using SDL2;

namespace KumiScript.Renderer
{
    public class SDLTexture : IDisposable
    {
        readonly nint _id;
        public SDLTexture(string path, SDLRenderer renderer)
        {
            nint surface = SDL_image.IMG_Load(path);
            if (surface == 0)
                throw new Exception(SDL_image.IMG_GetError());
            
            nint texture = SDL.SDL_CreateTextureFromSurface(renderer.id, surface);
            if (texture == 0)
                throw new Exception(SDL.SDL_GetError());

            SDL.SDL_FreeSurface(surface);
            _id = texture;
        }

        public SDLTexture(nint surface, SDLRenderer renderer)
        {
            nint texture = SDL.SDL_CreateTextureFromSurface(renderer.id, surface);
            if (texture == 0)
                throw new Exception(SDL.SDL_GetError());
                
            _id = texture;
        }

        public void Draw(SDLRenderer renderer, SDL.SDL_Rect sourceRect, SDL.SDL_Rect destRect)
        {
            SDL.SDL_RenderCopy(renderer.id, _id, ref sourceRect, ref destRect);
            return;
        }

        public void Dispose()
        {
            SDL.SDL_DestroyTexture(_id);
            return;
        }

        public void QueryTexture(out uint format, out int access, out int width, out int height)
        {
            SDL.SDL_QueryTexture(_id, out format, out access, out width, out height);
            return;
        }

        public void SetAlpha(byte alpha)
        {
            SDL.SDL_SetTextureAlphaMod(_id, alpha);
        }
    }
}