Add support for multiple languages

PowerControlHubApp/App.xaml.cs

@@ -1,6 +1,7 @@
 using Microsoft.Extensions.Logging;
 using PowerControlHubApp.Services;
 using static PowerControlHubApp.Internal.Constants;
+using static PowerControlHubApp.Resources.Localization.AppResources;
 
 #if WINDOWS
 using WinRT.Interop;
@@ -39,11 +40,12 @@ public App(
 
             // Apply after InitializeComponent so Application.Resources is populated.
             ThemeService.ApplySaved();
+            LanguageService.ApplySaved();
         }
 
         protected override Window CreateWindow(IActivationState activationState)
         {
-            var window = new Window(new AppShell());
+            Window window = new Window(new AppShell());
 
 #if WINDOWS
             window.HandlerChanged += OnWindowHandlerChanged;

PowerControlHubApp/AppShell.xaml

@@ -4,42 +4,43 @@
     xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
     xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
     xmlns:views="clr-namespace:PowerControlHubApp.Views"
+    xmlns:localization="clr-namespace:PowerControlHubApp.Resources.Localization"
     Title="PowerControlHub"
     Shell.NavBarIsVisible="False">
 
     <ShellContent
         x:Name="DashboardPage"
-        Title="Dashboard"
+        Title="{x:Static localization:AppResources.Dashboard}"
         Route="DashboardPage"
         ContentTemplate="{DataTemplate views:DashboardPage}" />
 
     <ShellContent
         x:Name="RelayConfigPage"
-        Title="Relays"
+        Title="{x:Static localization:AppResources.Relays}"
         Route="RelayConfigPage"
         ContentTemplate="{DataTemplate views:RelayConfigPage}" />
 
     <ShellContent
         x:Name="SensorConfigPage"
-        Title="Local Sensors"
+        Title="{x:Static localization:AppResources.LocalSensorsTitle}"
         Route="SensorConfigPage"
         ContentTemplate="{DataTemplate views:LocalSensorConfigPage}" />
 
     <ShellContent
         x:Name="ExternalSensorConfigPage"
-        Title="External Sensors"
+        Title="{x:Static localization:AppResources.ExternalSensors}"
         Route="ExternalSensorConfigPage"
         ContentTemplate="{DataTemplate views:ExternalSensorConfigPage}" />
 
     <ShellContent
         x:Name="SettingsPage"
-        Title="Settings"
+        Title="{x:Static localization:AppResources.Settings}"
         Route="SettingsPage"
         ContentTemplate="{DataTemplate views:SettingsPage}" />
 
     <ShellContent
         x:Name="SystemPage"
-        Title="System"
+        Title="{x:Static localization:AppResources.SystemTitle}"
         Route="SystemPage"
         ContentTemplate="{DataTemplate views:SystemPage}" />
 

PowerControlHubApp/Converters/SingleOrArrayConverter.cs

@@ -11,7 +11,7 @@ public override T[] Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSeri
             if (reader.TokenType == JsonTokenType.StartArray)
                 return JsonSerializer.Deserialize<T[]>(ref reader, options)!;
 
-            var single = JsonSerializer.Deserialize<T>(ref reader, options);
+            T single = JsonSerializer.Deserialize<T>(ref reader, options);
             return [single!];
         }
 

PowerControlHubApp/GlobalSuppressions.cs

@@ -0,0 +1,9 @@
+// This file is used by Code Analysis to maintain SuppressMessage
+// attributes that are applied to this project.
+// Project-level suppressions either have no target or are given
+// a specific target and scoped to a namespace, type, member, etc.
+
+using System.Diagnostics.CodeAnalysis;
+
+[assembly: SuppressMessage("Performance", "CA1822:Mark members as static", Justification = "Used as binding in xaml", Scope = "member", Target = "~P:PowerControlHubApp.ViewModels.SystemViewModel.LanguageOptions")]
+[assembly: SuppressMessage("Style", "CC0009:Avoid magic numbers (and un-named literals)", Justification = "<Pending>", Scope = "member", Target = "~M:PowerControlHubApp.Services.LanguageService.BuildAvailableCultures~System.Collections.Generic.List{System.Globalization.CultureInfo}")]

PowerControlHubApp/MauiProgram.cs

@@ -11,7 +11,7 @@ public static class MauiProgram
 
         public static MauiApp CreateMauiApp()
         {
-            var builder = MauiApp.CreateBuilder();
+            MauiAppBuilder builder = MauiApp.CreateBuilder();
             builder
                 .UseMauiApp<App>()
                 .ConfigureFonts(fonts =>
@@ -26,7 +26,7 @@ public static MauiApp CreateMauiApp()
             // Connections — each owns its own HttpClient (one persistent TCP socket)
             builder.Services.AddSingleton<DashboardConnection>(sp =>
             {
-                var connection = new DashboardConnection();
+                DashboardConnection connection = new DashboardConnection();
                 string ip = Preferences.Get(KeyDeviceIpAddress, string.Empty);
                 string port = Preferences.Get(KeyDeviceIpPort, DefaultDeviceIpPort);
 
@@ -48,7 +48,7 @@ public static MauiApp CreateMauiApp()
             // Register ConfigConnection as the inner singleton
             builder.Services.AddSingleton<ConfigConnection>(sp =>
             {
-                var connection = new ConfigConnection(
+                ConfigConnection connection = new ConfigConnection(
                     sp.GetRequiredService<IMessageBus>(),
                     sp.GetRequiredService<ILogger<ConfigConnection>>());
 
@@ -78,7 +78,7 @@ public static MauiApp CreateMauiApp()
             // Legacy service — kept as thin facade that delegates to the two connections
             builder.Services.AddSingleton<PowerHubService>(sp =>
             {
-                var service = new PowerHubService(
+                PowerHubService service = new PowerHubService(
                     sp.GetRequiredService<IDashboardConnection>(),
                     sp.GetRequiredService<IConfigConnection>(),
                     sp.GetRequiredService<IMessageBus>());
@@ -92,6 +92,7 @@ public static MauiApp CreateMauiApp()
             builder.Services.AddSingleton<SensorMetaCache>();
             builder.Services.AddSingleton<LogService>();
             builder.Services.AddSingleton<ThemeService>();
+            builder.Services.AddSingleton<LanguageService>();
             builder.Services.AddSingleton<RelayStore>();
             builder.Services.AddSingleton<TimeSyncService>();
 
@@ -114,15 +115,14 @@ public static MauiApp CreateMauiApp()
             builder.Services.AddTransient<NextionSettingsViewModel>();
             builder.Services.AddTransient<XpdzToneSettingsViewModel>();
 
-            // Pages
-            builder.Services.AddSingleton<DashboardPage>();
-            builder.Services.AddSingleton<SettingsPage>();
-            builder.Services.AddSingleton<RelayConfigPage>();
-            builder.Services.AddSingleton<SystemPage>();
+            builder.Services.AddTransient<DashboardPage>();
+            builder.Services.AddTransient<SettingsPage>();
+            builder.Services.AddTransient<RelayConfigPage>();
+            builder.Services.AddTransient<SystemPage>();
             builder.Services.AddTransient<RelayDetailPage>();
-            builder.Services.AddSingleton<ExternalSensorConfigPage>();
+            builder.Services.AddTransient<ExternalSensorConfigPage>();
             builder.Services.AddTransient<ExternalSensorDetailPage>();
-            builder.Services.AddSingleton<LocalSensorConfigPage>();
+            builder.Services.AddTransient<LocalSensorConfigPage>();
             builder.Services.AddTransient<LocalSensorDetailPage>();
             builder.Services.AddTransient<TimeSettingsPage>();
             builder.Services.AddTransient<LocationSettingsPage>();

PowerControlHubApp/Models/ExternalSensorConfigModel.cs

@@ -1,5 +1,6 @@
 using System.Text.Json.Serialization;
 using static PowerControlHubApp.Internal.Constants;
+using static PowerControlHubApp.Resources.Localization.AppResources;
 
 namespace PowerControlHubApp.Models
 {

PowerControlHubApp/Models/Json/OtaStatusModel.cs

@@ -1,5 +1,6 @@
 using System.Text.Json.Serialization;
 using static PowerControlHubApp.Internal.Constants;
+using static PowerControlHubApp.Resources.Localization.AppResources;
 
 namespace PowerControlHubApp.Models.Json;
 
@@ -29,23 +30,23 @@ public class OtaStatusModel
     public string Auto { get; set; } = OtaAuto_Off;
 
     public bool UpdateAvailable =>
-        string.Equals(State, OtaState_Available, StringComparison.OrdinalIgnoreCase);
+        String.Equals(State, OtaState_Available, StringComparison.OrdinalIgnoreCase);
 
     public bool IsBusy =>
         State is OtaState_Checking or OtaState_Downloading or OtaState_Rebooting;
 
     public bool HasFailed =>
-        string.Equals(State, OtaState_Failed, StringComparison.OrdinalIgnoreCase);
+        String.Equals(State, OtaState_Failed, StringComparison.OrdinalIgnoreCase);
 
     /// <summary>Human-readable label shown in the update banner.</summary>
     public string BannerLabel => State switch
     {
-        var s when string.Equals(s, OtaState_Available, StringComparison.OrdinalIgnoreCase) => string.Format(OtaLabel_Available, AvailableVersion, CurrentVersion),
-        var s when string.Equals(s, OtaState_Checking, StringComparison.OrdinalIgnoreCase) => OtaLabel_Checking,
-        var s when string.Equals(s, OtaState_Downloading, StringComparison.OrdinalIgnoreCase) => OtaLabel_Downloading,
-        var s when string.Equals(s, OtaState_Rebooting, StringComparison.OrdinalIgnoreCase) => OtaLabel_Rebooting,
-        var s when string.Equals(s, OtaState_Failed, StringComparison.OrdinalIgnoreCase) => OtaLabel_Failed,
-        var s when string.Equals(s, OtaState_UpToDate, StringComparison.OrdinalIgnoreCase) => string.Format(OtaLabel_Uptodate, CurrentVersion),
-        _ => string.Empty
+        string s when String.Equals(s, OtaState_Available, StringComparison.OrdinalIgnoreCase) => String.Format(OtaLabelAvailable, AvailableVersion, CurrentVersion),
+        string s when String.Equals(s, OtaState_Checking, StringComparison.OrdinalIgnoreCase) => OtaLabelChecking,
+        string s when String.Equals(s, OtaState_Downloading, StringComparison.OrdinalIgnoreCase) => OtaLabelDownloading,
+        string s when String.Equals(s, OtaState_Rebooting, StringComparison.OrdinalIgnoreCase) => OtaLabelRebooting,
+        string s when String.Equals(s, OtaState_Failed, StringComparison.OrdinalIgnoreCase) => OtaLabelFailed,
+        string s when String.Equals(s, OtaState_UpToDate, StringComparison.OrdinalIgnoreCase) => String.Format(OtaLabelUptodate, CurrentVersion),
+        _ => String.Empty
     };
 }