// This file is part of the AppIndicator/KStatusNotifierItem GNOME Shell extension
//
// 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.

import * as Extension from 'resource:///org/gnome/shell/extensions/extension.js';

import * as StatusNotifierWatcher from './statusNotifierWatcher.js';
import * as Interfaces from './interfaces.js';
import * as TrayIconsManager from './trayIconsManager.js';
import * as Util from './util.js';
import {Logger} from './logger.js';
import {SettingsManager} from './settingsManager.js';

export default class AppIndicatorExtension extends Extension.Extension {
    constructor(...args) {
        super(...args);

        Logger.init(this);
        Interfaces.initialize(this);

        this._isEnabled = false;
        this._statusNotifierWatcher = null;
        this._watchDog = new Util.NameWatcher(StatusNotifierWatcher.WATCHER_BUS_NAME);
        this._watchDogId = this._watchDog.connect('vanished',
            () => this._maybeEnableAfterNameAvailable());

        // HACK: we want to leave the watchdog alive when disabling the extension,
        // but if we are being reloaded, we destroy it since it could be considered
        // a leak and spams our log, too.
        /* eslint-disable no-undef */
        if (typeof global['--appindicator-extension-on-reload'] === 'function')
            global['--appindicator-extension-on-reload']();

        global['--appindicator-extension-on-reload'] = () => {
            Logger.debug('Reload detected, destroying old watchdog');
            this._watchDog.disconnect(this._watchDogId);
            this._watchDog.destroy();
            this._watchDog = null;
        };
        /* eslint-enable no-undef */
    }

    enable() {
        this._isEnabled = true;
        SettingsManager.initialize(this);
        Util.tryCleanupOldIndicators();
        this._maybeEnableAfterNameAvailable();
        TrayIconsManager.TrayIconsManager.initialize();
    }

    disable() {
        this._isEnabled = false;
        TrayIconsManager.TrayIconsManager.destroy();

        if (this._statusNotifierWatcher !== null) {
            this._statusNotifierWatcher.destroy();
            this._statusNotifierWatcher = null;
        }

        SettingsManager.destroy();
    }

    // FIXME: when entering/leaving the lock screen, the extension might be
    // enabled/disabled rapidly.
    // This will create very bad side effects in case we were not done unowning
    // the name while trying to own it again. Since g_bus_unown_name doesn't
    // fire any callback when it's done, we need to monitor the bus manually
    // to find out when the name vanished so we can reclaim it again.
    _maybeEnableAfterNameAvailable() {
        // by the time we get called whe might not be enabled
        if (!this._isEnabled || this._statusNotifierWatcher)
            return;

        if (this._watchDog.nameAcquired && this._watchDog.nameOnBus)
            return;

        this._statusNotifierWatcher = new StatusNotifierWatcher.StatusNotifierWatcher(
            this, this._watchDog);
    }
}
