/****************************************************************************

 Copyright (C) 2002-2014 Gilles Debunne. All rights reserved.

 This file is part of the QGLViewer library version 2.6.2.

 http://www.libqglviewer.com - contact@libqglviewer.com

 This file may be used under the terms of the GNU General Public License 
 versions 2.0 or 3.0 as published by the Free Software Foundation and
 appearing in the LICENSE file included in the packaging of this file.
 In addition, as a special exception, Gilles Debunne gives you certain 
 additional rights, described in the file GPL_EXCEPTION in this package.

 libQGLViewer uses dual licensing. Commercial/proprietary software must
 purchase a libQGLViewer Commercial License.

 This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

*****************************************************************************/

#include "computerPlayer.h"
#include <qfiledialog.h>
#include <qmessagebox.h>
#include "qlineedit.h"
#include "qpushbutton.h"
#include "qspinbox.h"
#include "qprocess.h"

#if QT_VERSION >= 0x040000
# include "ui_computerPlayerInterface.h"
# include <QTime>
  class ComputerPlayerInterface : public QDialog, public Ui::ComputerPlayerInterface
  {
  public:
    ComputerPlayerInterface() { setupUi(this); }
  };
#else
# include "qdatetime.h"
# if QT_VERSION >= 0x030000
#  include "computerPlayerInterface.Qt3.h"
# else
#  error "No designer .ui file available for Qt 2"
# endif
#endif

static QTime Clock;

ComputerPlayer::ComputerPlayer()
  : isActive_(false)
{
  interface_ = new ComputerPlayerInterface();

  connect(interface_->browseButton, SIGNAL(released()), this, SLOT(selectProgram()));
  interface_->hide();

  setAllowedTime(3);
}

ComputerPlayer::~ComputerPlayer()
{
  delete interface_;
}

void ComputerPlayer::selectProgram()
{
#if QT_VERSION < 0x040000
  QString fileName = QFileDialog::getOpenFileName(programFileName(), "Computer programs (*)", NULL);
#else
  QString fileName = QFileDialog::getOpenFileName(NULL, "Select a computer program", programFileName(), "Computer programs (*)");
#endif

  if (!fileName.isEmpty())
    setProgramFileName(fileName);
}

void ComputerPlayer::setIsActive(bool on)
{
  if (on && (programFileName().isEmpty()))
    configure();
  isActive_ = on;
}

void ComputerPlayer::configure()
{
  int previousAllowedTime = allowedTime();
  QString previousProgramFileName = programFileName();
  
  if (interface_->exec() == QDialog::Rejected)
    {
      setAllowedTime(previousAllowedTime);
      setProgramFileName(previousProgramFileName);
    }
}

int ComputerPlayer::allowedTime() const
{
  return interface_->allowedTimeSpinBox->value();
}

void ComputerPlayer::setAllowedTime(int time)
{
  interface_->allowedTimeSpinBox->setValue(time);
}


QString ComputerPlayer::programFileName() const
{
  return interface_->programNameLineEdit->text();
}

void ComputerPlayer::setProgramFileName(const QString& name)
{
  interface_->programNameLineEdit->setText(name);
}

void ComputerPlayer::play(bool blue, const QString& stateFileName)
{
  if (!isActive_)
    return; // So that human user can play

  while (true)
    {
      const QFileInfo fi(programFileName());
      
      if (fi.exists())
	if (fi.isExecutable())
	  {
#if QT_VERSION < 0x040000
	    process_ = new QProcess(programFileName());
	    process_->addArgument(stateFileName);
	    process_->addArgument(QString::number(blue?allowedTime():-allowedTime()));
	    connect(process_, SIGNAL(processExited()), this, SLOT(readFromStdout()));
	    if (process_->start())
#else
	    process_ = new QProcess();
	    connect(process_, SIGNAL(finished(int)), this, SLOT(readFromStdout()));
	    process_->start(programFileName(), QStringList() << stateFileName << QString::number(blue?allowedTime():-allowedTime()));
	    if (process_->waitForStarted())
#endif
	      {
		Clock.start();
		break;
	      }
	    else
	      QMessageBox::warning(NULL ,"Unable to start process",
				   "Unable to start process.\nSelect another program or update permissions");
	  }
	else
	  QMessageBox::warning(NULL ,"Non executable program file",
			       "Program file cannot be executed.\nSelect another program or update permissions.");
      else
	QMessageBox::warning(NULL ,"Program file not found", "Program file does not exist.\nSelect another program.");

      configure();
    }
}

void ComputerPlayer::readFromStdout()
{
  int duration = Clock.elapsed();
#if QT_VERSION < 0x040000
  QString result = process_->readLineStdout();
#else
  QString result = QString((process_->readAllStandardOutput()).trimmed());
#endif
  Q_EMIT moveMade(result, duration);
#if QT_VERSION < 0x040000
  delete process_;
#else
  process_->deleteLater();
#endif  
}
