import UIKit

class CopyableLabel: UILabel {
  
  override init(frame: CGRect) {
    super.init(frame: frame)
    self.sharedInit()
  }
  
  required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    self.sharedInit()
  }
  
  func sharedInit() {
    self.isUserInteractionEnabled = true
    let gesture = UILongPressGestureRecognizer(target: self, action: #selector(self.showMenu))
    self.addGestureRecognizer(gesture)
  }
  
  @objc func showMenu(_ recognizer: UILongPressGestureRecognizer) {
    self.becomeFirstResponder()
    
    let menu = UIMenuController.shared
    
    let locationOfTouchInLabel = recognizer.location(in: self)
    
    if !menu.isMenuVisible {
      var rect = bounds
      rect.origin = locationOfTouchInLabel
      rect.size = CGSize(width: 1, height: 1)
      
      if #available(iOS 13.0, *) {
        menu.showMenu(from: self, rect: rect)
      } else {
        // Fallback on earlier versions
      }
    }
  }
  
  override func copy(_ sender: Any?) {
    let board = UIPasteboard.general
    
    board.string = text
    
    let menu = UIMenuController.shared
    
    if #available(iOS 13.0, *) {
      menu.showMenu(from: self, rect: bounds)
    } else {
      menu.setMenuVisible(false, animated: true)
    }
  }
  
  override var canBecomeFirstResponder: Bool {
    return true
  }
  
  override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
    return action == #selector(UIResponderStandardEditActions.copy)
  }
}