/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
//  D E R E L I C T
//
/// // (c) 2003..2024
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Godot;
using Godot.Sharp.Extras;

namespace fsm;

[GlobalClass]
public partial class FSMNode : Node
{

	[ExportCategory( "Config" )]
	[Export]
	public NodePath InitialNodePath = "Movement";


	[ExportCategory( "Runtime" )]
	[Export]
	public StateNode Current = new StateNode();

	[Export]
	public NodePath _nextNode;




	public virtual void Transition( NodePath nextNode )
	{
		if( nextNode == _nextNode )
			return;

		if( !_nextNode.IsEmpty )
		{
			log.warn( $"{log.loc().Log}: Was going to {_nextNode} but instead going to {nextNode}" );
		}

		_nextNode = nextNode;
	}




	public override void _Ready()
	{
		base._Ready();
		this.OnReady();

		Current.Name = "NOPState";

		_nextNode = InitialNodePath;
	}


	public override void _PhysicsProcess( double dt )
	{
		base._PhysicsProcess( dt );

		//Do the transition
		if( !_nextNode.IsEmpty )
		{
			var nextNode = GetNodeOrNull<StateNode>( _nextNode );

			var oldNodePath = new NodePath( Current.Name );

			Current.OnExit( _nextNode );

			Current.ProcessMode = Node.ProcessModeEnum.Disabled;

			Current = nextNode;

			Current.OnEnter( oldNodePath );

			Current.ProcessMode = Node.ProcessModeEnum.Pausable;
		}

	}

}