using System;
using System.Collections.Generic;


//Читатель класс
public struct Reader
{
    public string Name;
    public DateTime Date;

    public Reader(string name, DateTime date)
    {
        Name = name;
        Date = date;
    }
}

public abstract class Book
{
    public string Title;
    public List<string> Authors;
    public int Year;
    public string Publisher;
    public int PagesCount;

    public Book(string title, List<string> authors, int year, string publisher, int pagesCount)
    {
        Title = title;
        Authors = authors;
        Year = year;
        Publisher = publisher;
        PagesCount = pagesCount;
    }

    public Book()
    {
    }
}

public class CatalogBook : Book
{
    public int Id;
    public int Quantity;
    public int Instances;
    public List<Reader> Picked = new();

    public CatalogBook(int id, int quantity)
    {
        Id = id;
        Quantity = quantity;
        Instances = quantity;
        Picked = new List<Reader>();
    }

    public CatalogBook(string title, List<string> authors, int year, string publisher, int pagesCount, int id,
        int quantity, int instances) : base(title, authors, year, publisher, pagesCount)
    {
        Id = id;
        Quantity = quantity;
        Instances = instances;
    }

    //2
    public void AddBooks(int count)
    {
        Quantity += count;
        Instances += count;
    }

    public void RemoveBooks(int count)
    {
        if (Instances > count)
        {
            Quantity -= count;
            Instances -= count;
            // return;
        }
        else
        {
            Console.WriteLine("Книг нет в наличии");
        }
    }

    //5
    public void GiveBook(string name, DateTime time)
    {
        if (Instances > 0)
        {
            Instances -= 1;
            Picked.Add(new Reader(name, time));
        }
    }

    //6
    public void ReturnBook(string name)
    {
        for (var i = 0; i < Picked.Count; i++)
            if (Picked[i].Name == name)
            {
                Instances += 1;
                Picked.Remove(Picked[i]);
                break;
            }
    }

    //7
    public void NeVernul()
    {
        for (var i = 0; i < Picked.Count; i++)
        {
            var datePicked = Picked[i].Date;
            if (DateTime.Now <= datePicked.AddDays(366))
                continue;
            Console.WriteLine( "Читатель должник " + Picked[i].Name + "не вернул книгу " + Title + " " + String.Join(' ', Authors) +
                              " в течение года");
        }
    }
}

public class Library
{
    public List<CatalogBook> Catalog = new();

    //1
    public void AddBook(CatalogBook book)
    {
        Catalog.Add(book);
    }

    public void RemoveBook(CatalogBook book)
    {
        if (Catalog.Contains(book)) Catalog.Remove(book);
    }

    //3
    public void ShowInfo(int findX)
    {
        for (var i = 0; i < Catalog.Count; i++)
            if (Catalog[i].Id == findX)
            {
                Console.WriteLine("Название книги " + Catalog[i].Title
                                                    + " Год выпуска " + Catalog[i].Year
                                                    + " Издатель " + Catalog[i].Publisher);
                var b = Catalog[i];
                for (var j = 0; j < b.Picked.Count; j++)
                {
                    Console.WriteLine("Имя читателя " + b.Picked[j].Name);
                    Console.WriteLine("Дата получения " + b.Picked[j].Date);
                }
            }
    }

    //4
    public CatalogBook FindBook(string title, List<string> authors)
    {
        for (var i = 0; i < Catalog.Count; i++)
            if (Catalog[i].Title == title && Catalog[i].Authors == authors)
            {
                Console.WriteLine(Catalog[i].Id);
                return Catalog[i];
            }

        Console.WriteLine("Книга не найдена");
        return null;
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        var newLibrary = new Library();

        newLibrary.AddBook(new CatalogBook("Книга1", new List<string> {"Автор1", "Автор2"}, 2000, "Издатель1", 100, 1,
            10, 10));
        newLibrary.Catalog[0].GiveBook("Иван Иваныч ", new DateTime(2021, 10, 10));
        foreach (var book in newLibrary.Catalog)
        {
            book.NeVernul();
        }
    }
}