/****************************************************************************
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** This file is part of the examples of the Qt Toolkit.
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** contained in the Technology Preview License Agreement accompanying
** this package.
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** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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****************************************************************************/

#include <QtCore/QByteArray>
#include <QtCore/QDir>
#include <QtCore/QLibraryInfo>
#include <QtCore/QProcess>

#include <QtGui/QMessageBox>

#include "assistant.h"

Assistant::Assistant()
    : proc(0)
{
}

//! [0]
Assistant::~Assistant()
{
    if (proc && proc->state() == QProcess::Running) {
        proc->terminate();
        proc->waitForFinished(3000);
    }
    delete proc;
}
//! [0]

//! [1]
void Assistant::showDocumentation(const QString &page)
{
    if (!startAssistant())
        return;

    QByteArray ba("SetSource ");
    ba.append("qthelp://com.trolltech.examples.simpletextviewer/doc/");
    
    proc->write(ba + page.toLocal8Bit() + '\0');
}
//! [1]

//! [2]
bool Assistant::startAssistant()
{
    if (!proc)
        proc = new QProcess();

    if (proc->state() != QProcess::Running) {
        QString app = QLibraryInfo::location(QLibraryInfo::BinariesPath) + QDir::separator();
#if !defined(Q_OS_MAC)
        app += QLatin1String("assistant");
#else
        app += QLatin1String("Assistant.app/Contents/MacOS/Assistant");    
#endif

        QStringList args;
        args << QLatin1String("-collectionFile")
            << QLibraryInfo::location(QLibraryInfo::ExamplesPath)
            + QLatin1String("/help/simpletextviewer/documentation/simpletextviewer.qhc")
            << QLatin1String("-enableRemoteControl");

        proc->start(app, args);

        if (!proc->waitForStarted()) {
            QMessageBox::critical(0, QObject::tr("Simple Text Viewer"),
                QObject::tr("Unable to launch Qt Assistant (%1)").arg(app));
            return false;
        }    
    }
    return true;
}
//! [2]