/* 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 "common/system.h"
#include "common/savefile.h"
#include "common/algorithm.h"

#include "base/plugins.h"

#include "engines/advancedDetector.h"
#include "teenagent/resources.h"
#include "teenagent/teenagent.h"
#include "graphics/thumbnail.h"

static const PlainGameDescriptor teenAgentGames[] = {
	{ "teenagent", "Teen Agent" },
	{ 0, 0 }
};

static const ADGameDescription teenAgentGameDescriptions[] = {
	{
		"teenagent",
		"",
		{
			{"off.res", 0, NULL, -1},
			{"on.res", 0, NULL, -1},
			{"ons.res", 0, NULL, -1},
			{"varia.res", 0, NULL, -1},
			{"lan_000.res", 0, NULL, -1},
			{"lan_500.res", 0, NULL, -1},
			{"mmm.res", 0, NULL, -1},
			{"sam_mmm.res", 0, NULL, -1},
			{"sam_sam.res", 0, NULL, -1},
			//{"unlogic.res", 0, NULL, -1}, //skipped if not present
			{NULL, 0, NULL, 0}
		},
		Common::EN_ANY,
		Common::kPlatformDOS,
		ADGF_NO_FLAGS,
		GUIO1(GUIO_NOSPEECH)
	},
	{
		"teenagent",
		"",
		{
			{"off.res", 0, NULL, -1},
			{"on.res", 0, NULL, -1},
			{"ons.res", 0, NULL, -1},
			{"varia.res", 0, NULL, -1},
			{"lan_000.res", 0, NULL, -1},
			{"lan_500.res", 0, NULL, -1},
			{"sam_sam.res", 0, NULL, -1},
			{"voices.res", 0, NULL, -1},
			{"cdlogo.res", 0, NULL, -1},
			{NULL, 0, NULL, 0}
		},
		Common::CZ_CZE,
		Common::kPlatformDOS,
		ADGF_CD,
		GUIO0()
	},
	AD_TABLE_END_MARKER,
};

enum {
	MAX_SAVES = 20
};

class TeenAgentMetaEngine : public AdvancedMetaEngine {
public:
	TeenAgentMetaEngine() : AdvancedMetaEngine(teenAgentGameDescriptions, sizeof(ADGameDescription), teenAgentGames) {
		_singleId = "teenagent";
	}

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

	virtual const char *getOriginalCopyright() const {
		return "TEENAGENT (C) 1994 Metropolis";
	}

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

	virtual bool createInstance(OSystem *syst, Engine **engine, const ADGameDescription *desc) const {
		if (desc) {
			*engine = new TeenAgent::TeenAgentEngine(syst, desc);
		}
		return desc != 0;
	}

	static Common::String generateGameStateFileName(const char *target, int slot) {
		return Common::String::format("%s.%02d", target, slot);
	}

	virtual SaveStateList listSaves(const char *target) const {
		Common::String pattern = target;
		pattern += ".##";

		Common::StringArray filenames = g_system->getSavefileManager()->listSavefiles(pattern);

		SaveStateList saveList;
		for (Common::StringArray::const_iterator file = filenames.begin(); file != filenames.end(); ++file) {
			int slot = atoi(file->c_str() + file->size() - 2);
			if (slot >= 0 && slot < MAX_SAVES) {
				Common::ScopedPtr<Common::InSaveFile> in(g_system->getSavefileManager()->openForLoading(*file));
				if (!in)
					continue;

				char buf[25];
				in->seek(0);
				in->read(buf, 24);
				buf[24] = 0;
				saveList.push_back(SaveStateDescriptor(slot, buf));
			}
		}
		// Sort saves based on slot number.
		Common::sort(saveList.begin(), saveList.end(), SaveStateDescriptorSlotComparator());
		return saveList;
	}

	virtual int getMaximumSaveSlot() const {
		return MAX_SAVES - 1;
	}

	virtual void removeSaveState(const char *target, int slot) const {
		Common::String filename = generateGameStateFileName(target, slot);
		g_system->getSavefileManager()->removeSavefile(filename);
	}

	virtual SaveStateDescriptor querySaveMetaInfos(const char *target, int slot) const {
		Common::String filename = generateGameStateFileName(target, slot);
		Common::ScopedPtr<Common::InSaveFile> in(g_system->getSavefileManager()->openForLoading(filename));
		if (!in)
			return SaveStateDescriptor();

		char buf[25];
		in->seek(0);
		in->read(buf, 24);
		buf[24] = 0;

		Common::String desc = buf;

		in->seek(TeenAgent::saveStateSize);
		if (!Graphics::checkThumbnailHeader(*in))
			return SaveStateDescriptor(slot, desc);

		SaveStateDescriptor ssd(slot, desc);

		//checking for the thumbnail
		Graphics::Surface *thumbnail;
		if (!Graphics::loadThumbnail(*in, thumbnail)) {
			return SaveStateDescriptor();
		}
		ssd.setThumbnail(thumbnail);

		return ssd;
	}
};

#if PLUGIN_ENABLED_DYNAMIC(TEENAGENT)
	REGISTER_PLUGIN_DYNAMIC(TEENAGENT, PLUGIN_TYPE_ENGINE, TeenAgentMetaEngine);
#else
	REGISTER_PLUGIN_STATIC(TEENAGENT, PLUGIN_TYPE_ENGINE, TeenAgentMetaEngine);
#endif
