using System;
using System.Collections.Generic;
using System.Net;

namespace LightReflectiveMirror
{
    public partial class RelayHandler
    {
        /// <summary>
        /// Returns the current room the client is in, null if client is not in a room.
        /// </summary>
        /// <param name="clientId">The client we are getting the room for</param>
        /// <returns></returns>
        Room GetRoomForPlayer(int clientId)
        {
            for (int i = 0; i < rooms.Count; i++)
            {
                if (rooms[i].hostId == clientId)
                    return rooms[i];

                if (rooms[i].clients.Contains(clientId))
                    return rooms[i];
            }

            return null;
        }

        /// <summary>
        /// Attempts to join a room for a client.
        /// </summary>
        /// <param name="clientId">The client requesting to join the room</param>
        /// <param name="serverId">The server ID of the room</param>
        /// <param name="canDirectConnect">If the client is capable of a direct connection</param>
        /// <param name="localIP">The local IP of the client joining</param>
        void JoinRoom(int clientId, int serverId, bool canDirectConnect, string localIP)
        {
            LeaveRoom(clientId);

            for (int i = 0; i < rooms.Count; i++)
            {
                if (rooms[i].serverId == serverId)
                {
                    if (rooms[i].clients.Count < rooms[i].maxPlayers)
                    {
                        rooms[i].clients.Add(clientId);

                        int sendJoinPos = 0;
                        byte[] sendJoinBuffer = _sendBuffers.Rent(500);

                        if (canDirectConnect && Program.instance.NATConnections.ContainsKey(clientId))
                        {
                            sendJoinBuffer.WriteByte(ref sendJoinPos, (byte)OpCodes.DirectConnectIP);

                            if (Program.instance.NATConnections[clientId].Address.Equals(rooms[i].hostIP.Address))
                                sendJoinBuffer.WriteString(ref sendJoinPos, rooms[i].hostLocalIP == localIP ? "127.0.0.1" : rooms[i].hostLocalIP);
                            else
                                sendJoinBuffer.WriteString(ref sendJoinPos, rooms[i].hostIP.Address.ToString());

                            sendJoinBuffer.WriteInt(ref sendJoinPos, rooms[i].useNATPunch ? rooms[i].hostIP.Port : rooms[i].port);
                            sendJoinBuffer.WriteBool(ref sendJoinPos, rooms[i].useNATPunch);

                            Program.transport.ServerSend(clientId, 0, new ArraySegment<byte>(sendJoinBuffer, 0, sendJoinPos));

                            if (rooms[i].useNATPunch)
                            {
                                sendJoinPos = 0;
                                sendJoinBuffer.WriteByte(ref sendJoinPos, (byte)OpCodes.DirectConnectIP);
                                Console.WriteLine(Program.instance.NATConnections[clientId].Address.ToString());
                                sendJoinBuffer.WriteString(ref sendJoinPos, Program.instance.NATConnections[clientId].Address.ToString());
                                sendJoinBuffer.WriteInt(ref sendJoinPos, Program.instance.NATConnections[clientId].Port);
                                sendJoinBuffer.WriteBool(ref sendJoinPos, true);

                                Program.transport.ServerSend(rooms[i].hostId, 0, new ArraySegment<byte>(sendJoinBuffer, 0, sendJoinPos));
                            }

                            _sendBuffers.Return(sendJoinBuffer);

                            return;
                        }
                        else
                        {

                            sendJoinBuffer.WriteByte(ref sendJoinPos, (byte)OpCodes.ServerJoined);
                            sendJoinBuffer.WriteInt(ref sendJoinPos, clientId);

                            Program.transport.ServerSend(clientId, 0, new ArraySegment<byte>(sendJoinBuffer, 0, sendJoinPos));
                            Program.transport.ServerSend(rooms[i].hostId, 0, new ArraySegment<byte>(sendJoinBuffer, 0, sendJoinPos));
                            _sendBuffers.Return(sendJoinBuffer);
                            return;
                        }
                    }
                }
            }

            // If it got to here, then the server was not found, or full. Tell the client.
            int pos = 0;
            byte[] sendBuffer = _sendBuffers.Rent(1);

            sendBuffer.WriteByte(ref pos, (byte)OpCodes.ServerLeft);

            Program.transport.ServerSend(clientId, 0, new ArraySegment<byte>(sendBuffer, 0, pos));
            _sendBuffers.Return(sendBuffer);
        }

        /// <summary>
        /// Creates a room on the LRM node.
        /// </summary>
        /// <param name="clientId">The client requesting to create a room</param>
        /// <param name="maxPlayers">The maximum amount of players for this room</param>
        /// <param name="serverName">The name for the server</param>
        /// <param name="isPublic">Weather or not the server should show up on the server list</param>
        /// <param name="serverData">Extra data the host can include</param>
        /// <param name="useDirectConnect">Weather or not, the host is capable of doing direct connections</param>
        /// <param name="hostLocalIP">The hosts local IP</param>
        /// <param name="useNatPunch">Weather or not, the host is supporting NAT Punch</param>
        /// <param name="port">The port of the direct connect transport on the host</param>
        void CreateRoom(int clientId, int maxPlayers, string serverName, bool isPublic, string serverData, bool useDirectConnect, string hostLocalIP, bool useNatPunch, int port)
        {
            LeaveRoom(clientId);
            Program.instance.NATConnections.TryGetValue(clientId, out IPEndPoint hostIP);

            Room room = new Room
            {
                hostId = clientId,
                maxPlayers = maxPlayers,
                serverName = serverName,
                isPublic = isPublic,
                serverData = serverData,
                clients = new List<int>(),

                // hard coded for now REMEMBER TO UN-HARDCODE RETARD
                // this is needed for load balancer to know which server this room 
                // belongs to
                relayInfo = new RelayAddress { Address = Program.publicIP, Port = 7777, EndpointPort = Program.conf.EndpointPort },

                serverId = GetRandomServerID(),
                hostIP = hostIP,
                hostLocalIP = hostLocalIP,
                supportsDirectConnect = hostIP == null ? false : useDirectConnect,
                port = port,
                useNATPunch = useNatPunch
            };

            rooms.Add(room);

            int pos = 0;
            byte[] sendBuffer = _sendBuffers.Rent(5);

            sendBuffer.WriteByte(ref pos, (byte)OpCodes.RoomCreated);
            sendBuffer.WriteInt(ref pos, clientId);

            Program.transport.ServerSend(clientId, 0, new ArraySegment<byte>(sendBuffer, 0, pos));
            _sendBuffers.Return(sendBuffer);
        }

        /// <summary>
        /// Makes the client leave their room.
        /// </summary>
        /// <param name="clientId">The client of which to remove from their room</param>
        /// <param name="requiredHostId">The ID of the client who kicked the client. -1 if the client left on their own terms</param>
        void LeaveRoom(int clientId, int requiredHostId = -1)
        {
            for (int i = 0; i < rooms.Count; i++)
            {
                if (rooms[i].hostId == clientId)
                {
                    int pos = 0;
                    byte[] sendBuffer = _sendBuffers.Rent(1);
                    sendBuffer.WriteByte(ref pos, (byte)OpCodes.ServerLeft);

                    for (int x = 0; x < rooms[i].clients.Count; x++)
                        Program.transport.ServerSend(rooms[i].clients[x], 0, new ArraySegment<byte>(sendBuffer, 0, pos));

                    _sendBuffers.Return(sendBuffer);
                    rooms[i].clients.Clear();
                    rooms.RemoveAt(i);
                    return;
                }
                else
                {
                    if (requiredHostId >= 0 && rooms[i].hostId != requiredHostId)
                        continue;

                    if (rooms[i].clients.RemoveAll(x => x == clientId) > 0)
                    {
                        int pos = 0;
                        byte[] sendBuffer = _sendBuffers.Rent(5);

                        sendBuffer.WriteByte(ref pos, (byte)OpCodes.PlayerDisconnected);
                        sendBuffer.WriteInt(ref pos, clientId);

                        Program.transport.ServerSend(rooms[i].hostId, 0, new ArraySegment<byte>(sendBuffer, 0, pos));
                        _sendBuffers.Return(sendBuffer);
                    }
                }
            }
        }
    }
}