/* 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.
 *
 */
#ifndef DRAGONS_DRAGONS_H
#define DRAGONS_DRAGONS_H

#include "gui/EventRecorder.h"
#include "engines/engine.h"
#include "dragons/specialopcodes.h"

namespace Dragons {

enum {
	kGameIdDragons = 1
};

struct DragonsGameDescription {
	ADGameDescription desc;
	int gameId;
};

struct SaveHeader {
	Common::String description;
	uint32 version;
	uint32 flags;
	uint32 saveDate;
	uint32 saveTime;
	uint32 playTime;
	Graphics::Surface *thumbnail;
};

enum kReadSaveHeaderError {
	kRSHENoError = 0,
	kRSHEInvalidType = 1,
	kRSHEInvalidVersion = 2,
	kRSHEIoError = 3
};

enum Flags {
	ENGINE_FLAG_1 = 1,
	ENGINE_FLAG_2 = 2,
	ENGINE_FLAG_4 = 4,
	ENGINE_FLAG_8 = 8,
	ENGINE_FLAG_10 = 0x10,
	ENGINE_FLAG_20 = 0x20,
	ENGINE_FLAG_40 = 0x40,
	ENGINE_FLAG_80 = 0x80, // Inventory bag visible
	ENGINE_FLAG_100 = 0x100,
	ENGINE_FLAG_200 = 0x200,
	ENGINE_FLAG_400 = 0x400,
	ENGINE_FLAG_800 = 0x800,
	ENGINE_FLAG_1000_SUBTITLES_DISABLED = 0x1000,
	ENGINE_FLAG_8000     =     0x8000, // speech dialog is playing.

	ENGINE_FLAG_10000    =    0x10000,
	ENGINE_FLAG_20000    =    0x20000,
	ENGINE_FLAG_80000    =    0x80000,
	ENGINE_FLAG_100000   =   0x100000,
	ENGINE_FLAG_200000   =   0x200000,
	ENGINE_FLAG_400000   =   0x400000,
	ENGINE_FLAG_2000000  =  0x2000000,
	ENGINE_FLAG_4000000  =  0x4000000,
	ENGINE_FLAG_8000000  =  0x8000000,
	ENGINE_FLAG_20000000 = 0x20000000,
	ENGINE_FLAG_80000000 = 0x80000000   //Flicker idle animation running.
};

enum UnkFlags {
	ENGINE_UNK1_FLAG_1 = 1,
	ENGINE_UNK1_FLAG_2 = 2,
	ENGINE_UNK1_FLAG_4 = 4,
	ENGINE_UNK1_FLAG_8 = 8,
	ENGINE_UNK1_FLAG_10 = 0x10,
	ENGINE_UNK1_FLAG_20 = 0x20,
	ENGINE_UNK1_FLAG_40 = 0x40,
	ENGINE_UNK1_FLAG_80 = 0x80
};

struct PaletteCyclingInstruction {
	int16 paletteType;
	int16 startOffset;
	int16 endOffset;
	int16 updateInterval;
	int16 updateCounter;
};

class BigfileArchive;
class BackgroundResourceLoader;
class Cursor;
class Credits;
class DragonFLG;
class DragonImg;
class DragonOBD;
class DragonRMS;
class DragonVAR;
class DragonINIResource;
class FontManager;
class Inventory;
class Scene;
class Screen;
class ActorManager;
class SequenceOpcodes;
class ScriptOpcodes;
class Talk;
class SoundManager;
class StrPlayer;
struct DragonINI;


class DragonsEngine : public Engine {
public:
	DragonOBD *_dragonOBD;
	DragonImg *_dragonImg;
	DragonRMS *_dragonRMS;
	ActorManager *_actorManager;
	DragonINIResource *_dragonINIResource;
	FontManager *_fontManager;
	ScriptOpcodes *_scriptOpcodes;
	Scene *_scene;
	uint16 _flickerInitialSceneDirection;
	Inventory *_inventory;
	Cursor *_cursor;
	Credits *_credits;
	Talk *_talk;
	SoundManager *_sound;
	StrPlayer *_strPlayer;

	PaletteCyclingInstruction _paletteCyclingTbl[8];

	bool _isLoadingDialogAudio;
	uint16 _videoFlags; // TODO move to screen?

	void loadCurrentSceneMsf();

	Screen *_screen;
	uint16 _sceneId1; //TODO wire this up. I think it might be where to restore save game from?

private:
	Common::Language _language;
	BigfileArchive *_bigfileArchive;
	DragonFLG *_dragonFLG;
	DragonVAR *_dragonVAR;
	BackgroundResourceLoader *_backgroundResourceLoader;
	SequenceOpcodes *_sequenceOpcodes;
	uint32 _nextUpdatetime;
	uint32 _flags;
	uint32 _unkFlags1;
	Common::Point _cursorPosition;
	uint32 _flickerIdleCounter;
	uint32 _bit_flags_8006fbd8;
	//unk

	uint16 _run_func_ptr_unk_countdown_timer;

	uint32 _randomState;

	// input
	bool _leftMouseButtonUp;
	bool _leftMouseButtonDown;
	bool _rightMouseButtonUp;
	bool _iKeyUp;
	bool _downKeyUp;
	bool _upKeyUp;
	bool _enterKeyUp;

	bool _leftKeyDown;
	bool _leftKeyUp;
	bool _rightKeyDown;
	bool _rightKeyUp;
	bool _wKeyDown;
	bool _aKeyDown;
	bool _sKeyDown;
	bool _dKeyDown;
	bool _oKeyDown;
	bool _pKeyDown;

	bool _debugMode;
	bool _isGamePaused;
	bool _inMenu;

	void (*_sceneUpdateFunction)();
	void (*_vsyncUpdateFunction)();
protected:
	virtual bool hasFeature(EngineFeature f) const override;
public:
	DragonsEngine(OSystem *syst, const ADGameDescription *desc);
	~DragonsEngine();

	void updateEvents();
	Common::Error run() override;

	Common::String getSavegameFilename(int num);
	static Common::String getSavegameFilename(const Common::String &target, int num);
	static kReadSaveHeaderError readSaveHeader(Common::SeekableReadStream *in, SaveHeader &header, bool skipThumbnail = true);

	Common::Error loadGameState(int slot) override;
	bool canLoadGameStateCurrently() override;
	Common::Error saveGameState(int slot, const Common::String &desc, bool isAutosave) override;
	bool canSaveGameStateCurrently() override;

	void updateActorSequences();
	void setFlags(uint32 flags);
	void clearFlags(uint32 flags);
	uint32 getMultipleFlags(uint32 flags);
	uint32 getAllFlags();
	void setAllFlags(uint32 flags);
	bool isFlagSet(uint32 flag);
	bool isUnkFlagSet(uint32 flag);

	void setUnkFlags(uint32 flags);
	void clearUnkFlags(uint32 flags);

	byte *getBackgroundPalette();
	DragonINI *getINI(uint32 index);
	uint16 getVar(uint16 offset);
	void setVar(uint16 offset, uint16 value);
	uint16 getCurrentSceneId() const;

	void waitForFrames(uint16 numFrames);
	void waitForFramesAllowSkip(uint16 numFrames);


	void playOrStopSound(uint16 soundId);

	//TODO what are these functions really doing?
	void call_fade_related_1f();
	void fade_related(uint32 flags);

	uint16 ipt_img_file_related();
	void performAction();

	void reset_screen_maybe();

	void init();
	void loadScene(uint16 sceneId);

	void reset();

	void runSceneUpdaterFunction();
	void setSceneUpdateFunction(void (*newUpdateFunction)());
	void (*getSceneUpdateFunction())();

	void setVsyncUpdateFunction(void (*newUpdateFunction)());
	bool isVsyncUpdaterFunctionRunning();
	void runVsyncUpdaterFunction();

	bool isActionButtonPressed();
	bool isLeftKeyPressed();
	bool isRightKeyPressed();
	bool isUpKeyPressed();
	bool isDownKeyPressed();
	bool isSquareButtonPressed();
	bool isTriangleButtonPressed();
	bool isCircleButtonPressed();
	bool isCrossButtonPressed();
	bool isL1ButtonPressed();
	bool isR1ButtonPressed();
	bool checkForActionButtonRelease();
	bool checkForDownKeyRelease();
	bool checkForUpKeyRelease();

	bool isDebugMode();

	uint16 getRand(uint16 max);

	void setupPalette1();

	bool isInMenu();

	//TODO this logic should probably go in its own class.
	uint32 getBigFileInfoTblFromDragonEXE();
	uint32 getFontOffsetFromDragonEXE();
	uint32 getSpeechTblOffsetFromDragonEXE();
	uint32 getCutscenePaletteOffsetFromDragonEXE();
	uint32 defaultResponseOffsetFromDragonEXE();
private:
	bool savegame(const char *filename, const char *description);
	bool loadgame(const char *filename);
	void gameLoop();
	void updateHandler();
	void updatePathfindingActors();
	void updatePaletteCycling();
	void updateFlickerIdleAnimation();
	void updateCamera();

	uint32 calulateTimeLeft();
	void wait();
	uint16 getIniFromImg();
	void runINIScripts();
	void engineFlag0x20UpdateFunction();


	bool isInputEnabled();
	bool checkForInventoryButtonRelease();

	void walkFlickerToObject();

	void seedRandom(int32 seed);
	uint32 shuffleRandState();

	void initializeSound();

	void SomeInitSound_fun_8003f64c();

	void initSubtitleFlag();

	void mainMenu();
};

DragonsEngine *getEngine();

} // End of namespace Dragons

#endif //DRAGONS_DRAGONS_H