Syntriax.Engine/Engine.Core/Abstract/BaseEntity.cs

using System;

namespace Syntriax.Engine.Core.Abstract;

public abstract class BaseEntity : IEntity
{
    public Action<IEntity, string>? OnIdChanged { get; set; } = null;

    public Action<IAssignable>? OnUnassigned { get; set; } = null;
    public Action<IAssignableStateEnable>? OnStateEnableAssigned { get; set; } = null;

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


    private IStateEnable _stateEnable = null!;

    private bool _initialized = false;
    private string _id = string.Empty;

    public virtual IStateEnable StateEnable => _stateEnable;

    public virtual bool IsActive => StateEnable.Enabled;

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

            string previousId = _id;

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

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

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

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

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

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

        UnassignInternal();

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

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

        InitializeInternal();

        Initialized = true;
        return true;
    }

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

        FinalizeInternal();

        Initialized = false;
        return true;
    }

    protected BaseEntity() => _id = Guid.NewGuid().ToString("D");
    protected BaseEntity(string id) => _id = id;
}