using Engine.Core;

namespace Engine.Systems.Tween;

public static class TweenLine2DEquationExtensions
{
    private static readonly BoxedPool<Line2DEquation> boxedLine2DEquationPool = new(2);

    public static ITween TweenLine2DEquation(this Line2DEquation initialLine2DEquation, ITweenManager tweenManager, float duration, Line2DEquation targetLine2DEquation, System.Action<Line2DEquation> setMethod)
    {
        Boxed<Line2DEquation> boxedInitial = boxedLine2DEquationPool.Get(initialLine2DEquation);
        Boxed<Line2DEquation> boxedTarget = boxedLine2DEquationPool.Get(targetLine2DEquation);

        ITween tween = tweenManager.StartTween(duration,
            t => setMethod?.Invoke(
                new Line2DEquation(
                    boxedInitial.Value.Slope.Lerp(boxedTarget.Value.Slope, t),
                    boxedInitial.Value.OffsetY.Lerp(boxedTarget.Value.OffsetY, t)
                )
            )
        );

        tween.OnComplete(() =>
        {
            boxedLine2DEquationPool.Return(boxedInitial);
            boxedLine2DEquationPool.Return(boxedTarget);
        });

        return tween;
    }
}