/***************************************************************************
 *   Copyright © 2013 Aleix Pol Gonzalez <aleixpol@blue-systems.com>       *
 *   Copyright © 2017 Jan Grulich <jgrulich@redhat.com>                    *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or         *
 *   modify it under the terms of the GNU General Public License as        *
 *   published by the Free Software Foundation; either version 2 of        *
 *   the License or (at your option) version 3 or any later version        *
 *   accepted by the membership of KDE e.V. (or its successor approved     *
 *   by the membership of KDE e.V.), which shall act as a proxy            *
 *   defined in Section 14 of version 3 of the license.                    *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
 ***************************************************************************/

#include "FlatpakResource.h"
#include "FlatpakBackend.h"

#include <Transaction/AddonList.h>

#include <AppStreamQt/icon.h>
#include <AppStreamQt/screenshot.h>
#include <appstream/AppStreamUtils.h>

#include <KFormat>
#include <KLocalizedString>

#include <QDir>
#include <QDebug>
#include <QDesktopServices>
#include <QIcon>
#include <QFileInfo>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QNetworkRequest>
#include <QStringList>
#include <QTimer>
#include <AppStreamQt/release.h>

static QString iconCachePath(const AppStream::Icon &icon)
{
    Q_ASSERT(icon.kind() == AppStream::Icon::KindRemote);
    return QStringLiteral("%1/icons/%2").arg(QStandardPaths::writableLocation(QStandardPaths::CacheLocation)).arg(icon.url().fileName());
}

FlatpakResource::FlatpakResource(const AppStream::Component &component, FlatpakInstallation* installation, FlatpakBackend *parent)
    : AbstractResource(parent)
    , m_appdata(component)
    , m_id({installation, QString(), FlatpakResource::DesktopApp, component.id(), QString(), QString() })
    , m_downloadSize(0)
    , m_installedSize(0)
    , m_propertyStates({{DownloadSize, NotKnownYet}, {InstalledSize, NotKnownYet},{RequiredRuntime, NotKnownYet}})
    , m_state(AbstractResource::None)
{
    setObjectName(packageName());

    // Start fetching remote icons during initialization
    const auto icons = m_appdata.icons();
    if (!icons.isEmpty()) {
        foreach (const AppStream::Icon &icon, icons) {
            if (icon.kind() == AppStream::Icon::KindRemote) {
                const QString fileName = iconCachePath(icon);
                if (!QFileInfo::exists(fileName)) {
                    const QDir cacheDir(QStandardPaths::writableLocation(QStandardPaths::CacheLocation));
                    // Create $HOME/.cache/discover/icons folder
                    cacheDir.mkdir(QStringLiteral("icons"));
                    QNetworkAccessManager *manager = new QNetworkAccessManager(this);
                    connect(manager, &QNetworkAccessManager::finished, [this, icon, fileName, manager] (QNetworkReply *reply) {
                        if (reply->error() == QNetworkReply::NoError) {
                            QByteArray iconData = reply->readAll();
                            QFile file(fileName);
                            if (file.open(QIODevice::WriteOnly)) {
                                file.write(iconData);
                            }
                            file.close();
                            Q_EMIT iconChanged();
                        }
                        manager->deleteLater();
                    });
                    manager->get(QNetworkRequest(icon.url()));
                }
            }
        }
    }
}

AppStream::Component FlatpakResource::appstreamComponent() const
{
    return m_appdata;
}

QList<PackageState> FlatpakResource::addonsInformation()
{
    return {};
}

QString FlatpakResource::availableVersion() const
{
    QString theBranch = branch();
    if (theBranch.isEmpty()) {
        theBranch = i18n("Unknown");
    }

    if (!m_appdata.releases().isEmpty()) {
        auto release = m_appdata.releases().constFirst();
        return i18n("%1 (%2)", release.version(), theBranch);
    }

    return theBranch;
}

QString FlatpakResource::appstreamId() const
{
    return m_id.id;
}

QString FlatpakResource::arch() const
{
    return m_id.arch;
}

QString FlatpakResource::branch() const
{
    return m_id.branch;
}

bool FlatpakResource::canExecute() const
{
    return (m_id.type == DesktopApp && (m_state == AbstractResource::Installed || m_state == AbstractResource::Upgradeable));
}

void FlatpakResource::updateFromRef(FlatpakRef* ref)
{
    setArch(QString::fromUtf8(flatpak_ref_get_arch(ref)));
    setBranch(QString::fromUtf8(flatpak_ref_get_branch(ref)));
    setCommit(QString::fromUtf8(flatpak_ref_get_commit(ref)));
    setFlatpakName(QString::fromUtf8(flatpak_ref_get_name(ref)));
    setType(flatpak_ref_get_kind(ref) == FLATPAK_REF_KIND_APP ? FlatpakResource::DesktopApp : FlatpakResource::Runtime);
    setObjectName(packageName());
}

QStringList FlatpakResource::categories()
{
    auto cats = m_appdata.categories();
    if (m_appdata.kind() != AppStream::Component::KindAddon)
        cats.append(QStringLiteral("Application"));
    return cats;
}

QString FlatpakResource::comment()
{
    const auto summary = m_appdata.summary();
    if (!summary.isEmpty()) {
        return summary;
    }

    return QString();
}

QString FlatpakResource::commit() const
{
    return m_commit;
}

int FlatpakResource::downloadSize() const
{
    return m_downloadSize;
}

QVariant FlatpakResource::icon() const
{
    QIcon ret;
    const auto icons = m_appdata.icons();

    if (!m_bundledIcon.isNull()) {
        ret = QIcon(m_bundledIcon);
    } else if (icons.isEmpty()) {
        ret = QIcon::fromTheme(QStringLiteral("package-x-generic"));
    } else foreach(const AppStream::Icon &icon, icons) {
        switch (icon.kind()) {
            case AppStream::Icon::KindLocal:
            case AppStream::Icon::KindCached: {
                const QString path = m_iconPath + icon.url().path();
                if (QFileInfo::exists(path)) {
                    ret.addFile(path, icon.size());
                } else {
                    const QString altPath = m_iconPath + QStringLiteral("%1x%2/").arg(icon.size().width()).arg(icon.size().height()) + icon.url().path();
                    if (QFileInfo::exists(altPath)) {
                        ret.addFile(altPath, icon.size());
                    }
                }
            }   break;
            case AppStream::Icon::KindStock: {
                const auto ret = QIcon::fromTheme(icon.name());
                if (!ret.isNull())
                    return ret;
                break;
            }
            case AppStream::Icon::KindRemote: {
                const QString fileName = iconCachePath(icon);
                if (QFileInfo::exists(fileName)) {
                    ret.addFile(fileName, icon.size());
                }
                break;
            }
            case AppStream::Icon::KindUnknown:
                break;
        }
    }

    if (ret.isNull()) {
        ret = QIcon::fromTheme(QStringLiteral("package-x-generic"));
    }

    return ret;
}

QString FlatpakResource::installedVersion() const
{
    // TODO check if there is actually version available
    QString version = branch();
    if (version.isEmpty()) {
        version = i18n("Unknown");
    }

    return version;
}

int FlatpakResource::installedSize() const
{
    return m_installedSize;
}

bool FlatpakResource::isTechnical() const
{
    return m_id.type == FlatpakResource::Runtime;
}

QUrl FlatpakResource::homepage()
{
    return m_appdata.url(AppStream::Component::UrlKindHomepage);
}

QUrl FlatpakResource::helpURL()
{
    return m_appdata.url(AppStream::Component::UrlKindHelp);
}

QUrl FlatpakResource::bugURL()
{
    return m_appdata.url(AppStream::Component::UrlKindBugtracker);
}

QUrl FlatpakResource::donationURL()
{
    return m_appdata.url(AppStream::Component::UrlKindDonation);
}

QString FlatpakResource::flatpakFileType() const
{
    return m_flatpakFileType;
}

QString FlatpakResource::flatpakName() const
{
    // If the flatpak name is not known (known only for installed apps), then use
    // appstream id instead;
    if (m_flatpakName.isEmpty()) {
        return m_id.id;
    }

    return m_flatpakName;
}

QString FlatpakResource::license()
{
    return m_appdata.projectLicense();
}

QString FlatpakResource::longDescription()
{
    return m_appdata.description();
}

QString FlatpakResource::name() const
{
    QString name = m_appdata.name();
    if (name.isEmpty()) {
        name = flatpakName();
    }

    if (name.startsWith(QLatin1String("(Nightly) "))) {
        return name.mid(10);
    }

    return name;
}

QString FlatpakResource::origin() const
{
    return m_id.origin;
}

QString FlatpakResource::packageName() const
{
    return flatpakName() + QLatin1Char('/') + arch() + QLatin1Char('/') + branch();
}

FlatpakResource::PropertyState FlatpakResource::propertyState(FlatpakResource::PropertyKind kind) const
{
    return m_propertyStates[kind];
}

QUrl FlatpakResource::resourceFile() const
{
    return m_resourceFile;
}

QString FlatpakResource::runtime() const
{
    return m_runtime;
}

QString FlatpakResource::section()
{
    return QString();
}

int FlatpakResource::size()
{
    if (m_state == Installed) {
        return m_installedSize;
    } else {
        return m_downloadSize;
    }
}

QString FlatpakResource::sizeDescription()
{
    KFormat f;
    if (!isInstalled() || canUpgrade()) {
        if (propertyState(DownloadSize) == NotKnownYet || propertyState(InstalledSize) == NotKnownYet) {
            return i18n("Retrieving size information");
        } else if (propertyState(DownloadSize) == UnknownOrFailed || propertyState(InstalledSize) == UnknownOrFailed) {
            return i18n("Unknown size");
        } else {
            return i18nc("@info app size", "%1 to download, %2 on disk", f.formatByteSize(downloadSize()), f.formatByteSize(installedSize()));
        }
    } else {
        if (propertyState(InstalledSize) == NotKnownYet) {
            return i18n("Retrieving size information");
        } else if (propertyState(InstalledSize) == UnknownOrFailed) {
            return i18n("Unknown size");
        } else {
            return i18nc("@info app size", "%1 on disk", f.formatByteSize(installedSize()));
        }
    }
}

AbstractResource::State FlatpakResource::state()
{
    return m_state;
}

FlatpakResource::ResourceType FlatpakResource::type() const
{
    return m_id.type;
}

QString FlatpakResource::typeAsString() const
{
    switch (m_id.type) {
        case FlatpakResource::DesktopApp:
        case FlatpakResource::Source:
            return QLatin1String("app");
        case FlatpakResource::Runtime:
            return QLatin1String("runtime");
        default:
            return QLatin1String("app");
    }
}

FlatpakResource::Id FlatpakResource::uniqueId() const
{
    return m_id;
}

void FlatpakResource::invokeApplication() const
{
    g_autoptr(GCancellable) cancellable = g_cancellable_new();
    g_autoptr(GError) localError = nullptr;

    if (!flatpak_installation_launch(m_id.installation,
                                     flatpakName().toUtf8().constData(),
                                     arch().toUtf8().constData(),
                                     branch().toUtf8().constData(),
                                     nullptr,
                                     cancellable,
                                     &localError)) {
        qWarning() << "Failed to launch " << m_appdata.name() << ": " << localError->message;
    }
}

void FlatpakResource::fetchChangelog()
{
    emit changelogFetched(AppStreamUtils::changelogToHtml(m_appdata));
}

void FlatpakResource::fetchScreenshots()
{
    const auto sc = AppStreamUtils::fetchScreenshots(m_appdata);
    Q_EMIT screenshotsFetched(sc.first, sc.second);
}

void FlatpakResource::setArch(const QString &arch)
{
    m_id.arch = arch;
}

void FlatpakResource::setBranch(const QString &branch)
{
    m_id.branch = branch;
}

void FlatpakResource::setBundledIcon(const QPixmap &pixmap)
{
    m_bundledIcon = pixmap;
}

void FlatpakResource::setCommit(const QString &commit)
{
    m_commit = commit;
}

void FlatpakResource::setDownloadSize(int size)
{
    m_downloadSize = size;

    setPropertyState(DownloadSize, AlreadyKnown);

    Q_EMIT sizeChanged();
}

void FlatpakResource::setFlatpakFileType(const QString &fileType)
{
    m_flatpakFileType = fileType;
}

void FlatpakResource::setFlatpakName(const QString &name)
{
    m_flatpakName = name;
}

void FlatpakResource::setIconPath(const QString &path)
{
    m_iconPath = path;
}

void FlatpakResource::setInstalledSize(int size)
{
    m_installedSize = size;

    setPropertyState(InstalledSize, AlreadyKnown);

    Q_EMIT sizeChanged();
}

void FlatpakResource::setOrigin(const QString &origin)
{
    m_id.origin = origin;
}

void FlatpakResource::setPropertyState(FlatpakResource::PropertyKind kind, FlatpakResource::PropertyState newState)
{
    auto & state = m_propertyStates[kind];
    if (state != newState) {
        state = newState;

        Q_EMIT propertyStateChanged(kind, newState);
    }
}

void FlatpakResource::setResourceFile(const QUrl &url)
{
    m_resourceFile = url;
}

void FlatpakResource::setRuntime(const QString &runtime)
{
    m_runtime = runtime;

    setPropertyState(RequiredRuntime, AlreadyKnown);
}

void FlatpakResource::setState(AbstractResource::State state)
{
    if (m_state != state) {
        m_state = state;

        if (!backend()->isFetching())
            Q_EMIT stateChanged();
    }
}

void FlatpakResource::setType(FlatpakResource::ResourceType type)
{
    m_id.type = type;
}

QString FlatpakResource::installationPath() const
{
    return installationPath(m_id.installation);
}

QString FlatpakResource::installationPath(FlatpakInstallation* flatpakInstallation)
{
    g_autoptr(GFile) path = flatpak_installation_get_path(flatpakInstallation);
    return QString::fromUtf8(g_file_get_path(path));
}

QUrl FlatpakResource::url() const
{
    return m_resourceFile.isEmpty() ? QUrl(QStringLiteral("appstream://") + appstreamId()) : m_resourceFile;
}

QDate FlatpakResource::releaseDate() const
{
    if (!m_appdata.releases().isEmpty()) {
        auto release = m_appdata.releases().constFirst();
        return release.timestamp().date();
    }

    return {};
}
