mercury/mercury_frontend/lib/sensor_provider.dart

import 'dart:async';

import 'package:flutter/material.dart';
import 'sensor_data.dart';
import 'sensor_service.dart';

class SensorProvider with ChangeNotifier {
  final SensorService _service = SensorService();
  SensorData? _sensorData;

  Exception? _exception;

  SensorData? get sensorData => _sensorData;

  Exception? get exception => _exception;

  Timer? _timer;

  Future<void> fetchData() async {
    try {
      _sensorData = await _service.fetchSensorData();
    } on Exception catch (e) {
      _exception = e;
      _sensorData = null;
    }
    notifyListeners();
  }
  
  void startAutoFetch(Duration interval) {
    _timer = Timer.periodic(interval, (timer) async {
      await fetchData();
    });
  }

  // Stop auto-fetching
  void stopAutoFetch() {
    _timer?.cancel();
    _timer = null;
  }

  // Dispose the timer when the provider is disposed
  @override
  void dispose() {
    _timer?.cancel();
    super.dispose();
  }
}