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

const Clutter = imports.gi.Clutter;
const Gio = imports.gi.Gio;
const GLib = imports.gi.GLib;
const Gtk = imports.gi.Gtk;
const GMenu = imports.gi.GMenu;
const Shell = imports.gi.Shell;
const Lang = imports.lang;
const Signals = imports.signals;
const Meta = imports.gi.Meta;
const St = imports.gi.St;
const Mainloop = imports.mainloop;
const Atk = imports.gi.Atk;

const AppFavorites = imports.ui.appFavorites;
const DND = imports.ui.dnd;
const IconGrid = imports.ui.iconGrid;
const Main = imports.ui.main;
const Overview = imports.ui.overview;
const PopupMenu = imports.ui.popupMenu;
const Tweener = imports.ui.tweener;
const Workspace = imports.ui.workspace;
const Params = imports.misc.params;
const Util = imports.misc.util;

const MAX_APPLICATION_WORK_MILLIS = 75;
const MENU_POPUP_TIMEOUT = 600;
const SCROLL_TIME = 0.1;

const AlphabeticalView = new Lang.Class({
    Name: 'AlphabeticalView',

    _init: function() {
        this._grid = new IconGrid.IconGrid({ xAlign: St.Align.START });
        this._appSystem = Shell.AppSystem.get_default();

        this._pendingAppLaterId = 0;
        this._appIcons = {}; // desktop file id
        this._allApps = [];

        let box = new St.BoxLayout({ vertical: true });
        box.add(this._grid.actor, { y_align: St.Align.START, expand: true });

        this.actor = new St.ScrollView({ x_fill: true,
                                         y_fill: false,
                                         y_align: St.Align.START,
                                         style_class: 'vfade' });
        this.actor.add_actor(box);
        this.actor.set_policy(Gtk.PolicyType.NEVER, Gtk.PolicyType.AUTOMATIC);
        let action = new Clutter.PanAction({ interpolate: true });
        action.connect('pan', Lang.bind(this, this._onPan));
        this.actor.add_action(action);
    },

    _onPan: function(action) {
        let [dist, dx, dy] = action.get_motion_delta(0);
        let adjustment = this.actor.vscroll.adjustment;
        adjustment.value -= (dy / this.actor.height) * adjustment.page_size;
        return false;
    },

    removeAll: function() {
        this._grid.removeAll();
        this._appIcons = {};
        this._allApps = [];
    },

    addApp: function(app) {
        var id = app.get_id();
        if (this._appIcons[id] !== undefined)
            return;

        let appIcon = new AppWellIcon(app);
        let pos = Util.insertSorted(this._allApps, app, function(a, b) {
            return a.compare_by_name(b);
        });
        this._grid.addItem(appIcon.actor, pos);
        appIcon.actor.connect('key-focus-in', Lang.bind(this, this._ensureIconVisible));

        this._appIcons[id] = appIcon;
    },

    _ensureIconVisible: function(icon) {
        let adjustment = this.actor.vscroll.adjustment;
        let [value, lower, upper, stepIncrement, pageIncrement, pageSize] = adjustment.get_values();

        let offset = 0;
        let vfade = this.actor.get_effect("vfade");
        if (vfade)
            offset = vfade.fade_offset;

        // If this gets called as part of a right-click, the actor
        // will be needs_allocation, and so "icon.y" would return 0
        let box = icon.get_allocation_box();

        if (box.y1 < value + offset)
            value = Math.max(0, box.y1 - offset);
        else if (box.y2 > value + pageSize - offset)
            value = Math.min(upper, box.y2 + offset - pageSize);
        else
            return;

        Tweener.addTween(adjustment,
                         { value: value,
                           time: SCROLL_TIME,
                           transition: 'easeOutQuad' });
    },

    setVisibleApps: function(apps) {
        if (apps == null) { // null implies "all"
            for (var id in this._appIcons) {
                var icon = this._appIcons[id];
                icon.actor.visible = true;
            }
        } else {
            // Set everything to not-visible, then set to visible what we should see
            for (var id in this._appIcons) {
                var icon = this._appIcons[id];
                icon.actor.visible = false;
            }
            for (var i = 0; i < apps.length; i++) {
                var app = apps[i];
                var id = app.get_id();
                var icon = this._appIcons[id];
                icon.actor.visible = true;
            }
        }
    }
});

const ViewByCategories = new Lang.Class({
    Name: 'ViewByCategories',

    _init: function() {
        this._appSystem = Shell.AppSystem.get_default();
        this.actor = new St.BoxLayout({ style_class: 'all-app' });
        this.actor._delegate = this;

        this._view = new AlphabeticalView();

        // categories can be -1 (the All view) or 0...n-1, where n
        // is the number of sections
        // -2 is a flag to indicate that nothing is selected
        // (used only before the actor is mapped the first time)
        this._currentCategory = -2;
        this._categories = [];

        this._categoryBox = new St.BoxLayout({ vertical: true,
                                               reactive: true,
                                               accessible_role: Atk.Role.LIST });
        this._categoryScroll = new St.ScrollView({ x_fill: false,
                                                   y_fill: false,
                                                   style_class: 'vfade' });
        this._categoryScroll.add_actor(this._categoryBox);
        this._categoryScroll.set_policy(Gtk.PolicyType.NEVER, Gtk.PolicyType.AUTOMATIC);
        this.actor.add(this._view.actor, { expand: true, x_fill: true, y_fill: true });
        this.actor.add(this._categoryScroll, { expand: false, y_fill: false, y_align: St.Align.START });

        // Always select the "All" filter when switching to the app view
        this.actor.connect('notify::mapped', Lang.bind(this,
            function() {
                if (this.actor.mapped && this._allCategoryButton)
                    this._selectCategory(-1);
            }));

        // We need a dummy actor to catch the keyboard focus if the
        // user Ctrl-Alt-Tabs here before the deferred work creates
        // our real contents
        this._focusDummy = new St.Bin({ can_focus: true });
        this.actor.add(this._focusDummy);
    },

    _selectCategory: function(num) {
        if (this._currentCategory == num) // nothing to do
            return;

        this._currentCategory = num;

        if (num != -1) {
            var category = this._categories[num];
            this._allCategoryButton.remove_style_pseudo_class('selected');
            this._view.setVisibleApps(category.apps);
        } else {
            this._allCategoryButton.add_style_pseudo_class('selected');
            this._view.setVisibleApps(null);
        }

        for (var i = 0; i < this._categories.length; i++) {
            if (i == num)
                this._categories[i].button.add_style_pseudo_class('selected');
            else
                this._categories[i].button.remove_style_pseudo_class('selected');
        }
    },

    // Recursively load a GMenuTreeDirectory; we could put this in ShellAppSystem too
    _loadCategory: function(dir, appList) {
        var iter = dir.iter();
        var nextType;
        while ((nextType = iter.next()) != GMenu.TreeItemType.INVALID) {
            if (nextType == GMenu.TreeItemType.ENTRY) {
                var entry = iter.get_entry();
                var app = this._appSystem.lookup_app_by_tree_entry(entry);
                if (!entry.get_app_info().get_nodisplay()) {
                    this._view.addApp(app);
                    appList.push(app);
                }
            } else if (nextType == GMenu.TreeItemType.DIRECTORY) {
                var itemDir = iter.get_directory();
                if (!itemDir.get_is_nodisplay())
                    this._loadCategory(itemDir, appList);
            }
        }
    },

    _addCategory: function(name, index, dir) {
        let apps;

        if (dir != null) {
            apps = [];
            this._loadCategory(dir, apps);

            if (apps.length == 0)
                return false;
        }

        let button = new St.Button({ label: GLib.markup_escape_text (name, -1),
                                     style_class: 'app-filter',
                                     x_align: St.Align.START,
                                     can_focus: true ,
                                     accessible_role: Atk.Role.LIST_ITEM });
        button.connect('clicked', Lang.bind(this, function() {
            this._selectCategory(index);
        }));

        if (dir == null) {
            this._allCategoryButton = button;
        } else {
            this._categories.push({ apps: apps,
                                    name: name,
                                    button: button });
        }

        this._categoryBox.add(button, { expand: true, x_fill: true, y_fill: false });
        return true;
    },

    _removeAll: function() {
        this._view.removeAll();
        this._categories = [];
        this._categoryBox.destroy_all_children();
    },

    refresh: function() {
        this._removeAll();

        /* Translators: Filter to display all applications */
        this._addCategory(_("All"), -1, null);

        var tree = this._appSystem.get_tree();
        var root = tree.get_root_directory();

        var iter = root.iter();
        var nextType;
        var i = 0;
        while ((nextType = iter.next()) != GMenu.TreeItemType.INVALID) {
            if (nextType == GMenu.TreeItemType.DIRECTORY) {
                var dir = iter.get_directory();
                if (dir.get_is_nodisplay())
                    continue;

                if (this._addCategory(dir.get_name(), i, dir))
                    i++;
            }
        }

        this._selectCategory(-1);

        if (this._focusDummy) {
            let focused = this._focusDummy.has_key_focus();
            this._focusDummy.destroy();
            this._focusDummy = null;
            if (focused)
                this.actor.navigate_focus(null, Gtk.DirectionType.TAB_FORWARD, false);
        }
    }
});

/* This class represents a display containing a collection of application items.
 * The applications are sorted based on their name.
 */
const AllAppDisplay = new Lang.Class({
    Name: 'AllAppDisplay',

    _init: function() {
        this._appSystem = Shell.AppSystem.get_default();
        this._appSystem.connect('installed-changed', Lang.bind(this, function() {
            Main.queueDeferredWork(this._workId);
        }));

        this._appView = new ViewByCategories();
        this.actor = new St.Bin({ child: this._appView.actor, x_fill: true, y_fill: true });

        this._workId = Main.initializeDeferredWork(this.actor, Lang.bind(this, this._redisplay));
    },

    _redisplay: function() {
        this._appView.refresh();
    }
});

const AppSearchProvider = new Lang.Class({
    Name: 'AppSearchProvider',

    _init: function() {
        this._appSys = Shell.AppSystem.get_default();
        this.id = 'applications';
    },

    getResultMetas: function(apps, callback) {
        let metas = [];
        for (let i = 0; i < apps.length; i++) {
            let app = apps[i];
            metas.push({ 'id': app,
                         'name': app.get_name(),
                         'createIcon': function(size) {
                             return app.create_icon_texture(size);
                         }
                       });
        }
        callback(metas);
    },

    getInitialResultSet: function(terms) {
        this.searchSystem.pushResults(this, this._appSys.initial_search(terms));
    },

    getSubsearchResultSet: function(previousResults, terms) {
        this.searchSystem.pushResults(this, this._appSys.subsearch(previousResults, terms));
    },

    activateResult: function(app) {
        let event = Clutter.get_current_event();
        let modifiers = event ? event.get_state() : 0;
        let openNewWindow = modifiers & Clutter.ModifierType.CONTROL_MASK;

        if (openNewWindow)
            app.open_new_window(-1);
        else
            app.activate();
    },

    dragActivateResult: function(id, params) {
        params = Params.parse(params, { workspace: -1,
                                        timestamp: 0 });

        let app = this._appSys.lookup_app(id);
        app.open_new_window(workspace);
    },

    createResultActor: function (resultMeta, terms) {
        let app = resultMeta['id'];
        let icon = new AppWellIcon(app);
        return icon.actor;
    }
});

const AppIcon = new Lang.Class({
    Name: 'AppIcon',
    Extends: IconGrid.BaseIcon,

    _init : function(app, params) {
        this.app = app;

        let label = this.app.get_name();

        this.parent(label, params);
    },

    createIcon: function(iconSize) {
        return this.app.create_icon_texture(iconSize);
    }
});

const AppWellIcon = new Lang.Class({
    Name: 'AppWellIcon',

    _init : function(app, iconParams, onActivateOverride) {
        this.app = app;
        this.actor = new St.Button({ style_class: 'app-well-app',
                                     reactive: true,
                                     button_mask: St.ButtonMask.ONE | St.ButtonMask.TWO,
                                     can_focus: true,
                                     x_fill: true,
                                     y_fill: true });
        this.actor._delegate = this;

        this.icon = new AppIcon(app, iconParams);
        this.actor.set_child(this.icon.actor);

        this.actor.label_actor = this.icon.label;

        // A function callback to override the default "app.activate()"; used by preferences
        this._onActivateOverride = onActivateOverride;
        this.actor.connect('button-press-event', Lang.bind(this, this._onButtonPress));
        this.actor.connect('clicked', Lang.bind(this, this._onClicked));
        this.actor.connect('popup-menu', Lang.bind(this, this._onKeyboardPopupMenu));

        this._menu = null;
        this._menuManager = new PopupMenu.PopupMenuManager(this);

        this._draggable = DND.makeDraggable(this.actor);
        this._draggable.connect('drag-begin', Lang.bind(this,
            function () {
                this._removeMenuTimeout();
                Main.overview.beginItemDrag(this);
            }));
        this._draggable.connect('drag-cancelled', Lang.bind(this,
            function () {
                Main.overview.cancelledItemDrag(this);
            }));
        this._draggable.connect('drag-end', Lang.bind(this,
            function () {
               Main.overview.endItemDrag(this);
            }));

        this.actor.connect('destroy', Lang.bind(this, this._onDestroy));

        this._menuTimeoutId = 0;
        this._stateChangedId = this.app.connect('notify::state',
                                                Lang.bind(this,
                                                          this._onStateChanged));
        this._onStateChanged();
    },

    _onDestroy: function() {
        if (this._stateChangedId > 0)
            this.app.disconnect(this._stateChangedId);
        this._stateChangedId = 0;
        this._removeMenuTimeout();
    },

    _removeMenuTimeout: function() {
        if (this._menuTimeoutId > 0) {
            Mainloop.source_remove(this._menuTimeoutId);
            this._menuTimeoutId = 0;
        }
    },

    _onStateChanged: function() {
        if (this.app.state != Shell.AppState.STOPPED)
            this.actor.add_style_class_name('running');
        else
            this.actor.remove_style_class_name('running');
    },

    _onButtonPress: function(actor, event) {
        let button = event.get_button();
        if (button == 1) {
            this._removeMenuTimeout();
            this._menuTimeoutId = Mainloop.timeout_add(MENU_POPUP_TIMEOUT,
                Lang.bind(this, function() {
                    this.popupMenu();
                }));
        } else if (button == 3) {
            this.popupMenu();
            return true;
        }
        return false;
    },

    _onClicked: function(actor, button) {
        this._removeMenuTimeout();

        if (button == 1) {
            this._onActivate(Clutter.get_current_event());
        } else if (button == 2) {
            // Last workspace is always empty
            let launchWorkspace = global.screen.get_workspace_by_index(global.screen.n_workspaces - 1);
            launchWorkspace.activate(global.get_current_time());
            this.emit('launching');
            this.app.open_new_window(-1);
            Main.overview.hide();
        }
        return false;
    },

    _onKeyboardPopupMenu: function() {
        this.popupMenu();
        this._menu.actor.navigate_focus(null, Gtk.DirectionType.TAB_FORWARD, false);
    },

    getId: function() {
        return this.app.get_id();
    },

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

        if (!this._menu) {
            this._menu = new AppIconMenu(this);
            this._menu.connect('activate-window', Lang.bind(this, function (menu, window) {
                this.activateWindow(window);
            }));
            this._menu.connect('open-state-changed', Lang.bind(this, function (menu, isPoppedUp) {
                if (!isPoppedUp)
                    this._onMenuPoppedDown();
            }));
            Main.overview.connect('hiding', Lang.bind(this, function () { this._menu.close(); }));

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

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

        this.actor.set_hover(true);
        this._menu.popup();
        this._menuManager.ignoreRelease();

        return false;
    },

    activateWindow: function(metaWindow) {
        if (metaWindow) {
            Main.activateWindow(metaWindow);
        } else {
            Main.overview.hide();
        }
    },

    _onMenuPoppedDown: function() {
        this.actor.sync_hover();
        this.emit('menu-state-changed', false);
    },

    _onActivate: function (event) {
        this.emit('launching');
        let modifiers = event.get_state();

        if (this._onActivateOverride) {
            this._onActivateOverride(event);
        } else {
            if (modifiers & Clutter.ModifierType.CONTROL_MASK
                && this.app.state == Shell.AppState.RUNNING) {
                this.app.open_new_window(-1);
            } else {
                this.app.activate();
            }
        }
        Main.overview.hide();
    },

    shellWorkspaceLaunch : function(params) {
        params = Params.parse(params, { workspace: -1,
                                        timestamp: 0 });

        this.app.open_new_window(params.workspace);
    },

    getDragActor: function() {
        return this.app.create_icon_texture(Main.overview.dashIconSize);
    },

    // Returns the original actor that should align with the actor
    // we show as the item is being dragged.
    getDragActorSource: function() {
        return this.icon.icon;
    }
});
Signals.addSignalMethods(AppWellIcon.prototype);

const AppIconMenu = new Lang.Class({
    Name: 'AppIconMenu',
    Extends: PopupMenu.PopupMenu,

    _init: function(source) {
        let side = St.Side.LEFT;
        if (Clutter.get_default_text_direction() == Clutter.TextDirection.RTL)
            side = St.Side.RIGHT;

        this.parent(source.actor, 0.5, side);

        // We want to keep the item hovered while the menu is up
        this.blockSourceEvents = true;

        this._source = source;

        this.connect('activate', Lang.bind(this, this._onActivate));

        this.actor.add_style_class_name('app-well-menu');

        // Chain our visibility and lifecycle to that of the source
        source.actor.connect('notify::mapped', Lang.bind(this, function () {
            if (!source.actor.mapped)
                this.close();
        }));
        source.actor.connect('destroy', Lang.bind(this, function () { this.actor.destroy(); }));

        Main.uiGroup.add_actor(this.actor);
    },

    _redisplay: function() {
        this.removeAll();

        let windows = this._source.app.get_windows();

        // Display the app windows menu items and the separator between windows
        // of the current desktop and other windows.
        let activeWorkspace = global.screen.get_active_workspace();
        let separatorShown = windows.length > 0 && windows[0].get_workspace() != activeWorkspace;

        for (let i = 0; i < windows.length; i++) {
            if (!separatorShown && windows[i].get_workspace() != activeWorkspace) {
                this._appendSeparator();
                separatorShown = true;
            }
            let item = this._appendMenuItem(windows[i].title);
            item._window = windows[i];
        }

        if (!this._source.app.is_window_backed()) {
            if (windows.length > 0)
                this._appendSeparator();

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

            this._newWindowMenuItem = this._appendMenuItem(_("New Window"));
            this._appendSeparator();

            this._toggleFavoriteMenuItem = this._appendMenuItem(isFavorite ? _("Remove from Favorites")
                                                                : _("Add to Favorites"));
        }
    },

    _appendSeparator: function () {
        let separator = new PopupMenu.PopupSeparatorMenuItem();
        this.addMenuItem(separator);
    },

    _appendMenuItem: function(labelText) {
        // FIXME: app-well-menu-item style
        let item = new PopupMenu.PopupMenuItem(labelText);
        this.addMenuItem(item);
        return item;
    },

    popup: function(activatingButton) {
        this._redisplay();
        this.open();
    },

    _onActivate: function (actor, child) {
        if (child._window) {
            let metaWindow = child._window;
            this.emit('activate-window', metaWindow);
        } else if (child == this._newWindowMenuItem) {
            this._source.app.open_new_window(-1);
            this.emit('activate-window', null);
        } else if (child == this._toggleFavoriteMenuItem) {
            let favs = AppFavorites.getAppFavorites();
            let isFavorite = favs.isFavorite(this._source.app.get_id());
            if (isFavorite)
                favs.removeFavorite(this._source.app.get_id());
            else
                favs.addFavorite(this._source.app.get_id());
        }
        this.close();
    }
});
Signals.addSignalMethods(AppIconMenu.prototype);