/*
 * SPDX-FileCopyrightText: 2008-2012 Peter Penz <peter.penz19@gmail.com>
 * SPDX-FileCopyrightText: 2021 Kai Uwe Broulik <kde@broulik.de>
 *
 * Based on KFilePlacesView from kdelibs:
 * SPDX-FileCopyrightText: 2007 Kevin Ottens <ervin@kde.org>
 * SPDX-FileCopyrightText: 2007 David Faure <faure@kde.org>
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "placespanel.h"

#include "dolphin_generalsettings.h"
#include "dolphin_placespanelsettings.h"
#include "dolphinplacesmodelsingleton.h"
#include "settings/dolphinsettingsdialog.h"
#include "views/draganddrophelper.h"

#include <KFilePlacesModel>
#include <KIO/DropJob>
#include <KIO/Job>
#include <KLocalizedString>
#include <KProtocolManager>

#include <QIcon>
#include <QMenu>
#include <QMimeData>
#include <QShowEvent>

#include <Solid/StorageAccess>

PlacesPanel::PlacesPanel(QWidget *parent)
    : KFilePlacesView(parent)
{
    setDropOnPlaceEnabled(true);
    connect(this, &PlacesPanel::urlsDropped, this, &PlacesPanel::slotUrlsDropped);

    setAutoResizeItemsEnabled(false);

    setTeardownFunction([this](const QModelIndex &index) {
        slotTearDownRequested(index);
    });

    m_openInSplitView = new QAction(QIcon::fromTheme(QStringLiteral("view-right-new")), i18nc("@action:inmenu", "Open in Split View"));
    m_openInSplitView->setPriority(QAction::HighPriority);
    connect(m_openInSplitView, &QAction::triggered, this, [this]() {
        const QUrl url = currentIndex().data(KFilePlacesModel::UrlRole).toUrl();
        Q_EMIT openInSplitViewRequested(url);
    });
    addAction(m_openInSplitView);

    m_configureTrashAction = new QAction(QIcon::fromTheme(QStringLiteral("configure")), i18nc("@action:inmenu", "Configure Trash…"));
    m_configureTrashAction->setPriority(QAction::HighPriority);
    connect(m_configureTrashAction, &QAction::triggered, this, &PlacesPanel::slotConfigureTrash);
    addAction(m_configureTrashAction);

    connect(this, &PlacesPanel::contextMenuAboutToShow, this, &PlacesPanel::slotContextMenuAboutToShow);

    connect(this, &PlacesPanel::iconSizeChanged, this, [](const QSize &newSize) {
        int iconSize = qMin(newSize.width(), newSize.height());
        if (iconSize == 0) {
            // Don't store 0 size, let's keep -1 for default/small/automatic
            iconSize = -1;
        }
        PlacesPanelSettings *settings = PlacesPanelSettings::self();
        settings->setIconSize(iconSize);
        settings->save();
    });
}

PlacesPanel::~PlacesPanel() = default;

void PlacesPanel::setUrl(const QUrl &url)
{
    // KFilePlacesView::setUrl no-ops when no model is set but we only set it in showEvent()
    // Remember the URL and set it in showEvent
    m_url = url;
    KFilePlacesView::setUrl(url);
}

QList<QAction *> PlacesPanel::customContextMenuActions() const
{
    return m_customContextMenuActions;
}

void PlacesPanel::setCustomContextMenuActions(const QList<QAction *> &actions)
{
    m_customContextMenuActions = actions;
}

void PlacesPanel::proceedWithTearDown()
{
    if (m_indexToTearDown.isValid()) {
        auto *placesModel = static_cast<KFilePlacesModel *>(model());
        placesModel->requestTeardown(m_indexToTearDown);
    } else {
        qWarning() << "Places entry to tear down is no longer valid";
    }
}

void PlacesPanel::readSettings()
{
    if (GeneralSettings::autoExpandFolders()) {
        setDragAutoActivationDelay(750);
    } else {
        setDragAutoActivationDelay(0);
    }

    const int iconSize = qMax(0, PlacesPanelSettings::iconSize());
    setIconSize(QSize(iconSize, iconSize));
}

void PlacesPanel::showEvent(QShowEvent *event)
{
    if (!event->spontaneous() && !model()) {
        readSettings();

        auto *placesModel = DolphinPlacesModelSingleton::instance().placesModel();
        setModel(placesModel);

        connect(placesModel, &KFilePlacesModel::errorMessage, this, &PlacesPanel::errorMessage);
        connect(placesModel, &KFilePlacesModel::teardownDone, this, &PlacesPanel::slotTearDownDone);

        connect(placesModel, &QAbstractItemModel::rowsInserted, this, &PlacesPanel::slotRowsInserted);
        connect(placesModel, &QAbstractItemModel::rowsAboutToBeRemoved, this, &PlacesPanel::slotRowsAboutToBeRemoved);

        for (int i = 0; i < model()->rowCount(); ++i) {
            connectDeviceSignals(model()->index(i, 0, QModelIndex()));
        }

        setUrl(m_url);
    }

    KFilePlacesView::showEvent(event);
}

static bool isInternalDrag(const QMimeData *mimeData)
{
    const auto formats = mimeData->formats();
    for (const auto &format : formats) {
        // from KFilePlacesModel::_k_internalMimetype
        if (format.startsWith(QLatin1String("application/x-kfileplacesmodel-"))) {
            return true;
        }
    }
    return false;
}

void PlacesPanel::dragMoveEvent(QDragMoveEvent *event)
{
    const QModelIndex index = indexAt(event->position().toPoint());
    if (index.isValid()) {
        auto *placesModel = static_cast<KFilePlacesModel *>(model());

        // Reject drag ontop of a non-writable protocol
        // We don't know whether we're dropping inbetween or ontop of a place
        // so still allow internal drag events so that re-arranging still works.
        if (!isInternalDrag(event->mimeData())) {
            const QUrl url = placesModel->url(index);
            if (!url.isValid() || !KProtocolManager::supportsWriting(url)) {
                event->setDropAction(Qt::IgnoreAction);
            } else {
                DragAndDropHelper::updateDropAction(event, url);
            }
        }
    }

    KFilePlacesView::dragMoveEvent(event);
}

void PlacesPanel::slotConfigureTrash()
{
    const QUrl url = currentIndex().data(KFilePlacesModel::UrlRole).toUrl();

    DolphinSettingsDialog *settingsDialog = new DolphinSettingsDialog(url, this);
    settingsDialog->setCurrentPage(settingsDialog->trashSettings);
    settingsDialog->setAttribute(Qt::WA_DeleteOnClose);
    settingsDialog->show();
}

void PlacesPanel::slotUrlsDropped(const QUrl &dest, QDropEvent *event, QWidget *parent)
{
    KIO::DropJob *job = DragAndDropHelper::dropUrls(dest, event, parent);
    if (job) {
        connect(job, &KIO::DropJob::result, this, [this](KJob *job) {
            if (job->error() && job->error() != KIO::ERR_USER_CANCELED) {
                Q_EMIT errorMessage(job->errorString());
            }
        });
    }
}

void PlacesPanel::slotContextMenuAboutToShow(const QModelIndex &index, QMenu *menu)
{
    Q_UNUSED(menu);

    auto *placesModel = static_cast<KFilePlacesModel *>(model());
    const QUrl url = placesModel->url(index);
    const Solid::Device device = placesModel->deviceForIndex(index);

    m_configureTrashAction->setVisible(url.scheme() == QLatin1String("trash"));
    m_openInSplitView->setVisible(url.isValid());

    // show customContextMenuActions only on the view's context menu
    if (!url.isValid() && !device.isValid()) {
        addActions(m_customContextMenuActions);
    } else {
        const auto actions = this->actions();
        for (QAction *action : actions) {
            if (m_customContextMenuActions.contains(action)) {
                removeAction(action);
            }
        }
    }
}

void PlacesPanel::slotTearDownRequested(const QModelIndex &index)
{
    auto *placesModel = static_cast<KFilePlacesModel *>(model());

    Solid::StorageAccess *storageAccess = placesModel->deviceForIndex(index).as<Solid::StorageAccess>();
    if (!storageAccess) {
        return;
    }

    m_indexToTearDown = QPersistentModelIndex(index);

    // disconnect the Solid::StorageAccess::teardownRequested
    // to prevent emitting PlacesPanel::storageTearDownExternallyRequested
    // after we have emitted PlacesPanel::storageTearDownRequested
    disconnect(storageAccess, &Solid::StorageAccess::teardownRequested, this, &PlacesPanel::slotTearDownRequestedExternally);
    Q_EMIT storageTearDownRequested(storageAccess->filePath());
}

void PlacesPanel::slotTearDownRequestedExternally(const QString &udi)
{
    Q_UNUSED(udi);
    auto *storageAccess = static_cast<Solid::StorageAccess *>(sender());

    Q_EMIT storageTearDownExternallyRequested(storageAccess->filePath());
}

void PlacesPanel::slotTearDownDone(const QModelIndex &index, Solid::ErrorType error, const QVariant &errorData)
{
    Q_UNUSED(errorData); // All error handling is currently done in frameworks.

    if (index == m_indexToTearDown) {
        if (error == Solid::ErrorType::NoError) {
            // No error; it must have been unmounted successfully
            Q_EMIT storageTearDownSuccessful();
        }
        m_indexToTearDown = QPersistentModelIndex();
    }
}

void PlacesPanel::slotRowsInserted(const QModelIndex &parent, int first, int last)
{
    for (int i = first; i <= last; ++i) {
        connectDeviceSignals(model()->index(first, 0, parent));
    }
}

void PlacesPanel::slotRowsAboutToBeRemoved(const QModelIndex &parent, int first, int last)
{
    auto *placesModel = static_cast<KFilePlacesModel *>(model());

    for (int i = first; i <= last; ++i) {
        const QModelIndex index = placesModel->index(i, 0, parent);

        Solid::StorageAccess *storageAccess = placesModel->deviceForIndex(index).as<Solid::StorageAccess>();
        if (!storageAccess) {
            continue;
        }

        disconnect(storageAccess, &Solid::StorageAccess::teardownRequested, this, nullptr);
    }
}

void PlacesPanel::connectDeviceSignals(const QModelIndex &index)
{
    auto *placesModel = static_cast<KFilePlacesModel *>(model());

    Solid::StorageAccess *storageAccess = placesModel->deviceForIndex(index).as<Solid::StorageAccess>();
    if (!storageAccess) {
        return;
    }

    connect(storageAccess, &Solid::StorageAccess::teardownRequested, this, &PlacesPanel::slotTearDownRequestedExternally);
}

#include "moc_placespanel.cpp"