/* 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/>.
 *
 *
 * This file is dual-licensed.
 * In addition to the GPLv3 license mentioned above, this code is also
 * licensed under LGPL 2.1. See LICENSES/COPYING.LGPL file for the
 * full text of the license.
 *
 */

#include "gob/gob.h"
#include "gob/save/saveload.h"
#include "gob/global.h"
#include "gob/video.h"
#include "gob/draw.h"

namespace Gob {

SaveLoad::SaveLoad(GobEngine *vm) : _vm(vm) {
}

SaveLoad::~SaveLoad() {
}

const char *SaveLoad::stripPath(const char *fileName, char separator) {
	const char *backSlash;
	if ((backSlash = strrchr(fileName, separator)))
		return backSlash + 1;

	return fileName;
}


Common::String SaveLoad::replacePathSeparators(const char *path, char newSeparator) {
	Common::String result = path;
	for (char &c : result) {
		if (c != newSeparator && (c == '\\' || c == '/' || c == ':'))
			c = newSeparator;
	}

	return result;
}

Common::List<Common::Path> SaveLoad::getFilesMatchingPattern(const Common::Path &pattern) const {
	warning("SaveLoad::getFilesMatchingPattern not implemented");
	return Common::List<Common::Path>();
}

int32 SaveLoad::getSize(const char *fileName) {
	debugC(3, kDebugSaveLoad, "Requested size of save file \"%s\"", fileName);

	SaveHandler *handler = getHandler(fileName);

	if (!handler) {
		warning("No save handler for \"%s\"", fileName);
		return -1;
	}

	int32 size = handler->getSize();

	debugC(4, kDebugSaveLoad, "Size is %d", size);

	return size;
}

bool SaveLoad::load(const char *fileName, int16 dataVar, int32 size, int32 offset) {
	debugC(3, kDebugSaveLoad, "Requested loading of save file \"%s\" - %d, %d, %d",
			fileName, dataVar, size, offset);

	SaveHandler *handler = getHandler(fileName);

	if (!handler) {
		warning("No save handler for \"%s\" (%d, %d, %d)", fileName, dataVar, size, offset);
		return false;
	}

	if (!handler->load(dataVar, size, offset)) {
		const char *desc = getDescription(fileName);

		if (!desc)
			desc = "Unknown";

		warning("Could not load %s (\"%s\" (%d, %d, %d))",
				desc, fileName, dataVar, size, offset);
		return false;
	}

	debugC(3, kDebugSaveLoad, "Successfully loaded game");
	return true;
}

bool SaveLoad::loadToRaw(const char *fileName, byte *ptr, int32 size, int32 offset) {
	debugC(3, kDebugSaveLoad, "Requested loading of save file \"%s\" - raw %p, %d, %d",
		   fileName, (void *)ptr, size, offset);

	SaveHandler *handler = getHandler(fileName);

	if (!handler) {
		warning("No save handler for \"%s\" (raw %p, %d, %d)", fileName, (void*) ptr, size, offset);
		return false;
	}

	if (!handler->loadToRaw(ptr, size, offset)) {
		const char *desc = getDescription(fileName);

		if (!desc)
			desc = "Unknown";

		warning("Could not load %s (\"%s\" (raw %p, %d, %d))",
				desc, fileName, (void*) ptr, size, offset);
		return false;
	}

	debugC(3, kDebugSaveLoad, "Successfully loaded game");
	return true;
}

bool SaveLoad::save(const char *fileName, int16 dataVar, int32 size, int32 offset) {
	debugC(3, kDebugSaveLoad, "Requested saving of save file \"%s\" - %d, %d, %d",
			fileName, dataVar, size, offset);

	SaveHandler *handler = getHandler(fileName);

	if (!handler) {
		warning("No save handler for \"%s\" (%d, %d, %d)", fileName, dataVar, size, offset);
		return false;
	}

	if (!handler->save(dataVar, size, offset)) {
		const char *desc = getDescription(fileName);

		if (!desc)
			desc = "Unknown";

		warning("Could not save %s (\"%s\" (%d, %d, %d))",
				desc, fileName, dataVar, size, offset);
		return false;
	}

	debugC(3, kDebugSaveLoad, "Successfully saved game");
	return true;
}

bool SaveLoad::saveFromRaw(const char *fileName, byte *ptr, int32 size, int32 offset) {
	debugC(3, kDebugSaveLoad, "Requested saving of save file \"%s\" - raw %p, %d, %d",
		   fileName, (void*) ptr, size, offset);

	SaveHandler *handler = getHandler(fileName);

	if (!handler) {
		warning("No save handler for \"%s\" (raw %p, %d, %d)", fileName, (void*) ptr, size, offset);
		return false;
	}

	if (!handler->saveFromRaw(ptr, size, offset)) {
		const char *desc = getDescription(fileName);

		if (!desc)
			desc = "Unknown";

		warning("Could not save %s (\"%s\" (raw %p, %d, %d))",
				desc, fileName, (void*) ptr, size, offset);
		return false;
	}

	debugC(3, kDebugSaveLoad, "Successfully saved game");
	return true;
}

bool SaveLoad::copySaveGame(const char *fileNameSrc, const char *fileNameDest) {
	SaveHandler *handlerSrc = getHandler(fileNameSrc);

	if (!handlerSrc) {
		warning("copySaveGame: no save handler for source \"%s\" ", fileNameSrc);
		return false;
	}

	SaveHandler *handlerDest = getHandler(fileNameDest);
	if (!handlerDest) {
		warning("copySaveGame: no save handler for destination \"%s\" ", fileNameDest);
		return false;
	}

	int32 size = handlerSrc->getSize();
	if (size == -1) {
		warning("copySaveGame: source file \"%s\" does not exists", fileNameSrc);
		return false;
	}

	byte *buffer = new byte[size];

	if (!handlerSrc->loadToRaw(buffer, size, 0)) {
		const char *desc = getDescription(fileNameSrc);

		if (!desc)
			desc = "Unknown";

		warning("Could not load %s (\"%s\") for copying to %s", desc, fileNameSrc, fileNameDest);
		delete[] buffer;
		return false;
	}

	if (!handlerDest->saveFromRaw(buffer, size, 0)) {
		const char *desc = getDescription(fileNameDest);

		if (!desc)
			desc = "Unknown";

		warning("Could not save %s (\"%s\") when copying from %s", desc, fileNameDest, fileNameSrc);
		delete[] buffer;
		return false;
	}

	debugC(3, kDebugSaveLoad, "Successfully copied saved game");
	delete[] buffer;
	return true;
}

bool SaveLoad::deleteFile(const char *fileName) {
	debugC(3, kDebugSaveLoad, "Requested deletion save file \"%s\"", fileName);

	SaveHandler *handler = getHandler(fileName);

	if (!handler) {
		warning("No save handler for \"%s\"", fileName);
		return false;
	}

	if (!handler->deleteFile()) {
		const char *desc = getDescription(fileName);

		if (!desc)
			desc = "Unknown";

		warning("Could not delete %s (\"%s\")", desc, fileName);
		return false;
	}

	debugC(3, kDebugSaveLoad, "Successfully deleted file");
	return true;
}

SaveLoad::SaveMode SaveLoad::getSaveMode(const char *fileName) const {
	return kSaveModeNone;
}

SaveHandler *SaveLoad::getHandler(const char *fileName) const {
	return nullptr;
}

const char *SaveLoad::getDescription(const char *fileName) const {
	return nullptr;
}

} // End of namespace Gob