App.xaml.cs

using System;
using System.IO;
using System.Windows;

namespace DoorLockTray
{
    public partial class App : System.Windows.Application
    {
        private System.Windows.Forms.NotifyIcon? trayIcon;
        private HaWsClient? client;

        protected override async void OnStartup(StartupEventArgs e)
        {
            base.OnStartup(e);

            trayIcon = new System.Windows.Forms.NotifyIcon
            {
                Text = "Door Lock",
                Icon = IconLoader.Load("locked.ico"),
                Visible = true
            };

            var menu = new System.Windows.Forms.ContextMenuStrip();
            var exitItem = new System.Windows.Forms.ToolStripMenuItem("Exit");
            exitItem.Click += (_, __) => Shutdown();
            menu.Items.Add(exitItem);

            trayIcon.ContextMenuStrip = menu;

            // TODO: Set these
            var haUrl = "wss://x/api/websocket"; 
            var token = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
            var lockEntityId = "lock.office_door";

            client = new HaWsClient(haUrl, token, lockEntityId);

            client.LockStateChanged += state =>
            {
                Dispatcher.Invoke(() =>
                {
                    if (trayIcon is null) return;

                    if (string.Equals(state, "locked", StringComparison.OrdinalIgnoreCase))
                    {
                        trayIcon.Icon = IconLoader.Load("locked.ico");
                        trayIcon.Text = "Door: Locked";
                    }
                    else if (string.Equals(state, "unlocked", StringComparison.OrdinalIgnoreCase))
                    {
                        trayIcon.Icon = IconLoader.Load("unlocked.ico");
                        trayIcon.Text = "Door: Unlocked";
                    }
                    else
                    {
                        trayIcon.Text = $"Door: {state}";
                    }
                });
            };

            await client.StartAsync();
        }

        protected override void OnExit(ExitEventArgs e)
        {
            client?.Dispose();

            if (trayIcon is not null)
            {
                trayIcon.Visible = false;
                trayIcon.Dispose();
                trayIcon = null;
            }

            base.OnExit(e);
        }
    }

    internal static class IconLoader
    {
        public static System.Drawing.Icon Load(string fileName)
        {
            var path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Assets", fileName);
            return new System.Drawing.Icon(path);
        }
    }
}