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siro_rider/lib/services/emergency_signal_service.dart

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