import 'dart:convert';
import 'package:http/http.dart' as http;

/// Service in charge of dispatching SOS events to a backend endpoint.
///
/// The backend is expected to accept POST JSON payloads like:
/// {
///   "tripId": "...",
///   "lat": 0.0,
///   "lng": 0.0,
///   "message": "...",
/// }
class SosService {
  /// Base URL of the backend (e.g. https://api.example.com/sos).
  final String baseUrl;

  /// Optional API key header.
  final String? apiKey;

  /// Optional injected HTTP client (useful for testing).
  final http.Client _client;

  /// Creates a new SOS service.
  SosService({required this.baseUrl, this.apiKey, http.Client? client})
    : _client = client ?? http.Client();

  /// Sends an SOS event. Returns true on HTTP 200.
  Future<bool> sendSos({
    required String tripId,
    required double lat,
    required double lng,
    String message = 'SOS déclenché',
  }) async {
    final uri = Uri.parse('$baseUrl/sos');
    try {
      final response = await _client.post(
        uri,
        headers: {
          'Content-Type': 'application/json',
          if (apiKey != null) 'Authorization': 'Bearer $apiKey',
        },
        body: json.encode({
          'tripId': tripId,
          'lat': lat,
          'lng': lng,
          'message': message,
        }),
      );
      return response.statusCode == 200;
    } catch (_) {
      return false;
    }
  }
}