MessageKit/Example/Sources/ConversationViewController.swift

/*
 MIT License
 
 Copyright (c) 2017-2018 MessageKit
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:
 
 The above copyright notice and this permission notice shall be included in all
 copies or substantial portions of the Software.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */

import UIKit
import MessageKit
import MapKit

internal class ConversationViewController: MessagesViewController {

    let refreshControl = UIRefreshControl()
    
    var messageList: [MockMessage] = []
    
    var isTyping = false

    override func viewDidLoad() {
        super.viewDidLoad()
    
        let messagesToFetch = UserDefaults.standard.mockMessagesCount()
        
        DispatchQueue.global(qos: .userInitiated).async {
            SampleData.shared.getMessages(count: messagesToFetch) { messages in
                DispatchQueue.main.async {
                    self.messageList = messages
                    self.messagesCollectionView.reloadData()
                    self.messagesCollectionView.scrollToBottom()
                }
            }
        }

        messagesCollectionView.messagesDataSource = self
        messagesCollectionView.messagesLayoutDelegate = self
        messagesCollectionView.messagesDisplayDelegate = self
        messagesCollectionView.messageCellDelegate = self
        messageInputBar.delegate = self

        messageInputBar.sendButton.tintColor = UIColor(red: 69/255, green: 193/255, blue: 89/255, alpha: 1)
        scrollsToBottomOnKeybordBeginsEditing = true // default false
        maintainPositionOnKeyboardFrameChanged = true // default false
        
        messagesCollectionView.addSubview(refreshControl)
        refreshControl.addTarget(self, action: #selector(ConversationViewController.loadMoreMessages), for: .valueChanged)
        
        navigationItem.rightBarButtonItems = [
            UIBarButtonItem(image: UIImage(named: "ic_keyboard"),
                            style: .plain,
                            target: self,
                            action: #selector(ConversationViewController.handleKeyboardButton)),
            UIBarButtonItem(image: UIImage(named: "ic_typing"),
                            style: .plain,
                            target: self,
                            action: #selector(ConversationViewController.handleTyping))
        ]
    }
    
    @objc func handleTyping() {
        
        defer {
            isTyping = !isTyping
        }
        
        if isTyping {
            
            messageInputBar.topStackView.arrangedSubviews.first?.removeFromSuperview()
            messageInputBar.topStackViewPadding = .zero
            
        } else {
            
            let label = UILabel()
            label.text = "nathan.tannar is typing..."
            label.font = UIFont.boldSystemFont(ofSize: 16)
            messageInputBar.topStackView.addArrangedSubview(label)
            messageInputBar.topStackViewPadding.top = 6
            messageInputBar.topStackViewPadding.left = 12
            
            // The backgroundView doesn't include the topStackView. This is so things in the topStackView can have transparent backgrounds if you need it that way or another color all together
            messageInputBar.backgroundColor = messageInputBar.backgroundView.backgroundColor
            
        }

    }
    
    @objc func loadMoreMessages() {
        DispatchQueue.global(qos: .userInitiated).asyncAfter(deadline: DispatchTime.now() + 4) {
            SampleData.shared.getMessages(count: 10) { messages in
                DispatchQueue.main.async {
                    self.messageList.insert(contentsOf: messages, at: 0)
                    self.messagesCollectionView.reloadDataAndKeepOffset()
                    self.refreshControl.endRefreshing()
                }
            }
        }
    }
    
    @objc func handleKeyboardButton() {
        
        messageInputBar.inputTextView.resignFirstResponder()
        let actionSheetController = UIAlertController(title: "Change Keyboard Style", message: nil, preferredStyle: .actionSheet)
        let actions = [
            UIAlertAction(title: "Slack", style: .default, handler: { _ in
                DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1, execute: {
                    self.slack()
                })
            }),
            UIAlertAction(title: "iMessage", style: .default, handler: { _ in
                DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1, execute: {
                    self.iMessage()
                })
            }),
            UIAlertAction(title: "Default", style: .default, handler: { _ in
                DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1, execute: {
                    self.defaultStyle()
                })
            }),
            UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
        ]
        actions.forEach { actionSheetController.addAction($0) }
        actionSheetController.view.tintColor = UIColor(red: 69/255, green: 193/255, blue: 89/255, alpha: 1)
        present(actionSheetController, animated: true, completion: nil)
    }
    
    // MARK: - Keyboard Style

    func slack() {
        defaultStyle()
        messageInputBar.backgroundView.backgroundColor = .white
        messageInputBar.isTranslucent = false
        messageInputBar.inputTextView.backgroundColor = .clear
        messageInputBar.inputTextView.layer.borderWidth = 0
        let items = [
            makeButton(named: "ic_camera").onTextViewDidChange { button, textView in
                button.isEnabled = textView.text.isEmpty
            },
            makeButton(named: "ic_at").onSelected {
                $0.tintColor = UIColor(red: 69/255, green: 193/255, blue: 89/255, alpha: 1)
            },
            makeButton(named: "ic_hashtag").onSelected {
                $0.tintColor = UIColor(red: 69/255, green: 193/255, blue: 89/255, alpha: 1)
            },
            .flexibleSpace,
            makeButton(named: "ic_library").onTextViewDidChange { button, textView in
                button.tintColor = UIColor(red: 69/255, green: 193/255, blue: 89/255, alpha: 1)
                button.isEnabled = textView.text.isEmpty
            },
            messageInputBar.sendButton
                .configure {
                    $0.layer.cornerRadius = 8
                    $0.layer.borderWidth = 1.5
                    $0.layer.borderColor = $0.titleColor(for: .disabled)?.cgColor
                    $0.setTitleColor(.white, for: .normal)
                    $0.setTitleColor(.white, for: .highlighted)
                    $0.setSize(CGSize(width: 52, height: 30), animated: true)
                }.onDisabled {
                    $0.layer.borderColor = $0.titleColor(for: .disabled)?.cgColor
                    $0.backgroundColor = .white
                }.onEnabled {
                    $0.backgroundColor = UIColor(red: 69/255, green: 193/255, blue: 89/255, alpha: 1)
                    $0.layer.borderColor = UIColor.clear.cgColor
                }.onSelected {
                    // We use a transform becuase changing the size would cause the other views to relayout
                    $0.transform = CGAffineTransform(scaleX: 1.2, y: 1.2)
                }.onDeselected {
                    $0.transform = CGAffineTransform.identity
            }
        ]
        items.forEach { $0.tintColor = .lightGray }
        
        // We can change the container insets if we want
        messageInputBar.inputTextView.textContainerInset = UIEdgeInsets(top: 8, left: 0, bottom: 8, right: 0)
        messageInputBar.inputTextView.placeholderLabelInsets = UIEdgeInsets(top: 8, left: 5, bottom: 8, right: 5)
        
        // Since we moved the send button to the bottom stack lets set the right stack width to 0
        messageInputBar.setRightStackViewWidthConstant(to: 0, animated: true)
        
        // Finally set the items
        messageInputBar.setStackViewItems(items, forStack: .bottom, animated: true)
    }
    
    func iMessage() {
        defaultStyle()
        messageInputBar.isTranslucent = false
        messageInputBar.backgroundView.backgroundColor = .white
        messageInputBar.separatorLine.isHidden = true
        messageInputBar.inputTextView.backgroundColor = UIColor(red: 245/255, green: 245/255, blue: 245/255, alpha: 1)
        messageInputBar.inputTextView.placeholderTextColor = UIColor(red: 0.6, green: 0.6, blue: 0.6, alpha: 1)
        messageInputBar.inputTextView.textContainerInset = UIEdgeInsets(top: 8, left: 16, bottom: 8, right: 36)
        messageInputBar.inputTextView.placeholderLabelInsets = UIEdgeInsets(top: 8, left: 20, bottom: 8, right: 36)
        messageInputBar.inputTextView.layer.borderColor = UIColor(red: 200/255, green: 200/255, blue: 200/255, alpha: 1).cgColor
        messageInputBar.inputTextView.layer.borderWidth = 1.0
        messageInputBar.inputTextView.layer.cornerRadius = 16.0
        messageInputBar.inputTextView.layer.masksToBounds = true
        messageInputBar.inputTextView.scrollIndicatorInsets = UIEdgeInsets(top: 8, left: 0, bottom: 8, right: 0)
        messageInputBar.setRightStackViewWidthConstant(to: 36, animated: true)
        messageInputBar.setStackViewItems([messageInputBar.sendButton], forStack: .right, animated: true)
        messageInputBar.sendButton.imageView?.backgroundColor = UIColor(red: 69/255, green: 193/255, blue: 89/255, alpha: 1)
        messageInputBar.sendButton.contentEdgeInsets = UIEdgeInsets(top: 2, left: 2, bottom: 2, right: 2)
        messageInputBar.sendButton.setSize(CGSize(width: 36, height: 36), animated: true)
        messageInputBar.sendButton.image = #imageLiteral(resourceName: "ic_up")
        messageInputBar.sendButton.title = nil
        messageInputBar.sendButton.imageView?.layer.cornerRadius = 16
        messageInputBar.sendButton.backgroundColor = .clear
        messageInputBar.textViewPadding.right = -38
    }
    
    func defaultStyle() {
        let newMessageInputBar = MessageInputBar()
        newMessageInputBar.sendButton.tintColor = UIColor(red: 69/255, green: 193/255, blue: 89/255, alpha: 1)
        newMessageInputBar.delegate = self
        messageInputBar = newMessageInputBar
        reloadInputViews()
    }
    
    // MARK: - Helpers
    
    func makeButton(named: String) -> InputBarButtonItem {
        return InputBarButtonItem()
            .configure {
                $0.spacing = .fixed(10)
                $0.image = UIImage(named: named)?.withRenderingMode(.alwaysTemplate)
                $0.setSize(CGSize(width: 30, height: 30), animated: true)
            }.onSelected {
                $0.tintColor = UIColor(red: 69/255, green: 193/255, blue: 89/255, alpha: 1)
            }.onDeselected {
                $0.tintColor = UIColor.lightGray
            }.onTouchUpInside { _ in
                print("Item Tapped")
        }
    }
}

// MARK: - MessagesDataSource

extension ConversationViewController: MessagesDataSource {

    func currentSender() -> Sender {
        return SampleData.shared.currentSender
    }
    
    func numberOfSections(in messagesCollectionView: MessagesCollectionView) -> Int {
        return messageList.count
    }

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

    func cellTopLabelAttributedText(for message: MessageType, at indexPath: IndexPath) -> NSAttributedString? {
        let name = message.sender.displayName
        return NSAttributedString(string: name, attributes: [NSAttributedStringKey.font: UIFont.preferredFont(forTextStyle: .caption1)])
    }

    func cellBottomLabelAttributedText(for message: MessageType, at indexPath: IndexPath) -> NSAttributedString? {

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

        let dateString = formatter.string(from: message.sentDate)
        return NSAttributedString(string: dateString, attributes: [NSAttributedStringKey.font: UIFont.preferredFont(forTextStyle: .caption2)])
    }

}

// MARK: - MessagesDisplayDelegate

extension ConversationViewController: MessagesDisplayDelegate {

    // MARK: - Text Messages

    func textColor(for message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> UIColor {
        return isFromCurrentSender(message: message) ? .white : .darkText
    }

    func detectorAttributes(for detector: DetectorType, and message: MessageType, at indexPath: IndexPath) -> [NSAttributedStringKey: Any] {
        return MessageLabel.defaultAttributes
    }

    func enabledDetectors(for message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> [DetectorType] {
        return [.url, .address, .phoneNumber, .date, .transitInformation]
    }

    // MARK: - All Messages
    
    func backgroundColor(for message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> UIColor {
        return isFromCurrentSender(message: message) ? UIColor(red: 69/255, green: 193/255, blue: 89/255, alpha: 1) : UIColor(red: 230/255, green: 230/255, blue: 230/255, alpha: 1)
    }

    func messageStyle(for message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> MessageStyle {
        let corner: MessageStyle.TailCorner = isFromCurrentSender(message: message) ? .bottomRight : .bottomLeft
        return .bubbleTail(corner, .curved)
//        let configurationClosure = { (view: MessageContainerView) in}
//        return .custom(configurationClosure)
    }
    
    func configureAvatarView(_ avatarView: AvatarView, for message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) {
        let avatar = SampleData.shared.getAvatarFor(sender: message.sender)
        avatarView.set(avatar: avatar)
    }

    // MARK: - Location Messages

    func annotationViewForLocation(message: MessageType, at indexPath: IndexPath, in messageCollectionView: MessagesCollectionView) -> MKAnnotationView? {
        let annotationView = MKAnnotationView(annotation: nil, reuseIdentifier: nil)
        let pinImage = #imageLiteral(resourceName: "pin")
        annotationView.image = pinImage
        annotationView.centerOffset = CGPoint(x: 0, y: -pinImage.size.height / 2)
        return annotationView
    }

    func animationBlockForLocation(message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> ((UIImageView) -> Void)? {
        return { view in
            view.layer.transform = CATransform3DMakeScale(0, 0, 0)
            view.alpha = 0.0
            UIView.animate(withDuration: 0.6, delay: 0, usingSpringWithDamping: 0.9, initialSpringVelocity: 0, options: [], animations: {
                view.layer.transform = CATransform3DIdentity
                view.alpha = 1.0
            }, completion: nil)
        }
    }
    
    func snapshotOptionsForLocation(message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> LocationMessageSnapshotOptions {
        
        return LocationMessageSnapshotOptions()
    }
}

// MARK: - MessagesLayoutDelegate

extension ConversationViewController: MessagesLayoutDelegate {

    func cellTopLabelHeight(for message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> CGFloat {
        return 16
    }

    func cellBottomLabelHeight(for message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> CGFloat {
        return 16
    }

    private func footerViewSize(for indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> CGSize {
        return CGSize(width: messagesCollectionView.bounds.width, height: 10)
    }
}

// MARK: - MessageCellDelegate

extension ConversationViewController: MessageCellDelegate {

    func didTapAvatar(in cell: MessageCollectionViewCell) {
        print("Avatar tapped")
    }

    func didTapMessage(in cell: MessageCollectionViewCell) {
        print("Message tapped")
    }

    func didTapTopLabel(in cell: MessageCollectionViewCell) {
        print("Top label tapped")
    }

    func didTapBottomLabel(in cell: MessageCollectionViewCell) {
        print("Bottom label tapped")
    }

}

// MARK: - MessageLabelDelegate

extension ConversationViewController: MessageLabelDelegate {

    func didSelectAddress(_ addressComponents: [String: String]) {
        print("Address Selected: \(addressComponents)")
    }

    func didSelectDate(_ date: Date) {
        print("Date Selected: \(date)")
    }

    func didSelectPhoneNumber(_ phoneNumber: String) {
        print("Phone Number Selected: \(phoneNumber)")
    }

    func didSelectURL(_ url: URL) {
        print("URL Selected: \(url)")
    }
    
    func didSelectTransitInformation(_ transitInformation: [String: String]) {
        print("TransitInformation Selected: \(transitInformation)")
    }

}

// MARK: - MessageInputBarDelegate

extension ConversationViewController: MessageInputBarDelegate {

    func messageInputBar(_ inputBar: MessageInputBar, didPressSendButtonWith text: String) {
        
        // Each NSTextAttachment that contains an image will count as one empty character in the text: String
        
        for component in inputBar.inputTextView.components {
            
            if let image = component as? UIImage {
                
                let imageMessage = MockMessage(image: image, sender: currentSender(), messageId: UUID().uuidString, date: Date())
                messageList.append(imageMessage)
                messagesCollectionView.insertSections([messageList.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(attributedText: attributedText, sender: currentSender(), messageId: UUID().uuidString, date: Date())
                messageList.append(message)
                messagesCollectionView.insertSections([messageList.count - 1])
            }
            
        }
        
        inputBar.inputTextView.text = String()
        messagesCollectionView.scrollToBottom()
    }

}