                 self.finishReceivingMessage()
             }
                 
-                // image
+            // image
             else if let type = messageData["type"] as String!,
                 type == "image",
                 let id = messageData["senderId"] as String!,

        guard let asset = assets.firstObject else { return }
        guard let key = sendPhotoMessage() else { return }
        
        /*
         let manager = PHImageManager.default()
         manager.requestImage(for: asset, targetSize: CGSize(width: 640.0, height: 960.0), contentMode: .aspectFit, options: nil, resultHandler: { (result, info) -> Void in
         
         guard let result = result else { return }
         
         let path = "\(key).jpg"
         guard let data = UIImageJPEGRepresentation(result, 1.0) else { return }
         
         let metadata = FIRStorageMetadata()
         metadata.contentType = "image/jpeg"
         
         self.storageRef.child(path).put(data, metadata: metadata, completion: { (metadata, error) in
         if let error = error {
         print("Error uploading photo: \(error.localizedDescription)")
         return
         }
         guard let downloadUrl = metadata?.downloadURL()?.absoluteString else { return }
         
         self.setImageURL(downloadUrl, forPhotoMessageWithKey: key)
         })
         })
         */
        
        asset.requestContentEditingInput(with: nil, completionHandler: { (contentEditingInput, info) in
            guard let imageFileURL = contentEditingInput?.fullSizeImageURL else { return }
            
            let path = "\(key).jpg"
            self.storageRef.child(path).putFile(imageFileURL, metadata: nil) { (metadata, error) in
                if let error = error {
                    print("Error uploading photo: \(error.localizedDescription)")
                    return
                }
                guard let downloadUrl = metadata?.downloadURL()?.absoluteString else { return }
                
                self.setImageURL(downloadUrl, forPhotoMessageWithKey: key)
            }
        })
    }
    
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {

    }
    
    private func observeMessages() {
        let messageQuery = messageRef.queryLimited(toLast: 25)
        
        // We can use the observe method to listen for new
        // messages being written to the Firebase DB
