using System;

using Syntriax.Engine.Core.Abstract;
using Syntriax.Engine.Core.Exceptions;

namespace Syntriax.Engine.Core;

[System.Diagnostics.DebuggerDisplay("Name: {Name}, Initialized: {Initialized}")]
public class GameObject : BaseEntity, IGameObject
{
    public Action<IAssignableTransform>? OnTransformAssigned { get; set; } = null;
    public Action<IAssignableBehaviourController>? OnBehaviourControllerAssigned { get; set; } = null;
    public Action<IAssignableGameManager>? OnGameManagerAssigned { get; set; } = null;

    public Action<IEntity>? OnNameChanged { get; set; } = null;

    public Action<IGameObject>? OnUpdated { get; set; } = null;


    private ITransform _transform = null!;
    private IBehaviourController _behaviourController = null!;
    private IStateEnable _stateEnable = null!;
    private IGameManager _gameManager = null!;

    private string _name = nameof(GameObject);

    public ITransform Transform => _transform;
    public IBehaviourController BehaviourController => _behaviourController;
    public IGameManager GameManager => _gameManager;

    public string Name
    {
        get => _name;
        set
        {
            if (value == _name) return;

            _name = value;
            OnNameChanged?.Invoke(this);
        }
    }

    protected override void InitializeInternal()
    {
        base.InitializeInternal();

        NotAssignedException.Check(this, _transform);
        NotAssignedException.Check(this, _behaviourController);
        NotAssignedException.Check(this, _stateEnable);
        NotAssignedException.Check(this, _gameManager);
    }

    public void Update()
    {
        if (!_stateEnable.Enabled)
            return;

        OnUpdated?.Invoke(this);
    }

    protected override void FinalizeInternal()
    {
        base.FinalizeInternal();

        foreach (IBehaviour behaviour in _behaviourController.GetBehaviours<IBehaviour>())
            behaviour.Finalize();
    }

    public bool Assign(ITransform transform)
    {
        if (Initialized)
            return false;

        _transform = transform;
        OnTransformAssigned?.Invoke(this);
        return true;
    }

    public bool Assign(IBehaviourController behaviourController)
    {
        if (Initialized)
            return false;

        _behaviourController = behaviourController;
        OnBehaviourControllerAssigned?.Invoke(this);
        return true;
    }

    public bool Assign(IGameManager gameManager)
    {
        if (Initialized)
            return false;

        _gameManager = gameManager;
        OnGameManagerAssigned?.Invoke(this);
        return true;
    }

    protected override void UnassignInternal()
    {
        base.UnassignInternal();

        _stateEnable = null!;
        _transform = null!;
        _behaviourController = null!;
        _gameManager = null!;
    }

    public GameObject() { OnBehaviourControllerAssigned += ConnectBehaviourController; }
    private void ConnectBehaviourController(IAssignableBehaviourController controller)
    {
        controller.BehaviourController.OnBehaviourAdded += OnBehaviourAdded;
        controller.BehaviourController.OnBehaviourRemoved += OnBehaviourRemoved;
    }
    private void OnBehaviourRemoved(IBehaviourController _, IBehaviour behaviour) { if (Initialized) behaviour.Initialize(); }
    private void OnBehaviourAdded(IBehaviourController _, IBehaviour behaviour) { if (Initialized) behaviour.Finalize(); }
}