/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */

/*

 * Copyright (c) 2006,2007 INRIA

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation;

 *

 * 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

 *

 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>

 */

#ifdef NS3_LOG_ENABLE

#include <list>

#include <utility>

#include <iostream>

#include "log.h"

#include "assert.h"

#include "ns3/core-config.h"

#include "fatal-error.h"

#ifdef HAVE_STDLIB_H

#include <stdlib.h>

#endif

namespace ns3 {

typedef std::list<std::pair <std::string, LogComponent *> > ComponentList;

typedef std::list<std::pair <std::string, LogComponent *> >::iterator ComponentListI;

static 

ComponentList *GetComponentList (void)

{

  static ComponentList components;

  return &components;

}

void

LogComponentEnableEnvVar (void)

{

  static bool isFirstLog = true;

  if (!isFirstLog)

    {

      return;

    }

#ifdef HAVE_GETENV

  char *envVar = getenv("NS_LOG");

  if (envVar == 0)

    {

      isFirstLog = false;

      return;

    }

  std::string env = envVar;

  if (env == "print-list")

    {

      LogComponentPrintList ();

      isFirstLog = false;

      return;

    }

  bool allFound = true;

  std::string::size_type cur = 0;

  std::string::size_type next = 0;

  while (true)

    {

      next = env.find_first_of (";", cur);

      std::string tmp = std::string (env, cur, next);

      {

        /* The following code is a workaround for a bug in the g++

         * c++ string library. Its goal is to remove any trailing ';'

         * from the string even though there should not be any in

         * it. This code should be safe even if the bug is not there.

         */

        std::string::size_type trailing = tmp.find_first_of (";");

        tmp = tmp.substr (0, trailing);

      }

      if (tmp.size () == 0)

        {

          break;

        }

      std::string::size_type equal = tmp.find ("=");

      std::string component;

      if (equal == std::string::npos)

        {

          component = tmp;

          level = LOG_DEBUG;

        }

      else

        {

          component = tmp.substr (0, equal);

          std::string::size_type cur_lev;

          std::string::size_type next_lev = equal;

          do

            {

              cur_lev = next_lev + 1;

              next_lev = tmp.find ("|", cur_lev);

              std::string lev = tmp.substr (cur_lev, next_lev - cur_lev);

              if (lev == "error")

                {

                  level |= LOG_ERROR;

                }

              else if (lev == "warn")

                {

                  level |= LOG_WARN;

                }

              else if (lev == "debug")

                {

                  level |= LOG_DEBUG;

                }

              else if (lev == "info")

                {

                  level |= LOG_INFO;

                }

              else if (lev == "function")

                {

                  level |= LOG_FUNCTION;

                }

              else if (lev == "param")

                {

                  level |= LOG_PARAM;

                }

              else if (lev == "logic")

                {

                  level |= LOG_LOGIC;

                }

              else if (lev == "all")

                {

                  level |= LOG_ALL;

                }

                {

                  level |= LOG_LEVEL_ERROR;

                }

                {

                  level |= LOG_LEVEL_WARN;

                }

                {

                  level |= LOG_LEVEL_DEBUG;

                }

                {

                  level |= LOG_LEVEL_INFO;

                }

                {

                  level |= LOG_LEVEL_FUNCTION;

                }

                {

                  level |= LOG_LEVEL_PARAM;

                }

                {

                  level |= LOG_LEVEL_LOGIC;

                }

                {

                  level |= LOG_LEVEL_ALL;

                }

            } while (next_lev != std::string::npos);

        }

      bool found = false;

        {

            {

            }

        }

      if (!found)

        {

          allFound = false;

        }

      if (next == std::string::npos)

        {

          break;

        }

      cur = next + 1;

      if (cur >= env.size ()) 

        {

          break;

        }

    }

  if (allFound)

    {

      isFirstLog = false;

    }

#endif

}

LogComponent::LogComponent (char const * name)

  : m_levels (0), m_name (name)

{

  ComponentList *components = GetComponentList ();

  for (ComponentListI i = components->begin ();

       i != components->end ();

       i++)

    {

      NS_ASSERT (i->first != name);

    }

  components->push_back (std::make_pair (name, this));

}

bool 

LogComponent::IsEnabled (enum LogLevel level) const

{

  LogComponentEnableEnvVar ();

  return (level & m_levels) ? 1 : 0;

}

bool

LogComponent::IsNoneEnabled (void) const

{

  return m_levels == 0;

}

void 

LogComponent::Enable (enum LogLevel level)

{

  m_levels |= level;

}

void 

LogComponent::Disable (enum LogLevel level)

{

  m_levels &= ~level;

}

char const *

LogComponent::Name (void) const

{

  return m_name;

}

void 

LogComponentEnable (char const *name, enum LogLevel level)

{

  ComponentList *components = GetComponentList ();

  for (ComponentListI i = components->begin ();

       i != components->end ();

       i++)

    {

      if (i->first.compare (name) == 0) 

	{

	  i->second->Enable (level);

	  break;

	}

    }  

}

void 

LogComponentEnableAll (enum LogLevel level)

{

  ComponentList *components = GetComponentList ();

  for (ComponentListI i = components->begin ();

       i != components->end ();

       i++)

    {

      i->second->Enable (level);

    }  

}

void 

LogComponentDisable (char const *name, enum LogLevel level)

{

  ComponentList *components = GetComponentList ();

  for (ComponentListI i = components->begin ();

       i != components->end ();

       i++)

    {

      if (i->first.compare (name) == 0) 

	{

	  i->second->Disable (level);

	  break;

	}

    }  

}

void 

LogComponentDisableAll (enum LogLevel level)

{

  ComponentList *components = GetComponentList ();

  for (ComponentListI i = components->begin ();

       i != components->end ();

       i++)

    {

      i->second->Disable (level);

    }  

}

void 

LogComponentPrintList (void)

{

  ComponentList *components = GetComponentList ();

  for (ComponentListI i = components->begin ();

       i != components->end ();

       i++)

    {

      std::cout << i->first << "=";

      if (i->second->IsNoneEnabled ())

        {

          std::cout << "0" << std::endl;

          continue;

        }

      if (i->second->IsEnabled (LOG_ERROR))

        {

          std::cout << "error";

        }

      if (i->second->IsEnabled (LOG_WARN))

        {

          std::cout << "|warn";

        }

      if (i->second->IsEnabled (LOG_DEBUG))

        {

          std::cout << "|debug";

        }

      if (i->second->IsEnabled (LOG_INFO))

        {

          std::cout << "|info";

        }

      if (i->second->IsEnabled (LOG_FUNCTION))

        {

          std::cout << "|function";

        }

      if (i->second->IsEnabled (LOG_PARAM))

        {

          std::cout << "|param";

        }

      if (i->second->IsEnabled (LOG_LOGIC))

        {

          std::cout << "|logic";

        }

      if (i->second->IsEnabled (LOG_ALL))

        {

          std::cout << "|all";

        }

      std::cout << std::endl;

    }

}

} // namespace ns3

#endif // NS3_LOG_ENABLE