import 'dart:convert';
import 'dart:io';

// Test la route Saint-Martin -> Paris (autoroute avec péage)
// Pour vérifier que la polyline longue se décode correctement en Dart
void main() async {
  final envFile = File('functions/.env');
  final lines = await envFile.readAsLines();
  String apiKey = '';
  for (var line in lines) {
    if (line.startsWith('API_MAPS=')) {
      apiKey = line.split('=')[1].replaceAll('"', '').trim();
    }
  }

  final url = 'https://routes.googleapis.com/directions/v2:computeRoutes';
  final client = HttpClient();
  
  final request = await client.postUrl(Uri.parse(url));
  request.headers.set('Content-Type', 'application/json');
  request.headers.set('X-Goog-Api-Key', apiKey);
  request.headers.set('X-Goog-FieldMask', 'routes.distanceMeters,routes.duration,routes.polyline.encodedPolyline');
  
  final payload = jsonEncode({
    "travelMode": "DRIVE",
    "routingPreference": "TRAFFIC_AWARE",
    "routeModifiers": { "avoidTolls": false },
    "origin": { "address": "401 route du camping, 69850 Saint Martin en haut" },
    "destination": { "address": "Paris, France" }
  });
  
  request.write(payload);
  final response = await request.close();
  final responseBody = await response.transform(utf8.decoder).join();
  
  final json = jsonDecode(responseBody);
  final routes = json['routes'] as List;
  final polyStr = routes[0]['polyline']['encodedPolyline'] as String;
  final dist = routes[0]['distanceMeters'];
  
  print('Distance: ${(dist/1000).round()} km');
  print('Polyline longueur: ${polyStr.length} chars');
  print('Polyline (50 premiers): ${polyStr.substring(0, 50)}');
  
  // Décoder
  final pts = _decodePolyline(polyStr);
  print('Points décodés: ${pts.length}');
  
  // Chercher les points invalides
  var invalides = 0;
  for (final pt in pts) {
    if (pt[0].abs() > 90 || pt[1].abs() > 180) {
      invalides++;
      if (invalides <= 3) print('  *** INVALIDE: ${pt[0]}, ${pt[1]}');
    }
  }
  
  if (invalides == 0) {
    print('✅ Tous les ${pts.length} points sont valides WGS84');
    print('Premier: ${pts[0][0].toStringAsFixed(5)}, ${pts[0][1].toStringAsFixed(5)}');
    print('Dernier: ${pts.last[0].toStringAsFixed(5)}, ${pts.last[1].toStringAsFixed(5)}');
  } else {
    print('❌ $invalides points invalides détectés');
  }
  
  client.close();
}

List<List<double>> _decodePolyline(String encoded) {
  List<List<double>> 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;
    double finalLng = lng / 1e5;
    poly.add([finalLat, finalLng]);
  }
  return poly;
}