/* 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef PLATFORM_3DS_H
#define PLATFORM_3DS_H

#define FORBIDDEN_SYMBOL_EXCEPTION_time_h

#include "backends/base-backend.h"
#include "graphics/paletteman.h"
#include "base/main.h"
#include "audio/mixer_intern.h"
#include "backends/graphics/graphics.h"
#include "backends/log/log.h"
#include "backends/platform/3ds/sprite.h"
#include "common/rect.h"
#include "common/queue.h"
#include "common/ustr.h"
#include "engines/engine.h"

#define TICKS_PER_MSEC 268123

namespace N3DS {

enum MagnifyMode {
	MODE_MAGON,
	MODE_MAGOFF,
};

enum InputMode {
	MODE_HOVER,
	MODE_DRAG,
};

enum GraphicsModeID {
	RGBA8,
	RGB565,
	RGB5A1,
	RGBA4,
	CLUT8
};

enum Screen {
	kScreenTop = 0x10000002,
	kScreenBottom,
	kScreenBoth,
};

enum TransactionState {
	kTransactionNone = 0,
	kTransactionActive = 1,
	kTransactionRollback = 2
};


struct TransactionDetails {
	bool formatChanged, modeChanged;

	TransactionDetails() {
		formatChanged = false;
		modeChanged = false;
	}
};

typedef struct GfxMode3DS {
	Graphics::PixelFormat surfaceFormat;
	GPU_TEXCOLOR textureFormat;
	uint32 textureTransferFlags;
} GfxMode3DS;

struct GfxState {
	bool setup;
	GraphicsModeID gfxModeID;
	const GfxMode3DS *gfxMode;

	GfxState() {
		setup = false;
		gfxModeID = CLUT8;
	}
};


class OSystem_3DS : public EventsBaseBackend, public PaletteManager, public Common::EventObserver {
public:
	OSystem_3DS();
	virtual ~OSystem_3DS();

	volatile bool exiting;
	volatile bool sleeping;

	virtual void initBackend();

	virtual bool hasFeature(OSystem::Feature f);
	virtual void setFeatureState(OSystem::Feature f, bool enable);
	virtual bool getFeatureState(OSystem::Feature f);

	bool pollEvent(Common::Event &event) override;
	bool notifyEvent(const Common::Event &event) override;
	Common::HardwareInputSet *getHardwareInputSet() override;
	Common::KeymapArray getGlobalKeymaps() override;
	Common::KeymapperDefaultBindings *getKeymapperDefaultBindings() override;

	void registerDefaultSettings(const Common::String &target) const override;
	GUI::OptionsContainerWidget *buildBackendOptionsWidget(GUI::GuiObject *boss, const Common::String &name, const Common::String &target) const override;
	void applyBackendSettings() override;

	virtual uint32 getMillis(bool skipRecord = false);
	virtual void delayMillis(uint msecs);
	virtual void getTimeAndDate(TimeDate &td, bool skipRecord = false) const;

	virtual Common::MutexInternal *createMutex();

	virtual void logMessage(LogMessageType::Type type, const char *message);

	virtual Audio::Mixer *getMixer();
	virtual PaletteManager *getPaletteManager() { return this; }
	virtual Common::String getSystemLanguage() const;
	virtual void fatalError();
	virtual void quit();

	virtual Common::Path getDefaultConfigFileName();
	void addSysArchivesToSearchSet(Common::SearchSet &s, int priority) override;

	// Graphics
	inline Graphics::PixelFormat getScreenFormat() const { return _pfGame; }
	virtual Common::List<Graphics::PixelFormat> getSupportedFormats() const;
	void initSize(uint width, uint height,
	              const Graphics::PixelFormat *format = NULL);
	virtual int getScreenChangeID() const { return _screenChangeId; };
	GraphicsModeID chooseMode(Graphics::PixelFormat *format);
	bool setGraphicsMode(GraphicsModeID modeID);

	void beginGFXTransaction();
	OSystem::TransactionError endGFXTransaction();
	int16 getHeight(){ return _gameHeight; }
	int16 getWidth(){ return _gameWidth; }
	float getScaleRatio() const;
	void setPalette(const byte *colors, uint start, uint num);
	void grabPalette(byte *colors, uint start, uint num) const;
	void copyRectToScreen(const void *buf, int pitch, int x, int y, int w,
	                      int h);
	Graphics::Surface *lockScreen();
	void unlockScreen();
	void updateScreen();
	void setShakePos(int shakeXOffset, int shakeYOffset);
	void setFocusRectangle(const Common::Rect &rect);
	void clearFocusRectangle();
	void showOverlay(bool inGUI);
	void hideOverlay();
	bool isOverlayVisible() const { return _overlayVisible; }
	Graphics::PixelFormat getOverlayFormat() const;
	void clearOverlay();
	void grabOverlay(Graphics::Surface &surface);
	void copyRectToOverlay(const void *buf, int pitch, int x, int y, int w,
	                       int h);
	virtual int16 getOverlayHeight() const;
	virtual int16 getOverlayWidth() const;
	void displayMessageOnOSD(const Common::U32String &msg) override;
	void displayActivityIconOnOSD(const Graphics::Surface *icon) override;

	bool showMouse(bool visible);
	void warpMouse(int x, int y);
	void setMouseCursor(const void *buf, uint w, uint h, int hotspotX,
	                    int hotspotY, uint32 keycolor, bool dontScale = false,
	                    const Graphics::PixelFormat *format = NULL, const byte *mask = NULL);
	void setCursorPalette(const byte *colors, uint start, uint num);

	// Transform point from touchscreen coords into gamescreen coords
	void transformPoint(touchPosition &point);
	// Clip point to gamescreen coords
	void clipPoint(touchPosition &point);

	void setCursorDelta(float deltaX, float deltaY);

	void updateFocus();
	void updateMagnify();
	void updateBacklight();
	void updateConfig();
	void updateSize();

private:
	void init3DSGraphics();
	void destroy3DSGraphics();
	void initAudio();
	void destroyAudio();
	void initEvents();
	void destroyEvents();

	void flushGameScreen();
	void flushCursor();

	virtual Common::Path getDefaultLogFileName();
	virtual Common::WriteStream *createLogFile();

protected:
	Audio::MixerImpl *_mixer;
	Backends::Log::Log *_logger;

private:
	u16 _gameWidth, _gameHeight;
	u16 _gameTopX, _gameTopY;
	u16 _gameBottomX, _gameBottomY;

	// Audio
	Thread audioThread;

	// Graphics
	GraphicsModeID _graphicsModeID;
	TransactionState _transactionState;
	TransactionDetails _transactionDetails;

	GfxState _gfxState, _oldGfxState;
	Graphics::PixelFormat _pfDefaultTexture;
	Graphics::PixelFormat _pfGame, _oldPfGame;
	Graphics::PixelFormat _pfCursor;
	byte _palette[3 * 256];
	byte _cursorPalette[3 * 256];
	uint32 _paletteMap[256];

	Graphics::Surface _gameScreen;
	bool _gameTextureDirty;
	Sprite _gameTopTexture;
	Sprite _gameBottomTexture;
	Sprite _overlay;
	Sprite _activityIcon;
	Sprite _osdMessage;
	bool _filteringEnabled;

	enum {
		kOSDMessageDuration = 800
	};
	uint32 _osdMessageEndTime;

	int _screenShakeXOffset;
	int _screenShakeYOffset;
	bool _overlayVisible;
	bool _overlayInGUI;
	int _screenChangeId;

	DVLB_s *_dvlb;
	shaderProgram_s _program;
	int _projectionLocation;
	int _modelviewLocation;
	C3D_Mtx _projectionTop;
	C3D_Mtx _projectionBottom;
	C3D_RenderTarget* _renderTargetTop;
	C3D_RenderTarget* _renderTargetBottom;

	// Focus
	Common::Rect _focusRect;
	bool _focusDirty;
	C3D_Mtx _focusMatrix;
	int _focusPosX, _focusPosY;
	int _focusTargetPosX, _focusTargetPosY;
	float _focusStepPosX, _focusStepPosY;
	float _focusScaleX, _focusScaleY;
	float _focusTargetScaleX, _focusTargetScaleY;
	float _focusStepScaleX, _focusStepScaleY;
	uint32 _focusClearTime;

	// Events
	Thread _eventThread;
	Thread _timerThread;
	Common::Queue<Common::Event> _eventQueue;

	// Cursor
	Graphics::Surface _cursor;
	Sprite _cursorTexture;
	bool _cursorPaletteEnabled;
	bool _cursorVisible;
	bool _cursorScalable;
	float _cursorScreenX, _cursorScreenY;
	float _cursorOverlayX, _cursorOverlayY;
	float _cursorDeltaX, _cursorDeltaY;
	int _cursorHotspotX, _cursorHotspotY;
	uint32 _cursorKeyColor;

	// Magnify
	MagnifyMode _magnifyMode;
	u16 _magX, _magY;
	u16 _magWidth, _magHeight;
	u16 _magCenterX, _magCenterY;

	Common::Path _logFilePath;

public:
	// Pause
	PauseToken _sleepPauseToken;

	bool _showCursor;
	bool _snapToBorder;
	bool _stretchToFit;
	Screen _screen;
};

} // namespace N3DS

#endif