// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-

const Clutter = imports.gi.Clutter;
const GdkPixbuf = imports.gi.GdkPixbuf
const Gio = imports.gi.Gio;
const GLib = imports.gi.GLib;
const GObject = imports.gi.GObject;
const Gtk = imports.gi.Gtk;
const Signals = imports.signals;
const Meta = imports.gi.Meta;
const Shell = imports.gi.Shell;
const St = imports.gi.St;
const Mainloop = imports.mainloop;

// Use __ () and N__() for the extension gettext domain, and reuse
// the shell domain with the default _() and N_()
const Gettext = imports.gettext.domain('dashtodock');
const __ = Gettext.gettext;
const N__ = function(e) { return e };

const AppDisplay = imports.ui.appDisplay;
const AppFavorites = imports.ui.appFavorites;
const Dash = imports.ui.dash;
const DND = imports.ui.dnd;
const IconGrid = imports.ui.iconGrid;
const Main = imports.ui.main;
const PopupMenu = imports.ui.popupMenu;
const Util = imports.misc.util;
const Workspace = imports.ui.workspace;

const Me = imports.misc.extensionUtils.getCurrentExtension();
const Docking = Me.imports.docking;
const Utils = Me.imports.utils;
const WindowPreview = Me.imports.windowPreview;
const AppIconIndicators = Me.imports.appIconIndicators;

let tracker = Shell.WindowTracker.get_default();

const clickAction = {
    SKIP: 0,
    MINIMIZE: 1,
    LAUNCH: 2,
    CYCLE_WINDOWS: 3,
    MINIMIZE_OR_OVERVIEW: 4,
    PREVIEWS: 5,
    MINIMIZE_OR_PREVIEWS: 6,
    FOCUS_OR_PREVIEWS: 7,
    QUIT: 8,
};

const scrollAction = {
    DO_NOTHING: 0,
    CYCLE_WINDOWS: 1,
    SWITCH_WORKSPACE: 2
};

let recentlyClickedAppLoopId = 0;
let recentlyClickedApp = null;
let recentlyClickedAppWindows = null;
let recentlyClickedAppIndex = 0;
let recentlyClickedAppMonitor = -1;

/**
 * Extend AppIcon
 *
 * - Apply a css class based on the number of windows of each application (#N);
 * - Customized indicators for running applications in place of the default "dot" style which is hidden (#N);
 *   a class of the form "running#N" is applied to the AppWellIcon actor.
 *   like the original .running one.
 * - Add a .focused style to the focused app
 * - Customize click actions.
 * - Update minimization animation target
 * - Update menu if open on windows change
 */
var MyAppIcon = class DashToDock_AppIcon extends AppDisplay.AppIcon {

    // settings are required inside.
    constructor(remoteModel, app, monitorIndex, iconParams) {
        super(app, iconParams);

        // a prefix is required to avoid conflicting with the parent class variable
        this.monitorIndex = monitorIndex;
        this._signalsHandler = new Utils.GlobalSignalsHandler();
        this.remoteModel = remoteModel;
        this._indicator = null;

        let appInfo = app.get_app_info();
        this._location = appInfo ? appInfo.get_string('XdtdUri') : null;

        this._updateIndicatorStyle();
        this._optionalScrollCycleWindows();

        // Monitor windows-changes instead of app state.
        // Keep using the same Id and function callback (that is extended)
        if (this._stateChangedId > 0) {
            this.app.disconnect(this._stateChangedId);
            this._stateChangedId = 0;
        }

        this._windowsChangedId = this.app.connect('windows-changed',
                                                  this.onWindowsChanged.bind(this));
        this._focusAppChangeId = tracker.connect('notify::focus-app',
                                                 this._onFocusAppChanged.bind(this));

        // In Wayland sessions, this signal is needed to track the state of windows dragged
        // from one monitor to another. As this is triggered quite often (whenever a new winow
        // of any application opened or moved to a different desktop),
        // we restrict this signal to  the case when 'isolate-monitors' is true,
        // and if there are at least 2 monitors.
        if (Docking.DockManager.settings.get_boolean('isolate-monitors') &&
            Main.layoutManager.monitors.length > 1) {
            this._signalsHandler.removeWithLabel('isolate-monitors');
            this._signalsHandler.addWithLabel('isolate-monitors', [
                global.display,
                'window-entered-monitor',
                this._onWindowEntered.bind(this)
            ]);
        }

        this._progressOverlayArea = null;
        this._progress = 0;

        let keys = ['apply-custom-theme',
                   'running-indicator-style',
                    ];

        keys.forEach(function(key) {
            this._signalsHandler.add([
                Docking.DockManager.settings,
                'changed::' + key,
                this._updateIndicatorStyle.bind(this)
            ]);
        }, this);

        if (this._location) {
            this._signalsHandler.add([
                Docking.DockManager.getDefault().fm1Client,
                'windows-changed',
                this.onWindowsChanged.bind(this)
            ]);
        }

        this._signalsHandler.add([
            Docking.DockManager.settings,
            'changed::scroll-action',
            this._optionalScrollCycleWindows.bind(this)
        ]);

        this._numberOverlay();

        this._previewMenuManager = null;
        this._previewMenu = null;
    }

    _onDestroy() {
        super._onDestroy();

        // This is necessary due to an upstream bug
        // https://bugzilla.gnome.org/show_bug.cgi?id=757556
        // It can be safely removed once it get solved upstrea.
        if (this._menu)
            this._menu.close(false);

        // Disconect global signals

        if (this._windowsChangedId > 0)
            this.app.disconnect(this._windowsChangedId);
        this._windowsChangedId = 0;

        if (this._focusAppChangeId > 0) {
            tracker.disconnect(this._focusAppChangeId);
            this._focusAppChangeId = 0;
        }

        this._signalsHandler.destroy();

        if (this._scrollEventHandler)
            this.actor.disconnect(this._scrollEventHandler);
    }

    // TOOD Rename this function
    _updateIndicatorStyle() {

        if (this._indicator !== null) {
            this._indicator.destroy();
            this._indicator = null;
        }
        this._indicator = new AppIconIndicators.AppIconIndicator(this);
        this._indicator.update();
    }

    _onWindowEntered(metaScreen, monitorIndex, metaWin) {
        let app = Shell.WindowTracker.get_default().get_window_app(metaWin);
        if (app && app.get_id() == this.app.get_id())
            this.onWindowsChanged();
    }

    _optionalScrollCycleWindows() {
        if (this._scrollEventHandler) {
            this.actor.disconnect(this._scrollEventHandler);
            this._scrollEventHandler = 0;
        }

        let settings = Docking.DockManager.settings;
        let isEnabled = settings.get_enum('scroll-action') === scrollAction.CYCLE_WINDOWS;
        if (!isEnabled) return;
        this._scrollEventHandler = this.actor.connect('scroll-event',
                                                      this.onScrollEvent.bind(this));
    }

    onScrollEvent(actor, event) {

        // We only activate windows of running applications, i.e. we never open new windows
        // We check if the app is running, and that the # of windows is > 0 in
        // case we use workspace isolation,
        let appIsRunning = this.app.state == Shell.AppState.RUNNING
            && this.getInterestingWindows().length > 0;

        if (!appIsRunning)
            return false

        if (this._optionalScrollCycleWindowsDeadTimeId)
            return false;
        else
            this._optionalScrollCycleWindowsDeadTimeId = Mainloop.timeout_add(250, () => {
                this._optionalScrollCycleWindowsDeadTimeId = 0;
            });

        let direction = null;

        switch (event.get_scroll_direction()) {
        case Clutter.ScrollDirection.UP:
            direction = Meta.MotionDirection.UP;
            break;
        case Clutter.ScrollDirection.DOWN:
            direction = Meta.MotionDirection.DOWN;
            break;
        case Clutter.ScrollDirection.SMOOTH:
            let [dx, dy] = event.get_scroll_delta();
            if (dy < 0)
                direction = Meta.MotionDirection.UP;
            else if (dy > 0)
                direction = Meta.MotionDirection.DOWN;
            break;
        }

        let focusedApp = tracker.focus_app;
        if (!Main.overview._shown) {
            let reversed = direction === Meta.MotionDirection.UP;
            if (this.app == focusedApp)
                this._cycleThroughWindows(reversed);
            else {
                // Activate the first window
                let windows = this.getInterestingWindows();
                if (windows.length > 0) {
                    let w = windows[0];
                    Main.activateWindow(w);
                }
            }
        }
        else
            this.app.activate();
        return true;
    }

    onWindowsChanged() {

        if (this._menu && this._menu.isOpen)
            this._menu.update();

        this._indicator.update();
        this.updateIconGeometry();
    }

    /**
     * Update taraget for minimization animation
     */
    updateIconGeometry() {
        // If (for unknown reason) the actor is not on the stage the reported size
        // and position are random values, which might exceeds the integer range
        // resulting in an error when assigned to the a rect. This is a more like
        // a workaround to prevent flooding the system with errors.
        if (this.actor.get_stage() == null)
            return;

        let rect = new Meta.Rectangle();

        [rect.x, rect.y] = this.actor.get_transformed_position();
        [rect.width, rect.height] = this.actor.get_transformed_size();

        let windows = this.getWindows();
        if (Docking.DockManager.settings.get_boolean('multi-monitor')) {
            let monitorIndex = this.monitorIndex;
            windows = windows.filter(function(w) {
                return w.get_monitor() == monitorIndex;
            });
        }
        windows.forEach(function(w) {
            w.set_icon_geometry(rect);
        });
    }

    _updateRunningStyle() {
        // The logic originally in this function has been moved to
        // AppIconIndicatorBase._updateDefaultDot(). However it cannot be removed as
        // it called by the parent constructor.
    }

    popupMenu() {
        this._removeMenuTimeout();
        this.actor.fake_release();
        this._draggable.fakeRelease();

        if (!this._menu) {
            this._menu = new MyAppIconMenu(this);
            this._menu.connect('activate-window', (menu, window) => {
                this.activateWindow(window);
            });
            this._menu.connect('open-state-changed', (menu, isPoppedUp) => {
                if (!isPoppedUp)
                    this._onMenuPoppedDown();
                else {
                    // Setting the max-height is s useful if part of the menu is
                    // scrollable so the minimum height is smaller than the natural height.
                    let monitor_index = Main.layoutManager.findIndexForActor(this.actor);
                    let workArea = Main.layoutManager.getWorkAreaForMonitor(monitor_index);
                    let position = Utils.getPosition();
                    this._isHorizontal = ( position == St.Side.TOP ||
                                           position == St.Side.BOTTOM);
                    // If horizontal also remove the height of the dash
                    let fixedDock = Docking.DockManager.settings.get_boolean('dock-fixed');
                    let additional_margin = this._isHorizontal && !fixedDock ? Main.overview._dash.actor.height : 0;
                    let verticalMargins = this._menu.actor.margin_top + this._menu.actor.margin_bottom;
                    // Also set a max width to the menu, so long labels (long windows title) get truncated
                    this._menu.actor.style = ('max-height: ' + Math.round(workArea.height - additional_margin - verticalMargins) + 'px;' +
                                              'max-width: 400px');
                }
            });
            let id = Main.overview.connect('hiding', () => {
                this._menu.close();
            });
            this._menu.actor.connect('destroy', function() {
                Main.overview.disconnect(id);
            });

            this._menuManager.addMenu(this._menu);
        }

        this.emit('menu-state-changed', true);

        this.actor.set_hover(true);
        this._menu.popup();
        this._menuManager.ignoreRelease();
        this.emit('sync-tooltip');

        return false;
    }

    _onFocusAppChanged() {
        this._indicator.update();
    }

    activate(button) {
        let event = Clutter.get_current_event();
        let modifiers = event ? event.get_state() : 0;
        let focusedApp = tracker.focus_app;

        // Only consider SHIFT and CONTROL as modifiers (exclude SUPER, CAPS-LOCK, etc.)
        modifiers = modifiers & (Clutter.ModifierType.SHIFT_MASK | Clutter.ModifierType.CONTROL_MASK);

        // We don't change the CTRL-click behaviour: in such case we just chain
        // up the parent method and return.
        if (modifiers & Clutter.ModifierType.CONTROL_MASK) {
                // Keep default behaviour: launch new window
                // By calling the parent method I make it compatible
                // with other extensions tweaking ctrl + click
                super.activate(button);
                return;
        }

        // We check what type of click we have and if the modifier SHIFT is
        // being used. We then define what buttonAction should be for this
        // event.
        let buttonAction = 0;
        let settings = Docking.DockManager.settings;
        if (button && button == 2 ) {
            if (modifiers & Clutter.ModifierType.SHIFT_MASK)
                buttonAction = settings.get_enum('shift-middle-click-action');
            else
                buttonAction = settings.get_enum('middle-click-action');
        }
        else if (button && button == 1) {
            if (modifiers & Clutter.ModifierType.SHIFT_MASK)
                buttonAction = settings.get_enum('shift-click-action');
            else
                buttonAction = settings.get_enum('click-action');
        }

        // We check if the app is running, and that the # of windows is > 0 in
        // case we use workspace isolation.
        let windows = this.getInterestingWindows();
        let appIsRunning = (this.app.state == Shell.AppState.RUNNING || this.isLocation())
            && windows.length > 0;

        // Some action modes (e.g. MINIMIZE_OR_OVERVIEW) require overview to remain open
        // This variable keeps track of this
        let shouldHideOverview = true;

        // We customize the action only when the application is already running
        if (appIsRunning) {
            switch (buttonAction) {
            case clickAction.MINIMIZE:
                // In overview just activate the app, unless the acion is explicitely
                // requested with a keyboard modifier
                if (!Main.overview._shown || modifiers){
                    // If we have button=2 or a modifier, allow minimization even if
                    // the app is not focused
                    if (this.app == focusedApp || button == 2 || modifiers & Clutter.ModifierType.SHIFT_MASK) {
                        // minimize all windows on double click and always in the case of primary click without
                        // additional modifiers
                        let click_count = 0;
                        if (Clutter.EventType.CLUTTER_BUTTON_PRESS)
                            click_count = event.get_click_count();
                        let all_windows = (button == 1 && ! modifiers) || click_count > 1;
                        this._minimizeWindow(all_windows);
                    }
                    else
                        this._activateAllWindows();
                }
                else {
                    let w = windows[0];
                    Main.activateWindow(w);
                }
                break;

            case clickAction.MINIMIZE_OR_OVERVIEW:
                // When a single window is present, toggle minimization
                // If only one windows is present toggle minimization, but only when trigggered with the
                // simple click action (no modifiers, no middle click).
                if (windows.length == 1 && !modifiers && button == 1) {
                    let w = windows[0];
                    if (this.app == focusedApp) {
                        // Window is raised, minimize it
                        this._minimizeWindow(w);
                    } else {
                        // Window is minimized, raise it
                        Main.activateWindow(w);
                    }
                    // Launch overview when multiple windows are present
                    // TODO: only show current app windows when gnome shell API will allow it
                } else {
                    shouldHideOverview = false;
                    Main.overview.toggle();
                }
                break;

            case clickAction.CYCLE_WINDOWS:
                if (!Main.overview._shown){
                    if (this.app == focusedApp)
                        this._cycleThroughWindows();
                    else {
                        // Activate the first window
                        let w = windows[0];
                        Main.activateWindow(w);
                    }
                }
                else
                    this.app.activate();
                break;

            case clickAction.FOCUS_OR_PREVIEWS:
                if (this.app == focusedApp &&
                    (windows.length > 1 || modifiers || button != 1)) {
                    this._windowPreviews();
                } else {
                    // Activate the first window
                    let w = windows[0];
                    Main.activateWindow(w);
                }
                break;

            case clickAction.LAUNCH:
                this.launchNewWindow();
                break;

            case clickAction.PREVIEWS:
                if (!Main.overview._shown) {
                    // If only one windows is present just switch to it, but only when trigggered with the
                    // simple click action (no modifiers, no middle click).
                    if (windows.length == 1 && !modifiers && button == 1) {
                        let w = windows[0];
                        Main.activateWindow(w);
                    } else
                        this._windowPreviews();
                }
                else {
                    this.app.activate();
                }
                break;

            case clickAction.MINIMIZE_OR_PREVIEWS:
                // When a single window is present, toggle minimization
                // If only one windows is present toggle minimization, but only when trigggered with the
                // simple click action (no modifiers, no middle click).
                if (!Main.overview._shown){
                    if (windows.length == 1 && !modifiers && button == 1) {
                        let w = windows[0];
                        if (this.app == focusedApp) {
                            // Window is raised, minimize it
                            this._minimizeWindow(w);
                        } else {
                            // Window is minimized, raise it
                            Main.activateWindow(w);
                        }
                    } else {
                        // Launch previews when multiple windows are present
                        this._windowPreviews();
                    }
                } else {
                    this.app.activate();
                }
                break;

            case clickAction.QUIT:
                this.closeAllWindows();
                break;

            case clickAction.SKIP:
                let w = windows[0];
                Main.activateWindow(w);
                break;
            }
        }
        else {
            this.launchNewWindow();
        }

        // Hide overview except when action mode requires it
        if(shouldHideOverview) {
            Main.overview.hide();
        }
    }

    shouldShowTooltip() {
        return this.actor.hover && (!this._menu || !this._menu.isOpen) &&
                            (!this._previewMenu || !this._previewMenu.isOpen);
    }

    _windowPreviews() {
        if (!this._previewMenu) {
            this._previewMenuManager = new PopupMenu.PopupMenuManager(this.actor);

            this._previewMenu = new WindowPreview.WindowPreviewMenu(this);

            this._previewMenuManager.addMenu(this._previewMenu);

            this._previewMenu.connect('open-state-changed', (menu, isPoppedUp) => {
                if (!isPoppedUp)
                    this._onMenuPoppedDown();
            });
            let id = Main.overview.connect('hiding', () => {
                this._previewMenu.close();
            });
            this._previewMenu.actor.connect('destroy', function() {
                Main.overview.disconnect(id);
            });

        }

        if (this._previewMenu.isOpen)
            this._previewMenu.close();
        else
            this._previewMenu.popup();

        return false;
    }

    // Try to do the right thing when attempting to launch a new window of an app. In
    // particular, if the application doens't allow to launch a new window, activate
    // the existing window instead.
    launchNewWindow(p) {
        let appInfo = this.app.get_app_info();
        let actions = appInfo.list_actions();
        if (this.app.can_open_new_window()) {
            this.animateLaunch();
            // This is used as a workaround for a bug resulting in no new windows being opened
            // for certain running applications when calling open_new_window().
            //
            // https://bugzilla.gnome.org/show_bug.cgi?id=756844
            //
            // Similar to what done when generating the popupMenu entries, if the application provides
            // a "New Window" action, use it instead of directly requesting a new window with
            // open_new_window(), which fails for certain application, notably Nautilus.
            if (actions.indexOf('new-window') == -1) {
                this.app.open_new_window(-1);
            }
            else {
                let i = actions.indexOf('new-window');
                if (i !== -1)
                    this.app.launch_action(actions[i], global.get_current_time(), -1);
            }
        }
        else {
            // Try to manually activate the first window. Otherwise, when the app is activated by
            // switching to a different workspace, a launch spinning icon is shown and disappers only
            // after a timeout.
            let windows = this.getWindows();
            if (windows.length > 0)
                Main.activateWindow(windows[0])
            else
                this.app.activate();
        }
    }

    _numberOverlay() {
        // Add label for a Hot-Key visual aid
        this._numberOverlayLabel = new St.Label();
        this._numberOverlayBin = new St.Bin({
            child: this._numberOverlayLabel,
            x_align: St.Align.START, y_align: St.Align.START,
            x_expand: true, y_expand: true
        });
        this._numberOverlayLabel.add_style_class_name('number-overlay');
        this._numberOverlayOrder = -1;
        this._numberOverlayBin.hide();

        this._iconContainer.add_child(this._numberOverlayBin);

    }

    updateNumberOverlay() {
        // We apply an overall scale factor that might come from a HiDPI monitor.
        // Clutter dimensions are in physical pixels, but CSS measures are in logical
        // pixels, so make sure to consider the scale.
        let scaleFactor = St.ThemeContext.get_for_stage(global.stage).scale_factor;
        // Set the font size to something smaller than the whole icon so it is
        // still visible. The border radius is large to make the shape circular
        let [minWidth, natWidth] = this._iconContainer.get_preferred_width(-1);
        let font_size = Math.round(Math.max(12, 0.3*natWidth) / scaleFactor);
        let size = Math.round(font_size*1.2);
        this._numberOverlayLabel.set_style(
           'font-size: ' + font_size + 'px;' +
           'border-radius: ' + this.icon.iconSize + 'px;' +
           'width: ' + size + 'px; height: ' + size +'px;'
        );
    }

    setNumberOverlay(number) {
        this._numberOverlayOrder = number;
        this._numberOverlayLabel.set_text(number.toString());
    }

    toggleNumberOverlay(activate) {
        if (activate && this._numberOverlayOrder > -1) {
            this.updateNumberOverlay();
            this._numberOverlayBin.show();
        }
        else
            this._numberOverlayBin.hide();
    }

    _minimizeWindow(param) {
        // Param true make all app windows minimize
        let windows = this.getInterestingWindows();
        let current_workspace = global.workspace_manager.get_active_workspace();
        for (let i = 0; i < windows.length; i++) {
            let w = windows[i];
            if (w.get_workspace() == current_workspace && w.showing_on_its_workspace()) {
                w.minimize();
                // Just minimize one window. By specification it should be the
                // focused window on the current workspace.
                if(!param)
                    break;
            }
        }
    }

    // By default only non minimized windows are activated.
    // This activates all windows in the current workspace.
    _activateAllWindows() {
        // First activate first window so workspace is switched if needed.
        // We don't do this if isolation is on!
        if (!Docking.DockManager.settings.get_boolean('isolate-workspaces') &&
            !Docking.DockManager.settings.get_boolean('isolate-monitors'))
            this.app.activate();

        // then activate all other app windows in the current workspace
        let windows = this.getInterestingWindows();
        let activeWorkspace = global.workspace_manager.get_active_workspace_index();

        if (windows.length <= 0)
            return;

        let activatedWindows = 0;

        for (let i = windows.length - 1; i >= 0; i--) {
            if (windows[i].get_workspace().index() == activeWorkspace) {
                Main.activateWindow(windows[i]);
                activatedWindows++;
            }
        }
    }

    //This closes all windows of the app.
    closeAllWindows() {
        let windows = this.getInterestingWindows();
        for (let i = 0; i < windows.length; i++)
            windows[i].delete(global.get_current_time());
    }

    _cycleThroughWindows(reversed) {
        // Store for a little amount of time last clicked app and its windows
        // since the order changes upon window interaction
        let MEMORY_TIME=3000;

        let app_windows = this.getInterestingWindows();

        if (app_windows.length <1)
            return

        if (recentlyClickedAppLoopId > 0)
            Mainloop.source_remove(recentlyClickedAppLoopId);
        recentlyClickedAppLoopId = Mainloop.timeout_add(MEMORY_TIME, this._resetRecentlyClickedApp);

        // If there isn't already a list of windows for the current app,
        // or the stored list is outdated, use the current windows list.
        let monitorIsolation = Docking.DockManager.settings.get_boolean('isolate-monitors');
        if (!recentlyClickedApp ||
            recentlyClickedApp.get_id() != this.app.get_id() ||
            recentlyClickedAppWindows.length != app_windows.length ||
            (recentlyClickedAppMonitor != this.monitorIndex && monitorIsolation)) {
            recentlyClickedApp = this.app;
            recentlyClickedAppWindows = app_windows;
            recentlyClickedAppMonitor = this.monitorIndex;
            recentlyClickedAppIndex = 0;
        }

        if (reversed) {
            recentlyClickedAppIndex--;
            if (recentlyClickedAppIndex < 0) recentlyClickedAppIndex = recentlyClickedAppWindows.length - 1;
        } else {
            recentlyClickedAppIndex++;
        }
        let index = recentlyClickedAppIndex % recentlyClickedAppWindows.length;
        let window = recentlyClickedAppWindows[index];

        Main.activateWindow(window);
    }

    _resetRecentlyClickedApp() {
        if (recentlyClickedAppLoopId > 0)
            Mainloop.source_remove(recentlyClickedAppLoopId);
        recentlyClickedAppLoopId=0;
        recentlyClickedApp =null;
        recentlyClickedAppWindows = null;
        recentlyClickedAppIndex = 0;
        recentlyClickedAppMonitor = -1;

        return false;
    }

    getWindows() {
        return getWindows(this.app, this._location);
    }

    // Filter out unnecessary windows, for instance
    // nautilus desktop window.
    getInterestingWindows() {
        return getInterestingWindows(this.app, this.monitorIndex, this._location);
    }

    // Does the Icon represent a location rather than an App
    isLocation() {
        return this._location != null;
    }
};
/**
 * Extend AppIconMenu
 *
 * - set popup arrow side based on dash orientation
 * - Add close windows option based on quitfromdash extension
 *   (https://github.com/deuill/shell-extension-quitfromdash)
 * - Add open windows thumbnails instead of list
 * - update menu when application windows change
 */
const MyAppIconMenu = class DashToDock_MyAppIconMenu extends AppDisplay.AppIconMenu {

    constructor(source) {
        let side = Utils.getPosition();

        // Damm it, there has to be a proper way of doing this...
        // As I can't call the parent parent constructor (?) passing the side
        // parameter, I overwite what I need later
        super(source);

        // Change the initialized side where required.
        this._arrowSide = side;
        this._boxPointer._arrowSide = side;
        this._boxPointer._userArrowSide = side;
    }

    _redisplay() {
        this.removeAll();

        if (Docking.DockManager.settings.get_boolean('show-windows-preview')) {
            // Display the app windows menu items and the separator between windows
            // of the current desktop and other windows.

            this._allWindowsMenuItem = new PopupMenu.PopupSubMenuMenuItem(__('All Windows'), false);
            this._allWindowsMenuItem.actor.hide();
            this.addMenuItem(this._allWindowsMenuItem);

            if (!this._source.app.is_window_backed()) {
                this._appendSeparator();

                let appInfo = this._source.app.get_app_info();
                let actions = appInfo.list_actions();
                if (this._source.app.can_open_new_window() &&
                    actions.indexOf('new-window') == -1) {
                    this._newWindowMenuItem = this._appendMenuItem(_("New Window"));
                    this._newWindowMenuItem.connect('activate', () => {
                        if (this._source.app.state == Shell.AppState.STOPPED)
                            this._source.animateLaunch();

                        this._source.app.open_new_window(-1);
                        this.emit('activate-window', null);
                    });
                    this._appendSeparator();
                }


                if (AppDisplay.discreteGpuAvailable &&
                    this._source.app.state == Shell.AppState.STOPPED &&
                    actions.indexOf('activate-discrete-gpu') == -1) {
                    this._onDiscreteGpuMenuItem = this._appendMenuItem(_("Launch using Dedicated Graphics Card"));
                    this._onDiscreteGpuMenuItem.connect('activate', () => {
                        if (this._source.app.state == Shell.AppState.STOPPED)
                            this._source.animateLaunch();

                        this._source.app.launch(0, -1, true);
                        this.emit('activate-window', null);
                    });
                }

                for (let i = 0; i < actions.length; i++) {
                    let action = actions[i];
                    let item = this._appendMenuItem(appInfo.get_action_name(action));
                    item.connect('activate', (emitter, event) => {
                        this._source.app.launch_action(action, event.get_time(), -1);
                        this.emit('activate-window', null);
                    });
                }

                let canFavorite = global.settings.is_writable('favorite-apps') &&
                                  !this._source.isLocation();

                if (canFavorite) {
                    this._appendSeparator();

                    let isFavorite = AppFavorites.getAppFavorites().isFavorite(this._source.app.get_id());

                    if (isFavorite) {
                        let item = this._appendMenuItem(_("Remove from Favorites"));
                        item.connect('activate', () => {
                            let favs = AppFavorites.getAppFavorites();
                            favs.removeFavorite(this._source.app.get_id());
                        });
                    } else {
                        let item = this._appendMenuItem(_("Add to Favorites"));
                        item.connect('activate', () => {
                            let favs = AppFavorites.getAppFavorites();
                            favs.addFavorite(this._source.app.get_id());
                        });
                    }
                }

                if (Shell.AppSystem.get_default().lookup_app('org.gnome.Software.desktop') &&
                    !this._source.isLocation()) {
                    this._appendSeparator();
                    let item = this._appendMenuItem(_("Show Details"));
                    item.connect('activate', () => {
                        let id = this._source.app.get_id();
                        let args = GLib.Variant.new('(ss)', [id, '']);
                        Gio.DBus.get(Gio.BusType.SESSION, null,
                            function(o, res) {
                                let bus = Gio.DBus.get_finish(res);
                                bus.call('org.gnome.Software',
                                         '/org/gnome/Software',
                                         'org.gtk.Actions', 'Activate',
                                         GLib.Variant.new('(sava{sv})',
                                                          ['details', [args], null]),
                                         null, 0, -1, null, null);
                                Main.overview.hide();
                            });
                    });
                }
            }

        } else {
            super._redisplay();
        }

        // quit menu
        this._appendSeparator();
        this._quitfromDashMenuItem = this._appendMenuItem(_("Quit"));
        this._quitfromDashMenuItem.connect('activate', () => {
            this._source.closeAllWindows();
        });

        this.update();
    }

    // update menu content when application windows change. This is desirable as actions
    // acting on windows (closing) are performed while the menu is shown.
    update() {

      if(Docking.DockManager.settings.get_boolean('show-windows-preview')){

          let windows = this._source.getInterestingWindows();

          // update, show or hide the quit menu
          if ( windows.length > 0) {
              let quitFromDashMenuText = "";
              if (windows.length == 1)
                  this._quitfromDashMenuItem.label.set_text(_("Quit"));
              else
                  this._quitfromDashMenuItem.label.set_text(_("Quit %d Windows").format(windows.length));

              this._quitfromDashMenuItem.actor.show();

          } else {
              this._quitfromDashMenuItem.actor.hide();
          }

          // update, show, or hide the allWindows menu
          // Check if there are new windows not already displayed. In such case, repopulate the allWindows
          // menu. Windows removal is already handled by each preview being connected to the destroy signal
          let old_windows = this._allWindowsMenuItem.menu._getMenuItems().map(function(item){
              return item._window;
          });

          let new_windows = windows.filter(function(w) {return old_windows.indexOf(w) < 0;});
          if (new_windows.length > 0) {
              this._populateAllWindowMenu(windows);

              // Try to set the width to that of the submenu.
              // TODO: can't get the actual size, getting a bit less.
              // Temporary workaround: add 15px to compensate
              this._allWindowsMenuItem.actor.width =  this._allWindowsMenuItem.menu.actor.width + 15;

          }

          // The menu is created hidden and never hidded after being shown. Instead, a singlal
          // connected to its items destroy will set is insensitive if no more windows preview are shown.
          if (windows.length > 0){
              this._allWindowsMenuItem.actor.show();
              this._allWindowsMenuItem.setSensitive(true);
          }

          // Update separators
          this._getMenuItems().forEach(this._updateSeparatorVisibility.bind(this));
      }


    }

    _populateAllWindowMenu(windows) {

        this._allWindowsMenuItem.menu.removeAll();

            if (windows.length > 0) {

                let activeWorkspace = global.workspace_manager.get_active_workspace();
                let separatorShown =  windows[0].get_workspace() != activeWorkspace;

                for (let i = 0; i < windows.length; i++) {
                    let window = windows[i];
                    if (!separatorShown && window.get_workspace() != activeWorkspace) {
                        this._allWindowsMenuItem.menu.addMenuItem(new PopupMenu.PopupSeparatorMenuItem());
                        separatorShown = true;
                    }

                    let item = new WindowPreview.WindowPreviewMenuItem(window);
                    this._allWindowsMenuItem.menu.addMenuItem(item);
                    item.connect('activate', () => {
                        this.emit('activate-window', window);
                    });

                    // This is to achieve a more gracefull transition when the last windows is closed.
                    item.connect('destroy', () => {
                        if(this._allWindowsMenuItem.menu._getMenuItems().length == 1) // It's still counting the item just going to be destroyed
                            this._allWindowsMenuItem.setSensitive(false);
                    });
                }
            }
    }
};
Signals.addSignalMethods(MyAppIconMenu.prototype);

function getWindows(app, location) {
    if (location != null && Docking.DockManager.getDefault().fm1Client) {
        return Docking.DockManager.getDefault().fm1Client.getWindows(location);
    } else {
        return app.get_windows();
    }
}

// Filter out unnecessary windows, for instance
// nautilus desktop window.
function getInterestingWindows(app, monitorIndex, location) {
    let windows = getWindows(app, location).filter(function(w) {
        return !w.skip_taskbar;
    });

    let settings = Docking.DockManager.settings;

    // When using workspace isolation, we filter out windows
    // that are not in the current workspace
    if (settings.get_boolean('isolate-workspaces'))
        windows = windows.filter(function(w) {
            return w.get_workspace().index() == global.workspace_manager.get_active_workspace_index();
        });

    if (settings.get_boolean('isolate-monitors'))
        windows = windows.filter(function(w) {
            return w.get_monitor() == monitorIndex;
        });

    return windows;
}

/**
 * A ShowAppsIcon improved class.
 *
 * - set label position based on dash orientation (Note, I am reusing most machinery of the appIcon class)
 * - implement a popupMenu based on the AppIcon code (Note, I am reusing most machinery of the appIcon class)
 *
 */

var MyShowAppsIcon = GObject.registerClass({
    Signals: {
        'menu-state-changed': { param_types: [GObject.TYPE_BOOLEAN] },
        'sync-tooltip': {}
    }
}
, class DashToDock_MyShowAppsIcon extends Dash.ShowAppsIcon {
    _init() {
        super._init();

        // Re-use appIcon methods
        let appIconPrototype = AppDisplay.AppIcon.prototype;
        this.actor.connect('leave-event', appIconPrototype._onLeaveEvent.bind(this));
        this.actor.connect('button-press-event', appIconPrototype._onButtonPress.bind(this));
        this.actor.connect('touch-event', appIconPrototype._onTouchEvent.bind(this));
        this.actor.connect('popup-menu', appIconPrototype._onKeyboardPopupMenu.bind(this));
        this.actor.connect('clicked', this._removeMenuTimeout.bind(this));

        this._menu = null;
        this._menuManager = new PopupMenu.PopupMenuManager(this.actor);
        this._menuTimeoutId = 0;
    }

    get actor() {
        /* Until GNOME Shell AppIcon is an actor we need to provide this
         * compatibility layer or the shell won't be able to access to the
         * actual actor */
        return this.toggleButton;
    }

    showLabel() {
        itemShowLabel.call(this);
    }

    _onMenuPoppedDown() {
        AppDisplay.AppIcon.prototype._onMenuPoppedDown.apply(this, arguments);
    }

    _setPopupTimeout() {
        AppDisplay.AppIcon.prototype._onMenuPoppedDown.apply(this, arguments);
    }

    _removeMenuTimeout() {
        AppDisplay.AppIcon.prototype._removeMenuTimeout.apply(this, arguments);
    }

    popupMenu() {
        this._removeMenuTimeout();
        this.actor.fake_release();

        if (!this._menu) {
            this._menu = new MyShowAppsIconMenu(this);
            this._menu.connect('open-state-changed', (menu, isPoppedUp) => {
                if (!isPoppedUp)
                    this._onMenuPoppedDown();
            });
            let id = Main.overview.connect('hiding', () => {
                this._menu.close();
            });
            this._menu.actor.connect('destroy', function() {
                Main.overview.disconnect(id);
            });
            this._menuManager.addMenu(this._menu);
        }

        this.emit('menu-state-changed', true);

        this.actor.set_hover(true);
        this._menu.popup();
        this._menuManager.ignoreRelease();
        this.emit('sync-tooltip');

        return false;
    }
});


/**
 * A menu for the showAppsIcon
 */
var MyShowAppsIconMenu = class DashToDock_MyShowAppsIconMenu extends MyAppIconMenu {
    _redisplay() {
        this.removeAll();

        /* Translators: %s is "Settings", which is automatically translated. You
           can also translate the full message if this fits better your language. */
        let name = __('Dash to Dock %s').format(_('Settings'))
        let item = this._appendMenuItem(name);

        item.connect('activate', function () {
            Util.spawn(["gnome-shell-extension-prefs", Me.metadata.uuid]);
        });
    }
};

/**
 * This function is used for both extendShowAppsIcon and extendDashItemContainer
 */
function itemShowLabel()  {
    // Check if the label is still present at all. When switching workpaces, the
    // item might have been destroyed in between.
    if (!this._labelText || this.label.get_stage() == null)
      return;

    this.label.set_text(this._labelText);
    this.label.opacity = 0;
    this.label.show();

    let [stageX, stageY] = this.get_transformed_position();
    let node = this.label.get_theme_node();

    let itemWidth  = this.allocation.x2 - this.allocation.x1;
    let itemHeight = this.allocation.y2 - this.allocation.y1;

    let labelWidth = this.label.get_width();
    let labelHeight = this.label.get_height();

    let x, y, xOffset, yOffset;

    let position = Utils.getPosition();
    this._isHorizontal = ((position == St.Side.TOP) || (position == St.Side.BOTTOM));
    let labelOffset = node.get_length('-x-offset');

    switch (position) {
    case St.Side.LEFT:
        yOffset = Math.floor((itemHeight - labelHeight) / 2);
        y = stageY + yOffset;
        xOffset = labelOffset;
        x = stageX + this.get_width() + xOffset;
        break;
    case St.Side.RIGHT:
        yOffset = Math.floor((itemHeight - labelHeight) / 2);
        y = stageY + yOffset;
        xOffset = labelOffset;
        x = Math.round(stageX) - labelWidth - xOffset;
        break;
    case St.Side.TOP:
        y = stageY + labelOffset + itemHeight;
        xOffset = Math.floor((itemWidth - labelWidth) / 2);
        x = stageX + xOffset;
        break;
    case St.Side.BOTTOM:
        yOffset = labelOffset;
        y = stageY - labelHeight - yOffset;
        xOffset = Math.floor((itemWidth - labelWidth) / 2);
        x = stageX + xOffset;
        break;
    }

    // keep the label inside the screen border
    // Only needed fot the x coordinate.

    // Leave a few pixel gap
    let gap = 5;
    let monitor = Main.layoutManager.findMonitorForActor(this);
    if (x - monitor.x < gap)
        x += monitor.x - x + labelOffset;
    else if (x + labelWidth > monitor.x + monitor.width - gap)
        x -= x + labelWidth - (monitor.x + monitor.width) + gap;

    this.label.remove_all_transitions();
    this.label.set_position(x, y);
    this.label.ease({
        opacity: 255,
        duration: Dash.DASH_ITEM_LABEL_SHOW_TIME,
        mode: Clutter.AnimationMode.EASE_OUT_QUAD
    });
}