fix: polyline decoding bug with large bounds and fix ulys API toll pricing precision

em2rp/functions/src/travel.js

@@ -49,8 +49,14 @@ function loadTollStations() {
 // ─────────────────────────────────────────────
 async function getUlysTollLegs(encodedPolyline) {
   try {
+    // La polyline Google est encodée avec une précision de 5.
+    // L'API Ulys (precision=6) attend une précision de 6.
+    // On la décode (precision 5) puis on la réencode (precision 6).
+    const decodedCoords = polylineLib.decode(encodedPolyline, 5);
+    const polyline6 = polylineLib.encode(decodedCoords, 6);
+
     const url = 'https://api-ulys.azure-api.net/placemark/v2/legs?precision=6&includeLayersIds=GaresPeage';
-    const body = JSON.stringify(encodedPolyline);
+    const body = JSON.stringify(polyline6);
     const res = await axios.post(url, body, {
       headers: {
         'Content-Type': 'application/json',

em2rp/lib/utils/polyline_utils.dart

@@ -0,0 +1,40 @@
+import 'package:latlong2/latlong.dart';
+
+List<LatLng> safeDecodePolyline(String encoded) {
+  if (encoded.isEmpty) return [];
+  try {
+    List<LatLng> poly = [];
+    int index = 0, len = encoded.length;
+    int lat = 0, lng = 0;
+
+    while (index < len) {
+      int b, shift = 0, result = 0;
+      do {
+        if (index >= len) break;
+        b = encoded.codeUnitAt(index++) - 63;
+        result |= (b & 0x1f) << shift;
+        shift += 5;
+      } while (b >= 0x20);
+      int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
+      lat += dlat;
+
+      shift = 0;
+      result = 0;
+      do {
+        if (index >= len) break;
+        b = encoded.codeUnitAt(index++) - 63;
+        result |= (b & 0x1f) << shift;
+        shift += 5;
+      } while (b >= 0x20);
+      int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
+      lng += dlng;
+
+      double finalLat = (lat / 1e5).clamp(-90.0, 90.0);
+      double finalLng = (lng / 1e5).clamp(-180.0, 180.0);
+      poly.add(LatLng(finalLat, finalLng));
+    }
+    return poly;
+  } catch (e) {
+    return [];
+  }
+}

em2rp/lib/views/widgets/common/route_map_widget.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:latlong2/latlong.dart';
 import 'package:em2rp/models/route_result_model.dart';
+import '../../../utils/polyline_utils.dart';
 
 /// Affiche 1 ou 2 itinéraires sur une carte OpenStreetMap.
 /// Route TOLL = bleu, Route TOLL_FREE = vert.
@@ -15,41 +16,8 @@ class RouteMapWidget extends StatelessWidget {
     this.selectedRoute,
   });
 
-  /// Décode une polyline Google encodée en liste de LatLng.
   List<LatLng> _decode(String encoded) {
-    if (encoded.isEmpty) return [];
-    try {
-      final result = <LatLng>[];
-      int index = 0, lat = 0, lng = 0;
-      final len = encoded.length;
-
-      while (index < len) {
-        int shift = 0, result0 = 0;
-        int b;
-        do {
-          b = encoded.codeUnitAt(index++) - 63;
-          result0 |= (b & 0x1f) << shift;
-          shift += 5;
-        } while (b >= 0x20);
-        final dlat = (result0 & 1) != 0 ? ~(result0 >> 1) : (result0 >> 1);
-        lat += dlat;
-
-        shift = 0;
-        result0 = 0;
-        do {
-          b = encoded.codeUnitAt(index++) - 63;
-          result0 |= (b & 0x1f) << shift;
-          shift += 5;
-        } while (b >= 0x20);
-        final dlng = (result0 & 1) != 0 ? ~(result0 >> 1) : (result0 >> 1);
-        lng += dlng;
-
-        result.add(LatLng(lat / 1e5, lng / 1e5));
-      }
-      return result;
-    } catch (e) {
-      return [];
-    }
+    return safeDecodePolyline(encoded);
   }
 
   LatLngBounds? _computeBounds(List<List<LatLng>> allPoints) {