using System;
using System.Collections.Generic;

namespace Automat_prototype
{
    class Program
    {
        public static List<Product> LoadProducts()
        {
            List<Product> ProductList = new List<Product>();
            ProductList.Add(new Product("Pepsi", 3.00, "A1", 8));
            ProductList.Add(new Product("Lipton", 2.50, "A2", 5));
            ProductList.Add(new Product("Snickers", 1.00, "B3", 4));
            ProductList.Add(new Product("Bounty", 2.00, "C5", 7));
            return ProductList;

        }
        static void WorkLoop(List<Product> ProductList)
        {
            while (true) { 
                Console.WriteLine("Dostępne produkty:");
                for (int i = 0; i < ProductList.Count; i++)
                {
                    ProductList[i].ShowInfo();
                }
                Console.WriteLine("Wybierz produkt:");
                string selected = Console.ReadLine();

                for (int i = 0; i < ProductList.Count; i++)
                {
                    if (String.Compare(selected, ProductList[i].Position) == 0)
                    {
                        if (ProductList[i].Amount == 0)
                        {
                            Console.WriteLine("Brak wybranego produktu");
                            break;
                        }
                        else
                        {
                            Console.WriteLine("Wrzuć pieniądze");
                            double money = 0;
                            try
                            {
                                money = double.Parse(Console.ReadLine());
                            }
                            catch (FormatException f) {
                                Console.WriteLine(f.Message);
                            }

                            if (money < ProductList[i].Price)
                            {
                                Console.WriteLine("Wrzuciłeś za mało, następuje zwrot pieniędzy");
                                break;
                            }
                            else
                            {
                                double rest = money - ProductList[i].Price;
                                rest = Math.Round(rest, 2);
                                Console.WriteLine("Wrzucono " + money + "zł, reszta wynosi " + rest);
                                if(rest > 0)
                                {
                                    RestCounter(rest);
                                }

                            }

                            Console.WriteLine("Już podaję");
                            ProductList[i].Amount = ProductList[i].Amount - 1;
                            break;
                        }
                    }

                    if (i == ProductList.Count - 1)
                    {
                        Console.WriteLine("Brak wybranego produktu");
                        break;
                    }
                }
                
            }
        }
        static int RestCounter(double rest)
        {
            int[] coins = new int[6] {0, 0, 0, 0, 0, 0};
            while (rest != 0)
            {
                if(rest >= 5)
                {
                    rest = Math.Round(rest - 5, 2);
                    coins[0] = coins[0] + 1;
                }
                else if (rest >= 2)
                {
                    rest = Math.Round(rest - 2, 2);
                    coins[1] = coins[1] + 1;
                }
                else if (rest >= 1)
                {
                    rest = Math.Round(rest - 1, 2);
                    coins[2] = coins[2] + 1;
                }
                else if (rest >= 0.5)
                {
                    rest = Math.Round(rest - 0.5, 2);
                    coins[3] = coins[3] + 1;
                }
                else if (rest >= 0.2)
                {             
                    rest = Math.Round(rest - 0.2, 2);
                    coins[4] = coins[4] + 1;
                }
                else if (rest >= 0.1)
                {
                    rest = Math.Round(rest - 0.1, 2);
                    coins[5] = coins[5] + 1;
                }
                else
                {
                    Console.WriteLine("Nastąpił błąd przy wydawaniu reszty, proszę skontaktować się z pomocą techniczną");
                    return -1;
                }
            }
            Console.WriteLine("Wydano " + coins[0] + " monet 5zł, " + coins[1] + " monet 2zł, " + coins[2] + " monet 1zł, " + coins[3] + " monet 50gr, " + coins[4] + " monet 20gr, " + coins[5] + " monet 10gr");
            return 0;
        }

        static void Main(string[] args)
        {
            List<Product> ProductList = new List<Product>();
            ProductList = LoadProducts();
            WorkLoop(ProductList);

        }
    }
}