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frontend/src/lib/url-state.ts

@@ -104,3 +104,33 @@ export function stateToParams(
 
   return params;
 }
+
+export function summarizeParams(queryString: string): string {
+  const params = new URLSearchParams(queryString);
+  const parts: string[] = [];
+
+  const f = params.get('f');
+  if (f) {
+    const filterNames = f.split(',').map((seg) => {
+      const colonIdx = seg.indexOf(':');
+      return colonIdx > 0 ? seg.substring(0, colonIdx) : seg;
+    }).filter(Boolean);
+    if (filterNames.length > 0) {
+      parts.push(
+        filterNames.length <= 2
+          ? filterNames.join(', ')
+          : `${filterNames.length} filters`
+      );
+    }
+  }
+
+  const poi = params.get('poi');
+  if (poi) {
+    const count = poi.split(',').filter(Boolean).length;
+    if (count > 0) {
+      parts.push(`${count} POI ${count === 1 ? 'category' : 'categories'}`);
+    }
+  }
+
+  return parts.length > 0 ? parts.join(' + ') : 'No filters';
+}