/*
 * 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/rollingfileappender.h>
#include <log4cxx/helpers/loglog.h>
#include <log4cxx/helpers/optionconverter.h>
#include <log4cxx/helpers/stringhelper.h>

using namespace log4cxx;
using namespace log4cxx::helpers;

IMPLEMENT_LOG4CXX_OBJECT(RollingFileAppender)

RollingFileAppender::RollingFileAppender()
: maxFileSize(10*1024*1024), maxBackupIndex(1)
{
}


RollingFileAppender::RollingFileAppender(const LayoutPtr& layout, const String& fileName, bool append)
: FileAppender(layout, fileName, append),
maxFileSize(10*1024*1024), maxBackupIndex(1)
{
}

RollingFileAppender::RollingFileAppender(const LayoutPtr& layout, const String& 
fileName) : FileAppender(layout, fileName),
maxFileSize(10*1024*1024), maxBackupIndex(1)
{
}

RollingFileAppender::~RollingFileAppender()
{
	finalize();
}

// synchronization not necessary since doAppend is alreasy synched
void RollingFileAppender::rollOver()
{
	LOGLOG_DEBUG(_T("rolling over count=") << ofs.tellp());
	LOGLOG_DEBUG(_T("maxBackupIndex=") << maxBackupIndex);

	// close and reset the current file
	ofs.close();
	ofs.clear();

	// If maxBackups <= 0, then there is no file renaming to be done.
	if(maxBackupIndex > 0)
	{
		// Delete the oldest file, to keep Windows happy.
		StringBuffer file;
		file << fileName << _T(".") << maxBackupIndex;
		USES_CONVERSION;
		remove(T2A(file.str().c_str()));

		// Map {(maxBackupIndex - 1), ..., 2, 1} to {maxBackupIndex, ..., 3, 2}
		for (int i = maxBackupIndex - 1; i >= 1; i--)
		{
			StringBuffer file;
			StringBuffer target;

			file << fileName << _T(".") << i;
			target << fileName << _T(".") << (i + 1);
			LogLog::debug(_T("Renaming file ") + file.str() + _T(" to ") + target.str());
			std::string aFileName = T2A(file.str().c_str());
			std::string aTarget = T2A(target.str().c_str());
			rename(aFileName.c_str(), aTarget.c_str());
		}

		// Rename fileName to fileName.1
		StringBuffer target;
		target << fileName << _T(".") << 1;

		LogLog::debug(_T("Renaming file ") + fileName + _T(" to ") + target.str());
		std::string aFileName = T2A(fileName.c_str());
		std::string aTarget = T2A(target.str().c_str());
		rename(aFileName.c_str(), aTarget.c_str());
	}

	// Open the current file up again in truncation mode
	USES_CONVERSION;
	ofs.open(T2A(fileName.c_str()), std::ios::out|std::ios::trunc);
	if(!ofs.is_open())
	{
		LogLog::error(_T("Unable to open file: ") + fileName);
	}
}

void RollingFileAppender::subAppend(const spi::LoggingEventPtr& event)
{
	FileAppender::subAppend(event);
	if(!fileName.empty() && ofs.tellp() >= maxFileSize)
	{
		rollOver();
	}
}

void RollingFileAppender::setOption(const String& option,
	const String& value)
{
	if (StringHelper::equalsIgnoreCase(option, _T("maxfilesize")) 
		|| StringHelper::equalsIgnoreCase(option, _T("maximumfilesize")))
	{
		setMaxFileSize(value);
	}
	else if (StringHelper::equalsIgnoreCase(option, _T("maxbackupindex"))
		|| StringHelper::equalsIgnoreCase(option, _T("maximumbackupindex")))
	{
		maxBackupIndex = ttol(value.c_str());
	}
	else
	{
		FileAppender::setOption(option, value);
	}
}