/**************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Installer Framework.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
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**************************************************************************/

#include "updatechecker.h"

#include <binaryformatenginehandler.h>
#include <component.h>
#include <errors.h>
#include <init.h>
#include <runoncechecker.h>
#include <packagemanagercore.h>
#include <productkeycheck.h>

#include <QDir>
#include <QDomDocument>

#include <iostream>

UpdateChecker::UpdateChecker(int &argc, char *argv[])
    : SDKApp<QCoreApplication>(argc, argv)
{
    QInstaller::init(); // register custom operations
}

int UpdateChecker::check()
{
    RunOnceChecker runCheck(QDir::tempPath()
                            + QLatin1Char('/')
                            + qApp->applicationName()
                            + QLatin1String("15021976.lock"));
    if (runCheck.isRunning(RunOnceChecker::ConditionFlag::Lockfile)) {
        // It is possible to install an application and thus the maintenance tool into a
        // directory that requires elevated permission to create a lock file. Since this
        // cannot be done without requesting credentials from the user, we silently ignore
        // the fact that we could not create the lock file and check the running processes.
        if (runCheck.isRunning(RunOnceChecker::ConditionFlag::ProcessList))
            throw QInstaller::Error(QLatin1String("An instance is already checking for updates."));
    }

    QString fileName = datFile(binaryFile());
    quint64 cookie = QInstaller::BinaryContent::MagicCookieDat;
    if (fileName.isEmpty()) {
        fileName = binaryFile();
        cookie = QInstaller::BinaryContent::MagicCookie;
    }

    QFile binary(fileName);
    QInstaller::openForRead(&binary);

    qint64 magicMarker;
    QList<QInstaller::OperationBlob> operations;
    QInstaller::ResourceCollectionManager manager;
    QInstaller::BinaryContent::readBinaryContent(&binary, &operations, &manager, &magicMarker,
        cookie);

    if (magicMarker == QInstaller::BinaryContent::MagicInstallerMarker)
        throw QInstaller::Error(QLatin1String("Installers cannot check for updates."));

    SDKApp::registerMetaResources(manager.collectionByName("QResources"));

    QInstaller::PackageManagerCore core(QInstaller::BinaryContent::MagicUpdaterMarker, operations);
    QInstaller::PackageManagerCore::setVirtualComponentsVisible(true);
    {
        using namespace QInstaller;
        ProductKeyCheck::instance()->init(&core);
        ProductKeyCheck::instance()->addPackagesFromXml(QLatin1String(":/metadata/Updates.xml"));
        BinaryFormatEngineHandler::instance()->registerResources(manager.collections());
    }
    if (!core.fetchRemotePackagesTree())
        throw QInstaller::Error(core.error());

    const QList<QInstaller::Component *> components =
        core.components(QInstaller::PackageManagerCore::ComponentType::Root);
    if (components.isEmpty())
        throw QInstaller::Error(QLatin1String("There are currently no updates available."));

    QDomDocument doc;
    QDomElement root = doc.createElement(QLatin1String("updates"));
    doc.appendChild(root);

    foreach (QInstaller::Component *component, components) {
        QDomElement update = doc.createElement(QLatin1String("update"));
        update.setAttribute(QLatin1String("name"), component->value(QInstaller::scDisplayName));
        update.setAttribute(QLatin1String("version"), component->value(QInstaller::scVersion));
        update.setAttribute(QLatin1String("size"), component->value(QInstaller::scUncompressedSize));
        root.appendChild(update);
    }

    std::cout << qPrintable(doc.toString(4)) << std::endl;
    return EXIT_SUCCESS;
}