using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;

namespace BankServer
{
    class Program
    {
        static void Main(string[] args)
        {
            Listen();
            Console.Read();
        }

        public static async Task<string> Pay(HttpListenerContext context, HttpListenerRequest request)
        {
            StreamReader reader = new StreamReader(request.InputStream, Encoding.UTF8);
            string Json = await reader.ReadToEndAsync();
            DataOfPayment dataOfPayment = JsonConvert.DeserializeObject<DataOfPayment>(Json);
            HttpListenerResponse response = context.Response;
            byte[] buffer;
            if (dataOfPayment.PIN == "0000")
            {
                buffer = Encoding.UTF8.GetBytes("Отклонено.Код транзакции: 00000000 - 000000. Неверный PIN.");
                response.ContentLength64 = buffer.Length;
                Stream outputErrorePIN = response.OutputStream;
                outputErrorePIN.Write(buffer, 0, buffer.Length);
                outputErrorePIN.Close();
                return buffer.ToString();
            }
            if (dataOfPayment.PriceRefueling > dataOfPayment.Balance)
            {
                buffer = Encoding.UTF8.GetBytes("Отклонено.Код транзакции: 00000000 - 000000. Не достаточно средств.");
                response.ContentLength64 = buffer.Length;
                Stream outputErroreBalance = response.OutputStream;
                outputErroreBalance.Write(buffer, 0, buffer.Length);
                outputErroreBalance.Close();
                return buffer.ToString();
            }
            buffer = Encoding.UTF8.GetBytes($"Одобрено. Код транзакции: {DateTime.Now.ToString("ddMMyyyy - hhmmss")}") ;
            response.ContentLength64 = buffer.Length;
            Stream output = response.OutputStream;
            output.Write(buffer, 0, buffer.Length);
            output.Close();
            return buffer.ToString();
        }

        public static async void Listen()
        {
            HttpListener listener = new HttpListener();
            listener.Prefixes.Add("http://127.0.0.1:8081/");
            listener.Start();
            Console.WriteLine("Ожидание подключений");
            while (true)
            {
                HttpListenerContext context = await listener.GetContextAsync();
                HttpListenerRequest request = context.Request;
                if (request.RawUrl.Contains("/pay") && request.HttpMethod == "POST")
                {
                   string State = await Pay(context, request);
                   Console.WriteLine(State);
                }
                if (request.RawUrl.Contains("/refund") && request.HttpMethod == "POST")
                {
                    HttpListenerResponse response = context.Response;
                    byte[] buffer = Encoding.UTF8.GetBytes($"Средства возвращены.");
                    response.ContentLength64 = buffer.Length;
                    Stream output = response.OutputStream;
                    output.Write(buffer, 0, buffer.Length);
                    output.Close();
                }
            }
        }
    }
}