initial

OverlayManager.cs

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+using Microsoft.Win32;
+using System;
+using System.Threading;
+using System.Windows;
+
+namespace Bedtimer
+{
+    public sealed class OverlayManager : IDisposable
+    {
+        private Config _cfg = null!;
+        private OverlayWindow? _overlay;
+        private Thread? _cfgThread;
+        private string _cycleId = "";
+
+        public void Start()
+        {
+            _cfg = Config.LoadOrCreate();
+            BuildOverlay();
+            StartConfigListener();
+
+            // React to system time changes / DST
+            SystemEvents.TimeChanged += (_, __) => Application.Current.Dispatcher.Invoke(RecomputeSchedule);
+        }
+
+        private void BuildOverlay()
+        {
+            Application.Current.Dispatcher.Invoke(() =>
+            {
+                _overlay ??= new OverlayWindow();
+                _overlay.Show();             // safe: collapsed until T-60
+                RecomputeSchedule();
+            });
+        }
+
+        private void StartConfigListener()
+        {
+            _cfgThread = new Thread(() =>
+            {
+                using var ev = Signals.SubscribeConfigChanged();
+                while (true)
+                {
+                    ev.WaitOne();
+                    Application.Current.Dispatcher.Invoke(RecomputeSchedule);
+                }
+            });
+            _cfgThread.IsBackground = true;
+            _cfgThread.Start();
+        }
+
+        private void RecomputeSchedule()
+        {
+            _cfg = Config.LoadOrCreate();
+
+            var now = DateTime.Now;
+            var bedToday = now.Date.AddMinutes(_cfg.BedMinutes);
+            var bedT = (now <= bedToday) ? bedToday : bedToday.AddDays(1);
+
+            var warnT = bedT.AddMinutes(-_cfg.WarnLead);
+            var flashT = bedT.AddMinutes(-_cfg.FlashLead);
+            var lockT = bedT.AddMinutes(+_cfg.LockDelay);
+
+            // one lock per calendar day (next bedtime’s date)
+            _cycleId = bedT.ToString("yyyy-MM-dd");
+
+            _overlay!.SetSchedule(_cycleId, warnT, flashT, bedT, lockT);
+        }
+
+        public void Dispose()
+        {
+            // overlay lives/dies with app; nothing extra
+        }
+    }
+}