import Clutter from 'gi://Clutter';
import GLib from 'gi://GLib';
import GObject from 'gi://GObject';
import Gio from 'gi://Gio';
import St from 'gi://St';
import Shell from 'gi://Shell';
import GTop from 'gi://GTop';

import * as Main from 'resource:///org/gnome/shell/ui/main.js';
import * as PanelMenu from 'resource:///org/gnome/shell/ui/panelMenu.js';
import * as PopupMenu from 'resource:///org/gnome/shell/ui/popupMenu.js';
import * as ModalDialog from 'resource:///org/gnome/shell/ui/modalDialog.js';
import {Extension, gettext as _} from 'resource:///org/gnome/shell/extensions/extension.js';

let debugOutput = false;
let pingDepsGtop = true;

function print_info(str) {
    log('[Ping monitor INFO] ' + str);
}

function print_debug(str) {
    if (debugOutput) {
        log('[Ping monitor DEBUG] ' + str);
    }
}

function color_from_string(color) {
    let clutterColor = new Clutter.Color();
    clutterColor = Clutter.Color.from_string(color)[1];
    return clutterColor;
}

const PingStyleManager = class PingMonitor_PingStyleManager {
    constructor() {
        print_debug('pingStyleManager constructor()');

        this._extension = '';
        this._iconsize = 1;
        this._text_scaling = 1;

        let interfaceSettings = new Gio.Settings({
            schema: 'org.gnome.desktop.interface'
        });
        this._text_scaling = interfaceSettings.get_double('text-scaling-factor');
        if (!this._text_scaling) {
            this._text_scaling = 1;
        }
    }

    get(style) {
        return style + this._extension;
    }

    text_scaling() {
        return this._text_scaling;
    }
};

const PingDialog = GObject.registerClass(
class PingDialog extends ModalDialog.ModalDialog {
    _init() {
        super._init({styleClass: 'prompt-dialog'});

        print_debug('PingDialog construct()');

        let mainContentBox = new St.BoxLayout({
            style_class: 'prompt-dialog-main-layout',
            vertical: false
        });
        this.contentLayout.add_child(mainContentBox);

        let messageBox = new St.BoxLayout({
            style_class: 'prompt-dialog-message-layout',
            vertical: true
        });
        mainContentBox.add_child(messageBox);

        this._subjectLabel = new St.Label({
            style_class: 'prompt-dialog-headline',
            text: _('Ping Monitor Extension')
        });

        messageBox.add_child(this._subjectLabel);

        const MESSAGE = _('Dependencies Missing\n\
Please install: \n\
libgtop and gir bindings\n\
\t    on Ubuntu: gir1.2-gtop-2.0\n\
\t    on Fedora: libgtop2-devel\n\
\t    on Arch: libgtop\n\
\t    on openSUSE: typelib-1_0-GTop-2_0\n');

        this._descriptionLabel = new St.Label({
            style_class: 'prompt-dialog-description',
            text: MESSAGE
        });

        messageBox.add_child(this._descriptionLabel);

        this.setButtons([{
            label: _('Cancel'),
            action: () => {
                this.close();
            },
            key: Clutter.KEY_Escape
        }]);
    }
});

const StatusSquare = class PingMonitor_StatusSquare {
    constructor(height, parent) {
        print_debug('StatusSquare constructor()');

        this._width = 12;
        this._height = 12;
        this._color = '#ff0000';
        this._activityState = 0;
        this._isPingUpdate = false;

        this.actor = new St.Widget({
            style_class: 'ping-chart',
            reactive: false,
            width: this._width,
            height: this._height,
            y_align: Clutter.ActorAlign.CENTER,
            y_expand: false
        });

        this.parentC = parent;
        this.data = [];
        this._updateStyle();
    }

    update(color, isPingUpdate) {
        print_debug('StatusSquare update()');

        this._color = color;
        this._isPingUpdate = isPingUpdate;

        if (!this.actor.visible) {
            return;
        }

        if (this._isPingUpdate) {
            this._activityState = (this._activityState + 1) % 4;
        }

        this._updateStyle();
    }

    _updateStyle() {
        print_debug('StatusSquare _updateStyle()');

        if (!this.actor.visible) {
            return;
        }

        this.actor.set_style(`
            background-color: ${this._color};
            border-radius: 2px;
            width: ${this._width}px;
            height: ${this._height}px;
            min-width: ${this._width}px;
            min-height: ${this._height}px;
        `);
    }

    resize(schema, key) {
        print_debug('StatusSquare resize()');
    }
};

const PingTipItem = GObject.registerClass(
class PingTipItem extends PopupMenu.PopupBaseMenuItem {
    _init() {
        super._init();
        this.remove_style_class_name('popup-menu-item');
        this.add_style_class_name('ping-tooltip-item');
    }
});

const TipMenu = class PingMonitor_TipMenu extends PopupMenu.PopupMenuBase {
    constructor(sourceActor) {
        print_debug('TipMenu constructor()');
        super(sourceActor, 'ping-tooltip-box');
        this.actor = new Clutter.Actor();
        this.actor.add_child(this.box);
    }

    _shift() {
        print_debug('TipMenu _shift()');

        let node = this.sourceActor.get_theme_node();
        let contentbox = node.get_content_box(this.sourceActor.get_allocation_box());
        let allocation = Shell.util_get_transformed_allocation(this.sourceActor);
        let monitor = Main.layoutManager.findMonitorForActor(this.sourceActor);
        let [x, y] = [allocation.x1 + contentbox.x1,
            allocation.y1 + contentbox.y1];
        let [cx, cy] = [allocation.x1 + (contentbox.x1 + contentbox.x2) / 2,
            allocation.y1 + (contentbox.y1 + contentbox.y2) / 2];
        let [xm, ym] = [allocation.x1 + contentbox.x2,
            allocation.y1 + contentbox.y2];
        let [width, height] = this.actor.get_size();
        let tipx = cx - width / 2;
        tipx = Math.max(tipx, monitor.x);
        tipx = Math.min(tipx, monitor.x + monitor.width - width);
        let tipy = Math.floor(ym);

        if (allocation.y1 / monitor.height > 0.3) {
            tipy = allocation.y1 - height;
        }
        this.actor.set_position(tipx, tipy);
    }

    open(animate) {
        print_debug('TipMenu open()');

        if (this.isOpen) {
            return;
        }

        this.isOpen = true;
        this.actor.show();
        this._shift();
        this.actor.get_parent()?.set_child_above_sibling(this.actor, null);
        this.emit('open-state-changed', true);
    }

    close(animate) {
        print_debug('TipMenu close()');

        this.isOpen = false;
        this.actor.hide();
        this.emit('open-state-changed', false);
    }
};

const TipBox = class PingMonitor_TipBox {
    constructor() {
        print_debug('TipBox constructor()');

        this.show_tooltip = true;
        this.actor = new St.BoxLayout({
            reactive: true,
            y_align: Clutter.ActorAlign.CENTER
        });
        this.actor._delegate = this;
        this.set_tip(new TipMenu(this.actor));
        this.in_to = this.out_to = 0;
        this.actor.connect('enter-event', this.on_enter.bind(this));
        this.actor.connect('leave-event', this.on_leave.bind(this));
    }

    set_tip(tipmenu) {
        print_debug('TipBox set_tip()');

        if (this.tipmenu) {
            this.tipmenu.destroy();
        }
        this.tipmenu = tipmenu;
        if (this.tipmenu) {
            Main.uiGroup.add_child(this.tipmenu.actor);
            this.hide_tip();
        }
    }

    show_tip() {
        print_debug('TipBox show_tip()');

        if (!this.tipmenu) {
            return;
        }
        this.tipmenu.open();
        if (this.in_to) {
            GLib.Source.remove(this.in_to);
            this.in_to = 0;
        }
    }

    hide_tip() {
        print_debug('TipBox hide_tip()');

        if (!this.tipmenu) {
            return;
        }
        this.tipmenu.close();
        if (this.out_to) {
            GLib.Source.remove(this.out_to);
            this.out_to = 0;
        }
        if (this.in_to) {
            GLib.Source.remove(this.in_to);
            this.in_to = 0;
        }
    }

    on_enter() {
        print_debug('TipBox on_enter()');

        let show_tooltip = this.show_tooltip;

        if (!show_tooltip) {
            return;
        }

        if (this.out_to) {
            GLib.Source.remove(this.out_to);
            this.out_to = 0;
        }
        if (!this.in_to) {
            this.in_to = GLib.timeout_add(GLib.PRIORITY_DEFAULT, 500, () => {
                this.show_tip();
                this.in_to = 0;
                return GLib.SOURCE_REMOVE;
            });
        }
    }

    on_leave() {
        print_debug('TipBox on_leave()');

        if (this.in_to) {
            GLib.Source.remove(this.in_to);
            this.in_to = 0;
        }
        if (!this.out_to) {
            this.out_to = GLib.timeout_add(GLib.PRIORITY_DEFAULT, 500, () => {
                this.hide_tip();
                this.out_to = 0;
                return GLib.SOURCE_REMOVE;
            });
        }
    }

    destroy() {
        print_debug('TipBox destroy()');

        if (this.in_to) {
            GLib.Source.remove(this.in_to);
            this.in_to = 0;
        }

        if (this.out_to) {
            GLib.Source.remove(this.out_to);
            this.out_to = 0;
        }

        this.actor.destroy();
    }
};

const ElementBase = class PingMonitor_ElementBase extends TipBox {
    constructor(properties, settings, extensionPath) {
        super();
        print_debug('ElementBase constructor()');

        this._settings = settings;
        this._extensionPath = extensionPath;
        this.elt = '';
        this.tag = '';
        this.name = '';
        this.show_name = false;
        this.color_name = [];
        this.text_items = [];
        this.menu_items = [];
        this.menu_visible = true;
        this.color = '#ff0000';
        this.refresh_interval = 5000;
        this.visible = true;
        this.timeout = undefined;

        this._pingStdout = null;
        this._pingDataStdout = null;
        this._pingStderr = null;
        this._pingDataStderr = null;

        this._prepareToDestroy = false;

        Object.assign(this, properties);

        this.vals = [];
        this.tip_labels = [];
        this.tip_vals = [];
        this.tip_unit_labels = [];

        this.chart = new StatusSquare(Math.round(20 * 4 / 5), this);
        this._settings.connect('changed::background', () => {
            this.chart._updateStyle();
        });

        this.actor.visible = this.visible;

        this.interval = this.refresh_interval;
        this.add_timeout();

        this.label = new St.Label({
            text: this.name,
            style_class: 'ping-status-label',
            y_align: Clutter.ActorAlign.CENTER,
            x_expand: false,
            y_expand: false,
            natural_height_set: false
        });
        this.label.visible = this.show_name;

        this.menu_visible = true;

        this.actor.add_child(this.label);
        this.text_box = new St.BoxLayout();

        this.text_items = this.create_text_items();
        this.actor.add_child(this.chart.actor);
        this.text_box.visible = true;
        this.chart.actor.visible = this.visible;
        this.menu_items = this.create_menu_items();
    }

    add_timeout() {
        this.remove_timeout();
        print_debug('Add timeout: ' + this.tag);
        if (!this._prepareToDestroy) {
            this.timeout = GLib.timeout_add(GLib.PRIORITY_DEFAULT, this.interval, () => {
                return this.update();
            });
        }
    }

    remove_timeout() {
        print_debug('Remove (try) timeout: ' + this.tag);
        if (this.timeout !== undefined) {
            print_debug('Remove timeout: ' + this.tag);
            GLib.Source.remove(this.timeout);
            this.timeout = undefined;
        }
    }

    tip_format() {
        print_debug('ElementBase tip_format()');

        for (let i = 0; i < this.color_name.length; i++) {
            let tipline = new PingTipItem();
            this.tipmenu.addMenuItem(tipline);
            this.tip_labels[i] = new St.Label({text: ''});
            tipline.add_child(this.tip_labels[i]);
            this.tip_vals[i] = 0;
        }
    }

    update() {
        print_debug('ElementBase update()');

        this.remove_timeout();

        if (!this.menu_visible && !this.actor.visible) {
            return false;
        }
        this.refresh();

        return GLib.SOURCE_CONTINUE;
    }

    updateDrawing() {
        this._apply();
        this.chart.update(this.color, true);
        for (let i = 0; i < this.tip_vals.length; i++) {
            if (this.tip_labels[i]) {
                this.tip_labels[i].text = this.tip_vals[i].toString();
            }
        }
    }

    destroy() {
        print_debug('ElementBase destroy()');

        this.remove_timeout();
        TipBox.prototype.destroy.call(this);
    }

    stop() {
        this._prepareToDestroy = true;
        this.remove_timeout();
    }

    isRunning() {
        return (
            this._pingStdout != null ||
            this._pingDataStdout != null ||
            this._pingStderr != null ||
            this._pingDataStderr != null
        );
    }
};

const Ping = class PingMonitor_Ping extends ElementBase {
    constructor(id, tag, name, address, ping_count, ping_interval,
                ping_deadline, refresh_interval, active, visible,
                show_name, show_address, show_tooltip, warning_threshold,
                settings, extensionPath) {
        if (show_address) {
            name = name + '\n' + address;
        }
        super({
            elt: 'ping',
            tag: tag,
            name: name,
            show_name: show_name,
            visible: visible,
            refresh_interval: refresh_interval,
            color_name: ['used'],
        }, settings, extensionPath);

        print_debug('Ping constructor()');

        this.ping_message = '';
        this.id = id;
        this.address = address;
        this.ping_count = ping_count;
        this.ping_interval = ping_interval;
        this.ping_deadline = ping_deadline;
        this.active = active;
        this.show_address = show_address;
        this.show_tooltip = show_tooltip;
        this.warning_threshold = warning_threshold;
        this.tip_format();
        this.update();
    }

    _pingReadStdout() {
        this._pingDataStdout.fill_async(-1, GLib.PRIORITY_DEFAULT, null, (stream, result) => {
            if (stream.fill_finish(result) == 0) {
                try {
                    let buffer = stream.peek_buffer();
                    if (buffer instanceof Uint8Array) {
                        this._pingOutput = new TextDecoder().decode(buffer);
                    } else {
                        this._pingOutput = buffer.toString();
                    }
                    if (this._pingOutput) {
                        print_debug('Ping info: ' + this._pingOutput);

                        let firstLine = this._pingOutput.match(/[\w .:()]+\n/m);
                        print_debug('First line: ' + firstLine[0]);

                        let lastLines = this._pingOutput.match(/---[\w\W]+/m);
                        lastLines[0] = lastLines[0].replace(/^\s+|\s+$/g, '');
                        print_debug('Last lines: ' + lastLines[0]);

                        this.ping_message = firstLine[0] + lastLines[0];
                        print_debug('Ping info: ' + this.ping_message);

                        let loss = this._pingOutput.match(/received, (\d*)/m);
                        let times = this._pingOutput.match(/mdev = (\d*.\d*)\/(\d*.\d*)\/(\d*.\d*)\/(\d*.\d*)/m);

                        if (times != null && times.length == 5 &&
                            loss != null && loss.length == 2) {
                            print_debug('loss: ' + loss[1]);
                            print_debug('min: ' + times[1]);
                            print_debug('avg: ' + times[2]);
                            print_debug('max: ' + times[3]);
                            print_debug('mdev: ' + times[4]);

                            if (loss[1] != 0 && loss[1] != 100) {
                                if (!this._prepareToDestroy) {
                                    this.color = this._settings.get_string('ping-loss-color');
                                }
                            } else if (loss[1] == 100) {
                                if (!this._prepareToDestroy) {
                                    this.color = this._settings.get_string('ping-bad-color');
                                }
                            } else if (times[3] > this.warning_threshold) {
                                if (!this._prepareToDestroy) {
                                    this.color = this._settings.get_string('ping-warning-color');
                                }
                            } else {
                                if (!this._prepareToDestroy) {
                                    this.color = this._settings.get_string('ping-good-color');
                                }
                            }
                        } else {
                            if (!this._prepareToDestroy) {
                                this.color = this._settings.get_string('ping-bad-color');
                            }
                        }
                        if (!this._prepareToDestroy) {
                            this.updateDrawing();
                        }
                    }
                } catch (e) {
                    print_info(e.toString());
                    if (!this._prepareToDestroy) {
                        this.color = this._settings.get_string('ping-bad-color');
                        this.updateDrawing();
                    }
                }
                this._pingStdout.close(null);
                this._pingStdout = null;
                this._pingDataStdout.close(null);
                this._pingDataStdout = null;

                this.add_timeout();
                return;
            }

            stream.set_buffer_size(2 * stream.get_buffer_size());
            this._pingReadStdout();
        });
    }

    _pingReadStderr() {
        this._pingDataStderr.fill_async(-1, GLib.PRIORITY_DEFAULT, null, (stream, result) => {
            if (stream.fill_finish(result) == 0) {
                try {
                    let buffer = stream.peek_buffer();
                    if (buffer instanceof Uint8Array) {
                        this._pingOutputErr = new TextDecoder().decode(buffer);
                    } else {
                        this._pingOutputErr = buffer.toString();
                    }
                    if (this._pingOutputErr) {
                        this.ping_message = this._pingOutputErr;
                        print_debug('Ping error: ' + this.ping_message);

                        if (!this._prepareToDestroy) {
                            this.color = this._settings.get_string('ping-bad-color');
                            this.updateDrawing();
                        }
                    }
                } catch (e) {
                    print_info(e.toString());
                    if (!this._prepareToDestroy) {
                        this.color = this._settings.get_string('ping-bad-color');
                        this.updateDrawing();
                    }
                }
                this._pingStderr.close(null);
                this._pingStderr = null;
                this._pingDataStderr.close(null);
                this._pingDataStderr = null;

                return;
            }

            stream.set_buffer_size(2 * stream.get_buffer_size());
            this._pingReadStderr();
        });
    }

    refresh() {
        print_debug('Ping refresh()');

        try {
            let script = [
                '/bin/bash',
                this._extensionPath + '/ping.sh',
                this.address,
                '' + this.ping_count,
                '' + this.ping_deadline,
                '' + this.ping_interval
            ];

            let success;
            [success, this.child_pid, this.in_fd, this.out_fd, this.err_fd] = GLib.spawn_async_with_pipes(
                null,
                script,
                null,
                GLib.SpawnFlags.DO_NOT_REAP_CHILD,
                null
            );

            this._pingStdout = new Gio.UnixInputStream({fd: this.out_fd, close_fd: true});
            this._pingDataStdout = new Gio.DataInputStream({base_stream: this._pingStdout});
            this._pingStderr = new Gio.UnixInputStream({fd: this.err_fd, close_fd: true});
            this._pingDataStderr = new Gio.DataInputStream({base_stream: this._pingStderr});
            new Gio.UnixOutputStream({fd: this.in_fd, close_fd: true}).close(null);

            this._tagWatchChild = GLib.child_watch_add(GLib.PRIORITY_DEFAULT, this.child_pid,
                (pid, status, data) => {
                    GLib.Source.remove(this._tagWatchChild);
                    GLib.spawn_close_pid(pid);
                    this.child_pid = undefined;
                }
            );

            this._pingReadStdout();
            this._pingReadStderr();
        } catch (e) {
            print_info(e.toString());
        }
    }

    _apply() {
        print_debug('Ping _apply()');

        this.menu_items[0].text = this.ping_message;
        this.tip_vals[0] = this.ping_message;
    }

    create_text_items() {
        print_debug('Ping create_text_items()');

        return [
            new St.Label({
                text: '',
                style_class: 'ping-status-value',
                y_align: Clutter.ActorAlign.CENTER
            }),
            new St.Label({
                text: '%',
                style_class: 'ping-perc-label',
                y_align: Clutter.ActorAlign.CENTER
            })
        ];
    }

    create_menu_items() {
        print_debug('Ping create_menu_items()');

        return [
            new St.Label({
                text: '',
                style_class: 'ping-value-left'
            })
        ];
    }
};

const Icon = class PingMonitor_Icon {
    constructor(settings) {
        print_debug('Icon constructor()');
        this._settings = settings;
        this.actor = new St.Icon({
            icon_name: 'system-run-symbolic',
            style_class: 'system-status-icon'
        });
        this.actor.visible = this._settings.get_boolean('icon-display');
        this._settings.connect('changed::icon-display', () => {
            print_debug('changed icon-display');
            this.actor.visible = this._settings.get_boolean('icon-display');
        });
    }
};

export default class PingMonitorExtension extends Extension {
    enable() {
        print_info('applet enabling');

        this._settings = this.getSettings();
        this._style = new PingStyleManager();
        this._pingBox = null;
        this._elts = [];
        this._tray = null;

        if (!pingDepsGtop) {
            this._pingDialog = new PingDialog();
            this._dialogTimeout = GLib.timeout_add_seconds(GLib.PRIORITY_DEFAULT, 1, () => {
                this._pingDialog.open();
                this._dialogTimeout = null;
                return GLib.SOURCE_REMOVE;
            });
        } else {
            this._tray = new PanelMenu.Button(0.5, 'PingMonitor', false);
            this._icon = new Icon(this._settings);
            this._elts = [];

            let isFileOk = false;
            let path = this._settings.get_string('ping-config-path');
            if (path == '') {
                path = GLib.getenv('HOME') + '/.config/ping-monitor.conf';
                this._settings.set_string('ping-config-path', path);
            }
            isFileOk = this._read_from_file(path);
            this._settings.set_boolean('icon-display', !isFileOk);

            let spacing = '4';
            this._pingBox = new St.BoxLayout({style: 'spacing: ' + spacing + 'px;'});
            this._tray.add_child(this._pingBox);
            this._pingBox.add_child(this._icon.actor);

            for (let elt of this._elts) {
                this._pingBox.add_child(elt.actor);
            }

            let menu_info = new PopupMenu.PopupBaseMenuItem({reactive: false});
            let menu_info_box = new St.BoxLayout();
            menu_info.add_child(menu_info_box);
            this._tray.menu.addMenuItem(menu_info, 0);

            this._build_menu_info();

            this._tray.menu.addMenuItem(new PopupMenu.PopupSeparatorMenuItem());

            this._tray.menu.connect('open-state-changed', (menu, isOpen) => {
                if (isOpen) {
                    this._ping_menu_timeout = GLib.timeout_add_seconds(GLib.PRIORITY_DEFAULT, 5, () => {
                        return GLib.SOURCE_CONTINUE;
                    });
                } else {
                    if (this._ping_menu_timeout) {
                        GLib.Source.remove(this._ping_menu_timeout);
                        this._ping_menu_timeout = null;
                    }
                }
            });

            let item = new PopupMenu.PopupMenuItem(_('Reload config'));
            item.connect('activate', () => {
                this._reload_async();
            });
            this._tray.menu.addMenuItem(item);

            item = new PopupMenu.PopupMenuItem(_('Preferences...'));
            item.connect('activate', () => {
                this.openPreferences();
            });
            this._tray.menu.addMenuItem(item);

            Main.panel.addToStatusArea('ping-monitor', this._tray);
        }

        print_info('applet enabling done');
    }

    disable() {
        print_info('disable applet');

        if (this._dialogTimeout) {
            GLib.Source.remove(this._dialogTimeout);
            this._dialogTimeout = null;
        }

        if (this._pingDialog) {
            this._pingDialog.destroy();
            this._pingDialog = null;
        }

        if (this._ping_menu_timeout) {
            GLib.Source.remove(this._ping_menu_timeout);
            this._ping_menu_timeout = null;
        }

        for (let elt of this._elts) {
            elt.stop();
        }

        if (this._pingBox) {
            for (let elt of this._elts) {
                this._pingBox.remove_child(elt.actor);
            }
        }

        for (let elt of this._elts) {
            elt.destroy();
        }

        if (this._tray) {
            this._tray.destroy();
            this._tray = null;
        }

        this._elts = [];
        this._pingBox = null;
        this._icon = null;
        this._settings = null;
        this._style = null;

        print_info('applet disabled');
    }

    _read_from_file(path) {
        print_info('read_from_file()');

        try {
            let [ok, contents] = GLib.file_get_contents(path);
            if (ok) {
                if (contents instanceof Uint8Array) {
                    contents = new TextDecoder().decode(contents);
                }
                let map = JSON.parse(contents);

                try {
                    debugOutput = map['debug_output'];
                } catch (e) {
                    debugOutput = false;
                }

                try {
                    for (let i = 0; i < map['ping_config'].length; i++) {
                        let tag = map['ping_config'][i]['tag'];
                        let name = map['ping_config'][i]['name'];
                        let address = map['ping_config'][i]['address'];
                        let ping_count = map['ping_config'][i]['ping_count'];
                        let ping_interval = map['ping_config'][i]['ping_interval'];
                        let ping_deadline = map['ping_config'][i]['ping_deadline'];
                        let refresh_interval = map['ping_config'][i]['refresh_interval'];
                        let active = map['ping_config'][i]['active'];
                        let visible = map['ping_config'][i]['visible'];
                        let show_name = map['ping_config'][i]['show_name'];
                        let show_address = map['ping_config'][i]['show_address'];
                        let show_tooltip = map['ping_config'][i]['show_tooltip'];
                        let warning_threshold = map['ping_config'][i]['warning_threshold'];

                        print_debug('tag:               ' + tag);
                        print_debug('name:              ' + name);
                        print_debug('address:           ' + address);

                        this._elts.push(new Ping(
                            i,
                            tag,
                            name,
                            address,
                            ping_count,
                            ping_interval,
                            ping_deadline,
                            refresh_interval,
                            active,
                            visible,
                            show_name,
                            show_address,
                            show_tooltip,
                            warning_threshold,
                            this._settings,
                            this.path));
                    }
                } catch (e) {
                    print_info('could not load config');
                    print_info('error: ' + e);
                    return false;
                }
            }
        } catch (e) {
            print_info('Error: ' + e);
            return false;
        }

        return true;
    }

    _build_menu_info() {
        print_debug('build_menu_info()');

        if (this._tray.menu._getMenuItems().length &&
            this._tray.menu._getMenuItems()[0].get_last_child) {
            let lastChild = this._tray.menu._getMenuItems()[0].get_last_child();
            if (lastChild) {
                lastChild.destroy_all_children();
                for (let elt of this._elts) {
                    elt.menu_items = elt.create_menu_items();
                }
            } else {
                return;
            }
        } else {
            return;
        }

        let menu_info_box_table = new St.Widget({
            style: 'padding: 10px 0px 10px 0px; spacing-rows: 10px; spacing-columns: 15px;',
            layout_manager: new Clutter.GridLayout({orientation: Clutter.Orientation.VERTICAL})
        });
        let menu_info_box_table_layout = menu_info_box_table.layout_manager;

        let row_index = 0;
        for (let elt of this._elts) {
            if (!elt.menu_visible) {
                continue;
            }

            menu_info_box_table_layout.attach(
                new St.Label({
                    text: elt.name,
                    style_class: 'ping-title',
                    x_align: Clutter.ActorAlign.START,
                    y_align: Clutter.ActorAlign.CENTER
                }), 0, row_index, 1, 1);

            let col_index = 1;
            for (let item of elt.menu_items) {
                menu_info_box_table_layout.attach(item, col_index, row_index, 1, 1);
                col_index++;
            }

            row_index++;
        }

        let lastChild = this._tray.menu._getMenuItems()[0].get_last_child();
        if (lastChild) {
            lastChild.add_child(menu_info_box_table);
        }
    }

    async _reload_async() {
        print_info('Reload ping applet async...');

        for (let elt of this._elts) {
            elt.stop();
        }

        for (let elt of this._elts) {
            while (elt.isRunning()) {
                print_info('still running');
                await new Promise(resolve => GLib.timeout_add(GLib.PRIORITY_DEFAULT, 10, () => {
                    resolve();
                    return GLib.SOURCE_REMOVE;
                }));
            }
        }

        for (let elt of this._elts) {
            this._pingBox.remove_child(elt.actor);
        }

        for (let elt of this._elts) {
            elt.destroy();
        }
        this._elts = [];

        let isFileOk = false;
        let path = this._settings.get_string('ping-config-path');
        if (path == '') {
            path = GLib.getenv('HOME') + '/.config/ping-monitor.conf';
            this._settings.set_string('ping-config-path', path);
        }
        isFileOk = this._read_from_file(path);
        this._settings.set_boolean('icon-display', !isFileOk);

        for (let elt of this._elts) {
            this._pingBox.add_child(elt.actor);
        }

        this._build_menu_info();

        print_info('Reloaded.');
    }
}