1 files changed, 160 insertions, 0 deletions
diff --git a/src/Ryujinx/Common/Locale/LocaleManager.cs b/src/Ryujinx/Common/Locale/LocaleManager.cs
new file mode 100644
index 00000000..e973fcc0
--- /dev/null
+++ b/src/Ryujinx/Common/Locale/LocaleManager.cs
@@ -0,0 +1,160 @@
+using Ryujinx.Ava.UI.ViewModels;
+using Ryujinx.Common;
+using Ryujinx.Common.Utilities;
+using Ryujinx.UI.Common.Configuration;
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Globalization;
+
+namespace Ryujinx.Ava.Common.Locale
+{
+    class LocaleManager : BaseModel
+    {
+        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;
+
+        public static LocaleManager Instance { get; } = new();
+        public event Action LocaleChanged;
+
+        public LocaleManager()
+        {
+            _localeStrings = new Dictionary<LocaleKeys, string>();
+            _localeDefaultStrings = new Dictionary<LocaleKeys, string>();
+            _dynamicValues = new ConcurrentDictionary<LocaleKeys, object[]>();
+
+            Load();
+        }
+
+        public void Load()
+        {
+            // Load the system Language Code.
+            string localeLanguageCode = CultureInfo.CurrentCulture.Name.Replace('-', '_');
+
+            // If the view is loaded with the UI Previewer detached, then override it with the saved one or default.
+            if (Program.PreviewerDetached)
+            {
+                if (!string.IsNullOrEmpty(ConfigurationState.Instance.UI.LanguageCode.Value))
+                {
+                    localeLanguageCode = ConfigurationState.Instance.UI.LanguageCode.Value;
+                }
+                else
+                {
+                    localeLanguageCode = DefaultLanguageCode;
+                }
+            }
+
+            // Load en_US as default, if the target language translation is incomplete.
+            LoadDefaultLanguage();
+
+            LoadLanguage(localeLanguageCode);
+        }
+
+        public string this[LocaleKeys key]
+        {
+            get
+            {
+                // Check if the locale contains the key.
+                if (_localeStrings.TryGetValue(key, out string value))
+                {
+                    // Check if the localized string needs to be formatted.
+                    if (_dynamicValues.TryGetValue(key, out var dynamicValue))
+                    {
+                        try
+                        {
+                            return string.Format(value, dynamicValue);
+                        }
+                        catch (Exception)
+                        {
+                            // If formatting failed use the default text instead.
+                            if (_localeDefaultStrings.TryGetValue(key, out value))
+                            {
+                                try
+                                {
+                                    return string.Format(value, dynamicValue);
+                                }
+                                catch (Exception)
+                                {
+                                    // If formatting the default text failed return the key.
+                                    return key.ToString();
+                                }
+                            }
+                        }
+                    }
+
+                    return value;
+                }
+
+                // If the locale doesn't contain the key return the default one.
+                if (_localeDefaultStrings.TryGetValue(key, out string defaultValue))
+                {
+                    return defaultValue;
+                }
+
+                // If the locale text doesn't exist return the key.
+                return key.ToString();
+            }
+            set
+            {
+                _localeStrings[key] = value;
+
+                OnPropertyChanged();
+            }
+        }
+
+        public bool IsRTL()
+        {
+            return _localeLanguageCode switch
+            {
+                "he_IL" => true,
+                _ => false
+            };
+        }
+
+        public string UpdateAndGetDynamicValue(LocaleKeys key, params object[] values)
+        {
+            _dynamicValues[key] = values;
+
+            OnPropertyChanged("Item");
+
+            return this[key];
+        }
+
+        private void LoadDefaultLanguage()
+        {
+            _localeDefaultStrings = LoadJsonLanguage();
+        }
+
+        public void LoadLanguage(string languageCode)
+        {
+            foreach (var item in LoadJsonLanguage(languageCode))
+            {
+                this[item.Key] = item.Value;
+            }
+
+            _localeLanguageCode = languageCode;
+            LocaleChanged?.Invoke();
+        }
+
+        private static Dictionary<LocaleKeys, string> LoadJsonLanguage(string languageCode = DefaultLanguageCode)
+        {
+            var localeStrings = new Dictionary<LocaleKeys, string>();
+            string languageJson = EmbeddedResources.ReadAllText($"Ryujinx/Assets/Locales/{languageCode}.json");
+            var strings = JsonHelper.Deserialize(languageJson, CommonJsonContext.Default.StringDictionary);
+
+            foreach (var item in strings)
+            {
+                if (Enum.TryParse<LocaleKeys>(item.Key, out var key))
+                {
+                    localeStrings[key] = item.Value;
+                }
+            }
+
+            return localeStrings;
+        }
+    }
+}