import UIKit
import MessageKit
import AVFoundation

let senders: [Sender] = [Sender(id: "283476", displayName: "Bogdan Bystritskiy"),
                         Sender(id: "34556", displayName: "Valeria Ryabinicheva")
                        ]

var messages: [MockMessage] = [
                               MockMessage(sender: senders[0], messageId: senders[0].id, date: Date()-1505284,
                                           text: "Dealing With Technical Support 10 Useful Tips"),
                               MockMessage(sender: senders[1], messageId: senders[1].id, date: Date()-360364,
                                           text: "Are You Ready To Buy A Home Theater Audio System"),
                               MockMessage(sender: senders[0], messageId: senders[0].id, date: Date()-3600,
                                           text: "Motivation And Your Personal Vision An Unbeatable Force"),
                               MockMessage(sender: senders[1], messageId: senders[1].id, date: Date(), emoji: "😜"),
                               MockMessage(sender: senders[0], messageId: senders[0].id, date: Date()-3600,
                                           text: "Are You Ready To Buy A Home Theater Audio System"),
                               MockMessage(sender: senders[0], messageId: senders[0].id, date: Date()-3600,
                                           text: "Motivation And Your Personal Vision An Unbeatable Force"),
                               MockMessage(sender: senders[1], messageId: senders[1].id, date: Date()-3600,
                                           text: "Are You Ready To Buy A Home Theater Audio System"),
                               MockMessage(sender: senders[0], messageId: senders[0].id, date: Date()-3600,
                                           text: "Dealing With Technical Support 10 Useful Tips"),
                               MockMessage(sender: senders[0], messageId: senders[0].id, date: Date()-3600,
                                           text: "Motivation And Your Personal Vision An Unbeatable Force"),
                               MockMessage(sender: senders[1], messageId: senders[1].id, date: Date(), emoji: "🤯")
                               ]

class ChatDetailViewController: MessagesViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    var imagePicker = UIImagePickerController()

    lazy var formatter: DateFormatter = {
        let formatter = DateFormatter()
        formatter.dateStyle = .medium
        return formatter
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        configureNavigationBar()
        configureMessageView()
        hideKeyboardWhenTappedAround()
//        imagePicker.delegate = self
        DispatchQueue.main.async {
            self.messagesCollectionView.reloadData()
            self.messagesCollectionView.scrollToBottom()
        }
    }

    func hideKeyboardWhenTappedAround() {
        let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(dismissKeyboard))
        tapGestureRecognizer.cancelsTouchesInView = false
        messagesCollectionView.addGestureRecognizer(tapGestureRecognizer)
    }

    @objc func dismissKeyboard() {
        messageInputBar.inputTextView.resignFirstResponder()
    }

    func configureMessageView() {
        messagesCollectionView.messagesDataSource = self
        messagesCollectionView.messagesLayoutDelegate = self
        messagesCollectionView.messagesDisplayDelegate = self
        messageInputBar.delegate = self
        messagesCollectionView.backgroundColor = .twPaleGray
        maintainPositionOnKeyboardFrameChanged = true
        scrollsToBottomOnKeybordBeginsEditing = true

        messageInputBar.inputTextView.placeholder = "Напишите сообщение..."
        messageInputBar.sendButton.configure { (button) in
            button.image = UIImage(named: "sendButton")
            button.title = nil
        }

        let leftButton = InputBarButtonItem()
        leftButton.setImage(UIImage(named: "clip"), for: .normal)
        leftButton.addTarget(self, action: #selector(addMedia), for: .allTouchEvents)
        messageInputBar.setStackViewItems([leftButton], forStack: .left, animated: false)
        leftButton.snp.makeConstraints { (make) in
            make.centerY.equalTo(messageInputBar.sendButton.snp.centerY)
        }
        messageInputBar.setLeftStackViewWidthConstant(to: leftButton.intrinsicContentSize.width + 15, animated: false)

        if let img = UIImage(named: "oval") {
            messages.append(MockMessage(sender: currentSender(), messageId: currentSender().id, date: Date(), photo: img))
        }
    }

    @objc func addMedia() {
        if UIImagePickerController.isSourceTypeAvailable(.photoLibrary) {
            print("Button capture")

            imagePicker.delegate = self
            imagePicker.sourceType = .photoLibrary
            imagePicker.allowsEditing = false

            self.present(imagePicker, animated: true, completion: nil)
        }
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String: Any]) {
        if let image = info[UIImagePickerControllerLivePhoto] as? UIImage {
            messages.append(MockMessage(sender: currentSender(), messageId: currentSender().id, date: Date(), photo: image))
            picker.dismiss(animated: true, completion: nil)
        }
//        picker.dismiss(animated: true, completion: nil)
    }

    func configureNavigationBar() {
        if #available(iOS 11.0, *) {
            navigationController?.navigationBar.prefersLargeTitles = false
        }
        navigationController?.navigationBar.barTintColor = .twBlue
        navigationController?.navigationBar.tintColor = .white
        navigationItem.title = "Островский"
        if let chatImage = UIImage(named: "oval") {
            navigationItem.rightBarButtonItem = UIBarButtonItem(image: chatImage, style: .plain, target: self, action: nil)
        }
    }
}

extension ChatDetailViewController: MessagesDataSource {
    func numberOfMessages(in messagesCollectionView: MessagesCollectionView) -> Int {
        return messages.count
    }

    func currentSender() -> Sender {
        return Sender(id: "34556", displayName: "Valeria Ryabinicheva")
    }

    func numberOfSections(in messagesCollectionView: MessagesCollectionView) -> Int {
        return messages.count
    }

    func messageForItem(at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> MessageType {
        return messages[indexPath.section]
    }

    func cellTopLabelAttributedText(for message: MessageType, at indexPath: IndexPath) -> NSAttributedString? {
        let string = message.sender.displayName
        if message.sender != currentSender() {
            return NSAttributedString(string: string, attributes: [NSAttributedStringKey.foregroundColor: UIColor.twBlue,
                                                                   NSAttributedStringKey.font: UIFont.systemFont(ofSize: 12)])
        }
        return nil
    }

    func cellBottomLabelAttributedText(for message: MessageType, at indexPath: IndexPath) -> NSAttributedString? {
        let date = formatter.string(from: message.sentDate)
        return NSAttributedString(string: date, attributes: [NSAttributedStringKey.font: UIFont.systemFont(ofSize: 10),
                                                             NSAttributedStringKey.foregroundColor: UIColor.twLightGray])
    }
}

extension ChatDetailViewController: MessagesLayoutDelegate {
    func heightForLocation(message: MessageType, at indexPath: IndexPath, with maxWidth: CGFloat, in messagesCollectionView: MessagesCollectionView) -> CGFloat {
        return 100
    }
    func cellBottomLabelAlignment(for message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> LabelAlignment {
        return .messageTrailing(.zero)
    }
    func widthForMedia(message: MessageType, at indexPath: IndexPath, with maxWidth: CGFloat, in messagesCollectionView: MessagesCollectionView) -> CGFloat {
        return (view.frame.width / 3) * 2
    }
    func heightForMedia(message: MessageType, at indexPath: IndexPath, with maxWidth: CGFloat, in messagesCollectionView: MessagesCollectionView) -> CGFloat {
        return (view.frame.width / 3) * 2
    }
}

extension ChatDetailViewController: MessagesDisplayDelegate {
    func configureAvatarView(_ avatarView: AvatarView, for message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) {
        if let firstCharacter = message.sender.displayName.first {
            let initials = String(firstCharacter)
            avatarView.initials = initials
        }
    }
    func backgroundColor(for message: MessageType, at  indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> UIColor {
        switch message.data {
        case .emoji:
            return .clear
        case .photo:
            return .clear
        default:
            guard let dataSource = messagesCollectionView.messagesDataSource else { return .white }
            return dataSource.isFromCurrentSender(message: message) ? UIColor.twBlue : UIColor.white
        }
    }
}

extension ChatDetailViewController: MessageInputBarDelegate {

    func messageInputBar(_ inputBar: MessageInputBar, didPressSendButtonWith text: String) {
        for component in inputBar.inputTextView.components {

            if let image = component as? UIImage {
                let imageMessage = MockMessage(sender: currentSender(), messageId: currentSender().id, date: Date(), photo: image)
                messages.append(imageMessage)
                messagesCollectionView.insertSections([messages.count - 1])

            } else if let text = component as? String {

                let attributedText = NSAttributedString(string: text, attributes: [.font: UIFont.systemFont(ofSize: 15), .foregroundColor: UIColor.blue])

                let message = MockMessage(sender: currentSender(), messageId: currentSender().id, date: Date(), attributedText: attributedText)
                messages.append(message)
                messagesCollectionView.insertSections([messages.count - 1])
            }

        }
        inputBar.inputTextView.text = String()
        messagesCollectionView.scrollToBottom()
    }
}