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Implement one-tap SOS emergency button for guards #368

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243 changes: 103 additions & 140 deletions guard_app/src/components/FloatingSOSButton.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -2,189 +2,152 @@
import { Ionicons } from '@expo/vector-icons';
import { useNavigation } from '@react-navigation/native';
import { NativeStackNavigationProp } from '@react-navigation/native-stack';
import React, { useCallback, useEffect, useRef, useState } from 'react';
import { Animated, Easing, Pressable, StyleSheet, Text, View, Vibration } from 'react-native';
import React, { useCallback, useRef, useState } from 'react';
import { Animated, Easing, Pressable, StyleSheet, Text, View } from 'react-native';
import SOSConfirmSheet from './sos/SOSConfirmSheet';

import type { RootStackParamList } from '../navigation/AppNavigator';

const HOLD_DURATION_MS = 2000;
const SIZE = 64;

type Nav = NativeStackNavigationProp<RootStackParamList>;

type Props = {
/** Optional override for hold-to-trigger duration */
holdDurationMs?: number;
/** Optional bottom offset (e.g. to clear a tab bar) */
bottomOffset?: number;
/** Optional right offset */
rightOffset?: number;
};

export default function FloatingSOSButton({
holdDurationMs = HOLD_DURATION_MS,
bottomOffset = 90,
rightOffset = 20,
}: Props) {
export default function FloatingSOSButton({ bottomOffset = 90, rightOffset = 20 }: Props) {
const navigation = useNavigation<Nav>();

const [holding, setHolding] = useState(false);

// Animated values are created lazily once and remain stable across renders.
// Using useState (rather than useRef + .current) keeps the new
// react-hooks/refs lint rule happy.
const [progress] = useState(() => new Animated.Value(0));
const [scale] = useState(() => new Animated.Value(1));
const triggeredRef = useRef(false);

const reset = useCallback(() => {
progress.stopAnimation();
scale.stopAnimation();
Animated.parallel([
Animated.timing(progress, {
toValue: 0,
duration: 200,
easing: Easing.out(Easing.quad),
useNativeDriver: false,
}),
Animated.spring(scale, {
toValue: 1,
useNativeDriver: false,
}),
]).start();
setHolding(false);
triggeredRef.current = false;
}, [progress, scale]);

const startHold = useCallback(() => {
triggeredRef.current = false;
setHolding(true);

Animated.spring(scale, {
toValue: 1.1,
useNativeDriver: false,
}).start();

Animated.timing(progress, {
toValue: 1,
duration: holdDurationMs,
easing: Easing.linear,
useNativeDriver: false,
}).start(({ finished }) => {
if (finished && !triggeredRef.current) {
triggeredRef.current = true;
Vibration.vibrate(200);
reset();
navigation.navigate('ActiveSOS');
}
});
}, [holdDurationMs, navigation, progress, reset, scale]);

const cancelHold = useCallback(() => {
if (triggeredRef.current) return;
reset();
}, [reset]);

// Cleanup if the component unmounts mid-hold
useEffect(() => {
return () => {
progress.stopAnimation();
scale.stopAnimation();
};
}, [progress, scale]);

const ringRotation = progress.interpolate({
inputRange: [0, 1],
outputRange: ['0deg', '360deg'],
});

const ringOpacity = progress.interpolate({
inputRange: [0, 0.05, 1],
outputRange: [0, 1, 1],
});
const [sheetVisible, setSheetVisible] = useState(false);

// Subtle pulse animation on the FAB to draw attention
const [pulseScale] = useState(() => new Animated.Value(1));
const [pulseOpacity] = useState(() => new Animated.Value(0));
const pulseAnim = useRef<Animated.CompositeAnimation | null>(null);

const startPulse = useCallback(() => {
pulseAnim.current?.stop();
pulseScale.setValue(1);
pulseOpacity.setValue(0.6);
pulseAnim.current = Animated.loop(
Animated.parallel([
Animated.timing(pulseScale, {
toValue: 1.55,
duration: 1200,
easing: Easing.out(Easing.quad),
useNativeDriver: true,
}),
Animated.timing(pulseOpacity, {
toValue: 0,
duration: 1200,
easing: Easing.out(Easing.quad),
useNativeDriver: true,
}),
]),
);
pulseAnim.current.start();
}, [pulseScale, pulseOpacity]);

const stopPulse = useCallback(() => {
pulseAnim.current?.stop();
pulseScale.setValue(1);
pulseOpacity.setValue(0);
}, [pulseScale, pulseOpacity]);

const handlePress = useCallback(() => {
startPulse();
setSheetVisible(true);
}, [startPulse]);

const handleDismiss = useCallback(() => {
stopPulse();
setSheetVisible(false);
}, [stopPulse]);

const handleConfirm = useCallback(() => {
stopPulse();
setSheetVisible(false);
// Navigate immediately – speed is critical in an emergency
navigation.navigate('ActiveSOS');
}, [navigation, stopPulse]);

return (
<View
style={[styles.wrapper, { bottom: bottomOffset, right: rightOffset }]}
pointerEvents="box-none"
>
{holding ? <Text style={styles.hint}>Hold to send SOS</Text> : null}
<Animated.View style={{ transform: [{ scale }] }}>
<>
{/* Floating SOS button */}
<View
style={[styles.wrapper, { bottom: bottomOffset, right: rightOffset }]}
pointerEvents="box-none"
>
{/* Pulse ring (visible while sheet is open) */}
<Animated.View
pointerEvents="none"
style={[
styles.pulseRing,
{
transform: [{ scale: pulseScale }],
opacity: pulseOpacity,
},
]}
/>

<Pressable
accessibilityLabel="Trigger SOS"
accessibilityHint="Press and hold for 2 seconds to send an emergency SOS"
onPressIn={startHold}
onPressOut={cancelHold}
style={({ pressed }) => [styles.button, pressed ? styles.buttonPressed : null]}
accessibilityHint="Tap to open emergency SOS confirmation"
accessibilityRole="button"
onPress={handlePress}
style={({ pressed }) => [styles.button, pressed && styles.buttonPressed]}
>
<Animated.View
pointerEvents="none"
style={[
styles.ring,
{
opacity: ringOpacity,
transform: [{ rotate: ringRotation }],
},
]}
/>
<Ionicons name="warning" size={26} color="#C62034" />
<Ionicons name="warning" size={26} color="#FFFFFF" />
<Text style={styles.label}>SOS</Text>
</Pressable>
</Animated.View>
</View>
</View>

{/* Confirmation sheet */}
<SOSConfirmSheet visible={sheetVisible} onConfirm={handleConfirm} onDismiss={handleDismiss} />
</>
);
}

const styles = StyleSheet.create({
wrapper: {
position: 'absolute',
alignItems: 'flex-end',
alignItems: 'center',
justifyContent: 'center',
zIndex: 1000,
elevation: 12,
},
hint: {
backgroundColor: 'rgba(0,0,0,0.75)',
color: '#FFFFFF',
fontSize: 12,
fontWeight: '600',
paddingHorizontal: 10,
paddingVertical: 4,
borderRadius: 12,
marginBottom: 6,
overflow: 'hidden',
pulseRing: {
position: 'absolute',
width: SIZE,
height: SIZE,
borderRadius: SIZE / 2,
backgroundColor: 'rgba(198,32,52,0.45)',
},
button: {
width: SIZE,
height: SIZE,
borderRadius: SIZE / 2,
backgroundColor: 'rgba(255, 255, 255, 0.85)',
backgroundColor: '#C62034',
alignItems: 'center',
justifyContent: 'center',
shadowColor: '#000',
shadowOpacity: 0.12,
shadowRadius: 6,
shadowOffset: { width: 0, height: 3 },
elevation: 5,
borderWidth: 2,
borderColor: 'rgba(198, 32, 52, 0.85)',
shadowColor: '#C62034',
shadowOpacity: 0.55,
shadowRadius: 10,
shadowOffset: { width: 0, height: 4 },
elevation: 8,
gap: 2,
},
buttonPressed: {
backgroundColor: 'rgba(198, 32, 52, 0.92)',
},
ring: {
position: 'absolute',
width: SIZE + 12,
height: SIZE + 12,
borderRadius: (SIZE + 12) / 2,
borderWidth: 3,
borderColor: '#C62034',
borderTopColor: 'transparent',
backgroundColor: '#9B0018',
shadowOpacity: 0.3,
},
label: {
color: '#C62034',
color: '#FFFFFF',
fontWeight: '900',
fontSize: 11,
letterSpacing: 1,
marginTop: 2,
letterSpacing: 1.5,
},
});
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