Flutter App

flutter_app/lib/providers/price_provider.dart

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+import 'dart:async';
+import 'package:flutter/foundation.dart';
+import '../models/price_data.dart';
+import '../services/websocket_service.dart';
+import '../services/api_service.dart';
+import '../services/storage_service.dart';
+import '../services/notification_service.dart';
+
+class PriceProvider with ChangeNotifier {
+  final WebSocketService _wsService = WebSocketService();
+  final ApiService _apiService = ApiService();
+  final StorageService _storageService = StorageService();
+  final NotificationService _notificationService = NotificationService();
+
+  LatestPrice? _latestPrice;
+  HistoryData? _historyData;
+  String _connectionStatus = 'Disconnected';
+  List<PriceAlert> _alerts = [];
+  double? _customAuecAmount;
+  String _selectedRange = '7d';
+  bool _isLoading = false;
+  bool _isHistoryLoading = false;
+
+  LatestPrice? get latestPrice => _latestPrice;
+  HistoryData? get historyData => _historyData;
+  String get connectionStatus => _connectionStatus;
+  List<PriceAlert> get alerts => _alerts;
+  double? get customAuecAmount => _customAuecAmount;
+  String get selectedRange => _selectedRange;
+  bool get isLoading => _isLoading;
+  bool get isHistoryLoading => _isHistoryLoading;
+
+  PriceProvider() {
+    _initialize();
+  }
+
+  Timer? _pollTimer;
+
+  void _initialize() {
+    // Load saved data
+    _loadAlerts();
+    _loadCustomAuecAmount();
+
+    // Connect WebSocket (currently disabled)
+    _wsService.connect();
+
+    // Listen to WebSocket streams
+    _wsService.latestPriceStream.listen((price) {
+      _latestPrice = price;
+      _checkAlerts(price);
+      notifyListeners();
+    });
+
+    _wsService.connectionStatusStream.listen((status) {
+      _connectionStatus = status;
+      notifyListeners();
+    });
+
+    // Fetch initial data
+    fetchInitialData();
+    
+    // Start polling for updates every 5 minutes as backup to WebSocket
+    _startPolling();
+  }
+
+  void _startPolling() {
+    _pollTimer = Timer.periodic(const Duration(minutes: 5), (timer) {
+      fetchInitialData();
+    });
+  }
+
+  Future<void> fetchInitialData() async {
+    final latest = await _apiService.fetchLatestPrice();
+    if (latest != null) {
+      _latestPrice = latest;
+      notifyListeners();
+    }
+    await fetchHistory(_selectedRange);
+  }
+
+  Future<void> fetchHistory(String range) async {
+    _isHistoryLoading = true;
+    _selectedRange = range;
+    notifyListeners();
+    
+    try {
+      final history = await _apiService.fetchHistory(range);
+      if (history != null) {
+        _historyData = history;
+      }
+      _wsService.requestHistory(range);
+    } catch (e) {
+      if (kDebugMode) {
+        print('Error fetching history: $e');
+      }
+    } finally {
+      _isHistoryLoading = false;
+      notifyListeners();
+    }
+  }
+
+  Future<void> _loadAlerts() async {
+    _alerts = await _storageService.getAlerts();
+    notifyListeners();
+  }
+
+  Future<void> _loadCustomAuecAmount() async {
+    _customAuecAmount = await _storageService.getCustomAuecAmount();
+    notifyListeners();
+  }
+
+  Future<void> addAlert(double auecAmount, double maxPrice) async {
+    final alert = PriceAlert(
+      id: DateTime.now().millisecondsSinceEpoch.toString(),
+      auecAmount: auecAmount,
+      maxPrice: maxPrice,
+      enabled: true,
+    );
+    await _storageService.addAlert(alert);
+    await _loadAlerts();
+  }
+
+  Future<void> toggleAlert(String id) async {
+    final alert = _alerts.firstWhere((a) => a.id == id);
+    final updated = alert.copyWith(enabled: !alert.enabled);
+    await _storageService.updateAlert(updated);
+    await _loadAlerts();
+  }
+
+  Future<void> deleteAlert(String id) async {
+    await _storageService.deleteAlert(id);
+    await _loadAlerts();
+  }
+
+  Future<void> setCustomAuecAmount(double amount) async {
+    await _storageService.setCustomAuecAmount(amount);
+    _customAuecAmount = amount;
+    notifyListeners();
+  }
+
+  void _checkAlerts(LatestPrice price) {
+    for (final alert in _alerts) {
+      if (!alert.enabled) continue;
+
+      final matchingSeller = price.allPrices.firstWhere(
+        (p) {
+          final totalPrice = (alert.auecAmount / 1000000) * p.pricePerMillion;
+          return totalPrice <= alert.maxPrice;
+        },
+        orElse: () => price.allPrices.first,
+      );
+
+      final totalPrice = (alert.auecAmount / 1000000) * matchingSeller.pricePerMillion;
+      if (totalPrice <= alert.maxPrice) {
+        // Trigger notification
+        _notificationService.showPriceAlert(
+          title: 'Price Alert Triggered!',
+          body: '${(alert.auecAmount / 1000000000).toStringAsFixed(1)}B AUEC available for \$${totalPrice.toStringAsFixed(2)} from ${matchingSeller.sellerName}',
+          auecAmount: alert.auecAmount,
+          price: totalPrice,
+          seller: matchingSeller.sellerName,
+        );
+        
+        // Disable alert
+        toggleAlert(alert.id);
+      }
+    }
+  }
+
+  @override
+  void dispose() {
+    _pollTimer?.cancel();
+    _wsService.dispose();
+    super.dispose();
+  }
+}