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

const Atk = imports.gi.Atk;
const GLib = imports.gi.GLib;
const GObject = imports.gi.GObject;
const Gio = imports.gi.Gio;
const Lang = imports.lang;
const Shell = imports.gi.Shell;
const ShellMenu = imports.gi.ShellMenu;
const St = imports.gi.St;

const PopupMenu = imports.ui.popupMenu;

function stripMnemonics(label) {
    if (!label)
        return '';

    // remove all underscores that are not followed by another underscore
    return label.replace(/_([^_])/, '$1');
}

function _insertItem(menu, trackerItem, position) {
    let mapper;

    if (trackerItem.get_is_separator())
        mapper = new RemoteMenuSeparatorItemMapper(trackerItem);
    else if (trackerItem.get_has_submenu())
        mapper = new RemoteMenuSubmenuItemMapper(trackerItem);
    else
        mapper = new RemoteMenuItemMapper(trackerItem);

    let item = mapper.menuItem;
    menu.addMenuItem(item, position);
}

function _removeItem(menu, position) {
    let items = menu._getMenuItems();
    items[position].destroy();
}

var RemoteMenuSeparatorItemMapper = new Lang.Class({
    Name: 'RemoteMenuSeparatorItemMapper',

    _init(trackerItem) {
        this._trackerItem = trackerItem;
        this.menuItem = new PopupMenu.PopupSeparatorMenuItem();
        this._trackerItem.connect('notify::label', this._updateLabel.bind(this));
        this._updateLabel();

        this.menuItem.connect('destroy', () => {
            trackerItem.run_dispose();
        });
    },

    _updateLabel() {
        this.menuItem.label.text = stripMnemonics(this._trackerItem.label);
    },
});

var RequestSubMenu = new Lang.Class({
    Name: 'RequestSubMenu',
    Extends: PopupMenu.PopupSubMenuMenuItem,

    _init() {
        this.parent('');
        this._requestOpen = false;
    },

    _setOpenState(open) {
        this.emit('request-open', open);
        this._requestOpen = open;
    },

    _getOpenState() {
        return this._requestOpen;
    },
});

var RemoteMenuSubmenuItemMapper = new Lang.Class({
    Name: 'RemoteMenuSubmenuItemMapper',

    _init(trackerItem) {
        this._trackerItem = trackerItem;
        this.menuItem = new RequestSubMenu();
        this._trackerItem.connect('notify::label', this._updateLabel.bind(this));
        this._updateLabel();

        this._tracker = Shell.MenuTracker.new_for_item_submenu(this._trackerItem,
                                                               _insertItem.bind(null, this.menuItem.menu),
                                                               _removeItem.bind(null, this.menuItem.menu));

        this.menuItem.connect('request-open', (menu, open) => {
            this._trackerItem.request_submenu_shown(open);
        });

        this._trackerItem.connect('notify::submenu-shown', () => {
            this.menuItem.setSubmenuShown(this._trackerItem.get_submenu_shown());
        });

        this.menuItem.connect('destroy', () => {
            trackerItem.run_dispose();
        });
    },

    destroy() {
        this._tracker.destroy();
        this.parent();
    },

    _updateLabel() {
        this.menuItem.label.text = stripMnemonics(this._trackerItem.label);
    },
});

var RemoteMenuItemMapper = new Lang.Class({
    Name: 'RemoteMenuItemMapper',

    _init(trackerItem) {
        this._trackerItem = trackerItem;

        this.menuItem = new PopupMenu.PopupBaseMenuItem();
        this._label = new St.Label();
        this.menuItem.actor.add_child(this._label);
        this.menuItem.actor.label_actor = this._label;

        this.menuItem.connect('activate', () => {
            this._trackerItem.activated();
        });

        this._trackerItem.bind_property('visible', this.menuItem.actor, 'visible', GObject.BindingFlags.SYNC_CREATE);

        this._trackerItem.connect('notify::label', this._updateLabel.bind(this));
        this._trackerItem.connect('notify::sensitive', this._updateSensitivity.bind(this));
        this._trackerItem.connect('notify::role', this._updateRole.bind(this));
        this._trackerItem.connect('notify::toggled', this._updateDecoration.bind(this));

        this._updateLabel();
        this._updateSensitivity();
        this._updateRole();

        this.menuItem.connect('destroy', () => {
            trackerItem.run_dispose();
        });
    },

    _updateLabel() {
        this._label.text = stripMnemonics(this._trackerItem.label);
    },

    _updateSensitivity() {
        this.menuItem.setSensitive(this._trackerItem.sensitive);
    },

    _updateDecoration() {
        let ornamentForRole = {};
        ornamentForRole[ShellMenu.MenuTrackerItemRole.RADIO] = PopupMenu.Ornament.DOT;
        ornamentForRole[ShellMenu.MenuTrackerItemRole.CHECK] = PopupMenu.Ornament.CHECK;

        let ornament = PopupMenu.Ornament.NONE;
        if (this._trackerItem.toggled)
            ornament = ornamentForRole[this._trackerItem.role];

        this.menuItem.setOrnament(ornament);
    },

    _updateRole() {
        let a11yRoles = {};
        a11yRoles[ShellMenu.MenuTrackerItemRole.NORMAL] = Atk.Role.MENU_ITEM;
        a11yRoles[ShellMenu.MenuTrackerItemRole.RADIO] = Atk.Role.RADIO_MENU_ITEM;
        a11yRoles[ShellMenu.MenuTrackerItemRole.CHECK] = Atk.Role.CHECK_MENU_ITEM;

        let a11yRole = a11yRoles[this._trackerItem.role];
        this.menuItem.actor.accessible_role = a11yRole;

        this._updateDecoration();
    },
});

var RemoteMenu = new Lang.Class({
    Name: 'RemoteMenu',
    Extends: PopupMenu.PopupMenu,

    _init(sourceActor, model, actionGroup) {
        this.parent(sourceActor, 0.0, St.Side.TOP);

        this._model = model;
        this._actionGroup = actionGroup;
        this._tracker = Shell.MenuTracker.new(this._actionGroup,
                                              this._model,
                                              null, /* action namespace */
                                              _insertItem.bind(null, this),
                                              _removeItem.bind(null, this));
    },

    get actionGroup() {
        return this._actionGroup;
    },

    destroy() {
        this._tracker.destroy();
        this.parent();
    },
});