Modify folder structure

mobile/traque-app/src/services/backgroundLocationTask.js

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+// Expo
+import { defineTask, isTaskRegisteredAsync } from "expo-task-manager";
+import * as Location from 'expo-location';
+// Services
+import { emitUpdatePosition } from "./socketEmitter";
+// Constants
+import { TASKS, LOCATION_PARAMETERS } from "../constants";
+
+
+// Task
+    
+defineTask(TASKS.BACKGROUND_LOCATION, async ({ data, error }) => {
+    if (error) {
+        console.error(error);
+        return;
+    }
+    if (data) {
+        const { locations } = data;
+        if (locations.length == 0) {
+            console.log("No location measured.");
+            return;
+        }
+        const { latitude, longitude } = locations[0].coords;
+        emitUpdatePosition([latitude, longitude]);
+    }
+});
+
+
+// Functions
+
+export const getLocationAuthorization = async () => {
+    const { status : statusForeground } = await Location.requestForegroundPermissionsAsync();
+    const { status : statusBackground } = await Location.requestBackgroundPermissionsAsync();
+    return statusForeground == "granted" && statusBackground == "granted";
+};
+
+export const startLocationTracking = async () => {
+    if (!(await getLocationAuthorization())) return;
+    if (await isTaskRegisteredAsync(TASKS.BACKGROUND_LOCATION)) return;
+    console.log("Location tracking started.");
+    await Location.startLocationUpdatesAsync(TASKS.BACKGROUND_LOCATION, LOCATION_PARAMETERS.SERVER);
+};
+
+export const stopLocationTracking = async () => {
+    if (!await isTaskRegisteredAsync(TASKS.BACKGROUND_LOCATION)) return;
+    console.log("Location tracking stopped.");
+    await Location.stopLocationUpdatesAsync(TASKS.BACKGROUND_LOCATION);
+};

mobile/traque-app/src/services/imageService.js

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+// Constants
+import { SERVER_URL } from "../constants";
+
+export const uploadTeamImage = async (id, imageUri) => {
+    if (!imageUri || !id) return;
+
+    const data = new FormData();
+    data.append('file', {
+        uri: imageUri,
+        name: 'photo.jpg',
+        type: 'image/jpeg',
+    });
+
+    try {
+        const response = await fetch(`${SERVER_URL}/upload?team=${id}`, {
+            method: 'POST',
+            body: data,
+        });
+        
+        if (!response.ok) throw new Error("Échec de l'upload");
+        return await response.blob();
+    } catch (error) {
+        console.error("Erreur uploadImage :", error);
+        throw error;
+    }
+};
+
+export const enemyImage = (id) => {
+    if (!id) return require('../assets/images/missing_image.jpg');
+    
+    return {uri: `${SERVER_URL}/photo/enemy?team=${id}`};
+};

mobile/traque-app/src/services/socket.js

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+// Socket
+import { io } from "socket.io-client";
+// Constants
+import { SOCKET_URL } from "../constants";
+
+export const socket = io(SOCKET_URL, {
+    path: "/back/socket.io"
+});

mobile/traque-app/src/services/socketEmitter.js

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+// Services
+import { socket } from "./socket";
+
+export const emitLogin = (password, callback) => {
+    if (!socket?.connected) return;
+    console.log("Try to log in with :", password);
+    socket.emit("login", password, callback);
+};
+
+export const emitLogout = () => {
+    if (!socket?.connected) return;
+    console.log("Logout.");
+    socket.emit("logout");
+};
+
+export const emitSendPosition = () => {
+    if (!socket?.connected) return;
+    console.log("Reveal position.");
+    socket.emit("send_position");
+};
+
+export const emitUpdatePosition = (location) => {
+    if (!socket?.connected) return;
+    console.log("Update position :", location);
+    socket.emit("update_position", location);
+};
+
+export const emitCapture = (captureCode, callback) => {
+    if (!socket?.connected) return;
+    console.log("Try to capture :", captureCode);
+    socket.emit("capture", captureCode, callback);
+};
+
+export const emitBattery = (level) => {
+    if (!socket?.connected) return;
+    console.log("Send battery level.");
+    socket.emit('battery_update', level);
+};
+
+export const emitDeviceInfo = (infos) => {
+    if (!socket?.connected) return;
+    console.log("Send device infos.");
+    socket.emit('device_info', infos);
+};