PushNotificationHelper.js

import * as Notifications from 'expo-notifications';
import { Platform } from 'react-native';
import * as Device from 'expo-device';
import Constants from 'expo-constants';
import axios from 'axios';
import { Base_url } from './Config/BaseUrl';

export async function registerForPushNotificationsAsync(userId) {
  let token;

  if (Platform.OS === 'android') {
    await Notifications.setNotificationChannelAsync('default', {
      name: 'default',
      importance: Notifications.AndroidImportance.MAX,
      vibrationPattern: [0, 250, 250, 250],
      lightColor: '#FF231F7C',
    });
  }

  if (Device.isDevice) {
    const { status: existingStatus } = await Notifications.getPermissionsAsync();
    let finalStatus = existingStatus;
    if (existingStatus !== 'granted') {
      const { status } = await Notifications.requestPermissionsAsync();
      finalStatus = status;
    }
    if (finalStatus !== 'granted') {
      alert('Failed to get push token for push notification!');
      return;
    }

    try {
      const projectId = Constants.expoConfig.extra.eas.projectId ?? Constants.easConfig.projectId;
      if (!projectId) {
        throw new Error('Project ID not found');
      }

      token = (
        await Notifications.getExpoPushTokenAsync({
          projectId,
        })
      ).data;

      console.log("Expo Push Token:", token);
    } catch (e) {
      console.error("Error getting push token:", e);
    }
  } else {
    alert('Must use physical device for Push Notifications');
  }

  if (token) {
    try {
      const res = await axios.post(`${Base_url}api/users/${userId}/update-token`, { notificationToken: token });
      console.log("Response from token update:", res.data);
    } catch (error) {
      console.error("Error updating token on backend:", error.response ? error.response.data : error.message);
    }
  } else {
    console.error("Failed to obtain token");
  }

  return token;
}