/*
 * Copyright (c) 2010 Remko Tronçon
 * Licensed under the GNU General Public License v3.
 * See Documentation/Licenses/GPLv3.txt for more information.
 */

#include <Swiften/Avatars/AvatarFileStorage.h>

#include <iostream>
#include <boost/filesystem/fstream.hpp>
#include <boost/filesystem.hpp>

#include <Swiften/Base/foreach.h>
#include <Swiften/Base/String.h>
#include <Swiften/StringCodecs/SHA1.h>
#include <Swiften/StringCodecs/Hexify.h>

namespace Swift {

AvatarFileStorage::AvatarFileStorage(const boost::filesystem::path& avatarsDir, const boost::filesystem::path& avatarsFile) : avatarsDir(avatarsDir), avatarsFile(avatarsFile) {
	if (boost::filesystem::exists(avatarsFile)) {
		try {
			boost::filesystem::ifstream file(avatarsFile);
			std::string line;
			if (file.is_open()) {
				while (!file.eof()) {
					getline(file, line);
					std::pair<std::string, std::string> r = String::getSplittedAtFirst(line, ' ');
					JID jid(r.second);
					if (jid.isValid()) {
						jidAvatars.insert(std::make_pair(jid, r.first));
					}
					else if (!r.first.empty() || !r.second.empty()) {
						std::cerr << "Invalid entry in avatars file: " << r.second << std::endl;
					}
				}
			}
		}
		catch (...) {
			std::cerr << "Error reading avatars file" << std::endl;
		}
	}
}

bool AvatarFileStorage::hasAvatar(const std::string& hash) const { 
	return boost::filesystem::exists(getAvatarPath(hash));
}

void AvatarFileStorage::addAvatar(const std::string& hash, const ByteArray& avatar) {
	assert(Hexify::hexify(SHA1::getHash(avatar)) == hash);

	boost::filesystem::path avatarPath = getAvatarPath(hash);
	if (!boost::filesystem::exists(avatarPath.parent_path())) {
		try {
			boost::filesystem::create_directories(avatarPath.parent_path());
		}
		catch (const boost::filesystem::filesystem_error& e) {
			std::cerr << "ERROR: " << e.what() << std::endl;
		}
	}
	boost::filesystem::ofstream file(avatarPath, boost::filesystem::ofstream::binary|boost::filesystem::ofstream::out);
	file.write(reinterpret_cast<const char*>(avatar.getData()), static_cast<std::streamsize>(avatar.getSize()));
	file.close();
}

boost::filesystem::path AvatarFileStorage::getAvatarPath(const std::string& hash) const {
	return avatarsDir / hash;
}

ByteArray AvatarFileStorage::getAvatar(const std::string& hash) const {
	ByteArray data;
	data.readFromFile(getAvatarPath(hash).string());
	return data;
}

void AvatarFileStorage::setAvatarForJID(const JID& jid, const std::string& hash) {
	std::pair<JIDAvatarMap::iterator, bool> r = jidAvatars.insert(std::make_pair(jid, hash));
	if (r.second) {
		saveJIDAvatars();
	}
	else if (r.first->second != hash) {
		r.first->second = hash;
		saveJIDAvatars();
	}
}

std::string AvatarFileStorage::getAvatarForJID(const JID& jid) const {
	JIDAvatarMap::const_iterator i = jidAvatars.find(jid);
	return i == jidAvatars.end() ? "" : i->second;
}

void AvatarFileStorage::saveJIDAvatars() {
	try {
		boost::filesystem::ofstream file(avatarsFile);
		for (JIDAvatarMap::const_iterator i = jidAvatars.begin(); i != jidAvatars.end(); ++i) {
			file << i->second << " " << i->first.toString() << std::endl;
		}
		file.close();
	}
	catch (...) {
		std::cerr << "Error writing avatars file" << std::endl;
	}
}

}