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

static const PlainGameDescriptor dragonsGames[] = {
		{ "dragons", "Blazing Dragons" },
		{ 0, 0 }
};

namespace Dragons {

static const DragonsGameDescription gameDescriptions[] = {
	{
			{
					"dragons",
					0,
					AD_ENTRY1s("bigfile.dat", "02c26712bee57266f28235fdc0207725", 44990464),
					Common::EN_USA,
					Common::kPlatformPSX,
					ADGF_DROPPLATFORM,
					GUIO0()
			},
			kGameIdDragons
	},
	{
			{
					"dragons",
					0,
					AD_ENTRY1s("bigfile.dat", "02c26712bee57266f28235fdc0207725", 44992512),
					Common::EN_GRB,
					Common::kPlatformPSX,
					ADGF_DROPPLATFORM,
					GUIO0()
			},
			kGameIdDragons
	},
	{
			{
					"dragons",
					0,
					AD_ENTRY1s("bigfile.dat", "9854fed0d2b48522a62973e99b52a0be", 45099008),
					Common::DE_DEU,
					Common::kPlatformPSX,
					ADGF_DROPPLATFORM,
					GUIO0()
			},
			kGameIdDragons
	},
	{
			{
					"dragons",
					0,
					AD_ENTRY1s("bigfile.dat", "9854fed0d2b48522a62973e99b52a0be", 45107200),
					Common::FR_FRA,
					Common::kPlatformPSX,
					ADGF_DROPPLATFORM,
					GUIO0()
			},
			kGameIdDragons
	},

	{ AD_TABLE_END_MARKER, 0 }
};

} // End of namespace Dragons

static const char * const directoryGlobs[] = {
	"resource",
	0
};

class DragonsMetaEngine : public AdvancedMetaEngine {
public:
	DragonsMetaEngine() : AdvancedMetaEngine(Dragons::gameDescriptions, sizeof(Dragons::DragonsGameDescription), dragonsGames) {
		_maxScanDepth = 2;
		_directoryGlobs = directoryGlobs;
	}

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

	virtual const char *getName() const {
		return "Blazing Dragons";
	}

	virtual const char *getOriginalCopyright() const {
		return "(C) 1996 The Illusions Gaming Company";
	}

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

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

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

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

SaveStateList DragonsMetaEngine::listSaves(const char *target) const {
	Common::SaveFileManager *saveFileMan = g_system->getSavefileManager();
	Dragons::SaveHeader header;
	Common::String pattern = target;
	pattern += ".???";
	Common::StringArray filenames;
	filenames = saveFileMan->listSavefiles(pattern.c_str());
	SaveStateList saveList;
	for (Common::StringArray::const_iterator file = filenames.begin(); file != filenames.end(); ++file) {
		// Obtain the last 3 digits of the filename, since they correspond to the save slot
		int slotNum = atoi(file->c_str() + file->size() - 3);
		if (slotNum >= 0 && slotNum <= 999) {
			Common::InSaveFile *in = saveFileMan->openForLoading(file->c_str());
			if (in) {
				if (Dragons::DragonsEngine::readSaveHeader(in, header) == Dragons::kRSHENoError) {
					saveList.push_back(SaveStateDescriptor(slotNum, header.description));
				}
				delete in;
			}
		}
	}
	Common::sort(saveList.begin(), saveList.end(), SaveStateDescriptorSlotComparator());
	return saveList;
}

SaveStateDescriptor DragonsMetaEngine::querySaveMetaInfos(const char *target, int slot) const {
	Common::String filename = Dragons::DragonsEngine::getSavegameFilename(target, slot);
	Common::InSaveFile *in = g_system->getSavefileManager()->openForLoading(filename.c_str());
	if (in) {
		Dragons::SaveHeader header;
		Dragons::kReadSaveHeaderError error;
		error = Dragons::DragonsEngine::readSaveHeader(in, header, false);
		delete in;
		if (error == Dragons::kRSHENoError) {
			SaveStateDescriptor desc(slot, header.description);
			// Slot 0 is used for the "Continue" save
			desc.setDeletableFlag(slot != 0);
			desc.setWriteProtectedFlag(slot == 0);
			desc.setThumbnail(header.thumbnail);
			desc.setSaveDate(header.saveDate & 0xFFFF, (header.saveDate >> 16) & 0xFF, (header.saveDate >> 24) & 0xFF);
			desc.setSaveTime((header.saveTime >> 16) & 0xFF, (header.saveTime >> 8) & 0xFF);
			desc.setPlayTime(header.playTime * 1000);
			return desc;
		}
	}
	return SaveStateDescriptor();
}

bool DragonsMetaEngine::createInstance(OSystem *syst, Engine **engine, const ADGameDescription *desc) const {
	const Dragons::DragonsGameDescription *gd = (const Dragons::DragonsGameDescription *)desc;
	if (gd) {
		switch (gd->gameId) {
		case Dragons::kGameIdDragons:
			*engine = new Dragons::DragonsEngine(syst, desc);
			break;
		default:
			error("Unknown game id");
			break;
		}
	}
	return desc != 0;
}

#if PLUGIN_ENABLED_DYNAMIC(DRAGONS)
	REGISTER_PLUGIN_DYNAMIC(DRAGONS, PLUGIN_TYPE_ENGINE, DragonsMetaEngine);
#else
	REGISTER_PLUGIN_STATIC(DRAGONS, PLUGIN_TYPE_ENGINE, DragonsMetaEngine);
#endif