/*
 * LogManager.h
 *
 * Copyright (C) 2008 Matthias Schiffer <matthias@gamezock.de>
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation, either version 3 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef MAD_CORE_LOGMANAGER_H_
#define MAD_CORE_LOGMANAGER_H_

#include "export.h"

#include "Configurable.h"
#include "Exception.h"
#include "Logger.h"
#include "String.h"

#include <queue>
#include <set>

#include <boost/thread/condition_variable.hpp>
#include <boost/thread/mutex.hpp>

namespace Mad {
namespace Core {

class Application;
class ThreadManager;

class MAD_CORE_EXPORT LogManager : public Configurable {
  private:
    friend class Application;
    friend class ThreadManager;

    typedef Logger::MessageCategory MessageCategory;
    typedef Logger::MessageLevel MessageLevel;

    struct Message {
      MessageCategory category;
      MessageLevel level;
      boost::posix_time::ptime timestamp;
      Core::String message;
      Core::String source;
    };

    class ConsoleLogger : public Logger {
      private:
        // For long messages, writing to cerr is not atomic
        // -> lock cerr to prevent messages mixing up
        boost::mutex cerrMutex;

      protected:
        virtual void logMessage(MessageCategory category, MessageLevel, boost::posix_time::ptime timestamp, const Core::String &message, const Core::String &source);

      public:
        ConsoleLogger() {}

        void logMessageDirect(MessageCategory category, MessageLevel level, boost::posix_time::ptime timestamp, const Core::String &message, const Core::String &source);
    };


    Application *application;

    boost::shared_ptr<ConsoleLogger> consoleLogger;

    std::set<boost::shared_ptr<Logger> > loggers;
    bool configured, running;

    boost::mutex queueMutex;
    boost::condition_variable queueCond;

    boost::mutex loggerMutex;

    std::queue<Message> messageQueue;

    void loggerThread();
    void stopLoggerThread() {
      boost::lock_guard<boost::mutex> lock(queueMutex);
      running = false;
      queueCond.notify_one();
    }

    LogManager(Application *application0);
    ~LogManager();

  protected:
    virtual void configure();

  public:
    static MessageLevel parseLevel(const String &str) throw (Exception);

    void log(MessageCategory category, MessageLevel level, boost::posix_time::ptime timestamp, const Core::String &message, const Core::String &source = Core::String());

    void registerLogger(boost::shared_ptr<Logger> logger) {
      boost::lock_guard<boost::mutex> lock(loggerMutex);
      loggers.insert(logger);
    }

    void unregisterLogger(boost::shared_ptr<Logger> logger) {
      boost::lock_guard<boost::mutex> lock(loggerMutex);
      loggers.erase(logger);
    }
};

}
}

#endif /* MAD_CORE_LOGMANAGER_H_ */