using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace Kav
{
    public struct Sprite
    {
        public Texture2D Texture { get; }
        public Vector3 Position { get; }
        public Vector2 Origin { get; }
        public float Rotation { get; }
        public Vector2 Scale { get; }
        public SpriteBillboardConstraint BillboardConstraint { get; }

        public Matrix TransformMatrix { get; }

        public Sprite(
            Texture2D texture,
            Vector3 position,
            Vector2 origin,
            float rotation,
            Vector2 scale,
            SpriteBillboardConstraint billboardConstraint = SpriteBillboardConstraint.None
        ) {
            Texture = texture;
            Position = position;
            Origin = origin;
            Rotation = rotation;
            Scale = scale;
            BillboardConstraint = billboardConstraint;
            TransformMatrix = ConstructTransformMatrix(Position, Scale);
        }

        public Sprite(
            Texture2D texture,
            Vector3 position,
            SpriteBillboardConstraint billboardConstraint = SpriteBillboardConstraint.None
        ) {
            Texture = texture;
            Position = position;
            Origin = Vector2.Zero;
            Rotation = 0;
            Scale = Vector2.One;
            BillboardConstraint = billboardConstraint;
            TransformMatrix = ConstructTransformMatrix(Position, Scale);
        }

        private static Matrix ConstructTransformMatrix(
            Vector3 position,
            Vector2 scale
        ) {
            return
                Matrix.CreateTranslation(position) *
                Matrix.CreateScale(scale.X, scale.Y, 1);
        }
    }
}