/* 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.
 *
 * $URL$
 * $Id$
 *
 */

#include "common/endian.h"
#include "common/savefile.h"
#include "common/system.h"

#include "kyra/kyra_v1.h"
#include "kyra/animator_v1.h"
#include "kyra/screen.h"
#include "kyra/resource.h"
#include "kyra/sound.h"
#include "kyra/timer.h"

#define CURRENT_VERSION 8

// TODO: our current savefiles still use the old
// flag system to check the version, we should
// change that some day, but for now it works
#define GF_FLOPPY (1 <<  0)
#define GF_TALKIE (1 <<  1)
#define GF_FMTOWNS (1 <<  2)

namespace Kyra {
void KyraEngine_v1::loadGame(const char *fileName) {
	debugC(9, kDebugLevelMain, "loadGame('%s')", fileName);
	Common::InSaveFile *in;

	if (!(in = _saveFileMan->openForLoading(fileName))) {
		warning("Can't open file '%s', game not loaded", fileName);
		return;
	}

	uint32 type = in->readUint32BE();

	// FIXME: The kyra savegame code used to be endian unsafe. Uncomment the
	// following line to graciously handle old savegames from LE machines.
	// if (type != MKID_BE('KYRA') && type != MKID_BE('ARYK')) {
	if (type != MKID_BE('KYRA')) {
		warning("No Kyrandia 1 savefile header");
		delete in;
		return;
	}
	uint32 version = in->readUint32BE();
	if (version > CURRENT_VERSION) {
		warning("Savegame is not the right version (%u)", version);
		delete in;
		return;
	}

	char saveName[31];
	in->read(saveName, 31);

	if (version >= 2) {
		uint32 flags = in->readUint32BE();
		if ((flags & GF_FLOPPY) && _flags.isTalkie) {
			warning("Can not load floppy savefile for this (non floppy) gameversion");
			delete in;
			return;
		} else if ((flags & GF_TALKIE) && !(_flags.isTalkie)) {
			warning("Can not load cdrom savefile for this (non cdrom) gameversion");
			delete in;
			return;
		} else if ((flags & GF_FMTOWNS) && !(_flags.platform == Common::kPlatformFMTowns || _flags.platform == Common::kPlatformPC98)) {
			warning("can not load FM-Towns/PC98 savefile for this (non FM-Towns/PC98) gameversion");
			delete in;
			return;
		}
	} else {
		warning("Make sure your savefile was from this version! (too old savefile version to detect that)");
	}

	snd_playSoundEffect(0x0A);
	snd_playWanderScoreViaMap(0, 1);

	// unload the current voice file should fix some problems with voices
	if (_currentRoom != 0xFFFF && _flags.isTalkie) {
		char file[32];
		assert(_currentRoom < _roomTableSize);
		int tableId = _roomTable[_currentRoom].nameIndex;
		assert(tableId < _roomFilenameTableSize);
		strcpy(file, _roomFilenameTable[tableId]);
		strcat(file, ".VRM");
		_res->unloadPakFile(file);
	}

	int brandonX = 0, brandonY = 0;
	for (int i = 0; i < 11; i++) {
		_characterList[i].sceneId = in->readUint16BE();
		_characterList[i].height = in->readByte();
		_characterList[i].facing = in->readByte();
		_characterList[i].currentAnimFrame = in->readUint16BE();
		//_characterList[i].unk6 = in->readUint32BE();
		in->read(_characterList[i].inventoryItems, 10);
		_characterList[i].x1 = in->readSint16BE();
		_characterList[i].y1 = in->readSint16BE();
		_characterList[i].x2 = in->readSint16BE();
		_characterList[i].y2 = in->readSint16BE();
		if (i == 0) {
			brandonX = _characterList[i].x1;
			brandonY = _characterList[i].y1;
		}
		//_characterList[i].field_20 = in->readUint16BE();
		//_characterList[i].field_23 = in->readUint16BE();
	}

	_marbleVaseItem = in->readSint16BE();
	_itemInHand = in->readByte();

	for (int i = 0; i < 4; ++i)
		_birthstoneGemTable[i] = in->readByte();
	for (int i = 0; i < 3; ++i)
		_idolGemsTable[i] = in->readByte();
	for (int i = 0; i < 3; ++i)
		_foyerItemTable[i] = in->readByte();
	_cauldronState = in->readByte();
	for (int i = 0; i < 2; ++i)
		_crystalState[i] = in->readByte();

	_brandonStatusBit = in->readUint16BE();
	_brandonStatusBit0x02Flag = in->readByte();
	_brandonStatusBit0x20Flag = in->readByte();
	in->read(_brandonPoisonFlagsGFX, 256);
	_brandonInvFlag = in->readSint16BE();
	_poisonDeathCounter = in->readByte();
	_animator->_brandonDrawFrame = in->readUint16BE();

	_timer->loadDataFromFile(in, version);

	memset(_flagsTable, 0, sizeof(_flagsTable));
	uint32 flagsSize = in->readUint32BE();
	assert(flagsSize <= sizeof(_flagsTable));
	in->read(_flagsTable, flagsSize);

	for (int i = 0; i < _roomTableSize; ++i) {
		for (int item = 0; item < 12; ++item) {
			_roomTable[i].itemsTable[item] = 0xFF;
			_roomTable[i].itemsXPos[item] = 0xFFFF;
			_roomTable[i].itemsYPos[item] = 0xFF;
			_roomTable[i].needInit[item] = 0;
		}
	}

	uint16 sceneId = 0;

	while (true) {
		sceneId = in->readUint16BE();
		if (sceneId == 0xFFFF)
			break;
		assert(sceneId < _roomTableSize);
		_roomTable[sceneId].nameIndex = in->readByte();

		for (int i = 0; i < 12; i++) {
			_roomTable[sceneId].itemsTable[i] = in->readByte();
			_roomTable[sceneId].itemsXPos[i] = in->readUint16BE();
			_roomTable[sceneId].itemsYPos[i] = in->readUint16BE();
			_roomTable[sceneId].needInit[i] = in->readByte();
		}
	}
	if (version >= 3) {
		_lastMusicCommand = in->readSint16BE();
		if (_lastMusicCommand != -1)
			snd_playWanderScoreViaMap(_lastMusicCommand, 1);
	}

	// Version 4 stored settings in the savegame. As of version 5, they are
	// handled by the config manager.

	if (version == 4) {
		in->readByte(); // Text speed
		in->readByte(); // Walk speed
		in->readByte(); // Music
		in->readByte(); // Sound
		in->readByte(); // Voice
	}

	if (version >= 7) {
		_curSfxFile = in->readByte();

		// In the first version when this entry was introduced,
		// it wasn't made sure that _curSfxFile was initialized
		// so if it's out of bounds we just set it to 0.
		if (_curSfxFile >= (int)_soundData_TOWNS->_fileListLen || _curSfxFile < 0)
			_curSfxFile = 0;

		if (_flags.platform == Common::kPlatformFMTowns || _flags.platform == Common::kPlatformPC98)
			_sound->loadSoundFile(_curSfxFile);
	}

	_screen->_disableScreen = true;
	loadMainScreen(8);

	if (queryGameFlag(0x2D)) {
		_screen->loadBitmap("AMULET3.CPS", 10, 10, 0);
		if (!queryGameFlag(0xF1)) {
			for (int i = 0x55; i <= 0x5A; ++i) {
				if (queryGameFlag(i))
					seq_createAmuletJewel(i-0x55, 10, 1, 1);
			}
		}
		_screen->copyRegion(0, 0, 0, 0, 320, 200, 10, 8);
		_screen->copyRegion(0, 0, 0, 0, 320, 200, 8, 0);
	}

	createMouseItem(_itemInHand);
	_animator->setBrandonAnimSeqSize(3, 48);
	redrawInventory(0);
	_animator->_noDrawShapesFlag = 1;
	enterNewScene(_currentCharacter->sceneId, _currentCharacter->facing, 0, 0, 1);
	_animator->_noDrawShapesFlag = 0;

	_currentCharacter->x1 = brandonX;
	_currentCharacter->y1 = brandonY;
	_animator->animRefreshNPC(0);
	_animator->restoreAllObjectBackgrounds();
	_animator->preserveAnyChangedBackgrounds();
	_animator->prepDrawAllObjects();
	_animator->copyChangedObjectsForward(0);
	_screen->copyRegion(8, 8, 8, 8, 304, 128, 2, 0);
	_screen->_disableScreen = false;
	_screen->updateScreen();

	_abortWalkFlag = true;
	_abortWalkFlag2 = false;
	_mousePressFlag = false;
	_system->warpMouse(brandonX, brandonY);

	if (in->ioFailed())
		error("Load failed.");
	else
		debugC(1, kDebugLevelMain, "Loaded savegame '%s.'", saveName);

	// We didn't explicitly set the walk speed, but it's saved as part of
	// the _timers array, so we need to re-sync it with _configWalkspeed.
	setWalkspeed(_configWalkspeed);

	delete in;
}

void KyraEngine_v1::saveGame(const char *fileName, const char *saveName) {
	debugC(9, kDebugLevelMain, "saveGame('%s', '%s')", fileName, saveName);
	Common::OutSaveFile *out;
	if (_quitFlag) return;

	if (!(out = _saveFileMan->openForSaving(fileName))) {
		warning("Can't create file '%s', game not saved", fileName);
		return;
	}

	// Savegame version
	out->writeUint32BE(MKID_BE('KYRA'));
	out->writeUint32BE(CURRENT_VERSION);
	out->write(saveName, 31);
	if (_flags.isTalkie)
		out->writeUint32BE(GF_TALKIE);
	else if (_flags.platform == Common::kPlatformFMTowns || _flags.platform == Common::kPlatformPC98)
		out->writeUint32BE(GF_FMTOWNS);
	else
		out->writeUint32BE(GF_FLOPPY);

	for (int i = 0; i < 11; i++) {
		out->writeUint16BE(_characterList[i].sceneId);
		out->writeByte(_characterList[i].height);
		out->writeByte(_characterList[i].facing);
		out->writeUint16BE(_characterList[i].currentAnimFrame);
		//out->writeUint32BE(_characterList[i].unk6);
		out->write(_characterList[i].inventoryItems, 10);
		out->writeSint16BE(_characterList[i].x1);
		out->writeSint16BE(_characterList[i].y1);
		out->writeSint16BE(_characterList[i].x2);
		out->writeSint16BE(_characterList[i].y2);
		//out->writeUint16BE(_characterList[i].field_20);
		//out->writeUint16BE(_characterList[i].field_23);
	}

	out->writeSint16BE(_marbleVaseItem);
	out->writeByte(_itemInHand);

	for (int i = 0; i < 4; ++i)
		out->writeByte(_birthstoneGemTable[i]);
	for (int i = 0; i < 3; ++i)
		out->writeByte(_idolGemsTable[i]);
	for (int i = 0; i < 3; ++i)
		out->writeByte(_foyerItemTable[i]);
	out->writeByte(_cauldronState);
	for (int i = 0; i < 2; ++i)
		out->writeByte(_crystalState[i]);

	out->writeUint16BE(_brandonStatusBit);
	out->writeByte(_brandonStatusBit0x02Flag);
	out->writeByte(_brandonStatusBit0x20Flag);
	out->write(_brandonPoisonFlagsGFX, 256);
	out->writeSint16BE(_brandonInvFlag);
	out->writeByte(_poisonDeathCounter);
	out->writeUint16BE(_animator->_brandonDrawFrame);

	_timer->saveDataToFile(out);

	out->writeUint32BE(sizeof(_flagsTable));
	out->write(_flagsTable, sizeof(_flagsTable));

	for (uint16 i = 0; i < _roomTableSize; i++) {
		out->writeUint16BE(i);
		out->writeByte(_roomTable[i].nameIndex);
		for (int a = 0; a < 12; a++) {
			out->writeByte(_roomTable[i].itemsTable[a]);
			out->writeUint16BE(_roomTable[i].itemsXPos[a]);
			out->writeUint16BE(_roomTable[i].itemsYPos[a]);
			out->writeByte(_roomTable[i].needInit[a]);
		}
	}
	// room table terminator
	out->writeUint16BE(0xFFFF);

	out->writeSint16BE(_lastMusicCommand);

	out->writeByte(_curSfxFile);

	out->finalize();

	// check for errors
	if (out->ioFailed())
		warning("Can't write file '%s'. (Disk full?)", fileName);
	else
		debugC(1, kDebugLevelMain, "Saved game '%s.'", saveName);

	delete out;
}
} // end of namespace Kyra