/*

 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 Contacts tab. Creates

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

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

  didSelect contacts: [CNContact]) to allow users to select and return one or

  more contacts.

 */

import UIKit

import ContactsUI

class SelectMultipleContacts: BaseViewController {

    // MARK: - Display Picker

    /**

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

        Multiple Contacts tab. Select one or more contacts in the picker

        to continue.

    */

    @IBAction func showPicker(_ sender: UIButton) {

        // Hide the stackview and remove everything from the table view.

        hideStackView(true)

        let picker = CNContactPickerViewController()

        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.value

    }

}

/**

    Extends `SelectMultipleContacts` to conform to the `CNContactPickerDelegate`

    protocol.

*/

extension SelectMultipleContacts: CNContactPickerDelegate {

    /**

        Called when users tap one or more contacts in the picker, then Done in

        the picker view. Calls hideStackView(_:) to update the table view with

        the full names of the selected contacts.

    */

    func contactPicker(_ picker: CNContactPickerViewController, didSelect contacts: [CNContact]) {

        if !contacts.isEmpty {

            var section = [LabelValue]()

            // Iterate through all the selected contacts.

            for contact in contacts {

                let item = LabelValue(value: contact.formattedName)

                section.append(item)

            }

            data = [Section(section: section)]

            // Show and update the table view with the above contacts.

            hideStackView(false)

        }

    }

}