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lib/helpers/miler_router.dart

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+import 'dart:convert';
+
+import 'package:flutter/foundation.dart';
+import 'package:http/http.dart' as http;
+import 'package:latlong2/latlong.dart' show LatLng;
+
+// ── Routing ─────────────────────────────────────────────────────────────────
+
+/// A driving route between two points, from OSRM's public router.
+///
+/// Replaces the Directions API call, which needed the revoked key. Same shape
+/// of answer — an ordered list of coordinates — so the callers' route drawing,
+/// distance table and camera fitting are untouched.
+class MilerRouter {
+  static const String _host = 'https://router.project-osrm.org';
+
+  /// Sent with every request. OSRM's demo server, like OSM's tile server,
+  /// blocks anonymous clients first.
+  static const String _agent = 'com.doormile.partner';
+
+  /// The road geometry from [start] to [end], or an empty list.
+  ///
+  /// Never throws: a route screen with no line is a degraded screen, but a
+  /// route screen that crashed is a rider standing in the street with nothing.
+  /// Callers fall back to the direct line on an empty answer.
+  static Future<List<LatLng>> route(LatLng start, LatLng end) async {
+    final uri = Uri.parse(
+      '$_host/route/v1/driving/'
+      '${start.longitude},${start.latitude};${end.longitude},${end.latitude}'
+      '?overview=full&geometries=geojson',
+    );
+
+    try {
+      final res = await http
+          .get(uri, headers: const {'User-Agent': _agent})
+          .timeout(const Duration(seconds: 8));
+      if (res.statusCode != 200) {
+        debugPrint(
+          '[MAP] OSRM ${res.statusCode} — falling back to a direct line.',
+        );
+        return const [];
+      }
+
+      final body = jsonDecode(res.body) as Map<String, dynamic>;
+      if (body['code'] != 'Ok') {
+        debugPrint('[MAP] OSRM said ${body['code']} — direct line instead.');
+        return const [];
+      }
+
+      final routes = body['routes'] as List<dynamic>?;
+      if (routes == null || routes.isEmpty) return const [];
+
+      final coords =
+          (routes.first as Map<String, dynamic>)['geometry']['coordinates']
+              as List<dynamic>;
+
+      // GeoJSON is [longitude, latitude] — the opposite order to everything
+      // else in this app, and a silent way to end up routing through the sea.
+      return [
+        for (final c in coords)
+          LatLng((c[1] as num).toDouble(), (c[0] as num).toDouble()),
+      ];
+    } catch (e) {
+      debugPrint('[MAP] OSRM unreachable ($e) — direct line instead.');
+      return const [];
+    }
+  }
+
+  /// Road distance in metres between two points, or null when the router
+  /// cannot answer.
+  ///
+  /// Replaces a direct call to the Google Directions API in
+  /// `PickupsController`, which was reading the same revoked key and therefore
+  /// silently falling back to straight-line distance on every trip — the number
+  /// riders are *paid* on.
+  static Future<double?> roadDistanceMetres(LatLng start, LatLng end) async {
+    final uri = Uri.parse(
+      '$_host/route/v1/driving/'
+      '${start.longitude},${start.latitude};${end.longitude},${end.latitude}'
+      '?overview=false',
+    );
+    try {
+      final res = await http
+          .get(uri, headers: const {'User-Agent': _agent})
+          .timeout(const Duration(seconds: 6));
+      if (res.statusCode != 200) return null;
+      final body = jsonDecode(res.body) as Map<String, dynamic>;
+      if (body['code'] != 'Ok') return null;
+      final routes = body['routes'] as List<dynamic>?;
+      if (routes == null || routes.isEmpty) return null;
+      final d = (routes.first as Map<String, dynamic>)['distance'];
+      return d is num ? d.toDouble() : null;
+    } catch (e) {
+      debugPrint('[ROUTE] OSRM distance unavailable ($e)');
+      return null;
+    }
+  }
+}