/*

 Copyright (C) 2017 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 A BaseViewController subclass that implements the Single Property tab. Creates

  a contact picker view controller, sets its displayedPropertyKeys

  property to only display the following properties in a contact detail card:

  givenName, familyName, emailAddresses, phoneNumbers, and postalAddresses, then

  presents it. Uses CNContactPickerDelegate's contactPicker(_ picker: CNContactPickerViewController,

  didSelect contactProperty: CNContactProperty) to allow users to select and

  return a single property.

*/

import UIKit

import ContactsUI

class SelectSingleProperty: BaseViewController {

    // MARK: - Display Picker

    /**

        Presents a contacts picker view when users tap "Show Picker" in the

        Single Property tab. Select a contact in the picker, then one of its

        properties to continue.

    */

    @IBAction func showPicker(_ sender: UIButton) {

        hideStackView(true)

        let picker = CNContactPickerViewController()

        picker.delegate = self

        picker.displayedPropertyKeys = [CNContactGivenNameKey, CNContactFamilyNameKey, CNContactEmailAddressesKey,

                                        CNContactPhoneNumbersKey, CNContactPostalAddressesKey]

        // Presents the contact picker view controller.

        present(picker, animated: true, completion: nil)

    }

    // MARK: - UITableViewDelegate

    func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {

        let  section = data[indexPath.section].section

        let item = section[indexPath.row]

        cell.textLabel?.text = item.label

        cell.detailTextLabel?.text = item.value

    }

}

/**

    Extends `SelectSingleProperty` to conform to the `CNContactPickerDelegate`

    protocol.

*/

extension SelectSingleProperty: CNContactPickerDelegate {

    /**

        Called when users tap a single property in the contact detail card.

        Calls hideStackView(_:) to update the table view with the name, value,

        and property key of the selected property and also with its associated

        contact's full name.

    */

    func contactPicker(_ picker: CNContactPickerViewController, didSelect contactProperty: CNContactProperty) {

        var section = [LabelValue]()

        // Attempt to fetch the contact property key name.

        if let name = contactProperty.nameMatchingKey {

            section = [LabelValue(label: AppConfiguration.TableViewCellLabels.contact, value: contactProperty.contact.formattedName),

                       LabelValue(label: AppConfiguration.TableViewCellLabels.key, value: name)]

        }

        // Attempt to fetch the localized label of the property.

        if let localizedLabel = contactProperty.nameMatchingLocalizedLabel {

            section.append(LabelValue(label: AppConfiguration.TableViewCellLabels.label, value: localizedLabel))

        }

        // Attempt to fetch the value of the property.

        if let value = contactProperty.nameMatchingValue {

            section.append(LabelValue(label: AppConfiguration.TableViewCellLabels.value, value: value))

        }

        data = [Section(section: section)]

        // Show and update the table view with the above property information.

        hideStackView(false)

    }

}