using SDL2;

namespace KumiScript.Renderer
{
    public class Glyph : IDisposable
    {
        readonly char _char;
        readonly int _width;
        readonly int _height;
        SDLTexture _tex;
        SDLRenderer _renderer;
        
        public Glyph(char c, SDLFont font, SDL.SDL_Color clr, SDLRenderer renderer)
        {
            _char = c;
            nint surface = SDL_ttf.TTF_RenderGlyph32_Blended(font.GetHandle(), c, clr);
            _tex = new SDLTexture(surface, renderer);
            SDL.SDL_FreeSurface(surface);
            _tex.QueryTexture(out _, out _, out _width, out _height);
            _renderer = renderer;
        }

        public void Dispose()
        {
            _tex.Dispose();
            return;
        }

        public char GetCharacter()
        {
            return _char;
        }

        public SDLTexture GetTexture()
        {
            return _tex;
        }

        public int GetWidth()
        {
            return _width;
        }

        public void DrawAt(int x, int y)
        {
            SDL.SDL_Rect destRect;
            destRect.x = x;
            destRect.y = y;
            destRect.w = _width;
            destRect.h = _height;

            SDL.SDL_Rect sourceRect;
            sourceRect.x = 0;
            sourceRect.y = 0;
            sourceRect.w = _width;
            sourceRect.h = _height;

            _tex.Draw(_renderer, sourceRect, destRect);
        }

        public void DrawAdvancePen(int x, int y, out int pen)
        {
            SDL.SDL_Rect destRect;
            destRect.x = x;
            destRect.y = y;
            destRect.w = _width;
            destRect.h = _height;

            SDL.SDL_Rect sourceRect;
            sourceRect.x = 0;
            sourceRect.y = 0;
            sourceRect.w = _width;
            sourceRect.h = _height;

            _tex.Draw(_renderer, sourceRect, destRect);
            pen = x + _width;
        }

        internal void DrawAdvancePenModAlpha(int x, int y, out int pen, byte v)
        {
            _tex.SetAlpha(v);
            
            SDL.SDL_Rect destRect;
            destRect.x = x;
            destRect.y = y;
            destRect.w = _width;
            destRect.h = _height;

            SDL.SDL_Rect sourceRect;
            sourceRect.x = 0;
            sourceRect.y = 0;
            sourceRect.w = _width;
            sourceRect.h = _height;

            _tex.Draw(_renderer, sourceRect, destRect);
            _tex.SetAlpha(255);
            pen = x + _width;
            return;
        }
    }
}