using Pong.Scripts.Managers;

namespace Pong.Scripts.Objects;

public partial class Paddle : RigidBody2D
{
	[Export] private double _moveSpeed;

	private double _verticalInput;
	private readonly StringName _paddleUp = "paddle_up";
	private readonly StringName _paddleDown = "paddle_down";
	private ScalingManager _scalingManager;

	private bool _canMove = true;
	private Vector2 _originalPosition;

	private Vector2? _newPosition;

	/// <summary>
	/// property that multiples the moveSpeed by the <see cref="Constants.Meter">Meter</see> constant.
	/// </summary>
	private double MoveSpeed => _moveSpeed * Constants.Meter;

	public override void _EnterTree()
	{
		SetNotifyTransform(true);
		SetNotifyLocalTransform(true);
		_scalingManager = GetNode<ScalingManager>("../ScalingManager");
		_scalingManager.NewPaddlePosition += (_, vector2) => _newPosition = vector2;
	}

	public override void _Process(double delta)
	{
		_verticalInput = GetVerticalInput();
	}

	public override void _IntegrateForces(PhysicsDirectBodyState2D state)
	{
		if (_newPosition.HasValue)
		{
			state.Transform = new Transform2D(0, _newPosition.Value);
			_newPosition = null;
		}

		state.LinearVelocity = Vector2.Up * MoveSpeed * _verticalInput;
	}

	/// <summary>
	/// a method that returns a number that represents input on the vertical axis.
	/// </summary>
	/// <returns>1 for up, -1 for down, 0 for nothing.</returns>
	private double GetVerticalInput()
	{
		if (Input.IsActionPressed(_paddleUp))
		{
			return 1;
		}

		if (Input.IsActionPressed(_paddleDown))
		{
			return -1;
		}

		return 0;
	}
}