import json
from flask import current_app
from pywebpush import webpush, WebPushException
from ktvmanager.lib.database import delete_push_subscription

def send_notification(subscription_json, message_body):
    try:
        subscription_info = json.loads(subscription_json)
        webpush(
            subscription_info=subscription_info,
            data=message_body,
            vapid_private_key=current_app.config["VAPID_PRIVATE_KEY"],
            vapid_claims={"sub": current_app.config["VAPID_CLAIM_EMAIL"]},
        )
    except WebPushException as ex:
        print(f"Web push error: {ex}")
        if ex.response and ex.response.status_code == 410:
            print("Subscription is no longer valid, removing from DB.")
            delete_push_subscription(subscription_json)