/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt Assistant of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "tracer.h"

#include <QtCore/QDir>
#include <QtCore/QLibraryInfo>
#include <QtCore/QDateTime>
#include <QtCore/QFileSystemWatcher>
#include <QtHelp/QHelpEngineCore>
#include "helpenginewrapper.h"
#include "qtdocinstaller.h"

QT_BEGIN_NAMESPACE

QtDocInstaller::QtDocInstaller(const QList<DocInfo> &docInfos)
    : m_abort(false), m_docInfos(docInfos)
{
    TRACE_OBJ
}

QtDocInstaller::~QtDocInstaller()
{
    TRACE_OBJ
    if (!isRunning())
        return;
    m_mutex.lock();
    m_abort = true;
    m_mutex.unlock();
    wait();
}

void QtDocInstaller::installDocs()
{
    TRACE_OBJ
    start(LowPriority);
}

void QtDocInstaller::run()
{
    TRACE_OBJ
    m_qchDir = QLibraryInfo::location(QLibraryInfo::DocumentationPath);
    m_qchFiles = m_qchDir.entryList(QStringList() << QLatin1String("*.qch"));

    bool changes = false;
    foreach (const DocInfo &docInfo, m_docInfos) {
        changes |= installDoc(docInfo);
        m_mutex.lock();
        if (m_abort) {
            m_mutex.unlock();
            return;
        }
        m_mutex.unlock();
    }
    emit docsInstalled(changes);
}

bool QtDocInstaller::installDoc(const DocInfo &docInfo)
{
    TRACE_OBJ
    const QString &component = docInfo.first;
    const QStringList &info = docInfo.second;
    QDateTime dt;
    if (!info.isEmpty() && !info.first().isEmpty())
        dt = QDateTime::fromString(info.first(), Qt::ISODate);

    QString qchFile;
    if (info.count() == 2)
        qchFile = info.last();

    if (m_qchFiles.isEmpty()) {
        emit qchFileNotFound(component);
        return false;
    }
    foreach (const QString &f, m_qchFiles) {
        if (f.startsWith(component)) {
            QFileInfo fi(m_qchDir.absolutePath() + QDir::separator() + f);
            if (dt.isValid() && fi.lastModified().toTime_t() == dt.toTime_t()
                && qchFile == fi.absoluteFilePath())
                return false;
            emit registerDocumentation(component, fi.absoluteFilePath());
            return true;
        }
    }

    emit qchFileNotFound(component);
    return false;
}

QT_END_NAMESPACE
