/* 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 "engines/advancedDetector.h"

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

#include "graphics/thumbnail.h"

#include "adl/detection.h"
#include "adl/disk_image_helpers.h"

namespace Adl {

Common::String getDiskImageName(const AdlGameDescription &adlDesc, byte volume) {
	const ADGameDescription &desc = adlDesc.desc;
	for (uint i = 0; desc.filesDescriptions[i].fileName; ++i) {
		const ADGameFileDescription &fDesc = desc.filesDescriptions[i];

		if (fDesc.fileType == volume) {
			for (uint e = 0; e < ARRAYSIZE(diskImageExts); ++e) {
				if (diskImageExts[e].platform == desc.platform) {
					Common::String testFileName(fDesc.fileName);
					testFileName += diskImageExts[e].extension;
					if (Common::File::exists(testFileName))
						return testFileName;
				}
			}

			error("Failed to find disk image '%s'", fDesc.fileName);
		}
	}

	error("Disk volume %d not found", volume);
}

GameType getGameType(const AdlGameDescription &adlDesc) {
	return adlDesc.gameType;
}

GameVersion getGameVersion(const AdlGameDescription &adlDesc) {
	return adlDesc.version;
}

Common::Platform getPlatform(const AdlGameDescription &adlDesc) {
	return adlDesc.desc.platform;
}

class AdlMetaEngine : public AdvancedMetaEngine {
public:
    const char *getName() const override {
		return "adl";
	}

    bool hasFeature(MetaEngineFeature f) const override;
	SaveStateDescriptor querySaveMetaInfos(const char *target, int slot) const override;
	int getMaximumSaveSlot() const override { return 'O' - 'A'; }
	SaveStateList listSaves(const char *target) const override;
	void removeSaveState(const char *target, int slot) const override;

    bool createInstance(OSystem *syst, Engine **engine, const ADGameDescription *gd) const override;
};

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

SaveStateDescriptor AdlMetaEngine::querySaveMetaInfos(const char *target, int slot) const {
	Common::String fileName = Common::String::format("%s.s%02d", target, slot);
	Common::InSaveFile *inFile = g_system->getSavefileManager()->openForLoading(fileName);

	if (!inFile)
		return SaveStateDescriptor();

	if (inFile->readUint32BE() != MKTAG('A', 'D', 'L', ':')) {
		delete inFile;
		return SaveStateDescriptor();
	}

	byte saveVersion = inFile->readByte();
	if (saveVersion != SAVEGAME_VERSION) {
		delete inFile;
		return SaveStateDescriptor();
	}

	char name[SAVEGAME_NAME_LEN] = { };
	inFile->read(name, sizeof(name) - 1);
	inFile->readByte();

	if (inFile->eos() || inFile->err()) {
		delete inFile;
		return SaveStateDescriptor();
	}

	SaveStateDescriptor sd(slot, name);

	int year = inFile->readUint16BE();
	int month = inFile->readByte();
	int day = inFile->readByte();
	sd.setSaveDate(year + 1900, month + 1, day);

	int hour = inFile->readByte();
	int minutes = inFile->readByte();
	sd.setSaveTime(hour, minutes);

	uint32 playTime = inFile->readUint32BE();
	sd.setPlayTime(playTime);

	if (inFile->eos() || inFile->err()) {
		delete inFile;
		return SaveStateDescriptor();
	}

	Graphics::Surface *thumbnail;
	if (!Graphics::loadThumbnail(*inFile, thumbnail)) {
		delete inFile;
		return SaveStateDescriptor();
	}
	sd.setThumbnail(thumbnail);

	delete inFile;
	return sd;
}

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

	SaveStateList saveList;

	for (uint i = 0; i < files.size(); ++i) {
		const Common::String &fileName = files[i];
		Common::InSaveFile *inFile = saveFileMan->openForLoading(fileName);
		if (!inFile) {
			warning("Cannot open save file '%s'", fileName.c_str());
			continue;
		}

		if (inFile->readUint32BE() != MKTAG('A', 'D', 'L', ':')) {
			warning("No header found in '%s'", fileName.c_str());
			delete inFile;
			continue;
		}

		byte saveVersion = inFile->readByte();
		if (saveVersion != SAVEGAME_VERSION) {
			warning("Unsupported save game version %i found in '%s'", saveVersion, fileName.c_str());
			delete inFile;
			continue;
		}

		char name[SAVEGAME_NAME_LEN] = { };
		inFile->read(name, sizeof(name) - 1);
		delete inFile;

		int slotNum = atoi(fileName.c_str() + fileName.size() - 2);
		SaveStateDescriptor sd(slotNum, name);
		saveList.push_back(sd);
	}

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

void AdlMetaEngine::removeSaveState(const char *target, int slot) const {
	Common::String fileName = Common::String::format("%s.s%02d", target, slot);
	g_system->getSavefileManager()->removeSavefile(fileName);
}

Engine *HiRes1Engine_create(OSystem *syst, const AdlGameDescription *gd);
Engine *HiRes2Engine_create(OSystem *syst, const AdlGameDescription *gd);
Engine *HiRes0Engine_create(OSystem *syst, const AdlGameDescription *gd);
Engine *HiRes3Engine_create(OSystem *syst, const AdlGameDescription *gd);
Engine *HiRes4Engine_create(OSystem *syst, const AdlGameDescription *gd);
Engine *HiRes5Engine_create(OSystem *syst, const AdlGameDescription *gd);
Engine *HiRes6Engine_create(OSystem *syst, const AdlGameDescription *gd);

bool AdlMetaEngine::createInstance(OSystem *syst, Engine **engine, const ADGameDescription *gd) const {
	if (!gd)
		return false;

	const AdlGameDescription *adlGd = (const AdlGameDescription *)gd;

	switch (adlGd->gameType) {
	case GAME_TYPE_HIRES1:
		*engine = HiRes1Engine_create(syst, adlGd);
		break;
	case GAME_TYPE_HIRES2:
		*engine = HiRes2Engine_create(syst, adlGd);
		break;
	case GAME_TYPE_HIRES0:
		*engine = HiRes0Engine_create(syst, adlGd);
		break;
	case GAME_TYPE_HIRES3:
		*engine = HiRes3Engine_create(syst, adlGd);
		break;
	case GAME_TYPE_HIRES4:
		*engine = HiRes4Engine_create(syst, adlGd);
		break;
	case GAME_TYPE_HIRES5:
		*engine = HiRes5Engine_create(syst, adlGd);
		break;
	case GAME_TYPE_HIRES6:
		*engine = HiRes6Engine_create(syst, adlGd);
		break;
	default:
		error("Unknown GameType");
	}

	return true;
}

} // End of namespace Adl

#if PLUGIN_ENABLED_DYNAMIC(ADL)
	REGISTER_PLUGIN_DYNAMIC(ADL, PLUGIN_TYPE_ENGINE, Adl::AdlMetaEngine);
#else
	REGISTER_PLUGIN_STATIC(ADL, PLUGIN_TYPE_ENGINE, Adl::AdlMetaEngine);
#endif