UI: Abstract applet launch logic for future potential applets

Optimize locale loading (remove always loading english, that was only needed with the old system)

src/Ryujinx.UI.Common/Helper/AppletMetadata.cs

+using LibHac.Common;
+using LibHac.Ncm;
+using LibHac.Ns;
+using LibHac.Tools.FsSystem.NcaUtils;
+using Ryujinx.HLE;
+using Ryujinx.HLE.FileSystem;
+using Ryujinx.UI.App.Common;
+
+namespace Ryujinx.UI.Common.Helper
+{
+        public readonly struct AppletMetadata
+        {
+            private readonly ContentManager _contentManager;
+            
+            public string Name { get; }
+            public ulong ProgramId { get; }
+            
+            public string Version { get; }
+
+            public AppletMetadata(ContentManager contentManager, string name, ulong programId, string version = "1.0.0") 
+                : this(name, programId, version)
+            {
+                _contentManager = contentManager;
+            }
+            
+            public AppletMetadata(string name, ulong programId, string version = "1.0.0")
+            {
+                Name = name;
+                ProgramId = programId;
+                Version = version;
+            }
+            
+            public string GetContentPath(ContentManager contentManager)
+                => (contentManager ?? _contentManager)
+                    .GetInstalledContentPath(ProgramId, StorageId.BuiltInSystem, NcaContentType.Program);
+
+            public bool CanStart(ContentManager contentManager, out ApplicationData appData, out BlitStruct<ApplicationControlProperty> appControl)
+            {
+                contentManager ??= _contentManager;
+                if (contentManager == null)
+                {
+                    appData = null;
+                    appControl = new BlitStruct<ApplicationControlProperty>(0);
+                    return false;
+                }
+                
+                appData = new()
+                {
+                    Name = Name,
+                    Id = ProgramId,
+                    Path = GetContentPath(contentManager)
+                };
+
+                if (string.IsNullOrEmpty(appData.Path))
+                {
+                    appControl = new BlitStruct<ApplicationControlProperty>(0);
+                    return false;
+                }
+
+                appControl = StructHelpers.CreateCustomNacpData(Name, Version);
+                return true;
+            }
+        }
+}

src/Ryujinx/Common/LocaleManager.cs

 using Gommon;
 using Ryujinx.Ava.UI.ViewModels;
 using Ryujinx.Common;
-using Ryujinx.Common.Logging;
 using Ryujinx.Common.Utilities;
 using Ryujinx.UI.Common.Configuration;
 using System;
@@ -17,7 +16,6 @@ namespace Ryujinx.Ava.Common.Locale
         private const string DefaultLanguageCode = "en_US";
 
         private readonly Dictionary<LocaleKeys, string> _localeStrings;
-        private Dictionary<LocaleKeys, string> _localeDefaultStrings;
         private readonly ConcurrentDictionary<LocaleKeys, object[]> _dynamicValues;
         private string _localeLanguageCode;
 
@@ -27,7 +25,6 @@ namespace Ryujinx.Ava.Common.Locale
         public LocaleManager()
         {
             _localeStrings = new Dictionary<LocaleKeys, string>();
-            _localeDefaultStrings = new Dictionary<LocaleKeys, string>();
             _dynamicValues = new ConcurrentDictionary<LocaleKeys, object[]>();
 
             Load();
@@ -37,9 +34,7 @@ namespace Ryujinx.Ava.Common.Locale
         {
             var localeLanguageCode = !string.IsNullOrEmpty(ConfigurationState.Instance.UI.LanguageCode.Value) ?
                 ConfigurationState.Instance.UI.LanguageCode.Value : CultureInfo.CurrentCulture.Name.Replace('-', '_');
-
-            // Load en_US as default, if the target language translation is missing or incomplete.
-            LoadDefaultLanguage();
+            
             LoadLanguage(localeLanguageCode);
 
             // Save whatever we ended up with.
@@ -66,26 +61,14 @@ namespace Ryujinx.Ava.Common.Locale
                         }
                         catch
                         {
-                            // If formatting failed use the default text instead.
-                            if (_localeDefaultStrings.TryGetValue(key, out value))
-                                try
-                                {
-                                    return string.Format(value, dynamicValue);
-                                }
-                                catch
-                                {
-                                    // If formatting the default text failed return the key.
-                                    return key.ToString();
-                                }
+                            // If formatting the text failed,
+                            // continue to the below line & return the text without formatting.
                         }
 
                     return value;
                 }
-
-                // If the locale doesn't contain the key return the default one.
-                return _localeDefaultStrings.TryGetValue(key, out string defaultValue)
-                    ? defaultValue
-                    : key.ToString(); // If the locale text doesn't exist return the key.
+                
+                return key.ToString(); // If the locale text doesn't exist return the key.
             }
             set
             {
@@ -114,11 +97,6 @@ namespace Ryujinx.Ava.Common.Locale
             return this[key];
         }
 
-        private void LoadDefaultLanguage()
-        {
-            _localeDefaultStrings = LoadJsonLanguage(DefaultLanguageCode);
-        }
-
         public void LoadLanguage(string languageCode)
         {
             var locale = LoadJsonLanguage(languageCode);
@@ -126,7 +104,7 @@ namespace Ryujinx.Ava.Common.Locale
             if (locale == null)
             {
                 _localeLanguageCode = DefaultLanguageCode;
-                locale = _localeDefaultStrings;
+                locale = LoadJsonLanguage(_localeLanguageCode);
             }
             else
             {
@@ -167,15 +145,16 @@ namespace Ryujinx.Ava.Common.Locale
                 if (!Enum.TryParse<LocaleKeys>(locale.ID, out var localeKey))
                     continue;
 
-                localeStrings[localeKey] =
-                    locale.Translations.TryGetValue(languageCode, out string val) && !string.IsNullOrEmpty(val)
-                        ? val
-                        : locale.Translations[DefaultLanguageCode];
-
-                if (string.IsNullOrEmpty(localeStrings[localeKey]))
+                var str = locale.Translations.TryGetValue(languageCode, out string val) && !string.IsNullOrEmpty(val)
+                    ? val
+                    : locale.Translations[DefaultLanguageCode];
+                
+                if (string.IsNullOrEmpty(str))
                 {
                     throw new Exception($"Locale key '{locale.ID}' has no valid translations for desired language {languageCode}! {DefaultLanguageCode} is an empty string or null");
                 }
+
+                localeStrings[localeKey] = str;
             }
 
             return localeStrings;

src/Ryujinx/UI/Views/Main/MainMenuBarView.axaml.cs

@@ -3,8 +3,6 @@ using Avalonia.Controls;
 using Avalonia.Interactivity;
 using Avalonia.Threading;
 using Gommon;
-using LibHac.Ncm;
-using LibHac.Tools.FsSystem.NcaUtils;
 using Ryujinx.Ava.Common.Locale;
 using Ryujinx.Ava.UI.Helpers;
 using Ryujinx.Ava.UI.ViewModels;
@@ -12,8 +10,6 @@ using Ryujinx.Ava.UI.Windows;
 using Ryujinx.Common;
 using Ryujinx.Common.Utilities;
 using Ryujinx.HLE.HOS.Services.Nfc.AmiiboDecryption;
-using Ryujinx.HLE;
-using Ryujinx.UI.App.Common;
 using Ryujinx.UI.Common;
 using Ryujinx.UI.Common.Configuration;
 using Ryujinx.UI.Common.Helper;
@@ -124,26 +120,13 @@ namespace Ryujinx.Ava.UI.Views.Main
             ViewModel.LoadConfigurableHotKeys();
         }
 
+        public static readonly AppletMetadata MiiApplet = new("miiEdit", 0x0100000000001009);
+
         public async void OpenMiiApplet(object sender, RoutedEventArgs e)
         {
-            const string AppletName = "miiEdit";
-            const ulong AppletProgramId = 0x0100000000001009;
-            const string AppletVersion = "1.0.0";
-            
-            string contentPath = ViewModel.ContentManager.GetInstalledContentPath(AppletProgramId, StorageId.BuiltInSystem, NcaContentType.Program);
-
-            if (!string.IsNullOrEmpty(contentPath))
+            if (MiiApplet.CanStart(ViewModel.ContentManager, out var appData, out var nacpData))
             {
-                ApplicationData applicationData = new()
-                {
-                    Name = AppletName,
-                    Id = AppletProgramId,
-                    Path = contentPath
-                };
-                
-                var nacpData = StructHelpers.CreateCustomNacpData(AppletName, AppletVersion);
-
-                await ViewModel.LoadApplication(applicationData, ViewModel.IsFullScreen || ViewModel.StartGamesInFullscreen, nacpData);
+                await ViewModel.LoadApplication(appData, ViewModel.IsFullScreen || ViewModel.StartGamesInFullscreen, nacpData);
             }
         }