/*
 * Logger.h
 *
 * Copyright (C) 2008 Johannes Thorn <dante@g4t3.de>
 *
 * 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 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef MAD_COMMON_LOGGER_H_
#define MAD_COMMON_LOGGER_H_

#include <algorithm>
#include <cstdarg>
#include <list>
#include <string>
#include <bitset>

namespace Mad {
namespace Common {

class Logger {
  public:
    enum MessageLevel {
      CRITICAL, ERROR, WARNING, DEFAULT, VERBOSE, DEBUG
    };

    enum MessageCategory {
      SYSTEM, NETWORK, DAEMON, USER, DISK, PROGRAM, GENERAL
    };

  private:
    static std::list<Logger*> loggers;
    std::bitset<16> categories;
    MessageLevel level;

    static void logfv(MessageCategory category, MessageLevel level, const char *format, va_list ap);

  protected:
    Logger() : level(DEFAULT) {setAllCategories();}
    virtual void logMessage(MessageCategory category, MessageLevel level, const std::string &message) = 0;

  public:
    static void log(MessageCategory category, MessageLevel level, const std::string &message);
    static void log(MessageLevel level, const std::string &message) {
      log(GENERAL, level, message);
    }
    static void log(const std::string &message) {
      log(GENERAL, DEFAULT, message);
    }

    static void logf(MessageCategory category, MessageLevel level, const char *format, ...);
    static void logf(MessageLevel level, const char *format, ...);
    static void logf(const char *format, ...);

    static void registerLogger(Logger *logger) {
      loggers.push_back(logger);
    }

    static void unregisterLogger(Logger *logger) {
      std::list<Logger*>::iterator it = std::find(loggers.begin(), loggers.end(), logger);
      if(it != loggers.end())
        loggers.erase(it);
    }

    void setCategory(MessageCategory newCategory) {
      categories.set(newCategory);
    }

    void unsetCategory(MessageCategory oldCategory) {
      categories.reset(oldCategory);
    }

    void setAllCategories() {
      categories.set();
    }

    void unsetAllCategories() {
      categories.reset();
    }

    bool isCategorySet(MessageCategory category) {
      return categories.test(category);
    }

    MessageLevel getLevel() const {
      return level;
    }

    void setLevel(MessageLevel newLevel) {
      level = newLevel;
    }

    virtual ~Logger() {}
};

}
}

#endif /* MAD_COMMON_LOGGER_H_ */