K1_random

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;

namespace ANOTHER_Kontras
{
    class Program
    {
        static void Main(string[] args)
        {
            BookStore allBooks = InOut.InputBooks("Knygos.txt");
            List<Book> soldBooks = InOut.InputSoldBooks("Pardavimai.txt");

            File.Delete("Data.txt");
            InOut.Print(allBooks, "Data.txt", "Knygynas");
            InOut.Print(soldBooks, "Data.txt", "Parduotos knygos");

            allBooks.AddSalePrice(soldBooks);
            InOut.Print(soldBooks, "Data.txt", "Papildyta");

            BookStore allSoldBooks = new BookStore(soldBooks);
            string moneyLeft = String.Format("Truksta Manio {0}", allBooks.Sum() - allSoldBooks.Sum());
            InOut.Print(allBooks, "Data.txt", "Knygynas");
            File.AppendAllText("Data.txt", moneyLeft);

        }
    }
    class Book
    {
        public string Distributor { get; set; }
        public string Title { get; set; }
        public int Amount { get; set; }
        public decimal Price { get; set; }

        public Book(string distributor, string title, int amount, decimal price)
        {
            this.Distributor = distributor;
            this.Title = title;
            this.Amount = amount;
            this.Price = price;
        }
        public override string ToString()
        {
            return string.Format("| {0, -18} | {1, -18} | {2, 8} | {3, 8} |", this.Distributor, this.Title, this.Amount, this.Price);
        }
        public static bool operator <=(Book lhs, Book rhs)
        {
            return lhs.Price <= rhs.Price;
        }
        public static bool operator >=(Book lhs, Book rhs)
        {
            return lhs.Price >= rhs.Price;
        }
    }
    class BookStore
    {
        private List<Book> allBooks = new List<Book>();

        public BookStore(List<Book> books)
        {
            foreach (Book book in books)
            {
                allBooks.Add(book);
            }
        }
        public int GetCount()
        {
            return this.allBooks.Count;
        }
        public Book GetBook(int index)
        {
            return allBooks[index];
        }
        public void AddBook(Book book)
        {
            this.allBooks.Add(book);
        }
        public decimal Sum()
        {
            decimal max = 0;
            foreach (Book book in allBooks)
            {
                max += book.Price * book.Amount;
            }
            return max;
        }
        public int IndexMaxPrice(Book book)
        {
            int index = 0;
            decimal price = 0m;
            for (int i = 0; i < allBooks.Count; i++)
            {
                if(allBooks[i].Title == book.Title && price < allBooks[i].Price)
                {
                    index = i;
                }
            }
            return index;
        }
        public void AddSalePrice(List<Book> books)
        {
            int index;
            foreach(Book book in books)
            {
                for (int i = 0; i < allBooks.Count; i++)
                {
                    if (book.Title == allBooks[i].Title)
                    {
                        index = IndexMaxPrice(allBooks[i]);
                        book.Price = allBooks[index].Price;
                    }
                }
            }
        }
    }
    static class InOut
    {
        public static BookStore InputBooks(string fileName)
        {
            List<Book> allBooks = new List<Book>();
            string[] lines = File.ReadAllLines(fileName);
            foreach(string line in lines)
            {
                string[] value = line.Split(';');
                string distributor = value[0];
                string title = value[1];
                int amount = int.Parse(value[2]);
                decimal price = decimal.Parse(value[3]);

                Book book = new Book(distributor, title, amount, price);
                allBooks.Add(book);
            }
            BookStore bookStore = new BookStore(allBooks);
            return bookStore;

        }
        public static List<Book> InputSoldBooks(string fileName)
        {
            List<Book> soldBooks = new List<Book>();
            string[] lines = File.ReadAllLines(fileName);
            for (int i = 0; i < lines.Length; i++)
            {
                Book book = new Book("", lines[i], 1, 0);
                soldBooks.Add(book);
            }
            return soldBooks;
        }
        public static void Print(BookStore books, string fileName, string header)
        {
            string[] lines = new string[books.GetCount() + 5];
            lines[0] = header;
            lines[1] = new string('-', 64);
            lines[2] = String.Format("| {0, -18} | {1, -18} | {2, 8} | {3, 8} |", "Platintojas", "Pavadinimas", "Kiekis", "Kaina");
            lines[3] = new string('-', 64);
            for (int i = 0; i < books.GetCount(); i++)
            {
                lines[i + 4] = books.GetBook(i).ToString();
            }
            lines[lines.Length - 1] = new string('-', 64);
            File.AppendAllLines(fileName, lines, Encoding.UTF8);
        }
        public static void Print(List<Book> books, string fileName, string header)
        {
            string[] lines = new string[books.Count + 5];
            lines[0] = header;
            lines[1] = new string('-', 64);
            lines[2] = String.Format("| {0, -18} | {1, -18} | {2, 8} | {3, 8} |", "Platintojas", "Pavadinimas", "Kiekis", "Kaina");
            lines[3] = new string('-', 64);
            for (int i = 0; i < books.Count; i++)
            {
                lines[i + 4] = books[i].ToString();
            }
            lines[lines.Length - 1] = new string('-', 64);
            File.AppendAllLines(fileName, lines, Encoding.UTF8);
        }
    }
}