/***************************************************************************
 *   Copyright (C) 2013 by Volker Krause <vkrause@kde.org>                 *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU Library 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 Library 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.         *
 ***************************************************************************/

#include "session.h"

#include <shared/akstandarddirs.h>
#include <shared/akdebug.h>

#include <QCoreApplication>
#include <QDebug>
#include <QFile>
#include <QSocketNotifier>
#include <QSettings>
#include <QLocalSocket>

#include <iostream>
#include <fcntl.h>
#include <unistd.h>

Session::Session( const QString &input, QObject *parent )
  : QObject( parent )
  , m_input( 0 )
  , m_session( 0 )
  , m_notifier( 0 )
  , m_receivedBytes( 0 )
  , m_sentBytes( 0 )
{
  QFile *file = new QFile( this );
  if ( input != QLatin1String( "-" ) ) {
    file->setFileName( input );
    if ( !file->open( QFile::ReadOnly ) ) {
      akFatal() << "Failed to open" << input;
    }
  } else {
    // ### does that work on Windows?
    const int flags = fcntl( 0, F_GETFL );
    fcntl( 0, F_SETFL, flags | O_NONBLOCK );

    if ( !file->open( stdin, QFile::ReadOnly|QFile::Unbuffered ) ) {
      akFatal() << "Failed to open stdin!";
    }
    m_notifier = new QSocketNotifier( 0, QSocketNotifier::Read, this );
    connect( m_notifier, SIGNAL(activated(int)), SLOT(inputAvailable()) );
  }
  m_input = file;
}

Session::~Session()
{
}

void Session::connectToHost()
{
  const QSettings connectionSettings( AkStandardDirs::connectionConfigFile(), QSettings::IniFormat );

  QString serverAddress;
#ifdef Q_OS_WIN
  serverAddress = connectionSettings.value( QLatin1String( "Data/NamedPipe" ), QString() ).toString();
#else
  serverAddress = connectionSettings.value( QLatin1String( "Data/UnixPath" ), QString() ).toString();
#endif
  if ( serverAddress.isEmpty() ) {
    akFatal() << "Unable to determine server address.";
  }

  QLocalSocket *socket = new QLocalSocket( this );
  connect( socket, SIGNAL(error(QLocalSocket::LocalSocketError)), SLOT(serverError(QLocalSocket::LocalSocketError)) );
  connect( socket, SIGNAL(disconnected()), SLOT(serverDisconnected()) );
  connect( socket, SIGNAL(readyRead()), SLOT(serverRead()) );
  connect( socket, SIGNAL(connected()), SLOT(inputAvailable()) );

  m_session = socket;
  socket->connectToServer( serverAddress );

  m_connectionTime.start();
}

void Session::inputAvailable()
{
  if ( !m_session->isOpen() ) {
    return;
  }

  if ( m_notifier ) {
    m_notifier->setEnabled( false );
  }

  if ( m_input->atEnd() ) {
    return;
  }

  QByteArray buffer( 1024, Qt::Uninitialized );
  qint64 readSize = 0;

  while ( ( readSize = m_input->read( buffer.data(), buffer.size() ) ) > 0 ) {
    m_session->write( buffer.constData(), readSize );
    m_sentBytes += readSize;
  }

  if ( m_notifier ) {
    m_notifier->setEnabled( true );
  }
}

void Session::serverDisconnected()
{
  QCoreApplication::exit( 0 );
}

void Session::serverError( QLocalSocket::LocalSocketError socketError )
{
  if ( socketError == QLocalSocket::PeerClosedError ) {
    QCoreApplication::exit( 0 );
    return;
  }

  std::cerr << qPrintable( m_session->errorString() );
  QCoreApplication::exit( 1 );
}

void Session::serverRead()
{
  QByteArray buffer( 1024, Qt::Uninitialized );
  qint64 readSize = 0;

  while ( ( readSize = m_session->read( buffer.data(), buffer.size() ) ) > 0 ) {
    write( 1, buffer.data(), readSize );
    m_receivedBytes += readSize;
  }
}

void Session::printStats() const
{
  std::cerr << "Connection time: " << m_connectionTime.elapsed() << " ms" << std::endl;
  std::cerr << "Sent: " << m_sentBytes << " bytes" << std::endl;
  std::cerr << "Received: " << m_receivedBytes << " bytes" << std::endl;
}