/*

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

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 A BaseViewController subclass that implements the Multiple Properties tab. Creates

  and presents a contact picker view controller when tapping "Show Picker" in the

  UI. Use CNContactPickerDelegate's contactPicker(_ picker: CNContactPickerViewController,

  didSelectContactProperties contactProperties: [CNContactProperty]) to allow

  users to select one or more properties from a contact detail card. Also use

  CNContactPickerViewController's predicateForSelectionOfProperty instance

  property to specify which contact property to select in the contact detail card.

 */

import UIKit

import ContactsUI

class SelectMultipleProperties: BaseViewController {

    // MARK: - Display Picker

    @IBAction func showPicker(_ sender: UIButton) {

        hideStackView(true)

        let picker = CNContactPickerViewController()

        //Select contacts' email addresses.

        picker.predicateForSelectionOfProperty = NSPredicate(format: "key == 'emailAddresses'")

        picker.delegate = self

        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 `SelectMultipleProperties` to conform to the `CNContactPickerDelegate`

    protocol.

*/

extension SelectMultipleProperties: CNContactPickerDelegate {

    func contactPicker(_ picker: CNContactPickerViewController, didSelectContactProperties contactProperties: [CNContactProperty]) {

        // Iterate through all properties if contactProperties is not empty.

        if !contactProperties.isEmpty {

            for property in contactProperties {

                var section = [LabelValue]()

                // Attempt to fetch the contact property key name.

                if let name = property.nameMatchingKey {

                    let formattedName = property.contact.formattedName

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

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

                }

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

                if let localizedLabel = property.nameMatchingLocalizedLabel {

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

                }

                // Attempt to fetch the value of the property.

                if let value = property.nameMatchingValue {

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

                }

                if !section.isEmpty {

                    data.append(Section(section: section))

                }

            }

            hideStackView(false)

        }

    }

}