360 lines
11 KiB
Dart
360 lines
11 KiB
Dart
import 'dart:async';
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import 'package:flutter/foundation.dart';
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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import 'package:flutter_tts/flutter_tts.dart';
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import 'package:geolocator/geolocator.dart';
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import '../location_service.dart';
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import 'road_alert_models.dart';
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import 'road_alert_providers.dart';
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import '../field_test/field_test_logger.dart';
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import '../../models/field_test_event.dart';
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final roadAlertServiceProvider = Provider<RoadAlertService>((ref) {
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final service = RoadAlertService(ref);
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ref.onDispose(() => service.dispose());
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return service;
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});
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final activeAlertsStreamProvider = StreamProvider<List<RoadAlert>>((ref) {
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return ref.watch(roadAlertServiceProvider).alertsStream;
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});
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class RoadAlertService {
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final Ref _ref;
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final FlutterTts _tts = FlutterTts();
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final _alertsController = StreamController<List<RoadAlert>>.broadcast();
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StreamSubscription<Position>? _locationSub;
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DateTime? _lastFetchTime;
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Position? _lastFetchPosition;
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bool _isFetching = false; // Request serialization lock
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DateTime? _lastSpeechTime; // Audio cooldown timer
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List<RoadAlert> _cachedAlerts = [];
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final Set<String> _announcedAlertIds = {};
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Stream<List<RoadAlert>> get alertsStream => _alertsController.stream;
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RoadAlertService(this._ref) {
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_initTts();
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_startListening();
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}
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void _initTts() {
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try {
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_tts.setLanguage("en-US");
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_tts.setSpeechRate(0.5);
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_tts.setVolume(1.0);
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} catch (e) {
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if (kDebugMode) {
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debugPrint('[RoadAlerts] TTS init warning: $e');
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}
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}
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}
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void _startListening() {
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if (kDebugMode) {
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debugPrint('[RoadAlerts] Service initialized');
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}
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_locationSub = _ref.read(locationServiceProvider).getFilteredPositionStream().listen((position) {
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_processPosition(position);
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});
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}
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Future<void> _processPosition(Position position) async {
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final isEnabled = _ref.read(roadAlertsEnabledProvider);
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if (!isEnabled) {
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if (_cachedAlerts.isNotEmpty) {
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_cachedAlerts = [];
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_alertsController.add([]);
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}
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return;
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}
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final now = DateTime.now();
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final radiusMeters = _ref.read(alertRadiusMetersProvider);
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final audioEnabled = _ref.read(audioAlertsEnabledProvider);
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final enabledCategories = _ref.read(enabledCategoriesProvider);
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final tomtomApiKey = _ref.read(tomtomApiKeyProvider);
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final communityApiKey = _ref.read(communityApiKeyProvider);
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// Request serialization check: prevent overlapping queries
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bool shouldFetch = false;
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if (!_isFetching) {
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if (_lastFetchTime == null || now.difference(_lastFetchTime!).inSeconds >= 45) {
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shouldFetch = true;
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} else if (_lastFetchPosition != null) {
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final dist = Geolocator.distanceBetween(
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_lastFetchPosition!.latitude,
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_lastFetchPosition!.longitude,
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position.latitude,
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position.longitude,
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);
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if (dist > 500.0) {
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shouldFetch = true;
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}
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}
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}
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if (shouldFetch) {
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_isFetching = true;
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_lastFetchTime = now;
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_lastFetchPosition = position;
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try {
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await _fetchAlertsFromProviders(
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position.latitude,
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position.longitude,
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radiusMeters,
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tomtomApiKey: tomtomApiKey,
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communityApiKey: communityApiKey,
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);
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} finally {
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_isFetching = false;
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}
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}
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// Process cached alerts & filter out expired ones
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final Map<String, RoadAlert> deduplicated = {};
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for (var alert in _cachedAlerts) {
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if (alert.expiresAt != null && alert.expiresAt!.isBefore(now)) {
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continue;
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}
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if (!enabledCategories.contains(alert.category)) {
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continue;
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}
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final dist = Geolocator.distanceBetween(
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position.latitude,
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position.longitude,
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alert.latitude,
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alert.longitude,
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);
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if (dist <= radiusMeters * 1.5) {
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final updatedAlert = alert.copyWith(distanceFromUser: dist);
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final key = '${alert.providerId}_${alert.id}';
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deduplicated[key] = updatedAlert;
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// Approach Audio Warning with 4-second speech cooldown
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if (audioEnabled && dist <= 400.0 && !_announcedAlertIds.contains(key)) {
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final isAhead = _isAlertAheadOfRider(position, alert);
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if (isAhead) {
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final speechTime = DateTime.now();
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if (_lastSpeechTime == null || speechTime.difference(_lastSpeechTime!).inSeconds >= 4) {
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_lastSpeechTime = speechTime;
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_announcedAlertIds.add(key);
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_announceAlertAudio(updatedAlert);
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}
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}
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}
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}
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}
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final resultList = deduplicated.values.toList()
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..sort((a, b) => (a.distanceFromUser ?? 0).compareTo(b.distanceFromUser ?? 0));
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_cachedAlerts = resultList;
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_alertsController.add(resultList);
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}
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bool _isAlertAheadOfRider(Position userPos, RoadAlert alert) {
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if (userPos.speed < 2.0) return true;
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final riderHeading = userPos.heading;
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final bearingToAlert = Geolocator.bearingBetween(
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userPos.latitude,
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userPos.longitude,
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alert.latitude,
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alert.longitude,
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);
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double delta = (bearingToAlert - riderHeading).abs();
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if (delta > 180) delta = 360 - delta;
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return delta <= 100.0;
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}
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Future<void> _fetchAlertsFromProviders(
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double lat,
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double lng,
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double radiusMeters, {
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required String tomtomApiKey,
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required String communityApiKey,
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}) async {
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final providers = _ref.read(activeRoadAlertProviders);
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final List<RoadAlert> newAlerts = [];
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if (kDebugMode) {
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debugPrint('[RoadAlerts] Fetching alerts from ${providers.length} providers...');
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}
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for (var provider in providers) {
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try {
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String? key;
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if (provider.id == 'tomtom') key = tomtomApiKey;
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if (provider.id == 'community_traffic') key = communityApiKey;
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final fetched = await provider.getAlerts(
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latitude: lat,
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longitude: lng,
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radiusMeters: radiusMeters,
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apiKey: key,
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);
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newAlerts.addAll(fetched);
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try {
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for (var a in fetched) {
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_ref.read(fieldTestLoggerProvider).log(
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eventType: FieldTestEventType.roadAlertReceived,
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severity: EventSeverity.info,
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message: '[${provider.id}] ${a.category.displayName}: ${a.description}',
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metadata: {
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'providerId': provider.id,
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'category': a.category.displayName,
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'distanceMeters': a.distanceFromUser,
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},
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);
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}
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} catch (_) {}
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} catch (e) {
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if (kDebugMode) {
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debugPrint('[RoadAlerts] Provider ${provider.id} error: $e');
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}
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try {
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_ref.read(fieldTestLoggerProvider).log(
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eventType: FieldTestEventType.networkError,
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severity: EventSeverity.warning,
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message: 'Road alert provider ${provider.id} failure: $e',
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);
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} catch (_) {}
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}
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}
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_cachedAlerts = newAlerts;
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if (kDebugMode) {
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debugPrint('[RoadAlerts] Active cached alerts count: ${_cachedAlerts.length}');
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}
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}
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void _announceAlertAudio(RoadAlert alert) {
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String phrase;
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switch (alert.category) {
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case RoadAlertCategory.police:
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phrase = "Police report ahead.";
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break;
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case RoadAlertCategory.speedCamera:
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phrase = "Speed camera reported ahead.";
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break;
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case RoadAlertCategory.accident:
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phrase = "Accident reported ahead.";
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break;
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case RoadAlertCategory.hazard:
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phrase = "Road hazard ahead.";
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break;
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case RoadAlertCategory.roadClosure:
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phrase = "Road closure ahead.";
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break;
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case RoadAlertCategory.construction:
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phrase = "Construction zone ahead.";
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break;
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case RoadAlertCategory.traffic:
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phrase = "Traffic delay ahead.";
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break;
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case RoadAlertCategory.other:
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phrase = "Traffic alert ahead.";
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break;
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}
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if (kDebugMode) {
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debugPrint('[RoadAlerts] Announcing audio alert: $phrase');
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}
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try {
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_tts.speak(phrase);
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_ref.read(fieldTestLoggerProvider).log(
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eventType: FieldTestEventType.ttsAnnounced,
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severity: EventSeverity.info,
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message: 'TTS Announced: "$phrase"',
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);
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} catch (e) {
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if (kDebugMode) {
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debugPrint('[RoadAlerts] TTS speak error: $e');
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}
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_ref.read(fieldTestLoggerProvider).log(
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eventType: FieldTestEventType.audioFailure,
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severity: EventSeverity.warning,
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message: 'TTS error speaking "$phrase": $e',
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);
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}
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}
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void triggerTestAlert({RoadAlertCategory category = RoadAlertCategory.police}) {
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final now = DateTime.now();
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final pos = _lastFetchPosition;
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// 150 meters ahead of current location
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final lat = pos != null ? pos.latitude + 0.0012 : 34.0620;
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final lng = pos != null ? pos.longitude + 0.0008 : -85.2330;
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final testAlert = RoadAlert(
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id: 'test_alert_${now.millisecondsSinceEpoch}',
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providerId: 'diagnostic_test',
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category: category,
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latitude: lat,
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longitude: lng,
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description: 'TEST ALERT: ${category.displayName} reported ahead (Diagnostic Verification)',
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roadName: 'Test Way / Simulation',
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reportedAt: now,
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expiresAt: now.add(const Duration(minutes: 5)),
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lastUpdated: now,
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distanceFromUser: 150.0,
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source: 'Internal Pipeline Test',
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sourceType: RoadAlertSourceType.providerReported,
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);
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if (kDebugMode) {
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debugPrint('[RoadAlerts] [TEST ALERT] Injected: ${testAlert.description}');
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}
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_cachedAlerts = [testAlert, ..._cachedAlerts.where((a) => !a.id.startsWith('test_alert_'))];
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_alertsController.add(_cachedAlerts);
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final phrase = "TEST ALERT: ${category.displayName} reported ahead.";
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try {
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_tts.speak(phrase);
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_ref.read(fieldTestLoggerProvider).log(
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eventType: FieldTestEventType.ttsAnnounced,
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severity: EventSeverity.info,
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message: 'TTS Test Alert: "$phrase"',
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);
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} catch (e) {
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if (kDebugMode) {
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debugPrint('[RoadAlerts] TTS speak error for test alert: $e');
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}
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}
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}
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void simulateAlert(RoadAlert alert) {
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if (!_ref.read(roadAlertsEnabledProvider)) return;
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_cachedAlerts = [alert, ..._cachedAlerts];
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_alertsController.add(_cachedAlerts);
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if (_ref.read(audioAlertsEnabledProvider)) {
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_announceAlertAudio(alert);
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}
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}
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void dispose() {
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if (kDebugMode) {
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debugPrint('[RoadAlerts] Disposing service resources');
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}
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_locationSub?.cancel();
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_alertsController.close();
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try {
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_tts.stop();
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} catch (_) {}
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}
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}
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