/*
Gwenview: an image viewer
Copyright 2007 Aurélien Gâteau <agateau@kde.org>

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) any later version.

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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

*/
#include "mainwindow.h"
#include "gwenview_app_debug.h"
#include <config-gwenview.h>
#include "dialogguard.h"

// Qt
#include <QApplication>
#include <QDateTime>
#include <QLineEdit>
#include <QPushButton>
#include <QShortcut>
#include <QSplitter>
#include <QStackedWidget>
#include <QTimer>
#include <QUndoGroup>
#include <QVBoxLayout>
#include <QMenuBar>
#include <QUrl>
#include <QMouseEvent>
#ifdef Q_OS_OSX
#include <QFileOpenEvent>
#endif
#include <QJsonArray>
#include <QJsonObject>

// KDE
#include <KActionCategory>
#include <KActionCollection>
#include <QFileDialog>
#include <KFileItem>
#include <KLocalizedString>
#include <KMessageBox>
#include <KNotificationRestrictions>
#include <KProtocolManager>
#include <KLinkItemSelectionModel>
#include <KRecentFilesAction>
#include <KStandardShortcut>
#include <KToggleFullScreenAction>
#include <KUrlComboBox>
#include <KUrlNavigator>
#include <KToolBar>
#include <KToolBarPopupAction>
#include <KXMLGUIFactory>
#include <KDirLister>
#ifdef KF5Purpose_FOUND
#include <PurposeWidgets/Menu>
#include <Purpose/AlternativesModel>
#endif

// Local
#include "configdialog.h"
#include "documentinfoprovider.h"
#include "viewmainpage.h"
#include "fileopscontextmanageritem.h"
#include "folderviewcontextmanageritem.h"
#include "fullscreencontent.h"
#include "gvcore.h"
#include "imageopscontextmanageritem.h"
#include "infocontextmanageritem.h"
#ifdef KIPI_FOUND
#include "kipiexportaction.h"
#include "kipiinterface.h"
#endif
#ifndef GWENVIEW_SEMANTICINFO_BACKEND_NONE
#include "semanticinfocontextmanageritem.h"
#endif
#include "preloader.h"
#include "savebar.h"
#include "sidebar.h"
#include "splitter.h"
#include "startmainpage.h"
#include "thumbnailviewhelper.h"
#include "browsemainpage.h"
#include <lib/hud/hudbuttonbox.h>
#include <lib/archiveutils.h>
#include <lib/contextmanager.h>
#include <lib/disabledactionshortcutmonitor.h>
#include <lib/document/documentfactory.h>
#include <lib/documentonlyproxymodel.h>
#include <lib/gvdebug.h>
#include <lib/gwenviewconfig.h>
#include <lib/mimetypeutils.h>
#ifdef HAVE_QTDBUS
#include <lib/mpris2/mpris2service.h>
#endif
#include <lib/print/printhelper.h>
#include <lib/slideshow.h>
#include <lib/signalblocker.h>
#include <lib/semanticinfo/sorteddirmodel.h>
#include <lib/thumbnailprovider/thumbnailprovider.h>
#include <lib/thumbnailview/thumbnailbarview.h>
#include <lib/thumbnailview/thumbnailview.h>
#include <lib/urlutils.h>

namespace Gwenview
{

#undef ENABLE_LOG
#undef LOG
//#define ENABLE_LOG
#ifdef ENABLE_LOG
#define LOG(x) qCDebug(GWENVIEW_APP_LOG) << x
#else
#define LOG(x) ;
#endif

static const int BROWSE_PRELOAD_DELAY = 1000;
static const int VIEW_PRELOAD_DELAY = 100;

static const char* SESSION_CURRENT_PAGE_KEY = "Page";
static const char* SESSION_URL_KEY = "Url";

enum MainPageId {
    StartMainPageId,
    BrowseMainPageId,
    ViewMainPageId
};

struct MainWindowState
{
    bool mToolBarVisible;
};

/*

Layout of the main window looks like this:

.-mCentralSplitter-----------------------------.
|.-mSideBar--. .-mContentWidget---------------.|
||           | |.-mSaveBar-------------------.||
||           | ||                            |||
||           | |'----------------------------'||
||           | |.-mViewStackedWidget---------.||
||           | ||                            |||
||           | ||                            |||
||           | ||                            |||
||           | ||                            |||
||           | |'----------------------------'||
|'-----------' '------------------------------'|
'----------------------------------------------'

*/
struct MainWindow::Private
{
    GvCore* mGvCore;
    MainWindow* q;
    QSplitter* mCentralSplitter;
    QWidget* mContentWidget;
    ViewMainPage* mViewMainPage;
    KUrlNavigator* mUrlNavigator;
    ThumbnailView* mThumbnailView;
    ThumbnailView* mActiveThumbnailView;
    DocumentInfoProvider* mDocumentInfoProvider;
    ThumbnailViewHelper* mThumbnailViewHelper;
    QPointer<ThumbnailProvider> mThumbnailProvider;
    BrowseMainPage* mBrowseMainPage;
    StartMainPage* mStartMainPage;
    SideBar* mSideBar;
    QStackedWidget* mViewStackedWidget;
    FullScreenContent* mFullScreenContent;
    SaveBar* mSaveBar;
    bool mStartSlideShowWhenDirListerCompleted;
    SlideShow* mSlideShow;
#ifdef HAVE_QTDBUS
    Mpris2Service* mMpris2Service;
#endif
    Preloader* mPreloader;
    bool mPreloadDirectionIsForward;
#ifdef KIPI_FOUND
    KIPIInterface* mKIPIInterface;
#endif

    QActionGroup* mViewModeActionGroup;
    KRecentFilesAction* mFileOpenRecentAction;
    QAction * mBrowseAction;
    QAction * mViewAction;
    QAction * mGoUpAction;
    QAction * mGoToPreviousAction;
    QAction * mGoToNextAction;
    QAction * mGoToFirstAction;
    QAction * mGoToLastAction;
    KToggleAction* mToggleSideBarAction;
    QAction* mFullScreenAction;
    QAction * mToggleSlideShowAction;
    KToggleAction* mShowMenuBarAction;
    KToggleAction* mShowStatusBarAction;
#ifdef KF5Purpose_FOUND
    Purpose::Menu* mShareMenu;
    KToolBarPopupAction* mShareAction;
#endif
#ifdef KIPI_FOUND
    KIPIExportAction* mKIPIExportAction;
#endif

    SortedDirModel* mDirModel;
    DocumentOnlyProxyModel* mThumbnailBarModel;
    KLinkItemSelectionModel* mThumbnailBarSelectionModel;
    ContextManager* mContextManager;

    MainWindowState mStateBeforeFullScreen;

    QString mCaption;

    MainPageId mCurrentMainPageId;

    QDateTime mFullScreenLeftAt;
    KNotificationRestrictions* mNotificationRestrictions;

    void setupContextManager()
    {
        mContextManager = new ContextManager(mDirModel, q);
        connect(mContextManager, &ContextManager::selectionChanged,
            q, &MainWindow::slotSelectionChanged);
        connect(mContextManager, &ContextManager::currentDirUrlChanged,
            q, &MainWindow::slotCurrentDirUrlChanged);
    }

    void setupWidgets()
    {
        mFullScreenContent = new FullScreenContent(q, mGvCore);
        connect(mContextManager, &ContextManager::currentUrlChanged, mFullScreenContent, &FullScreenContent::setCurrentUrl);

        mCentralSplitter = new Splitter(Qt::Horizontal, q);
        q->setCentralWidget(mCentralSplitter);

        // Left side of splitter
        mSideBar = new SideBar(mCentralSplitter);

        // Right side of splitter
        mContentWidget = new QWidget(mCentralSplitter);

        mSaveBar = new SaveBar(mContentWidget, q->actionCollection());
        connect(mContextManager, &ContextManager::currentUrlChanged, mSaveBar, &SaveBar::setCurrentUrl);
        mViewStackedWidget = new QStackedWidget(mContentWidget);
        QVBoxLayout* layout = new QVBoxLayout(mContentWidget);
        layout->addWidget(mSaveBar);
        layout->addWidget(mViewStackedWidget);
        layout->setContentsMargins(0, 0, 0, 0);
        layout->setSpacing(0);
        ////

        mStartSlideShowWhenDirListerCompleted = false;
        mSlideShow = new SlideShow(q);
        connect(mContextManager, &ContextManager::currentUrlChanged, mSlideShow, &SlideShow::setCurrentUrl);

        setupThumbnailView(mViewStackedWidget);
        setupViewMainPage(mViewStackedWidget);
        setupStartMainPage(mViewStackedWidget);
        mViewStackedWidget->addWidget(mBrowseMainPage);
        mViewStackedWidget->addWidget(mViewMainPage);
        mViewStackedWidget->addWidget(mStartMainPage);
        mViewStackedWidget->setCurrentWidget(mBrowseMainPage);

        mCentralSplitter->setStretchFactor(0, 0);
        mCentralSplitter->setStretchFactor(1, 1);
        mCentralSplitter->setChildrenCollapsible(false);

        mThumbnailView->setFocus();

        connect(mSaveBar, &SaveBar::requestSaveAll,
                mGvCore, &GvCore::saveAll);
        connect(mSaveBar, &SaveBar::goToUrl,
                q, &MainWindow::goToUrl);

        connect(mSlideShow, &SlideShow::goToUrl,
                q, &MainWindow::goToUrl);
    }

    void setupThumbnailView(QWidget* parent)
    {
        Q_ASSERT(mContextManager);
        mBrowseMainPage = new BrowseMainPage(parent, q->actionCollection(), mGvCore);

        mThumbnailView = mBrowseMainPage->thumbnailView();
        mThumbnailView->viewport()->installEventFilter(q);
        mThumbnailView->setSelectionModel(mContextManager->selectionModel());
        mUrlNavigator = mBrowseMainPage->urlNavigator();

        mDocumentInfoProvider = new DocumentInfoProvider(mDirModel);
        mThumbnailView->setDocumentInfoProvider(mDocumentInfoProvider);

        mThumbnailViewHelper = new ThumbnailViewHelper(mDirModel, q->actionCollection());
        connect(mContextManager, &ContextManager::currentDirUrlChanged,
            mThumbnailViewHelper, &ThumbnailViewHelper::setCurrentDirUrl);
        mThumbnailView->setThumbnailViewHelper(mThumbnailViewHelper);

        mThumbnailBarSelectionModel = new KLinkItemSelectionModel(mThumbnailBarModel, mContextManager->selectionModel(), q);

        // Connect thumbnail view
        connect(mThumbnailView, &ThumbnailView::indexActivated,
                q, &MainWindow::slotThumbnailViewIndexActivated);

        // Connect delegate
        QAbstractItemDelegate* delegate = mThumbnailView->itemDelegate();
        connect(delegate, SIGNAL(saveDocumentRequested(QUrl)),
                mGvCore, SLOT(save(QUrl)));
        connect(delegate, SIGNAL(rotateDocumentLeftRequested(QUrl)),
                mGvCore, SLOT(rotateLeft(QUrl)));
        connect(delegate, SIGNAL(rotateDocumentRightRequested(QUrl)),
                mGvCore, SLOT(rotateRight(QUrl)));
        connect(delegate, SIGNAL(showDocumentInFullScreenRequested(QUrl)),
                q, SLOT(showDocumentInFullScreen(QUrl)));
        connect(delegate, SIGNAL(setDocumentRatingRequested(QUrl,int)),
                mGvCore, SLOT(setRating(QUrl,int)));

        // Connect url navigator
        connect(mUrlNavigator, &KUrlNavigator::urlChanged,
                q, &MainWindow::openDirUrl);
    }

    void setupViewMainPage(QWidget* parent)
    {
        mViewMainPage = new ViewMainPage(parent, mSlideShow, q->actionCollection(), mGvCore);
        connect(mViewMainPage, &ViewMainPage::captionUpdateRequested,
                q, &MainWindow::slotUpdateCaption);
        connect(mViewMainPage, &ViewMainPage::completed,
                q, &MainWindow::slotPartCompleted);
        connect(mViewMainPage, &ViewMainPage::previousImageRequested,
                q, &MainWindow::goToPrevious);
        connect(mViewMainPage, &ViewMainPage::nextImageRequested,
                q, &MainWindow::goToNext);
        connect(mViewMainPage, &ViewMainPage::openUrlRequested,
                q, &MainWindow::openUrl);
        connect(mViewMainPage, &ViewMainPage::openDirUrlRequested,
                q, &MainWindow::openDirUrl);

        setupThumbnailBar(mViewMainPage->thumbnailBar());
    }

    void setupThumbnailBar(ThumbnailView* bar)
    {
        Q_ASSERT(mThumbnailBarModel);
        Q_ASSERT(mThumbnailBarSelectionModel);
        Q_ASSERT(mDocumentInfoProvider);
        Q_ASSERT(mThumbnailViewHelper);
        bar->setModel(mThumbnailBarModel);
        bar->setSelectionModel(mThumbnailBarSelectionModel);
        bar->setDocumentInfoProvider(mDocumentInfoProvider);
        bar->setThumbnailViewHelper(mThumbnailViewHelper);
    }

    void setupStartMainPage(QWidget* parent)
    {
        mStartMainPage = new StartMainPage(parent, mGvCore);
        connect(mStartMainPage, &StartMainPage::urlSelected,
                q, &MainWindow::slotStartMainPageUrlSelected);
        connect(mStartMainPage, &StartMainPage::recentFileRemoved, [this](const QUrl& url) {
            mFileOpenRecentAction->removeUrl(url);
        });
        connect(mStartMainPage, &StartMainPage::recentFilesCleared, [this]() {
            mFileOpenRecentAction->clear();
        });
    }

    void installDisabledActionShortcutMonitor(QAction* action, const char* slot)
    {
        DisabledActionShortcutMonitor* monitor = new DisabledActionShortcutMonitor(action, q);
        connect(monitor, SIGNAL(activated()), q, slot);
    }

    void setupActions()
    {
        KActionCollection* actionCollection = q->actionCollection();
        KActionCategory* file = new KActionCategory(i18nc("@title actions category", "File"), actionCollection);
        KActionCategory* view = new KActionCategory(i18nc("@title actions category - means actions changing smth in interface", "View"), actionCollection);

        file->addAction(KStandardAction::Save, q, SLOT(saveCurrent()));
        file->addAction(KStandardAction::SaveAs, q, SLOT(saveCurrentAs()));
        file->addAction(KStandardAction::Open, q, SLOT(openFile()));
        mFileOpenRecentAction = KStandardAction::openRecent(q, SLOT(openUrl(QUrl)), q);
        connect(mFileOpenRecentAction, &KRecentFilesAction::recentListCleared,
                mGvCore, &GvCore::clearRecentFilesAndFolders);
        QAction * clearAction = mFileOpenRecentAction->menu()->findChild<QAction*>("clear_action");
        if (clearAction) {
            clearAction->setText(i18nc("@action Open Recent menu", "Forget All Files && Folders"));
        }
        file->addAction("file_open_recent", mFileOpenRecentAction);
        file->addAction(KStandardAction::Print, q, SLOT(print()));
        file->addAction(KStandardAction::Quit, qApp, SLOT(closeAllWindows()));

        QAction * action = file->addAction("reload", q, SLOT(reload()));
        action->setText(i18nc("@action reload the currently viewed image", "Reload"));
        action->setIcon(QIcon::fromTheme("view-refresh"));
        actionCollection->setDefaultShortcuts(action, KStandardShortcut::reload());
        
        QAction * replaceLocationAction = actionCollection->addAction(QStringLiteral("replace_location"));
        replaceLocationAction->setText(i18nc("@action:inmenu Navigation Bar", "Replace Location"));
        actionCollection->setDefaultShortcut(replaceLocationAction, Qt::CTRL + Qt::Key_L);
        connect(replaceLocationAction, &QAction::triggered, q, &MainWindow::replaceLocation);

        mBrowseAction = view->addAction("browse");
        mBrowseAction->setText(i18nc("@action:intoolbar Switch to file list", "Browse"));
        mBrowseAction->setToolTip(i18nc("@info:tooltip", "Browse folders for images"));
        mBrowseAction->setCheckable(true);
        mBrowseAction->setIcon(QIcon::fromTheme("view-list-icons"));
        actionCollection->setDefaultShortcut(mBrowseAction, Qt::Key_Escape);
        connect(mViewMainPage, &ViewMainPage::goToBrowseModeRequested,
            mBrowseAction, &QAction::trigger);

        mViewAction = view->addAction("view");
        mViewAction->setText(i18nc("@action:intoolbar Switch to image view", "View"));
        mViewAction->setToolTip(i18nc("@info:tooltip", "View selected images"));
        mViewAction->setIcon(QIcon::fromTheme("view-preview"));
        mViewAction->setCheckable(true);

        mViewModeActionGroup = new QActionGroup(q);
        mViewModeActionGroup->addAction(mBrowseAction);
        mViewModeActionGroup->addAction(mViewAction);

        connect(mViewModeActionGroup, &QActionGroup::triggered,
                q, &MainWindow::setActiveViewModeAction);

        mFullScreenAction = KStandardAction::fullScreen(q, &MainWindow::toggleFullScreen, q, actionCollection);
        QList<QKeySequence> shortcuts = mFullScreenAction->shortcuts();
        shortcuts.append(QKeySequence(Qt::Key_F11));
        actionCollection->setDefaultShortcuts(mFullScreenAction, shortcuts);

        connect(mViewMainPage, &ViewMainPage::toggleFullScreenRequested,
                mFullScreenAction, &QAction::trigger);

        QAction * leaveFullScreenAction = view->addAction("leave_fullscreen", q, SLOT(leaveFullScreen()));
        leaveFullScreenAction->setIcon(QIcon::fromTheme("view-restore"));
        leaveFullScreenAction->setText(i18nc("@action", "Exit Full Screen"));

        mGoToPreviousAction = view->addAction("go_previous", q, SLOT(goToPrevious()));
        mGoToPreviousAction->setPriority(QAction::LowPriority);
        mGoToPreviousAction->setIcon(QIcon::fromTheme("go-previous-view"));
        mGoToPreviousAction->setText(i18nc("@action Go to previous image", "Previous"));
        mGoToPreviousAction->setToolTip(i18nc("@info:tooltip", "Go to previous image"));
        actionCollection->setDefaultShortcut(mGoToPreviousAction, Qt::Key_Backspace);
        installDisabledActionShortcutMonitor(mGoToPreviousAction, SLOT(showFirstDocumentReached()));

        mGoToNextAction = view->addAction("go_next", q, SLOT(goToNext()));
        mGoToNextAction->setPriority(QAction::LowPriority);
        mGoToNextAction->setIcon(QIcon::fromTheme("go-next-view"));
        mGoToNextAction->setText(i18nc("@action Go to next image", "Next"));
        mGoToNextAction->setToolTip(i18nc("@info:tooltip", "Go to next image"));
        actionCollection->setDefaultShortcut(mGoToNextAction, Qt::Key_Space);
        installDisabledActionShortcutMonitor(mGoToNextAction, SLOT(showLastDocumentReached()));

        mGoToFirstAction = view->addAction("go_first", q, SLOT(goToFirst()));
        mGoToFirstAction->setPriority(QAction::LowPriority);
        mGoToFirstAction->setIcon(QIcon::fromTheme("go-first-view"));
        mGoToFirstAction->setText(i18nc("@action Go to first image", "First"));
        mGoToFirstAction->setToolTip(i18nc("@info:tooltip", "Go to first image"));
        actionCollection->setDefaultShortcut(mGoToFirstAction, Qt::Key_Home);

        mGoToLastAction = view->addAction("go_last", q, SLOT(goToLast()));
        mGoToLastAction->setPriority(QAction::LowPriority);
        mGoToLastAction->setIcon(QIcon::fromTheme("go-last-view"));
        mGoToLastAction->setText(i18nc("@action Go to last image", "Last"));
        mGoToLastAction->setToolTip(i18nc("@info:tooltip", "Go to last image"));
        actionCollection->setDefaultShortcut(mGoToLastAction, Qt::Key_End);

        mPreloadDirectionIsForward = true;

        mGoUpAction = view->addAction(KStandardAction::Up, q, SLOT(goUp()));

        action = view->addAction("go_start_page", q, SLOT(showStartMainPage()));
        action->setPriority(QAction::LowPriority);
        action->setIcon(QIcon::fromTheme("go-home"));
        action->setText(i18nc("@action", "Start Page"));
        action->setToolTip(i18nc("@info:tooltip", "Open the start page"));
        actionCollection->setDefaultShortcuts(action, KStandardShortcut::home());

        mToggleSideBarAction = view->add<KToggleAction>("toggle_sidebar");
        connect(mToggleSideBarAction, &KToggleAction::triggered, q, &MainWindow::toggleSideBar);
        mToggleSideBarAction->setIcon(QIcon::fromTheme("view-sidetree"));
        actionCollection->setDefaultShortcut(mToggleSideBarAction, Qt::Key_F4);
        mToggleSideBarAction->setText(i18nc("@action", "Sidebar"));
        connect(mBrowseMainPage->toggleSideBarButton(), &QAbstractButton::clicked,
                mToggleSideBarAction, &QAction::trigger);
        connect(mViewMainPage->toggleSideBarButton(), &QAbstractButton::clicked,
                mToggleSideBarAction, &QAction::trigger);

        mToggleSlideShowAction = view->addAction("toggle_slideshow", q, SLOT(toggleSlideShow()));
        q->updateSlideShowAction();
        connect(mSlideShow, &SlideShow::stateChanged,
                q, &MainWindow::updateSlideShowAction);

        q->setStandardToolBarMenuEnabled(true);

        mShowMenuBarAction = static_cast<KToggleAction*>(view->addAction(KStandardAction::ShowMenubar, q, SLOT(toggleMenuBar())));
        mShowStatusBarAction = static_cast<KToggleAction*>(view->addAction(KStandardAction::ShowStatusbar, q, SLOT(toggleStatusBar(bool))));

        actionCollection->setDefaultShortcut(mShowStatusBarAction, Qt::Key_F3);

        view->addAction(KStandardAction::name(KStandardAction::KeyBindings),
                        KStandardAction::keyBindings(q, &MainWindow::configureShortcuts, actionCollection));

        view->addAction(KStandardAction::Preferences, q,
                        SLOT(showConfigDialog()));

        view->addAction(KStandardAction::ConfigureToolbars, q,
                        SLOT(configureToolbars()));

#ifdef KIPI_FOUND
        mKIPIExportAction = new KIPIExportAction(q);
#endif

#ifdef KF5Purpose_FOUND
        mShareAction = new KToolBarPopupAction(QIcon::fromTheme("document-share"), i18nc("@action Share images", "Share"), q);
        mShareAction->setDelayed(false);
        actionCollection->addAction("share", mShareAction);
        mShareMenu = new Purpose::Menu(q);
        mShareAction->setMenu(mShareMenu);
#endif
    }

    void setupUndoActions()
    {
        // There is no KUndoGroup similar to KUndoStack. This code basically
        // does the same as KUndoStack, but for the KUndoGroup actions.
        QUndoGroup* undoGroup = DocumentFactory::instance()->undoGroup();
        QAction* action;
        KActionCollection* actionCollection =  q->actionCollection();
        KActionCategory* edit = new KActionCategory(i18nc("@title actions category - means actions changing smth in interface", "Edit"), actionCollection);

        action = undoGroup->createRedoAction(actionCollection);
        action->setObjectName(KStandardAction::name(KStandardAction::Redo));
        action->setIcon(QIcon::fromTheme("edit-redo"));
        action->setIconText(i18n("Redo"));
        actionCollection->setDefaultShortcuts(action, KStandardShortcut::redo());

        edit->addAction(action->objectName(), action);

        action = undoGroup->createUndoAction(actionCollection);
        action->setObjectName(KStandardAction::name(KStandardAction::Undo));
        action->setIcon(QIcon::fromTheme("edit-undo"));
        action->setIconText(i18n("Undo"));
        actionCollection->setDefaultShortcuts(action, KStandardShortcut::undo());
        edit->addAction(action->objectName(), action);
    }

    void setupContextManagerItems()
    {
        Q_ASSERT(mContextManager);
        KActionCollection* actionCollection = q->actionCollection();

        // Create context manager items
        FolderViewContextManagerItem* folderViewItem = new FolderViewContextManagerItem(mContextManager);
        connect(folderViewItem, &FolderViewContextManagerItem::urlChanged,
                q, &MainWindow::folderViewUrlChanged);

        InfoContextManagerItem* infoItem = new InfoContextManagerItem(mContextManager);

#ifndef GWENVIEW_SEMANTICINFO_BACKEND_NONE
        SemanticInfoContextManagerItem* semanticInfoItem = nullptr;
        semanticInfoItem = new SemanticInfoContextManagerItem(mContextManager, actionCollection, mViewMainPage);
#endif

        ImageOpsContextManagerItem* imageOpsItem =
            new ImageOpsContextManagerItem(mContextManager, q);

        FileOpsContextManagerItem* fileOpsItem = new FileOpsContextManagerItem(mContextManager, mThumbnailView, actionCollection, q);

        // Fill sidebar
        SideBarPage* page;
        page = new SideBarPage(i18n("Folders"));
        page->setObjectName(QLatin1String("folders"));
        page->addWidget(folderViewItem->widget());
        page->layout()->setContentsMargins(0, 0, 0, 0);
        mSideBar->addPage(page);

        page = new SideBarPage(i18n("Information"));
        page->setObjectName(QLatin1String("information"));
        page->addWidget(infoItem->widget());
#ifndef GWENVIEW_SEMANTICINFO_BACKEND_NONE
        if (semanticInfoItem) {
            page->addWidget(semanticInfoItem->widget());
        }
#endif
        mSideBar->addPage(page);

        page = new SideBarPage(i18n("Operations"));
        page->setObjectName(QLatin1String("operations"));
        page->addWidget(imageOpsItem->widget());
        page->addWidget(fileOpsItem->widget());
        page->addStretch();
        mSideBar->addPage(page);
    }

    void initDirModel()
    {
        mDirModel->setKindFilter(
            MimeTypeUtils::KIND_DIR
            | MimeTypeUtils::KIND_ARCHIVE
            | MimeTypeUtils::KIND_RASTER_IMAGE
            | MimeTypeUtils::KIND_SVG_IMAGE
            | MimeTypeUtils::KIND_VIDEO);

        connect(mDirModel, &QAbstractItemModel::rowsInserted,
                q, &MainWindow::slotDirModelNewItems);

        connect(mDirModel, &QAbstractItemModel::rowsRemoved,
                q, &MainWindow::updatePreviousNextActions);
        connect(mDirModel, &QAbstractItemModel::modelReset,
                q, &MainWindow::updatePreviousNextActions);

        connect(mDirModel->dirLister(), SIGNAL(completed()),
                q, SLOT(slotDirListerCompleted()));
    }

    void setupThumbnailBarModel()
    {
        mThumbnailBarModel = new DocumentOnlyProxyModel(q);
        mThumbnailBarModel->setSourceModel(mDirModel);
    }

    bool indexIsDirOrArchive(const QModelIndex& index) const
    {
        Q_ASSERT(index.isValid());
        KFileItem item = mDirModel->itemForIndex(index);
        return ArchiveUtils::fileItemIsDirOrArchive(item);
    }

    void goTo(const QModelIndex& index)
    {
        if (!index.isValid()) {
            return;
        }
        mThumbnailView->setCurrentIndex(index);
        mThumbnailView->scrollTo(index);
    }

    void goTo(int offset)
    {
        mPreloadDirectionIsForward = offset > 0;
        QModelIndex index = mContextManager->selectionModel()->currentIndex();
        index = mDirModel->index(index.row() + offset, 0);
        if (index.isValid() && !indexIsDirOrArchive(index)) {
            goTo(index);
        }
    }

    void goToFirstDocument()
    {
        QModelIndex index;
        for (int row = 0;; ++row) {
            index = mDirModel->index(row, 0);
            if (!index.isValid()) {
                return;
            }

            if (!indexIsDirOrArchive(index)) {
                break;
            }
        }
        goTo(index);
    }

    void goToLastDocument()
    {
        QModelIndex index = mDirModel->index(mDirModel->rowCount() - 1, 0);
        goTo(index);
    }

    void setupFullScreenContent()
    {
        mFullScreenContent->init(q->actionCollection(), mViewMainPage, mSlideShow);
        setupThumbnailBar(mFullScreenContent->thumbnailBar());
    }

    inline void setActionEnabled(const char* name, bool enabled)
    {
        QAction* action = q->actionCollection()->action(name);
        if (action) {
            action->setEnabled(enabled);
        } else {
            qCWarning(GWENVIEW_APP_LOG) << "Action" << name << "not found";
        }
    }

    void setActionsDisabledOnStartMainPageEnabled(bool enabled)
    {
        mBrowseAction->setEnabled(enabled);
        mViewAction->setEnabled(enabled);
        mToggleSideBarAction->setEnabled(enabled);
        mShowStatusBarAction->setEnabled(enabled);
        mFullScreenAction->setEnabled(enabled);
        mToggleSlideShowAction->setEnabled(enabled);

        setActionEnabled("reload", enabled);
        setActionEnabled("go_start_page", enabled);
        setActionEnabled("add_folder_to_places", enabled);
    }

    void updateActions()
    {
        bool isRasterImage = false;
        bool canSave = false;
        bool isModified = false;
        const QUrl url = mContextManager->currentUrl();

        if (url.isValid()) {
            isRasterImage = mContextManager->currentUrlIsRasterImage();
            canSave = isRasterImage;
            isModified = DocumentFactory::instance()->load(url)->isModified();
            if (mCurrentMainPageId != ViewMainPageId
                    && mContextManager->selectedFileItemList().count() != 1) {
                // Saving only makes sense if exactly one image is selected
                canSave = false;
            }
        }

        KActionCollection* actionCollection = q->actionCollection();
        actionCollection->action("file_save")->setEnabled(canSave && isModified);
        actionCollection->action("file_save_as")->setEnabled(canSave);
        actionCollection->action("file_print")->setEnabled(isRasterImage);

#ifdef KF5Purpose_FOUND
        if (url.isEmpty()) {
            mShareAction->setEnabled(false);
        } else {
            mShareAction->setEnabled(true);
            mShareMenu->model()->setInputData(QJsonObject{
                { QStringLiteral("mimeType"), MimeTypeUtils::urlMimeType(url) },
                { QStringLiteral("urls"), QJsonArray{url.toString()} }
            });
            mShareMenu->model()->setPluginType( QStringLiteral("Export") );
            mShareMenu->reload();
        }
#endif
    }

    bool sideBarVisibility() const
    {
        switch (mCurrentMainPageId) {
        case StartMainPageId:
            GV_WARN_AND_RETURN_VALUE(false, "Sidebar not implemented on start page");
            break;
        case BrowseMainPageId:
            return GwenviewConfig::sideBarVisibleBrowseMode();
        case ViewMainPageId:
            return q->isFullScreen()
                ? GwenviewConfig::sideBarVisibleViewModeFullScreen()
                : GwenviewConfig::sideBarVisibleViewMode();
        }
        return false;
    }

    void saveSideBarVisibility(const bool visible)
    {
        switch (mCurrentMainPageId) {
        case StartMainPageId:
            GV_WARN_AND_RETURN("Sidebar not implemented on start page");
            break;
        case BrowseMainPageId:
            GwenviewConfig::setSideBarVisibleBrowseMode(visible);
            break;
        case ViewMainPageId:
            q->isFullScreen()
                ? GwenviewConfig::setSideBarVisibleViewModeFullScreen(visible)
                : GwenviewConfig::setSideBarVisibleViewMode(visible);
            break;
        }
    }

    bool statusBarVisibility() const
    {
        switch (mCurrentMainPageId) {
        case StartMainPageId:
            GV_WARN_AND_RETURN_VALUE(false, "Statusbar not implemented on start page");
            break;
        case BrowseMainPageId:
            return GwenviewConfig::statusBarVisibleBrowseMode();
        case ViewMainPageId:
            return q->isFullScreen()
                ? GwenviewConfig::statusBarVisibleViewModeFullScreen()
                : GwenviewConfig::statusBarVisibleViewMode();
        }
        return false;
    }

    void saveStatusBarVisibility(const bool visible)
    {
        switch (mCurrentMainPageId) {
        case StartMainPageId:
            GV_WARN_AND_RETURN("Statusbar not implemented on start page");
            break;
        case BrowseMainPageId:
            GwenviewConfig::setStatusBarVisibleBrowseMode(visible);
            break;
        case ViewMainPageId:
            q->isFullScreen()
                ? GwenviewConfig::setStatusBarVisibleViewModeFullScreen(visible)
                : GwenviewConfig::setStatusBarVisibleViewMode(visible);
            break;
        }
    }

    void loadSplitterConfig()
    {
        const QList<int> sizes = GwenviewConfig::sideBarSplitterSizes();
        if (!sizes.isEmpty()) {
            mCentralSplitter->setSizes(sizes);
        }
    }

    void saveSplitterConfig()
    {
        if (mSideBar->isVisible()) {
            GwenviewConfig::setSideBarSplitterSizes(mCentralSplitter->sizes());
        }
    }

    void setScreenSaverEnabled(bool enabled)
    {
        // Always delete mNotificationRestrictions, it does not hurt
        delete mNotificationRestrictions;
        if (!enabled) {
            mNotificationRestrictions = new KNotificationRestrictions(KNotificationRestrictions::ScreenSaver, q);
        } else {
            mNotificationRestrictions = nullptr;
        }
    }

    void assignThumbnailProviderToThumbnailView(ThumbnailView* thumbnailView)
    {
        GV_RETURN_IF_FAIL(thumbnailView);
        if (mActiveThumbnailView) {
            mActiveThumbnailView->setThumbnailProvider(nullptr);
        }
        thumbnailView->setThumbnailProvider(mThumbnailProvider);
        mActiveThumbnailView = thumbnailView;
        if (mActiveThumbnailView->isVisible()) {
            mThumbnailProvider->stop();
            mActiveThumbnailView->generateThumbnailsForItems();
        }
    }

    void autoAssignThumbnailProvider()
    {
        if (mCurrentMainPageId == ViewMainPageId) {
            if (q->windowState() & Qt::WindowFullScreen) {
                assignThumbnailProviderToThumbnailView(mFullScreenContent->thumbnailBar());
            } else {
                assignThumbnailProviderToThumbnailView(mViewMainPage->thumbnailBar());
            }
        } else if (mCurrentMainPageId == BrowseMainPageId) {
            assignThumbnailProviderToThumbnailView(mThumbnailView);
        } else if (mCurrentMainPageId == StartMainPageId) {
            assignThumbnailProviderToThumbnailView(mStartMainPage->recentFoldersView());
        }
    }
};

MainWindow::MainWindow()
: KXmlGuiWindow(),
      d(new MainWindow::Private)
{
    d->q = this;
    d->mCurrentMainPageId = StartMainPageId;
    d->mDirModel = new SortedDirModel(this);
    d->setupContextManager();
    d->setupThumbnailBarModel();
    d->mGvCore = new GvCore(this, d->mDirModel);
    d->mPreloader = new Preloader(this);
    d->mNotificationRestrictions = nullptr;
    d->mThumbnailProvider = new ThumbnailProvider();
    d->mActiveThumbnailView = nullptr;
    d->initDirModel();
    d->setupWidgets();
    d->setupActions();
    d->setupUndoActions();
    d->setupContextManagerItems();
    d->setupFullScreenContent();

    d->updateActions();
    updatePreviousNextActions();
    d->mSaveBar->initActionDependentWidgets();

    createGUI();
    loadConfig();

    connect(DocumentFactory::instance(), &DocumentFactory::modifiedDocumentListChanged,
            this, &MainWindow::slotModifiedDocumentListChanged);

#ifdef HAVE_QTDBUS
    d->mMpris2Service = new Mpris2Service(d->mSlideShow, d->mContextManager,
                                          d->mToggleSlideShowAction, d->mFullScreenAction,
                                          d->mGoToPreviousAction, d->mGoToNextAction, this);
#endif


    auto* ratingMenu = static_cast<QMenu*>(guiFactory()->container("rating", this));
    ratingMenu->setIcon(QIcon::fromTheme(QStringLiteral("rating-unrated")));
#ifdef GWENVIEW_SEMANTICINFO_BACKEND_NONE
    if (ratingMenu) {
        ratingMenu->menuAction()->setVisible(false);
    }
#endif

#ifdef KIPI_FOUND
    d->mKIPIInterface = new KIPIInterface(this);
    d->mKIPIExportAction->setKIPIInterface(d->mKIPIInterface);
#else
    auto* pluginsMenu = static_cast<QMenu*>(guiFactory()->container("plugins", this));
    if (pluginsMenu) {
        pluginsMenu->menuAction()->setVisible(false);
    }
#endif
    setAutoSaveSettings();
#ifdef Q_OS_OSX
    qApp->installEventFilter(this);
#endif
}

MainWindow::~MainWindow()
{
    if (GwenviewConfig::lowResourceUsageMode()) {
        QDir dir(ThumbnailProvider::thumbnailBaseDir());
        if (dir.exists()) {
            dir.removeRecursively();
        }
    }
    delete d->mThumbnailProvider;
    delete d;
}

ContextManager* MainWindow::contextManager() const
{
    return d->mContextManager;
}

ViewMainPage* MainWindow::viewMainPage() const
{
    return d->mViewMainPage;
}

void MainWindow::setCaption(const QString& caption)
{
    // Keep a trace of caption to use it in slotModifiedDocumentListChanged()
    d->mCaption = caption;
    KXmlGuiWindow::setCaption(caption);
}

void MainWindow::setCaption(const QString& caption, bool modified)
{
    d->mCaption = caption;
    KXmlGuiWindow::setCaption(caption, modified);
}

void MainWindow::slotUpdateCaption(const QString& caption)
{
    const QUrl url = d->mContextManager->currentUrl();
    const QList<QUrl> list = DocumentFactory::instance()->modifiedDocumentList();
    setCaption(caption, list.contains(url));
}

void MainWindow::slotModifiedDocumentListChanged()
{
    d->updateActions();
    slotUpdateCaption(d->mCaption);
}

void MainWindow::setInitialUrl(const QUrl &_url)
{
    Q_ASSERT(_url.isValid());
    QUrl url = UrlUtils::fixUserEnteredUrl(_url);
    if (UrlUtils::urlIsDirectory(url)) {
        d->mBrowseAction->trigger();
        openDirUrl(url);
    } else {
        openUrl(url);
    }
}

void MainWindow::startSlideShow()
{
    d->mViewAction->trigger();
    // We need to wait until we have listed all images in the dirlister to
    // start the slideshow because the SlideShow objects needs an image list to
    // work.
    d->mStartSlideShowWhenDirListerCompleted = true;
}

void MainWindow::setActiveViewModeAction(QAction* action)
{
    if (action == d->mViewAction) {
        d->mCurrentMainPageId = ViewMainPageId;
        // Switching to view mode
        d->mViewStackedWidget->setCurrentWidget(d->mViewMainPage);
        openSelectedDocuments();
        d->mPreloadDirectionIsForward = true;
        QTimer::singleShot(VIEW_PRELOAD_DELAY, this, &MainWindow::preloadNextUrl);
    } else {
        d->mCurrentMainPageId = BrowseMainPageId;
        // Switching to browse mode
        d->mViewStackedWidget->setCurrentWidget(d->mBrowseMainPage);
        if (!d->mViewMainPage->isEmpty()
                && KProtocolManager::supportsListing(d->mViewMainPage->url())) {
            // Reset the view to spare resources, but don't do it if we can't
            // browse the url, otherwise if the user starts Gwenview this way:
            // gwenview http://example.com/example.png
            // and switch to browse mode, switching back to view mode won't bring
            // his image back.
            d->mViewMainPage->reset();
        }
        setCaption(QString());
    }
    d->autoAssignThumbnailProvider();
    toggleSideBar(d->sideBarVisibility()); 
    toggleStatusBar(d->statusBarVisibility());

    emit viewModeChanged();
}

void MainWindow::slotThumbnailViewIndexActivated(const QModelIndex& index)
{
    if (!index.isValid()) {
        return;
    }

    KFileItem item = d->mDirModel->itemForIndex(index);
    if (item.isDir()) {
        // Item is a dir, open it
        openDirUrl(item.url());
    } else {
        QString protocol = ArchiveUtils::protocolForMimeType(item.mimetype());
        if (!protocol.isEmpty()) {
            // Item is an archive, tweak url then open it
            QUrl url = item.url();
            url.setScheme(protocol);
            openDirUrl(url);
        } else {
            // Item is a document, switch to view mode
            d->mViewAction->trigger();
        }
    }
}

void MainWindow::openSelectedDocuments()
{
    if (d->mCurrentMainPageId != ViewMainPageId) {
        return;
    }

    int count = 0;
    QList<QUrl> urls;
    const auto list = d->mContextManager->selectedFileItemList();
    for (const auto &item : list) {
        if (!item.isNull() && !ArchiveUtils::fileItemIsDirOrArchive(item)) {
            urls << item.url();

            ++count;
            if (count == ViewMainPage::MaxViewCount) {
                break;
            }
        }
    }

    if (urls.isEmpty()) {
        // Selection contains no fitting items
        // Switch back to browsing mode
        d->mBrowseAction->trigger();
        d->mViewMainPage->reset();
        return;
    }

    QUrl currentUrl = d->mContextManager->currentUrl();
    if (currentUrl.isEmpty() || !urls.contains(currentUrl)) {
        // There is no current URL or it doesn't belong to selection
        // This can happen when user manually selects a group of items
        currentUrl = urls.first();
    }

    d->mViewMainPage->openUrls(urls, currentUrl);
}

void MainWindow::goUp()
{
    if (d->mCurrentMainPageId == BrowseMainPageId) {
        QUrl url = d->mContextManager->currentDirUrl();
        url = KIO::upUrl(url);
        openDirUrl(url);
    } else {
        d->mBrowseAction->trigger();
    }
}

void MainWindow::showStartMainPage()
{
    d->mCurrentMainPageId = StartMainPageId;
    d->setActionsDisabledOnStartMainPageEnabled(false);

    d->saveSplitterConfig();
    d->mSideBar->hide();
    d->mViewStackedWidget->setCurrentWidget(d->mStartMainPage);

    d->updateActions();
    updatePreviousNextActions();
    d->mContextManager->setCurrentDirUrl(QUrl());
    d->mContextManager->setCurrentUrl(QUrl());

    d->autoAssignThumbnailProvider();
}

void MainWindow::slotStartMainPageUrlSelected(const QUrl &url)
{
    d->setActionsDisabledOnStartMainPageEnabled(true);

    if (d->mBrowseAction->isChecked()) {
        // Silently uncheck the action so that setInitialUrl() does the right thing
        SignalBlocker blocker(d->mBrowseAction);
        d->mBrowseAction->setChecked(false);
    }

    setInitialUrl(url);
}

void MainWindow::openDirUrl(const QUrl &url)
{
    const QUrl currentUrl = d->mContextManager->currentDirUrl();

    if (url == currentUrl) {
        return;
    }

    if (url.isParentOf(currentUrl)) {
        // Keep first child between url and currentUrl selected
        // If currentPath is      "/home/user/photos/2008/event"
        // and wantedPath is      "/home/user/photos"
        // pathToSelect should be "/home/user/photos/2008"

        // To anyone considering using QUrl::toLocalFile() instead of
        // QUrl::path() here. Please don't, using QUrl::path() is the right
        // thing to do here.
        const QString currentPath = QDir::cleanPath(currentUrl.adjusted(QUrl::StripTrailingSlash).path());
        const QString wantedPath  = QDir::cleanPath(url.adjusted(QUrl::StripTrailingSlash).path());
        const QChar separator('/');
        const int slashCount = wantedPath.count(separator);
        const QString pathToSelect = currentPath.section(separator, 0, slashCount + 1);
        QUrl urlToSelect = url;
        urlToSelect.setPath(pathToSelect);
        d->mContextManager->setUrlToSelect(urlToSelect);
    }
    d->mThumbnailProvider->stop();
    d->mContextManager->setCurrentDirUrl(url);
    d->mGvCore->addUrlToRecentFolders(url);
    d->mViewMainPage->reset();
}

void MainWindow::folderViewUrlChanged(const QUrl &url) {
    const QUrl currentUrl = d->mContextManager->currentDirUrl();

    if (url == currentUrl) {
        switch (d->mCurrentMainPageId) {
        case ViewMainPageId:
            d->mBrowseAction->trigger();
            break;
        case BrowseMainPageId:
            d->mViewAction->trigger();
            break;
        case StartMainPageId:
            break;
        }
    } else {
        openDirUrl(url);
    }
}

void MainWindow::toggleSideBar(bool visible)
{
    d->saveSplitterConfig();
    d->mToggleSideBarAction->setChecked(visible);
    d->saveSideBarVisibility(visible);
    d->mSideBar->setVisible(visible);

    const QString text = QApplication::isRightToLeft()
        ? QString::fromUtf8(visible ? "▮→" : "▮←")
        : QString::fromUtf8(visible ? "▮←" : "▮→");
    const QString toolTip = visible
        ? i18nc("@info:tooltip", "Hide sidebar")
        : i18nc("@info:tooltip", "Show sidebar");

    const QList<QToolButton*> buttonList {
        d->mBrowseMainPage->toggleSideBarButton(),
        d->mViewMainPage->toggleSideBarButton()
    };
    for (auto button : buttonList) {
        button->setText(text);
        button->setToolTip(toolTip);
    }
}

void MainWindow::toggleStatusBar(bool visible)
{
    d->mShowStatusBarAction->setChecked(visible);
    d->saveStatusBarVisibility(visible);

    d->mViewMainPage->setStatusBarVisible(visible);
    d->mBrowseMainPage->setStatusBarVisible(visible);
}

void MainWindow::slotPartCompleted()
{
    d->updateActions();
    const QUrl url = d->mContextManager->currentUrl();
    if (!url.isEmpty() && GwenviewConfig::historyEnabled()) {
        d->mFileOpenRecentAction->addUrl(url);
        d->mGvCore->addUrlToRecentFiles(url);
    }

    if (KProtocolManager::supportsListing(url)) {
        const QUrl dirUrl = d->mContextManager->currentDirUrl();
        d->mGvCore->addUrlToRecentFolders(dirUrl);
    }
}

void MainWindow::slotSelectionChanged()
{
    if (d->mCurrentMainPageId == ViewMainPageId) {
        // The user selected a new file in the thumbnail view, since the
        // document view is visible, let's show it
        openSelectedDocuments();
    } else {
        // No document view, we need to load the document to set the undo group
        // of document factory to the correct QUndoStack
        QModelIndex index = d->mThumbnailView->currentIndex();
        KFileItem item;
        if (index.isValid()) {
            item = d->mDirModel->itemForIndex(index);
        }
        QUndoGroup* undoGroup = DocumentFactory::instance()->undoGroup();
        if (!item.isNull() && !ArchiveUtils::fileItemIsDirOrArchive(item)) {
            QUrl url = item.url();
            Document::Ptr doc = DocumentFactory::instance()->load(url);
            undoGroup->addStack(doc->undoStack());
            undoGroup->setActiveStack(doc->undoStack());
        } else {
            undoGroup->setActiveStack(nullptr);
        }
    }

    // Update UI
    d->updateActions();
    updatePreviousNextActions();

    // Start preloading
    int preloadDelay = d->mCurrentMainPageId == ViewMainPageId ? VIEW_PRELOAD_DELAY : BROWSE_PRELOAD_DELAY;
    QTimer::singleShot(preloadDelay, this, &MainWindow::preloadNextUrl);
}

void MainWindow::slotCurrentDirUrlChanged(const QUrl &url)
{
    if (url.isValid()) {
        d->mUrlNavigator->setLocationUrl(url);
        d->mGoUpAction->setEnabled(url.path() != "/");
    } else {
        d->mGoUpAction->setEnabled(false);
    }
}

void MainWindow::slotDirModelNewItems()
{
    if (d->mContextManager->selectionModel()->hasSelection()) {
        updatePreviousNextActions();
    }
}

void MainWindow::slotDirListerCompleted()
{
    if (d->mStartSlideShowWhenDirListerCompleted) {
        d->mStartSlideShowWhenDirListerCompleted = false;
        QTimer::singleShot(0, d->mToggleSlideShowAction, &QAction::trigger);
    }
    if (d->mContextManager->selectionModel()->hasSelection()) {
        updatePreviousNextActions();
    } else {
        d->goToFirstDocument();

        // Try to select the first directory in case there are no images to select
        if (!d->mContextManager->selectionModel()->hasSelection()) {
            const QModelIndex index = d->mThumbnailView->model()->index(0, 0);
            if (index.isValid()) {
                d->mThumbnailView->setCurrentIndex(index);
            }
        }
    }
    d->mThumbnailView->scrollToSelectedIndex();
    d->mViewMainPage->thumbnailBar()->scrollToSelectedIndex();
    d->mFullScreenContent->thumbnailBar()->scrollToSelectedIndex();
}

void MainWindow::goToPrevious()
{
    d->goTo(-1);
}

void MainWindow::goToNext()
{
    d->goTo(1);
}

void MainWindow::goToFirst()
{
    d->goToFirstDocument();
}

void MainWindow::goToLast()
{
    d->goToLastDocument();
}

void MainWindow::goToUrl(const QUrl &url)
{
    if (d->mCurrentMainPageId == ViewMainPageId) {
        d->mViewMainPage->openUrl(url);
    }
    QUrl dirUrl = url;
    dirUrl = dirUrl.adjusted(QUrl::RemoveFilename);
    if (dirUrl != d->mContextManager->currentDirUrl()) {
        d->mContextManager->setCurrentDirUrl(dirUrl);
        d->mGvCore->addUrlToRecentFolders(dirUrl);
    }
    d->mContextManager->setUrlToSelect(url);
}

void MainWindow::updatePreviousNextActions()
{
    bool hasPrevious;
    bool hasNext;
    QModelIndex currentIndex = d->mContextManager->selectionModel()->currentIndex();
    if (currentIndex.isValid() && !d->indexIsDirOrArchive(currentIndex)) {
        int row = currentIndex.row();
        QModelIndex prevIndex = d->mDirModel->index(row - 1, 0);
        QModelIndex nextIndex = d->mDirModel->index(row + 1, 0);
        hasPrevious = prevIndex.isValid() && !d->indexIsDirOrArchive(prevIndex);
        hasNext = nextIndex.isValid() && !d->indexIsDirOrArchive(nextIndex);
    } else {
        hasPrevious = false;
        hasNext = false;
    }

    d->mGoToPreviousAction->setEnabled(hasPrevious);
    d->mGoToNextAction->setEnabled(hasNext);
    d->mGoToFirstAction->setEnabled(hasPrevious);
    d->mGoToLastAction->setEnabled(hasNext);
}

void MainWindow::leaveFullScreen()
{
    if (d->mFullScreenAction->isChecked()) {
        d->mFullScreenAction->trigger();
    }
}

void MainWindow::toggleFullScreen(bool checked)
{
    setUpdatesEnabled(false);
    if (checked) {
        // Save MainWindow config now, this way if we quit while in
        // fullscreen, we are sure latest MainWindow changes are remembered.
        KConfigGroup saveConfigGroup = autoSaveConfigGroup();
        if (!isFullScreen()) {
            // Save state if window manager did not already switch to fullscreen.
            saveMainWindowSettings(saveConfigGroup);
            d->mStateBeforeFullScreen.mToolBarVisible = toolBar()->isVisible();
        }
        setAutoSaveSettings(saveConfigGroup, false);
        resetAutoSaveSettings();

        // Go full screen
        KToggleFullScreenAction::setFullScreen(this, true);
        menuBar()->hide();
        toolBar()->hide();

        qApp->setProperty("KDE_COLOR_SCHEME_PATH", d->mGvCore->fullScreenPaletteName());
        QApplication::setPalette(d->mGvCore->palette(GvCore::FullScreenPalette));

        d->setScreenSaverEnabled(false);
    } else {
        setAutoSaveSettings();

        // Back to normal
        qApp->setProperty("KDE_COLOR_SCHEME_PATH", QVariant());
        QApplication::setPalette(d->mGvCore->palette(GvCore::NormalPalette));

        d->mSlideShow->pause();
        KToggleFullScreenAction::setFullScreen(this, false);
        menuBar()->setVisible(d->mShowMenuBarAction->isChecked());
        toolBar()->setVisible(d->mStateBeforeFullScreen.mToolBarVisible);

        d->setScreenSaverEnabled(true);

        // See resizeEvent
        d->mFullScreenLeftAt = QDateTime::currentDateTime();
    }

    d->mFullScreenContent->setFullScreenMode(checked);
    d->mBrowseMainPage->setFullScreenMode(checked);
    d->mViewMainPage->setFullScreenMode(checked);
    d->mSaveBar->setFullScreenMode(checked);

    toggleSideBar(d->sideBarVisibility());
    toggleStatusBar(d->statusBarVisibility());

    setUpdatesEnabled(true);
    d->autoAssignThumbnailProvider();
}

void MainWindow::saveCurrent()
{
    d->mGvCore->save(d->mContextManager->currentUrl());
}

void MainWindow::saveCurrentAs()
{
    d->mGvCore->saveAs(d->mContextManager->currentUrl());
}

void MainWindow::reload()
{
    if (d->mCurrentMainPageId == ViewMainPageId) {
        d->mViewMainPage->reload();
    } else {
        d->mBrowseMainPage->reload();
    }
}

void MainWindow::openFile()
{
    QUrl dirUrl = d->mContextManager->currentDirUrl();

    DialogGuard<QFileDialog> dialog(this);
    dialog->setDirectoryUrl(dirUrl);
    dialog->setWindowTitle(i18nc("@title:window", "Open Image"));
    const QStringList mimeFilter = MimeTypeUtils::imageMimeTypes();
    dialog->setMimeTypeFilters(mimeFilter);
    dialog->setAcceptMode(QFileDialog::AcceptOpen);
    if (!dialog->exec()) {
        return;
    }

    if (!dialog->selectedUrls().isEmpty()) {
        openUrl(dialog->selectedUrls().first());
    }
}

void MainWindow::openUrl(const QUrl& url)
{
    d->setActionsDisabledOnStartMainPageEnabled(true);
    d->mContextManager->setUrlToSelect(url);
    d->mViewAction->trigger();
}

void MainWindow::showDocumentInFullScreen(const QUrl &url)
{
    d->mContextManager->setUrlToSelect(url);
    d->mViewAction->trigger();
    d->mFullScreenAction->trigger();
}

void MainWindow::toggleSlideShow()
{
    if (d->mSlideShow->isRunning()) {
        d->mSlideShow->pause();
    } else {
        if (!d->mViewAction->isChecked()) {
            d->mViewAction->trigger();
        }
        if (!d->mFullScreenAction->isChecked()) {
            d->mFullScreenAction->trigger();
        }
        QList<QUrl> list;
        for (int pos = 0; pos < d->mDirModel->rowCount(); ++pos) {
            QModelIndex index = d->mDirModel->index(pos, 0);
            KFileItem item = d->mDirModel->itemForIndex(index);
            MimeTypeUtils::Kind kind = MimeTypeUtils::fileItemKind(item);
            switch (kind) {
            case MimeTypeUtils::KIND_SVG_IMAGE:
            case MimeTypeUtils::KIND_RASTER_IMAGE:
            case MimeTypeUtils::KIND_VIDEO:
                list << item.url();
                break;
            default:
                break;
            }
        }
        d->mSlideShow->start(list);
    }
    updateSlideShowAction();
}

void MainWindow::updateSlideShowAction()
{
    if (d->mSlideShow->isRunning()) {
        d->mToggleSlideShowAction->setText(i18n("Pause Slideshow"));
        d->mToggleSlideShowAction->setIcon(QIcon::fromTheme("media-playback-pause"));
    } else {
        d->mToggleSlideShowAction->setText(d->mFullScreenAction->isChecked() ? i18n("Resume Slideshow")
                                                                             : i18n("Start Slideshow"));
        d->mToggleSlideShowAction->setIcon(QIcon::fromTheme("media-playback-start"));
    }
}

bool MainWindow::queryClose()
{
    saveConfig();
    QList<QUrl> list = DocumentFactory::instance()->modifiedDocumentList();
    if (list.size() == 0) {
        return true;
    }

    KGuiItem yes(i18n("Save All Changes"), "document-save-all");
    KGuiItem no(i18n("Discard Changes"), "delete");
    QString msg = i18np("One image has been modified.", "%1 images have been modified.", list.size())
                  + '\n'
                  + i18n("If you quit now, your changes will be lost.");
    int answer = KMessageBox::warningYesNoCancel(
                     this,
                     msg,
                     QString() /* caption */,
                     yes,
                     no);

    switch (answer) {
    case KMessageBox::Yes:
        d->mGvCore->saveAll();
        // We need to wait a bit because the DocumentFactory is notified about
        // saved documents through a queued connection.
        qApp->processEvents();
        return DocumentFactory::instance()->modifiedDocumentList().isEmpty();

    case KMessageBox::No:
        return true;

    default: // cancel
        return false;
    }
}

void MainWindow::showConfigDialog()
{
    // Save first so changes like thumbnail zoom level are not lost when reloading config
    saveConfig();
    
    DialogGuard<ConfigDialog> dialog(this);
    connect(dialog.data(), &KConfigDialog::settingsChanged, this, &MainWindow::loadConfig);
    dialog->exec();
}

void MainWindow::configureShortcuts()
{
    guiFactory()->configureShortcuts();
    guiFactory()->refreshActionProperties();
}

void MainWindow::toggleMenuBar()
{
    if (!d->mFullScreenAction->isChecked()) {
        if (!d->mShowMenuBarAction->isChecked()) {
            const QString accel = d->mShowMenuBarAction->shortcut().toString();
            KMessageBox::information(this, i18n("This will hide the menu bar completely."
                                                " You can show it again by typing %1.", accel),
                                     i18n("Hide menu bar"), QLatin1String("HideMenuBarWarning"));
        }
        menuBar()->setVisible(d->mShowMenuBarAction->isChecked());
    }
}

void MainWindow::loadConfig()
{
    d->mDirModel->setBlackListedExtensions(GwenviewConfig::blackListedExtensions());
    d->mDirModel->adjustKindFilter(MimeTypeUtils::KIND_VIDEO, GwenviewConfig::listVideos());

    if (GwenviewConfig::historyEnabled()) {
        d->mFileOpenRecentAction->loadEntries(KConfigGroup(KSharedConfig::openConfig(), "Recent Files"));
        const auto mFileOpenRecentActionUrls = d->mFileOpenRecentAction->urls();
        for (const QUrl& url : mFileOpenRecentActionUrls) {
            d->mGvCore->addUrlToRecentFiles(url);
        }
    } else {
        d->mFileOpenRecentAction->clear();
    }
    d->mFileOpenRecentAction->setVisible(GwenviewConfig::historyEnabled());

    d->mStartMainPage->loadConfig();
    d->mViewMainPage->loadConfig();
    d->mBrowseMainPage->loadConfig();
    d->mContextManager->loadConfig();
    d->mSideBar->loadConfig();
    d->loadSplitterConfig();
}

void MainWindow::saveConfig()
{
    d->mFileOpenRecentAction->saveEntries(KConfigGroup(KSharedConfig::openConfig(), "Recent Files"));
    d->mViewMainPage->saveConfig();
    d->mBrowseMainPage->saveConfig();
    d->mContextManager->saveConfig();
    d->saveSplitterConfig();
    GwenviewConfig::setFullScreenModeActive(isFullScreen());
}

void MainWindow::print()
{
    if (!d->mContextManager->currentUrlIsRasterImage()) {
        return;
    }

    Document::Ptr doc = DocumentFactory::instance()->load(d->mContextManager->currentUrl());
    PrintHelper printHelper(this);
    printHelper.print(doc);
}

void MainWindow::preloadNextUrl()
{
    static bool disablePreload = qgetenv("GV_MAX_UNREFERENCED_IMAGES") == "0";
    if (disablePreload) {
        qCDebug(GWENVIEW_APP_LOG) << "Preloading disabled";
        return;
    }
    QItemSelection selection = d->mContextManager->selectionModel()->selection();
    if (selection.size() != 1) {
        return;
    }

    QModelIndexList indexList = selection.indexes();
    if (indexList.isEmpty()) {
        return;
    }

    QModelIndex index = indexList.at(0);
    if (!index.isValid()) {
        return;
    }

    if (d->mCurrentMainPageId == ViewMainPageId) {
        // If we are in view mode, preload the next url, otherwise preload the
        // selected one
        int offset = d->mPreloadDirectionIsForward ? 1 : -1;
        index = d->mDirModel->sibling(index.row() + offset, index.column(), index);
        if (!index.isValid()) {
            return;
        }
    }

    KFileItem item = d->mDirModel->itemForIndex(index);
    if (!ArchiveUtils::fileItemIsDirOrArchive(item)) {
        QUrl url = item.url();
        if (url.isLocalFile()) {
            QSize size = d->mViewStackedWidget->size();
            d->mPreloader->preload(url, size);
        }
    }
}

QSize MainWindow::sizeHint() const
{
    return KXmlGuiWindow::sizeHint().expandedTo(QSize(750, 500));
}

void MainWindow::showEvent(QShowEvent *event)
{
    // We need to delay initializing the action state until the menu bar has
    // been initialized, that's why it's done only in the showEvent()
    d->mShowMenuBarAction->setChecked(menuBar()->isVisible());
    KXmlGuiWindow::showEvent(event);
}

void MainWindow::resizeEvent(QResizeEvent* event)
{
    KXmlGuiWindow::resizeEvent(event);
    // This is a small hack to execute code after leaving fullscreen, and after
    // the window has been resized back to its former size.
    if (d->mFullScreenLeftAt.isValid() && d->mFullScreenLeftAt.secsTo(QDateTime::currentDateTime()) < 2) {
        if (d->mCurrentMainPageId == BrowseMainPageId) {
            d->mThumbnailView->scrollToSelectedIndex();
        }
        d->mFullScreenLeftAt = QDateTime();
    }
}

bool MainWindow::eventFilter(QObject *obj, QEvent *event)
{
    Q_UNUSED(obj);
    Q_UNUSED(event);
#ifdef Q_OS_OSX
    /**
    * handle Mac OS X file open events (only exist on OS X)
    */
    if (event->type() == QEvent::FileOpen) {
        QFileOpenEvent *fileOpenEvent = static_cast<QFileOpenEvent*>(event);
        openUrl(fileOpenEvent->url());
        return true;
    }
#endif
    if (obj == d->mThumbnailView->viewport()) {
        switch(event->type()) {
        case QEvent::MouseButtonPress:
        case QEvent::MouseButtonDblClick:
            mouseButtonNavigate(static_cast<QMouseEvent*>(event));
            break;
        default: ;
        }
    }
    return false;
}

void MainWindow::mousePressEvent(QMouseEvent *event)
{
    mouseButtonNavigate(event);
    KXmlGuiWindow::mousePressEvent(event);
}

void MainWindow::mouseDoubleClickEvent(QMouseEvent *event)
{
    mouseButtonNavigate(event);
    KXmlGuiWindow::mouseDoubleClickEvent(event);
}

void MainWindow::mouseButtonNavigate(QMouseEvent *event)
{
    switch(event->button()) {
    case Qt::ForwardButton:
        if (d->mGoToNextAction->isEnabled()) {
            d->mGoToNextAction->trigger();
            return;
        }
        break;
    case Qt::BackButton:
        if (d->mGoToPreviousAction->isEnabled()) {
            d->mGoToPreviousAction->trigger();
            return;
        }
        break;
    default: ;
    }
}

void MainWindow::setDistractionFreeMode(bool value)
{
    d->mFullScreenContent->setDistractionFreeMode(value);
}

void MainWindow::saveProperties(KConfigGroup& group)
{
    group.writeEntry(SESSION_CURRENT_PAGE_KEY, int(d->mCurrentMainPageId));
    group.writeEntry(SESSION_URL_KEY, d->mContextManager->currentUrl().toString());
}

void MainWindow::readProperties(const KConfigGroup& group)
{
    const QUrl url = group.readEntry(SESSION_URL_KEY, QUrl());
    if (url.isValid()) {
        goToUrl(url);
    }

    MainPageId pageId = MainPageId(group.readEntry(SESSION_CURRENT_PAGE_KEY, int(StartMainPageId)));
    if (pageId == StartMainPageId) {
        showStartMainPage();
    } else if (pageId == BrowseMainPageId) {
        d->mBrowseAction->trigger();
    } else {
        d->mViewAction->trigger();
    }
}

void MainWindow::showFirstDocumentReached()
{
    if (d->mCurrentMainPageId != ViewMainPageId) {
        return;
    }
    HudButtonBox* dlg = new HudButtonBox;
    dlg->setText(i18n("You reached the first document, what do you want to do?"));
    dlg->addButton(i18n("Stay There"));
    dlg->addAction(d->mGoToLastAction, i18n("Go to the Last Document"));
    dlg->addAction(d->mBrowseAction, i18n("Go Back to the Document List"));
    dlg->addCountDown(15000);
    d->mViewMainPage->showMessageWidget(dlg, Qt::AlignCenter);
}

void MainWindow::showLastDocumentReached()
{
    if (d->mCurrentMainPageId != ViewMainPageId) {
        return;
    }
    HudButtonBox* dlg = new HudButtonBox;
    dlg->setText(i18n("You reached the last document, what do you want to do?"));
    dlg->addButton(i18n("Stay There"));
    dlg->addAction(d->mGoToFirstAction, i18n("Go to the First Document"));
    dlg->addAction(d->mBrowseAction, i18n("Go Back to the Document List"));
    dlg->addCountDown(15000);
    d->mViewMainPage->showMessageWidget(dlg, Qt::AlignCenter);
}

void MainWindow::replaceLocation()
{
    QLineEdit* lineEdit = d->mUrlNavigator->editor()->lineEdit();

    // If the text field currently has focus and everything is selected,
    // pressing the keyboard shortcut returns the whole thing to breadcrumb mode
    if (d->mUrlNavigator->isUrlEditable()
        && lineEdit->hasFocus()
        && lineEdit->selectedText() == lineEdit->text() ) {
        d->mUrlNavigator->setUrlEditable(false);
    } else {
        d->mUrlNavigator->setUrlEditable(true);
        d->mUrlNavigator->setFocus();
        lineEdit->selectAll();
    }
}

} // namespace
