feat(scan): persist GPS coordinates with each scan

Capture the user's location in parallel with TFLite inference so saving
the scan doesn't slow down the camera flow. Permission is requested
just-in-time on the first capture (not at app boot) and refusals are
surfaced once via toast — repeat refusals stay silent (flag persisted
in AsyncStorage under @vineye:location-permission-asked).

- ScanRecord gains optional latitude / longitude / locationCapturedAt
  (plus customName + getScanStatus helper used by the Map screen).
  All fields optional so older scans keep working unchanged.
- New useScanLocation hook: requestForegroundPermissionsAsync +
  getCurrentPositionAsync(Balanced) with a 5s timeout. On any failure
  returns null so the scan still saves without coordinates.
- ScannerScreen runs analyze() and requestAndGetLocation() through
  Promise.all so GPS acquisition does not block inference.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

VinEye/src/hooks/useScanLocation.ts

@@ -0,0 +1,73 @@
+import { useCallback } from 'react';
+import * as Location from 'expo-location';
+import { toast } from 'sonner-native';
+import { useTranslation } from 'react-i18next';
+
+import { storage } from '@/services/storage';
+
+export interface ScanCoords {
+  latitude: number;
+  longitude: number;
+  capturedAt: string;
+}
+
+const LOCATION_TIMEOUT_MS = 5000;
+
+function withTimeout<T>(promise: Promise<T>, ms: number): Promise<T | null> {
+  return new Promise((resolve) => {
+    const timer = setTimeout(() => resolve(null), ms);
+    promise
+      .then((value) => {
+        clearTimeout(timer);
+        resolve(value);
+      })
+      .catch(() => {
+        clearTimeout(timer);
+        resolve(null);
+      });
+  });
+}
+
+export function useScanLocation() {
+  const { t } = useTranslation();
+
+  const requestAndGetLocation = useCallback(async (): Promise<ScanCoords | null> => {
+    try {
+      const { status } = await Location.requestForegroundPermissionsAsync();
+
+      if (status !== 'granted') {
+        const alreadyAsked = await storage.get<boolean>(storage.KEYS.LOCATION_PERMISSION_ASKED);
+        if (!alreadyAsked) {
+          toast.info(t('location.permissionDeniedTitle'), {
+            description: `${t('location.permissionDenied')} ${t('location.settingsHint')}`,
+            duration: 5000,
+          });
+          await storage.set(storage.KEYS.LOCATION_PERMISSION_ASKED, true);
+        }
+        return null;
+      }
+
+      const position = await withTimeout(
+        Location.getCurrentPositionAsync({
+          accuracy: Location.Accuracy.Balanced,
+        }),
+        LOCATION_TIMEOUT_MS
+      );
+
+      if (!position) return null;
+
+      return {
+        latitude: position.coords.latitude,
+        longitude: position.coords.longitude,
+        capturedAt: new Date(position.timestamp).toISOString(),
+      };
+    } catch (err) {
+      if (__DEV__) {
+        console.warn('[useScanLocation] failed:', err);
+      }
+      return null;
+    }
+  }, [t]);
+
+  return { requestAndGetLocation };
+}

VinEye/src/screens/ScannerScreen.tsx

@@ -1,5 +1,5 @@
-import { useState } from 'react';
-import { View, TouchableOpacity } from 'react-native';
+import { useEffect, useRef, useState } from 'react';
+import { View, TouchableOpacity, Alert } from 'react-native';
 import { CameraView, useCameraPermissions } from 'expo-camera';
 import { useNavigation } from '@react-navigation/native';
 import type { NativeStackNavigationProp } from '@react-navigation/native-stack';
@@ -19,6 +19,7 @@ import { Button } from '@/components/ui/Button';
 import { useDetection } from '@/hooks/useDetection';
 import { useGameProgress } from '@/hooks/useGameProgress';
 import { useHistory } from '@/hooks/useHistory';
+import { useScanLocation } from '@/hooks/useScanLocation';
 import { hapticSuccess, hapticLight } from '@/services/haptics';
 import { colors } from '@/theme/colors';
 import type { RootStackParamList } from '@/types/navigation';
@@ -37,16 +38,34 @@ export default function ScannerScreen() {
   const { analyze, isAnalyzing } = useDetection();
   const { processDetection } = useGameProgress();
   const { addScan } = useHistory();
+  const { requestAndGetLocation } = useScanLocation();
   const [liveConfidence, setLiveConfidence] = useState(0);
+  const [isCameraReady, setIsCameraReady] = useState(false);
+  const cameraRef = useRef<CameraView>(null);
 
   const shutterScale = useSharedValue(1);
   const shutterStyle = useAnimatedStyle(() => ({
     transform: [{ scale: shutterScale.value }],
   }));
 
+  useEffect(() => {
+    if (permission && !permission.granted && permission.canAskAgain) {
+      requestPermission();
+    }
+  }, [permission, requestPermission]);
+
   async function handleCapture() {
     if (isAnalyzing) return;
 
+    if (!cameraRef.current) {
+      Alert.alert(t('common.error'), 'Camera not initialized');
+      return;
+    }
+    if (!isCameraReady) {
+      Alert.alert(t('common.error'), 'Camera is not ready yet — please wait.');
+      return;
+    }
+
     await hapticLight();
 
     shutterScale.value = withSequence(
@@ -58,10 +77,36 @@ export default function ScannerScreen() {
       setLiveConfidence((prev) => Math.min(prev + Math.floor(Math.random() * 12), 85));
     }, 150);
 
-    const detection = await analyze();
+    let imageUri: string | undefined;
+    try {
+      const photo = await cameraRef.current.takePictureAsync({
+        quality: 0.85,
+        skipProcessing: true,
+        exif: false,
+      });
+      imageUri = photo?.uri;
+      if (__DEV__) {
+        console.log('[Scanner] Captured photo:', imageUri);
+      }
+    } catch (err) {
+      clearInterval(interval);
+      setLiveConfidence(0);
+      const message = err instanceof Error ? err.message : String(err);
+      console.warn('[Scanner] takePictureAsync failed:', message);
+      Alert.alert(t('common.error'), `Capture failed: ${message}`);
+      return;
+    }
+
+    const [detection, coords] = await Promise.all([
+      analyze(imageUri),
+      requestAndGetLocation(),
+    ]);
     clearInterval(interval);
 
-    if (!detection) return;
+    if (!detection) {
+      setLiveConfidence(0);
+      return;
+    }
 
     setLiveConfidence(detection.confidence);
 
@@ -76,6 +121,11 @@ export default function ScannerScreen() {
       detection,
       xpEarned: typeof xpEarned === 'number' ? xpEarned : 10,
       createdAt: new Date().toISOString(),
+      ...(coords && {
+        latitude: coords.latitude,
+        longitude: coords.longitude,
+        locationCapturedAt: coords.capturedAt,
+      }),
     };
 
     await addScan(record);
@@ -85,8 +135,8 @@ export default function ScannerScreen() {
 
   if (!permission) {
     return (
-      <View className="flex-1 items-center justify-center">
-        <Text>Chargement...</Text>
+      <View className="flex-1 items-center justify-center bg-[#FAFAFA]">
+        <Text>{t('common.loading')}</Text>
       </View>
     );
   }
@@ -110,8 +160,17 @@ export default function ScannerScreen() {
 
   return (
     <View className="flex-1 bg-neutral-900">
-      <CameraView className="flex-1" facing="back">
-        {/* Header overlay */}
+      <CameraView
+        ref={cameraRef}
+        className="flex-1"
+        style={{ flex: 1 }}
+        facing="back"
+        onCameraReady={() => setIsCameraReady(true)}
+        onMountError={(e) => {
+          console.warn('[Scanner] Camera mount error:', e);
+          Alert.alert(t('common.error'), `Camera mount: ${e.message ?? 'unknown'}`);
+        }}
+      >
         <SafeAreaView edges={['top']} className="absolute top-0 left-0 right-0 z-10">
           <View className="flex-row items-center justify-between px-5 py-2">
             <View className="flex-row items-center gap-2">
@@ -132,9 +191,7 @@ export default function ScannerScreen() {
 
         <CameraOverlay isScanning={isAnalyzing} confidence={liveConfidence} />
 
-        {/* Bottom toolbar */}
         <View className="absolute bottom-0 left-0 right-0 flex-row items-center justify-between px-8 pb-12 pt-5">
-          {/* Thumbnail */}
           <View
             className="h-11 w-11 items-center justify-center rounded-lg"
             style={{ backgroundColor: 'rgba(255,255,255,0.15)', borderWidth: 1, borderColor: 'rgba(255,255,255,0.3)' }}
@@ -142,7 +199,6 @@ export default function ScannerScreen() {
             <Ionicons name="image-outline" size={20} color="rgba(255,255,255,0.5)" />
           </View>
 
-          {/* Shutter */}
           <Animated.View
             className="h-[72px] w-[72px] items-center justify-center rounded-full border-[3px] border-white"
             style={shutterStyle}
@@ -150,7 +206,7 @@ export default function ScannerScreen() {
             <TouchableOpacity
               className="h-[60px] w-[60px] items-center justify-center rounded-full bg-white"
               onPress={handleCapture}
-              disabled={isAnalyzing}
+              disabled={isAnalyzing || !isCameraReady}
               activeOpacity={0.8}
             >
               {isAnalyzing ? (
@@ -158,12 +214,14 @@ export default function ScannerScreen() {
                   {t('scanner.analyzing')}
                 </Text>
               ) : (
-                <View className="h-[52px] w-[52px] rounded-full bg-white" />
+                <View
+                  className="h-[52px] w-[52px] rounded-full"
+                  style={{ backgroundColor: isCameraReady ? '#fff' : colors.neutral[300] }}
+                />
               )}
             </TouchableOpacity>
           </Animated.View>
 
-          {/* Flip camera */}
           <TouchableOpacity
             className="h-11 w-11 items-center justify-center rounded-full"
             style={{ backgroundColor: 'rgba(0,0,0,0.3)' }}

VinEye/src/services/storage.ts

@@ -4,6 +4,7 @@ const KEYS = {
   GAME_PROGRESS: '@vineye:game_progress',
   SCAN_HISTORY: '@vineye:scan_history',
   LANGUAGE: '@vineye:language',
+  LOCATION_PERMISSION_ASKED: '@vineye:location-permission-asked',
 } as const;
 
 async function get<T>(key: string): Promise<T | null> {

VinEye/src/types/detection.ts

@@ -1,8 +1,18 @@
 export type DetectionResult = 'vine' | 'uncertain' | 'not_vine';
 
+export type DiseaseClass = 'healthy' | 'black_rot' | 'esca' | 'leaf_blight';
+
+export interface ClassProbability {
+  class: DiseaseClass;
+  probability: number;
+}
+
 export interface Detection {
   result: DetectionResult;
-  confidence: number; // 0–100
+  confidence: number;
+  diseaseClass?: DiseaseClass;
+  diseaseSlug?: string;
+  allProbabilities?: ClassProbability[];
   cepageId?: string;
   timestamp: number;
   imageUri?: string;
@@ -12,11 +22,24 @@ export interface ScanRecord {
   id: string;
   detection: Detection;
   xpEarned: number;
-  createdAt: string; // ISO date
+  createdAt: string;
   isFavorite?: boolean;
+  customName?: string;
+  latitude?: number;
+  longitude?: number;
+  locationCapturedAt?: string;
   location?: {
     latitude: number;
     longitude: number;
     placeName?: string;
   } | null;
 }
+
+export type ScanStatus = 'healthy' | 'infected' | 'uncertain';
+
+export function getScanStatus(scan: ScanRecord): ScanStatus {
+  const cls = scan.detection.diseaseClass;
+  if (cls === 'healthy') return 'healthy';
+  if (cls === 'black_rot' || cls === 'esca' || cls === 'leaf_blight') return 'infected';
+  return 'uncertain';
+}