diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..3fcda0b
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1768564909,
+        "narHash": "sha256-Kell/SpJYVkHWMvnhqJz/8DqQg2b6PguxVWOuadbHCc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e4bae1bd10c9c57b2cf517953ab70060a828ee6f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..8027e7d
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,31 @@
+{
+  description = "nix develop shell";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs }:
+  let
+    system = "x86_64-linux";
+    pkgs = import nixpkgs { inherit system; };
+  in {
+    devShells.${system}.default = pkgs.mkShell {
+      name = "aga-shell";
+
+      packages = with pkgs; [
+	nodejs
+        python3
+        python3Packages.textual
+        gcc
+	cmake
+	git
+	openssl.dev
+	];
+
+      shellHook = ''
+        echo "nix develop shell aktif"
+      '';
+    };
+  };
+}
diff --git a/tui.py b/tui.py
new file mode 100644
index 0000000..06c7caf
--- /dev/null
+++ b/tui.py
@@ -0,0 +1,619 @@
+#!/usr/bin/env python3
+
+from textual.app import App, ComposeResult
+from textual.containers import Container, Horizontal, Vertical
+from textual.widgets import Header, Footer, Button, Static, Input, Checkbox, Log, Label, DirectoryTree
+from textual.screen import ModalScreen
+from textual.binding import Binding
+from textual import on
+import subprocess
+import asyncio
+import os
+
+
+class FilePickerScreen(ModalScreen):
+	"""Dosya/Klasör seçici ekran"""
+
+	BINDINGS = [
+		Binding("x", "btn_select", "Seç", show=False),
+		Binding("escape,z", "btn_cancel", "İptal", show=False),
+	]
+
+	CSS = """
+	FilePickerScreen {
+		align: center middle;
+	}
+
+	#picker-container {
+		width: 70;
+		height: 25;
+		background: #2b3339;
+		border: thick #a7c080;
+	}
+
+	#picker-title {
+		height: 3;
+		content-align: center middle;
+		background: #a7c080;
+		color: #2b3339;
+		text-style: bold;
+	}
+
+	#picker-path {
+		height: 3;
+		padding: 0 2;
+		background: #232a2e;
+		color: #d3c6aa;
+		content-align: left middle;
+	}
+
+	DirectoryTree {
+		height: 1fr;
+		background: #232a2e;
+		scrollbar-gutter: stable;
+	}
+
+	#picker-buttons {
+		height: 4;
+		align: center middle;
+		background: #2b3339;
+	}
+
+	#picker-buttons Button {
+		margin: 0 1;
+		min-width: 15;
+	}
+	"""
+
+	def __init__(self, title: str = "Dosya/Klasör Seç", start_path: str = "."):
+		super().__init__()
+		self.picker_title = title
+		self.start_path = start_path
+		self.selected_path = None
+
+	def compose(self) -> ComposeResult:
+		with Container(id="picker-container"):
+			yield Static(self.picker_title, id="picker-title")
+			yield Static(f"📂 {os.path.abspath(self.start_path)}", id="picker-path")
+			yield DirectoryTree(self.start_path, id="file_tree")
+			with Horizontal(id="picker-buttons"):
+				yield Button("✓ Seç [x]", id="btn_select", variant="success")
+				yield Button("✗ İptal [z]", id="btn_cancel", variant="error")
+
+	@on(DirectoryTree.FileSelected)
+	def on_file_selected(self, event: DirectoryTree.FileSelected) -> None:
+		"""Dosya seçildiğinde"""
+		self.selected_path = str(event.path)
+		path_display = self.query_one("#picker-path", Static)
+		path_display.update(f"📄 {self.selected_path}")
+
+	@on(DirectoryTree.DirectorySelected)
+	def on_directory_selected(self, event: DirectoryTree.DirectorySelected) -> None:
+		"""Klasör seçildiğinde"""
+		self.selected_path = str(event.path)
+		path_display = self.query_one("#picker-path", Static)
+		path_display.update(f"📂 {self.selected_path}")
+
+	@on(Button.Pressed, "#btn_select")
+	def on_select(self) -> None:
+		"""Seçimi onayla"""
+		if self.selected_path:
+			self.dismiss(self.selected_path)
+		else:
+			self.dismiss(os.path.abspath(self.start_path))
+
+	@on(Button.Pressed, "#btn_cancel")
+	def on_cancel(self) -> None:
+		"""Seçimi iptal et"""
+		self.dismiss(None)
+
+	def action_btn_select(self) -> None:
+		"""Seç - klavye kısayolu [x]"""
+		self.on_select()
+
+	def action_btn_cancel(self) -> None:
+		"""İptal - klavye kısayolu [z/escape]"""
+		self.on_cancel()
+
+
+class CpppTUI(App):
+
+	CSS = """
+	Screen {
+		align: center middle;
+		background: #1e2326;
+	}
+
+	#app-container {
+		width: 85;
+		height: 38;
+		background: #2b3339;
+		border: thick #a7c080;
+	}
+
+	#title-bar {
+		height: 3;
+		content-align: center middle;
+		background: #a7c080;
+		color: #2b3339;
+		text-style: bold;
+	}
+
+	.section {
+		background: #2b3339;
+		padding: 1 2;
+		border-bottom: solid #374247;
+	}
+
+	.input-row {
+		height: 3;
+		margin: 0 0 0 0;
+		align: left middle;
+	}
+
+	.input-label {
+		width: 18;
+		content-align: left middle;
+		color: #d3c6aa;
+		text-style: bold;
+	}
+
+	Input {
+		width: 1fr;
+		height: 3;
+		background: #232a2e;
+		color: #d3c6aa;
+		border: solid #4f585e;
+	}
+
+	Input:focus {
+		border: solid #a7c080;
+	}
+
+	.browse-btn {
+		width: 8;
+		min-width: 8;
+		margin-left: 1;
+		background: #7fbbb3;
+		color: #2b3339;
+	}
+
+	.browse-btn:hover {
+		background: #83c092;
+	}
+
+	.options-row {
+		height: auto;
+		align: left middle;
+		margin: 0 0;
+	}
+
+	Checkbox {
+		background: transparent;
+		color: #d3c6aa;
+		margin: 0 1 0 0;
+		height: 3;
+	}
+
+	#logs-section {
+		height: 10;
+		padding: 0;
+		margin: 0 2;
+	}
+
+	#logs-title {
+		height: 1;
+		background: #dbbc7f;
+		color: #2b3339;
+		content-align: center middle;
+		text-style: bold;
+	}
+
+	Log {
+		height: 9;
+		background: #232a2e;
+		color: #d3c6aa;
+		border: none;
+		padding: 0 1;
+	}
+
+	#buttons-section {
+		height: 4;
+		padding: 1 2;
+		align: center middle;
+	}
+
+	Button {
+		min-width: 12;
+		margin: 0 1;
+		height: 3;
+	}
+
+	.btn-help {
+		background: #7fbbb3;
+		color: #2b3339;
+	}
+
+	.btn-help:hover {
+		background: #83c092;
+	}
+
+	.btn-start {
+		background: #a7c080;
+		color: #2b3339;
+	}
+
+	.btn-start:hover {
+		background: #b4d292;
+	}
+
+	.btn-stop {
+		background: #e67e80;
+		color: #2b3339;
+	}
+
+	.btn-stop:hover {
+		background: #ef8a8c;
+	}
+
+	Footer {
+		background: #374247;
+		color: #d3c6aa;
+	}
+
+	Header {
+		background: #a7c080;
+		color: #2b3339;
+	}
+	"""
+
+	BINDINGS = [
+		Binding("q", "quit", "Çıkış", show=True),
+		Binding("ctrl+c", "quit", "Çıkış", show=False),
+		Binding("s", "toggle_start", "Başlat", show=True),
+		Binding("h", "show_help", "Yardım", show=True),
+	]
+
+	def __init__(self):
+		super().__init__()
+		self.process = None
+		self.process_running = False
+
+	def compose(self) -> ComposeResult:
+		"""Arayüz bileşenlerini oluştur"""
+		yield Header()
+		
+		with Container(id="app-container"):
+			yield Static("╔═══ cppp - tui ═══╗", id="title-bar")
+			
+			# Dosya yolları
+			with Vertical(classes="section"):
+				with Horizontal(classes="input-row"):
+					yield Label("Kaynak (-i):", classes="input-label")
+					yield Input(placeholder="Örn: ./dosya.txt", id="input_path")
+					yield Button("📁", id="btn_browse_input", classes="browse-btn")
+				
+				with Horizontal(classes="input-row"):
+					yield Label("Hedef (-o):", classes="input-label")
+					yield Input(placeholder="Örn: /hedef/klasor/", id="output_path")
+					yield Button("📁", id="btn_browse_output", classes="browse-btn")
+				
+				with Horizontal(classes="input-row"):
+					yield Label("Parça Sayısı (-p):", classes="input-label")
+					yield Input(value="4", placeholder="1-50", id="parts")
+			
+			# Seçenekler
+			with Horizontal(classes="section options-row"):
+				yield Checkbox("Detaylı (-v)", id="verbose", value=True)
+				yield Checkbox("Üzerine Yaz (-f)", id="force")
+				yield Checkbox("SHA-256 (-c)", id="checksum")
+			
+			# Loglar
+			with Vertical(id="logs-section"):
+				yield Static("─── İŞLEM KAYITLARI ───", id="logs-title")
+				yield Log(id="logs", auto_scroll=True)
+			
+			# Butonlar
+			with Horizontal(id="buttons-section"):
+				yield Button("📖 Yardım", id="btn_help", classes="btn-help")
+				yield Button("▶ Başlat", id="btn_start", classes="btn-start")
+		
+		yield Footer()
+
+	async def on_mount(self) -> None:
+		"""Uygulama başlatıldığında"""
+		log = self.query_one("#logs", Log)
+		log.write_line("╔═════════════════╗")
+		log.write_line("║   cppp - tui    ║")
+		log.write_line("╚═════════════════╝")
+		log.write_line("")
+		log.write_line("Hızlı Başlangıç:")
+		log.write_line("  1. Kaynak: Kopyalanacak dosya/klasör")
+		log.write_line("  2. Hedef: Dosyanın gideceği yer")
+		log.write_line("     • Klasör ise: /hedef/klasor/")
+		log.write_line("     • Dosya ise: /hedef/yeni_dosya.txt")
+		log.write_line("  3. Parça sayısını ayarlayın")
+		log.write_line("  4. [s] tuşu ile başlatın")
+		log.write_line("")
+		log.write_line("[s] Başlat | [h] Yardım | [q] Çıkış")
+		log.write_line("")
+
+	@on(Button.Pressed, "#btn_browse_input")
+	def browse_input(self) -> None:
+		"""Kaynak dosya seç"""
+		current_path = self.query_one("#input_path", Input).value or "."
+		
+		def handle_result(result):
+			if result:
+				self.query_one("#input_path", Input).value = result
+		
+		self.push_screen(
+			FilePickerScreen("Kaynak Dosya/Klasör Seç", current_path),
+			handle_result
+		)
+
+	@on(Button.Pressed, "#btn_browse_output")
+	def browse_output(self) -> None:
+		"""Hedef konum seç"""
+		current_path = self.query_one("#output_path", Input).value or "."
+		
+		def handle_result(result):
+			if result:
+				self.query_one("#output_path", Input).value = result
+		
+		self.push_screen(
+			FilePickerScreen("Hedef Konum Seç", current_path),
+			handle_result
+		)
+
+	@on(Button.Pressed, "#btn_help")
+	def on_help(self) -> None:
+		"""Yardım göster"""
+		self.action_show_help()
+
+	def action_show_help(self) -> None:
+		"""Yardım bilgisini göster"""
+		log = self.query_one("#logs", Log)
+		log.clear()
+		log.write_line("╔════════════════════════════════════════════════╗")
+		log.write_line("║          cppp - Yardım Kılavuzu                ║")
+		log.write_line("╚════════════════════════════════════════════════╝")
+		log.write_line("")
+		log.write_line("📋 cppp Nedir?")
+		log.write_line("  Paralel dosya kopyalama aracı. Dosyaları")
+		log.write_line("  parçalara bölerek aynı anda kopyalar.")
+		log.write_line("")
+		log.write_line("📂 Hedef Yol Nasıl Belirtilir?")
+		log.write_line("  • Klasöre kopyala: /hedef/klasor/")
+		log.write_line("  • Yeni isimle kaydet: /hedef/yeni_isim.txt")
+		log.write_line("  • Mevcut klasöre: ./yerel_klasor/")
+		log.write_line("")
+		log.write_line("📝 Örnekler:")
+		log.write_line("  Kaynak: video.mp4  → Hedef: /yedek/")
+		log.write_line("  Sonuç: /yedek/video.mp4")
+		log.write_line("")
+		log.write_line("  Kaynak: dosya.txt  → Hedef: /tmp/yeni.txt")
+		log.write_line("  Sonuç: /tmp/yeni.txt")
+		log.write_line("")
+		log.write_line("⚙️  Seçenekler:")
+		log.write_line("  • Detaylı (-v): İlerleme ve hız gösterir")
+		log.write_line("  • Üzerine Yaz (-f): Var olan dosyaları değiştirir")
+		log.write_line("  • SHA-256 (-c): Bütünlük kontrolü yapar")
+		log.write_line("")
+		log.write_line("💡 Parça Sayısı:")
+		log.write_line("  • Küçük (<100MB): 1-4 parça")
+		log.write_line("  • Orta (100MB-1GB): 4-10 parça")
+		log.write_line("  • Büyük (>1GB): 10-20 parça")
+		log.write_line("")
+		log.write_line("⌨️  Dosya Seçici Tuşları:")
+		log.write_line("  [x] → Seçili dosyayı onayla")
+		log.write_line("  [z] veya [Esc] → İptal")
+		log.write_line("")
+		log.write_line("════════════════════════════════════════════════")
+
+	@on(Button.Pressed, "#btn_start")
+	async def on_start_stop(self) -> None:
+		"""İşlemi başlat veya durdur"""
+		if self.process_running:
+			await self.stop_process()
+		else:
+			await self.start_process()
+
+	async def start_process(self) -> None:
+		"""cppp işlemini başlat"""
+		log = self.query_one("#logs", Log)
+		button = self.query_one("#btn_start", Button)
+		
+		# Değerleri al
+		input_path = self.query_one("#input_path", Input).value.strip()
+		output_path = self.query_one("#output_path", Input).value.strip()
+		parts = self.query_one("#parts", Input).value.strip()
+		
+		# Seçenekleri al
+		verbose = self.query_one("#verbose", Checkbox).value
+		force = self.query_one("#force", Checkbox).value
+		checksum = self.query_one("#checksum", Checkbox).value
+		
+		# Kontroller
+		if not input_path:
+			log.write_line("")
+			log.write_line("❌ Kaynak yolu boş!")
+			return
+		
+		if not output_path:
+			log.write_line("")
+			log.write_line("❌ Hedef yolu boş!")
+			return
+		
+		# Parça sayısını kontrol et
+		try:
+			parts_int = int(parts) if parts else 1
+			if parts_int < 1 or parts_int > 50:
+				log.write_line("")
+				log.write_line("❌ Parça sayısı 1-50 arası olmalı!")
+				return
+		except ValueError:
+			log.write_line("")
+			log.write_line("❌ Geçersiz parça sayısı!")
+			return
+		
+		# cppp binary'sini bul
+		cppp_paths = ["./build/cppp", "./cppp", "cppp"]
+		cppp_bin = None
+		for path in cppp_paths:
+			if os.path.exists(path) or path == "cppp":
+				cppp_bin = path
+				break
+		
+		if not cppp_bin:
+			log.write_line("")
+			log.write_line("❌ cppp bulunamadı!")
+			log.write_line("Kurulum: cd build && cmake .. && make")
+			return
+		
+		# Komutu oluştur
+		cmd = [cppp_bin, "-i", input_path, "-o", output_path]
+		if parts:
+			cmd.extend(["-p", parts])
+		if verbose:
+			cmd.append("-v")
+		if force:
+			cmd.append("-f")
+		if checksum:
+			cmd.append("-c")
+		
+		log.clear()
+		log.write_line("════════════════════════════════════════════════")
+		log.write_line("🚀 Kopyalama Başlatıldı")
+		log.write_line("════════════════════════════════════════════════")
+		log.write_line("")
+		log.write_line("📌 " + " ".join(cmd))
+		log.write_line("")
+		log.write_line("────────────────────────────────────────────────")
+		
+		try:
+			# UI'yi güncelle
+			self.process_running = True
+			button.label = "⏹ Durdur"
+			button.remove_class("btn-start")
+			button.add_class("btn-stop")
+			
+			# İşlemi çalıştır
+			process = await asyncio.create_subprocess_exec(
+				*cmd,
+				stdout=asyncio.subprocess.PIPE,
+				stderr=asyncio.subprocess.PIPE
+			)
+			
+			self.process = process
+			
+			# ANSI escape kodlarını temizle
+			import re
+			ansi_escape = re.compile(r'\x1B(?:[@-Z\\-_]|\[[0-?]*[ -/]*[@-~])')
+			
+			# Çıktıyı oku
+			async def read_stream(stream, prefix=""):
+				buffer = ""
+				progress_count = 0
+				while True:
+					chunk = await stream.read(512)
+					if not chunk:
+						break
+					
+					decoded = chunk.decode('utf-8', errors='ignore')
+					
+					# \r varsa progress bar güncellemesi (her 5 güncellemede bir göster)
+					if '\r' in decoded:
+						parts = decoded.split('\r')
+						for part in parts:
+							if part.strip():
+								clean = ansi_escape.sub('', part).strip()
+								if clean and not clean.startswith('[?25'):
+									# Progress bar mı kontrol et
+									if '[' in clean and '%' in clean and 'MB/s' in clean:
+										progress_count += 1
+										# Her 5 güncellemede bir göster
+										if progress_count % 5 == 0:
+											log.write_line(prefix + clean)
+											await asyncio.sleep(0.02)
+									else:
+										log.write_line(prefix + clean)
+										await asyncio.sleep(0.01)
+					else:
+						buffer += decoded
+						lines = buffer.split('\n')
+						buffer = lines[-1]
+						
+						for line in lines[:-1]:
+							clean = ansi_escape.sub('', line).strip()
+							if clean and not clean.startswith('[?25'):
+								log.write_line(prefix + clean)
+								await asyncio.sleep(0.01)
+			
+			await asyncio.gather(
+				read_stream(process.stdout, ""),
+				read_stream(process.stderr, "⚠️  ")
+			)
+			
+			await process.wait()
+			
+			log.write_line("")
+			log.write_line("────────────────────────────────────────────────")
+			if process.returncode == 0:
+				log.write_line("✅ Başarıyla Tamamlandı!")
+			else:
+				log.write_line(f"❌ Başarısız! (Kod: {process.returncode})")
+			log.write_line("════════════════════════════════════════════════")
+			
+		except FileNotFoundError:
+			log.write_line("")
+			log.write_line("❌ cppp bulunamadı!")
+			log.write_line("Kurulum:")
+			log.write_line("  mkdir build && cd build")
+			log.write_line("  cmake .. && make")
+		except Exception as e:
+			log.write_line("")
+			log.write_line(f"❌ Hata: {str(e)}")
+		finally:
+			self.process_running = False
+			button.label = "▶ Başlat"
+			button.remove_class("btn-stop")
+			button.add_class("btn-start")
+			self.process = None
+
+	async def stop_process(self) -> None:
+		"""Çalışan işlemi durdur"""
+		log = self.query_one("#logs", Log)
+		button = self.query_one("#btn_start", Button)
+		
+		if self.process:
+			log.write_line("")
+			log.write_line("⏹️  Durduruluyor...")
+			self.process.terminate()
+			try:
+				await asyncio.wait_for(self.process.wait(), timeout=5.0)
+				log.write_line("✅ Durduruldu.")
+			except asyncio.TimeoutError:
+				self.process.kill()
+				await self.process.wait()
+				log.write_line("✅ Zorla sonlandırıldı.")
+		
+		self.process_running = False
+		button.label = "▶ Başlat"
+		button.remove_class("btn-stop")
+		button.add_class("btn-start")
+
+	def action_toggle_start(self) -> None:
+		"""Başlat/Durdur - klavye kısayolu"""
+		button = self.query_one("#btn_start", Button)
+		button.press()
+
+
+def main():
+	"""Uygulamayı çalıştır"""
+	app = CpppTUI()
+	app.run()
+
+
+if __name__ == "__main__":
+	main()
\ No newline at end of file