/* 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 "gargoyle/frotz/detection.h"
#include "common/file.h"
#include "common/md5.h"

#include "gargoyle/frotz/detection_tables.h"

namespace Gargoyle {
namespace Frotz {

bool FrotzMetaEngine::detectGames(const Common::FSList &fslist, DetectedGames &gameList) {
	const char *const EXTENSIONS[9] = { ".z1", ".z2", ".z3", ".z4", ".z5", ".z6", ".z7", ".z8", ".zblorb" };

	// Loop through the files of the folder
	for (Common::FSList::const_iterator file = fslist.begin(); file != fslist.end(); ++file) {
		// Check for a recognised filename
		if (file->isDirectory())
			continue;
		Common::String filename = file->getName();
		bool hasExt = false;
		for (int idx = 0; idx < 9 && !hasExt; ++idx)
			hasExt = filename.hasSuffixIgnoreCase(EXTENSIONS[idx]);
		if (!hasExt)
			continue;

		// Open up the file and calculate the md5
		Common::File gameFile;
		if (!gameFile.open(*file))
			continue;
		Common::String md5 = Common::computeStreamMD5AsString(gameFile, 5000);
		size_t filesize = gameFile.size();
		gameFile.close();

		// Check for known game
		const FrotzGameDescription *p = FROTZ_GAMES;
		while (p->_gameId && p->_md5 && (md5 != p->_md5 || filesize != p->_filesize))
			++p;

		DetectedGame gd;
		if (!p->_gameId) {
			// Generic .dat files don't get reported as matches unless they have a known md5
			if (filename.hasSuffixIgnoreCase(".dat"))
				continue;

			warning("Uknown zcode game %s - %s %d", filename.c_str(), md5.c_str(), filesize);
			gd = DetectedGame("zcode", "Unrecognised zcode game", Common::UNK_LANG, Common::kPlatformUnknown);
		} else {
			gd = DetectedGame(p->_gameId, p->_description, p->_language, Common::kPlatformUnknown, p->_extra);
		}

		gd.addExtraEntry("filename", filename);
		gameList.push_back(gd);
	}

	return !gameList.empty();
}

} // End of namespace Frotz
} // End of namespace Gargoyle