using System;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using FNAF_Clone.GUI;
using FNAF_Clone.Map;
using GlobalClassLib;
using LiteNetLib;
using LiteNetLib.Utils;
using PacketLib;

namespace FNAF_Clone;

public class Client {
    public enum ConnectionState {
        IDLE,
        CONNECTING,
        CONNECTED,
        ACCEPTED,
        GAME_STARTING,
        GAME_IN_PROGRESS,
        SERVER_NOT_FOUND,
        SERVER_FULL,
        ERROR
    }
    
    public static ConnectionState State { get; private set; } = ConnectionState.IDLE;
    
    private static EventBasedNetListener listener = new();
    private static NetManager client;
    private static NetPeer server;

    private static NetDataWriter writer;
    private static NetPacketProcessor processor;
    public static ClientPlayer Player { get; } = new();
    public static ClientPlayer Opponent { get; } = new();
    
    public static ClientPlayer GetPlayer(int pid) => Player.state.pid == pid ? Player : Opponent;

    public static void Connect(string endPoint, int port) {
        State = ConnectionState.CONNECTING;
        writer = new NetDataWriter();
        processor = new NetPacketProcessor();
        
        NestedTypeManager.AutoRegister(processor);
        
        processor.SubscribeReusable<JoinAcceptPacket>(OnJoinAccept);
        processor.SubscribeReusable<UpdatePlayerPacket>(OnPlayerUpdate);
        processor.SubscribeReusable<MapInitPacket>(OnMapInit);
        processor.SubscribeReusable<OpponentInitPacket>(packet => { // TODO: move this to a method
            Opponent.state = packet.state;
            Opponent.username = packet.username;
            State = ConnectionState.GAME_STARTING;
        });
        
        client = new NetManager(listener){
            AutoRecycle = true
        };

        client.Start();
        Console.WriteLine($"Connecting to server @ {endPoint}:{port}");
        
        listener.NetworkReceiveEvent += (peer, reader, channel, method) => {
            OnNetworkReceive(peer, reader, method);
        };
        
        listener.PeerConnectedEvent += peer => {
            Console.WriteLine("Connected to Server");
            server = peer;
            State = ConnectionState.CONNECTED;
            SendPacket(new JoinPacket {username = Player.username == "" ? "Anonymous" : Player.username}, DeliveryMethod.ReliableOrdered);
        };
        
        new Thread(() => client.Connect(endPoint, port, "")).Start(); // TODO: figure out how keys work
    }

    public static void SendPacket<T>(T packet, DeliveryMethod deliveryMethod) where T : class, new() {
        if (server != null) {
            writer.Reset();
            processor.Write(writer, packet);
            server.Send(writer, deliveryMethod);
        }
    }
    public static void SendCommands(PlayerCommand[] pCommands) {
        SendPacket(new PlayerCommandPacket{commands = pCommands}, DeliveryMethod.ReliableOrdered);
    }

    private static void OnNetworkReceive(NetPeer peer, NetPacketReader reader, DeliveryMethod deliveryMethod) {
        processor.ReadAllPackets(reader, peer);
    }

    private static void OnJoinAccept(JoinAcceptPacket packet) {
        Console.WriteLine($"Accepted by server, pid: {packet.state.pid}");
        State = ConnectionState.ACCEPTED;
        Player.state = packet.state;
    }

    private static void OnMapInit(MapInitPacket packet) {
        (int id1, int id2, ConnectorType type)[] connectorsData = new (int id1, int id2, ConnectorType type)[packet.Connectors.Length / 3];
        for (int i = 0; i < packet.Connectors.Length / 3; i++){
            connectorsData[i] = (packet.Connectors[i * 3], packet.Connectors[i * 3 + 1], (ConnectorType)packet.Connectors[i * 3 + 2]);
        }
        ClientMapManager.InitMap(packet.UpsideDown);
        TileConnectorProjection[] connectors = connectorsData.Select(c => new TileConnectorProjection(ClientMapManager.Get(c.id1), ClientMapManager.Get(c.id2), c.type)).ToArray();
        ClientMapManager.InitConnectors(connectors);
        
        UIManager.SpawnMapElements(connectors.Where(c => c.Type == ConnectorType.DOOR_REMOTE).ToArray());
        
    }
    
    public static void Update() {
        client.PollEvents();
    }

    public static void OnPlayerUpdate(UpdatePlayerPacket packet) { // TODO: move this to a separate class
        EventProcessor.Evaluate(packet.events);
        //Player.state = Player.state.pid == 0 ? packet.stateP1 : packet.stateP2;

        
    }
    
    
}