82 lines
2.2 KiB
Dart
82 lines
2.2 KiB
Dart
import 'dart:async';
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import 'dart:math';
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import 'package:flutter/foundation.dart';
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import 'package:sensors_plus/sensors_plus.dart';
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import '../print.dart';
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class EmergencySignalService {
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static final EmergencySignalService instance = EmergencySignalService._();
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EmergencySignalService._();
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StreamSubscription<AccelerometerEvent>? _accelerometerSubscription;
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DateTime? _lastShakeTime;
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int _shakeCount = 0;
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// Custom thresholds for shaking (force required)
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final double _shakeThresholdGravity = 2.7;
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final int _shakeSlopTimeMs = 500;
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final int _shakeCountResetTimeMs = 3000;
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final int _targetShakes = 5;
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VoidCallback? _onEmergencyTriggered;
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/// Starts listening to phone movement
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void startListening(VoidCallback onEmergencyTriggered) {
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_onEmergencyTriggered = onEmergencyTriggered;
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if (_accelerometerSubscription != null) return;
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_accelerometerSubscription = accelerometerEvents.listen((event) {
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double x = event.x;
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double y = event.y;
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double z = event.z;
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// Calculate the gForce using pythagorean theorem
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double gX = x / 9.80665;
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double gY = y / 9.80665;
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double gZ = z / 9.80665;
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// Overall gForce
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double gForce = sqrt(gX * gX + gY * gY + gZ * gZ);
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if (gForce > _shakeThresholdGravity) {
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final now = DateTime.now();
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// Ignore shakes that are too close to each other
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if (_lastShakeTime != null &&
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now.difference(_lastShakeTime!).inMilliseconds < _shakeSlopTimeMs) {
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return;
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}
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// Reset the counter if elapsed more than the reset window
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if (_lastShakeTime != null &&
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now.difference(_lastShakeTime!).inMilliseconds >
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_shakeCountResetTimeMs) {
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_shakeCount = 0;
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}
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_lastShakeTime = now;
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_shakeCount++;
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if (kDebugMode) {
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Log.print("🚨 Shake detected! Count: $_shakeCount");
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}
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if (_shakeCount >= _targetShakes) {
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_shakeCount = 0; // Reset counter
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if (_onEmergencyTriggered != null) {
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_onEmergencyTriggered!();
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}
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}
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}
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});
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}
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void stopListening() {
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_accelerometerSubscription?.cancel();
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_accelerometerSubscription = null;
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_shakeCount = 0;
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}
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}
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