/* 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.
 *
 */

#include "common/md5.h"
#include "common/file.h"
#include "common/memstream.h"
#include "common/savefile.h"
#include "common/config-manager.h"
#include "common/debug-channels.h"
#include "common/random.h"
#include "common/textconsole.h"

#include "engines/util.h"

#include "base/plugins.h"
#include "base/version.h"

#include "graphics/cursorman.h"

#include "audio/mididrv.h"
#include "audio/mixer.h"

#include "agi/agi.h"
#include "agi/graphics.h"
#include "agi/inv.h"
#include "agi/sprite.h"
#include "agi/text.h"
#include "agi/keyboard.h"
#include "agi/menu.h"
#include "agi/systemui.h"
#include "agi/words.h"

#include "gui/predictivedialog.h"

namespace Agi {

void AgiEngine::allowSynthetic(bool allow) {
	_allowSynthetic = allow;
}

void AgiEngine::pollTimer() {
	_lastTick += 50;

	while (_system->getMillis() < _lastTick) {
		processEvents();
		_console->onFrame();
		_system->delayMillis(10);
		_system->updateScreen();
	}

	_lastTick = _system->getMillis();
}

void AgiEngine::pause(uint32 msec) {
	uint32 endTime = _system->getMillis() + msec;

	_gfx->setMouseCursor(true); // Busy mouse cursor

	while (_system->getMillis() < endTime) {
		processEvents();
		_system->updateScreen();
		_system->delayMillis(10);
	}
	_gfx->setMouseCursor(); // regular mouse cursor
}

int AgiEngine::agiInit() {
	int ec, i;

	debug(2, "initializing");
	debug(2, "game version = 0x%x", getVersion());

	// initialize with adj.ego.move.to.x.y(0, 0) so to speak
	_game.adjMouseX = _game.adjMouseY = 0;

	// reset all flags to false and all variables to 0
	for (i = 0; i < MAX_FLAGS; i++)
		_game.flags[i] = 0;
	for (i = 0; i < MAX_VARS; i++)
		_game.vars[i] = 0;

	// clear all resources and events
	for (i = 0; i < MAX_DIRECTORY_ENTRIES; i++) {
		memset(&_game.views[i], 0, sizeof(struct AgiView));
		memset(&_game.pictures[i], 0, sizeof(struct AgiPicture));
		memset(&_game.logics[i], 0, sizeof(struct AgiLogic));
		memset(&_game.sounds[i], 0, sizeof(class AgiSound *)); // _game.sounds contains pointers now
		memset(&_game.dirView[i], 0, sizeof(struct AgiDir));
		memset(&_game.dirPic[i], 0, sizeof(struct AgiDir));
		memset(&_game.dirLogic[i], 0, sizeof(struct AgiDir));
		memset(&_game.dirSound[i], 0, sizeof(struct AgiDir));
	}

	// clear view table
	for (i = 0; i < SCREENOBJECTS_MAX; i++)
		memset(&_game.screenObjTable[i], 0, sizeof(struct ScreenObjEntry));

	memset(&_game.addToPicView, 0, sizeof(struct ScreenObjEntry));

	_words->clearEgoWords();

	if (!_menu)
		_menu = new GfxMenu(this, _gfx, _picture, _text);

	_gfx->initPriorityTable();

	// Clear the string buffer on startup, but not when the game restarts, as
	// some scripts expect that the game strings remain unaffected after a
	// restart. An example is script 98 in SQ2, which is not invoked on restart
	// to ask Ego's name again. The name is supposed to be maintained in string 1.
	// Fixes bug #3292784.
	if (!_restartGame) {
		for (i = 0; i < MAX_STRINGS; i++)
			_game.strings[i][0] = 0;
	}

	// setup emulation

	switch (getVersion() >> 12) {
	case 2:
		debug("Emulating Sierra AGI v%x.%03x",
				(int)(getVersion() >> 12) & 0xF,
				(int)(getVersion()) & 0xFFF);
		break;
	case 3:
		debug("Emulating Sierra AGI v%x.002.%03x",
				(int)(getVersion() >> 12) & 0xF,
				(int)(getVersion()) & 0xFFF);
		break;
	}

	if (getPlatform() == Common::kPlatformAmiga)
		_game.gameFlags |= ID_AMIGA;

	if (getFeatures() & GF_AGDS)
		_game.gameFlags |= ID_AGDS;

	if (_game.gameFlags & ID_AMIGA)
		debug(1, "Amiga padded game detected.");

	if (_game.gameFlags & ID_AGDS)
		debug(1, "AGDS mode enabled.");

	ec = _loader->init();	// load vol files, etc

	if (ec == errOK)
		ec = _loader->loadObjects(OBJECTS);

	// note: demogs has no words.tok
	if (ec == errOK)
		ec = _loader->loadWords(WORDS);

	// Load logic 0 into memory
	if (ec == errOK)
		ec = _loader->loadResource(RESOURCETYPE_LOGIC, 0);

#ifdef __DS__
	// Normally, the engine loads the predictive text dictionary when the predictive dialog
	// is shown.  On the DS version, the word completion feature needs the dictionary too.

	// FIXME - loadDict() no long exists in AGI as this has been moved to within the
	// GUI Predictive Dialog, but DS Word Completion is probably broken due to this...
#endif

	_egoHoldKey = false;

	_game.mouseFence.setWidth(0); // Reset

	return ec;
}

/*
 * Public functions
 */

void AgiEngine::agiUnloadResources() {
	int i;

	// Make sure logic 0 is always loaded
	for (i = 1; i < MAX_DIRECTORY_ENTRIES; i++) {
		_loader->unloadResource(RESOURCETYPE_LOGIC, i);
	}
	for (i = 0; i < MAX_DIRECTORY_ENTRIES; i++) {
		_loader->unloadResource(RESOURCETYPE_VIEW, i);
		_loader->unloadResource(RESOURCETYPE_PICTURE, i);
		_loader->unloadResource(RESOURCETYPE_SOUND, i);
	}
}

int AgiEngine::agiDeinit() {
	int ec;

	_words->clearEgoWords();		// remove all words from memory
	agiUnloadResources();	// unload resources in memory
	_loader->unloadResource(RESOURCETYPE_LOGIC, 0);
	ec = _loader->deinit();
	unloadObjects();
	_words->unloadDictionary();

	clearImageStack();

	return ec;
}

int AgiEngine::agiLoadResource(int16 resourceType, int16 resourceNr) {
	int i;

	i = _loader->loadResource(resourceType, resourceNr);

	// WORKAROUND: Patches broken picture 147 in a corrupted Amiga version of Gold Rush! (v2.05 1989-03-09).
	// The picture can be seen in room 147 after dropping through the outhouse's hole in room 146.
	if (i == errOK && getGameID() == GID_GOLDRUSH && resourceType == RESOURCETYPE_PICTURE && resourceNr == 147 && _game.dirPic[resourceNr].len == 1982) {
		uint8 *pic = _game.pictures[resourceNr].rdata;
		Common::MemoryReadStream picStream(pic, _game.dirPic[resourceNr].len);
		Common::String md5str = Common::computeStreamMD5AsString(picStream, _game.dirPic[resourceNr].len);
		if (md5str == "1c685eb048656cedcee4eb6eca2cecea") {
			pic[0x042] = 0x4B; // 0x49 -> 0x4B
			pic[0x043] = 0x66; // 0x26 -> 0x66
			pic[0x204] = 0x68; // 0x28 -> 0x68
			pic[0x6C0] = 0x2D; // 0x25 -> 0x2D
			pic[0x6F0] = 0xF0; // 0x70 -> 0xF0
			pic[0x734] = 0x6F; // 0x2F -> 0x6F
		}
	}

	return i;
}

int AgiEngine::agiUnloadResource(int16 resourceType, int16 resourceNr) {
	return _loader->unloadResource(resourceType, resourceNr);
}

struct GameSettings {
	const char *gameid;
	const char *description;
	byte id;
	uint32 features;
	const char *detectname;
};

AgiBase::AgiBase(OSystem *syst, const AGIGameDescription *gameDesc) : Engine(syst), _gameDescription(gameDesc) {
	_noSaveLoadAllowed = false;

	_rnd = new Common::RandomSource("agi");
	_sound = 0;

	_fontData = nullptr;
	_fontDataAllocated = nullptr;

	initFeatures();
	initVersion();
}

AgiBase::~AgiBase() {
	delete _rnd;

	delete _sound;

	free(_fontDataAllocated);
}

void AgiBase::initRenderMode() {
	Common::Platform platform = Common::parsePlatform(ConfMan.get("platform"));
	Common::RenderMode configRenderMode = Common::parseRenderMode(ConfMan.get("render_mode").c_str());

	// Default to EGA PC rendering
	_renderMode = RENDERMODE_EGA;

	switch (platform) {
	case Common::kPlatformDOS:
		switch (configRenderMode) {
		case Common::kRenderCGA:
			_renderMode = RENDERMODE_CGA;
			break;
		// Hercules is not supported atm
		//case Common::kRenderHercA:
		//case Common::kRenderHercG:
		//	_renderMode = RENDERMODE_HERCULES;
		//	break;
		default:
			break;
		}
		break;
	case Common::kPlatformAmiga:
		_renderMode = RENDERMODE_AMIGA;
		break;
	case Common::kPlatformApple2GS:
		_renderMode = RENDERMODE_APPLE_II_GS;
		break;
	case Common::kPlatformAtariST:
		_renderMode = RENDERMODE_ATARI_ST;
		break;
	default:
		break;
	}

	// If render mode is explicitly set, force rendermode
	switch (configRenderMode) {
	case Common::kRenderAmiga:
		_renderMode = RENDERMODE_AMIGA;
		break;
	case Common::kRenderApple2GS:
		_renderMode = RENDERMODE_APPLE_II_GS;
		break;
	case Common::kRenderAtariST:
		_renderMode = RENDERMODE_ATARI_ST;
		break;
	default:
		break;
	}

	if (getFeatures() & (GF_AGI256 | GF_AGI256_2)) {
		// If current game is AGI256, switch (force) to VGA render mode
		_renderMode = RENDERMODE_VGA;
	}
}

void AgiBase::initFont() {
	// We are currently using the custom font for all fanmade games
	if (getFeatures() & (GF_FANMADE | GF_AGDS)) {
		// fanmade game, use custom font for now
		_fontData = fontData_FanGames; // our (own?) custom font, that supports umlauts etc.
		return;
	}

	switch (_renderMode) {
	case RENDERMODE_AMIGA:
		loadFontAmigaPseudoTopaz();
		//_fontData = fontData_Amiga; // use Amiga Topaz font
		break;
	case RENDERMODE_APPLE_II_GS:
		// Special font, stored in file AGIFONT
		loadFontAppleIIgs();
		break;
	case RENDERMODE_ATARI_ST:
		// TODO: Atari ST uses another font
		// Seems to be the standard Atari ST 8x8 system font

	case RENDERMODE_CGA:
	case RENDERMODE_EGA:
	case RENDERMODE_VGA:
		switch (getGameID()) {
		case GID_MICKEY:
			// load mickey mouse font from interpreter file
			loadFontMickey();
			break;
		default:
			break;
		}
		break;

	default:
		break;
	}

	if (!_fontData) {
		// no font asigned?
		switch (getGameID()) {
		case GID_MICKEY:
		case GID_TROLL:
		case GID_WINNIE:
			// use IBM font for pre-AGI games as standard
			_fontData = fontData_IBM;
			break;
		default:
			// for everything else use Sierra PC font
			_fontData = fontData_Sierra;
			break;
		}
	}
}

// We load the Mickey Mouse font from MICKEY.EXE
void AgiBase::loadFontMickey() {
	Common::File interpreterFile;
	int32 interpreterFileSize = 0;
	byte *fontData = nullptr;

	if (!interpreterFile.open("mickey.exe")) {
		// Continue, if file not found
		warning("Could not open file 'mickey.exe' for Mickey Mouse font");
		return;
	}

	interpreterFileSize = interpreterFile.size();
	if (interpreterFileSize != 55136) {
		// unexpected file size
		interpreterFile.close();
		warning("File 'mickey.exe': unexpected file size");
		return;
	}
	interpreterFile.seek(32476); // offset of font data

	// allocate space for font bitmap data
	fontData = (uint8 *)calloc(256, 8);
	_fontData = fontData;
	_fontDataAllocated = fontData;
 
	// read font data, is already in the format that we need (plain bitmap 8x8)
	interpreterFile.read(fontData, 256 * 8);
	interpreterFile.close();
}

// we create a bitmap out of the topaz data used in parallaction (which is normally found in staticres.cpp)
// it's a recreation of the Amiga Topaz font but not really accurate
void AgiBase::loadFontAmigaPseudoTopaz() {
	const byte *topazStart = fontData_AmigaPseudoTopaz + 32;
	const byte *topazHeader = topazStart + 78;
	const byte *topazData = nullptr;
	const byte *topazLocations = nullptr;
	byte *fontData = nullptr;
	uint16 topazHeight = 0;
	uint16 topazWidth = 0;
	uint16 topazModulo = 0;
	uint32 topazDataOffset = 0;
	uint32 topazLocationOffset = 0;
	byte   topazLowChar = 0;
	byte   topazHighChar = 0;
	uint16 topazTotalChars = 0;
	uint16 topazBitLength = 0;
	uint16 topazBitOffset = 0;
	uint16 topazByteOffset = 0;

	// allocate space for font bitmap data
	fontData = (uint8 *)calloc(256, 8);
	_fontData = fontData;
	_fontDataAllocated = fontData;

	topazHeight = READ_BE_UINT16(topazHeader + 0);
	topazWidth = READ_BE_UINT16(topazHeader + 4);

	// we expect 8x8
	assert(topazHeight == 8);
	assert(topazWidth == 8);

	topazLowChar = topazHeader[12];
	topazHighChar = topazHeader[13];
	topazTotalChars = topazHighChar - topazLowChar + 1;
	topazDataOffset = READ_BE_UINT32(topazHeader + 14);
	topazModulo = READ_BE_UINT16(topazHeader + 18);
	topazLocationOffset = READ_BE_UINT32(topazHeader + 20);

	// Security checks
	assert(topazLowChar == ' ');
	assert(topazHighChar == 0xFF);

	// copy first 32 characters over
	memcpy(fontData, fontData_Sierra, FONT_DISPLAY_WIDTH * 32);
	fontData += FONT_DISPLAY_WIDTH * 32;

	// now actually convert from topaz data
	topazData = topazStart + topazDataOffset;
	topazLocations = topazStart + topazLocationOffset;

	for (uint16 curChar = 0; curChar < topazTotalChars; curChar++) {
		topazBitOffset = READ_BE_UINT16(topazLocations + (curChar * 4) + 0);
		topazBitLength = READ_BE_UINT16(topazLocations + (curChar * 4) + 2);

		if (topazBitLength == 8) {
			assert((topazBitOffset & 7) == 0);

			topazByteOffset = topazBitOffset >> 3;
			for (uint16 curHeight = 0; curHeight < topazHeight; curHeight++) {
				*fontData = topazData[topazByteOffset];
				fontData++;
				topazByteOffset += topazModulo;
			}
		} else {
			memset(fontData, 0, 8);
			fontData += 8;
		}
	}
}

void AgiBase::loadFontAppleIIgs() {
	Common::File fontFile;
	uint16 headerIIgs_OffsetMacHeader = 0;
	uint16 headerIIgs_Version = 0;
	uint16 macRecord_FirstChar = 0;
	uint16 macRecord_LastChar = 0;
	int16 macRecord_MaxKern = 0;
	uint16 macRecord_RectHeight = 0;
	uint16 macRecord_StrikeWidth = 0;
	uint16 strikeDataLen = 0;
	byte *strikeDataPtr = nullptr;
	uint16 actualCharacterCount = 0;
	uint16 totalCharacterCount = 0;
	uint16 *locationTablePtr = nullptr;
	uint16 *offsetWidthTablePtr = nullptr;

	uint16 curCharNr = 0;
	uint16 curRow = 0;
	uint16 curLocation = 0;
	uint16 curLocationBytes = 0;
	uint16 curLocationBits = 0;
	uint16 curCharOffsetWidth = 0;
	uint16 curCharOffset = 0;
	uint16 curCharWidth = 0;
	uint16 curStrikeWidth = 0;

	uint16 curPixelNr = 0;
	uint16 curBitMask = 0;
	int16 positionAdjust = 0;
	byte curByte = 0;
	byte fontByte = 0;

	uint16 strikeRowOffset = 0;
	uint16 strikeCurOffset = 0;

	byte *fontData = nullptr;

	if (!fontFile.open("agifont")) {
		// Continue,
		// This also happens when the user selected Apple IIgs as render for the palette for non-AppleIIgs games
		warning("Could not open file 'agifont' for Apple IIgs font");
		return;
	}

	// Apple IIgs header
	headerIIgs_OffsetMacHeader = fontFile.readUint16LE();
	fontFile.skip(2); // font family
	fontFile.skip(2); // font style
	fontFile.skip(2); // point size
	headerIIgs_Version = fontFile.readUint16LE();
	fontFile.skip(2); // bounds type
	// end of Apple IIgs header
	// Macintosh font record
	fontFile.skip(2); // font type
	macRecord_FirstChar = fontFile.readUint16LE();
	macRecord_LastChar = fontFile.readUint16LE();
	fontFile.skip(2); // max width
	macRecord_MaxKern = fontFile.readSint16LE();
	fontFile.skip(2); // negative descent
	fontFile.skip(2); // rect width
	macRecord_RectHeight = fontFile.readUint16LE();
	fontFile.skip(2); // low word ptr table
	fontFile.skip(2); // font ascent
	fontFile.skip(2); // font descent
	fontFile.skip(2); // leading
	macRecord_StrikeWidth = fontFile.readUint16LE();

	// security-checks
	if (headerIIgs_OffsetMacHeader != 6)
		error("AppleIIgs-font: unexpected header");
	if (headerIIgs_Version != 0x0101)
		error("AppleIIgs-font: not a 1.1 font");
	if ((macRecord_FirstChar != 0) || (macRecord_LastChar != 255))
		error("AppleIIgs-font: unexpected characters");
	if (macRecord_RectHeight != 8)
		error("AppleIIgs-font: expected 8x8 font");

	// Calculate table sizes
	strikeDataLen = macRecord_StrikeWidth * macRecord_RectHeight * 2;
	actualCharacterCount = (macRecord_LastChar - macRecord_FirstChar + 1);
	totalCharacterCount = actualCharacterCount + 2; // replacement-char + extra character

	// Allocate memory for tables
	strikeDataPtr = (byte *)calloc(strikeDataLen, 1);
	locationTablePtr = (uint16 *)calloc(totalCharacterCount, 2); // 1 word per character
	offsetWidthTablePtr = (uint16 *)calloc(totalCharacterCount, 2); // ditto

	// read tables
	fontFile.read(strikeDataPtr, strikeDataLen);
	for (curCharNr = 0; curCharNr < totalCharacterCount; curCharNr++) {
		locationTablePtr[curCharNr] = fontFile.readUint16LE();
	}
	for (curCharNr = 0; curCharNr < totalCharacterCount; curCharNr++) {
		offsetWidthTablePtr[curCharNr] = fontFile.readUint16LE();
	}
	fontFile.close();

	// allocate space for font bitmap data
	fontData = (uint8 *)calloc(256, 8);
	_fontData = fontData;
	_fontDataAllocated = fontData;

	// extract font bitmap data
	for (curCharNr = 0; curCharNr < actualCharacterCount; curCharNr++) {
		curCharOffsetWidth = offsetWidthTablePtr[curCharNr];
		curLocation = locationTablePtr[curCharNr];
		if (curCharOffsetWidth == 0xFFFF) {
			// character does not exist in font, use replacement character instead
			curCharOffsetWidth = offsetWidthTablePtr[actualCharacterCount];
			curLocation = locationTablePtr[actualCharacterCount];
			curStrikeWidth = locationTablePtr[actualCharacterCount + 1] - curLocation;
		} else {
			curStrikeWidth = locationTablePtr[curCharNr + 1] - curLocation;
		}

		// Figure out bytes + bits location
		curLocationBytes = curLocation >> 3;
		curLocationBits = curLocation & 0x0007;
		curCharWidth = curCharOffsetWidth & 0x00FF; // isolate width
		curCharOffset = curCharOffsetWidth >> 8; // isolate offset

		if (!curCharWidth) {
			fontData += 8; // skip over this character
			continue;
		}

		if (curCharWidth != 8) {
			if (curCharNr != 0x3B)
				error("AppleIIgs-font: expected 8x8 font");
		}

		// Get all rows of the current character
		strikeRowOffset = 0;
		for (curRow = 0; curRow < macRecord_RectHeight; curRow++) {
			strikeCurOffset = strikeRowOffset + curLocationBytes;

			// Copy over bits
			fontByte = 0;
			curByte = strikeDataPtr[strikeCurOffset];
			curBitMask = 0x80 >> curLocationBits;

			for (curPixelNr = 0; curPixelNr < curStrikeWidth; curPixelNr++) {
				fontByte = fontByte << 1;
				if (curByte & curBitMask) {
					fontByte |= 0x01;
				}
				curBitMask = curBitMask >> 1;
				if (!curBitMask) {
					curByte = strikeDataPtr[strikeCurOffset + 1];
					curBitMask = 0x80;
				}
			}

			// adjust, so that it's aligned to the left (starting at 0x80 bit)
			fontByte = fontByte << (8 - curStrikeWidth);

			// now adjust according to offset + MaxKern
			positionAdjust = macRecord_MaxKern + curCharOffset;

			// adjust may be negative for space, or 8 for "empty" characters
			if (positionAdjust > 8)
				error("AppleIIgs-font: invalid character spacing");

			if (positionAdjust < 0) {
				// negative adjust strangely happens for empty characters like space
				if (curStrikeWidth)
					error("AppleIIgs-font: invalid character spacing");
			}

			if (positionAdjust > 0) {
				// move the amount of pixels to the right
				fontByte = fontByte >> positionAdjust;
			}

			*fontData = fontByte;
			fontData++;

			strikeRowOffset += macRecord_StrikeWidth * 2;
		}
	}

	free(offsetWidthTablePtr);
	free(locationTablePtr);
	free(strikeDataPtr);

	// overwrite character 0x1A with the standard Sierra arrow to the right character
	// required for the original save/restore dialogs
	memcpy(_fontDataAllocated + (0x1A * 8), fontData_ArrowRightCharacter, sizeof(fontData_ArrowRightCharacter));
}

AgiEngine::AgiEngine(OSystem *syst, const AGIGameDescription *gameDesc) : AgiBase(syst, gameDesc) {

	// Setup mixer
	syncSoundSettings();

	DebugMan.addDebugChannel(kDebugLevelMain, "Main", "Generic debug level");
	DebugMan.addDebugChannel(kDebugLevelResources, "Resources", "Resources debugging");
	DebugMan.addDebugChannel(kDebugLevelSprites, "Sprites", "Sprites debugging");
	DebugMan.addDebugChannel(kDebugLevelInventory, "Inventory", "Inventory debugging");
	DebugMan.addDebugChannel(kDebugLevelInput, "Input", "Input events debugging");
	DebugMan.addDebugChannel(kDebugLevelMenu, "Menu", "Menu debugging");
	DebugMan.addDebugChannel(kDebugLevelScripts, "Scripts", "Scripts debugging");
	DebugMan.addDebugChannel(kDebugLevelSound, "Sound", "Sound debugging");
	DebugMan.addDebugChannel(kDebugLevelText, "Text", "Text output debugging");
	DebugMan.addDebugChannel(kDebugLevelSavegame, "Savegame", "Saving & restoring game debugging");


	memset(&_game, 0, sizeof(struct AgiGame));
	memset(&_debug, 0, sizeof(struct AgiDebug));
	memset(&_mouse, 0, sizeof(struct Mouse));

	_game.mouseEnabled = true;
	_game.mouseHidden = false;
	// don't check for Amiga, Amiga doesn't allow disabling mouse support. It's mandatory.
	if (!ConfMan.getBool("mousesupport")) {
		// we effectively disable the mouse for games, that explicitly do not want mouse support to be enabled
		_game.mouseEnabled = false;
		_game.mouseHidden = true;
	}

	_fontData = nullptr;
	_fontDataAllocated = nullptr;

	_game._vm = this;

	_game.gfxMode = true;

	_game.clockEnabled = false;
	_game.state = STATE_INIT;

	_keyQueueStart = 0;
	_keyQueueEnd = 0;

	_allowSynthetic = false;

	_intobj = NULL;

	memset(&_stringdata, 0, sizeof(struct StringData));

	_objects = NULL;

	_restartGame = false;

	_oldMode = INPUTMODE_NONE;

	_firstSlot = 0;

	resetControllers();

	setupOpcodes();
	_game._curLogic = NULL;
	_timerHack = 0;

	_lastSaveTime = 0;
	_lastTick = 0;

	memset(_keyQueue, 0, sizeof(_keyQueue));

	_text = NULL;
	_sprites = NULL;
	_picture = NULL;
	_loader = NULL;
	_console = NULL;
	_menu = NULL;
	_gfx = NULL;
	_systemUI = NULL;

	_egoHoldKey = false;
}

void AgiEngine::initialize() {
	// TODO: Some sound emulation modes do not fit our current music
	//       drivers, and I'm not sure what they are. For now, they might
	//       as well be called "PC Speaker" and "Not PC Speaker".

	// If used platform is Apple IIGS then we must use Apple IIGS sound emulation
	// because Apple IIGS AGI games use only Apple IIGS specific sound resources.
	if (getPlatform() == Common::kPlatformApple2GS) {
		_soundemu = SOUND_EMU_APPLE2GS;
	} else if (getPlatform() == Common::kPlatformCoCo3) {
		_soundemu = SOUND_EMU_COCO3;
	} else if (ConfMan.get("music_driver") == "auto") {
		// Default sound is the proper PCJr emulation
		_soundemu = SOUND_EMU_PCJR;
	} else {
		switch (MidiDriver::getMusicType(MidiDriver::detectDevice(MDT_PCSPK|MDT_AMIGA|MDT_ADLIB|MDT_PCJR|MDT_MIDI))) {
		case MT_PCSPK:
			_soundemu = SOUND_EMU_PC;
			break;
		case MT_ADLIB:
			_soundemu = SOUND_EMU_NONE;
			break;
		case MT_PCJR:
			_soundemu = SOUND_EMU_PCJR;
			break;
		case MT_AMIGA:
			_soundemu = SOUND_EMU_AMIGA;
			break;
		default:
			debug(0, "DEF");
			_soundemu = SOUND_EMU_MIDI;
			break;
		}
	}

	initRenderMode();
	initFont();

	_console = new Console(this);
	_words = new Words(this);
	_gfx = new GfxMgr(this);
	_sound = new SoundMgr(this, _mixer);
	_picture = new PictureMgr(this, _gfx);
	_sprites = new SpritesMgr(this, _gfx);
	_text = new TextMgr(this, _words, _gfx);
	_systemUI = new SystemUI(this, _gfx, _text);
	_inventory = new InventoryMgr(this, _gfx, _text, _systemUI);

	_text->init(_systemUI);

	_gfx->initMachine();

	_game.gameFlags = 0;

	_text->charAttrib_Set(15, 0);

	_game.name[0] = '\0';

	_gfx->initVideo();

	_lastSaveTime = 0;

	_lastTick = _system->getMillis();

	debugC(2, kDebugLevelMain, "Detect game");

	if (agiDetectGame() == errOK) {
		_game.state = STATE_LOADED;
		debugC(2, kDebugLevelMain, "game loaded");
	} else {
		warning("Could not open AGI game");
	}

	debugC(2, kDebugLevelMain, "Init sound");
}

bool AgiEngine::promptIsEnabled() {
	return _text->promptIsEnabled();
}

void AgiEngine::redrawScreen() {
	_game.gfxMode = true; // enable graphics mode
	_gfx->setPalette(true); // set graphics mode palette
	_text->charAttrib_Set(_text->_textAttrib.foreground, _text->_textAttrib.background);
	_gfx->clearDisplay(0);
	_picture->showPic();
	_text->statusDraw();
	_text->promptRedraw();
}

// Adjust a given coordinate to the local game screen
// Used on mouse cursor coordinates before passing them to scripts
void AgiEngine::adjustPosToGameScreen(int16 &x, int16 &y) {
	x = x / 2; // 320 -> 160
	y = y - _gfx->getRenderStartOffsetY(); // remove status bar line
	if (y < 0) {
		y = 0;
	}
	if (y >= SCRIPT_HEIGHT) {
		y = SCRIPT_HEIGHT + 1; // 1 beyond
	}
}

AgiEngine::~AgiEngine() {
	// If the engine hasn't been initialized yet via
	// AgiEngine::initialize(), don't attempt to free any resources, as
	// they haven't been allocated. Fixes bug #1742432 - AGI: Engine
	// crashes if no game is detected
	if (_game.state == STATE_INIT) {
		return;
	}

	agiDeinit();
	delete _loader;
	_gfx->deinitVideo();
	delete _inventory;
	delete _systemUI;
	delete _text;
	delete _sprites;
	delete _picture;
	_gfx->deinitMachine();
	delete _gfx;
	delete _words;
	delete _console;
}

Common::Error AgiBase::init() {

	// Initialize backend
	//initGraphics(320, 200, false);

	initialize();

	_gfx->setPalette(true);

	return Common::kNoError;
}

Common::Error AgiEngine::go() {
	if (_game.mouseEnabled) {
		CursorMan.showMouse(true);
	}
	setTotalPlayTime(0);

	if (_game.state < STATE_LOADED) {
		do {
			mainCycle();
		} while (_game.state < STATE_RUNNING);
	}

	runGame();

	return Common::kNoError;
}

// Scenes that need this:
//
// Manhunter 1:
//  - intro text screen (DrawPic)
//  - MAD "zooming in..." during intro and other scenes, for example room 124 (NewRoom)
//     The NewRoom call is not done during the same cycle as the "zooming in..." print call.
// Space Quest 1:
//  - right at the start of the game (NewRoom)
// Space Quest 2
//  - right at the start of the game (NewRoom)
//  - after exiting the very first room, a message pops up, that isn't readable without it (NewRoom)


// Games, that must not be triggered:
//
// Fanmade Voodoo Girl:
//  - waterfall (DrawPic, room 17)
//  - inside shop (NewRoom, changes to same room every new button, room 4)

void AgiEngine::nonBlockingText_IsShown() {
	_game.nonBlockingTextShown = true;
	_game.nonBlockingTextCyclesLeft = 2; // 1 additional script cycle is counted too
}
void AgiEngine::nonBlockingText_Forget() {
	_game.nonBlockingTextShown = false;
	_game.nonBlockingTextCyclesLeft = 0;
}
void AgiEngine::nonBlockingText_CycleDone() {
	if (_game.nonBlockingTextCyclesLeft) {
		_game.nonBlockingTextCyclesLeft--;

		if (!_game.nonBlockingTextCyclesLeft) {
			// cycle count expired, we assume that non-blocking text won't be a problem for room / pic change
			_game.nonBlockingTextShown = false;
		}
	}
}

void AgiEngine::loadingTrigger_NewRoom(int16 newRoomNr) {
	if (_game.nonBlockingTextShown) {
		_game.nonBlockingTextShown = false;

		int16 curRoomNr = _game.vars[VM_VAR_CURRENT_ROOM];

		if (newRoomNr != curRoomNr) {
			if (!_game.automaticRestoreGame) {
				// wait a bit, we detected non-blocking text
				pause(2000); // 2 seconds
			}
		}
	}
}

void AgiEngine::loadingTrigger_DrawPicture() {
	if (_game.nonBlockingTextShown) {
		_game.nonBlockingTextShown = false;

		if (!_game.automaticRestoreGame) {
			// wait a bit, we detected non-blocking text
			pause(2000); // 2 seconds
		}
	}
}

} // End of namespace Agi