feat(travel): implement Mapbox route recreation using Mapbox Directions API

em2rp/functions/src/travel.js

@@ -49,16 +49,52 @@ function loadTollStations() {
 // ─────────────────────────────────────────────
 async function getUlysTollLegs(encodedPolyline) {
   try {
-    const url = 'https://api-ulys.azure-api.net/placemark/v2/legs?precision=6&includeLayersIds=GaresPeage';
+    const polylineCoords = polylineLib.decode(encodedPolyline);
-    const body = JSON.stringify(encodedPolyline);
+    const ulysUrl = 'https://api-ulys.azure-api.net/placemark/v2/legs?precision=5&includeLayersIds=GaresPeage';
-    const res = await axios.post(url, body, {
+    let finalPolyline = encodedPolyline;
+    
+    // OPTION 1 : Mapbox Route Recreation
+    if (process.env.MAPBOX_API_KEY && polylineCoords.length > 2) {
+      logger.info('[Travel] MAPBOX_API_KEY is present. Recreating route with Mapbox for Ulys precision...');
+      try {
+        // Extraire jusqu'à 25 waypoints (limite Mapbox Directions API) équidistants
+        const maxWaypoints = 25;
+        const waypoints = [];
+        const step = Math.max(1, Math.floor(polylineCoords.length / (maxWaypoints - 1)));
+        for (let i = 0; i < polylineCoords.length; i += step) {
+           waypoints.push(polylineCoords[i]);
+        }
+        if (waypoints[waypoints.length - 1] !== polylineCoords[polylineCoords.length - 1]) {
+           waypoints[waypoints.length - 1] = polylineCoords[polylineCoords.length - 1]; // Ensure last point is exactly destination
+        }
+        
+        // Mapbox expects longitude,latitude
+        const coordinatesString = waypoints.map(p => `${p[1]},${p[0]}`).join(';');
+        const mapboxUrl = `https://api.mapbox.com/directions/v5/mapbox/driving/${coordinatesString}?geometries=polyline&overview=full&access_token=${process.env.MAPBOX_API_KEY}`;
+        
+        const mapboxRes = await axios.get(mapboxUrl);
+        if (mapboxRes.data && mapboxRes.data.routes && mapboxRes.data.routes.length > 0) {
+            finalPolyline = mapboxRes.data.routes[0].geometry;
+            logger.info('[Travel] Mapbox route recreation successful.');
+        }
+      } catch (mapboxErr) {
+        logger.error('[Travel] Mapbox API error:', mapboxErr.response ? mapboxErr.response.data : mapboxErr.message);
+        // Fallback to Google Maps polyline if Mapbox fails
+      }
+    }
+
+    // Appeler Ulys /legs
+    const res = await axios.post(
+      ulysUrl,
+      JSON.stringify(finalPolyline),
+      {
         headers: {
           'Content-Type': 'application/json',
-        'Content-Length': Buffer.byteLength(body).toString(),
+          'Host': 'api-ulys.azure-api.net'
-        'Host': 'api-ulys.azure-api.net',
         },
         timeout: 10000,
-    });
+      }
+    );
     return res.data;
   } catch (e) {
     logger.warn('[Travel] Ulys /legs failed:', e.message);