import BSAutocomplete

/**
* Creating BSAutocomplete instance..
*/

///
/// - parameter basedOn: a targetView to be based on for which it is usually self.view of UIViewController's instnace. 
/// - parameter prefix: a prefix string to provoke an instance of BSAutocomplete into showing and being hidden. For example, it could be '#', '@' or '$'. 
/// - parameter data: a list of string for you to display, to be shown by an instance of BSAutocomplete.
/// - returns: BSAutocomplete instance

private lazy var autocomplete: BSAutocomplete = { [unowned self] in
  let autocomplete = BSAutocomplete(basedOn: self.view, prefix: Prefix.at.rawValue, data: hashtags)
  autocomplete.delegate = self

  return autocomplete
}()

extension ViewController: BSAutocompleteDelegate {
  func autoCompleteDidChooseItem(text: String, sender: Either<UITextView, UITextField>) -> Void {
    print("autoCompleteDidChooseItem : ", text)
  }

  func autoCompleteTextDidChange(text: String, sender: Either<UITextView, UITextField>) -> Void {
    print("autoCompleteTextDidChange : ", text)
  }

  func autoCompleteDidShow(sender: Either<UITextView, UITextField>) -> Void {
    print("autoCompleteDidShow")
  }

  func autoCompleteDidHide(sender: Either<UITextView, UITextField>) -> Void {
    print("autoCompleteDidHide!")
  }
}

override func viewDidLoad() {
  super.viewDidLoad()

  /**
  * Must apply this API in viewDidLoad or similar appropriate method time being called
  * before the use of BSAutocomplete's instance.
  */
  autocomplete.readyToUse()
}

// MARK: - UITextFieldDelegate Methods -
extension ViewController: UITextFieldDelegate {
  func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    /**
    * Must apply this API to keep track of the text being written.
    */
    autocomplete.observe(currentUserInput: string, from: .textField(textField))
    
    return true
  }
}

// MARK: - UITextViewDelegate Methods -
extension ViewController: UITextViewDelegate {
func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
  /**
  * Must apply this API to keep track of the text being written.
  */
  autocomplete.observe(currentUserInput: text, from: .textView(textView))
  
  return true
}