using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;

class Player
{
    public int Id;
    public int Row;
    public int Col;
    public ConsoleColor Color;
    public TcpClient Client;
}

class Server
{
    static int[,] maze = new int[,]
    {
        { 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },
        { 1, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1 },
        { 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1 },
        { 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1 },
        { 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1 },
        { 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1 },
        { 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1 },
        { 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1 },
        { 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1 },
        { 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1 },
        { 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },
    };

    static List<Player> players = new List<Player>();
    static Random rand = new Random();

    static void Main()
    {
        TcpListener listener = new TcpListener(IPAddress.Any, 65500);
        listener.Start();
        Console.WriteLine("Server running...");

        while (true)
        {
            TcpClient client = listener.AcceptTcpClient();
            Thread t = new Thread(() => HandleClient(client));
            t.Start();
        }
    }

    static void HandleClient(TcpClient client)
    {
        Player player = new Player
        {
            Id = rand.Next(1000, 9999),
            Row = 1,
            Col = 5,
            Color = (ConsoleColor)rand.Next(1, 15),
            Client = client
        };
        lock (players) { players.Add(player); }

        NetworkStream stream = client.GetStream();
        byte[] buffer = new byte[1024];
        while (true)
        {
            try
            {
                int read = stream.Read(buffer, 0, buffer.Length);
                if (read == 0) break;
                string move = Encoding.UTF8.GetString(buffer, 0, read);

                int newRow = player.Row;
                int newCol = player.Col;
                if (move == "W") newRow--;
                if (move == "S") newRow++;
                if (move == "A") newCol--;
                if (move == "D") newCol++;

                if (maze[newRow, newCol] != 1)
                {
                    player.Row = newRow;
                    player.Col = newCol;
                }

                SendMapToAll();
            }
            catch { break; }
        }

        lock (players) { players.Remove(player); }
        client.Close();
    }

    static void SendMapToAll()
    {
        lock (players)
        {
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < maze.GetLength(0); i++)
            {
                for (int j = 0; j < maze.GetLength(1); j++)
                {
                    var playerHere = players.Find(p => p.Row == i && p.Col == j);
                    if (playerHere != null)
                        sb.Append("00");
                    else if (maze[i, j] == 1)
                        sb.Append("██");
                    else if (maze[i, j] == 2)
                        sb.Append("XX");
                    else
                        sb.Append("  ");
                }
                sb.AppendLine();
            }

            byte[] data = Encoding.UTF8.GetBytes(sb.ToString());
            foreach (var p in players)
            {
                try { p.Client.GetStream().Write(data, 0, data.Length); } catch { }
            }
        }
    }
}