/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * Copyright (c) 2004, 2005, 2006, 2007 Olof Naessén and Per Larsson
 * Copyright (c) 2016, 2018, 2019 Gwilherm Baudic
 *                                                         Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
 * Olof Naessén a.k.a jansem/yakslem                _asww7!uY`>  )\a//
 *                                                 _Qhm`] _f "'c  1!5m
 * Visit: http://guichan.darkbits.org             )Qk<P ` _: :+' .'  "{[
 *                                               .)j(] .d_/ '-(  P .   S
 * License: (BSD)                                <Td/Z <fP"5(\"??"\a.  .L
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 * modification, are permitted provided         _Q-5'5W..j/?'   -?!\)cam'
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 * 1. Redistributions of source code must       .$%w\/]Q  . ."'  .  mj$
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 */

#ifndef GCN_SDL2GRAPHICS_HPP
#define GCN_SDL2GRAPHICS_HPP

#include <SDL.h>

#include "guisan/color.hpp"
#include "guisan/graphics.hpp"
#include "guisan/platform.hpp"

namespace gcn
{
    class Image;
    class Rectangle;

    /**
     * SDL implementation of the Graphics.
     */
    class GCN_EXTENSION_DECLSPEC SDL2Graphics : public Graphics
    {
    public:

        // Needed so that drawImage(gcn::Image *, int, int) is visible.
        using Graphics::drawImage;

        /**
         * Constructor.
         */
        SDL2Graphics() = default;

        /**
         * Destructor.
         */
        ~SDL2Graphics() override;

        /**
         *  Sets the target SDL_Renderer to use for drawing. Preferably done only once. 
         *  
         *  @param renderer the SDL_Renderer to use for drawing.
         *  @param width screen width
         *  @param height screen height
         */
        virtual void setTarget(SDL_Renderer* renderer, int width, int height);

        /**
         * Gets the target SDL_Renderer.
         *
         * @return the target SDL_Renderer.
         */
        virtual SDL_Renderer* getTarget() const;

        /**
         * Draws an SDL_Surface on the target surface. Normally you'll
         * use drawImage, but if you want to write SDL specific code
         * this function might come in handy.
         *
         * NOTE: The clip areas will be taken into account.
         */
        virtual void drawSDLSurface(SDL_Surface* surface, SDL_Rect source,
                                    SDL_Rect destination);

        /**
         * Draws an SDL_Texture on the target surface. Normally you'll
         * use drawImage, but if you want to write SDL specific code
         * this function might come in handy.
         *
         * NOTE: The clip areas will be taken into account.
         */
        virtual void drawSDLTexture(SDL_Texture* texture, SDL_Rect source,
                                    SDL_Rect destination);

        // Inherited from Graphics

        void _beginDraw() override;
        void _endDraw() override;

        bool pushClipArea(Rectangle area) override;
        void popClipArea() override;

        void drawImage(const Image* image,
                       int srcX,
                       int srcY,
                       int dstX,
                       int dstY,
                       int width,
                       int height) override;
        void drawPoint(int x, int y) override;
        void drawLine(int x1, int y1, int x2, int y2) override;

        void drawRectangle(const Rectangle& rectangle) override;
        void fillRectangle(const Rectangle& rectangle) override;

        void setColor(const Color& color) override;
        const Color& getColor() override;

    protected:
        /**
         * Draws a horizontal line.
         *
         * @param x1 the start coordinate of the line.
         * @param y the y coordinate of the line.
         * @param x2 the end coordinate of the line.
         */
        virtual void drawHLine(int x1, int y, int x2);

        /**
         * Draws a vertical line.
         *
         * @param x the x coordinate of the line.
         * @param y1 the start coordinate of the line.
         * @param y2 the end coordinate of the line.
         */
        virtual void drawVLine(int x, int y1, int y2);
        
        /**
         *  Save the current rendering color before drawing.
         *  Does not affect the mColor attribute. 
         */
        virtual void saveRenderColor();
        
        /**
         *  Restore the rendering color after drawing
         */
        virtual void restoreRenderColor();

        SDL_Surface* mTarget = nullptr;
        SDL_Renderer* mRenderTarget = nullptr;
        SDL_Texture* mTexture = nullptr;
        Color mColor;
        Uint8 r = 0, g = 0, b = 0, a = 0; //! to store previous color from renderer
        bool mAlpha = false;
    };
}

#endif // end GCN_SDL2GRAPHICS_HPP
