/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2006 Tatsuhiro Tsujikawa
 *
 * 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
 *
 * In addition, as a special exception, the copyright holders give
 * permission to link the code of portions of this program with the
 * OpenSSL library under certain conditions as described in each
 * individual source file, and distribute linked combinations
 * including the two.
 * You must obey the GNU General Public License in all respects
 * for all of the code used other than OpenSSL.  If you modify
 * file(s) with this exception, you may extend this exception to your
 * version of the file(s), but you are not obligated to do so.  If you
 * do not wish to do so, delete this exception statement from your
 * version.  If you delete this exception statement from all source
 * files in the program, then also delete it here.
 */
/* copyright --> */
#include "LogFactory.h"
#include "a2io.h"
#include "prefs.h"
#include "RecoverableException.h"

#ifdef HAVE_LIBGNUTLS
# include <gnutls/gnutls.h>
#endif // HAVE_LIBGNUTLS

namespace aria2 {

std::string LogFactory::filename_ = DEV_NULL;
std::shared_ptr<Logger> LogFactory::logger_;
bool LogFactory::consoleOutput_ = true;
Logger::LEVEL LogFactory::logLevel_ = Logger::A2_DEBUG;
Logger::LEVEL LogFactory::consoleLogLevel_ = Logger::A2_NOTICE;
bool LogFactory::colorOutput_ = true;

void LogFactory::openLogger(const std::shared_ptr<Logger>& logger)
{
  if(filename_ != DEV_NULL) {
    // don't open file DEV_NULL for performance sake.
    // This avoids costly unnecessary message formatting and write.
    logger->openFile(filename_);
  }
  logger->setLogLevel(logLevel_);
  logger->setConsoleLogLevel(consoleLogLevel_);
  logger->setConsoleOutput(consoleOutput_);
  logger->setColorOutput(colorOutput_);
}

void LogFactory::adjustDependentLevels() {
  auto level = consoleLogLevel_;
  if (filename_ != DEV_NULL) {
    level = std::min(level, logLevel_);
  }
#ifdef HAVE_LIBGNUTLS
  if (level == Logger::A2_DEBUG) {
    gnutls_global_set_log_level(6);
  }
  else {
    gnutls_global_set_log_level(0);
  }
#endif
}

void LogFactory::reconfigure()
{
  if(logger_) {
    logger_->closeFile();
    try {
      openLogger(logger_);
    } catch(RecoverableException& e) {
      logger_->closeFile();
      throw;
    }
  }
}

const std::shared_ptr<Logger>& LogFactory::getInstance()
{
  if(!logger_) {
    auto slogger = std::make_shared<Logger>();
    openLogger(slogger);
    logger_.swap(slogger);
  }
  return logger_;
}

void LogFactory::setLogFile(const std::string& name)
{
  if(name == "-") {
    filename_ = DEV_STDOUT;
  } else if(name == "") {
    filename_ = DEV_NULL;
  } else {
    filename_ = name;
  }
  adjustDependentLevels();
}

namespace {
Logger::LEVEL toLogLevel(const std::string& level)
{
  if(level == V_DEBUG) {
    return Logger::A2_DEBUG;
  } else if(level == V_INFO) {
    return Logger::A2_INFO;
  } else if(level == V_NOTICE) {
    return Logger::A2_NOTICE;
  } else if(level == V_WARN) {
    return Logger::A2_WARN;
  } else if(level == V_ERROR) {
    return Logger::A2_ERROR;
  } else {
    return Logger::A2_NOTICE;
  }
}
} // namespace

void LogFactory::setLogLevel(Logger::LEVEL level)
{
  logLevel_ = level;
  adjustDependentLevels();
}

void LogFactory::setLogLevel(const std::string& level)
{
  logLevel_ = toLogLevel(level);
  adjustDependentLevels();
}

void LogFactory::setConsoleLogLevel(Logger::LEVEL level)
{
  consoleLogLevel_ = level;
  adjustDependentLevels();
}

void LogFactory::setConsoleLogLevel(const std::string& level)
{
  consoleLogLevel_ = toLogLevel(level);
  adjustDependentLevels();
}

void LogFactory::setColorOutput(bool enabled)
{
  colorOutput_ = enabled;
}

void LogFactory::release() {
  logger_.reset();
}

} // namespace aria2
