/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Qt Assistant of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** 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
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qhelpengine.h"
#include "qhelpengine_p.h"
#include "qhelpdbreader_p.h"
#include "qhelpcontentwidget.h"
#include "qhelpindexwidget.h"
#include "qhelpsearchengine.h"
#include "qhelpcollectionhandler_p.h"

#include <QtCore/QDir>
#include <QtCore/QFile>
#include <QtCore/QLibrary>
#include <QtCore/QPluginLoader>
#include <QtGui/QApplication>
#include <QtSql/QSqlQuery>

QT_BEGIN_NAMESPACE

QHelpEnginePrivate::QHelpEnginePrivate()
    : QHelpEngineCorePrivate()
    , contentModel(0)
    , contentWidget(0)
    , indexModel(0)
    , indexWidget(0)
    , searchEngine(0)
{
}

QHelpEnginePrivate::~QHelpEnginePrivate()
{
}

void QHelpEnginePrivate::init(const QString &collectionFile,
                              QHelpEngineCore *helpEngineCore)
{
    QHelpEngineCorePrivate::init(collectionFile, helpEngineCore);

    contentModel = new QHelpContentModel(this);
    indexModel = new QHelpIndexModel(this);

    connect(helpEngineCore, SIGNAL(setupFinished()),
        this, SLOT(applyCurrentFilter()));
    connect(helpEngineCore, SIGNAL(currentFilterChanged(QString)),
        this, SLOT(applyCurrentFilter()));

}

void QHelpEnginePrivate::applyCurrentFilter()
{
    if (!error.isEmpty())
        return;
    contentModel->createContents(currentFilter);
    indexModel->createIndex(currentFilter);
}

void QHelpEnginePrivate::setContentsWidgetBusy()
{
    contentWidget->setCursor(Qt::WaitCursor);
}

void QHelpEnginePrivate::unsetContentsWidgetBusy()
{
    contentWidget->unsetCursor();
}

void QHelpEnginePrivate::setIndexWidgetBusy()
{
    indexWidget->setCursor(Qt::WaitCursor);
}

void QHelpEnginePrivate::unsetIndexWidgetBusy()
{
    indexWidget->unsetCursor();
}

void QHelpEnginePrivate::stopDataCollection()
{
    contentModel->invalidateContents(true);
    indexModel->invalidateIndex(true);
}



/*!
    \class QHelpEngine
    \since 4.4
    \inmodule QtHelp
    \brief The QHelpEngine class provides access to contents and
    indices of the help engine.


*/

/*!
    Constructs a new help engine with the given \a parent. The help
    engine uses the information stored in the \a collectionFile for
    providing help. If the collection file does not already exist,
    it will be created.
*/
QHelpEngine::QHelpEngine(const QString &collectionFile, QObject *parent)
    : QHelpEngineCore(d = new QHelpEnginePrivate(), parent)
{
    d->init(collectionFile, this);
}

/*!
    Destroys the help engine object.
*/
QHelpEngine::~QHelpEngine()
{
    d->stopDataCollection();
}

/*!
    Returns the content model.
*/
QHelpContentModel *QHelpEngine::contentModel() const
{
    return d->contentModel;
}

/*!
    Returns the index model.
*/
QHelpIndexModel *QHelpEngine::indexModel() const
{
    return d->indexModel;
}

/*!
    Returns the content widget.
*/
QHelpContentWidget *QHelpEngine::contentWidget()
{
    if (!d->contentWidget) {
        d->contentWidget = new QHelpContentWidget();
        d->contentWidget->setModel(d->contentModel);
        connect(d->contentModel, SIGNAL(contentsCreationStarted()),
            d, SLOT(setContentsWidgetBusy()));
        connect(d->contentModel, SIGNAL(contentsCreated()),
            d, SLOT(unsetContentsWidgetBusy()));
    }
    return d->contentWidget;
}

/*!
    Returns the index widget.
*/
QHelpIndexWidget *QHelpEngine::indexWidget()
{
    if (!d->indexWidget) {
        d->indexWidget = new QHelpIndexWidget();
        d->indexWidget->setModel(d->indexModel);
        connect(d->indexModel, SIGNAL(indexCreationStarted()),
            d, SLOT(setIndexWidgetBusy()));
        connect(d->indexModel, SIGNAL(indexCreated()),
            d, SLOT(unsetIndexWidgetBusy()));
    }
    return d->indexWidget;
}

/*!
    Returns the default search engine.
*/
QHelpSearchEngine* QHelpEngine::searchEngine()
{
    if (!d->searchEngine)
        d->searchEngine = new QHelpSearchEngine(this, this);
    return d->searchEngine;
}

QT_END_NAMESPACE
