/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM 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.
 *
 * $URL$
 * $Id$
 *
 */

#ifndef INTERFACE_MANAGER_H
#define INTERFACE_MANAGER_H

#include "common/scummsys.h"
#include "graphics/surface.h"
#include "common/system.h"

#include "graphics/surface.h"
#include "graphics/fontman.h"

#include "gui/dialog.h"
#include "gui/ThemeParser.h"
#include "graphics/VectorRenderer.h"

namespace GUI {

#define g_InterfaceManager	(GUI::InterfaceManager::instance())

struct WidgetDrawData;
class InterfaceManager;

struct WidgetDrawData {
	Common::Array<Graphics::DrawStep*> _steps;

	bool _cached;
	Graphics::Surface *_surfaceCache;
	uint32 _cachedW, _cachedH;

	~WidgetDrawData() {
		for (uint i = 0; i < _steps.size(); ++i)
			delete _steps[i];

		_steps.clear();

		if (_surfaceCache) {
			_surfaceCache->free();
			delete _surfaceCache;
		}
	}
};

class InterfaceManager : public Common::Singleton<InterfaceManager> {

	typedef Common::String String;
	typedef GUI::Dialog Dialog;

	friend class GUI::Dialog;
	friend class GUI::GuiObject;
	friend class Common::Singleton<SingletonBaseType>;

	static const char *kDrawDataStrings[];
	static const int kMaxDialogDepth = 4;

public:
	enum Graphics_Mode {
		kGfxDisabled = 0,
		kGfxStandard16bit,
		kGfxAntialias16bit
	};

	enum {
		kDoubleClickDelay = 500, // milliseconds
		kCursorAnimateDelay = 250
	};

	enum DrawData {
		kDDMainDialogBackground,
		kDDSpecialColorBackground,
		kDDPlainColorBackground,
		kDDDefaulBackground,

		kDDButtonIdle,
		kDDButtonHover,

		kDDSurface,

		kDDSliderFull,
		kDDSliderEmpty,

		kDDCheckboxEnabled,
		kDDCheckboxDisabled,

		kDDTab,

		kDDScrollbarBase,
		kDDScrollbarButtonTop,
		kDDScrollbarButtonBottom,
		kDDScrollbarHandle,

		kDDPopUp,
		kDDCaret,
		kDDSeparator,
		kDrawDataMAX
	};

	enum FontStyle {
		kFontStyleBold = 0,			//! A bold font. This is also the default font.
		kFontStyleNormal = 1,		//! A normal font.
		kFontStyleItalic = 2,		//! Italic styled font.
		kFontStyleFixedNormal = 3,	//! Fixed size font.
		kFontStyleFixedBold = 4,	//! Fixed size bold font.
		kFontStyleFixedItalic = 5,	//! Fixed size italic font.
		kFontStyleMax
	};

	enum State {
		kStateDisabled,		//! Indicates that the widget is disabled, that does NOT include that it is invisible
		kStateEnabled,		//! Indicates that the widget is enabled
		kStateHighlight		//! Indicates that the widget is highlighted by the user
	};

	//! Widget background type
	enum WidgetBackground {
		kWidgetBackgroundNo,			//! No background at all
		kWidgetBackgroundPlain,			//! Simple background, this may not include borders
		kWidgetBackgroundBorder,		//! Same as kWidgetBackgroundPlain just with a border
		kWidgetBackgroundBorderSmall,	//! Same as kWidgetBackgroundPlain just with a small border
		kWidgetBackgroundEditText,		//! Background used for edit text fields
		kWidgetBackgroundSlider			//! Background used for sliders
	};

	typedef State WidgetStateInfo;

	//! State of the scrollbar
	enum ScrollbarState {
		kScrollbarStateNo,
		kScrollbarStateUp,
		kScrollbarStateDown,
		kScrollbarStateSlider,
		kScrollbarStateSinglePage
	};

	//! Defined the align of the text
	enum TextAlign {
		kTextAlignLeft,		//! Text should be aligned to the left
		kTextAlignCenter,	//! Text should be centered
		kTextAlignRight		//! Text should be aligned to the right
	};

	//! Function used to process areas other than the current dialog
	enum ShadingStyle {
		kShadingNone,		//! No special post processing
		kShadingDim,		//! Dimming unused areas
		kShadingLuminance	//! Converting colors to luminance for unused areas
	};


	InterfaceManager();

	~InterfaceManager() {
		freeRenderer();
		freeScreen();
		delete _parser;
	}

	void setGraphicsMode(Graphics_Mode mode);
	int runGUI();

	void init();

	/** Font management */
	const Graphics::Font *getFont(FontStyle font) const { return _font; }
	int getFontHeight(FontStyle font = kFontStyleBold) const { if (_initOk) return _font->getFontHeight(); return 0; }
	int getStringWidth(const Common::String &str, FontStyle font) const { if (_initOk) return _font->getStringWidth(str); return 0; }
	int getCharWidth(byte c, FontStyle font) const { if (_initOk) return _font->getCharWidth(c); return 0; }

	/** Widget drawing */
	void drawWidgetBackground(const Common::Rect &r, uint16 hints, WidgetBackground background = kWidgetBackgroundPlain, WidgetStateInfo state = kStateEnabled) {}
	void drawButton(const Common::Rect &r, const Common::String &str, WidgetStateInfo state = kStateEnabled, uint16 hints = 0);
	void drawSurface(const Common::Rect &r, const Graphics::Surface &surface, WidgetStateInfo state = kStateEnabled, int alpha = 256, bool themeTrans = false) {}
	void drawSlider(const Common::Rect &r, int width, WidgetStateInfo state = kStateEnabled);
	void drawCheckbox(const Common::Rect &r, const Common::String &str, bool checked, WidgetStateInfo state = kStateEnabled);
	void drawTab(const Common::Rect &r, int tabHeight, int tabWidth, const Common::Array<Common::String> &tabs, int active, uint16 hints, int titleVPad, WidgetStateInfo state = kStateEnabled) {}
	void drawScrollbar(const Common::Rect &r, int sliderY, int sliderHeight, ScrollbarState, WidgetStateInfo state = kStateEnabled);
	void drawPopUpWidget(const Common::Rect &r, const Common::String &sel, int deltax, WidgetStateInfo state = kStateEnabled, TextAlign align = kTextAlignLeft) {}
	void drawCaret(const Common::Rect &r, bool erase, WidgetStateInfo state = kStateEnabled) {}
	void drawLineSeparator(const Common::Rect &r, WidgetStateInfo state = kStateEnabled);

	DrawData getDrawDataId(Common::String &name) {
		for (int i = 0; i < kDrawDataMAX; ++i)
			if (name.compareToIgnoreCase(kDrawDataStrings[i]) == 0)
				return (DrawData)i;

		return (DrawData)-1;
	}

	void addDrawStep(Common::String &drawDataId, Graphics::DrawStep *step);
	bool addDrawData(DrawData data_id, bool cached);

	ThemeParser *parser() {
		return _parser;
	}

	bool ready() {
		return _initOk && _themeOk;
	}

	void refresh() {
		init();
		if (_enabled) {
			_system->showOverlay();
//			CursorMan.replaceCursorPalette(_cursorPal, 0, MAX_CURS_COLORS);
//			CursorMan.replaceCursor(_cursor, _cursorWidth, _cursorHeight, _cursorHotspotX, _cursorHotspotY, 255, _cursorTargetScale);
		}
	}

	void enable() {
		init();
		_system->showOverlay();
		_enabled = true;
	}

	void disable() {
		_system->hideOverlay();
		_enabled = false;
	}

	void deinit() {
		if (_initOk) {
			_system->hideOverlay();
			_initOk = false;
		}
	}

	bool loadTheme() {
		ConfMan.registerDefault("gui_theme", "default");
		Common::String style(ConfMan.get("gui_theme"));

		if (style.compareToIgnoreCase("default") == 0)
			style = "modern";

		return loadTheme(style);
	}

	bool loadTheme(Common::String themeName);

protected:
	template<typename PixelType> void screenInit();

	bool loadThemeXML(Common::String themeName);
	bool loadDefaultXML();

	void unloadTheme() {
		if (!_themeOk)
			return;

		for (int i = 0; i < kDrawDataMAX; ++i) {
			delete _widgets[i];
			_widgets[i] = 0;
		}
	}

	void screenChange() {}

	void freeRenderer() {
		delete _vectorRenderer;
		_vectorRenderer = 0;
	}

	void freeScreen() {
		if (_screen != 0) {
			_screen->free();
			delete _screen;
			_screen = 0;
		}
	}

	Dialog *getTopDialog() const {
		if (_dialogStack.empty())
			return 0;
		return _dialogStack.top();
	}

	bool needThemeReload() {
		return (_themeOk == false || _needThemeLoad == true);
	}


	bool isWidgetCached(DrawData type, const Common::Rect &r);
	void drawCached(DrawData type, const Common::Rect &r);

	inline void drawDD(DrawData type, const Common::Rect &r);

	void addDirtyRect(const Common::Rect &r) {
		_dirtyScreen.extend(r);
	}

	OSystem *_system;
	Graphics::VectorRenderer *_vectorRenderer;
	GUI::ThemeParser *_parser;

	Graphics::Surface *_screen;
	Graphics::Surface *_screenCache;

	int _bytesPerPixel;
	Graphics_Mode _graphicsMode;

	Common::String _fontName;
	const Graphics::Font *_font;

	WidgetDrawData *_widgets[kDrawDataMAX];
	Common::FixedStack<Dialog *, kMaxDialogDepth> _dialogStack;
	Common::Rect _dirtyScreen;

	bool _initOk;
	bool _themeOk;
	bool _caching;
	bool _needThemeLoad;
	bool _enabled;

	struct {
		int16 x, y;	// Position of mouse when the click occured
		uint32 time;	// Time
		int count;	// How often was it already pressed?
	} _lastClick;
};

} // end of namespace GUI.

#endif