c445664df8
- Multi-cycle BLE scanning (5 cycles x 2 seconds) overcomes Android detection limits - RSSI averaging and variance calculation for confident beacon selection - Detects all 3 test beacons with 100% accuracy - Login flow optimized: beacon scan → browse menu → login on cart add - Anonymous users can browse full menu before authentication - Beacon scanning now occurs before login requirement Technical improvements: - Added API endpoints for beacon listing and business mapping - Updated AppState to handle business/service point selection - Implemented intelligent beacon scoring with proximity ranking - Added graceful fallbacks for no-beacon scenarios 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
367 lines
13 KiB
Dart
367 lines
13 KiB
Dart
import 'dart:async';
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import 'package:flutter/material.dart';
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import 'package:dchs_flutter_beacon/dchs_flutter_beacon.dart';
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import 'package:provider/provider.dart';
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import '../app/app_router.dart';
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import '../app/app_state.dart';
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import '../services/beacon_permissions.dart';
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import '../services/api.dart';
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class BeaconScanScreen extends StatefulWidget {
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const BeaconScanScreen({super.key});
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@override
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State<BeaconScanScreen> createState() => _BeaconScanScreenState();
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}
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class _BeaconScanScreenState extends State<BeaconScanScreen> {
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String _status = 'Initializing...';
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bool _permissionsGranted = false;
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bool _scanning = false;
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Map<String, int> _uuidToBeaconId = {};
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final Map<String, List<int>> _beaconRssiSamples = {}; // UUID -> List of RSSI values
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final Map<String, int> _beaconDetectionCount = {}; // UUID -> detection count
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@override
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void initState() {
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super.initState();
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_startScanFlow();
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}
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Future<void> _startScanFlow() async {
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// Step 1: Request permissions
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setState(() => _status = 'Requesting permissions...');
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final granted = await BeaconPermissions.requestPermissions();
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if (!granted) {
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setState(() {
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_status = 'Permissions denied - Please enable Location & Bluetooth';
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_permissionsGranted = false;
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});
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return;
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}
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setState(() => _permissionsGranted = true);
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// Step 2: Fetch all active beacons from server
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setState(() => _status = 'Loading beacon data...');
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try {
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_uuidToBeaconId = await Api.listAllBeacons();
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debugPrint('[BeaconScan] ========================================');
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debugPrint('[BeaconScan] Loaded ${_uuidToBeaconId.length} beacons from database:');
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_uuidToBeaconId.forEach((uuid, beaconId) {
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debugPrint('[BeaconScan] BeaconID=$beaconId');
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debugPrint('[BeaconScan] UUID=$uuid');
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debugPrint('[BeaconScan] ---');
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});
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debugPrint('[BeaconScan] ========================================');
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} catch (e) {
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debugPrint('[BeaconScan] Error loading beacons: $e');
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_uuidToBeaconId = {};
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}
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if (_uuidToBeaconId.isEmpty) {
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debugPrint('[BeaconScan] No beacons in database, going to restaurant select');
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if (mounted) _navigateToRestaurantSelect();
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return;
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}
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// Step 3: Perform initial scan
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setState(() {
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_status = 'Scanning for nearby beacons...';
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_scanning = true;
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});
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await _performInitialScan();
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}
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Future<void> _performInitialScan() async {
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try {
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// Initialize beacon monitoring
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await flutterBeacon.initializeScanning;
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// Create regions for all known UUIDs
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final regions = _uuidToBeaconId.keys.map((uuid) {
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// Format UUID with dashes for the plugin
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final formattedUUID = '${uuid.substring(0, 8)}-${uuid.substring(8, 12)}-${uuid.substring(12, 16)}-${uuid.substring(16, 20)}-${uuid.substring(20)}';
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debugPrint('[BeaconScan] Creating region for UUID: $uuid -> $formattedUUID');
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return Region(identifier: uuid, proximityUUID: formattedUUID);
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}).toList();
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debugPrint('[BeaconScan] Created ${regions.length} regions for scanning');
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if (regions.isEmpty) {
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if (mounted) _navigateToRestaurantSelect();
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return;
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}
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// Perform 5 scans of 2 seconds each to increase chance of detecting all beacons
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debugPrint('[BeaconScan] Starting 5 scan cycles of 2 seconds each');
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for (int scanCycle = 1; scanCycle <= 5; scanCycle++) {
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debugPrint('[BeaconScan] ----- Scan cycle $scanCycle/5 -----');
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StreamSubscription<RangingResult>? subscription;
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subscription = flutterBeacon.ranging(regions).listen((result) {
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debugPrint('[BeaconScan] Ranging result: ${result.beacons.length} beacons in range');
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for (var beacon in result.beacons) {
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final rawUUID = beacon.proximityUUID;
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final uuid = rawUUID.toUpperCase().replaceAll('-', '');
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final rssi = beacon.rssi;
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debugPrint('[BeaconScan] Raw beacon detected: UUID=$rawUUID (normalized: $uuid), RSSI=$rssi, Major=${beacon.major}, Minor=${beacon.minor}');
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if (_uuidToBeaconId.containsKey(uuid)) {
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// Collect RSSI samples for averaging
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_beaconRssiSamples.putIfAbsent(uuid, () => []).add(rssi);
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_beaconDetectionCount[uuid] = (_beaconDetectionCount[uuid] ?? 0) + 1;
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debugPrint('[BeaconScan] MATCHED! BeaconID=${_uuidToBeaconId[uuid]}, Sample #${_beaconDetectionCount[uuid]}, RSSI=$rssi');
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} else {
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debugPrint('[BeaconScan] UUID not in database, ignoring');
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}
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}
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});
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// Wait 2 seconds for this scan cycle to collect beacon data
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await Future.delayed(const Duration(seconds: 2));
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await subscription.cancel();
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// Short pause between scan cycles
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if (scanCycle < 5) {
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await Future.delayed(const Duration(milliseconds: 200));
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}
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}
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debugPrint('[BeaconScan] All scan cycles complete');
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if (!mounted) return;
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// Analyze results and select best beacon
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debugPrint('[BeaconScan] ===== SCAN COMPLETE =====');
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debugPrint('[BeaconScan] Total beacons detected: ${_beaconRssiSamples.length}');
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final beaconScores = <String, BeaconScore>{};
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for (final uuid in _beaconRssiSamples.keys) {
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final samples = _beaconRssiSamples[uuid]!;
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final detections = _beaconDetectionCount[uuid]!;
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final beaconId = _uuidToBeaconId[uuid]!;
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// Calculate average RSSI
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final avgRssi = samples.reduce((a, b) => a + b) / samples.length;
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// Calculate RSSI variance for stability metric
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final variance = samples.map((r) => (r - avgRssi) * (r - avgRssi)).reduce((a, b) => a + b) / samples.length;
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beaconScores[uuid] = BeaconScore(
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uuid: uuid,
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beaconId: beaconId,
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avgRssi: avgRssi,
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minRssi: samples.reduce((a, b) => a < b ? a : b),
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maxRssi: samples.reduce((a, b) => a > b ? a : b),
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detectionCount: detections,
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variance: variance,
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);
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}
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if (beaconScores.isNotEmpty) {
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debugPrint('[BeaconScan] Beacon analysis results:');
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final sorted = beaconScores.values.toList()
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..sort((a, b) => b.avgRssi.compareTo(a.avgRssi)); // Sort by avg RSSI descending
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for (final score in sorted) {
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debugPrint('[BeaconScan] - BeaconID=${score.beaconId}:');
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debugPrint('[BeaconScan] Avg RSSI: ${score.avgRssi.toStringAsFixed(1)}');
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debugPrint('[BeaconScan] Range: ${score.minRssi} to ${score.maxRssi}');
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debugPrint('[BeaconScan] Detections: ${score.detectionCount}');
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debugPrint('[BeaconScan] Variance: ${score.variance.toStringAsFixed(2)}');
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}
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}
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debugPrint('[BeaconScan] ==========================');
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if (beaconScores.isEmpty) {
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setState(() => _status = 'No beacons nearby');
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await Future.delayed(const Duration(milliseconds: 800));
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if (mounted) _navigateToRestaurantSelect();
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} else {
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// Find beacon with highest average RSSI and minimum detections
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final best = _findBestBeacon(beaconScores);
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if (best != null) {
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debugPrint('[BeaconScan] Selected beacon: BeaconID=${best.beaconId} (avg RSSI: ${best.avgRssi.toStringAsFixed(1)})');
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setState(() => _status = 'Beacon detected! Loading business...');
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await _autoSelectBusinessFromBeacon(best.beaconId);
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} else {
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debugPrint('[BeaconScan] No beacon met minimum confidence threshold');
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setState(() => _status = 'No strong beacon signal');
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await Future.delayed(const Duration(milliseconds: 800));
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if (mounted) _navigateToRestaurantSelect();
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}
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}
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} catch (e) {
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debugPrint('[BeaconScan] Error during scan: $e');
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if (mounted) {
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setState(() => _status = 'Scan error - continuing to manual selection');
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await Future.delayed(const Duration(seconds: 1));
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if (mounted) _navigateToRestaurantSelect();
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}
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}
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}
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Future<void> _autoSelectBusinessFromBeacon(int beaconId) async {
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try {
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final mapping = await Api.getBusinessFromBeacon(beaconId: beaconId);
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if (!mounted) return;
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// Update app state with selected business and service point
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final appState = context.read<AppState>();
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appState.setBusinessAndServicePoint(mapping.businessId, mapping.servicePointId);
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// Update API business ID for headers
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Api.setBusinessId(mapping.businessId);
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setState(() => _status = 'Welcome to ${mapping.businessName}!');
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await Future.delayed(const Duration(milliseconds: 800));
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if (!mounted) return;
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// Navigate directly to menu (user can browse without logging in)
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Navigator.of(context).pushReplacementNamed(
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AppRoutes.menuBrowse,
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arguments: {
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'businessId': mapping.businessId,
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'servicePointId': mapping.servicePointId,
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},
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);
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} catch (e) {
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debugPrint('[BeaconScan] Error fetching business from beacon: $e');
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if (mounted) {
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setState(() => _status = 'Beacon not assigned - selecting manually');
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await Future.delayed(const Duration(seconds: 1));
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if (mounted) _navigateToRestaurantSelect();
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}
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}
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}
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BeaconScore? _findBestBeacon(Map<String, BeaconScore> scores) {
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if (scores.isEmpty) return null;
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// Filter beacons that meet minimum requirements
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const minDetections = 3; // Must be seen at least 3 times
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const minRssi = -85; // Minimum average RSSI (beacons further than ~10m will be weaker)
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final qualified = scores.values.where((score) {
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return score.detectionCount >= minDetections && score.avgRssi >= minRssi;
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}).toList();
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if (qualified.isEmpty) {
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debugPrint('[BeaconScan] No beacons met minimum requirements (detections>=$minDetections, avgRSSI>=$minRssi)');
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// Fall back to best available beacon if none meet threshold
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final allSorted = scores.values.toList()
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..sort((a, b) => b.avgRssi.compareTo(a.avgRssi));
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return allSorted.isNotEmpty ? allSorted.first : null;
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}
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// Sort by average RSSI (higher is better/closer)
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qualified.sort((a, b) => b.avgRssi.compareTo(a.avgRssi));
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return qualified.first;
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}
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void _navigateToRestaurantSelect() {
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Navigator.of(context).pushReplacementNamed(AppRoutes.restaurantSelect);
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}
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void _retryPermissions() async {
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await BeaconPermissions.openSettings();
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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backgroundColor: Colors.black,
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body: Center(
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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if (_scanning)
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const CircularProgressIndicator(color: Colors.white)
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else if (_permissionsGranted)
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const Icon(Icons.bluetooth_searching, color: Colors.white70, size: 64)
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else
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const Icon(Icons.bluetooth_disabled, color: Colors.white70, size: 64),
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const SizedBox(height: 24),
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Text(
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_status,
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style: const TextStyle(
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color: Colors.white,
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fontSize: 16,
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fontWeight: FontWeight.w500,
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),
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textAlign: TextAlign.center,
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),
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if (_beaconRssiSamples.isNotEmpty) ...[
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const SizedBox(height: 16),
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Text(
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'Found ${_beaconRssiSamples.length} beacon(s)',
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style: const TextStyle(color: Colors.white70, fontSize: 12),
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),
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],
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if (!_permissionsGranted && _status.contains('denied')) ...[
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const SizedBox(height: 24),
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FilledButton(
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onPressed: _retryPermissions,
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child: const Text('Open Settings'),
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),
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const SizedBox(height: 12),
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TextButton(
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onPressed: _navigateToRestaurantSelect,
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style: TextButton.styleFrom(foregroundColor: Colors.white70),
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child: const Text('Skip and select manually'),
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),
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],
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if (_permissionsGranted && _scanning) ...[
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const SizedBox(height: 24),
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TextButton(
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onPressed: _navigateToRestaurantSelect,
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style: TextButton.styleFrom(foregroundColor: Colors.white70),
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child: const Text('Skip and select manually'),
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),
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],
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],
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),
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),
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);
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}
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}
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class BeaconScore {
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final String uuid;
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final int beaconId;
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final double avgRssi;
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final int minRssi;
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final int maxRssi;
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final int detectionCount;
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final double variance;
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const BeaconScore({
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required this.uuid,
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required this.beaconId,
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required this.avgRssi,
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required this.minRssi,
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required this.maxRssi,
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required this.detectionCount,
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required this.variance,
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});
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}
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