0.9.0

SettingsStore.cs

@@ -0,0 +1,62 @@
+using Microsoft.Win32;
+
+namespace HearingProtector;
+
+internal sealed record AppSettings(double MinPercent, double FullDecayMinutes)
+{
+    public static AppSettings Default => new(1.0, 30.0);
+}
+
+internal static class SettingsStore
+{
+    private const string KeyPath = @"Software\HearingProtector";
+    private const string ValueMin = "MinPercent";
+    private const string ValueDecay = "FullDecayMinutes";
+
+    public static AppSettings Load()
+    {
+        try
+        {
+            using var key = Registry.CurrentUser.OpenSubKey(KeyPath);
+            if (key is null) return AppSettings.Default;
+
+            double min = ReadDouble(key, ValueMin, AppSettings.Default.MinPercent);
+            double decay = ReadDouble(key, ValueDecay, AppSettings.Default.FullDecayMinutes);
+
+            if (min < 0 || min > 50) min = AppSettings.Default.MinPercent;
+            if (decay < 30 || decay > 360) decay = AppSettings.Default.FullDecayMinutes;
+
+            return new AppSettings(min, decay);
+        }
+        catch
+        {
+            return AppSettings.Default;
+        }
+    }
+
+    public static void Save(AppSettings s)
+    {
+        try
+        {
+            using var key = Registry.CurrentUser.CreateSubKey(KeyPath, writable: true);
+            if (key is null) return;
+
+            key.SetValue(ValueMin, s.MinPercent, RegistryValueKind.String);
+            key.SetValue(ValueDecay, s.FullDecayMinutes, RegistryValueKind.String);
+            key.DeleteValue("PollMs", throwOnMissingValue: false);
+        }
+        catch { }
+    }
+
+    private static double ReadDouble(RegistryKey key, string name, double fallback)
+    {
+        var raw = key.GetValue(name);
+        return raw switch
+        {
+            string s when double.TryParse(s, System.Globalization.CultureInfo.InvariantCulture,
+                                          out var d) => d,
+            double d => d,
+            _ => fallback,
+        };
+    }
+}