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**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** This file is part of Qt Creator.
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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 "helpindexfilter.h"

#include "centralwidget.h"
#include "topicchooser.h"

#include <extensionsystem/pluginmanager.h>
#include <coreplugin/icore.h>
#include <coreplugin/helpmanager.h>

#include <QIcon>

using namespace Locator;
using namespace Help;
using namespace Help::Internal;

Q_DECLARE_METATYPE(ILocatorFilter*)

HelpIndexFilter::HelpIndexFilter()
{
    setIncludedByDefault(false);
    setShortcutString(QString(QLatin1Char('?')));
    m_icon = QIcon(QLatin1String(":/help/images/bookmark.png"));
}

HelpIndexFilter::~HelpIndexFilter()
{
}

QString HelpIndexFilter::displayName() const
{
    return tr("Help Index");
}

QString HelpIndexFilter::id() const
{
    return QLatin1String("HelpIndexFilter");
}

ILocatorFilter::Priority HelpIndexFilter::priority() const
{
    return Medium;
}

QList<FilterEntry> HelpIndexFilter::matchesFor(QFutureInterface<Locator::FilterEntry> &future, const QString &entry)
{
    QStringList keywords;
    if (entry.length() < 2)
        keywords = Core::HelpManager::instance()->findKeywords(entry, 200);
    else
        keywords = Core::HelpManager::instance()->findKeywords(entry);

    QList<FilterEntry> entries;
    foreach (const QString &keyword, keywords) {
        if (future.isCanceled())
            break;
        entries.append(FilterEntry(this, keyword, QVariant(), m_icon));
    }

    return entries;
}

void HelpIndexFilter::accept(FilterEntry selection) const
{
    const QString &key = selection.displayName;
    const QMap<QString, QUrl> &links = Core::HelpManager::instance()->linksForKeyword(key);

    if (links.size() == 1) {
        emit linkActivated(links.begin().value());
    } else if (!links.isEmpty()) {
        TopicChooser tc(CentralWidget::instance(), key, links);
        if (tc.exec() == QDialog::Accepted)
            emit linkActivated(tc.link());
    }
}

void HelpIndexFilter::refresh(QFutureInterface<void> &future)
{
    Q_UNUSED(future)
    // Nothing to refresh
}