Implement one signal and save token of user

app/(tabs)/index.tsx

@@ -5,6 +5,7 @@ import CalendarPicker from 'react-native-calendar-picker';
 import Ionicons from '@expo/vector-icons/Ionicons';
 import { useIsFocused } from '@react-navigation/core';
 import { useSelector } from 'react-redux';
+import { LogLevel, OneSignal } from 'react-native-onesignal';
 
 import { ThemedText } from '@/lib/components/ThemedText';
 import { ThemedView } from '@/lib/components/ThemedView';
@@ -13,6 +14,7 @@ import { useColorScheme } from '@/lib/hooks/useColorScheme';
 import { useToken } from '@/lib/context/AppProvider';
 import { Request } from '@/lib/services/request';
 import List from '@/lib/components/List';
+import { Message } from '@/lib/services/message';
 
 export default function HomeScreen() {
     const colorScheme = useColorScheme() ?? 'light';
@@ -23,6 +25,37 @@ export default function HomeScreen() {
     const [ name, setName ] = useState( ' ' ); // Default empty space to prevent layout shifting
     const [ dates, setDates ] = useState<any | null>( [] );
     const [ types, setTypes ] = useState<any | null>( [] );
+    const [ onesignalLoaded, setOnesignalLoaded ] = useState<any | null>( false );
+
+    const loadOneSignal = () => {
+        // Remove this method to stop OneSignal Debugging
+        OneSignal.Debug.setLogLevel(LogLevel.Verbose);
+
+        // OneSignal Initialization
+        OneSignal.initialize("6ef15aa7-9dc0-4d8b-b6b1-e2005bcd3dc6");
+
+        // Request permission
+        OneSignal.Notifications.requestPermission(true)
+
+        // Retrieve one signal user token
+        OneSignal.User.pushSubscription.getIdAsync().then((notificationsToken) => {
+            if (notificationsToken) {
+                Request.post( 'sessions/update', { token: token, notifications_token: notificationsToken } ).then( (response) => {
+                    if (!response.success) {
+                        Message.error( 'Notificaties zijn uitgeschakeld door een onbekende error' );
+                    }
+                } );
+            }
+        })
+
+        // Disable loading again
+        setOnesignalLoaded(true);
+    }
+
+    // Load OneSignal
+    useEffect( () => {
+        loadOneSignal();
+    }, [onesignalLoaded] );
 
     // Load session
     useEffect( () => {