Syntriax.Engine/Engine.Core/Behaviour.cs

using System;

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

namespace Syntriax.Engine.Core;

[System.Diagnostics.DebuggerDisplay("Priority: {Priority}, Initialized: {Initialized}")]
public abstract class Behaviour : IBehaviour
{
    public Action<IAssignable>? OnUnassigned { get; set; } = null;
    public Action<IAssignableStateEnable>? OnStateEnableAssigned { get; set; } = null;
    public Action<IAssignableBehaviourController>? OnBehaviourControllerAssigned { get; set; } = null;

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


    private IBehaviourController _behaviourController = null!;
    private IStateEnable _stateEnable = null!;

    private bool _initialized = false;
    private int _priority = 0;

    public IStateEnable StateEnable => _stateEnable;
    public IBehaviourController BehaviourController => _behaviourController;

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

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

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

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

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

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

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

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

    public bool Unassign()
    {
        if (Initialized)
            return false;

        _stateEnable = null!;
        _behaviourController = null!;

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

    public bool Initialize()
    {
        if (Initialized)
            return false;

        NotAssignedException.Check(this, _behaviourController);
        NotAssignedException.Check(this, _stateEnable);

        Initialized = true;
        return true;
    }

    public bool Finalize()
    {
        if (!Initialized)
            return false;

        Initialized = false;
        return true;
    }
}