eqn.ios/Sources/EQNNotificationService/NotificationService+Extension.swift

//
//  NotificationService+Extension.swift
//  EQNNotificationService
//
//  Created by Andrea Busi on 28/05/22.
//  Copyright © 2022 Earthquake Network. All rights reserved.
//

import Foundation
import UserNotifications


extension NotificationService {
    
    @objc(removeNotificationsForType:completion:)
    func removeNotifications(
        for type: String?,
        completion: @escaping() -> Void
    ) {
        guard let type = type else {
            completion()
            return
        }
        
        let notificationCenter = UNUserNotificationCenter.current()
        
        notificationCenter.getDeliveredNotifications { notifications in
            let sameTypeNotifications = notifications.filter { notification in
                let payload = notification.request.content.userInfo
                if let notificationType = payload["type"] as? String {
                    return notificationType == type
                }
                return false
            }
            
            let identifiers = sameTypeNotifications.map { $0.request.identifier }
            notificationCenter.removeDeliveredNotifications(withIdentifiers: identifiers)
            
            // !! Note: this is a known issue/bug
            // we need to add a delay before invoking the completion, otherwise the notification will not be remved
            // ref: https://stackoverflow.com/questions/53697279/why-are-notifications-not-removed-with-removedeliverednotifications
            DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
                completion()
            }
        }
    }
}