/******************************************************************************
 *
 * package:     Log4Qt
 * file:        fileappender.cpp
 * created:     September 2007
 * author:      Martin Heinrich
 *
 * 
 * Copyright 2007 Martin Heinrich
 * 
 * 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.
 * 
 ******************************************************************************/



/******************************************************************************
 * Dependencies
 ******************************************************************************/


#include "log4qt/fileappender.h"

#include <QtCore/QDir>
#include <QtCore/QFile>
#include <QtCore/QFileInfo>
#include <QtCore/QDebug>
#include <QtCore/QTextStream>
#include <QtCore/QTextCodec>
#include "log4qt/layout.h"
#include "log4qt/loggingevent.h"



namespace Log4Qt
{
	    
	
	/**************************************************************************
	 * Declarations
	 **************************************************************************/
	
	
	
	/**************************************************************************
	 * C helper functions
	 **************************************************************************/
	
	
	
	/**************************************************************************
	 * Class implementation: FileAppender
	 **************************************************************************/
	
	
	FileAppender::FileAppender(QObject *pParent) :
	    WriterAppender(pParent),
	    mAppendFile(false),
	    mBufferedIo(true),
	    mFileName(),
	    mpFile(0),
	    mpTextStream(0)
	{
	}
	
	
	FileAppender::FileAppender(Layout *pLayout,
	                           const QString &rFileName,
	                           QObject *pParent) :
	    WriterAppender(pLayout, pParent),
	    mAppendFile(false),
	    mBufferedIo(true),
	    mFileName(rFileName),
	    mpFile(0),
	    mpTextStream(0)
	{
	}
	
	
	FileAppender::FileAppender(Layout *pLayout,
	                           const QString &rFileName,
	                           bool append,
	                           QObject *pParent) :
	    WriterAppender(pLayout, pParent),
	    mAppendFile(append),
	    mBufferedIo(true),
	    mFileName(rFileName),
	    mpFile(0),
	    mpTextStream(0)
	{
	}
	
	                        	   
	FileAppender::FileAppender(Layout *pLayout,
	                           const QString &rFileName,
	                           bool append,
	                           bool buffered,
	                           QObject *pParent) :
	    WriterAppender(pLayout, pParent),
	    mAppendFile(append),
	    mBufferedIo(buffered),
	    mFileName(rFileName),
	    mpFile(0),
	    mpTextStream(0)
	{
	}
	
	
	FileAppender::~FileAppender()
	{
	    close();
	}
	
	
	void FileAppender::activateOptions()
	{
	    QMutexLocker locker(&mObjectGuard);
	
        if (mFileName.isEmpty())
        {
            LogError e = LOG4QT_QCLASS_ERROR(QT_TR_NOOP("Activation of Appender '%1' that requires file and has no file set"),
                                             APPENDER_ACTIVATE_MISSING_FILE_ERROR);
            e << name();
            logger()->error(e);
            return;
        }
	    closeFile();
	    openFile();
	    WriterAppender::activateOptions();
	}
	
	
	void FileAppender::close()
	{
	    QMutexLocker locker(&mObjectGuard);
	
	    if (isClosed())
	        return;
	
	    WriterAppender::close();
	    closeFile();
	}
	
	
	bool FileAppender::checkEntryConditions() const
	{    
	    // Q_ASSERT_X(, "FileAppender::checkEntryConditions()", "Lock must be held by caller")
	
	    if (!mpFile || !mpTextStream)
	    {
	        LogError e = LOG4QT_QCLASS_ERROR(QT_TR_NOOP("Use of appender '%1' without open file"),
                                             APPENDER_NO_OPEN_FILE_ERROR);
	        e << name();
	        logger()->error(e);
	        return false;
	    }
	    
	    return WriterAppender::checkEntryConditions();
	}
	
	
	void FileAppender::closeFile()
	{
	    // Q_ASSERT_X(, "FileAppender::closeFile()", "Lock must be held by caller")
	
	    if (mpFile)
	        logger()->debug("Closing file '%1' for appender '%2'", mpFile->fileName(), name());
	    
	    setWriter(0);
	    delete mpTextStream;
	    mpTextStream = 0;
	    delete mpFile;
	    mpFile = 0;
	}
	
	
#ifndef QT_NO_DEBUG_STREAM
	QDebug FileAppender::debug(QDebug &rDebug) const
	{
	    QString layout_name;
	    if (layout())
	        layout_name = layout()->name();
	    QString codec_name;
	    if (encoding())
	        codec_name = QLatin1String(encoding()->name());
	    
	    rDebug.nospace() << "FileAppender(" 
	        << "name:" << name() << " "
	        << "appendfile:" << appendFile() << " " 
	        << "bufferedio:" << bufferedIo() << " "
	        << "encoding:" << codec_name << " "
	        << "file:" << file() << " "
	        << "filter:" << firstFilter() << " "
	        << "immediateflush:" << immediateFlush() << " "
	        << "isactive:" << isActive() << " "
	        << "isclosed:" << isClosed() << " "
	        << "layout:" << layout_name << " "
	        << "referencecount:" << referenceCount() << " "
	        << "threshold:" << threshold().toString() << " "
	        << "writer:" << writer()
	        << ")";
	    return rDebug.space();    
	}
#endif // QT_NO_DEBUG_STREAM
	
	
    bool FileAppender::handleIoErrors() const
	{
	    // Q_ASSERT_X(, "FileAppender::handleIoErrors()", "Lock must be held by caller")
	
	    if (mpFile->error() == QFile::NoError)
	        return false;
	    
	    LogError e = LOG4QT_QCLASS_ERROR(QT_TR_NOOP("Unable to write to file '%1' for appender '%2'"),
                                         APPENDER_WRITING_FILE_ERROR);
	    e << mFileName << name();
	    e.addCausingError(LogError(mpFile->errorString(), mpFile->error()));
	    logger()->error(e);
	    return true;
	}
	
    
	void FileAppender::openFile()
	{
	    Q_ASSERT_X(mpFile == 0 && mpTextStream == 0, "FileAppender::openFile()", "Opening file without closing previous file");
	    
	    QFileInfo file_info(mFileName);
	    QDir parent_dir = file_info.dir();
	    if (!parent_dir.exists())
	    {
	        logger()->trace("Creating missing parent directory for file %1", mFileName);
	        QString name = parent_dir.dirName();
	        parent_dir.cdUp();
	        parent_dir.mkdir(name);
	    }

	    
	    mpFile = new QFile(mFileName);
	    QFile::OpenMode mode = QIODevice::WriteOnly | QIODevice::Text;
	    if (mAppendFile)
	        mode |= QIODevice::Append;
	    else
	        mode |= QIODevice::Truncate;
	    if (!mBufferedIo)
	        mode |= QIODevice::Unbuffered;
	    if (!mpFile->open(mode))
	    {
	        LogError e = LOG4QT_QCLASS_ERROR(QT_TR_NOOP("Unable to open file '%1' for appender '%2'"),
                                             APPENDER_OPENING_FILE_ERROR);
	        e << mFileName << name();
	        e.addCausingError(LogError(mpFile->errorString(), mpFile->error()));
	        logger()->error(e);
	        return;
	    }
	    mpTextStream = new QTextStream(mpFile);
	    setWriter(mpTextStream);
	    logger()->debug("Opened file '%1' for appender '%2'", mpFile->fileName(), name());
	}
    

    bool FileAppender::removeFile(QFile &rFile) const
	{
        if (rFile.remove())
        	return true;
        
    	LogError e = LOG4QT_QCLASS_ERROR(QT_TR_NOOP("Unable to remove file '%1' for appender '%2'"),
                                         APPENDER_REMOVE_FILE_ERROR);
        e << rFile.fileName() << name();
        e.addCausingError(LogError(rFile.errorString(), rFile.error()));
        logger()->error(e);
        return false;
    }
	
	
    bool FileAppender::renameFile(QFile &rFile,
                                  const QString &rFileName) const
	{
        logger()->debug("Renaming file '%1' to '%2'", rFile.fileName(), rFileName);
        if (rFile.rename(rFileName))
        	return true;
        
        LogError e = LOG4QT_QCLASS_ERROR(QT_TR_NOOP("Unable to rename file '%1' to '%2' for appender '%3'"),
                                         APPENDER_RENAMING_FILE_ERROR);
        e << rFile.fileName() << rFileName << name();
        e.addCausingError(LogError(rFile.errorString(), rFile.error()));
        logger()->error(e);
        return false;
    }
    

    
    /**************************************************************************
	 * Implementation: Operators, Helper
	 **************************************************************************/
	
	
} // namespace Log4Qt