1 files changed, 85 insertions, 7 deletions

diff --git a/src/frontend/app/maps/styleloader.ts b/src/frontend/app/maps/styleloader.ts
index 7d90116..62ab2fc 100644
--- a/src/frontend/app/maps/styleloader.ts
+++ b/src/frontend/app/maps/styleloader.ts
@@ -3,6 +3,7 @@ import type { Theme } from "~/AppContext";
 
 export interface StyleLoaderOptions {
   includeTraffic?: boolean;
+  language?: string;
 }
 
 export const DEFAULT_STYLE: StyleSpecification = {
@@ -13,19 +14,76 @@ export const DEFAULT_STYLE: StyleSpecification = {
   layers: [],
 };
 
+/**
+ * Builds a MapLibre text-field expression that prefers the given language.
+ */
+function buildLanguageTextField(language: string): unknown[] {
+  const lang = language.toLowerCase().split("-")[0];
+  switch (lang) {
+    case "es":
+      return [
+        "coalesce",
+        ["get", "name:es"],
+        ["get", "name:latin"],
+        ["get", "name"],
+      ];
+    case "gl":
+      return [
+        "coalesce",
+        ["get", "name:gl"],
+        ["get", "name:es"],
+        ["get", "name:latin"],
+        ["get", "name"],
+      ];
+    case "en":
+      return [
+        "coalesce",
+        ["get", "name:en"],
+        ["get", "name_en"],
+        ["get", "name:latin"],
+        ["get", "name"],
+      ];
+    default:
+      return ["coalesce", ["get", "name:latin"], ["get", "name"]];
+  }
+}
+
+/**
+ * Returns true for text-field expressions that encode multi-language name
+ * logic (they reference name:latin or name_en). These are the label layers
+ * produced by OpenMapTiles / OpenFreeMap that need localisation.
+ */
+function isMultiLanguageTextField(textField: unknown): boolean {
+  if (!Array.isArray(textField)) return false;
+  const str = JSON.stringify(textField);
+  return str.includes('"name:latin"') || str.includes('"name_en"');
+}
+
+/**
+ * Mutates the loaded style to replace multi-language label expressions with
+ * a localised version appropriate for the given language code.
+ */
+function applyLanguageToStyle(style: any, language: string): void {
+  const newTextField = buildLanguageTextField(language);
+  for (const layer of style.layers ?? []) {
+    if (
+      layer.layout?.["text-field"] &&
+      isMultiLanguageTextField(layer.layout["text-field"])
+    ) {
+      layer.layout["text-field"] = newTextField;
+    }
+  }
+}
+
 export async function loadStyle(
   styleName: string,
   colorScheme: Theme,
   options?: StyleLoaderOptions
 ): Promise<StyleSpecification> {
-  const { includeTraffic = true } = options || {};
+  const { includeTraffic = true, language } = options || {};
 
-  if (colorScheme == "system") {
-    const isDarkMode = window.matchMedia(
-      "(prefers-color-scheme: dark)"
-    ).matches;
-    colorScheme = isDarkMode ? "dark" : "light";
-  }
+  // Always use the light style as the single canonical base style.
+  colorScheme = "light";
 
   if (styleName == "openfreemap") {
     const url = `/maps/styles/openfreemap-${colorScheme}.json`;
@@ -45,6 +103,16 @@ export async function loadStyle(
       delete style.sources?.vigo_traffic;
     }
 
+    // Remove the pseudo-3D building-top layer (fill-translate shadow effect).
+    style.layers = (style.layers || []).filter(
+      (layer: any) => layer.id !== "building-top"
+    );
+
+    // Apply language-aware label expressions.
+    if (language) {
+      applyLanguageToStyle(style, language);
+    }
+
     return style as StyleSpecification;
   }
 
@@ -106,5 +174,15 @@ export async function loadStyle(
     }
   }
 
+  // Remove the pseudo-3D building-top layer.
+  style.layers = (style.layers || []).filter(
+    (layer: any) => layer.id !== "building-top"
+  );
+
+  // Apply language-aware label expressions.
+  if (language) {
+    applyLanguageToStyle(style, language);
+  }
+
   return style as StyleSpecification;
 }