NewHw39

using System;
using System.Collections.Generic;

class Program
{
    private static List<Book> _books = new List<Book>();

    static void Main(string[] args)
    {
        ShowMenu();
    }

    static void ShowMenu()
    {
        string userInput;

        do
        {
            Console.WriteLine("Menu: 1 - add book, 2 - show books, 3 - delete book, 4 - find by parameter, 5 - exit");
            userInput = Console.ReadLine();

            switch (userInput)
            {
                case "1":
                    AddBook();
                    break;
                case "2":
                    ShowAllBooks();
                    break;
                case "3":
                    DeleteBookByIndex();
                    break;
                case "4":
                    FindBooksByParameter();
                    break;
                default:
                    Console.WriteLine("Invalid input");
                    break;
            }

            Console.ReadKey();
            Console.Clear();
        }
        while (userInput != "5");
    }

    static void AddBook()
    {
        string name;
        string author;
        string yearToConvert;
        int year;
        bool isNumber;

        Console.WriteLine("Input name:");
        name = Console.ReadLine();

        Console.WriteLine("Input author:");
        author = Console.ReadLine();

        do
        {
            Console.WriteLine("Input year:");
            yearToConvert = Console.ReadLine();

            isNumber = int.TryParse(yearToConvert, out year);
        }
        while (isNumber == false);

        Book book = new Book(name, author, year);

        _books.Add(book);
    }

    static void ShowAllBooks()
    {
        for (int i = 0; i < _books.Count; i++)
        {
            Console.Write($"{i + 1}. ");
            _books[i].ShowInfo();
        }
    }

    static void DeleteBookByIndex()
    {
        ShowAllBooks();
        int index;
        bool isNumber;

        do
        {
            Console.WriteLine("Input index to delete:");
            string indexToConvert = Console.ReadLine();

            isNumber = int.TryParse(indexToConvert, out index);
        }
        while (isNumber == false);

        if(index < 0 && index >= _books.Count)
        {
            Console.WriteLine("Invalid index");
        }
        else
        {
            _books.RemoveAt(index);

            Console.WriteLine($"Book whith index {index} deleted");
        }
    }

    static void FindBooksByParameter()
    {
        Console.WriteLine("Choose parameter: 1 - name, 2 - author, 3 - year");

        string userInput = Console.ReadLine();

        switch (userInput)
        {
            case "1":
                FindByName();
                break;
            case "2":
                FindByAuthor();
                break;
            case "3":
                FindByYear();
                break;
            default:
                Console.WriteLine("Invalid input");
                break;
        }
    }

    static void FindByName()
    {
        Console.WriteLine("Input name: ");
        string name = Console.ReadLine();

        foreach (var book in _books)
        {
            if (book.Name == name)
            {
                book.ShowInfo();
            }
        }
    }

    static void FindByAuthor()
    {
        Console.WriteLine("Input author: ");
        string author = Console.ReadLine();

        foreach (var book in _books)
        {
            if (book.Author == author)
            {
                book.ShowInfo();
            }
        }
    }

    static void FindByYear()
    {
        bool isNumber;
        int year;

        do
        {
            Console.WriteLine("Input year: ");
            string inputToConvert = Console.ReadLine();

            isNumber = int.TryParse(inputToConvert, out year);
        }
        while (isNumber == false);

        foreach (var book in _books)
        {
            if (book.YearOfPublication == year)
            {
                book.ShowInfo();
            }
        }
    }
}

class Book
{
    public string Name { get; private set; }
    public string Author { get; private set; }
    public int YearOfPublication { get; private set; }

    public Book(string name, string author, int year)
    {
        Name = name;
        Author = author;
        YearOfPublication = year;
    }

    public void ShowInfo()
    {
        Console.WriteLine($"Name - {Name}, Author - {Author}, Year - {YearOfPublication}");
    }
}