/* 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 "base/plugins.h"
#include "common/file.h"
#include "common/gui_options.h"
#include "common/savefile.h"
#include "common/translation.h"
#include "common/system.h"
#include "graphics/thumbnail.h"
#include "engines/advancedDetector.h"

#include "supernova/supernova.h"

#define GAMEOPTION_IMPROVED GUIO_GAMEOPTIONS1

static const ADExtraGuiOptionsMap optionsList[] = {
	{
		GAMEOPTION_IMPROVED,
		{
			_s("Improved mode"),
			_s("Removes some repetitive actions, adds possibility to change verbs by keyboard"),
			"improved",
			true
		}
	},

	AD_EXTRA_GUI_OPTIONS_TERMINATOR
};

static const PlainGameDescriptor supernovaGames[] = {
	{"msn1", "Mission Supernova 1"},
	{"msn2", "Mission Supernova 2"},
	{nullptr, nullptr}
};

namespace Supernova {
static const ADGameDescription gameDescriptions[] = {
	// Mission Supernova 1
	{
		"msn1",
		nullptr,
		AD_ENTRY1s("msn_data.000", "f64f16782a86211efa919fbae41e7568", 24163),
		Common::DE_DEU,
		Common::kPlatformDOS,
		ADGF_NO_FLAGS,
		GUIO2(GAMEOPTION_IMPROVED, GUIO_NOMIDI)
	},
	{
		"msn1",
		nullptr,
		AD_ENTRY1s("msn_data.000", "f64f16782a86211efa919fbae41e7568", 24163),
		Common::EN_ANY,
		Common::kPlatformDOS,
		ADGF_NO_FLAGS,
		GUIO2(GAMEOPTION_IMPROVED, GUIO_NOMIDI)
	},
	// Mission Supernova 2
	{
		"msn2",
		nullptr,
		AD_ENTRY1s("ms2_data.000", "e595610cba4a6d24a763e428d05cc83f", 24805),
		Common::DE_DEU,
		Common::kPlatformDOS,
		ADGF_NO_FLAGS,
		GUIO2(GAMEOPTION_IMPROVED, GUIO_NOMIDI)
	},
	{
		"msn2",
		nullptr,
		AD_ENTRY1s("ms2_data.000", "e595610cba4a6d24a763e428d05cc83f", 24805),
		Common::EN_ANY,
		Common::kPlatformDOS,
		ADGF_NO_FLAGS,
		GUIO2(GAMEOPTION_IMPROVED, GUIO_NOMIDI)
	},
	AD_TABLE_END_MARKER
};
}

class SupernovaMetaEngine: public AdvancedMetaEngine {
public:
	SupernovaMetaEngine() : AdvancedMetaEngine(Supernova::gameDescriptions, sizeof(ADGameDescription), supernovaGames, optionsList) {
	}

	const char *getEngineId() const {
		return "supernova";
	}

	virtual const char *getName() const {
		return "Mission Supernova";
	}

	virtual const char *getOriginalCopyright() const {
		return "Mission Supernova (C) 1994 Thomas and Steffen Dingel";
	}

	virtual bool hasFeature(MetaEngineFeature f) const;
	virtual bool createInstance(OSystem *syst, Engine **engine, const ADGameDescription *desc) const;
	virtual SaveStateList listSaves(const char *target) const;
	virtual void removeSaveState(const char *target, int slot) const;
	virtual int getMaximumSaveSlot() const {
		return 99;
	}
	virtual SaveStateDescriptor querySaveMetaInfos(const char *target, int slot) const;
};

bool SupernovaMetaEngine::hasFeature(MetaEngineFeature f) const {
	switch (f) {
	case kSupportsLoadingDuringStartup:
		// fallthrough
	case kSupportsListSaves:
		// fallthrough
	case kSupportsDeleteSave:
		// fallthrough
	case kSavesSupportMetaInfo:
		// fallthrough
	case kSavesSupportThumbnail:
		// fallthrough
	case kSavesSupportCreationDate:
		// fallthrough
	case kSavesSupportPlayTime:
		return true;
	default:
		return false;
	}
}

bool SupernovaMetaEngine::createInstance(OSystem *syst, Engine **engine, const ADGameDescription *desc) const {
	if (desc) {
		*engine = new Supernova::SupernovaEngine(syst);
	}

	return desc != nullptr;
}

SaveStateList SupernovaMetaEngine::listSaves(const char *target) const {
	Common::StringArray filenames;
	Common::String pattern;
	if (!strncmp(target, "msn1", 4))
		pattern = Common::String::format("msn_save.###");
	if (!strncmp(target, "msn2", 4))
		pattern = Common::String::format("ms2_save.###");

	filenames = g_system->getSavefileManager()->listSavefiles(pattern);

	SaveStateList saveFileList;
	for (Common::StringArray::const_iterator file = filenames.begin();
		 file != filenames.end(); ++file) {
		int saveSlot = atoi(file->c_str() + file->size() - 3);
		if (saveSlot >= 0 && saveSlot <= getMaximumSaveSlot()) {
			Common::InSaveFile *savefile = g_system->getSavefileManager()->openForLoading(*file);
			if (savefile) {
				uint saveHeader = savefile->readUint32LE();
				if ((saveHeader == SAVEGAME_HEADER && !strncmp(target, "msn1", 4)) ||
					(saveHeader == SAVEGAME_HEADER2 && !strncmp(target, "msn2", 4))) {
					byte saveVersion = savefile->readByte();
					if (saveVersion <= SAVEGAME_VERSION) {
						int saveFileDescSize = savefile->readSint16LE();
						char* saveFileDesc = new char[saveFileDescSize];
						savefile->read(saveFileDesc, saveFileDescSize);
						saveFileList.push_back(SaveStateDescriptor(saveSlot, saveFileDesc));
						delete [] saveFileDesc;
					}
				}
				delete savefile;
			}
		}
	}

	Common::sort(saveFileList.begin(), saveFileList.end(), SaveStateDescriptorSlotComparator());
	return saveFileList;
}

void SupernovaMetaEngine::removeSaveState(const char *target, int slot) const {
	Common::String filename;
	if (!strncmp(target, "msn1", 4))
		filename = Common::String::format("msn_save.%03d", slot);
	if (!strncmp(target, "msn2", 4))
		filename = Common::String::format("ms2_save.%03d", slot);
	g_system->getSavefileManager()->removeSavefile(filename);
}

SaveStateDescriptor SupernovaMetaEngine::querySaveMetaInfos(const char *target, int slot) const {
	Common::String fileName;
	if (!strncmp(target, "msn1", 4))
		fileName = Common::String::format("msn_save.%03d", slot);
	if (!strncmp(target, "msn2", 4))
		fileName = Common::String::format("ms2_save.%03d", slot);
	Common::InSaveFile *savefile = g_system->getSavefileManager()->openForLoading(fileName);

	if (savefile) {
		uint saveHeader = savefile->readUint32LE();
		if ((!strncmp(target, "msn1", 4) && saveHeader != SAVEGAME_HEADER) || 
			(!strncmp(target, "msn2", 4) && saveHeader != SAVEGAME_HEADER2)) {
			delete savefile;
			return SaveStateDescriptor();
		}
		byte saveVersion = savefile->readByte();
		if (saveVersion > SAVEGAME_VERSION){
			delete savefile;
			return SaveStateDescriptor();
		}

		int descriptionSize = savefile->readSint16LE();
		char* description = new char[descriptionSize];
		savefile->read(description, descriptionSize);
		SaveStateDescriptor desc(slot, description);
		delete [] description;

		uint32 saveDate = savefile->readUint32LE();
		int day = (saveDate >> 24) & 0xFF;
		int month = (saveDate >> 16) & 0xFF;
		int year = saveDate & 0xFFFF;
		desc.setSaveDate(year, month, day);

		uint16 saveTime = savefile->readUint16LE();
		int hour = (saveTime >> 8) & 0xFF;
		int minutes = saveTime & 0xFF;
		desc.setSaveTime(hour, minutes);

		uint32 playTime =savefile->readUint32LE();
		desc.setPlayTime(playTime * 1000);

		if (Graphics::checkThumbnailHeader(*savefile)) {
			Graphics::Surface *thumbnail;
			if (!Graphics::loadThumbnail(*savefile, thumbnail)) {
				delete savefile;
				return SaveStateDescriptor();
			}
			desc.setThumbnail(thumbnail);
		}

		delete savefile;

		return desc;
	}

	return SaveStateDescriptor();
}


#if PLUGIN_ENABLED_DYNAMIC(SUPERNOVA)
REGISTER_PLUGIN_DYNAMIC(SUPERNOVA, PLUGIN_TYPE_ENGINE, SupernovaMetaEngine);
#else
REGISTER_PLUGIN_STATIC(SUPERNOVA, PLUGIN_TYPE_ENGINE, SupernovaMetaEngine);
#endif