import React, { useState, useEffect, useRef } from 'react';
import { Platform } from 'react-native';
import * as Device from 'expo-device';
import * as Notifications from 'expo-notifications';
import Constants from 'expo-constants';
import type { NotificationMessage } from '@/constants/Types';

Notifications.setNotificationHandler({
  handleNotification: async () => ({
    shouldShowAlert: true,
    shouldPlaySound: true,
    shouldSetBadge: true,
  }),
});

export const sendPushNotification = async(expoPushToken: string, notification: NotificationMessage) => {
  const message = { 
    to: expoPushToken,
    sound: notification.sound ?? 'default',
    title: notification.title,
    body: notification.body,
    data: notification.data ?? {},
  };
  await fetch('https://exp.host/--/api/v2/push/send', {
    method: 'POST',
    headers: {
      Accept: 'application/json',
      'Accept-encoding': 'gzip, deflate',
      'Content-Type': 'application/json',
    },
    body: JSON.stringify(message),
    });
};

const handleRegistrationError = (errorMessage: string) => {
  alert(errorMessage);
  throw new Error(errorMessage);
};

const registerforPushNotificationsAsync = async () => {
  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;
    }
    const projectId = Constants.expoConfig?.extra?.eas?.projectId;
    if (!projectId) {
      alert('Project ID not found in eas.json');
      return;
    }
    token = (await Notifications.getExpoPushTokenAsync({ projectId })).data;
  } else {
    alert('Must use physical device for Push Notifications');
  }
  return token;
};

export const PushNotificationManager = ({children}: {children: React.ReactNode}) => {
  const [expoPushToken, setExpoPushToken] = useState('');
  const [notification, setNotification] =
    useState<Notifications.Notification | undefined>(undefined);
  const notificationListener = useRef<Notifications.Subscription>();
  const responseListener = useRef<Notifications.Subscription>();

  useEffect(() => {
    registerforPushNotificationsAsync()
      .then(token => setExpoPushToken(token ?? ''))
      .catch((error: any) => {
        setExpoPushToken('');
        console.error(error);
      });

    notificationListener.current = Notifications.addNotificationReceivedListener(
      notification => {
        setNotification(notification); 
    });
    responseListener.current = Notifications.addNotificationResponseReceivedListener(
      response => {
        console.log(response);
        // Handle notification response here
    });
    return () => {
      notificationListener.current &&
        Notifications.removeNotificationSubscription(notificationListener.current);
      responseListener.current &&
        Notifications.removeNotificationSubscription(responseListener.current);
    };
  }, []);
  return ( <> {children} </> );
};