using System;
using System.Collections.Generic;

using Microsoft.Xna.Framework;

using Syntriax.Engine.Core.Abstract;
using Syntriax.Engine.Core.Factory;

namespace Syntriax.Engine.Core;

public class GameManager
{
    public Game Game { get; private set; } = null!;
    private IList<IGameObject> _gameObjects = new List<IGameObject>(Constants.GAME_OBJECTS_SIZE_INITIAL);

    private GameObjectFactory _gameObjectFactory = null!;
    private GameObjectFactory GameObjectFactory
    {
        get
        {
            if (_gameObjectFactory is null)
                _gameObjectFactory = new GameObjectFactory();
            return _gameObjectFactory;
        }
    }

    public IList<IGameObject> GameObjects => _gameObjects;

    public void RegisterGameObject(IGameObject gameObject)
    {
        if (_gameObjects.Contains(gameObject))
            throw new Exception($"{nameof(IGameComponent)} named {gameObject.Name} is already registered to the {nameof(GameManager)}.");

        _gameObjects.Add(gameObject);
    }

    public T InstantiateGameObject<T>(params object?[]? args) where T : class, IGameObject
    {
        T gameObject = GameObjectFactory.Instantiate<T>(args);
        _gameObjects.Add(gameObject);
        return gameObject;
    }

    // public TGameObject RegisterGameObject<TGameObject, TTransform, TBehaviourController, TStateEnable>()
    //     where TGameObject : class, IGameObject
    //     where TTransform : class, ITransform
    //     where TBehaviourController : class, IBehaviourController
    //     where TStateEnable : class, IStateEnable
    // {
    //     TGameObject gameObject = Factory.GameObjectFactory.Get<TGameObject>();
    //     _gameObjects.Add(gameObject);
    //     return gameObject;
    // }

    public void RemoveGameObject(IGameObject gameObject)
    {
        if (!_gameObjects.Contains(gameObject))
            throw new Exception($"{nameof(IGameComponent)} named {gameObject.Name} is not registered to the {nameof(GameManager)}.");

        _gameObjects.Remove(gameObject);
    }
}