using System;

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

namespace Syntriax.Engine.Core;

[System.Diagnostics.DebuggerDisplay("{GetType().Name, nq}, Priority: {Priority}, Initialized: {Initialized}")]
public abstract class Behaviour : BaseEntity, IBehaviour
{
    public Action<IAssignableBehaviourController>? OnBehaviourControllerAssigned { get; set; } = null;

    public Action<IBehaviour>? OnPriorityChanged { get; set; } = null;


    private IBehaviourController _behaviourController = null!;

    private int _priority = 0;

    public IBehaviourController BehaviourController => _behaviourController;

    public override bool IsActive => base.IsActive && BehaviourController.GameObject.StateEnable.Enabled;

    public int Priority
    {
        get => _priority;
        set
        {
            if (value == _priority)
                return;

            _priority = value;
            OnPriorityChanged?.Invoke(this);
        }
    }

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

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

    protected override void UnassignInternal()
    {
        base.UnassignInternal();
        _behaviourController = null!;
    }

    protected override void InitializeInternal()
    {
        base.InitializeInternal();
        NotAssignedException.Check(this, _behaviourController);
        NotAssignedException.Check(this, StateEnable);
    }
}