//
//  NotificationService.swift
//  NotificationServiceExtension
//
//  Created by Ajay Subramanya on 6/14/23.
//

import KlaviyoSwiftExtension
import UIKit
import UserNotifications

// MARK: notification service extension implementation.

/// When push payload is marked as there being mutable-content this service
/// (more specifically the `didReceiveNotificationRequest` ) is called to perform
/// tasks such as downloading images and attaching it to the notification before it's displayed to the user.
///
/// There is a limited time before which `didReceiveNotificationRequest`  needs to wrap up it's operations
/// else the notification is displayed as received.
///
/// Any property from `UNMutableNotificationContent` can be mutated here before presenting the notification.
class NotificationService: UNNotificationServiceExtension {
    var request: UNNotificationRequest!
    var contentHandler: ((UNNotificationContent) -> Void)?
    var bestAttemptContent: UNMutableNotificationContent?

    override func didReceive(
        _ request: UNNotificationRequest,
        withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
        self.request = request
        self.contentHandler = contentHandler
        bestAttemptContent = (request.content.mutableCopy() as? UNMutableNotificationContent)

        if let bestAttemptContent = bestAttemptContent {
            KlaviyoExtensionSDK.handleNotificationServiceDidReceivedRequest(
                request: self.request,
                bestAttemptContent: bestAttemptContent,
                contentHandler: contentHandler)
        }
    }

    override func serviceExtensionTimeWillExpire() {
        /// Called just before the extension will be terminated by the system.
        /// Use this as an opportunity to deliver your "best attempt" at modified content, otherwise the original push payload will be used.
        if let contentHandler = contentHandler,
           let bestAttemptContent = bestAttemptContent {
            KlaviyoExtensionSDK.handleNotificationServiceExtensionTimeWillExpireRequest(
                request: request,
                bestAttemptContent: bestAttemptContent,
                contentHandler: contentHandler)
        }
    }
}