body = &bodies[0];
+
+        // Basic properties
+        assert!((body.radius - 670_000.0).abs() < 1.0);
+        assert!((body.gee_asl - 1.1).abs() < 0.001);
+
+        // Atmosphere
+        assert!(body.atmosphere.is_some());
+        let atmo = body.atmosphere.as_ref().unwrap();
+        assert!((atmo.atmosphere_depth - 72_000.0).abs() < 1.0);
+        assert_eq!(atmo.pressure_curve.len(), 26);
+        assert_eq!(atmo.temperature_curve.len(), 26);
+        assert!((atmo.pressure_at_sea_level - 110.444).abs() / 110.444 < 0.001);
+        assert!((atmo.temperature_at_sea_level - 281.0).abs() < 0.1);
+        assert!((atmo.molar_mass - 0.02897).abs() < 0.0001);
+        assert!((atmo.adiabatic_index - 1.4).abs() < 0.001);
+
+        // Orbit
+        assert!(body.orbit.is_some());
+        let orbit = body.orbit.as_ref().unwrap();
+        assert!((orbit.semi_major_axis - 13_116_000_574.0).abs() / 13_116_000_574.0 < 0.001);
+        assert!((orbit.eccentricity - 0.0254528).abs() < 0.001);
+        assert!((orbit.inclination - 1.38).abs() < 0.01);
+
+        // Other
+        assert!(body.is_home_world);
+        assert_eq!(body.reference_body_name, "Sun");
+        assert!(body.has_ocean);
+    }
+
+    #[test]
+    fn test_curve_key_out_tangent_defaults_to_in_body() {
+        let cfg = r#"
+        Body
+        {
+            name = Test
+            Properties { radius = 100000 }
+            Atmosphere
+            {
+                enabled = True
+                altitude = 50000
+                adiabaticIndex = 1.4
+                atmosphereMolarMass = 0.029
+                temperatureSeaLevel = 288
+                staticPressureASL = 101.325
+                pressureCurve
+                {
+                    key = 0 101.325 -0.005
+                }
+                temperatureCurve
+                {
+                    key = 0 288 0 0
+                }
+            }
+        }
+        "#;
+        let bodies = parse_bodies(cfg);
+        let atmo = bodies[0].atmosphere.as_ref().unwrap();
+        assert!((atmo.pressure_curve[0].out_tangent - (-0.005)).abs() < 1e-6);
+    }
+
+    #[test]
+    fn test_atmosphere_disabled_is_none() {
+        let cfg = "Body\n{\n    name = Test\n    Properties\n    {\n        radius = 100000\n        geeASL = 1.0\n    }\n    Atmosphere\n    {\n        enabled = False\n        altitude = 70000\n    }\n}";
+        let bodies = parse_bodies(cfg);
+        assert!(bodies[0].atmosphere.is_none());
+    }
+
+    #[test]
+    fn test_no_orbit_is_none() {
+        let cfg = "Body\n{\n    name = Test\n    Properties\n    {\n        radius = 100000\n        geeASL = 1.0\n    }\n}";
+        let bodies = parse_bodies(cfg);
+        assert!(bodies[0].orbit.is_none());
+    }
+
+    #[test]
+    fn test_reference_body_from_orbit() {
+        let cfg = "Body\n{\n    name = Test\n    Properties\n    {\n        radius = 100000\n        geeASL = 1.0\n    }\n    Orbit\n    {\n        semiMajorAxis = 1000000\n        referenceBody = Sun\n    }\n}";
+        let bodies = parse_bodies(cfg);
+        assert_eq!(bodies[0].reference_body_name, "Sun");
+    }
+
+    #[test]
+    fn test_multiple_bodies() {
+        let cfg = "Body\n{\n    name = A\n    Properties { radius = 100000\n geeASL = 1.0 }\n}\nBody\n{\n    name = B\n    Properties { radius = 200000\n geeASL = 0.8 }\n}";
+        let bodies = parse_bodies(cfg);
+        assert_eq!(bodies.len(), 2);
+    }
+
+    #[test]
+    fn test_display_name_loc_fallback() {
+        let cfg = r#"
+        Body
+        {
+            name = Kerbin
+            Properties
+            {
+                displayName = #LOC_Kerbin
+                radius = 600000
+            }
+        }
+        "#;
+        // Without filename, falls back to body name
+        let bodies = parse_bodies(cfg);
+        assert_eq!(bodies[0].display_name, "Kerbin");
+
+        // With filename, falls back to filename
+        let bodies = parse_bodies_with_filename(cfg, "MyPlanet");
+        assert_eq!(bodies[0].display_name, "MyPlanet");
+    }
+
+    #[test]
+    fn test_display_name_real_value() {
+        let cfg = r#"
+        Body
+        {
+            name = Kerbin
+            Properties
+            {
+                displayName = Earth
+                radius = 600000
+            }
+        }
+        "#;
+        let bodies = parse_bodies(cfg);
+        assert_eq!(bodies[0].display_name, "Earth");
+    }
+
+    #[test]
+    fn test_no_properties_defaults() {
+        let cfg = "Body\n{\n    name = Test\n}";
+        let bodies = parse_bodies(cfg);
+        assert_eq!(bodies.len(), 1);
+        assert!((bodies[0].radius - 600_000.0).abs() < 1.0);
+        assert!((bodies[0].gee_asl - 1.0).abs() < 0.001);
+    }
+
+    #[test]
+    fn test_body_without_name_skipped() {
+        let cfg = "Body\n{\n    Properties { radius = 100000 }\n}";
+        let bodies = parse_bodies(cfg);
+        assert!(bodies.is_empty());
+    }
+
+    #[test]
+    fn test_unmatched_closing_brace() {
+        // Should not crash
+        let nodes = parse_config_text("}\nNode\n{\n    key = val\n}");
+        assert_eq!(nodes.len(), 1);
+        assert_eq!(nodes[0].name, "Node");
+    }
+
+    #[test]
+    fn test_delete_directive_with_spaces() {
+        let nodes = parse_config_text("!Body[Kerbin]{ }\nNode\n{\n    key = val\n}");
+        assert!(nodes.iter().any(|n| n.name == "Node"));
+        assert!(!nodes.iter().any(|n| n.name == "Body"));
+    }
+}

From 995178339ef8476aa2fff8997cd97a4802e5e370 Mon Sep 17 00:00:00 2001
From: Yumeno Yuuka <sounyan.is.the.angel@gmail.com>
Date: Fri, 3 Apr 2026 09:39:27 +0900
Subject: [PATCH 3/8] feat(rust): implement delta-V calculation engine

Port all calculator functions from Python kopdeltav/calculator.py to Rust:
- Orbital mechanics: low_orbit_altitude, circular/escape velocity
- Atmospheric density via hermite-interpolated curves (kPa->Pa conversion)
- Launch delta-V with empirical gravity/drag/jet estimation
- Hohmann transfer (inward + outward) via vis-viva equation
- Tsiolkovsky rocket equation for mass ratio
- Geostationary orbit altitude and transfer delta-V
- Escape/landing delta-V helpers
- Multi-step route planner (compute_route)

All 17 tests pass including reference value regression tests:
- Sanctar escape velocity: 3802 m/s
- Kerbin escape velocity: 3431 m/s
- Sanctar surface density: 1.4096 kg/m3
- Sanctar launch rocket: ~3110 m/s, with jets: ~1982 m/s
---
 src-tauri/crates/kopdeltav/src/calculator.rs | 1107 ++++++++++++++++++
 src-tauri/crates/kopdeltav/src/lib.rs        |    1 +
 2 files changed, 1108 insertions(+)
 create mode 100644 src-tauri/crates/kopdeltav/src/calculator.rs

diff --git a/src-tauri/crates/kopdeltav/src/calculator.rs b/src-tauri/crates/kopdeltav/src/calculator.rs
new file mode 100644
index 0000000..745095e
--- /dev/null
+++ b/src-tauri/crates/kopdeltav/src/calculator.rs
@@ -0,0 +1,1107 @@
+//! Delta-V calculation engine for KSP celestial bodies.
+//!
+//! 天体のΔV計算エンジン。低軌道投入、ホーマン遷移、ツィオルコフスキー方程式を提供する。
+//!
+//! Provides empirical launch-to-orbit estimation, Hohmann transfer computation,
+//! Tsiolkovsky rocket equation, geostationary orbit calculation, escape/landing
+//! ΔV helpers, and a multi-step route planner.
+
+use serde::Serialize;
+use std::f64::consts::PI;
+
+use crate::models::{hermite_interp, CelestialBody, G0, R_GAS};
+
+// ---------------------------------------------------------------------------
+// Constants
+// ---------------------------------------------------------------------------
+
+/// Fraction of orbital velocity attributed to gravity loss, scaled by surface gravity.
+/// Calibrated against KSP flight data; accuracy ~10%.
+const GRAVITY_LOSS_COEFF: f64 = 0.15;
+
+/// Fraction of orbital velocity attributed to atmospheric drag loss,
+/// scaled by surface density relative to Earth.
+const DRAG_LOSS_COEFF: f64 = 0.05;
+
+/// Fraction of orbital velocity saved by air-breathing (jet) engines in the lower atmosphere.
+/// Capped when density ratio >= 1.0.
+const JET_SAVINGS_COEFF: f64 = 0.44;
+
+/// Earth sea-level atmospheric density [kg/m^3], used as reference for empirical scaling.
+const EARTH_RHO_SEA_LEVEL: f64 = 1.225;
+
+// ---------------------------------------------------------------------------
+// Enums
+// ---------------------------------------------------------------------------
+
+/// Type of a delta-V route segment, used for display coloring.
+///
+/// ΔVルートセグメントの種別。表示時の色分けに使用。
+#[derive(Debug, Clone, Serialize)]
+pub enum SegmentType {
+    /// Launch from surface to low orbit.
+    Launch,
+    /// Escape from a celestial body's gravity well.
+    Escape,
+    /// Interplanetary/interlunar Hohmann transfer.
+    Transfer,
+    /// Orbit insertion (capture burn) at destination.
+    Capture,
+    /// Landing on a celestial body.
+    Landing,
+    /// Escape from the entire star system (third cosmic velocity).
+    SystemEscape,
+    /// Transfer from a planet's orbit to a moon's orbit.
+    MoonTransfer,
+    /// Landing on a moon.
+    MoonLanding,
+}
+
+// ---------------------------------------------------------------------------
+// Result structs
+// ---------------------------------------------------------------------------
+
+/// Results of a launch-to-orbit delta-V calculation.
+///
+/// 低軌道投入ΔV計算の結果。
+#[derive(Debug, Clone, Serialize)]
+pub struct LaunchResult {
+    /// Circular velocity at target orbit [m/s].
+    pub orbital_velocity: f64,
+    /// Estimated gravity loss [m/s].
+    pub gravity_loss: f64,
+    /// Estimated atmospheric drag loss [m/s].
+    pub drag_loss: f64,
+    /// Theoretical minimum (= orbital velocity) [m/s].
+    pub total_ideal: f64,
+    /// Practical rocket delta-V with losses [m/s].
+    pub total_rocket: f64,
+    /// Delta-V saved if using jet engines in lower atmosphere [m/s].
+    pub jet_savings: f64,
+    /// total_rocket - jet_savings [m/s].
+    pub total_with_jets: f64,
+}
+
+/// Results of a Hohmann transfer calculation.
+///
+/// ホーマン遷移計算の結果。
+#[derive(Debug, Clone, Serialize)]
+pub struct HohmannResult {
+    /// Delta-V for departure burn [m/s].
+    pub departure_dv: f64,
+    /// Delta-V for arrival/capture burn [m/s].
+    pub arrival_dv: f64,
+    /// Total delta-V (departure + arrival) [m/s].
+    pub total_dv: f64,
+    /// Transfer time (half-period of the transfer ellipse) [s].
+    pub transfer_time: f64,
+    /// True if the transfer is to an inner (lower) orbit.
+    pub inward: bool,
+}
+
+/// Results of the Tsiolkovsky rocket equation.
+///
+/// ツィオルコフスキーの式の計算結果。
+#[derive(Debug, Clone, Serialize)]
+pub struct TsiolkovskyResult {
+    /// Wet mass / dry mass ratio.
+    pub mass_ratio: f64,
+    /// Fraction of total mass that is fuel (1 - 1/mass_ratio).
+    pub fuel_fraction: f64,
+    /// Dry (empty) mass [kg].
+    pub dry_mass: f64,
+    /// Fuel mass [kg].
+    pub fuel_mass: f64,
+}
+
+/// A single step in a delta-V route.
+///
+/// ΔVルートの1ステップ。
+#[derive(Debug, Clone, Serialize)]
+pub struct DvStep {
+    /// Human-readable description of this maneuver.
+    pub label: String,
+    /// Delta-V for this step [m/s].
+    pub dv: f64,
+    /// Running total delta-V from mission start [m/s].
+    pub cumulative: f64,
+    /// Type of maneuver for display purposes.
+    pub segment_type: SegmentType,
+    /// Optional supplementary information (e.g. aerobrake alternative).
+    pub note: String,
+}
+
+// ---------------------------------------------------------------------------
+// Orbital mechanics
+// ---------------------------------------------------------------------------
+
+/// Estimate a reasonable low orbit altitude for the body.
+///
+/// 天体の妥当な低軌道高度を推定する。
+///
+/// For bodies with atmosphere, returns approximately 10% above the atmosphere
+/// depth to ensure a stable orbit well outside the atmosphere. For airless
+/// bodies, returns 5% of the body radius (minimum 10 000 m).
+///
+/// # Arguments
+/// * `body` - Target celestial body.
+///
+/// # Returns
+/// Estimated low orbit altitude above surface [m].
+pub fn low_orbit_altitude(body: &CelestialBody) -> f64 {
+    if let Some(ref atmo) = body.atmosphere {
+        atmo.atmosphere_depth * 1.1
+    } else {
+        f64::max(body.radius * 0.05, 10_000.0)
+    }
+}
+
+/// Circular orbital velocity at given altitude above surface.
+///
+/// 指定高度での円軌道速度を計算する。
+///
+/// Uses `v_circular = sqrt(mu / r)` where `r = radius + altitude`.
+///
+/// # Arguments
+/// * `body` - Target celestial body.
+/// * `altitude` - Altitude above surface [m].
+///
+/// # Returns
+/// Orbital velocity [m/s].
+///
+/// # Panics
+/// Panics if altitude is negative.
+pub fn circular_velocity(body: &CelestialBody, altitude: f64) -> f64 {
+    assert!(altitude >= 0.0, "Altitude must be non-negative: {altitude}");
+    let r = body.radius + altitude;
+    (body.mu / r).sqrt()
+}
+
+/// Escape velocity at given altitude above surface.
+///
+/// 指定高度での脱出速度を計算する。
+///
+/// Uses `v_escape = sqrt(2 * mu / r) = sqrt(2) * v_circular` at the same altitude.
+///
+/// # Arguments
+/// * `body` - Target celestial body.
+/// * `altitude` - Altitude above surface [m].
+///
+/// # Returns
+/// Escape velocity [m/s].
+///
+/// # Panics
+/// Panics if altitude is negative.
+pub fn escape_velocity(body: &CelestialBody, altitude: f64) -> f64 {
+    assert!(altitude >= 0.0, "Altitude must be non-negative: {altitude}");
+    let r = body.radius + altitude;
+    (2.0 * body.mu / r).sqrt()
+}
+
+// ---------------------------------------------------------------------------
+// Atmospheric density
+// ---------------------------------------------------------------------------
+
+/// Calculate atmospheric density at altitude using hermite-interpolated curves.
+///
+/// 高度ごとの大気密度をエルミート補間カーブで計算する。
+///
+/// Applies the ideal gas law `rho = P * M / (R_gas * T)` where pressure and
+/// temperature are obtained from the body's atmosphere curves via cubic
+/// Hermite spline interpolation. When curves are empty, falls back to
+/// sea-level scalar values (meaningful only at altitude 0).
+///
+/// **Important**: Pressure in the curves is in kPa; it must be converted to
+/// Pa (x1000) before applying the ideal gas law.
+///
+/// # Arguments
+/// * `body` - Target celestial body.
+/// * `altitude` - Altitude above surface [m].
+///
+/// # Returns
+/// Atmospheric density [kg/m^3], or `None` if the body has no atmosphere.
+/// Returns `0.0` for altitudes at or above the atmosphere depth.
+pub fn density_at_altitude(body: &CelestialBody, altitude: f64) -> Option<f64> {
+    let atmo = body.atmosphere.as_ref()?;
+
+    if altitude >= atmo.atmosphere_depth {
+        return Some(0.0);
+    }
+
+    // Pressure [kPa] from curve, falling back to sea-level scalar.
+    let pressure_kpa = if !atmo.pressure_curve.is_empty() {
+        hermite_interp(&atmo.pressure_curve, altitude).unwrap_or(0.0)
+    } else if altitude == 0.0 {
+        atmo.pressure_at_sea_level
+    } else {
+        0.0
+    };
+
+    // Temperature [K] from curve, falling back to sea-level scalar.
+    let temperature_k = if !atmo.temperature_curve.is_empty() {
+        hermite_interp(&atmo.temperature_curve, altitude).unwrap_or(0.0)
+    } else if altitude == 0.0 {
+        atmo.temperature_at_sea_level
+    } else {
+        0.0
+    };
+
+    if temperature_k <= 0.0 || pressure_kpa <= 0.0 {
+        return Some(0.0);
+    }
+
+    // kPa -> Pa conversion, then ideal gas law: rho = P * M / (R * T).
+    let pressure_pa = pressure_kpa * 1000.0;
+    Some(pressure_pa * atmo.molar_mass / (R_GAS * temperature_k))
+}
+
+/// Calculate sea-level atmospheric density using the ideal gas law.
+///
+/// 海面大気密度を理想気体の式で計算する。大気なしの場合は None。
+///
+/// Delegates to [`density_at_altitude`] at altitude 0, which evaluates
+/// the pressure and temperature curves at sea level.
+///
+/// # Arguments
+/// * `body` - Target celestial body.
+///
+/// # Returns
+/// Sea-level atmospheric density [kg/m^3], or `None` if no atmosphere.
+pub fn surface_density(body: &CelestialBody) -> Option<f64> {
+    density_at_altitude(body, 0.0)
+}
+
+// ---------------------------------------------------------------------------
+// Launch delta-V
+// ---------------------------------------------------------------------------
+
+/// Calculate launch-to-orbit delta-V for a body.
+///
+/// 天体の低軌道投入ΔVを計算する。
+///
+/// This is an **empirical** model. All loss and savings values are rough
+/// approximations calibrated against KSP flight data. Estimated accuracy
+/// is +/-10% for `total_rocket` and +/-15% for `jet_savings`. Actual values
+/// depend heavily on vehicle design, thrust-to-weight ratio, and ascent profile.
+///
+/// Assumptions:
+/// - **Gravity loss** ~ 15% of orbital velocity, scaled linearly by `gee_asl`.
+/// - **Drag loss** ~ 5% of orbital velocity, scaled by `rho/rho_earth`.
+/// - **Jet savings** ~ 44% of orbital velocity, capped at density ratio 1.0.
+///
+/// # Arguments
+/// * `body` - Target celestial body.
+/// * `target_altitude` - Target circular orbit altitude above surface [m].
+///
+/// # Returns
+/// [`LaunchResult`] with computed delta-V values.
+///
+/// # Panics
+/// Panics if `target_altitude` is negative.
+pub fn calculate_launch(body: &CelestialBody, target_altitude: f64) -> LaunchResult {
+    assert!(
+        target_altitude >= 0.0,
+        "Target altitude must be non-negative: {target_altitude}"
+    );
+
+    let v_orbital = circular_velocity(body, target_altitude);
+
+    // Gravity loss: scales with surface gravity.
+    let gravity_loss = v_orbital * GRAVITY_LOSS_COEFF * body.gee_asl;
+
+    // Drag loss: scales with atmospheric density relative to Earth.
+    let rho = surface_density(body);
+    let drag_loss = match rho {
+        Some(r) if r > 0.0 => v_orbital * DRAG_LOSS_COEFF * (r / EARTH_RHO_SEA_LEVEL),
+        _ => 0.0,
+    };
+
+    let total_ideal = v_orbital;
+    let total_rocket = v_orbital + gravity_loss + drag_loss;
+
+    // Jet savings: only possible with atmosphere; capped at density ratio 1.0.
+    let jet_savings = match rho {
+        Some(r) if r > 0.0 => {
+            let density_factor = (r / EARTH_RHO_SEA_LEVEL).min(1.0);
+            v_orbital * JET_SAVINGS_COEFF * density_factor
+        }
+        _ => 0.0,
+    };
+
+    let total_with_jets = total_rocket - jet_savings;
+
+    LaunchResult {
+        orbital_velocity: v_orbital,
+        gravity_loss,
+        drag_loss,
+        total_ideal,
+        total_rocket,
+        jet_savings,
+        total_with_jets,
+    }
+}
+
+// ---------------------------------------------------------------------------
+// Hohmann transfer
+// ---------------------------------------------------------------------------
+
+/// Calculate Hohmann transfer from parking orbit to target orbit.
+///
+/// パーキング軌道からターゲット軌道へのホーマン遷移ΔVを計算する。
+///
+/// Supports both outward (target > parking) and inward (target < parking)
+/// transfers. For inward transfers the vis-viva computation uses the
+/// swapped radii internally and the returned departure/arrival delta-Vs are
+/// swapped so that `departure_dv` is the burn at the parking orbit and
+/// `arrival_dv` is the burn at the target orbit.
+///
+/// Standard Hohmann transfer equations (outward case):
+/// ```text
+/// a_transfer = (r1 + r2) / 2
+/// v_transfer_peri = sqrt(mu * (2/r1 - 1/a_transfer))
+/// departure_dv = v_transfer_peri - v_circular(r1)
+/// v_transfer_apo  = sqrt(mu * (2/r2 - 1/a_transfer))
+/// arrival_dv = v_circular(r2) - v_transfer_apo
+/// transfer_time = pi * sqrt(a_transfer^3 / mu)
+/// ```
+///
+/// # Arguments
+/// * `body` - Central body being orbited.
+/// * `parking_altitude` - Altitude of circular parking orbit above surface [m].
+/// * `target_sma` - Semi-major axis of target orbit [m] (from body center).
+///
+/// # Returns
+/// [`HohmannResult`] with delta-V and transfer time values.
+///
+/// # Panics
+/// Panics if `parking_altitude` is negative or the parking orbit radius
+/// and `target_sma` are identical (zero-ΔV transfer).
+pub fn calculate_hohmann(
+    body: &CelestialBody,
+    parking_altitude: f64,
+    target_sma: f64,
+) -> HohmannResult {
+    assert!(
+        parking_altitude >= 0.0,
+        "Parking altitude must be non-negative: {parking_altitude}"
+    );
+
+    let r_parking = body.radius + parking_altitude;
+    let r_target = target_sma;
+
+    assert!(
+        (r_parking - r_target).abs() / r_parking.max(r_target) > 1e-12,
+        "Parking orbit radius ({r_parking} m) and target SMA ({r_target} m) \
+         are identical; Hohmann transfer is undefined"
+    );
+
+    let inward = r_target < r_parking;
+
+    // For vis-viva, r_inner is the periapsis and r_outer is the apoapsis.
+    let r_inner = r_parking.min(r_target);
+    let r_outer = r_parking.max(r_target);
+
+    let mu = body.mu;
+    let a_transfer = (r_inner + r_outer) / 2.0;
+
+    // Burn at periapsis of the transfer ellipse.
+    let v_inner_circular = (mu / r_inner).sqrt();
+    let v_transfer_peri = (mu * (2.0 / r_inner - 1.0 / a_transfer)).sqrt();
+    let dv_peri = v_transfer_peri - v_inner_circular;
+
+    // Burn at apoapsis of the transfer ellipse.
+    let v_outer_circular = (mu / r_outer).sqrt();
+    let v_transfer_apo = (mu * (2.0 / r_outer - 1.0 / a_transfer)).sqrt();
+    let dv_apo = v_outer_circular - v_transfer_apo;
+
+    // Transfer time: half the period of the transfer ellipse.
+    let transfer_time = PI * (a_transfer.powi(3) / mu).sqrt();
+
+    let (departure_dv, arrival_dv) = if inward {
+        // Inward: departure is at the outer (parking) orbit, arrival at inner.
+        (dv_apo, dv_peri)
+    } else {
+        // Outward: departure is at the inner (parking) orbit, arrival at outer.
+        (dv_peri, dv_apo)
+    };
+
+    HohmannResult {
+        departure_dv,
+        arrival_dv,
+        total_dv: departure_dv + arrival_dv,
+        transfer_time,
+        inward,
+    }
+}
+
+// ---------------------------------------------------------------------------
+// Tsiolkovsky rocket equation
+// ---------------------------------------------------------------------------
+
+/// Apply the Tsiolkovsky rocket equation.
+///
+/// ツィオルコフスキーの式を適用して質量比を計算する。
+///
+/// ```text
+/// dv = Isp * g0 * ln(m_wet / m_dry)
+/// mass_ratio = exp(dv / (Isp * g0))
+/// ```
+///
+/// # Arguments
+/// * `delta_v` - Required delta-V [m/s].
+/// * `isp` - Specific impulse [s].
+/// * `wet_mass` - Total (wet) mass [kg].
+///
+/// # Returns
+/// [`TsiolkovskyResult`] with mass ratio and fuel breakdown.
+///
+/// # Panics
+/// Panics if `delta_v` is negative, `isp` is non-positive, or
+/// `wet_mass` is non-positive.
+pub fn calculate_tsiolkovsky(delta_v: f64, isp: f64, wet_mass: f64) -> TsiolkovskyResult {
+    assert!(delta_v >= 0.0, "delta_v must be non-negative: {delta_v}");
+    assert!(isp > 0.0, "Isp must be positive: {isp}");
+    assert!(wet_mass > 0.0, "wet_mass must be positive: {wet_mass}");
+
+    let ve = isp * G0; // effective exhaust velocity [m/s]
+    let mass_ratio = (delta_v / ve).exp();
+    let fuel_fraction = 1.0 - 1.0 / mass_ratio;
+    let dry_mass = wet_mass / mass_ratio;
+    let fuel_mass = wet_mass - dry_mass;
+
+    TsiolkovskyResult {
+        mass_ratio,
+        fuel_fraction,
+        dry_mass,
+        fuel_mass,
+    }
+}
+
+// ---------------------------------------------------------------------------
+// Geostationary orbit
+// ---------------------------------------------------------------------------
+
+/// Calculate the altitude of a geostationary orbit.
+///
+/// 静止軌道の高度を計算する。
+///
+/// Uses the formula:
+/// ```text
+/// r_geo = (mu * T^2 / (4 * pi^2))^(1/3)
+/// altitude = r_geo - radius
+/// ```
+///
+/// where `T` is the sidereal rotation period of the body.
+///
+/// # Arguments
+/// * `body` - Target celestial body.
+///
+/// # Returns
+/// Geostationary orbit altitude above surface [m].
+///
+/// # Panics
+/// Panics if `body.rotational_period` is non-positive.
+pub fn geostationary_altitude(body: &CelestialBody) -> f64 {
+    assert!(
+        body.rotational_period > 0.0,
+        "Rotational period must be positive for a geostationary orbit: {}",
+        body.rotational_period
+    );
+    let t = body.rotational_period;
+    let r_geo = (body.mu * t * t / (4.0 * PI * PI)).powf(1.0 / 3.0);
+    r_geo - body.radius
+}
+
+/// Calculate the delta-V for a Hohmann transfer from low orbit to geostationary orbit.
+///
+/// 低軌道から静止軌道へのホーマン遷移ΔVを計算する。
+///
+/// # Arguments
+/// * `body` - Target celestial body.
+///
+/// # Returns
+/// [`HohmannResult`] for the low orbit -> geostationary transfer.
+///
+/// # Panics
+/// Panics if `body.rotational_period` is non-positive, or if the
+/// geostationary orbit is below the low orbit (extremely fast rotators).
+pub fn geostationary_dv(body: &CelestialBody) -> HohmannResult {
+    let lo_alt = low_orbit_altitude(body);
+    let geo_alt = geostationary_altitude(body);
+    let geo_sma = body.radius + geo_alt;
+    calculate_hohmann(body, lo_alt, geo_sma)
+}
+
+// ---------------------------------------------------------------------------
+// Escape delta-V from low orbit
+// ---------------------------------------------------------------------------
+
+/// Calculate the delta-V needed to escape from low orbit.
+///
+/// 低軌道から脱出するのに必要なΔVを計算する。
+///
+/// Computes `v_escape(lo_alt) - v_circular(lo_alt)`, which is the
+/// impulsive burn required to reach escape velocity from a circular
+/// parking orbit at the standard low orbit altitude.
+///
+/// # Arguments
+/// * `body` - Target celestial body.
+///
+/// # Returns
+/// Escape delta-V from low orbit [m/s]. Always positive.
+pub fn escape_dv_from_low_orbit(body: &CelestialBody) -> f64 {
+    let lo_alt = low_orbit_altitude(body);
+    let v_esc = escape_velocity(body, lo_alt);
+    let v_circ = circular_velocity(body, lo_alt);
+    v_esc - v_circ
+}
+
+// ---------------------------------------------------------------------------
+// Landing delta-V
+// ---------------------------------------------------------------------------
+
+/// Estimate the delta-V required to land on a body.
+///
+/// 天体への着陸に必要なΔVを推定する。
+///
+/// The powered landing delta-V is approximated as the circular orbital velocity
+/// at the low orbit altitude -- representing the speed that must be cancelled
+/// to descend from orbit to the surface.
+///
+/// For bodies **with** atmosphere, aerobraking can absorb most of the
+/// orbital energy; the aerobrake contribution is returned as `Some(0.0)`.
+///
+/// For bodies **without** atmosphere, there is no aerobraking option, so
+/// the second element is `None`.
+///
+/// # Arguments
+/// * `body` - Target celestial body.
+///
+/// # Returns
+/// A tuple `(powered_dv, aerobrake_dv)` where:
+/// - `powered_dv`: delta-V for a fully powered landing [m/s]. Always > 0.
+/// - `aerobrake_dv`: `Some(0.0)` if the body has atmosphere; `None` if no atmosphere.
+pub fn landing_dv(body: &CelestialBody) -> (f64, Option<f64>) {
+    let lo_alt = low_orbit_altitude(body);
+    let powered_dv = circular_velocity(body, lo_alt);
+    let aerobrake_dv = if body.atmosphere.is_some() {
+        Some(0.0)
+    } else {
+        None
+    };
+    (powered_dv, aerobrake_dv)
+}
+
+// ---------------------------------------------------------------------------
+// Delta-V route planner
+// ---------------------------------------------------------------------------
+
+/// Compute a delta-V route from the home world to an optional destination.
+///
+/// ホームワールドから目的地までのΔVルートを計算する。
+///
+/// Three modes depending on the arguments:
+///
+/// **Third cosmic velocity** (`destination = None`):
+///   1. Launch to low orbit.
+///   2. Escape home world.
+///   3. Escape star system.
+///
+/// **Planet flyby / capture** (`destination = Some(planet)`, `moon = None`):
+///   1. Launch to low orbit.
+///   2. Escape home world.
+///   3. Hohmann transfer in parent body's frame.
+///   4. Destination orbit insertion (capture burn).
+///   5. Landing on destination.
+///
+/// **Moon mission** (`destination = Some(planet)`, `moon = Some(satellite)`):
+///   Steps 1-4 as above.
+///   5. Hohmann transfer from destination low orbit to moon SMA.
+///   6. Landing on moon.
+///
+/// # Arguments
+/// * `home` - Home world celestial body (must have orbit and parent).
+/// * `parent` - Parent star/body that home orbits.
+/// * `destination` - Target planet (must orbit the same parent as home). Pass `None` for third cosmic velocity.
+/// * `moon` - Target moon orbiting destination. Ignored when destination is `None`.
+///
+/// # Returns
+/// Ordered list of [`DvStep`] objects representing each maneuver.
+///
+/// # Panics
+/// Panics if home has no orbit data, or if destination/moon have no orbit data when provided.
+pub fn compute_route(
+    home: &CelestialBody,
+    parent: &CelestialBody,
+    destination: Option<&CelestialBody>,
+    moon: Option<&CelestialBody>,
+) -> Vec<DvStep> {
+    let home_orbit = home
+        .orbit
+        .as_ref()
+        .expect("Home world has no orbital elements; cannot compute interplanetary route.");
+
+    let mut steps: Vec<DvStep> = Vec::new();
+    let mut cumulative = 0.0;
+
+    let add_step = |steps: &mut Vec<DvStep>,
+                    cumulative: &mut f64,
+                    label: String,
+                    dv: f64,
+                    seg_type: SegmentType,
+                    note: String| {
+        *cumulative += dv;
+        steps.push(DvStep {
+            label,
+            dv,
+            cumulative: *cumulative,
+            segment_type: seg_type,
+            note,
+        });
+    };
+
+    // Step 1: Launch to low orbit.
+    let lo_alt = low_orbit_altitude(home);
+    let launch = calculate_launch(home, lo_alt);
+    add_step(
+        &mut steps,
+        &mut cumulative,
+        "Launch to low orbit".to_string(),
+        launch.total_rocket,
+        SegmentType::Launch,
+        String::new(),
+    );
+
+    // Step 2: Escape home world.
+    let esc_home = escape_dv_from_low_orbit(home);
+    add_step(
+        &mut steps,
+        &mut cumulative,
+        format!("Escape {}", home.name),
+        esc_home,
+        SegmentType::Escape,
+        String::new(),
+    );
+
+    let destination = match destination {
+        Some(d) => d,
+        None => {
+            // Third cosmic velocity: escape the parent star system from home orbit.
+            let home_sma = home_orbit.semi_major_axis;
+            let home_orbit_alt = home_sma - parent.radius;
+            let v_esc_star = escape_velocity(parent, home_orbit_alt);
+            let v_circ_star = circular_velocity(parent, home_orbit_alt);
+            let esc_star = v_esc_star - v_circ_star;
+            add_step(
+                &mut steps,
+                &mut cumulative,
+                format!("Escape {} system", parent.name),
+                esc_star,
+                SegmentType::SystemEscape,
+                String::new(),
+            );
+            return steps;
+        }
+    };
+
+    let dest_orbit = destination
+        .orbit
+        .as_ref()
+        .expect("Destination has no orbital elements.");
+
+    // Step 3: Hohmann transfer in parent's frame.
+    let home_sma = home_orbit.semi_major_axis;
+    let home_orbit_alt = home_sma - parent.radius;
+    let dest_sma = dest_orbit.semi_major_axis;
+    let hohmann = calculate_hohmann(parent, home_orbit_alt, dest_sma);
+    add_step(
+        &mut steps,
+        &mut cumulative,
+        format!("Transfer to {}", destination.name),
+        hohmann.departure_dv,
+        SegmentType::Transfer,
+        String::new(),
+    );
+
+    // Step 4: Capture at destination.
+    let esc_dest = escape_dv_from_low_orbit(destination);
+    add_step(
+        &mut steps,
+        &mut cumulative,
+        format!("Capture at {}", destination.name),
+        esc_dest,
+        SegmentType::Capture,
+        String::new(),
+    );
+
+    match moon {
+        None => {
+            // Step 5: Land on destination.
+            let (powered_dv, aerobrake_dv) = landing_dv(destination);
+            let note = match aerobrake_dv {
+                Some(v) => format!("aerobrake option: {v} m/s"),
+                None => String::new(),
+            };
+            add_step(
+                &mut steps,
+                &mut cumulative,
+                format!("Land on {}", destination.name),
+                powered_dv,
+                SegmentType::Landing,
+                note,
+            );
+        }
+        Some(moon_body) => {
+            let moon_orbit = moon_body
+                .orbit
+                .as_ref()
+                .expect("Moon has no orbital elements.");
+
+            // Step 5: Transfer from destination low orbit to moon SMA.
+            let dest_lo_alt = low_orbit_altitude(destination);
+            let moon_sma = moon_orbit.semi_major_axis;
+            let moon_hohmann = calculate_hohmann(destination, dest_lo_alt, moon_sma);
+            add_step(
+                &mut steps,
+                &mut cumulative,
+                format!("Transfer to {}", moon_body.name),
+                moon_hohmann.departure_dv,
+                SegmentType::MoonTransfer,
+                String::new(),
+            );
+
+            // Step 6: Land on moon.
+            let (powered_dv_moon, aerobrake_dv_moon) = landing_dv(moon_body);
+            let note_moon = match aerobrake_dv_moon {
+                Some(v) => format!("aerobrake option: {v} m/s"),
+                None => String::new(),
+            };
+            add_step(
+                &mut steps,
+                &mut cumulative,
+                format!("Land on {}", moon_body.name),
+                powered_dv_moon,
+                SegmentType::MoonLanding,
+                note_moon,
+            );
+        }
+    }
+
+    steps
+}
+
+// ---------------------------------------------------------------------------
+// Tests
+// ---------------------------------------------------------------------------
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::models::*;
+
+    fn make_sanctar() -> CelestialBody {
+        let mut body = CelestialBody::new(
+            "Kerbin".to_string(),
+            670_000.0,
+            1.1,
+            true,
+            Some(Atmosphere {
+                atmosphere_depth: 72_000.0,
+                pressure_curve: vec![
+                    CurveKey {
+                        position: 0.0,
+                        value: 110.444,
+                        in_tangent: 0.0,
+                        out_tangent: -0.01793,
+                    },
+                    CurveKey {
+                        position: 3547.0,
+                        value: 62.1074,
+                        in_tangent: -0.01093,
+                        out_tangent: -0.01093,
+                    },
+                ],
+                temperature_curve: vec![
+                    CurveKey {
+                        position: 0.0,
+                        value: 281.0,
+                        in_tangent: 0.0,
+                        out_tangent: -0.00536,
+                    },
+                    CurveKey {
+                        position: 72000.0,
+                        value: 187.0,
+                        in_tangent: 0.0,
+                        out_tangent: 0.0,
+                    },
+                ],
+                molar_mass: 0.02897,
+                adiabatic_index: 1.4,
+                pressure_at_sea_level: 110.444,
+                temperature_at_sea_level: 281.0,
+            }),
+            None,
+            90291.8,
+            "Sanctar".to_string(),
+        );
+        body.is_home_world = true;
+        body
+    }
+
+    fn make_kerbin() -> CelestialBody {
+        let mut body = CelestialBody::new(
+            "Kerbin".to_string(),
+            600_000.0,
+            1.0,
+            true,
+            Some(Atmosphere {
+                atmosphere_depth: 70_000.0,
+                pressure_curve: vec![
+                    CurveKey {
+                        position: 0.0,
+                        value: 101.325,
+                        in_tangent: 0.0,
+                        out_tangent: -0.015,
+                    },
+                    CurveKey {
+                        position: 70000.0,
+                        value: 0.0,
+                        in_tangent: -0.001,
+                        out_tangent: 0.0,
+                    },
+                ],
+                temperature_curve: vec![
+                    CurveKey {
+                        position: 0.0,
+                        value: 288.0,
+                        in_tangent: 0.0,
+                        out_tangent: -0.006,
+                    },
+                    CurveKey {
+                        position: 70000.0,
+                        value: 200.0,
+                        in_tangent: 0.0,
+                        out_tangent: 0.0,
+                    },
+                ],
+                molar_mass: 0.02897,
+                adiabatic_index: 1.4,
+                pressure_at_sea_level: 101.325,
+                temperature_at_sea_level: 288.0,
+            }),
+            None,
+            21549.425,
+            "Kerbin".to_string(),
+        );
+        body.is_home_world = true;
+        body
+    }
+
+    fn make_airless() -> CelestialBody {
+        CelestialBody::new(
+            "Mun".to_string(),
+            200_000.0,
+            0.166,
+            false,
+            None,
+            None,
+            0.0,
+            "Mun".to_string(),
+        )
+    }
+
+    #[test]
+    fn test_escape_velocity_sanctar() {
+        let body = make_sanctar();
+        let v = escape_velocity(&body, 0.0);
+        assert!(
+            (v - 3802.0).abs() / 3802.0 < 0.001,
+            "Expected ~3802, got {v}"
+        );
+    }
+
+    #[test]
+    fn test_escape_velocity_kerbin() {
+        let body = make_kerbin();
+        let v = escape_velocity(&body, 0.0);
+        assert!(
+            (v - 3431.0).abs() / 3431.0 < 0.002,
+            "Expected ~3431, got {v}"
+        );
+    }
+
+    #[test]
+    fn test_circular_velocity_sanctar_low_orbit() {
+        let body = make_sanctar();
+        let alt = low_orbit_altitude(&body);
+        let v = circular_velocity(&body, alt);
+        assert!(
+            (v - 2541.1).abs() / 2541.1 < 0.01,
+            "Expected ~2541.1, got {v}"
+        );
+    }
+
+    #[test]
+    fn test_low_orbit_altitude_with_atmosphere() {
+        let body = make_sanctar();
+        let alt = low_orbit_altitude(&body);
+        assert!(
+            (alt - 79200.0).abs() < 100.0,
+            "Expected ~79200 (72000 * 1.1), got {alt}"
+        );
+    }
+
+    #[test]
+    fn test_low_orbit_altitude_airless() {
+        let body = make_airless();
+        let alt = low_orbit_altitude(&body);
+        assert!(
+            (alt - 10_000.0).abs() < 1.0,
+            "Expected ~10000 (max(200000*0.05=10000, 10000)), got {alt}"
+        );
+    }
+
+    #[test]
+    fn test_surface_density_sanctar() {
+        let body = make_sanctar();
+        let rho = surface_density(&body).unwrap();
+        assert!(
+            (rho - 1.4096).abs() / 1.4096 < 0.05,
+            "Expected ~1.4096, got {rho}"
+        );
+    }
+
+    #[test]
+    fn test_surface_density_airless() {
+        let body = make_airless();
+        assert!(surface_density(&body).is_none());
+    }
+
+    #[test]
+    fn test_calculate_launch_sanctar() {
+        let body = make_sanctar();
+        let alt = low_orbit_altitude(&body);
+        let result = calculate_launch(&body, alt);
+        assert!(
+            (result.total_rocket - 3110.0).abs() / 3110.0 < 0.02,
+            "Expected total_rocket ~3110, got {}",
+            result.total_rocket
+        );
+        assert!(
+            (result.total_with_jets - 1982.0).abs() / 1982.0 < 0.02,
+            "Expected total_with_jets ~1982, got {}",
+            result.total_with_jets
+        );
+    }
+
+    #[test]
+    fn test_calculate_hohmann_outward() {
+        let body = make_sanctar();
+        let result = calculate_hohmann(&body, 80_000.0, 13_116_000_574.0);
+        assert!(result.departure_dv > 0.0);
+        assert!(result.arrival_dv > 0.0);
+        assert!(!result.inward);
+    }
+
+    #[test]
+    fn test_calculate_hohmann_inward() {
+        let body = make_sanctar();
+        let result = calculate_hohmann(&body, 80_000.0, 100_000.0);
+        assert!(result.inward);
+    }
+
+    #[test]
+    fn test_calculate_tsiolkovsky() {
+        let result = calculate_tsiolkovsky(3100.0, 310.0, 50_000.0);
+        assert!(result.mass_ratio > 1.0);
+        assert!(result.fuel_fraction > 0.0 && result.fuel_fraction < 1.0);
+        assert!(
+            (result.dry_mass + result.fuel_mass - 50_000.0).abs() < 1.0,
+            "dry + fuel should equal wet mass: {} + {} = {}",
+            result.dry_mass,
+            result.fuel_mass,
+            result.dry_mass + result.fuel_mass
+        );
+    }
+
+    #[test]
+    fn test_geostationary_altitude() {
+        let body = make_sanctar();
+        let alt = geostationary_altitude(&body);
+        assert!(
+            alt > 0.0,
+            "Geostationary altitude should be positive, got {alt}"
+        );
+    }
+
+    #[test]
+    fn test_landing_dv_with_atmosphere() {
+        let body = make_sanctar();
+        let (powered, aerobrake) = landing_dv(&body);
+        assert!(powered > 0.0);
+        assert_eq!(aerobrake, Some(0.0));
+    }
+
+    #[test]
+    fn test_landing_dv_airless() {
+        let body = make_airless();
+        let (powered, aerobrake) = landing_dv(&body);
+        assert!(powered > 0.0);
+        assert!(aerobrake.is_none());
+    }
+
+    #[test]
+    fn test_escape_dv_from_low_orbit() {
+        let body = make_sanctar();
+        let dv = escape_dv_from_low_orbit(&body);
+        assert!(dv > 0.0, "Escape dv should be positive, got {dv}");
+        // Escape dv should be less than escape velocity (since we start from orbit)
+        let v_esc = escape_velocity(&body, 0.0);
+        assert!(
+            dv < v_esc,
+            "Escape dv from orbit ({dv}) should be < surface escape ({v_esc})"
+        );
+    }
+
+    #[test]
+    fn test_density_at_altitude_above_atmosphere() {
+        let body = make_sanctar();
+        let rho = density_at_altitude(&body, 100_000.0).unwrap();
+        assert!(
+            (rho - 0.0).abs() < 1e-10,
+            "Density above atmosphere should be 0, got {rho}"
+        );
+    }
+
+    #[test]
+    fn test_compute_route_third_cosmic() {
+        let mut home = make_sanctar();
+        home.orbit = Some(OrbitalElements {
+            semi_major_axis: 13_116_000_574.0,
+            eccentricity: 0.0,
+            inclination: 0.0,
+            argument_of_periapsis: 0.0,
+            longitude_of_ascending_node: 0.0,
+            mean_anomaly_at_epoch: 0.0,
+            epoch: 0.0,
+        });
+
+        let parent = CelestialBody::new(
+            "Star".to_string(),
+            261_600_000.0,
+            1.0,
+            false,
+            None,
+            None,
+            0.0,
+            "Star".to_string(),
+        );
+
+        let steps = compute_route(&home, &parent, None, None);
+        assert_eq!(steps.len(), 3, "Third cosmic velocity should have 3 steps");
+        assert!(steps[0].dv > 0.0);
+        assert!(steps[1].dv > 0.0);
+        assert!(steps[2].dv > 0.0);
+        assert!(steps[2].cumulative > steps[1].cumulative);
+    }
+}
diff --git a/src-tauri/crates/kopdeltav/src/lib.rs b/src-tauri/crates/kopdeltav/src/lib.rs
index 3031dbb..822af36 100644
--- a/src-tauri/crates/kopdeltav/src/lib.rs
+++ b/src-tauri/crates/kopdeltav/src/lib.rs
@@ -1,2 +1,3 @@
+pub mod calculator;
 pub mod models;
 pub mod parser;

From 7ea60092209bcf380babb73e8e0ad69b48f5ebe2 Mon Sep 17 00:00:00 2001
From: Yumeno Yuuka <sounyan.is.the.angel@gmail.com>
Date: Fri, 3 Apr 2026 09:46:01 +0900
Subject: [PATCH 4/8] feat(rust): implement CelestialSystem tree and i18n
 translations

Add system.rs with build_tree, is_barycenter, sort_by_transfer_dv,
and scan_configs. Add i18n.rs with full ja/en/id translation tables
and get_text/get_all_keys API with language fallback.
---
 src-tauri/crates/kopdeltav/src/i18n.rs   | 493 +++++++++++++++++
 src-tauri/crates/kopdeltav/src/lib.rs    |   2 +
 src-tauri/crates/kopdeltav/src/system.rs | 654 +++++++++++++++++++++++
 3 files changed, 1149 insertions(+)
 create mode 100644 src-tauri/crates/kopdeltav/src/i18n.rs
 create mode 100644 src-tauri/crates/kopdeltav/src/system.rs

diff --git a/src-tauri/crates/kopdeltav/src/i18n.rs b/src-tauri/crates/kopdeltav/src/i18n.rs
new file mode 100644
index 0000000..387418b
--- /dev/null
+++ b/src-tauri/crates/kopdeltav/src/i18n.rs
@@ -0,0 +1,493 @@
+//! Multilingual translation system for CLI and backend output.
+//!
+//! Provides translation lookup by dot-notation keys with fallback to English
+//! and then to the key itself. Supports Japanese, English, and Indonesian.
+//!
+//! 多言語翻訳モジュール。
+
+use std::collections::HashMap;
+
+// ---------------------------------------------------------------------------
+// Constants
+// ---------------------------------------------------------------------------
+
+/// Supported language codes.
+pub const SUPPORTED_LANGUAGES: &[&str] = &["ja", "en", "id"];
+
+/// Default UI language.
+pub const DEFAULT_LANGUAGE: &str = "ja";
+
+// ---------------------------------------------------------------------------
+// Translation data
+// ---------------------------------------------------------------------------
+
+/// Build the complete translation table for a given language.
+///
+/// 指定言語の翻訳テーブルを構築する。
+fn build_translations(lang: &str) -> HashMap<&'static str, &'static str> {
+    match lang {
+        "ja" => build_ja(),
+        "en" => build_en(),
+        "id" => build_id(),
+        _ => HashMap::new(),
+    }
+}
+
+fn build_ja() -> HashMap<&'static str, &'static str> {
+    let mut m = HashMap::new();
+    // nav
+    m.insert("nav.title", "KSPDeltaVForMods");
+    m.insert("nav.bodies", "天体一覧");
+    // body
+    m.insert("body.name", "天体名");
+    m.insert("body.radius", "半径");
+    m.insert("body.radius_short", "半径");
+    m.insert("body.mass", "質量");
+    m.insert("body.gravity", "表面重力");
+    m.insert("body.atmosphere", "大気");
+    m.insert("body.has_atmosphere", "大気あり");
+    m.insert("body.no_atmosphere", "大気なし");
+    m.insert("body.has_ocean", "海洋あり");
+    m.insert("body.no_ocean", "海洋なし");
+    // launch
+    m.insert("launch.title", "低軌道投入\u{0394}V");
+    m.insert("launch.orbital_velocity", "軌道速度");
+    m.insert("launch.gravity_loss", "重力損失");
+    m.insert("launch.drag_loss", "大気抵抗損失");
+    m.insert("launch.total_ideal", "理論最小\u{0394}V");
+    m.insert("launch.total_rocket", "ロケット\u{0394}V\u{ff08}実用値\u{ff09}");
+    m.insert("launch.jet_savings", "ジェット節約分");
+    m.insert("launch.total_with_jets", "ジェット併用\u{0394}V");
+    m.insert("launch.target_altitude", "目標高度");
+    m.insert("launch.geostationary", "静止軌道遷移");
+    m.insert("launch.geostationary_altitude", "静止軌道高度");
+    // hohmann
+    m.insert("hohmann.title", "ホーマン遷移");
+    m.insert("hohmann.departure_dv", "出発\u{0394}V");
+    m.insert("hohmann.arrival_dv", "到着\u{0394}V");
+    m.insert("hohmann.total_dv", "合計\u{0394}V");
+    m.insert("hohmann.transfer_time", "遷移時間");
+    // tsiolkovsky
+    m.insert("tsiolkovsky.title", "ツィオルコフスキーの公式");
+    m.insert("tsiolkovsky.mass_ratio", "質量比");
+    m.insert("tsiolkovsky.fuel_fraction", "燃料割合");
+    m.insert("tsiolkovsky.dry_mass", "乾燥質量");
+    m.insert("tsiolkovsky.fuel_mass", "燃料質量");
+    m.insert("tsiolkovsky.delta_v", "\u{0394}V");
+    m.insert("tsiolkovsky.isp", "比推力");
+    m.insert("tsiolkovsky.wet_mass", "湿潤質量");
+    // atmosphere
+    m.insert("atmosphere.title", "大気プロファイル");
+    m.insert("atmosphere.depth", "大気高度上限");
+    m.insert("atmosphere.sea_level_pressure", "海面気圧");
+    m.insert("atmosphere.sea_level_temperature", "海面温度");
+    m.insert("atmosphere.sea_level_density", "海面大気密度");
+    m.insert("atmosphere.molar_mass", "モル質量");
+    m.insert("atmosphere.adiabatic_index", "断熱指数");
+    // common
+    m.insert("common.calculate", "計算");
+    m.insert("common.reset", "リセット");
+    m.insert("common.error", "エラー");
+    m.insert("common.warning", "警告");
+    m.insert("common.unit_m", "m");
+    m.insert("common.unit_ms", "m/s");
+    m.insert("common.unit_s", "秒");
+    m.insert("common.unit_kg", "kg");
+    m.insert("common.unit_kgm3", "kg/m\u{b3}");
+    m.insert("common.unit_kpa", "kPa");
+    m.insert("common.unit_k", "K");
+    // route
+    m.insert("route.launch", "低軌道投入");
+    m.insert("route.escape", "母星脱出");
+    m.insert("route.transfer", "惑星間遷移");
+    m.insert("route.orbit_insertion", "軌道投入");
+    m.insert("route.landing", "着陸");
+    m.insert("route.moon_transfer", "衛星遷移");
+    m.insert("route.moon_landing", "衛星着陸");
+    m.insert("route.system_escape", "恒星系脱出");
+    m.insert("route.third_cosmic", "第三宇宙速度");
+    m.insert("route.powered_landing", "パワード着陸");
+    m.insert("route.aerobrake_landing", "エアロブレーキ着陸");
+    m.insert("route.cumulative", "累積\u{0394}V");
+    m.insert("route.step", "ステップ");
+    m.insert("route.dv", "\u{0394}V");
+    m.insert("route.total", "合計");
+    // system
+    m.insert("system.home_world", "母星");
+    m.insert("system.star", "恒星");
+    m.insert("system.planets", "惑星一覧");
+    m.insert("system.moons", "衛星一覧");
+    m.insert("system.select_destination", "遷移先を選択");
+    m.insert("system.select_moon", "衛星を選択");
+    m.insert("system.press_enter_escape", "Enterで恒星系脱出");
+    m.insert("system.press_enter_land", "Enterで着陸");
+    m.insert("system.no_bodies", "天体が見つかりません");
+    m.insert("system.scanning", "GameDataをスキャン中...");
+    // error
+    m.insert("error.file_not_found", "ファイルが見つかりません");
+    m.insert("error.parse_error", "設定ファイルの解析に失敗しました");
+    m.insert("error.no_bodies", "天体が見つかりません");
+    m.insert("error.invalid_altitude", "高度は非負でなければなりません");
+    m
+}
+
+fn build_en() -> HashMap<&'static str, &'static str> {
+    let mut m = HashMap::new();
+    // nav
+    m.insert("nav.title", "KSPDeltaVForMods");
+    m.insert("nav.bodies", "Celestial Bodies");
+    // body
+    m.insert("body.name", "Body Name");
+    m.insert("body.radius", "Radius");
+    m.insert("body.radius_short", "R");
+    m.insert("body.mass", "Mass");
+    m.insert("body.gravity", "Surface Gravity");
+    m.insert("body.atmosphere", "Atmosphere");
+    m.insert("body.has_atmosphere", "Has Atmosphere");
+    m.insert("body.no_atmosphere", "No Atmosphere");
+    m.insert("body.has_ocean", "Has Ocean");
+    m.insert("body.no_ocean", "No Ocean");
+    // launch
+    m.insert("launch.title", "Launch to Low Orbit \u{0394}V");
+    m.insert("launch.orbital_velocity", "Orbital Velocity");
+    m.insert("launch.gravity_loss", "Gravity Loss");
+    m.insert("launch.drag_loss", "Drag Loss");
+    m.insert("launch.total_ideal", "Theoretical Minimum \u{0394}V");
+    m.insert("launch.total_rocket", "Rocket \u{0394}V (Practical)");
+    m.insert("launch.jet_savings", "Jet Engine Savings");
+    m.insert("launch.total_with_jets", "\u{0394}V with Jets");
+    m.insert("launch.target_altitude", "Target Altitude");
+    m.insert("launch.geostationary", "Geostationary Transfer");
+    m.insert("launch.geostationary_altitude", "Geostationary Altitude");
+    // hohmann
+    m.insert("hohmann.title", "Hohmann Transfer");
+    m.insert("hohmann.departure_dv", "Departure \u{0394}V");
+    m.insert("hohmann.arrival_dv", "Arrival \u{0394}V");
+    m.insert("hohmann.total_dv", "Total \u{0394}V");
+    m.insert("hohmann.transfer_time", "Transfer Time");
+    // tsiolkovsky
+    m.insert("tsiolkovsky.title", "Tsiolkovsky Rocket Equation");
+    m.insert("tsiolkovsky.mass_ratio", "Mass Ratio");
+    m.insert("tsiolkovsky.fuel_fraction", "Fuel Fraction");
+    m.insert("tsiolkovsky.dry_mass", "Dry Mass");
+    m.insert("tsiolkovsky.fuel_mass", "Fuel Mass");
+    m.insert("tsiolkovsky.delta_v", "\u{0394}V");
+    m.insert("tsiolkovsky.isp", "Specific Impulse");
+    m.insert("tsiolkovsky.wet_mass", "Wet Mass");
+    // atmosphere
+    m.insert("atmosphere.title", "Atmosphere Profile");
+    m.insert("atmosphere.depth", "Atmosphere Ceiling");
+    m.insert("atmosphere.sea_level_pressure", "Sea Level Pressure");
+    m.insert("atmosphere.sea_level_temperature", "Sea Level Temperature");
+    m.insert("atmosphere.sea_level_density", "Sea Level Density");
+    m.insert("atmosphere.molar_mass", "Molar Mass");
+    m.insert("atmosphere.adiabatic_index", "Adiabatic Index");
+    // common
+    m.insert("common.calculate", "Calculate");
+    m.insert("common.reset", "Reset");
+    m.insert("common.error", "Error");
+    m.insert("common.warning", "Warning");
+    m.insert("common.unit_m", "m");
+    m.insert("common.unit_ms", "m/s");
+    m.insert("common.unit_s", "s");
+    m.insert("common.unit_kg", "kg");
+    m.insert("common.unit_kgm3", "kg/m\u{b3}");
+    m.insert("common.unit_kpa", "kPa");
+    m.insert("common.unit_k", "K");
+    // route
+    m.insert("route.launch", "Launch to Low Orbit");
+    m.insert("route.escape", "Escape Home World");
+    m.insert("route.transfer", "Interplanetary Transfer");
+    m.insert("route.orbit_insertion", "Orbit Insertion");
+    m.insert("route.landing", "Landing");
+    m.insert("route.moon_transfer", "Moon Transfer");
+    m.insert("route.moon_landing", "Moon Landing");
+    m.insert("route.system_escape", "Star System Escape");
+    m.insert("route.third_cosmic", "Third Cosmic Velocity");
+    m.insert("route.powered_landing", "Powered Landing");
+    m.insert("route.aerobrake_landing", "Aerobrake Landing");
+    m.insert("route.cumulative", "Cumulative \u{0394}V");
+    m.insert("route.step", "Step");
+    m.insert("route.dv", "\u{0394}V");
+    m.insert("route.total", "Total");
+    // system
+    m.insert("system.home_world", "Home World");
+    m.insert("system.star", "Star");
+    m.insert("system.planets", "Planets");
+    m.insert("system.moons", "Moons");
+    m.insert("system.select_destination", "Select destination");
+    m.insert("system.select_moon", "Select moon");
+    m.insert("system.press_enter_escape", "Press Enter for system escape");
+    m.insert("system.press_enter_land", "Press Enter to land");
+    m.insert("system.no_bodies", "No celestial bodies found");
+    m.insert("system.scanning", "Scanning GameData...");
+    // error
+    m.insert("error.file_not_found", "File not found");
+    m.insert("error.parse_error", "Failed to parse configuration file");
+    m.insert("error.no_bodies", "No celestial bodies found");
+    m.insert("error.invalid_altitude", "Altitude must be non-negative");
+    m
+}
+
+fn build_id() -> HashMap<&'static str, &'static str> {
+    let mut m = HashMap::new();
+    // nav
+    m.insert("nav.title", "KSPDeltaVForMods");
+    m.insert("nav.bodies", "Daftar Benda Langit");
+    // body
+    m.insert("body.name", "Nama Benda Langit");
+    m.insert("body.radius", "Radius");
+    m.insert("body.radius_short", "R");
+    m.insert("body.mass", "Massa");
+    m.insert("body.gravity", "Gravitasi Permukaan");
+    m.insert("body.atmosphere", "Atmosfer");
+    m.insert("body.has_atmosphere", "Memiliki Atmosfer");
+    m.insert("body.no_atmosphere", "Tanpa Atmosfer");
+    m.insert("body.has_ocean", "Memiliki Lautan");
+    m.insert("body.no_ocean", "Tanpa Lautan");
+    // launch
+    m.insert("launch.title", "\u{0394}V Peluncuran ke Orbit Rendah");
+    m.insert("launch.orbital_velocity", "Kecepatan Orbit");
+    m.insert("launch.gravity_loss", "Kehilangan Gravitasi");
+    m.insert("launch.drag_loss", "Kehilangan Hambatan Udara");
+    m.insert("launch.total_ideal", "\u{0394}V Minimum Teoritis");
+    m.insert("launch.total_rocket", "\u{0394}V Roket (Praktis)");
+    m.insert("launch.jet_savings", "Penghematan Mesin Jet");
+    m.insert("launch.total_with_jets", "\u{0394}V dengan Jet");
+    m.insert("launch.target_altitude", "Ketinggian Target");
+    m.insert("launch.geostationary", "Transfer Geostasioner");
+    m.insert("launch.geostationary_altitude", "Ketinggian Geostasioner");
+    // hohmann
+    m.insert("hohmann.title", "Transfer Hohmann");
+    m.insert("hohmann.departure_dv", "\u{0394}V Keberangkatan");
+    m.insert("hohmann.arrival_dv", "\u{0394}V Kedatangan");
+    m.insert("hohmann.total_dv", "\u{0394}V Total");
+    m.insert("hohmann.transfer_time", "Waktu Transfer");
+    // tsiolkovsky
+    m.insert("tsiolkovsky.title", "Persamaan Roket Tsiolkovsky");
+    m.insert("tsiolkovsky.mass_ratio", "Rasio Massa");
+    m.insert("tsiolkovsky.fuel_fraction", "Fraksi Bahan Bakar");
+    m.insert("tsiolkovsky.dry_mass", "Massa Kering");
+    m.insert("tsiolkovsky.fuel_mass", "Massa Bahan Bakar");
+    m.insert("tsiolkovsky.delta_v", "\u{0394}V");
+    m.insert("tsiolkovsky.isp", "Impuls Spesifik");
+    m.insert("tsiolkovsky.wet_mass", "Massa Basah");
+    // atmosphere
+    m.insert("atmosphere.title", "Profil Atmosfer");
+    m.insert("atmosphere.depth", "Batas Ketinggian Atmosfer");
+    m.insert("atmosphere.sea_level_pressure", "Tekanan Permukaan Laut");
+    m.insert("atmosphere.sea_level_temperature", "Suhu Permukaan Laut");
+    m.insert("atmosphere.sea_level_density", "Kepadatan Permukaan Laut");
+    m.insert("atmosphere.molar_mass", "Massa Molar");
+    m.insert("atmosphere.adiabatic_index", "Indeks Adiabatik");
+    // common
+    m.insert("common.calculate", "Hitung");
+    m.insert("common.reset", "Atur Ulang");
+    m.insert("common.error", "Kesalahan");
+    m.insert("common.warning", "Peringatan");
+    m.insert("common.unit_m", "m");
+    m.insert("common.unit_ms", "m/s");
+    m.insert("common.unit_s", "s");
+    m.insert("common.unit_kg", "kg");
+    m.insert("common.unit_kgm3", "kg/m\u{b3}");
+    m.insert("common.unit_kpa", "kPa");
+    m.insert("common.unit_k", "K");
+    // route
+    m.insert("route.launch", "Peluncuran ke Orbit Rendah");
+    m.insert("route.escape", "Lepas dari Planet Asal");
+    m.insert("route.transfer", "Transfer Antarplanet");
+    m.insert("route.orbit_insertion", "Penyisipan Orbit");
+    m.insert("route.landing", "Pendaratan");
+    m.insert("route.moon_transfer", "Transfer Bulan");
+    m.insert("route.moon_landing", "Pendaratan Bulan");
+    m.insert("route.system_escape", "Lepas dari Sistem Bintang");
+    m.insert("route.third_cosmic", "Kecepatan Kosmis Ketiga");
+    m.insert("route.powered_landing", "Pendaratan Berdaya");
+    m.insert("route.aerobrake_landing", "Pendaratan Aerobrake");
+    m.insert("route.cumulative", "\u{0394}V Kumulatif");
+    m.insert("route.step", "Langkah");
+    m.insert("route.dv", "\u{0394}V");
+    m.insert("route.total", "Total");
+    // system
+    m.insert("system.home_world", "Planet Asal");
+    m.insert("system.star", "Bintang");
+    m.insert("system.planets", "Planet");
+    m.insert("system.moons", "Bulan");
+    m.insert("system.select_destination", "Pilih tujuan");
+    m.insert("system.select_moon", "Pilih bulan");
+    m.insert(
+        "system.press_enter_escape",
+        "Tekan Enter untuk lepas dari sistem",
+    );
+    m.insert("system.press_enter_land", "Tekan Enter untuk mendarat");
+    m.insert("system.no_bodies", "Tidak ada benda langit ditemukan");
+    m.insert("system.scanning", "Memindai GameData...");
+    // error
+    m.insert("error.file_not_found", "Berkas tidak ditemukan");
+    m.insert("error.parse_error", "Gagal mengurai berkas konfigurasi");
+    m.insert("error.no_bodies", "Tidak ada benda langit ditemukan");
+    m.insert("error.invalid_altitude", "Ketinggian harus non-negatif");
+    m
+}
+
+// ---------------------------------------------------------------------------
+// Public API
+// ---------------------------------------------------------------------------
+
+/// Get translated text by dot-notation key.
+///
+/// 翻訳文字列を取得する。要求言語にキーがなければ英語にフォールバックし、
+/// 英語にもなければキー文字列をそのまま返す。
+///
+/// # Arguments
+/// * `key` - Dot-notation key (e.g. "launch.title", "common.calculate").
+/// * `lang` - Language code ("ja", "en", or "id"). Falls back to English
+///   if the key is missing in the requested language.
+///
+/// # Returns
+/// Translated string. Returns the key itself if not found in any language.
+pub fn get_text(key: &str, lang: &str) -> String {
+    let effective_lang = if SUPPORTED_LANGUAGES.contains(&lang) {
+        lang
+    } else {
+        DEFAULT_LANGUAGE
+    };
+
+    // Key must be "category.name" format
+    if !key.contains('.') {
+        return key.to_string();
+    }
+
+    // Try requested language first
+    let translations = build_translations(effective_lang);
+    if let Some(value) = translations.get(key) {
+        return (*value).to_string();
+    }
+
+    // Fall back to English
+    if effective_lang != "en" {
+        let en_translations = build_translations("en");
+        if let Some(value) = en_translations.get(key) {
+            return (*value).to_string();
+        }
+    }
+
+    // Key not found anywhere: return the key itself
+    key.to_string()
+}
+
+/// Get all translation keys flattened to dot-notation for a language.
+///
+/// 全翻訳キーをフラット化して返す。
+///
+/// # Arguments
+/// * `lang` - Language code ("ja", "en", or "id"). Falls back to DEFAULT_LANGUAGE
+///   if not supported.
+///
+/// # Returns
+/// HashMap mapping dot-notation keys to translated strings.
+pub fn get_all_keys(lang: &str) -> HashMap<String, String> {
+    let effective_lang = if SUPPORTED_LANGUAGES.contains(&lang) {
+        lang
+    } else {
+        DEFAULT_LANGUAGE
+    };
+
+    build_translations(effective_lang)
+        .into_iter()
+        .map(|(k, v)| (k.to_string(), v.to_string()))
+        .collect()
+}
+
+// ---------------------------------------------------------------------------
+// Tests
+// ---------------------------------------------------------------------------
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_get_text_japanese() {
+        assert_eq!(get_text("nav.title", "ja"), "KSPDeltaVForMods");
+    }
+
+    #[test]
+    fn test_get_text_english() {
+        assert_eq!(get_text("nav.bodies", "en"), "Celestial Bodies");
+    }
+
+    #[test]
+    fn test_get_text_indonesian() {
+        assert_eq!(get_text("nav.bodies", "id"), "Daftar Benda Langit");
+    }
+
+    #[test]
+    fn test_get_text_fallback_to_default_then_english() {
+        // Unsupported lang falls back to DEFAULT_LANGUAGE ("ja") first
+        // "nav.title" is "KSPDeltaVForMods" in all languages
+        assert_eq!(get_text("nav.title", "xx"), "KSPDeltaVForMods");
+    }
+
+    #[test]
+    fn test_get_text_unknown_key_returns_key() {
+        assert_eq!(get_text("unknown.key", "en"), "unknown.key");
+    }
+
+    #[test]
+    fn test_get_all_keys_has_entries() {
+        let keys = get_all_keys("en");
+        assert!(keys.contains_key("nav.title"));
+        assert!(keys.contains_key("launch.title"));
+    }
+
+    #[test]
+    fn test_get_all_keys_unsupported_lang_uses_default() {
+        let keys = get_all_keys("xx");
+        // Should fall back to Japanese (DEFAULT_LANGUAGE)
+        assert_eq!(keys.get("nav.bodies").unwrap(), "天体一覧");
+    }
+
+    #[test]
+    fn test_get_text_no_dot_returns_key() {
+        assert_eq!(get_text("nodotkey", "en"), "nodotkey");
+    }
+
+    #[test]
+    fn test_all_three_languages_have_same_keys() {
+        let ja_keys: Vec<String> = get_all_keys("ja").keys().cloned().collect();
+        let en_keys = get_all_keys("en");
+        let id_keys = get_all_keys("id");
+        for key in &ja_keys {
+            assert!(
+                en_keys.contains_key(key),
+                "English missing key: {}",
+                key
+            );
+            assert!(
+                id_keys.contains_key(key),
+                "Indonesian missing key: {}",
+                key
+            );
+        }
+    }
+
+    #[test]
+    fn test_japanese_specific_values() {
+        assert_eq!(get_text("common.calculate", "ja"), "計算");
+        assert_eq!(get_text("common.reset", "ja"), "リセット");
+        assert_eq!(get_text("hohmann.title", "ja"), "ホーマン遷移");
+    }
+
+    #[test]
+    fn test_english_specific_values() {
+        assert_eq!(get_text("common.calculate", "en"), "Calculate");
+        assert_eq!(get_text("hohmann.title", "en"), "Hohmann Transfer");
+    }
+
+    #[test]
+    fn test_indonesian_specific_values() {
+        assert_eq!(get_text("common.calculate", "id"), "Hitung");
+        assert_eq!(get_text("hohmann.title", "id"), "Transfer Hohmann");
+    }
+}
diff --git a/src-tauri/crates/kopdeltav/src/lib.rs b/src-tauri/crates/kopdeltav/src/lib.rs
index 822af36..a238ed8 100644
--- a/src-tauri/crates/kopdeltav/src/lib.rs
+++ b/src-tauri/crates/kopdeltav/src/lib.rs
@@ -1,3 +1,5 @@
 pub mod calculator;
+pub mod i18n;
 pub mod models;
 pub mod parser;
+pub mod system;
diff --git a/src-tauri/crates/kopdeltav/src/system.rs b/src-tauri/crates/kopdeltav/src/system.rs
new file mode 100644
index 0000000..1226c12
--- /dev/null
+++ b/src-tauri/crates/kopdeltav/src/system.rs
@@ -0,0 +1,654 @@
+//! Celestial system tree construction and GameData config scanning.
+//!
+//! Builds parent/children relationships from a flat list of parsed bodies,
+//! identifies root star and home world, computes SOI, and provides
+//! transfer-DV sorting and GameData directory scanning.
+//!
+//! 天体ツリーの構築と GameData/ の .cfg ファイルスキャンを提供する。
+
+use std::collections::HashMap;
+use std::path::Path;
+
+use crate::calculator::calculate_hohmann;
+use crate::models::CelestialBody;
+use crate::parser::parse_bodies_with_filename;
+
+// ---------------------------------------------------------------------------
+// CelestialSystem
+// ---------------------------------------------------------------------------
+
+/// A fully linked tree of celestial bodies parsed from Kopernicus configs.
+///
+/// Kopernicus 設定からパースされた天体の完全なツリー構造。
+pub struct CelestialSystem {
+    /// Internal name of the root star (top of the hierarchy).
+    pub root_name: String,
+    /// Flat name -> body lookup for O(1) access.
+    pub bodies: HashMap<String, CelestialBody>,
+    /// Internal name of the home world body.
+    pub home_world_name: String,
+}
+
+// ---------------------------------------------------------------------------
+// Barycenter detection
+// ---------------------------------------------------------------------------
+
+/// Heuristic: detect if a body is likely a system barycenter.
+///
+/// 天体がバリセンタ(重心)かどうかをヒューリスティクスで判定する。
+///
+/// A body is treated as a barycenter when it has children and its
+/// radius is smaller than the smallest child's radius.
+///
+/// # Arguments
+/// * `body` - The body to check.
+/// * `bodies` - All bodies in the system, for child lookup.
+///
+/// # Returns
+/// `true` if the body is likely a barycenter.
+pub fn is_barycenter(body: &CelestialBody, bodies: &HashMap<String, CelestialBody>) -> bool {
+    if body.children_names.is_empty() {
+        return false;
+    }
+    let min_child_radius = body
+        .children_names
+        .iter()
+        .filter_map(|name| bodies.get(name))
+        .map(|c| c.radius)
+        .fold(f64::INFINITY, f64::min);
+
+    if min_child_radius == f64::INFINITY {
+        // No children resolved in the map
+        return false;
+    }
+    body.radius < min_child_radius
+}
+
+// ---------------------------------------------------------------------------
+// Body completeness scoring (deduplication)
+// ---------------------------------------------------------------------------
+
+/// Score how complete a body's data is, for deduplication priority.
+///
+/// 天体データの完全度をスコア化する(重複排除の優先度判定用)。
+fn body_completeness(body: &CelestialBody) -> i32 {
+    let mut score = 0;
+    if body.is_home_world {
+        score += 100;
+    }
+    if body.orbit.is_some() {
+        score += 10;
+    }
+    if !body.reference_body_name.is_empty() {
+        score += 5;
+    }
+    if body.atmosphere.is_some() {
+        score += 3;
+    }
+    if body.radius > 0.0 {
+        score += 1;
+    }
+    score
+}
+
+// ---------------------------------------------------------------------------
+// Tree construction
+// ---------------------------------------------------------------------------
+
+/// Build a parent/children tree from a flat list of bodies.
+///
+/// フラットな天体リストから親子関係ツリーを構築する。
+///
+/// Steps:
+/// 1. Deduplicate by name (prefer more complete: is_home_world > has orbit > has reference_body_name).
+/// 2. Link parent_name / children_names using reference_body_name.
+/// 3. Find root (no orbit, no reference_body_name, has children).
+/// 4. Find home world (is_home_world=true; fallback: Kerbin-like > has ocean > has atmosphere).
+/// 5. Compute SOI where soi == 0: `soi = a * (mu_body / mu_parent)^0.4`.
+///
+/// # Arguments
+/// * `bodies` - Flat list of `CelestialBody` objects (e.g. from `parse_bodies`).
+///
+/// # Returns
+/// A fully linked `CelestialSystem`, or an error if the list is empty or no root found.
+///
+/// # Errors
+/// Returns `Err` if `bodies` is empty.
+pub fn build_tree(bodies: Vec<CelestialBody>) -> Result<CelestialSystem, String> {
+    if bodies.is_empty() {
+        return Err("Cannot build tree from an empty body list".to_string());
+    }
+
+    // Step 1: deduplicate by name, preferring the most complete version.
+    let mut index: HashMap<String, CelestialBody> = HashMap::new();
+    for body in bodies {
+        let name = body.name.clone();
+        if let Some(existing) = index.get(&name) {
+            if body_completeness(&body) > body_completeness(existing) {
+                index.insert(name, body);
+            }
+        } else {
+            index.insert(name, body);
+        }
+    }
+
+    // Reset parent/children to avoid stale links.
+    for body in index.values_mut() {
+        body.parent_name = None;
+        body.children_names.clear();
+    }
+
+    // Step 2: link parent/children using reference_body_name.
+    // Collect linkage info first to satisfy borrow checker.
+    let links: Vec<(String, String)> = index
+        .values()
+        .filter(|b| !b.reference_body_name.is_empty())
+        .map(|b| (b.name.clone(), b.reference_body_name.clone()))
+        .collect();
+
+    for (child_name, parent_name) in &links {
+        if !index.contains_key(parent_name) {
+            eprintln!(
+                "system warning: body '{}' references unknown referenceBody '{}'",
+                child_name, parent_name
+            );
+            continue;
+        }
+        // Set parent_name on child
+        if let Some(child) = index.get_mut(child_name) {
+            child.parent_name = Some(parent_name.clone());
+        }
+        // Add child to parent's children_names
+        if let Some(parent) = index.get_mut(parent_name) {
+            if !parent.children_names.contains(child_name) {
+                parent.children_names.push(child_name.clone());
+            }
+        }
+    }
+
+    // Step 3: find root.
+    // Primary: body with no orbit AND no reference_body_name AND has children.
+    let mut root_name: Option<String> = None;
+
+    let candidates: Vec<String> = index
+        .values()
+        .filter(|b| b.orbit.is_none() && b.reference_body_name.is_empty())
+        .map(|b| b.name.clone())
+        .collect();
+
+    if !candidates.is_empty() {
+        let with_children: Vec<&String> = candidates
+            .iter()
+            .filter(|name| {
+                index
+                    .get(name.as_str())
+                    .is_some_and(|b| !b.children_names.is_empty())
+            })
+            .collect();
+        root_name = Some(if !with_children.is_empty() {
+            with_children[0].clone()
+        } else {
+            candidates[0].clone()
+        });
+    }
+
+    // Fallback: body with no parent link after tree construction, that has children.
+    if root_name.is_none() {
+        let orphans: Vec<String> = index
+            .values()
+            .filter(|b| b.parent_name.is_none() && !b.children_names.is_empty())
+            .map(|b| b.name.clone())
+            .collect();
+        if !orphans.is_empty() {
+            root_name = Some(orphans[0].clone());
+        }
+    }
+
+    // Last resort: first body in the map
+    let root_name = root_name.unwrap_or_else(|| {
+        let first = index.keys().next().expect("index is non-empty");
+        eprintln!(
+            "system warning: cannot determine root; defaulting to '{}'",
+            first
+        );
+        first.clone()
+    });
+
+    // Step 4: home world.
+    let mut home_world_name: Option<String> = None;
+    for body in index.values() {
+        if body.is_home_world {
+            home_world_name = Some(body.name.clone());
+            break;
+        }
+    }
+
+    if home_world_name.is_none() {
+        // Fallback: pick the best candidate using a heuristic score.
+        let best = index
+            .values()
+            .max_by_key(|b| {
+                let mut score: i32 = 0;
+                if b.name.trim().eq_ignore_ascii_case("kerbin") {
+                    score += 100;
+                }
+                if b.has_ocean {
+                    score += 50;
+                }
+                if b.atmosphere.is_some() {
+                    score += 30;
+                }
+                if b.rotational_period > 0.0 {
+                    score += 10;
+                }
+                if b.orbit.is_some() {
+                    score += 5;
+                }
+                if b.parent_name.is_some() {
+                    score += 2;
+                }
+                score
+            })
+            .expect("index is non-empty");
+
+        home_world_name = Some(best.name.clone());
+        eprintln!(
+            "system warning: no body declares isHomeWorld=true; falling back to '{}' as home world",
+            best.name
+        );
+
+        // Mark it as home world
+        if let Some(body) = index.get_mut(&home_world_name.clone().unwrap()) {
+            body.is_home_world = true;
+        }
+    }
+
+    let home_world_name = home_world_name.expect("home world resolved above");
+
+    // Step 5: compute SOI where soi == 0.
+    // Collect (name, soi) pairs to assign, to satisfy borrow checker.
+    let soi_updates: Vec<(String, f64)> = index
+        .values()
+        .filter_map(|body| {
+            if body.soi != 0.0 || body.parent_name.is_none() || body.orbit.is_none() {
+                return None;
+            }
+            let parent_name = body.parent_name.as_ref()?;
+            let parent = index.get(parent_name)?;
+            let a = body.orbit.as_ref()?.semi_major_axis;
+            let mu_body = body.mu;
+            let mu_parent = parent.mu;
+            if mu_parent > 0.0 && a > 0.0 {
+                let soi = a * (mu_body / mu_parent).powf(0.4);
+                Some((body.name.clone(), soi))
+            } else {
+                None
+            }
+        })
+        .collect();
+
+    for (name, soi) in soi_updates {
+        if let Some(body) = index.get_mut(&name) {
+            body.soi = soi;
+        }
+    }
+
+    Ok(CelestialSystem {
+        root_name,
+        bodies: index,
+        home_world_name,
+    })
+}
+
+// ---------------------------------------------------------------------------
+// Transfer DV sorting
+// ---------------------------------------------------------------------------
+
+/// Sort sibling bodies by Hohmann transfer DV from origin, ascending.
+///
+/// origin からのホーマン遷移 DV 昇順でターゲット天体をソートする。
+///
+/// The origin must orbit a parent body. Siblings of origin (other children of the
+/// same parent) are sorted by their Hohmann transfer DV.
+///
+/// # Arguments
+/// * `origin_name` - Name of the departure body.
+/// * `bodies` - All bodies in the system.
+///
+/// # Returns
+/// List of `(target_name, total_dv)` tuples sorted ascending by total_dv.
+/// Bodies that cannot be evaluated are omitted.
+pub fn sort_by_transfer_dv(
+    origin_name: &str,
+    bodies: &HashMap<String, CelestialBody>,
+) -> Vec<(String, f64)> {
+    let origin = match bodies.get(origin_name) {
+        Some(b) => b,
+        None => return Vec::new(),
+    };
+
+    let origin_orbit = match &origin.orbit {
+        Some(o) => o,
+        None => return Vec::new(),
+    };
+
+    let parent_name = match &origin.parent_name {
+        Some(n) => n.clone(),
+        None => return Vec::new(),
+    };
+
+    let parent = match bodies.get(&parent_name) {
+        Some(p) => p,
+        None => return Vec::new(),
+    };
+
+    // Collect siblings (other children of the same parent)
+    let siblings: Vec<String> = parent
+        .children_names
+        .iter()
+        .filter(|n| n.as_str() != origin_name)
+        .cloned()
+        .collect();
+
+    let origin_sma = origin_orbit.semi_major_axis;
+
+    let mut results: Vec<(String, f64)> = Vec::new();
+    for sibling_name in &siblings {
+        let sibling = match bodies.get(sibling_name) {
+            Some(s) => s,
+            None => continue,
+        };
+        let target_sma = match &sibling.orbit {
+            Some(o) => o.semi_major_axis,
+            None => continue,
+        };
+
+        let parking_altitude = origin_sma - parent.radius;
+        if parking_altitude < 0.0 {
+            continue;
+        }
+
+        let hohmann = calculate_hohmann(parent, parking_altitude, target_sma);
+        results.push((sibling_name.clone(), hohmann.total_dv));
+    }
+
+    results.sort_by(|a, b| a.1.partial_cmp(&b.1).unwrap_or(std::cmp::Ordering::Equal));
+    results
+}
+
+// ---------------------------------------------------------------------------
+// GameData config scanner
+// ---------------------------------------------------------------------------
+
+/// Recursively scan a GameData directory for Kopernicus `.cfg` files and build a tree.
+///
+/// GameData/ ディレクトリを再帰スキャンし、Kopernicus 設定から天体ツリーを構築する。
+///
+/// All `.cfg` files are read. Directories whose lowercase names appear in
+/// `exclude_dirs` are skipped entirely (default: `["kopernicus"]`).
+///
+/// # Arguments
+/// * `gamedata_path` - Path to the `GameData/` directory.
+/// * `exclude_dirs` - Directory names (lowercase) to skip during scan.
+///
+/// # Returns
+/// A `CelestialSystem` built from all bodies found, or an error.
+///
+/// # Errors
+/// Returns `Err` if the path is not a directory, no bodies are found, or tree construction fails.
+pub fn scan_configs(
+    gamedata_path: &str,
+    exclude_dirs: &[String],
+) -> Result<CelestialSystem, String> {
+    let path = Path::new(gamedata_path);
+    if !path.is_dir() {
+        return Err(format!(
+            "gamedata_path is not an existing directory: {}",
+            gamedata_path
+        ));
+    }
+
+    let cfg_files = iter_cfgs(path, exclude_dirs);
+    let mut all_bodies: Vec<CelestialBody> = Vec::new();
+
+    for cfg_path in &cfg_files {
+        let source = match std::fs::read_to_string(cfg_path) {
+            Ok(s) => s,
+            Err(e) => {
+                eprintln!("system warning: cannot read '{}': {}", cfg_path.display(), e);
+                continue;
+            }
+        };
+
+        let filename = cfg_path
+            .file_stem()
+            .and_then(|s| s.to_str())
+            .unwrap_or("");
+        let bodies = parse_bodies_with_filename(&source, filename);
+        if bodies.is_empty() {
+            continue;
+        }
+
+        all_bodies.extend(bodies);
+    }
+
+    if all_bodies.is_empty() {
+        return Err(format!(
+            "No celestial bodies found under '{}'",
+            gamedata_path
+        ));
+    }
+
+    build_tree(all_bodies)
+}
+
+/// Recursively collect .cfg files under a directory, skipping excluded dirs.
+///
+/// ディレクトリ以下の .cfg ファイルを再帰的に収集する。
+fn iter_cfgs(directory: &Path, exclude_dirs: &[String]) -> Vec<std::path::PathBuf> {
+    let mut results = Vec::new();
+
+    let entries = match std::fs::read_dir(directory) {
+        Ok(e) => e,
+        Err(e) => {
+            eprintln!(
+                "system warning: cannot list directory '{}': {}",
+                directory.display(),
+                e
+            );
+            return results;
+        }
+    };
+
+    let mut sorted_entries: Vec<std::path::PathBuf> = entries
+        .filter_map(|e| e.ok())
+        .map(|e| e.path())
+        .collect();
+    sorted_entries.sort();
+
+    for entry in &sorted_entries {
+        if entry.is_dir() {
+            let dir_name = entry
+                .file_name()
+                .and_then(|s| s.to_str())
+                .unwrap_or("")
+                .to_lowercase();
+            if exclude_dirs.iter().any(|ex| ex.to_lowercase() == dir_name) {
+                continue;
+            }
+            results.extend(iter_cfgs(entry, exclude_dirs));
+        } else if entry.is_file() {
+            let ext = entry
+                .extension()
+                .and_then(|s| s.to_str())
+                .unwrap_or("")
+                .to_lowercase();
+            if ext == "cfg" {
+                results.push(entry.clone());
+            }
+        }
+    }
+
+    results
+}
+
+// ---------------------------------------------------------------------------
+// Tests
+// ---------------------------------------------------------------------------
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::models::*;
+
+    fn make_star() -> CelestialBody {
+        CelestialBody::new(
+            "Sun".to_string(),
+            261_600_000.0,
+            1.75,
+            false,
+            None,
+            None,
+            0.0,
+            "Sun".to_string(),
+        )
+    }
+
+    fn make_planet(name: &str, ref_body: &str) -> CelestialBody {
+        let mut body = CelestialBody::new(
+            name.to_string(),
+            600_000.0,
+            1.0,
+            true,
+            None,
+            Some(OrbitalElements {
+                semi_major_axis: 13_599_840_256.0,
+                eccentricity: 0.0,
+                inclination: 0.0,
+                argument_of_periapsis: 0.0,
+                longitude_of_ascending_node: 0.0,
+                mean_anomaly_at_epoch: 0.0,
+                epoch: 0.0,
+            }),
+            21549.0,
+            name.to_string(),
+        );
+        body.reference_body_name = ref_body.to_string();
+        body
+    }
+
+    #[test]
+    fn test_build_tree_basic() {
+        let star = make_star();
+        let mut planet = make_planet("Kerbin", "Sun");
+        planet.is_home_world = true;
+        let system = build_tree(vec![star, planet]).unwrap();
+        assert_eq!(system.root_name, "Sun");
+        assert_eq!(system.home_world_name, "Kerbin");
+        let kerbin = &system.bodies["Kerbin"];
+        assert_eq!(kerbin.parent_name, Some("Sun".to_string()));
+        let sun = &system.bodies["Sun"];
+        assert!(sun.children_names.contains(&"Kerbin".to_string()));
+    }
+
+    #[test]
+    fn test_build_tree_empty_fails() {
+        assert!(build_tree(vec![]).is_err());
+    }
+
+    #[test]
+    fn test_build_tree_soi_computation() {
+        let star = make_star();
+        let mut planet = make_planet("Kerbin", "Sun");
+        planet.is_home_world = true;
+        let system = build_tree(vec![star, planet]).unwrap();
+        let kerbin = &system.bodies["Kerbin"];
+        assert!(kerbin.soi > 0.0);
+    }
+
+    #[test]
+    fn test_build_tree_dedup() {
+        let star = make_star();
+        let p1 = make_planet("Kerbin", "Sun");
+        let mut p2 = make_planet("Kerbin", "Sun");
+        p2.is_home_world = true;
+        let system = build_tree(vec![star, p1, p2]).unwrap();
+        // p2 should win (is_home_world = true)
+        assert_eq!(system.home_world_name, "Kerbin");
+    }
+
+    #[test]
+    fn test_is_barycenter() {
+        let mut parent = make_star();
+        parent.radius = 100.0; // tiny
+        parent.name = "Tiny".to_string();
+        parent.children_names = vec!["Big".to_string()];
+        let mut child = make_planet("Big", "Tiny");
+        child.radius = 600_000.0;
+        let mut bodies = HashMap::new();
+        bodies.insert("Tiny".to_string(), parent);
+        bodies.insert("Big".to_string(), child);
+        assert!(is_barycenter(&bodies["Tiny"], &bodies));
+        assert!(!is_barycenter(&bodies["Big"], &bodies));
+    }
+
+    #[test]
+    fn test_home_world_fallback() {
+        // No body has is_home_world = true; the one with ocean/atmosphere should win.
+        let star = make_star();
+        let mut planet = make_planet("Kerbin", "Sun");
+        // Don't set is_home_world; the heuristic should still pick Kerbin by name.
+        planet.is_home_world = false;
+        let system = build_tree(vec![star, planet]).unwrap();
+        assert_eq!(system.home_world_name, "Kerbin");
+        assert!(system.bodies["Kerbin"].is_home_world);
+    }
+
+    #[test]
+    fn test_sort_by_transfer_dv_basic() {
+        let mut star = make_star();
+        star.children_names = vec!["Inner".to_string(), "Outer".to_string()];
+
+        let mut inner = make_planet("Inner", "Sun");
+        inner.is_home_world = true;
+        inner.orbit = Some(OrbitalElements {
+            semi_major_axis: 10_000_000_000.0,
+            eccentricity: 0.0,
+            inclination: 0.0,
+            argument_of_periapsis: 0.0,
+            longitude_of_ascending_node: 0.0,
+            mean_anomaly_at_epoch: 0.0,
+            epoch: 0.0,
+        });
+        inner.parent_name = Some("Sun".to_string());
+
+        let mut outer = make_planet("Outer", "Sun");
+        outer.orbit = Some(OrbitalElements {
+            semi_major_axis: 20_000_000_000.0,
+            eccentricity: 0.0,
+            inclination: 0.0,
+            argument_of_periapsis: 0.0,
+            longitude_of_ascending_node: 0.0,
+            mean_anomaly_at_epoch: 0.0,
+            epoch: 0.0,
+        });
+        outer.parent_name = Some("Sun".to_string());
+
+        let mut bodies = HashMap::new();
+        bodies.insert("Sun".to_string(), star);
+        bodies.insert("Inner".to_string(), inner);
+        bodies.insert("Outer".to_string(), outer);
+
+        let result = sort_by_transfer_dv("Inner", &bodies);
+        assert_eq!(result.len(), 1);
+        assert_eq!(result[0].0, "Outer");
+        assert!(result[0].1 > 0.0);
+    }
+
+    #[test]
+    fn test_sort_by_transfer_dv_no_orbit() {
+        let bodies: HashMap<String, CelestialBody> = HashMap::new();
+        let result = sort_by_transfer_dv("Missing", &bodies);
+        assert!(result.is_empty());
+    }
+}

From 6b0bcf9c68a71336218d80d68e420133e6970659 Mon Sep 17 00:00:00 2001
From: Yumeno Yuuka <sounyan.is.the.angel@gmail.com>
Date: Fri, 3 Apr 2026 09:52:17 +0900
Subject: [PATCH 5/8] feat(tauri): implement native commands, remove Python
 subprocess

Replace the Python subprocess spawning architecture with native Rust
Tauri commands that directly call the kopdeltav crate. Add state.rs
for shared AppState (bodies + system tree) and commands.rs with 13
IPC handlers covering health, config upload, GameData scan, body
listing/detail, launch/hohmann/tsiolkovsky calculations, system
tree, destinations, route planning, atmosphere profiles, and moon
queries. Remove tauri-plugin-shell dependency and Python resource
bundling from tauri.conf.json.
---
 src-tauri/Cargo.lock      | 130 -------
 src-tauri/Cargo.toml      |   1 -
 src-tauri/src/commands.rs | 693 ++++++++++++++++++++++++++++++++++++++
 src-tauri/src/main.rs     |  61 ++--
 src-tauri/src/state.rs    |  32 ++
 src-tauri/tauri.conf.json |  12 +-
 6 files changed, 747 insertions(+), 182 deletions(-)
 create mode 100644 src-tauri/src/commands.rs
 create mode 100644 src-tauri/src/state.rs

diff --git a/src-tauri/Cargo.lock b/src-tauri/Cargo.lock
index 5226587..8d1b63d 100644
--- a/src-tauri/Cargo.lock
+++ b/src-tauri/Cargo.lock
@@ -697,15 +697,6 @@ version = "1.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4ef6b89e5b37196644d8796de5268852ff179b44e96276cf4290264843743bb7"
 
-[[package]]
-name = "encoding_rs"
-version = "0.8.35"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "75030f3c4f45dafd7586dd6780965a8c7e8e285a5ecb86713e63a79c5b2766f3"
-dependencies = [
- "cfg-if",
-]
-
 [[package]]
 name = "equivalent"
 version = "1.0.2"
@@ -723,16 +714,6 @@ dependencies = [
  "typeid",
 ]
 
-[[package]]
-name = "errno"
-version = "0.3.14"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39cab71617ae0d63f51a36d69f866391735b51691dbda63cf6f96d042b63efeb"
-dependencies = [
- "libc",
- "windows-sys 0.61.2",
-]
-
 [[package]]
 name = "fastrand"
 version = "2.3.0"
@@ -1562,25 +1543,6 @@ dependencies = [
  "serde",
 ]
 
-[[package]]
-name = "is-docker"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "928bae27f42bc99b60d9ac7334e3a21d10ad8f1835a4e12ec3ec0464765ed1b3"
-dependencies = [
- "once_cell",
-]
-
-[[package]]
-name = "is-wsl"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "173609498df190136aa7dea1a91db051746d339e18476eed5ca40521f02d7aa5"
-dependencies = [
- "is-docker",
- "once_cell",
-]
-
 [[package]]
 name = "itoa"
 version = "1.0.18"
@@ -1716,7 +1678,6 @@ dependencies = [
  "tauri",
  "tauri-build",
  "tauri-plugin-dialog",
- "tauri-plugin-shell",
 ]
 
 [[package]]
@@ -2126,34 +2087,12 @@ version = "1.21.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9f7c3e4beb33f85d45ae3e3a1792185706c8e16d043238c593331cc7cd313b50"
 
-[[package]]
-name = "open"
-version = "5.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "43bb73a7fa3799b198970490a51174027ba0d4ec504b03cd08caf513d40024bc"
-dependencies = [
- "dunce",
- "is-wsl",
- "libc",
- "pathdiff",
-]
-
 [[package]]
 name = "option-ext"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "04744f49eae99ab78e0d5c0b603ab218f515ea8cfe5a456d7629ad883a3b6e7d"
 
-[[package]]
-name = "os_pipe"
-version = "1.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7d8fae84b431384b68627d0f9b3b1245fcf9f46f6c0e3dc902e9dce64edd1967"
-dependencies = [
- "libc",
- "windows-sys 0.61.2",
-]
-
 [[package]]
 name = "pango"
 version = "0.18.3"
@@ -2202,12 +2141,6 @@ dependencies = [
  "windows-link 0.2.1",
 ]
 
-[[package]]
-name = "pathdiff"
-version = "0.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "df94ce210e5bc13cb6651479fa48d14f601d9858cfe0467f43ae157023b938d3"
-
 [[package]]
 name = "percent-encoding"
 version = "2.3.2"
@@ -3103,54 +3036,12 @@ dependencies = [
  "digest",
 ]
 
-[[package]]
-name = "shared_child"
-version = "1.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e362d9935bc50f019969e2f9ecd66786612daae13e8f277be7bfb66e8bed3f7"
-dependencies = [
- "libc",
- "sigchld",
- "windows-sys 0.60.2",
-]
-
 [[package]]
 name = "shlex"
 version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
 
-[[package]]
-name = "sigchld"
-version = "0.2.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "47106eded3c154e70176fc83df9737335c94ce22f821c32d17ed1db1f83badb1"
-dependencies = [
- "libc",
- "os_pipe",
- "signal-hook",
-]
-
-[[package]]
-name = "signal-hook"
-version = "0.3.18"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d881a16cf4426aa584979d30bd82cb33429027e42122b169753d6ef1085ed6e2"
-dependencies = [
- "libc",
- "signal-hook-registry",
-]
-
-[[package]]
-name = "signal-hook-registry"
-version = "1.4.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c4db69cba1110affc0e9f7bcd48bbf87b3f4fc7c61fc9155afd4c469eb3d6c1b"
-dependencies = [
- "errno",
- "libc",
-]
-
 [[package]]
 name = "simd-adler32"
 version = "0.3.9"
@@ -3592,27 +3483,6 @@ dependencies = [
  "url",
 ]
 
-[[package]]
-name = "tauri-plugin-shell"
-version = "2.3.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8457dbf9e2bab1edd8df22bb2c20857a59a9868e79cb3eac5ed639eec4d0c73b"
-dependencies = [
- "encoding_rs",
- "log",
- "open",
- "os_pipe",
- "regex",
- "schemars 0.8.22",
- "serde",
- "serde_json",
- "shared_child",
- "tauri",
- "tauri-plugin",
- "thiserror 2.0.18",
- "tokio",
-]
-
 [[package]]
 name = "tauri-runtime"
 version = "2.10.1"
diff --git a/src-tauri/Cargo.toml b/src-tauri/Cargo.toml
index 1433353..7ff0c0c 100644
--- a/src-tauri/Cargo.toml
+++ b/src-tauri/Cargo.toml
@@ -12,7 +12,6 @@ tauri-build = { version = "2", features = [] }
 [dependencies]
 kopdeltav = { path = "crates/kopdeltav" }
 tauri = { version = "2", features = [] }
-tauri-plugin-shell = "2"
 tauri-plugin-dialog = "2"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
diff --git a/src-tauri/src/commands.rs b/src-tauri/src/commands.rs
new file mode 100644
index 0000000..4b686d6
--- /dev/null
+++ b/src-tauri/src/commands.rs
@@ -0,0 +1,693 @@
+//! Tauri command handlers that bridge the frontend to the kopdeltav crate.
+//!
+//! Each command locks the shared `ManagedState`, delegates to kopdeltav functions,
+//! and returns `Result<T, String>` for Tauri IPC compatibility.
+//!
+//! Tauri コマンドハンドラ。フロントエンドと kopdeltav クレートの橋渡し。
+
+use serde::Serialize;
+use std::collections::HashMap;
+
+use kopdeltav::calculator::{
+    calculate_hohmann, calculate_launch, calculate_tsiolkovsky, circular_velocity, compute_route,
+    density_at_altitude, escape_dv_from_low_orbit, geostationary_altitude, geostationary_dv,
+    landing_dv, low_orbit_altitude, surface_density,
+};
+use kopdeltav::models::{hermite_interp, CelestialBody};
+use kopdeltav::parser::parse_bodies;
+use kopdeltav::system::{build_tree, scan_configs, sort_by_transfer_dv};
+
+use crate::state::ManagedState;
+
+// ---------------------------------------------------------------------------
+// Response types
+// ---------------------------------------------------------------------------
+
+/// Summary representation of a celestial body for list views.
+#[derive(Serialize)]
+pub struct BodySummary {
+    pub name: String,
+    pub display_name: String,
+    pub radius: f64,
+    pub gee_asl: f64,
+    pub has_atmosphere: bool,
+    pub has_ocean: bool,
+}
+
+/// Orbital elements response matching TypeScript interfaces.
+#[derive(Serialize)]
+pub struct OrbitResponse {
+    pub semi_major_axis: f64,
+    pub eccentricity: f64,
+    pub inclination: f64,
+    pub argument_of_periapsis: f64,
+    pub longitude_of_ascending_node: f64,
+    pub mean_anomaly_at_epoch: f64,
+    pub epoch: f64,
+}
+
+/// Atmosphere summary response.
+#[derive(Serialize)]
+pub struct AtmosphereResponse {
+    pub atmosphere_depth: f64,
+    pub pressure_at_sea_level: f64,
+    pub temperature_at_sea_level: f64,
+    pub molar_mass: f64,
+    pub adiabatic_index: f64,
+    pub sea_level_density: Option<f64>,
+}
+
+/// Detailed celestial body response.
+#[derive(Serialize)]
+pub struct BodyDetail {
+    pub name: String,
+    pub display_name: String,
+    pub radius: f64,
+    pub gee_asl: f64,
+    pub mu: f64,
+    pub has_ocean: bool,
+    pub rotational_period: f64,
+    pub soi: f64,
+    pub atmosphere: Option<AtmosphereResponse>,
+    pub orbit: Option<OrbitResponse>,
+}
+
+/// Launch-to-orbit calculation response.
+#[derive(Serialize)]
+pub struct LaunchResponse {
+    pub orbital_velocity: f64,
+    pub gravity_loss: f64,
+    pub drag_loss: f64,
+    pub total_ideal: f64,
+    pub total_rocket: f64,
+    pub jet_savings: f64,
+    pub total_with_jets: f64,
+}
+
+/// Hohmann transfer calculation response.
+#[derive(Serialize)]
+pub struct HohmannResponse {
+    pub departure_dv: f64,
+    pub arrival_dv: f64,
+    pub total_dv: f64,
+    pub transfer_time: f64,
+    pub inward: bool,
+}
+
+/// Tsiolkovsky equation response.
+#[derive(Serialize)]
+pub struct TsiolkovskyResponse {
+    pub mass_ratio: f64,
+    pub fuel_fraction: f64,
+    pub dry_mass: f64,
+    pub fuel_mass: f64,
+}
+
+/// Config upload/scan result.
+#[derive(Serialize)]
+pub struct UploadResponse {
+    pub bodies_added: Vec<String>,
+    pub count: usize,
+}
+
+/// A node in the celestial body tree for hierarchical display.
+#[derive(Serialize)]
+pub struct BodyTreeNode {
+    pub name: String,
+    pub display_name: String,
+    pub children: Vec<BodyTreeNode>,
+}
+
+/// Full celestial system response.
+#[derive(Serialize)]
+pub struct SystemResponse {
+    pub root: BodySummary,
+    pub home_world: BodyDetail,
+    pub body_count: usize,
+    pub tree: Vec<BodyTreeNode>,
+}
+
+/// A destination body with its transfer delta-V.
+#[derive(Serialize)]
+pub struct DestinationEntry {
+    pub body: BodySummary,
+    pub transfer_dv: f64,
+}
+
+/// A single step in a delta-V route.
+#[derive(Serialize)]
+pub struct DvStepResponse {
+    pub label: String,
+    pub dv: f64,
+    pub cumulative: f64,
+    pub note: String,
+}
+
+/// Full route response.
+#[derive(Serialize)]
+pub struct RouteResponse {
+    pub steps: Vec<DvStepResponse>,
+    pub total_powered: f64,
+    pub total_aerobrake: Option<f64>,
+}
+
+/// Atmosphere profile sampled at regular altitude intervals.
+#[derive(Serialize)]
+pub struct AtmoProfileResponse {
+    pub altitude: Vec<f64>,
+    pub pressure: Vec<f64>,
+    pub temperature: Vec<f64>,
+    pub density: Vec<f64>,
+}
+
+// ---------------------------------------------------------------------------
+// Conversion helpers
+// ---------------------------------------------------------------------------
+
+/// Convert a `CelestialBody` to a `BodySummary`.
+fn body_to_summary(body: &CelestialBody) -> BodySummary {
+    BodySummary {
+        name: body.name.clone(),
+        display_name: body.display_name.clone(),
+        radius: body.radius,
+        gee_asl: body.gee_asl,
+        has_atmosphere: body.has_atmosphere(),
+        has_ocean: body.has_ocean,
+    }
+}
+
+/// Convert a `CelestialBody` to a `BodyDetail`.
+fn body_to_detail(body: &CelestialBody) -> BodyDetail {
+    let atmosphere = body.atmosphere.as_ref().map(|atmo| {
+        let sea_level_density = surface_density(body);
+        AtmosphereResponse {
+            atmosphere_depth: atmo.atmosphere_depth,
+            pressure_at_sea_level: atmo.pressure_at_sea_level,
+            temperature_at_sea_level: atmo.temperature_at_sea_level,
+            molar_mass: atmo.molar_mass,
+            adiabatic_index: atmo.adiabatic_index,
+            sea_level_density,
+        }
+    });
+
+    let orbit = body.orbit.as_ref().map(|o| OrbitResponse {
+        semi_major_axis: o.semi_major_axis,
+        eccentricity: o.eccentricity,
+        inclination: o.inclination,
+        argument_of_periapsis: o.argument_of_periapsis,
+        longitude_of_ascending_node: o.longitude_of_ascending_node,
+        mean_anomaly_at_epoch: o.mean_anomaly_at_epoch,
+        epoch: o.epoch,
+    });
+
+    BodyDetail {
+        name: body.name.clone(),
+        display_name: body.display_name.clone(),
+        radius: body.radius,
+        gee_asl: body.gee_asl,
+        mu: body.mu,
+        has_ocean: body.has_ocean,
+        rotational_period: body.rotational_period,
+        soi: body.soi,
+        atmosphere,
+        orbit,
+    }
+}
+
+/// Build a tree node recursively from the body map.
+fn build_tree_node(name: &str, bodies: &HashMap<String, CelestialBody>) -> Option<BodyTreeNode> {
+    let body = bodies.get(name)?;
+    let children = body
+        .children_names
+        .iter()
+        .filter_map(|child_name| build_tree_node(child_name, bodies))
+        .collect();
+    Some(BodyTreeNode {
+        name: body.name.clone(),
+        display_name: body.display_name.clone(),
+        children,
+    })
+}
+
+/// Try to rebuild the system tree from current bodies and store it in state.
+/// Returns the list of body names added.
+fn rebuild_system(
+    bodies: &HashMap<String, CelestialBody>,
+) -> Option<kopdeltav::system::CelestialSystem> {
+    if bodies.is_empty() {
+        return None;
+    }
+    let body_list: Vec<CelestialBody> = bodies.values().cloned().collect();
+    build_tree(body_list).ok()
+}
+
+// ---------------------------------------------------------------------------
+// Commands
+// ---------------------------------------------------------------------------
+
+/// Health check endpoint.
+#[tauri::command]
+pub fn health() -> serde_json::Value {
+    serde_json::json!({"status": "ok"})
+}
+
+/// Upload and parse a Kopernicus config string, adding bodies to state.
+#[tauri::command]
+pub fn upload_config(
+    file_content: String,
+    state: tauri::State<'_, ManagedState>,
+) -> Result<UploadResponse, String> {
+    let mut app = state.lock().map_err(|e| e.to_string())?;
+    let parsed = parse_bodies(&file_content);
+    if parsed.is_empty() {
+        return Err("No celestial bodies found in config".to_string());
+    }
+
+    let mut added: Vec<String> = Vec::new();
+    for body in parsed {
+        added.push(body.name.clone());
+        app.bodies.insert(body.name.clone(), body);
+    }
+
+    // Try rebuilding the system tree
+    app.system = rebuild_system(&app.bodies);
+
+    let count = added.len();
+    Ok(UploadResponse {
+        bodies_added: added,
+        count,
+    })
+}
+
+/// Scan a GameData directory for Kopernicus configs and replace state entirely.
+#[tauri::command]
+pub fn scan_gamedata(
+    path: String,
+    exclude: Vec<String>,
+    state: tauri::State<'_, ManagedState>,
+) -> Result<UploadResponse, String> {
+    let system = scan_configs(&path, &exclude)?;
+
+    let added: Vec<String> = system.bodies.keys().cloned().collect();
+    let count = added.len();
+
+    let mut app = state.lock().map_err(|e| e.to_string())?;
+    app.bodies = system.bodies.clone();
+    app.system = Some(system);
+
+    Ok(UploadResponse {
+        bodies_added: added,
+        count,
+    })
+}
+
+/// List all loaded celestial bodies as summaries.
+#[tauri::command]
+pub fn list_bodies(
+    _lang: Option<String>,
+    state: tauri::State<'_, ManagedState>,
+) -> Result<Vec<BodySummary>, String> {
+    let app = state.lock().map_err(|e| e.to_string())?;
+    let mut summaries: Vec<BodySummary> = app.bodies.values().map(body_to_summary).collect();
+    summaries.sort_by(|a, b| a.name.cmp(&b.name));
+    Ok(summaries)
+}
+
+/// Get detailed information for a specific celestial body.
+#[tauri::command]
+pub fn get_body(
+    name: String,
+    _lang: Option<String>,
+    state: tauri::State<'_, ManagedState>,
+) -> Result<BodyDetail, String> {
+    let app = state.lock().map_err(|e| e.to_string())?;
+    let body = app
+        .bodies
+        .get(&name)
+        .ok_or_else(|| format!("Body not found: {}", name))?;
+    Ok(body_to_detail(body))
+}
+
+/// Calculate launch-to-orbit delta-V for a body.
+#[tauri::command]
+pub fn calc_launch(
+    body_name: String,
+    target_altitude: f64,
+    state: tauri::State<'_, ManagedState>,
+) -> Result<LaunchResponse, String> {
+    let app = state.lock().map_err(|e| e.to_string())?;
+    let body = app
+        .bodies
+        .get(&body_name)
+        .ok_or_else(|| format!("Body not found: {}", body_name))?;
+
+    if target_altitude < 0.0 {
+        return Err("Target altitude must be non-negative".to_string());
+    }
+
+    let result = calculate_launch(body, target_altitude);
+    Ok(LaunchResponse {
+        orbital_velocity: result.orbital_velocity,
+        gravity_loss: result.gravity_loss,
+        drag_loss: result.drag_loss,
+        total_ideal: result.total_ideal,
+        total_rocket: result.total_rocket,
+        jet_savings: result.jet_savings,
+        total_with_jets: result.total_with_jets,
+    })
+}
+
+/// Calculate Hohmann transfer delta-V.
+#[tauri::command]
+pub fn calc_hohmann(
+    body_name: String,
+    parking_alt: f64,
+    target_sma: f64,
+    state: tauri::State<'_, ManagedState>,
+) -> Result<HohmannResponse, String> {
+    let app = state.lock().map_err(|e| e.to_string())?;
+    let body = app
+        .bodies
+        .get(&body_name)
+        .ok_or_else(|| format!("Body not found: {}", body_name))?;
+
+    if parking_alt < 0.0 {
+        return Err("Parking altitude must be non-negative".to_string());
+    }
+
+    let r_parking = body.radius + parking_alt;
+    if (r_parking - target_sma).abs() / r_parking.max(target_sma) < 1e-12 {
+        return Err("Parking orbit and target SMA are identical".to_string());
+    }
+
+    let result = calculate_hohmann(body, parking_alt, target_sma);
+    Ok(HohmannResponse {
+        departure_dv: result.departure_dv,
+        arrival_dv: result.arrival_dv,
+        total_dv: result.total_dv,
+        transfer_time: result.transfer_time,
+        inward: result.inward,
+    })
+}
+
+/// Apply the Tsiolkovsky rocket equation.
+#[tauri::command]
+pub fn calc_tsiolkovsky(
+    delta_v: f64,
+    isp: f64,
+    wet_mass: f64,
+) -> Result<TsiolkovskyResponse, String> {
+    if delta_v < 0.0 {
+        return Err("delta_v must be non-negative".to_string());
+    }
+    if isp <= 0.0 {
+        return Err("Isp must be positive".to_string());
+    }
+    if wet_mass <= 0.0 {
+        return Err("Wet mass must be positive".to_string());
+    }
+
+    let result = calculate_tsiolkovsky(delta_v, isp, wet_mass);
+    Ok(TsiolkovskyResponse {
+        mass_ratio: result.mass_ratio,
+        fuel_fraction: result.fuel_fraction,
+        dry_mass: result.dry_mass,
+        fuel_mass: result.fuel_mass,
+    })
+}
+
+/// Get the full celestial system tree.
+#[tauri::command]
+pub fn get_system(
+    state: tauri::State<'_, ManagedState>,
+) -> Result<SystemResponse, String> {
+    let app = state.lock().map_err(|e| e.to_string())?;
+    let system = app
+        .system
+        .as_ref()
+        .ok_or_else(|| "No system loaded. Upload a config or scan GameData first.".to_string())?;
+
+    let root_body = system
+        .bodies
+        .get(&system.root_name)
+        .ok_or_else(|| format!("Root body '{}' not found in system", system.root_name))?;
+
+    let home_body = system
+        .bodies
+        .get(&system.home_world_name)
+        .ok_or_else(|| {
+            format!(
+                "Home world '{}' not found in system",
+                system.home_world_name
+            )
+        })?;
+
+    let tree = root_body
+        .children_names
+        .iter()
+        .filter_map(|child_name| build_tree_node(child_name, &system.bodies))
+        .collect();
+
+    Ok(SystemResponse {
+        root: body_to_summary(root_body),
+        home_world: body_to_detail(home_body),
+        body_count: system.bodies.len(),
+        tree,
+    })
+}
+
+/// Get sibling bodies sorted by transfer delta-V from the home world.
+#[tauri::command]
+pub fn get_destinations(
+    state: tauri::State<'_, ManagedState>,
+) -> Result<Vec<DestinationEntry>, String> {
+    let app = state.lock().map_err(|e| e.to_string())?;
+    let system = app
+        .system
+        .as_ref()
+        .ok_or_else(|| "No system loaded".to_string())?;
+
+    let sorted = sort_by_transfer_dv(&system.home_world_name, &system.bodies);
+
+    let entries = sorted
+        .into_iter()
+        .filter_map(|(name, dv)| {
+            let body = system.bodies.get(&name)?;
+            Some(DestinationEntry {
+                body: body_to_summary(body),
+                transfer_dv: dv,
+            })
+        })
+        .collect();
+
+    Ok(entries)
+}
+
+/// Compute a delta-V route from home to an optional destination and moon.
+#[tauri::command]
+pub fn calc_route(
+    destination: Option<String>,
+    moon: Option<String>,
+    state: tauri::State<'_, ManagedState>,
+) -> Result<RouteResponse, String> {
+    let app = state.lock().map_err(|e| e.to_string())?;
+    let system = app
+        .system
+        .as_ref()
+        .ok_or_else(|| "No system loaded".to_string())?;
+
+    let home = system
+        .bodies
+        .get(&system.home_world_name)
+        .ok_or_else(|| "Home world not found in system".to_string())?;
+
+    let parent_name = home
+        .parent_name
+        .as_ref()
+        .ok_or_else(|| "Home world has no parent body".to_string())?;
+
+    let parent = system
+        .bodies
+        .get(parent_name)
+        .ok_or_else(|| format!("Parent body '{}' not found", parent_name))?;
+
+    let dest_body = match &destination {
+        Some(name) => Some(
+            system
+                .bodies
+                .get(name)
+                .ok_or_else(|| format!("Destination body '{}' not found", name))?,
+        ),
+        None => None,
+    };
+
+    let moon_body = match &moon {
+        Some(name) => Some(
+            system
+                .bodies
+                .get(name)
+                .ok_or_else(|| format!("Moon '{}' not found", name))?,
+        ),
+        None => None,
+    };
+
+    let steps = compute_route(home, parent, dest_body, moon_body);
+
+    let total_powered = steps.last().map(|s| s.cumulative).unwrap_or(0.0);
+
+    // Check if any step has an aerobrake note
+    let has_aerobrake = steps.iter().any(|s| s.note.contains("aerobrake"));
+    let total_aerobrake = if has_aerobrake {
+        // Aerobrake landing replaces the last powered landing step
+        let last_landing_dv = steps
+            .iter()
+            .rev()
+            .find(|s| s.note.contains("aerobrake"))
+            .map(|s| s.dv)
+            .unwrap_or(0.0);
+        Some(total_powered - last_landing_dv)
+    } else {
+        None
+    };
+
+    let step_responses = steps
+        .into_iter()
+        .map(|s| DvStepResponse {
+            label: s.label,
+            dv: s.dv,
+            cumulative: s.cumulative,
+            note: s.note,
+        })
+        .collect();
+
+    Ok(RouteResponse {
+        steps: step_responses,
+        total_powered,
+        total_aerobrake,
+    })
+}
+
+/// Get an atmosphere profile sampled at regular altitude intervals.
+#[tauri::command]
+pub fn get_atmo_profile(
+    name: String,
+    steps: Option<u32>,
+    state: tauri::State<'_, ManagedState>,
+) -> Result<AtmoProfileResponse, String> {
+    let app = state.lock().map_err(|e| e.to_string())?;
+    let body = app
+        .bodies
+        .get(&name)
+        .ok_or_else(|| format!("Body not found: {}", name))?;
+
+    let atmo = body
+        .atmosphere
+        .as_ref()
+        .ok_or_else(|| format!("Body '{}' has no atmosphere", name))?;
+
+    let n_steps = steps.unwrap_or(100) as usize;
+    if n_steps == 0 {
+        return Err("Steps must be positive".to_string());
+    }
+
+    let depth = atmo.atmosphere_depth;
+    let step_size = depth / n_steps as f64;
+
+    let mut altitudes = Vec::with_capacity(n_steps + 1);
+    let mut pressures = Vec::with_capacity(n_steps + 1);
+    let mut temperatures = Vec::with_capacity(n_steps + 1);
+    let mut densities = Vec::with_capacity(n_steps + 1);
+
+    for i in 0..=n_steps {
+        let alt = step_size * i as f64;
+        altitudes.push(alt);
+
+        let pressure = if !atmo.pressure_curve.is_empty() {
+            hermite_interp(&atmo.pressure_curve, alt).unwrap_or(0.0)
+        } else if alt == 0.0 {
+            atmo.pressure_at_sea_level
+        } else {
+            0.0
+        };
+        pressures.push(pressure);
+
+        let temperature = if !atmo.temperature_curve.is_empty() {
+            hermite_interp(&atmo.temperature_curve, alt).unwrap_or(0.0)
+        } else if alt == 0.0 {
+            atmo.temperature_at_sea_level
+        } else {
+            0.0
+        };
+        temperatures.push(temperature);
+
+        let density = density_at_altitude(body, alt).unwrap_or(0.0);
+        densities.push(density);
+    }
+
+    Ok(AtmoProfileResponse {
+        altitude: altitudes,
+        pressure: pressures,
+        temperature: temperatures,
+        density: densities,
+    })
+}
+
+/// Get moons of a body sorted by transfer delta-V.
+#[tauri::command]
+pub fn get_body_moons(
+    name: String,
+    state: tauri::State<'_, ManagedState>,
+) -> Result<Vec<DestinationEntry>, String> {
+    let app = state.lock().map_err(|e| e.to_string())?;
+    let system = app
+        .system
+        .as_ref()
+        .ok_or_else(|| "No system loaded".to_string())?;
+
+    let body = system
+        .bodies
+        .get(&name)
+        .ok_or_else(|| format!("Body not found: {}", name))?;
+
+    if body.children_names.is_empty() {
+        return Ok(Vec::new());
+    }
+
+    // Use sort_by_transfer_dv from the home world perspective if
+    // this body is a planet. For moons, we look at children of this body
+    // and compute transfers from the body's low orbit.
+    let lo_alt = low_orbit_altitude(body);
+
+    let mut entries: Vec<DestinationEntry> = Vec::new();
+    for child_name in &body.children_names {
+        let child = match system.bodies.get(child_name) {
+            Some(c) => c,
+            None => continue,
+        };
+        let child_orbit = match &child.orbit {
+            Some(o) => o,
+            None => continue,
+        };
+        let target_sma = child_orbit.semi_major_axis;
+        let r_parking = body.radius + lo_alt;
+
+        // Skip if radii are too close (would panic in calculate_hohmann)
+        if (r_parking - target_sma).abs() / r_parking.max(target_sma) < 1e-12 {
+            continue;
+        }
+
+        let hohmann = calculate_hohmann(body, lo_alt, target_sma);
+        entries.push(DestinationEntry {
+            body: body_to_summary(child),
+            transfer_dv: hohmann.total_dv,
+        });
+    }
+
+    entries.sort_by(|a, b| {
+        a.transfer_dv
+            .partial_cmp(&b.transfer_dv)
+            .unwrap_or(std::cmp::Ordering::Equal)
+    });
+
+    Ok(entries)
+}
diff --git a/src-tauri/src/main.rs b/src-tauri/src/main.rs
index 0875a1a..1b48778 100644
--- a/src-tauri/src/main.rs
+++ b/src-tauri/src/main.rs
@@ -1,50 +1,29 @@
 #![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
 
-use tauri::Manager;
-use tauri_plugin_shell::ShellExt;
+use std::sync::Mutex;
+
+mod commands;
+mod state;
 
 fn main() {
     tauri::Builder::default()
-        .plugin(tauri_plugin_shell::init())
         .plugin(tauri_plugin_dialog::init())
-        .setup(|app| {
-            let shell = app.shell();
-
-            // In dev mode, api.py is at the project root (../../api.py from src-tauri/)
-            // In production, resources are bundled next to the exe
-            let resource_dir = app
-                .path()
-                .resource_dir()
-                .expect("Failed to resolve resource directory");
-
-            let api_path = resource_dir.join("api.py");
-
-            let (mut rx, _child) = shell
-                .command("python")
-                .args([api_path.to_string_lossy().to_string()])
-                .current_dir(&resource_dir)
-                .spawn()
-                .expect("Failed to spawn Python API server");
-
-            tauri::async_runtime::spawn(async move {
-                while let Some(event) = rx.recv().await {
-                    match event {
-                        tauri_plugin_shell::process::CommandEvent::Stdout(line) => {
-                            println!("[python:stdout] {}", String::from_utf8_lossy(&line));
-                        }
-                        tauri_plugin_shell::process::CommandEvent::Stderr(line) => {
-                            eprintln!("[python:stderr] {}", String::from_utf8_lossy(&line));
-                        }
-                        tauri_plugin_shell::process::CommandEvent::Terminated(status) => {
-                            eprintln!("[python] Process terminated: {:?}", status);
-                        }
-                        _ => {}
-                    }
-                }
-            });
-
-            Ok(())
-        })
+        .manage(Mutex::new(state::AppState::new()))
+        .invoke_handler(tauri::generate_handler![
+            commands::health,
+            commands::upload_config,
+            commands::scan_gamedata,
+            commands::list_bodies,
+            commands::get_body,
+            commands::calc_launch,
+            commands::calc_hohmann,
+            commands::calc_tsiolkovsky,
+            commands::get_system,
+            commands::get_destinations,
+            commands::calc_route,
+            commands::get_atmo_profile,
+            commands::get_body_moons,
+        ])
         .run(tauri::generate_context!())
         .expect("error while running tauri application");
 }
diff --git a/src-tauri/src/state.rs b/src-tauri/src/state.rs
new file mode 100644
index 0000000..33003c2
--- /dev/null
+++ b/src-tauri/src/state.rs
@@ -0,0 +1,32 @@
+//! Application state shared across Tauri commands.
+//!
+//! Tauri コマンド間で共有するアプリケーション状態。
+
+use std::collections::HashMap;
+use std::sync::Mutex;
+
+use kopdeltav::models::CelestialBody;
+use kopdeltav::system::CelestialSystem;
+
+/// Central application state holding parsed celestial bodies and the built system tree.
+///
+/// パース済み天体とシステムツリーを保持する中央アプリケーション状態。
+pub struct AppState {
+    /// All loaded celestial bodies indexed by internal name.
+    pub bodies: HashMap<String, CelestialBody>,
+    /// The fully linked celestial system tree, built after loading bodies.
+    pub system: Option<CelestialSystem>,
+}
+
+impl AppState {
+    /// Create a new empty state with no bodies loaded.
+    pub fn new() -> Self {
+        Self {
+            bodies: HashMap::new(),
+            system: None,
+        }
+    }
+}
+
+/// Thread-safe wrapper around `AppState` for Tauri managed state.
+pub type ManagedState = Mutex<AppState>;
diff --git a/src-tauri/tauri.conf.json b/src-tauri/tauri.conf.json
index 1e6d476..f9fca1c 100644
--- a/src-tauri/tauri.conf.json
+++ b/src-tauri/tauri.conf.json
@@ -20,16 +20,8 @@
       }
     ],
     "security": {
-      "csp": "default-src 'self'; connect-src 'self' http://localhost:8000; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; font-src 'self' https://fonts.gstatic.com; img-src 'self' data:"
+      "csp": "default-src 'self'; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; font-src 'self' https://fonts.gstatic.com; img-src 'self' data:"
     }
   },
-  "bundle": {
-    "resources": {
-      "../api.py": ".",
-      "../kopdeltav": "kopdeltav",
-      "../run.py": ".",
-      "../pyproject.toml": ".",
-      "../sample_configs": "sample_configs"
-    }
-  }
+  "bundle": {}
 }

From c1305d3d855f0819ce17861ced67f51e49c47c4f Mon Sep 17 00:00:00 2001
From: Yumeno Yuuka <sounyan.is.the.angel@gmail.com>
Date: Fri, 3 Apr 2026 09:56:24 +0900
Subject: [PATCH 6/8] feat(frontend): replace fetch API with Tauri invoke
 commands

Migrate all HTTP fetch-based API calls in useApi.ts to Tauri invoke()
from @tauri-apps/api/core, update ConfigUpload.vue to read file as text
before passing to invoke, and remove the vite dev server proxy config.
---
 .../src/components/upload/ConfigUpload.vue    |   3 +-
 frontend/src/composables/useApi.ts            | 100 ++++++++----------
 frontend/vite.config.ts                       |   7 --
 3 files changed, 44 insertions(+), 66 deletions(-)

diff --git a/frontend/src/components/upload/ConfigUpload.vue b/frontend/src/components/upload/ConfigUpload.vue
index da0e751..905ce93 100644
--- a/frontend/src/components/upload/ConfigUpload.vue
+++ b/frontend/src/components/upload/ConfigUpload.vue
@@ -30,7 +30,8 @@ async function onFileSelect(event: FileUploadSelectEvent): Promise<void> {
 
   uploading.value = true
   try {
-    const uploadResult = await api.uploadConfig(file)
+    const fileContent = await file.text()
+    const uploadResult = await api.uploadConfig(fileContent)
     await afterSuccess(uploadResult.count)
   } catch (err) {
     toast.add({
diff --git a/frontend/src/composables/useApi.ts b/frontend/src/composables/useApi.ts
index 348e5fd..0924ba9 100644
--- a/frontend/src/composables/useApi.ts
+++ b/frontend/src/composables/useApi.ts
@@ -1,91 +1,75 @@
+import { invoke } from '@tauri-apps/api/core'
 import { useToast } from 'primevue/usetoast'
 import type {
   AtmoProfileResponse,
   BodyDetail,
   BodySummary,
+  DestinationEntry,
   HealthResponse,
-  HohmannRequest,
   HohmannResponse,
-  LaunchRequest,
   LaunchResponse,
-  RouteRequest,
   RouteResponse,
   ScanRequest,
   SystemResponse,
-  TsiolkovskyRequest,
   TsiolkovskyResponse,
   UploadResponse,
-  DestinationEntry,
 } from '@/types/api'
 
-const BASE_URL = import.meta.env.DEV ? '/api' : 'http://localhost:8000'
-
-async function request<T>(
-  path: string,
-  options: RequestInit = {},
-  lang?: string,
-): Promise<T> {
-  const url = new URL(`${BASE_URL}${path}`, window.location.origin)
-  if (lang) {
-    url.searchParams.set('lang', lang)
-  }
-  const response = await fetch(url.toString(), {
-    headers: { 'Content-Type': 'application/json', ...options.headers },
-    ...options,
-  })
-  if (!response.ok) {
-    const body = await response.json().catch(() => ({ detail: response.statusText }))
-    throw new Error(body.detail ?? `HTTP ${response.status}`)
-  }
-  return response.json() as Promise<T>
-}
-
 export function useApi(lang?: string) {
   const toast = useToast()
 
   function handleError(err: unknown): void {
     const message = err instanceof Error ? err.message : String(err)
-    toast.add({ severity: 'error', summary: 'API Error', detail: message, life: 5000 })
+    toast.add({ severity: 'error', summary: 'Error', detail: message, life: 5000 })
   }
 
   return {
-    health: () => request<HealthResponse>('/health'),
-    listBodies: () => request<BodySummary[]>('/bodies', {}, lang),
-    getBody: (name: string) => request<BodyDetail>(`/bodies/${encodeURIComponent(name)}`, {}, lang),
+    health: () => invoke<HealthResponse>('health'),
+    listBodies: () => invoke<BodySummary[]>('list_bodies', { lang }),
+    getBody: (name: string) => invoke<BodyDetail>('get_body', { name, lang }),
     getBodyMoons: (name: string) =>
-      request<DestinationEntry[]>(`/bodies/${encodeURIComponent(name)}/moons`),
+      invoke<DestinationEntry[]>('get_body_moons', { name }),
 
-    uploadConfig: async (file: File) => {
-      const formData = new FormData()
-      formData.append('file', file)
-      const url = `${BASE_URL}/upload-config${lang ? `?lang=${lang}` : ''}`
-      const response = await fetch(url, { method: 'POST', body: formData })
-      if (!response.ok) {
-        const body = await response.json().catch(() => ({ detail: response.statusText }))
-        throw new Error(body.detail ?? `HTTP ${response.status}`)
-      }
-      return response.json() as Promise<UploadResponse>
-    },
+    uploadConfig: (fileContent: string) =>
+      invoke<UploadResponse>('upload_config', { fileContent }),
 
     scan: (req: ScanRequest) =>
-      request<UploadResponse>('/scan', { method: 'POST', body: JSON.stringify(req) }),
+      invoke<UploadResponse>('scan_gamedata', {
+        path: req.gamedata_path,
+        exclude: req.exclude_dirs,
+      }),
+
+    calcLaunch: (req: { body_name: string; target_altitude: number }) =>
+      invoke<LaunchResponse>('calc_launch', {
+        bodyName: req.body_name,
+        targetAltitude: req.target_altitude,
+      }),
+
+    calcHohmann: (req: { body_name: string; parking_altitude: number; target_sma: number }) =>
+      invoke<HohmannResponse>('calc_hohmann', {
+        bodyName: req.body_name,
+        parkingAlt: req.parking_altitude,
+        targetSma: req.target_sma,
+      }),
+
+    calcTsiolkovsky: (req: { delta_v: number; isp: number; wet_mass: number }) =>
+      invoke<TsiolkovskyResponse>('calc_tsiolkovsky', {
+        deltaV: req.delta_v,
+        isp: req.isp,
+        wetMass: req.wet_mass,
+      }),
 
-    calcLaunch: (req: LaunchRequest) =>
-      request<LaunchResponse>('/calc/launch', { method: 'POST', body: JSON.stringify(req) }, lang),
-    calcHohmann: (req: HohmannRequest) =>
-      request<HohmannResponse>('/calc/hohmann', { method: 'POST', body: JSON.stringify(req) }, lang),
-    calcTsiolkovsky: (req: TsiolkovskyRequest) =>
-      request<TsiolkovskyResponse>('/calc/tsiolkovsky', { method: 'POST', body: JSON.stringify(req) }, lang),
+    getSystem: () => invoke<SystemResponse>('get_system'),
+    getDestinations: () => invoke<DestinationEntry[]>('get_destinations'),
 
-    getSystem: () => request<SystemResponse>('/system'),
-    getDestinations: () => request<DestinationEntry[]>('/system/destinations'),
-    calcRoute: (req: RouteRequest) =>
-      request<RouteResponse>('/calc/route', { method: 'POST', body: JSON.stringify(req) }),
+    calcRoute: (req: { destination: string | null; moon: string | null }) =>
+      invoke<RouteResponse>('calc_route', {
+        destination: req.destination,
+        moon: req.moon,
+      }),
 
-    getAtmoProfile: (name: string, steps?: number) => {
-      const params = steps ? `?steps=${steps}` : ''
-      return request<AtmoProfileResponse>(`/atmo-profile/${encodeURIComponent(name)}${params}`, {}, lang)
-    },
+    getAtmoProfile: (name: string, steps?: number) =>
+      invoke<AtmoProfileResponse>('get_atmo_profile', { name, steps }),
 
     handleError,
   }
diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts
index 0e77346..a8e91e2 100644
--- a/frontend/vite.config.ts
+++ b/frontend/vite.config.ts
@@ -11,12 +11,5 @@ export default defineConfig({
   },
   server: {
     port: 5173,
-    proxy: {
-      '/api': {
-        target: 'http://localhost:8000',
-        changeOrigin: true,
-        rewrite: (path) => path.replace(/^\/api/, ''),
-      },
-    },
   },
 })

From 2a9626a9115471d4d1cd0b7b5488ded7dbb4a937 Mon Sep 17 00:00:00 2001
From: Yumeno Yuuka <sounyan.is.the.angel@gmail.com>
Date: Fri, 3 Apr 2026 09:57:24 +0900
Subject: [PATCH 7/8] ci: add Rust tests to CI, update release description

---
 .github/workflows/ci.yml      | 13 +++++++++++++
 .github/workflows/release.yml |  2 +-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 01b0768..a0c82f1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -34,6 +34,19 @@ jobs:
       - name: Tests
         run: pytest tests/ -v
 
+  rust:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: swatinem/rust-cache@v2
+        with:
+          workspaces: src-tauri -> target
+      - name: Run tests
+        run: cargo test -p kopdeltav --manifest-path src-tauri/Cargo.toml
+      - name: Clippy
+        run: cargo clippy -p kopdeltav --manifest-path src-tauri/Cargo.toml -- -D warnings
+
   frontend:
     runs-on: ubuntu-latest
     defaults:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 2782fec..5e008ff 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -57,5 +57,5 @@ jobs:
         with:
           draft: true
           name: "KSPDeltaVForMods ${{ github.ref_name }}"
-          body: "Windows desktop build. Requires Python 3.10+ on PATH."
+          body: "Windows desktop build. No external dependencies required."
           files: src-tauri/target/release/bundle/nsis/*.exe

From a9e62e84c0d1f14faa68d1bba7f3a0b49e654e2b Mon Sep 17 00:00:00 2001
From: Yumeno Yuuka <sounyan.is.the.angel@gmail.com>
Date: Fri, 3 Apr 2026 10:10:17 +0900
Subject: [PATCH 8/8] fix: remove waitForBackend and Python copy step from
 merge conflict resolution

---
 .github/workflows/release.yml |  9 -------
 frontend/src/main.ts          | 47 ++++++++++-------------------------
 2 files changed, 13 insertions(+), 43 deletions(-)

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 7fe5b6e..5e008ff 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -42,15 +42,6 @@ jobs:
       - name: Install Tauri CLI
         run: cargo install tauri-cli --version "^2"
 
-      - name: Copy Python backend into Tauri resources
-        run: |
-          mkdir -p src-tauri/resources/kopdeltav
-          cp api.py src-tauri/resources/
-          cp launcher.py src-tauri/resources/
-          cp kopdeltav/*.py src-tauri/resources/kopdeltav/
-          cp requirements.txt src-tauri/resources/
-        shell: bash
-
       - name: Build Tauri app
         run: cargo tauri build --bundles nsis
         working-directory: src-tauri
diff --git a/frontend/src/main.ts b/frontend/src/main.ts
index 8bc615c..750cde5 100644
--- a/frontend/src/main.ts
+++ b/frontend/src/main.ts
@@ -7,42 +7,21 @@ import 'primeicons/primeicons.css'
 import App from './App.vue'
 import router from './router'
 import i18n from './i18n'
-import { waitForBackend } from './composables/useApi'
 import './assets/styles/main.css'
 
-async function bootstrap(): Promise<void> {
-  // In production (Tauri), wait for the Python backend to start
-  if (!import.meta.env.DEV) {
-    const ready = await waitForBackend()
-    if (!ready) {
-      const el = document.getElementById('app')
-      if (el) {
-        el.textContent =
-          'Failed to connect to Python backend. Ensure Python 3.10+ is installed and on PATH.'
-        el.style.color = '#ef4444'
-        el.style.padding = '2rem'
-        el.style.fontFamily = 'sans-serif'
-      }
-      return
-    }
-  }
+const app = createApp(App)
 
-  const app = createApp(App)
-
-  app.use(createPinia())
-  app.use(router)
-  app.use(i18n)
-  app.use(PrimeVue, {
-    theme: {
-      preset: Aura,
-      options: {
-        darkModeSelector: '.app-dark',
-      },
+app.use(createPinia())
+app.use(router)
+app.use(i18n)
+app.use(PrimeVue, {
+  theme: {
+    preset: Aura,
+    options: {
+      darkModeSelector: '.app-dark',
     },
-  })
-  app.use(ToastService)
-
-  app.mount('#app')
-}
+  },
+})
+app.use(ToastService)
 
-bootstrap()
+app.mount('#app')