1 files changed, 105 insertions, 0 deletions
diff --git a/Ryujinx.Ava/Common/Locale/LocaleManager.cs b/Ryujinx.Ava/Common/Locale/LocaleManager.cs
new file mode 100644
index 00000000..daa0328f
--- /dev/null
+++ b/Ryujinx.Ava/Common/Locale/LocaleManager.cs
@@ -0,0 +1,105 @@
+using Ryujinx.Ava.Ui.ViewModels;
+using Ryujinx.Common;
+using Ryujinx.Ui.Common.Configuration;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Text.Json;
+
+namespace Ryujinx.Ava.Common.Locale
+{
+    class LocaleManager : BaseModel
+    {
+        private const string DefaultLanguageCode = "en_US";
+
+        private Dictionary<string, string> _localeStrings;
+        private ConcurrentDictionary<string, object[]> _dynamicValues;
+
+        public static LocaleManager Instance { get; } = new LocaleManager();
+        public Dictionary<string, string> LocaleStrings { get => _localeStrings; set => _localeStrings = value; }
+
+
+        public LocaleManager()
+        {
+            _localeStrings = new Dictionary<string, string>();
+            _dynamicValues = new ConcurrentDictionary<string, object[]>();
+
+            Load();
+        }
+
+        public void Load()
+        {
+            string localeLanguageCode = CultureInfo.CurrentCulture.Name.Replace('-', '_');
+
+            if (Program.PreviewerDetached)
+            {
+                if (!string.IsNullOrEmpty(ConfigurationState.Instance.Ui.LanguageCode.Value))
+                {
+                    localeLanguageCode = ConfigurationState.Instance.Ui.LanguageCode.Value;
+                }
+            }
+
+            // Load english first, if the target language translation is incomplete, we default to english.
+            LoadLanguage(DefaultLanguageCode);
+
+            if (localeLanguageCode != DefaultLanguageCode)
+            {
+                LoadLanguage(localeLanguageCode);
+            }
+        }
+
+        public string this[string key]
+        {
+            get
+            {
+                if (_localeStrings.TryGetValue(key, out string value))
+                {
+                    if (_dynamicValues.TryGetValue(key, out var dynamicValue))
+                    {
+                        return string.Format(value, dynamicValue);
+                    }
+
+                    return value;
+                }
+
+                return key;
+            }
+            set
+            {
+                _localeStrings[key] = value;
+
+                OnPropertyChanged();
+            }
+        }
+
+        public void UpdateDynamicValue(string key, params object[] values)
+        {
+            _dynamicValues[key] = values;
+
+            OnPropertyChanged("Item");
+        }
+
+        public void LoadLanguage(string languageCode)
+        {
+            string languageJson = EmbeddedResources.ReadAllText($"Ryujinx.Ava/Assets/Locales/{languageCode}.json");
+
+            if (languageJson == null)
+            {
+                return;
+            }
+
+            var strings = JsonSerializer.Deserialize<Dictionary<string, string>>(languageJson);
+
+            foreach (var item in strings)
+            {
+                this[item.Key] = item.Value;
+            }
+
+            if (Program.PreviewerDetached)
+            {
+                ConfigurationState.Instance.Ui.LanguageCode.Value = languageCode;
+                ConfigurationState.Instance.ToFileFormat().SaveConfig(Program.ConfigurationPath);
+            }
+        }
+    }
+}
+\ No newline at end of file