commited what i had

Author: johnklipi

src/Loader.cs

@@ -746,6 +746,12 @@ public static void LoadAssetBundle(Mod mod, Mod.File file)
 		);
 	}
 
+	public static void LoadLanguageFile(Mod mod, Mod.File file, string languageName)
+	{
+		var dict = JsonSerializer.Deserialize<Dictionary<string, string>>(file.bytes);
+		Loc.BuildAndLoadCustomLanguage(languageName, dict);
+	}
+
 	/// <summary>
 	/// Processes the merged game logic data after all mods have been loaded and patched.
 	/// </summary>

src/Managers/Loc.cs

@@ -12,6 +12,9 @@ namespace PolyMod.Managers;
 /// </summary>
 public static class Loc
 {
+	public record TermInfo(string term, string localizedString);
+	internal static Dictionary<int, string> languagesToAdd = new();
+
 	/// <summary>
 	/// Patches the tribe selection popup to correctly display descriptions for custom skins.
 	/// </summary>
@@ -112,6 +115,62 @@ public static void BuildAndLoadLocalization(Dictionary<string, Dictionary<string
 		}
 	}
 
+	[HarmonyPrefix]
+	[HarmonyPatch(typeof(SettingsScreen), nameof(SettingsScreen.LanguageChangedCallback))]
+	public static bool LanguageChangedCallback(SettingsScreen __instance, int index)
+	{
+		Console.Write("LanguageChangedCallback");
+		Console.Write(index);
+		Il2CppSystem.Nullable<int> il2cppNullable = __instance.languageSelector.GetIdForIndex(index);
+		Console.Write(il2cppNullable.HasValue);
+		if (!il2cppNullable.HasValue)
+		{
+			var allLanguages = LocalizationManager.GetAllLanguages();
+			string languageName = allLanguages[index];
+			string languageCode = LocalizationManager.GetLanguageCode(languageName);
+			Console.Write(languageCode);
+			SettingsUtils.Language = languageCode;
+			LocalizationManager.CurrentLanguage = languageName;
+			UINavigationManager.Select(__instance.languageSelector.GetCurrentSelectable());
+		}
+		else
+		{
+			Console.Write(il2cppNullable.Value);
+		}
+		return il2cppNullable.HasValue;
+	}
+	public static void BuildAndLoadCustomLanguage(string name, Dictionary<string, string> terms)
+	{
+		LanguageSourceData source = LocalizationManager.Sources[0];
+		int languageIndex = source.GetLanguageIndex(name);
+		string languageName = terms["language"];
+		if (languageIndex == -1)
+		{
+			source.AddLanguage(terms["language"], name);
+			languageIndex = source.GetLanguageIndex(languageName);
+			languagesToAdd[languageIndex] = terms["language"];
+			Console.Write($"{name} language added.");
+		}
+
+		foreach (var kvp in terms)
+		{
+			TermData term = source.GetTermData(kvp.Key);
+			if (term == null)
+			{
+				source.AddTerm(kvp.Key);
+				term = source.GetTermData(kvp.Key);
+			}
+
+			term.Languages[languageIndex] = kvp.Value;
+		}
+
+		LocalizationManager.UpdateSources();
+
+		// LocalizationManager.CurrentLanguage = name;
+
+		Console.Write($"{name} strings added and language activated!");
+	}
+
 	/// <summary>
 	/// Initializes the Loc manager by patching the necessary methods.
 	/// </summary>

src/Managers/Main.cs

@@ -415,14 +415,27 @@ internal static void Load(GameLogicData gameLogicData, JObject json)
 					);
 					continue;
 				}
-				if (Regex.IsMatch(Path.GetFileName(file.name), @"^prefab(_.*)?\.json$"))
+				Match prefabMatch = Regex.Match(Path.GetFileName(file.name), @"^prefab(?:_(.*))?\.json$");
+				if (prefabMatch.Success)
 				{
 					Loader.LoadPrefabInfoFile(
 						mod,
 						file
 					);
 					continue;
 				}
+				Match languageMatch = Regex.Match(Path.GetFileName(file.name), @"^language(?:_(.*))?\.json$");
+				if (languageMatch.Success)
+				{
+					string languageName = languageMatch.Groups[1].Value;
+					Console.WriteLine(languageName); 
+					Loader.LoadLanguageFile(
+						mod,
+						file,
+						languageName
+					);
+					continue;
+				}
 
 				switch (Path.GetExtension(file.name))
 				{

src/Managers/Visual.cs

@@ -617,6 +617,23 @@ private static void PopupBase_Hide(PopupBase __instance)
 		basicPopupWidths.Remove(__instance.GetInstanceID());
 	}
 
+	[HarmonyPostfix]
+	[HarmonyPatch(typeof(SettingsScreen), nameof(SettingsScreen.CreateLanguageList))]
+	private static void CreateLanguageList(SettingsScreen __instance, Transform parent)
+	{
+		foreach (KeyValuePair<int, string> language in Loc.languagesToAdd)
+		{
+			List<string> keys = __instance.languageSelector.data.ToList();
+			List<int> ids = __instance.languageSelector.ids.ToList();
+			keys.Add(language.Value);
+			ids.Add(language.Key);
+			__instance.languageSelector.SetData(keys.ToArray(), ids.ToArray(), 0, false);
+			Console.Write("CreateLanguageList");
+			Console.Write(language.Key);
+			Console.Write(__instance.languageSelector.ids.Length);
+		}
+	}
+
 	/// <summary>Shows a basic popup with a custom width.</summary>
 	public static void ShowSetWidth(this BasicPopup self, int width)
 	{

src/Registry.cs

@@ -86,6 +86,7 @@ public static class Registry
 	/// </summary>
 	public static int gameModesAutoidx = Enum.GetValues(typeof(GameMode)).Length;
 
+	public static List<Loc.TermInfo> languageInfo = new();
 	/// <summary>
 	/// Gets a sprite from the registry, trying to find the best match.
 	/// </summary>