/* This file is (c) 2008-2012 Konstantin Isakov <ikm@goldendict.org>
 * Part of GoldenDict. Licensed under GPLv3 or later, see the LICENSE file */

#include <QDir>
#include <QTimer>
#include "externalviewer.hh"
#include "parsecmdline.hh"
#include "gddebug.hh"

ExternalViewer::ExternalViewer( const char * data, int size,
                                QString const & extension, QString const & viewerCmdLine_,
                                QObject * parent)
    :
  QObject( parent ),
  tempFile( QDir::temp().filePath( QString( "gd-XXXXXXXX." ) + extension ) ),
  viewer( this ),
  viewerCmdLine( viewerCmdLine_ )
{
  if ( !tempFile.open() || tempFile.write( data, size ) != size )
    throw exCantCreateTempFile();

  tempFileName = tempFile.fileName(); // For some reason it loses it after it was closed()

#ifdef Q_OS_WIN32
  // Issue #239
  tempFileName = QDir::toNativeSeparators(tempFileName);
#endif

  tempFile.close();

  GD_DPRINTF( "%s\n", tempFile.fileName().toLocal8Bit().data() );
}

void ExternalViewer::start() 
{
  connect( &viewer, SIGNAL( finished( int, QProcess::ExitStatus ) ),
           this, SLOT( deleteLater() ) );
  connect( &viewer, SIGNAL( error( QProcess::ProcessError ) ),
           this, SLOT( deleteLater() ) );

  QStringList args = parseCommandLine( viewerCmdLine );

  if ( !args.isEmpty() )
  {
    QString program = args.first();
    args.pop_front();
    args.push_back( tempFileName );
    viewer.start( program, args, QIODevice::NotOpen );
    if ( !viewer.waitForStarted() )
      throw exCantRunViewer( viewerCmdLine.toUtf8().data() );
  }
  else
    throw exCantRunViewer( tr( "the viewer program name is empty" ).toUtf8().data() );
}

bool ExternalViewer::stop()
{
  if( viewer.state() == QProcess::NotRunning )
    return true;
  viewer.terminate();
  QTimer::singleShot( 1000, &viewer, SLOT( kill() ) ); // In case terminate() fails.
  return false;
}

void ExternalViewer::stopSynchronously()
{
  // This implementation comes straight from QProcess::~QProcess().
  if( viewer.state() == QProcess::NotRunning )
    return;
  viewer.kill();
  viewer.waitForFinished();
}

void stopAndDestroySynchronously( ExternalViewer * viewer )
{
  if( !viewer )
    return;
  viewer->stopSynchronously();
  delete viewer;
}