LibrarySystem2

using System;

class Program
{
    static string[] bookTitles = {
        "Beauty Queens – Libba Bray",
        "Before I Let Go – Marieke Nijkamp",
        "The Belles (#1) – Dhonielle Clayton",
        "Big Bones – Laura Dockrill",
        "Caraval – Stephanie Garber",
        "Coraline – Neil Gaiman",
        "Dangerous Lies – Becca Fitzpatrick",
        "Descendants – Rae Else",
        "Fangirl – Rainbow Rowell",
        "Final Girls – Riley Sager",
        "Girlhood – Cat Clarke",
        "Hades – Alexandra Adornetto",
        "Heaven – Alexandra Adornetto",
        "Home Fire – Kamila Shamsie",
        "Internment – Samira Ahmed",
        "Kindred Spirits – Rainbow Rowell",
        "Milk and Honey – Rupi Kaur",
        "Oleanna – David Mamet",
        "Paintbrush – Hannah Bucchin",
        "Zenn Diagram – Wendy Brant"
    };

    static void Main(string[] args)
    {
        Console.WriteLine("Welcome to the Daryl's Library!");

        DisplayBookList();

        Console.Write("Enter the number of books you need: ");
        int numberOfBooks;
        if (!int.TryParse(Console.ReadLine(), out numberOfBooks))
        {
            Console.WriteLine("Invalid input. Please enter a valid input.");
            return;
        }

        Console.WriteLine();

        for (int i = 1; i <= numberOfBooks; i++)
        {
            Console.WriteLine($"Book #{i}");
            string title = GetBookTitle();

            int numberOfDays = GetNumberOfDays();

            DateTime currentDate = GetCurrentDate();

            DateTime expectedReturnDate = currentDate.AddDays(numberOfDays);

            Console.WriteLine($"Expected return date for {title}: {expectedReturnDate.ToString("dd/MM/yyyy")}");
            Console.WriteLine();
        }

        Console.WriteLine("Thank you for using the Daryl's Library!");
        Console.ReadKey();
    }

    static void DisplayBookList()
    {
        Console.WriteLine("LIST OF BOOKS:");
        for (int i = 0; i < bookTitles.Length; i++)
        {
            Console.WriteLine($"{i + 1}. {bookTitles[i]}");
        }
        Console.WriteLine();
    }

    static string GetBookTitle()
    {
        Console.Write("Enter the title of the book: ");
        return Console.ReadLine();
    }

    static int GetNumberOfDays()
    {
        Console.Write("Enter the number of days you need the book: ");
        if (int.TryParse(Console.ReadLine(), out int numberOfDays))
        {
            return numberOfDays;
        }
        else
        {
            Console.WriteLine("Invalid input.");
            return 0;
        }
    }

    static DateTime GetCurrentDate()
    {
        Console.Write("Enter the current date (format: dd/MM/yyyy): ");
        if (DateTime.TryParseExact(Console.ReadLine(), "dd/MM/yyyy", null, System.Globalization.DateTimeStyles.None, out DateTime currentDate))
        {
            return currentDate;
        }
        else
        {
            Console.WriteLine("Invalid input. Please enter in the format: dd/MM/yyyy.");
            return DateTime.MinValue;
        }
    }
}