/* 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 "bladerunner/bladerunner.h"
#include "bladerunner/detection_tables.h"
#include "bladerunner/savefile.h"

#include "common/config-manager.h"
#include "common/system.h"
#include "common/savefile.h"
#include "common/serializer.h"

#include "engines/advancedDetector.h"

namespace BladeRunner {

static const PlainGameDescriptor bladeRunnerGames[] = {
	{"bladerunner", "Blade Runner"},
	{0, 0}
};

} // End of namespace BladeRunner

class BladeRunnerMetaEngine : public AdvancedMetaEngine {
public:
	BladeRunnerMetaEngine();

	const char *getName() const override;
	const char *getOriginalCopyright() const override;
	bool createInstance(OSystem *syst, Engine **engine, const ADGameDescription *desc) const override;
	bool hasFeature(MetaEngineFeature f) const override;
	SaveStateList listSaves(const char *target) const override;
	int getMaximumSaveSlot() const override;
	void removeSaveState(const char *target, int slot) const override;
	SaveStateDescriptor querySaveMetaInfos(const char *target, int slot) const override;
};

BladeRunnerMetaEngine::BladeRunnerMetaEngine()
	: AdvancedMetaEngine(
		BladeRunner::gameDescriptions,
		sizeof(BladeRunner::gameDescriptions[0]),
		BladeRunner::bladeRunnerGames) {}


const char *BladeRunnerMetaEngine::getName() const {
	return "Blade Runner Engine";
}

const char *BladeRunnerMetaEngine::getOriginalCopyright() const {
	return "Blade Runner (C) 1997 Westwood Studios";
}

bool BladeRunnerMetaEngine::createInstance(OSystem *syst, Engine **engine, const ADGameDescription *desc) const {
	*engine = new BladeRunner::BladeRunnerEngine(syst, desc);

	return true;
}

bool BladeRunnerMetaEngine::hasFeature(MetaEngineFeature f) const {
	return
		f == kSupportsListSaves ||
		f == kSupportsLoadingDuringStartup ||
		f == kSupportsDeleteSave ||
		f == kSavesSupportMetaInfo ||
		f == kSavesSupportThumbnail ||
		f == kSimpleSavesNames;
}

SaveStateList BladeRunnerMetaEngine::listSaves(const char *target) const {
	Common::SaveFileManager *saveFileMan = g_system->getSavefileManager();
	Common::StringArray files = saveFileMan->listSavefiles(Common::String::format("%s.###", target));

	SaveStateList saveList;
	for (Common::StringArray::const_iterator fileName = files.begin(); fileName != files.end(); ++fileName) {
		Common::InSaveFile *saveFile = saveFileMan->openForLoading(*fileName);
		if (saveFile == nullptr || saveFile->err()) {
			warning("Cannot open save file '%s'", fileName->c_str());
			continue;
		}

		BladeRunner::SaveFileHeader header;
		BladeRunner::SaveFile::readHeader(*saveFile, header);

		int slotNum = atoi(fileName->c_str() + fileName->size() - 3);
		saveList.push_back(SaveStateDescriptor(slotNum, header._name));
	}

	// Sort saves based on slot number.
	Common::sort(saveList.begin(), saveList.end(), SaveStateDescriptorSlotComparator());
	return saveList;
}

int BladeRunnerMetaEngine::getMaximumSaveSlot() const {
	return 999;
}

void BladeRunnerMetaEngine::removeSaveState(const char *target, int slot) const {
	Common::String filename = Common::String::format("%s.%03d", target, slot);
	g_system->getSavefileManager()->removeSavefile(filename);
}

SaveStateDescriptor BladeRunnerMetaEngine::querySaveMetaInfos(const char *target, int slot) const {
	Common::String filename = Common::String::format("%s.%03d", target, slot);
	Common::InSaveFile *saveFile = g_system->getSavefileManager()->openForLoading(filename);

	if (saveFile == nullptr || saveFile->err()) {
		return SaveStateDescriptor();
	}

	BladeRunner::SaveFileHeader header;
	if (!BladeRunner::SaveFile::readHeader(*saveFile, header, false)) {
		delete saveFile;
		return SaveStateDescriptor();
	}
	delete saveFile;

	SaveStateDescriptor desc(slot, header._name);
	desc.setThumbnail(header._thumbnail);
	desc.setSaveDate(header._year, header._month, header._day);
	desc.setSaveTime(header._hour, header._minute);
	return desc;
}

#if PLUGIN_ENABLED_DYNAMIC(BLADERUNNER)
	REGISTER_PLUGIN_DYNAMIC(BLADERUNNER, PLUGIN_TYPE_ENGINE, BladeRunnerMetaEngine);
#else
	REGISTER_PLUGIN_STATIC(BLADERUNNER, PLUGIN_TYPE_ENGINE, BladeRunnerMetaEngine);
#endif