deploy

frontend/src/lib/travel-params.ts

@@ -1,5 +1,44 @@
 import type { TravelTimeEntry } from '../hooks/useTravelTime';
 
+function mergeTimeRanges(
+  current: [number, number] | null,
+  next: [number, number] | null
+): [number, number] | null {
+  if (!current) return next;
+  if (!next) return current;
+  return [Math.max(current[0], next[0]), Math.min(current[1], next[1])];
+}
+
+export function dedupeTravelTimeEntries(entries: TravelTimeEntry[]): TravelTimeEntry[] {
+  const result: TravelTimeEntry[] = [];
+  const indexByKey = new Map<string, number>();
+
+  for (const entry of entries) {
+    if (!entry.slug) {
+      result.push(entry);
+      continue;
+    }
+
+    const key = `${entry.mode}:${entry.slug}`;
+    const existingIndex = indexByKey.get(key);
+    if (existingIndex == null) {
+      indexByKey.set(key, result.length);
+      result.push({ ...entry });
+      continue;
+    }
+
+    const existing = result[existingIndex];
+    result[existingIndex] = {
+      ...existing,
+      label: existing.label || entry.label,
+      timeRange: mergeTimeRanges(existing.timeRange, entry.timeRange),
+      useBest: existing.useBest || entry.useBest,
+    };
+  }
+
+  return result;
+}
+
 export function buildTravelParam(
   entries: TravelTimeEntry[],
   excludeFieldKey?: string,
@@ -7,7 +46,7 @@ export function buildTravelParam(
 ): string {
   const segments: string[] = [];
 
-  for (const entry of entries) {
+  for (const entry of dedupeTravelTimeEntries(entries)) {
     if (!entry.slug) continue;
 
     let segment = `${entry.mode}:${entry.slug}`;