class MyViewController : UIViewController, ParlaViewDataSource, ParlaViewDelegate { 
    // The main sender. His messages are considered as Outgoing, all the messages of other senders will be considerer as   Incoming messages.
    var mSender: PSender!
    
    // The array of messages
    var messages: [PMessage]!
    
    // The core of the library: The ParlaView class
    @IBOutlet var parlaView: ParlaView!

override func viewDidLoad() {


    // The avatars of the senders. If you do not want an avatar pass nil and disable avatar in the config
    // class before initializing: Parla.config.avatar.isHidden = true
    let domenicoAvatar = PAvatar(withImage: UIImage(named: "domenico.jpeg")!)
    let chiaraAvatar = PAvatar(withImage: UIImage(named: "chiara.jpg")!)

    // In this example we have 2 message senders
    mainSender = Parla.outgoingSender(id: 10, name: "Domenico", avatar: domenicoAvatar)
    let chiara = PIncomingSender(id: 11, name: "Chiara", avatar: chiaraAvatar)

    let config = Parla.config
    config.accessoryButton.preventDefault = false
    config.cell.isBottomLabelHidden = false
    config.avatar.isHidden = false

    // This color will be used if you pass a nil avatar to a sender but do not set the isHidden property to true.
    config.avatar.backgroundColor = UIColor.black

    // Initialization of ParlaView class
    parlaView.initialize(dataSource: self, delegate: self)

    // This is a test video taken from the main bundle.
    let mondello = Bundle.main.url(forResource: "mondello", withExtension: "mp4")!

    // Adding some test messages
    self.messages = [
        Parla.newTextMessage(id: 1, sender: mainSender, text: "Hi Chiara! How are you? :)"),
        Parla.newTextMessage(id: 2, sender: chiara, text: "Hi Domenico, all right! I'm sitting on a deckchiar here in the wonderful beach of Mondello, in Palermo (Italy)  :)"),
        Parla.newTextMessage(id: 3, sender: mainSender, text: "Waw! Tha's awesome! I can't wait to see a picture of you in this wonderful place!"),
        Parla.newImageMessage(id: 4, sender: chiara, image: UIImage(named: "mondello-beach.jpg")!),
        Parla.newVideoMessage(id: 5, sender: chiara, videoUrl: mondello),
        Parla.newTextMessage(id: 6, sender: mainSender, text: "Amazing, i'm coming right now!"),
    ]


    // Hide the top label every 4 times.
    for i in 0 ..< messages.count {
        messages[i].isTopLabelActive = (i % 4 == 0)
        // messages[i].isTopLabelActive = false
    }

func outgoingSender() -> POutgoingSender {
    return mainSender
}

func messageForCell(at indexPath: IndexPath, collectionView: UICollectionView) -> PMessage {
    return self.messages[indexPath.row]
}

func numberOfMessagesIn(collectionView: UICollectionView) -> Int {
    return self.messages.count
}

func didTapMessageBubble(at indexPath: IndexPath, message: PMessage, collectionView: UICollectionView) {
    // You can choose if the binded action with the tap event should occur.
    message.triggerSelection()
    print("===>> DID TAP MESSAGE BUBBLE \(message.toString) << ===")

}

func didPressSendButton(withMessage message: PMessage, textField: UITextField, collectionView: UICollectionView) {
    print("===>> DID PRESS SEND BUTTON \(message.toString) << ===")
    // ** Example of possible implementation **
    self.messages.append(message)
    textField.text = ""
    collectionView.reloadData()
    collectionView.scrollToBottom(animated: true)
    // **** //
}

func didPressAccessoryButton(button: UIView, collectionView: UICollectionView) {
    print("===>> DID PRESS ACCESSORY BUTTON << ===")
}