/*
 Copyright 2016-present the Material Components for iOS authors. All Rights Reserved.

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */

// swiftlint:disable function_body_length

import MaterialComponents.MaterialTextFields

final class TextFieldManualLayoutLegacySwiftExample: UIViewController {

  private enum LayoutConstants {
    static let largeMargin: CGFloat = 16
    static let smallMargin: CGFloat = 8

    static let floatingHeight: CGFloat = 84
    static let defaultHeight: CGFloat = 62

    static let stateWidth: CGFloat = 80
  }

  let scrollView = UIScrollView()

  let name: MDCTextField = {
    let name = MDCTextField()
    name.autocapitalizationType = .words
    return name
  }()

  let address: MDCTextField = {
    let address = MDCTextField()
    address.autocapitalizationType = .words
    return address
  }()

  let city: MDCTextField = {
    let city = MDCTextField()
    city.autocapitalizationType = .words
    return city
  }()
  let cityController: MDCTextInputControllerLegacyDefault

  let state: MDCTextField = {
    let state = MDCTextField()
    state.autocapitalizationType = .allCharacters
    return state
  }()

  let zip: MDCTextField = {
    let zip = MDCTextField()
    return zip
  }()
  let zipController: MDCTextInputControllerLegacyDefault

  let phone: MDCTextField = {
    let phone = MDCTextField()
    return phone
  }()

  let stateZip = UIView()

  var allTextFieldControllers = [MDCTextInputControllerLegacyDefault]()

  override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
    cityController = MDCTextInputControllerLegacyDefault(textInput: city)
    zipController = MDCTextInputControllerLegacyDefault(textInput: zip)
    super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
  }

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

  deinit {
    NotificationCenter.default.removeObserver(self)
  }

  override func viewDidLoad() {
    super.viewDidLoad()
    view.backgroundColor = UIColor(white:0.97, alpha: 1.0)

    title = "Legacy Manual Text Fields"

    setupScrollView()
    setupTextFields()

    updateLayout()

    registerKeyboardNotifications()
    addGestureRecognizer()

    let styleButton = UIBarButtonItem(title: "Style",
                                      style: .plain,
                                      target: self,
                                      action: #selector(buttonDidTouch(sender: )))
    self.navigationItem.rightBarButtonItem = styleButton
  }

  override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    scrollView.frame = view.bounds
  }

  func setupTextFields() {
    scrollView.addSubview(name)
    let nameController = MDCTextInputControllerLegacyDefault(textInput: name)
    name.delegate = self
    nameController.placeholderText = "Name"
    allTextFieldControllers.append(nameController)

    scrollView.addSubview(address)
    let addressController = MDCTextInputControllerLegacyDefault(textInput: address)
    address.delegate = self
    addressController.placeholderText = "Address"
    allTextFieldControllers.append(addressController)

    scrollView.addSubview(city)
    city.delegate = self
    cityController.placeholderText = "City"
    allTextFieldControllers.append(cityController)

    scrollView.addSubview(stateZip)

    stateZip.addSubview(state)
    let stateController = MDCTextInputControllerLegacyDefault(textInput: state)
    state.delegate = self
    stateController.placeholderText = "State"
    allTextFieldControllers.append(stateController)

    stateZip.addSubview(zip)
    zip.delegate = self
    zipController.placeholderText = "Zip Code"
    zipController.helperText = "XXXXX"
    allTextFieldControllers.append(zipController)

    scrollView.addSubview(phone)
    let phoneController = MDCTextInputControllerLegacyDefault(textInput: phone)
    phone.delegate = self
    phoneController.placeholderText = "Phone Number"
    allTextFieldControllers.append(phoneController)

    var tag = 0
    for controller in allTextFieldControllers {
      guard let textField = controller.textInput as? MDCTextField else { continue }
      textField.tag = tag
      tag += 1
    }

  }

  func setupScrollView() {
    view.addSubview(scrollView)

    scrollView.contentSize =
      CGSize(width: scrollView.bounds.width - 2 * LayoutConstants.largeMargin,
             height: 500.0)
  }

  func addGestureRecognizer() {
    let tapRecognizer = UITapGestureRecognizer(target: self,
                                               action: #selector(tapDidTouch(sender: )))
    self.scrollView.addGestureRecognizer(tapRecognizer)
  }

  func updateLayout() {
    let commonWidth = view.bounds.width - 2 * LayoutConstants.largeMargin
    var height = LayoutConstants.floatingHeight
    if let controller = allTextFieldControllers.first {
      height = controller.isFloatingEnabled ?
        LayoutConstants.floatingHeight : LayoutConstants.defaultHeight
    }

    name.frame = CGRect(x: LayoutConstants.largeMargin,
                        y: LayoutConstants.smallMargin,
                        width: commonWidth,
                        height: height)

    address.frame = CGRect(x: LayoutConstants.largeMargin,
                           y: name.frame.minY + height + LayoutConstants.smallMargin,
                           width: commonWidth,
                           height: height)

    city.frame = CGRect(x: LayoutConstants.largeMargin,
                        y: address.frame.minY + height + LayoutConstants.smallMargin,
                        width: commonWidth,
                        height: height)

    stateZip.frame = CGRect(x: LayoutConstants.largeMargin,
                            y: city.frame.minY + height + LayoutConstants.smallMargin,
                            width: commonWidth,
                            height: height)

    state.frame = CGRect(x: 0,
                         y: 0,
                         width: LayoutConstants.stateWidth,
                         height: height)

    zip.frame = CGRect(x: LayoutConstants.stateWidth + LayoutConstants.smallMargin,
                       y: 0,
                       width: stateZip.bounds.width - LayoutConstants.stateWidth -
                        LayoutConstants.smallMargin,
                       height: height)

    phone.frame = CGRect(x: LayoutConstants.largeMargin,
                         y: stateZip.frame.minY + height + LayoutConstants.smallMargin,
                         width: commonWidth,
                         height: height)
  }

  // MARK: - Actions

  @objc func tapDidTouch(sender: Any) {
    self.view.endEditing(true)
  }

  @objc func buttonDidTouch(sender: Any) {
    let alert = UIAlertController(title: "Floating Enabled",
                                  message: nil,
                                  preferredStyle: .actionSheet)
    let defaultAction = UIAlertAction(title: "Default (Yes)", style: .default) { _ in
      self.allTextFieldControllers.forEach({ (controller) in
        controller.isFloatingEnabled = true
      })
      self.updateLayout()
    }
    alert.addAction(defaultAction)
    let floatingAction = UIAlertAction(title: "No", style: .default) { _ in
      self.allTextFieldControllers.forEach({ (controller) in
        controller.isFloatingEnabled = false
      })
      self.updateLayout()
    }
    alert.addAction(floatingAction)
    present(alert, animated: true, completion: nil)
  }
}

extension TextFieldManualLayoutLegacySwiftExample: UITextFieldDelegate {
  func textField(_ textField: UITextField,
                 shouldChangeCharactersIn range: NSRange,
                 replacementString string: String) -> Bool {
    guard let rawText = textField.text else {
      return true
    }

    let fullString = NSString(string: rawText).replacingCharacters(in: range, with: string)

    if textField == zip {
      if let range = fullString.rangeOfCharacter(from: CharacterSet.letters),
        fullString[range].characterCount > 0 {
        zipController.setErrorText("Error: Zip can only contain numbers",
                                   errorAccessibilityValue: nil)
      } else if fullString.characterCount > 5 {
        zipController.setErrorText("Error: Zip can only contain five digits",
                                   errorAccessibilityValue: nil)
      } else {
        zipController.setErrorText(nil, errorAccessibilityValue: nil)
      }
    } else if textField == city {
      if let range = fullString.rangeOfCharacter(from: CharacterSet.decimalDigits),
        fullString[range].characterCount > 0 {
        cityController.setErrorText("Error: City can only contain letters",
                                    errorAccessibilityValue: nil)
      } else {
        cityController.setErrorText(nil, errorAccessibilityValue: nil)
      }
    }
    return true
  }

  func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    let index = textField.tag
    if index + 1 < allTextFieldControllers.count,
      let nextField = allTextFieldControllers[index + 1].textInput {
      nextField.becomeFirstResponder()
    } else {
      textField.resignFirstResponder()
    }

    return false
  }
}

// MARK: - Keyboard Handling

extension TextFieldManualLayoutLegacySwiftExample {
  func registerKeyboardNotifications() {
    let notificationCenter = NotificationCenter.default
    notificationCenter.addObserver(
      self,
      selector: #selector(keyboardWillShow(notif:)),
      name: .UIKeyboardWillShow,
      object: nil)
    notificationCenter.addObserver(
      self,
      selector: #selector(keyboardWillShow(notif:)),
      name: .UIKeyboardWillChangeFrame,
      object: nil)
    notificationCenter.addObserver(
      self,
      selector: #selector(keyboardWillHide(notif:)),
      name: .UIKeyboardWillHide,
      object: nil)
  }

  @objc func keyboardWillShow(notif: Notification) {
    guard let frame = notif.userInfo?[UIKeyboardFrameEndUserInfoKey] as? CGRect else {
      return
    }
    scrollView.contentInset = UIEdgeInsets(top: 0.0,
                                           left: 0.0,
                                           bottom: frame.height,
                                           right: 0.0)
  }

  @objc func keyboardWillHide(notif: Notification) {
    scrollView.contentInset = UIEdgeInsets()
  }
}

// MARK: - Status Bar Style

extension TextFieldManualLayoutLegacySwiftExample {
  override var preferredStatusBarStyle: UIStatusBarStyle {
    return .lightContent
  }
}

// MARK: - CatalogByConvention
extension TextFieldManualLayoutLegacySwiftExample {
  @objc class func catalogBreadcrumbs() -> [String] {
    return ["Text Field", "[Legacy] Manual Layout (Swift)"]
  }

  @objc class func catalogIsPrimaryDemo() -> Bool {
    return false
  }
}