using System;

using Microsoft.Xna.Framework.Input;

using LiteNetLib;

using Syntriax.Engine.Core;
using Syntriax.Engine.Network;
using Syntriax.Engine.Network.Abstract;

namespace Pong.Behaviours;

public class PongManagerBehaviour : BehaviourOverride
{
    public Action<PongManagerBehaviour>? OnReset { get; set; } = null;
    public Action<PongManagerBehaviour>? OnFinished { get; set; } = null;
    public Action<PongManagerBehaviour>? OnScoresUpdated { get; set; } = null;
    public Action<PongManagerBehaviour>? OnScored { get; set; } = null;

    private INetworkCommunicator communicator = null!;

    public int ScoreLeft { get; private set; } = 0;
    public int ScoreRight { get; private set; } = 0;
    public int ScoreSum => ScoreLeft + ScoreRight;

    public int WinScore { get; } = 5;

    public PongManagerBehaviour() => WinScore = 5;
    public PongManagerBehaviour(int winScore) => WinScore = winScore;

    protected override void OnFirstActiveFrame()
    {
        KeyboardInputsBehaviour? buttonInputs = null!;

        if (!BehaviourController.TryGetBehaviour(out buttonInputs))
            buttonInputs = BehaviourController.AddBehaviour<KeyboardInputsBehaviour>();

        if (!GameObject.GameManager.TryFindBehaviour(out INetworkCommunicator? foundCommunicator))
            throw new Exception($"{nameof(INetworkCommunicator)} is missing on GameManager.");

        buttonInputs.RegisterOnRelease(Keys.Space, (_, _1) => Reset());

        communicator = foundCommunicator;
        communicator.RegisterEntityListener(this, OnMessageReceived);
    }

    private void OnMessageReceived(NetPacketReader reader)
    {
        ScoreLeft = reader.GetInt();
        ScoreRight = reader.GetInt();
        OnScoresUpdated?.Invoke(this);

        CheckFinish();
    }

    public void ScoreToLeft()
    {
        ScoreLeft++;
        OnScoresUpdated?.Invoke(this);
        OnScored?.Invoke(this);

        SendData();

        CheckFinish();
    }

    public void ScoreToRight()
    {
        ScoreRight++;
        OnScoresUpdated?.Invoke(this);
        OnScored?.Invoke(this);

        SendData();

        CheckFinish();
    }

    public void Reset()
    {
        ScoreLeft = ScoreRight = 0;
        OnScoresUpdated?.Invoke(this);
        OnReset?.Invoke(this);

        SendData();
    }

    private void CheckFinish()
    {
        int halfwayScore = (int)(WinScore * .5f);

        if (ScoreLeft > halfwayScore || ScoreRight > halfwayScore)
            OnFinished?.Invoke(this);
    }

    private void SendData()
    {
        if (communicator is not INetworkServer server)
            return;

        LiteNetLib.Utils.NetDataWriter dataWriter = communicator.GetEntityWriter(this);
        dataWriter.Put(ScoreLeft);
        dataWriter.Put(ScoreRight);
        server.Manager.SendToAll(dataWriter, LiteNetLib.DeliveryMethod.ReliableOrdered);
    }
}