//
//  NotificationService.swift
//  NotificationService
//
//  Created by 南鑫林 on 2019/9/10.
//  Copyright © 2019 RainbowPlanet. All rights reserved.
//

import UserNotifications
import UIKit

class NotificationService: UNNotificationServiceExtension {

    var contentHandler: ((UNNotificationContent) -> Void)?
    var bestAttemptContent: UNMutableNotificationContent?

    override func didReceive(_ request: UNNotificationRequest, withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
        self.contentHandler = contentHandler
        //[modified]这个是一个标示，可以实现对服务器下发下来的内容进行更改
        bestAttemptContent = (request.content.mutableCopy() as? UNMutableNotificationContent)
        
        func failEarly() {
            contentHandler(request.content)
        }
        if let bestAttemptContent = bestAttemptContent {
            let apsDic = request.content.userInfo["aps"] as? [AnyHashable : Any]
            let attachUrl = apsDic?["image"] as? String
            let category = apsDic?["category"] as? String
            bestAttemptContent.categoryIdentifier = category ?? ""
            let url = URL(string: attachUrl ?? "")
            guard let imageData = NSData(contentsOf:url!) else { return failEarly() }
            
            let image = UIImage(data: imageData as Data)
            let identifier = ProcessInfo.processInfo.globallyUniqueString
            if let attachment = UNNotificationAttachment.create(identifier: identifier, image: image!, options: nil) {
                // where myImage is any UIImage that follows the
                bestAttemptContent.attachments = [attachment]
            }
            contentHandler(bestAttemptContent)
        }
    }
    
    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 {
            contentHandler(bestAttemptContent)
        }
    }

}

extension UNNotificationAttachment {
    
    static func create(identifier: String, image: UIImage, options: [NSObject : AnyObject]?) -> UNNotificationAttachment? {
        let fileManager = FileManager.default
        let tmpSubFolderName = ProcessInfo.processInfo.globallyUniqueString
        let tmpSubFolderURL = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(tmpSubFolderName, isDirectory: true)
        do {
            try fileManager.createDirectory(at: tmpSubFolderURL, withIntermediateDirectories: true, attributes: nil)
            let imageFileIdentifier = identifier+".png"
            let fileURL = tmpSubFolderURL.appendingPathComponent(imageFileIdentifier)
            guard let imageData = image.pngData() else {
                return nil
            }
            try imageData.write(to: fileURL)
            let imageAttachment = try UNNotificationAttachment.init(identifier: imageFileIdentifier, url: fileURL, options: options)
            return imageAttachment
        } catch {
            print("error " + error.localizedDescription)
        }
        return nil
    }
    
    /// Save the image to disk
    static func create(imageFileIdentifier: String, data: NSData, options: [NSObject : AnyObject]?) -> UNNotificationAttachment? {
        let fileManager = FileManager.default
        let tmpSubFolderName = ProcessInfo.processInfo.globallyUniqueString
        let tmpSubFolderURL = NSURL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(tmpSubFolderName, isDirectory: true)
        
        do {
            try fileManager.createDirectory(at: tmpSubFolderURL!, withIntermediateDirectories: true, attributes: nil)
            let fileURL = tmpSubFolderURL?.appendingPathComponent(imageFileIdentifier)
            try data.write(to: fileURL!, options: [])
            let imageAttachment = try UNNotificationAttachment.init(identifier: imageFileIdentifier, url: fileURL!, options: options)
            return imageAttachment
        } catch let error {
            print("error \(error)")
        }
        
        return nil
    }
}