/*
 *  The Mana World
 *  Copyright 2004 The Mana World Development Team
 *
 *  This file is part of The Mana World.
 *
 *  The Mana World is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  any later version.
 *
 *  The Mana World is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with The Mana World; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  $Id$
 */

#include "graphics.h"

#include "log.h"

#include "graphic/imagerect.h"

#include "resources/image.h"

extern volatile int framesToDraw;

Graphics::Graphics():
    mScreen(0)
{
}

Graphics::~Graphics()
{
    _endDraw();
}

bool Graphics::setVideoMode(int w, int h, int bpp, bool fs, bool hwaccel)
{
    int displayFlags = SDL_ANYFORMAT;

    mFullscreen = fs;
    mHWAccel = hwaccel;

    if (fs) {
        displayFlags |= SDL_FULLSCREEN;
    }

    if (hwaccel) {
        displayFlags |= SDL_HWSURFACE | SDL_DOUBLEBUF;
    } else {
        displayFlags |= SDL_SWSURFACE;
    }

    mScreen = SDL_SetVideoMode(w, h, bpp, displayFlags);

    if (!mScreen) {
        return false;
    }

    char videoDriverName[64];

    if (SDL_VideoDriverName(videoDriverName, 64)) {
        logger->log("Using video driver: %s", videoDriverName);
    }
    else {
        logger->log("Using video driver: unkown");
    }

    const SDL_VideoInfo *vi = SDL_GetVideoInfo();

    logger->log("Possible to create hardware surfaces: %s",
            ((vi->hw_available) ? "yes" : "no"));
    logger->log("Window manager available: %s",
            ((vi->wm_available) ? "yes" : "no"));
    logger->log("Accelerated hardware to hardware blits: %s",
            ((vi->blit_hw) ? "yes" : "no"));
    logger->log("Accelerated hardware to hardware colorkey blits: %s",
            ((vi->blit_hw_CC) ? "yes" : "no"));
    logger->log("Accelerated hardware to hardware alpha blits: %s",
            ((vi->blit_hw_A) ? "yes" : "no"));
    logger->log("Accelerated software to hardware blits: %s",
            ((vi->blit_sw) ? "yes" : "no"));
    logger->log("Accelerated software to hardware colorkey blits: %s",
            ((vi->blit_sw_CC) ? "yes" : "no"));
    logger->log("Accelerated software to hardware alpha blits: %s",
            ((vi->blit_sw_A) ? "yes" : "no"));
    logger->log("Accelerated color fills: %s",
            ((vi->blit_fill) ? "yes" : "no"));
    logger->log("Available video memory: %d", vi->video_mem);

    setTarget(mScreen);

    return true;
}

bool Graphics::setFullscreen(bool fs)
{
    if (mFullscreen == fs) {
        return true;
    }

    return setVideoMode(mScreen->w, mScreen->h,
            mScreen->format->BitsPerPixel, fs, mHWAccel);
}

int Graphics::getWidth()
{
    return mScreen->w;
}

int Graphics::getHeight()
{
    return mScreen->h;
}

bool Graphics::drawImage(Image *image, int x, int y)
{
    return drawImage(image, 0, 0, x, y, image->mBounds.w, image->mBounds.h);
}

bool Graphics::drawImage(Image *image, int srcX, int srcY, int dstX, int dstY,
        int width, int height)
{
    dstX += mClipStack.top().xOffset;
    dstY += mClipStack.top().yOffset;

    srcX += image->mBounds.x;
    srcY += image->mBounds.y;

    // Check that preconditions for blitting are met.
    if (!mScreen || !image->mImage) return false;

    SDL_Rect dstRect;
    SDL_Rect srcRect;
    dstRect.x = dstX; dstRect.y = dstY;
    srcRect.x = srcX; srcRect.y = srcY;
    srcRect.w = width;
    srcRect.h = height;

    return !(SDL_BlitSurface(image->mImage, &srcRect, mScreen, &dstRect) < 0);
}

void Graphics::drawImagePattern(Image *image, int x, int y, int w, int h)
{
    int iw = image->getWidth();
    int ih = image->getHeight();
    if (iw == 0 || ih == 0) return;

    int px = 0;                       // X position on pattern plane
    int py = 0;                       // Y position on pattern plane

    while (py < h) {
        while (px < w) {
            int dw = (px + iw >= w) ? w - px : iw;
            int dh = (py + ih >= h) ? h - py : ih;
            drawImage(image, 0, 0, x + px, y + py, dw, dh);
            px += iw;
        }
        py += ih;
        px = 0;
    }
}

void
Graphics::drawImageRect(int x, int y, int w, int h,
                        Image *topLeft, Image *topRight,
                        Image *bottomLeft, Image *bottomRight,
                        Image *top, Image *right,
                        Image *bottom, Image *left,
                        Image *center)
{
    pushClipArea(gcn::Rectangle(x, y, w, h));

    // Draw the center area
    drawImagePattern(center,
            topLeft->getWidth(), topLeft->getHeight(),
            w - topLeft->getWidth() - topRight->getWidth(),
            h - topLeft->getHeight() - bottomLeft->getHeight());

    // Draw the sides
    drawImagePattern(top,
            left->getWidth(), 0,
            w - left->getWidth() - right->getWidth(), top->getHeight());
    drawImagePattern(bottom,
            left->getWidth(), h - bottom->getHeight(),
            w - left->getWidth() - right->getWidth(),
            bottom->getHeight());
    drawImagePattern(left,
            0, top->getHeight(),
            left->getWidth(),
            h - top->getHeight() - bottom->getHeight());
    drawImagePattern(right,
            w - right->getWidth(), top->getHeight(),
            right->getWidth(),
            h - top->getHeight() - bottom->getHeight());

    // Draw the corners
    drawImage(topLeft, 0, 0);
    drawImage(topRight, w - topRight->getWidth(), 0);
    drawImage(bottomLeft, 0, h - bottomLeft->getHeight());
    drawImage(bottomRight,
            w - bottomRight->getWidth(),
            h - bottomRight->getHeight());

    popClipArea();
}

void
Graphics::drawImageRect(int x, int y, int w, int h,
                        const ImageRect &imgRect)
{
    drawImageRect(x, y, w, h,
            imgRect.grid[0], imgRect.grid[2], imgRect.grid[6], imgRect.grid[8],
            imgRect.grid[1], imgRect.grid[5], imgRect.grid[7], imgRect.grid[3],
            imgRect.grid[4]);
}

void Graphics::updateScreen()
{
    SDL_Flip(mScreen);

    // Decrement frame counter when using framerate limiting
    if (framesToDraw > 1) framesToDraw--;

    // Wait while we're not allowed to draw next frame yet
    while (framesToDraw == 1)
    {
        SDL_Delay(10);
    }
}

SDL_Surface* Graphics::getScreenshot()
{
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
    int rmask = 0xff000000;
    int gmask = 0x00ff0000;
    int bmask = 0x0000ff00;
#else
    int rmask = 0x000000ff;
    int gmask = 0x0000ff00;
    int bmask = 0x00ff0000;
#endif
    int amask = 0x00000000;

    SDL_Surface *screenshot = SDL_CreateRGBSurface(SDL_SWSURFACE, mScreen->w,
            mScreen->h, 24, rmask, gmask, bmask, amask);

    SDL_BlitSurface(mScreen, NULL, screenshot, NULL);

    return screenshot;
}