// This example is based on the original GJS example: https://gitlab.gnome.org/GNOME/gjs/-/blob/master/examples/dbus-client.js
// SPDX-License-Identifier: MIT OR LGPL-2.0-or-later
// SPDX-FileCopyrightText: 2020 Andy Holmes <andrew.g.r.holmes@gmail.com>

import GLib from 'gi://GLib?version=2.0';
import Gio from 'gi://Gio?version=2.0';
import { DbusIfaceXml, dbusIfaceXml } from './dbus-ifrace-xml.js'

// Pass the XML string to make a re-usable proxy class for an interface proxies.
const TestProxy = Gio.DBusProxy.makeProxyWrapper<DbusIfaceXml>(dbusIfaceXml);

let proxy: (DbusIfaceXml & Gio.DBusProxy) | null = null;
let proxySignalId = 0;
let proxyPropId = 0;

// Watching a name on DBus. Another option is to create a proxy with the
// `Gio.DBusProxyFlags.DO_NOT_AUTO_START` flag and watch the `g-name-owner`
// property.
function onNameAppeared(connection: Gio.DBusConnection, name: string, _owner: any) {
    print(`"${name}" appeared on the session bus`);

    // If creating a proxy synchronously, errors will be thrown as normal
    try {
        proxy = TestProxy(
            Gio.DBus.session,
            'org.gnome.gjs.Test',
            '/org/gnome/gjs/Test'
        );
    } catch (e: any) {
        logError(e);
        return;
    }


    // Proxy wrapper signals use the special functions `connectSignal()` and
    // `disconnectSignal()` to avoid conflicting with regular GObject signals.
    proxySignalId = proxy.connectSignal('TtestSignal', (proxy_, name_, args) => {
        print(`TestSignal: ${args[0]}, ${args[1]}`);
    });


    // To watch property changes, you can connect to the `g-properties-changed`
    // GObject signal with `connect()`
    proxyPropId = proxy.connect('g-properties-changed', (proxy_: Gio.DBusProxy, changed: GLib.Variant, invalidated) => {
        for (let [prop, value] of Object.entries(changed.deepUnpack<{[key: string]: GLib.Variant}>()))
            print(`Property '${prop}' changed to '${value.deepUnpack()}'`);

        for (let prop of invalidated)
            print(`Property '${prop}' invalidated`);
    });


    // Reading and writing properties is straight-forward
    print(`ReadOnlyProperty: ${proxy.ReadOnlyProperty}`);

    print(`ReadWriteProperty: ${proxy.ReadWriteProperty}`);

    proxy.ReadWriteProperty = !proxy.ReadWriteProperty;
    print(`ReadWriteProperty: ${proxy.ReadWriteProperty}`);


    // Both synchronous and asynchronous functions will be generated
    try {
        let value = proxy.SimpleMethodSync();

        print(`SimpleMethod: ${value}`);
    } catch (e: any) {
        logError(`SimpleMethod: ${e.message}`);
    }

    proxy.ComplexMethodRemote('input string', (value, error, fdList) => {
        // If @error is not `null`, then an error occurred
        if (error !== null) {
            logError(error);
            return;
        }

        print(`ComplexMethod value: ${value}`);

        // Methods that return file descriptors are fairly rare, so you should
        // know to expect one or not.
        if (fdList !== null) {
            //
        }
    });

    proxy.SimpleMethodRemote((value, error, fdList) => {
        // If @error is not `null`, then an error occurred
        if (error !== null) {
            logError(error);
            return;
        }

        print(`SimpleMethod value: "${value}"`);

        // Methods that return file descriptors are fairly rare, so you should
        // know to expect one or not.
        if (fdList !== null) {
            //
        }
    });

}

function onNameVanished(connection: Gio.DBusConnection, name: string) {
    print(`"${name}" vanished from the session bus`);

    if (proxy !== null) {
        proxy.disconnectSignal(proxySignalId);
        proxy.disconnect(proxyPropId);
        proxy = null;
    }
}

print("Start DBus client");
let busWatchId = Gio.bus_watch_name(
    Gio.BusType.SESSION,
    'org.gnome.gjs.Test',
    Gio.BusNameWatcherFlags.NONE,
    onNameAppeared,
    onNameVanished
);

// Start an event loop
let loop = GLib.MainLoop.new(null, false);
loop.run();

// Unwatching names works just like disconnecting signal handlers.
Gio.bus_unown_name(busWatchId);