using System.Collections.Generic;

using Syntriax.Engine.Core;

namespace Syntriax.Engine.Integration.MonoGame;

public class DrawableShapeBehaviour : Behaviour2D, IDrawableTriangle, IPreDraw
{
    private readonly Shape2D shape = new([]);
    private readonly List<Triangle> worldTriangles = [];
    private readonly Shape2D worldShape = new([]);
    protected ColorRGB color = new(255, 255, 255);

    public void PreDraw() => UpdateWorldShape();

    public void Draw(ITriangleBatch triangleBatch)
    {
        worldShape.ToTrianglesConvex(worldTriangles);

        foreach (Triangle triangle in worldTriangles)
            triangleBatch.Draw(new(triangle.C, triangle.B, triangle.A), color);
    }

    protected void UpdateWorldShape() => shape.Transform(Transform, worldShape);

    public DrawableShapeBehaviour() => shape = Shape2D.Triangle;
    public DrawableShapeBehaviour(Shape2D shape) => this.shape = shape;
    public DrawableShapeBehaviour(Shape2D shape, ColorRGB color) { this.shape = shape; this.color = color; }
}