/*
 * Copyright (C) 2001-2008 Jacek Sieka, arnetheduck on gmail point com
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#if !defined(LOG_MANAGER_H)
#define LOG_MANAGER_H

#include "File.h"
#include "CriticalSection.h"
#include "Singleton.h"
#include "TimerManager.h"

namespace dcpp {

class LogManagerListener {
public:
	virtual ~LogManagerListener() { }
	template<int I>	struct X { enum { TYPE = I }; };

	typedef X<0> Message;
	virtual void on(Message, time_t, const string&) throw() { }
};

class LogManager : public Singleton<LogManager>, public Speaker<LogManagerListener>
{
public:
	enum LogArea { CHAT, PM, DOWNLOAD, UPLOAD, SYSTEM, STATUS, LAST };
	enum {FILE, FORMAT};

	void log(LogArea area, StringMap& params) throw() {
		string path = SETTING(LOG_DIRECTORY);
		string msg;

		path += Util::formatParams(getSetting(area, FILE), params, true);
		msg = Util::formatParams(getSetting(area, FORMAT), params, false);

		log(path, msg);
	}

	deque<pair<time_t, string> > getLastLogs() { Lock l(cs); return lastLogs; }

	void message(const string& msg) {
		if(BOOLSETTING(LOG_SYSTEM)) {
			StringMap params;
			params["message"] = msg;
			log(LogManager::SYSTEM, params);
		}
		time_t t = GET_TIME();
		{
			Lock l(cs);
			// Keep the last 100 messages (completely arbitrary number...)
			while(lastLogs.size() > 100)
				lastLogs.pop_front();
			lastLogs.push_back(make_pair(t, msg));
		}
		fire(LogManagerListener::Message(), t, msg);
	}

	const string& getSetting(int area, int sel) {
		return SettingsManager::getInstance()->get(static_cast<SettingsManager::StrSetting>(logOptions[area][sel]), true);
	}

	void saveSetting(int area, int sel, const string& setting) {
		SettingsManager::getInstance()->set(static_cast<SettingsManager::StrSetting>(logOptions[area][sel]), setting);
	}

private:
	void log(const string& area, const string& msg) throw() {
		Lock l(cs);
		try {
			string aArea = Util::validateFileName(area);
			File::ensureDirectory(aArea);
			File f(aArea, File::WRITE, File::OPEN | File::CREATE);
			f.setEndPos(0);
			f.write(msg + "\r\n");
		} catch (const FileException&) {
			// ...
		}
	}

	friend class Singleton<LogManager>;
	CriticalSection cs;
	deque<pair<time_t, string> > lastLogs;

	int logOptions[LAST][2];

	LogManager() {
		logOptions[UPLOAD][FILE]		= SettingsManager::LOG_FILE_UPLOAD;
		logOptions[UPLOAD][FORMAT]		= SettingsManager::LOG_FORMAT_POST_UPLOAD;
		logOptions[DOWNLOAD][FILE]		= SettingsManager::LOG_FILE_DOWNLOAD;
		logOptions[DOWNLOAD][FORMAT]	= SettingsManager::LOG_FORMAT_POST_DOWNLOAD;
		logOptions[CHAT][FILE]			= SettingsManager::LOG_FILE_MAIN_CHAT;
		logOptions[CHAT][FORMAT]		= SettingsManager::LOG_FORMAT_MAIN_CHAT;
		logOptions[PM][FILE]			= SettingsManager::LOG_FILE_PRIVATE_CHAT;
		logOptions[PM][FORMAT]			= SettingsManager::LOG_FORMAT_PRIVATE_CHAT;
		logOptions[SYSTEM][FILE]		= SettingsManager::LOG_FILE_SYSTEM;
		logOptions[SYSTEM][FORMAT]		= SettingsManager::LOG_FORMAT_SYSTEM;
		logOptions[STATUS][FILE]		= SettingsManager::LOG_FILE_STATUS;
		logOptions[STATUS][FORMAT]		= SettingsManager::LOG_FORMAT_STATUS;
	}
	virtual ~LogManager() throw() { }

};

#define LOG(area, msg) LogManager::getInstance()->log(area, msg)

} // namespace dcpp

#endif // !defined(LOG_MANAGER_H)