using Syntriax.Engine.Core.Abstract;

namespace Syntriax.Engine.Core;

public abstract class HierarchyObjectBase : IHierarchyObject
{
    public event IHierarchyObject.OnEnteredHierarchyEventHandler? OnEnteredHierarchy = null;
    public event IHierarchyObject.OnExitedHierarchyEventHandler? OnExitedHierarchy = null;
    public event IEntity.OnIdChangedEventHandler? OnIdChanged = null;
    public event IInitialize.OnInitializedEventHandler? OnInitialized = null;
    public event IInitialize.OnFinalizedEventHandler? OnFinalized = null;
    public event IAssignableStateEnable.OnStateEnableAssignedEventHandler? OnStateEnableAssigned = null;
    public event IAssignable.OnUnassignedEventHandler? OnUnassigned = null;
    public event INameable.OnNameChangedEventHandler? OnNameChanged = null;

    private string _id = string.Empty;
    private string _name = nameof(HierarchyObjectBase);
    private bool _initialized = false;
    private IStateEnable _stateEnable = null!;
    private IGameManager _gameManager = null!;

    public IGameManager GameManager => _gameManager;

    public bool IsInHierarchy => _gameManager is not null;

    public bool IsInitialized
    {
        get => _initialized;
        private set
        {
            if (value == _initialized)
                return;

            _initialized = value;
            if (value)
                OnInitialized?.Invoke(this);
            else
                OnFinalized?.Invoke(this);
        }
    }

    public virtual IStateEnable StateEnable => _stateEnable;

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

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

    public string Id
    {
        get => _id;
        set
        {
            if (value == _id)
                return;

            string previousId = _id;

            _id = value;
            OnIdChanged?.Invoke(this, previousId);
        }
    }

    public bool Assign(IStateEnable stateEnable)
    {
        if (IsInitialized)
            return false;

        _stateEnable = stateEnable;
        _stateEnable.Assign(this);
        OnStateEnableAssigned?.Invoke(this);
        return true;
    }

    protected virtual void UnassignInternal() { }
    public bool Unassign()
    {
        if (IsInitialized)
            return false;

        UnassignInternal();

        OnUnassigned?.Invoke(this);
        return true;
    }

    protected virtual void InitializeInternal() { }
    public bool Initialize()
    {
        if (IsInitialized)
            return false;

        InitializeInternal();

        IsInitialized = true;
        return true;
    }

    protected virtual void FinalizeInternal() { }
    public bool Finalize()
    {
        if (!IsInitialized)
            return false;

        FinalizeInternal();

        IsInitialized = false;
        return true;
    }

    protected virtual void OnEnteringHierarchy(IGameManager gameManager) { }
    bool IHierarchyObject.EnterHierarchy(IGameManager gameManager)
    {
        if (IsInHierarchy)
            return false;

        _gameManager = gameManager;
        OnEnteringHierarchy(gameManager);
        OnEnteredHierarchy?.Invoke(this, gameManager);
        return true;
    }

    protected virtual void OnExitingHierarchy(IGameManager gameManager) { }
    bool IHierarchyObject.ExitHierarchy()
    {
        if (!IsInHierarchy || _gameManager is not IGameManager gameManager)
            return false;

        _gameManager = null!;
        OnExitingHierarchy(gameManager);
        OnExitedHierarchy?.Invoke(this, gameManager);
        return true;
    }
}