/* ResidualVM - A 3D game interpreter
 *
 * ResidualVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program 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 (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#include "backends/graphics/sdl/resvm-sdl-graphics.h"

#include "backends/platform/sdl/sdl-sys.h"
#include "backends/events/sdl/sdl-events.h"

#include "common/config-manager.h"
#include "common/textconsole.h"

static const OSystem::GraphicsMode s_supportedGraphicsModes[] = {
		{0, 0, 0}
};

ResVmSdlGraphicsManager::ResVmSdlGraphicsManager(SdlEventSource *source, SdlWindow *window) :
		SdlGraphicsManager(source, window),
		_fullscreen(false),
		_lockAspectRatio(true),
		_overlayVisible(false),
		_overlayWidth(0),
		_overlayHeight(0),
		_overlayDirty(true),
		_screenChangeCount(0),
		_capabilities(capabilities) {
	ConfMan.registerDefault("fullscreen_res", "desktop");
	ConfMan.registerDefault("aspect_ratio", true);

	detectDesktopResolution();
}

ResVmSdlGraphicsManager::~ResVmSdlGraphicsManager() {
}

void ResVmSdlGraphicsManager::activateManager() {
	SdlGraphicsManager::activateManager();

	// Register the graphics manager as a event observer
	g_system->getEventManager()->getEventDispatcher()->registerObserver(this, 10, false);
}

void ResVmSdlGraphicsManager::deactivateManager() {
	// Unregister the event observer
	if (g_system->getEventManager()->getEventDispatcher()) {
		g_system->getEventManager()->getEventDispatcher()->unregisterObserver(this);
	}

	SdlGraphicsManager::deactivateManager();
}

ResVmSdlGraphicsManager::GameRenderTarget ResVmSdlGraphicsManager::selectGameRenderTarget(bool fullscreen,
                                                                                              bool accel3d,
                                                                                              bool engineSupportsArbitraryResolutions,
                                                                                              bool framebufferSupported,
                                                                                              bool lockAspectRatio) {
	if (!fullscreen) {
		return kScreen;
	}

	if (!accel3d && lockAspectRatio) {
		return kSubScreen;
	}

	if (!engineSupportsArbitraryResolutions && framebufferSupported) {
		return kFramebuffer;
	}

	return kScreen;
}

Math::Rect2d ResVmSdlGraphicsManager::computeGameRect(GameRenderTarget gameRenderTarget, uint gameWidth, uint gameHeight,
                                                        uint effectiveWidth, uint effectiveHeight) {
	switch (gameRenderTarget) {
		case kScreen:
			// The game occupies the whole screen
			return Math::Rect2d(Math::Vector2d(0, 0), Math::Vector2d(1, 1));
		case kSubScreen:
			// The game is centered on the screen
			return Math::Rect2d(
					Math::Vector2d((effectiveWidth - gameWidth) / 2, (effectiveHeight - gameHeight) / 2),
					Math::Vector2d((effectiveWidth + gameWidth) / 2, (effectiveHeight + gameHeight) / 2)
			);
		case kFramebuffer:
			if (_lockAspectRatio) {
				// The game is scaled to fit the screen, keeping the same aspect ratio
				float scale = MIN(effectiveHeight / float(gameHeight), effectiveWidth / float(gameWidth));
				float scaledW = scale * (gameWidth / float(effectiveWidth));
				float scaledH = scale * (gameHeight / float(effectiveHeight));
				return Math::Rect2d(
						Math::Vector2d(0.5 - (0.5 * scaledW), 0.5 - (0.5 * scaledH)),
						Math::Vector2d(0.5 + (0.5 * scaledW), 0.5 + (0.5 * scaledH))
				);
			} else {
				// The game occupies the whole screen
				return Math::Rect2d(Math::Vector2d(0, 0), Math::Vector2d(1, 1));
			}
		default:
			error("Unhandled game render target '%d'", gameRenderTarget);
	}
}

bool ResVmSdlGraphicsManager::canUsePreferredResolution(GameRenderTarget gameRenderTarget,
                                                          bool engineSupportsArbitraryResolutions) {
	switch (gameRenderTarget) {
		case kScreen:
			// If the game supports arbitrary resolutions, use the preferred mode as the game mode
			return engineSupportsArbitraryResolutions;
		case kSubScreen:
		case kFramebuffer:
			return true;
		default:
			error("Unhandled game render target '%d'", gameRenderTarget);
	}
}

void ResVmSdlGraphicsManager::detectDesktopResolution() {
#if SDL_VERSION_ATLEAST(2, 0, 0)
	SDL_DisplayMode di;
	if (SDL_GetCurrentDisplayMode(0, &di) != 0) {
		warning("Error: %s", SDL_GetError());
		g_system->quit();
	}
	_desktopW = di.w;
	_desktopH = di.h;
#else
	const SDL_VideoInfo *vi = SDL_GetVideoInfo();
	_desktopW = vi->current_w;
	_desktopH = vi->current_h;
#endif
}

Common::Rect ResVmSdlGraphicsManager::getPreferredFullscreenResolution() {
	// Default to the desktop resolution ...
	uint preferredWidth = _desktopW;
	uint preferredHeight = _desktopH;

	// ... unless the user has set a resolution in the configuration file
	const Common::String &fsres = ConfMan.get("fullscreen_res");
	if (fsres != "desktop") {
		uint newW, newH;
		int converted = sscanf(fsres.c_str(), "%ux%u", &newW, &newH);
		if (converted == 2) {
			preferredWidth = newW;
			preferredHeight = newH;
		} else {
			warning("Could not parse 'fullscreen_res' option: expected WWWxHHH, got %s", fsres.c_str());
		}
	}

	return Common::Rect(preferredWidth, preferredHeight);
}

void ResVmSdlGraphicsManager::resetGraphicsScale() {
	setGraphicsMode(0);
}

void ResVmSdlGraphicsManager::setFeatureState(OSystem::Feature f, bool enable) {
	switch (f) {
		case OSystem::kFeatureFullscreenMode:
			_fullscreen = enable;
			break;
		case OSystem::kFeatureAspectRatioCorrection:
			_lockAspectRatio = enable;
			break;
		default:
			break;
	}
}

bool ResVmSdlGraphicsManager::getFeatureState(OSystem::Feature f) {
	switch (f) {
		case OSystem::kFeatureFullscreenMode:
			return _fullscreen;
		case OSystem::kFeatureAspectRatioCorrection:
			return _lockAspectRatio;
		default:
			return false;
	}
}

const OSystem::GraphicsMode *ResVmSdlGraphicsManager::getSupportedGraphicsModes() const {
	return s_supportedGraphicsModes;
}

int ResVmSdlGraphicsManager::getDefaultGraphicsMode() const {
	return 0;// ResidualVM: not use it
}

void ResVmSdlGraphicsManager::beginGFXTransaction() {
	// ResidualVM: not use it
}

OSystem::TransactionError ResVmSdlGraphicsManager::endGFXTransaction() {
	// ResidualVM: not use it
	return OSystem::kTransactionSuccess;
}

#ifdef USE_RGB_COLOR
Common::List<Graphics::PixelFormat> ResVmSdlGraphicsManager::getSupportedFormats() const {
	// ResidualVM: not use it
	return _supportedFormats;
}
#endif

bool ResVmSdlGraphicsManager::setGraphicsMode(int mode) {
	// ResidualVM: not use it
	return true;
}

int ResVmSdlGraphicsManager::getGraphicsMode() const {
	// ResidualVM: not use it
	return 0;
}

void ResVmSdlGraphicsManager::initSize(uint w, uint h, const Graphics::PixelFormat *format) {
	// ResidualVM: not use it
}

void ResVmSdlGraphicsManager::launcherInitSize(uint w, uint h) {
	closeOverlay();
	setupScreen(w, h, false, false);
}

void ResVmSdlGraphicsManager::copyRectToScreen(const void *src, int pitch, int x, int y, int w, int h) {
	// ResidualVM: not use it
}

Graphics::Surface *ResVmSdlGraphicsManager::lockScreen() {
	return NULL; // ResidualVM: not use it
}

void ResVmSdlGraphicsManager::unlockScreen() {
	// ResidualVM: not use it
}

void ResVmSdlGraphicsManager::fillScreen(uint32 col) {
	// ResidualVM: not use it
}

void ResVmSdlGraphicsManager::setPalette(const byte *colors, uint start, uint num) {
	// ResidualVM: not use it
}

void ResVmSdlGraphicsManager::grabPalette(byte *colors, uint start, uint num) {
	// ResidualVM: not use it
}

void ResVmSdlGraphicsManager::setCursorPalette(const byte *colors, uint start, uint num) {
	// ResidualVM: not use it
}

void ResVmSdlGraphicsManager::setShakePos(int shake_pos) {
	// ResidualVM: not use it
}

void ResVmSdlGraphicsManager::setFocusRectangle(const Common::Rect &rect) {
	// ResidualVM: not use it
}

void ResVmSdlGraphicsManager::clearFocusRectangle() {
	// ResidualVM: not use it
}

#pragma mark -
#pragma mark --- Overlays ---
#pragma mark -

void ResVmSdlGraphicsManager::showOverlay() {
	if (_overlayVisible)
		return;

	_overlayVisible = true;

	clearOverlay();
}

void ResVmSdlGraphicsManager::hideOverlay() {
	if (!_overlayVisible)
		return;

	_overlayVisible = false;

	clearOverlay();
}

#pragma mark -
#pragma mark --- Mouse ---
#pragma mark -

bool ResVmSdlGraphicsManager::showMouse(bool visible) {
	SDL_ShowCursor(visible);
	return true;
}

// ResidualVM specific method
bool ResVmSdlGraphicsManager::lockMouse(bool lock) {
#if SDL_VERSION_ATLEAST(2, 0, 0)
	if (lock)
		SDL_SetRelativeMouseMode(SDL_TRUE);
	else
		SDL_SetRelativeMouseMode(SDL_FALSE);
#else
	if (lock)
		SDL_WM_GrabInput(SDL_GRAB_ON);
	else
		SDL_WM_GrabInput(SDL_GRAB_OFF);
#endif
	return true;
}

void ResVmSdlGraphicsManager::setMouseCursor(const void *buf, uint w, uint h, int hotspot_x, int hotspot_y, uint32 keycolor, bool dontScale, const Graphics::PixelFormat *format) {
	// ResidualVM: not use it
}

#pragma mark -
#pragma mark --- On Screen Display ---
#pragma mark -

#ifdef USE_OSD
void OpenGLResVmSdlGraphicsManager::displayMessageOnOSD(const char *msg) {
	// ResidualVM: not use it
}
#endif

bool ResVmSdlGraphicsManager::notifyEvent(const Common::Event &event) {
	//ResidualVM specific:
	switch ((int)event.type) {
		case Common::EVENT_KEYDOWN:
			break;
		case Common::EVENT_KEYUP:
			break;
		default:
			break;
	}

	return false;
}

void ResVmSdlGraphicsManager::notifyVideoExpose() {
	//ResidualVM specific:
	updateScreen();
}

void ResVmSdlGraphicsManager::notifyMousePos(Common::Point mouse) {
	transformMouseCoordinates(mouse);
	// ResidualVM: not use that:
	//setMousePos(mouse.x, mouse.y);
}