using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;

namespace Arena
{
    public class UTTT
    {
        public Process player1Process;
        public Process player2Process;
        public StreamWriter player1Input;
        public StreamWriter player2Input;
        public StreamReader player1Output;
        public StreamReader player2Output;
        public int lastX = -1;
        public int lastY = -1;

        public bool lineReceived = false;

        public UTTT(string player1FileName, string player2FileName)
        {
            ProcessStartInfo info1 = new ProcessStartInfo();
            info1.FileName = player1FileName;
            info1.RedirectStandardInput = true;
            info1.RedirectStandardOutput = true;
            info1.CreateNoWindow = true;
            info1.UseShellExecute = false;
            player1Process = Process.Start(info1);

            ProcessStartInfo info2 = new ProcessStartInfo();
            info2.FileName = player2FileName;
            info2.RedirectStandardInput = true;
            info2.RedirectStandardOutput = true;
            info2.CreateNoWindow = true;
            info2.UseShellExecute = false;
            player2Process = Process.Start(info2);

            player1Input = player1Process.StandardInput;
            player2Input = player2Process.StandardInput;

            player1Output = player1Process.StandardOutput;
            player2Output = player2Process.StandardOutput;
        }

        public int HandlePlayerOutput(int playerIndex, string output)
        {
            string[] split = output.Split(' ');
            int x = int.Parse(split[0]);
            int y = int.Parse(split[1]);

            lastX = x; lastY = y;

            if (split.Length > 2)
            {
                if (split[2] == "WIN")
                    return playerIndex + 1;
                else if (split[2] == "LOSS")
                    return 2 - playerIndex;
                else if (split[2] == "DRAW")
                    return 3;
                else return 0;
            }
            else return 0;
        }

        public int Play()
        {
            lastX = -1;
            lastY = -1;

            int winner = 0;
            int playerId = 0;

            while (winner == 0)
            {
                string updateString = lastX + " " + lastY + "\n" + "0" + "\n";

                if (playerId == 0)
                {
                    player1Input.Write(updateString);
                    player1Input.Flush();
                    string output1 = null;
                    while (output1 == null)
                        output1 = player1Output.ReadLine();
                    winner = HandlePlayerOutput(0, output1);
                }
                else
                {
                    player2Input.Write(updateString);
                    player2Input.Flush();
                    string output2 = null;
                    while (output2 == null)
                        output2 = player2Output.ReadLine();
                    winner = HandlePlayerOutput(1, output2);
                }

                playerId = -playerId + 1;
            }

            player1Input.Close();
            player2Input.Close();
            player1Output.Close();
            player2Output.Close();

            player1Process.Kill();
            player2Process.Kill();

            return winner;
        }
    }
}