/*
 * Copyright 2003,2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#include <log4cxx/logmanager.h>
#include <log4cxx/spi/defaultrepositoryselector.h>
#include <log4cxx/hierarchy.h>
#include <log4cxx/spi/rootcategory.h>
#include <log4cxx/spi/loggerfactory.h>
#include <stdexcept>
#include <log4cxx/level.h>
#include <log4cxx/spi/loggerrepository.h>
#include <log4cxx/helpers/exception.h>
#include <log4cxx/helpers/optionconverter.h>
#include <log4cxx/helpers/loglog.h>
#include <sys/stat.h>

#define DEFAULT_CONFIGURATION_FILE _T("log4j.properties")
#define DEFAULT_XML_CONFIGURATION_FILE _T("log4j.xml")
#define DEFAULT_CONFIGURATION_KEY _T("log4j.configuration")
#define CONFIGURATOR_CLASS_KEY _T("log4j.configuratorClass")

using namespace log4cxx;
using namespace log4cxx::spi;
using namespace log4cxx::helpers;

IMPLEMENT_LOG4CXX_OBJECT(DefaultRepositorySelector)

void * LogManager::guard = 0;
RepositorySelectorPtr LogManager::repositorySelector;

void LogManager::setRepositorySelector(spi::RepositorySelectorPtr selector,
	void * guard)
{
	if((LogManager::guard != 0) && (LogManager::guard != guard))
	{
		throw IllegalArgumentException(
		_T("Attempted to reset the LoggerFactory without possessing the guard."));
	}

	if(selector == 0)
	{
		throw IllegalArgumentException(
		_T("RepositorySelector must be non-null."));
	}

	LogManager::guard = guard;
	LogManager::repositorySelector = selector;
}

LoggerRepositoryPtr& LogManager::getLoggerRepository()
{
	if (repositorySelector == 0)
	{
		repositorySelector =
			new DefaultRepositorySelector(
				new Hierarchy(
					new RootCategory(Level::DEBUG)));
		
		// Use automatic configration to configure the default hierarchy
		String configuratorClassName =
			OptionConverter::getSystemProperty(CONFIGURATOR_CLASS_KEY,_T(""));
		String configurationOptionStr =
			OptionConverter::getSystemProperty(DEFAULT_CONFIGURATION_KEY,_T(""));
		
		struct stat buff;
		USES_CONVERSION;
		
		if (configurationOptionStr.empty())
		{
			configurationOptionStr = DEFAULT_XML_CONFIGURATION_FILE;
			if (stat(T2A(configurationOptionStr.c_str()), &buff) == -1)
			{
				configurationOptionStr = DEFAULT_CONFIGURATION_FILE;
			}
		}
		
		if (stat(T2A(configurationOptionStr.c_str()), &buff) == 0)
		{
			LogLog::debug(
				_T("Using configuration file [") +configurationOptionStr 
				+ _T("] for automatic log4cxx configuration"));
			
			OptionConverter::selectAndConfigure(
				configurationOptionStr, 
				configuratorClassName,
				repositorySelector->getLoggerRepository()); 
		}
		else
		{
			LogLog::debug(
				_T("Could not find configuration file: [")
				+configurationOptionStr+_T("]."));
		}
	}

	return repositorySelector->getLoggerRepository();
}

LoggerPtr LogManager::getRootLogger()
{
	// Delegate the actual manufacturing of the logger to the logger repository.
	return getLoggerRepository()->getRootLogger();
}

/**
Retrieve the appropriate Logger instance.
*/
LoggerPtr LogManager::getLogger(const String& name)
{
	// Delegate the actual manufacturing of the logger to the logger repository.
	return getLoggerRepository()->getLogger(name);
}

/**
Retrieve the appropriate Logger instance.
*/
LoggerPtr LogManager::getLogger(const String& name,
								spi::LoggerFactoryPtr factory)
{
	// Delegate the actual manufacturing of the logger to the logger repository.
	return getLoggerRepository()->getLogger(name, factory);
}

LoggerPtr LogManager::exists(const String& name)
{
	return getLoggerRepository()->exists(name);
}

LoggerList LogManager::getCurrentLoggers()
{
	return getLoggerRepository()->getCurrentLoggers();
}

void LogManager::shutdown()
{
	getLoggerRepository()->shutdown();
}

void LogManager::resetConfiguration()
{
	getLoggerRepository()->resetConfiguration();
}