deltachat-ios/deltachat-ios/Controller/NewContactController.swift

//
//  NewContactController.swift
//  deltachat-ios
//
//  Created by Jonas Reinsch on 17.11.17.
//  Copyright © 2017 Jonas Reinsch. All rights reserved.
//

import UIKit

class NewContactController: UITableViewController {
  let emailCell = TextFieldCell.makeEmailCell()
  let nameCell = TextFieldCell.makeNameCell()
  var doneButton: UIBarButtonItem?
  var cancelButton: UIBarButtonItem?

  func contactIsValid() -> Bool {
    return Utils.isValid(model.email)
  }

  var model: (name: String, email: String) = ("", "") {
    didSet {
      if contactIsValid() {
        doneButton?.isEnabled = true
      } else {
        doneButton?.isEnabled = false
      }
    }
  }

  let cells: [UITableViewCell]

  // for editing existing contacts (only
  // the name may be edited, therefore disable
  // the email field)
  convenience init(contactIdForUpdate: Int) {
    self.init()
    title = "Edit Contact"

    let contact = MRContact(id: contactIdForUpdate)
    nameCell.textField.text = contact.name
    emailCell.textField.text = contact.email
    emailCell.textField.isEnabled = false
    emailCell.contentView.alpha = 0.3

    model.name = contact.name
    model.email = contact.email

    if contactIsValid() {
      doneButton?.isEnabled = true
    }
  }

  // for creating a new contact
  init() {
    cells = [emailCell, nameCell]
    super.init(style: .grouped)
    emailCell.textField.delegate = self
    nameCell.textField.delegate = self

    // always show return key with name field, because
    // name is optional
    nameCell.textField.enablesReturnKeyAutomatically = false
    emailCell.textField.returnKeyType = .next
    nameCell.textField.returnKeyType = .done

    title = "New Contact"
    doneButton = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(NewContactController.saveContactButtonPressed))
    doneButton?.isEnabled = false
    navigationItem.rightBarButtonItem = doneButton

    cancelButton = UIBarButtonItem(barButtonSystemItem: .cancel, target: self, action: #selector(NewContactController.cancelButtonPressed))
    navigationItem.leftBarButtonItem = cancelButton

    emailCell.textField.addTarget(self, action: #selector(NewContactController.emailTextChanged), for: UIControl.Event.editingChanged)
    nameCell.textField.addTarget(self, action: #selector(NewContactController.nameTextChanged), for: UIControl.Event.editingChanged)
  }

  override func viewDidAppear(_: Bool) {
    if emailCell.textField.isEnabled {
      emailCell.textField.becomeFirstResponder()
    } else {
      nameCell.textField.becomeFirstResponder()
    }
  }

  override func viewWillAppear(_: Bool) {
    navigationController?.setNavigationBarHidden(false, animated: false)
    navigationController?.navigationBar.prefersLargeTitles = false
  }

  @objc func emailTextChanged() {
    let emailText = emailCell.textField.text ?? ""
    model.email = emailText
  }

  @objc func nameTextChanged() {
    let nameText = nameCell.textField.text ?? ""
    model.name = nameText
  }

  @objc func saveContactButtonPressed() {
    dc_create_contact(mailboxPointer, model.name, model.email)
    navigationController?.popViewController(animated: true)
  }

  @objc func cancelButtonPressed() {
    navigationController?.popViewController(animated: true)
  }

  required init?(coder _: NSCoder) {
    fatalError("init(coder:) has not been implemented")
  }

  override func viewDidLoad() {
    super.viewDidLoad()

    navigationController?.navigationBar.prefersLargeTitles = true
  }

  override func tableView(_: UITableView, numberOfRowsInSection _: Int) -> Int {
    return cells.count
  }

  override func tableView(_: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let row = indexPath.row

    return cells[row]
  }

  override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
  }
}

extension NewContactController: UITextFieldDelegate {
  func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    if textField == emailCell.textField {
      // only switch to next line if email is valid
      if contactIsValid() {
        nameCell.textField.becomeFirstResponder()
      }
    } else if textField == nameCell.textField {
      if contactIsValid() {
        saveContactButtonPressed()
      }
    }
    return true
  }
}