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<?php

namespace Drupal\user\Form;

use Drupal\Core\Entity\EntityManagerInterface;
use Drupal\Core\Form\ConfirmFormBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Messenger\MessengerInterface;
use Drupal\Core\Url;
use Drupal\Core\TempStore\PrivateTempStoreFactory;
use Drupal\user\UserStorageInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides a confirmation form for cancelling multiple user accounts.
 *
 * @internal
 */
class UserMultipleCancelConfirm extends ConfirmFormBase {

  /**
   * The temp store factory.
   *
   * @var \Drupal\Core\TempStore\PrivateTempStoreFactory
   */
  protected $tempStoreFactory;

  /**
   * The user storage.
   *
   * @var \Drupal\user\UserStorageInterface
   */
  protected $userStorage;

  /**
   * The entity manager.
   *
   * @var \Drupal\Core\Entity\EntityManagerInterface
   */
  protected $entityManager;

  /**
   * Constructs a new UserMultipleCancelConfirm.
   *
   * @param \Drupal\Core\TempStore\PrivateTempStoreFactory $temp_store_factory
   *   The temp store factory.
   * @param \Drupal\user\UserStorageInterface $user_storage
   *   The user storage.
   * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
   *   The entity manager.
   */
  public function __construct(PrivateTempStoreFactory $temp_store_factory, UserStorageInterface $user_storage, EntityManagerInterface $entity_manager) {
    $this->tempStoreFactory = $temp_store_factory;
    $this->userStorage = $user_storage;
    $this->entityManager = $entity_manager;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static(
      $container->get('tempstore.private'),
      $container->get('entity.manager')->getStorage('user'),
      $container->get('entity.manager')
    );
  }

  /**
   * {@inheritdoc}
   */
  public function getFormId() {
    return 'user_multiple_cancel_confirm';
  }

  /**
   * {@inheritdoc}
   */
  public function getQuestion() {
    return $this->t('Are you sure you want to cancel these user accounts?');
  }

  /**
   * {@inheritdoc}
   */
  public function getCancelUrl() {
    return new Url('entity.user.collection');
  }

  /**
   * {@inheritdoc}
   */
  public function getConfirmText() {
    return $this->t('Cancel accounts');
  }

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {
    // Retrieve the accounts to be canceled from the temp store.
    /* @var \Drupal\user\Entity\User[] $accounts */
    $accounts = $this->tempStoreFactory
      ->get('user_user_operations_cancel')
      ->get($this->currentUser()->id());
    if (!$accounts) {
      return $this->redirect('entity.user.collection');
    }

    $root = NULL;
    $names = [];
    $form['accounts'] = ['#tree' => TRUE];
    foreach ($accounts as $account) {
      $uid = $account->id();
      $names[$uid] = $account->label();
      // Prevent user 1 from being canceled.
      if ($uid <= 1) {
        $root = intval($uid) === 1 ? $account : $root;
        continue;
      }
      $form['accounts'][$uid] = [
        '#type' => 'hidden',
        '#value' => $uid,
      ];
    }

    $form['account']['names'] = [
      '#theme' => 'item_list',
      '#items' => $names,
    ];

    // Output a notice that user 1 cannot be canceled.
    if (isset($root)) {
      $redirect = (count($accounts) == 1);
      $message = $this->t('The user account %name cannot be canceled.', ['%name' => $root->label()]);
      $this->messenger()->addMessage($message, $redirect ? MessengerInterface::TYPE_ERROR : MessengerInterface::TYPE_WARNING);
      // If only user 1 was selected, redirect to the overview.
      if ($redirect) {
        return $this->redirect('entity.user.collection');
      }
    }

    $form['operation'] = ['#type' => 'hidden', '#value' => 'cancel'];

    // Display account cancellation method selection, if allowed.
    $user = $this->currentUser();
    $selectCancel = $user->hasPermission('administer users') || $user->hasPermission('select account cancellation method');

    $form['user_cancel_method'] = [
      '#type' => 'radios',
      '#title' => $this->t('When cancelling these accounts'),
      '#access' => $selectCancel,
    ];

    $form['user_cancel_method'] += user_cancel_methods();

    if (!$selectCancel) {
      // Display an item to inform the user of the setting.
      $default_method = $form['user_cancel_method']['#default_value'];
      $form['user_cancel_method_show'] = [
        '#type' => 'item',
        '#title' => $this->t('When cancelling these accounts'),
        '#plain_text' => $form['user_cancel_method']['#options'][$default_method],
      ];
    }

    // Allow to send the account cancellation confirmation mail.
    $form['user_cancel_confirm'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Require email confirmation to cancel account'),
      '#default_value' => FALSE,
      '#description' => $this->t('When enabled, the user must confirm the account cancellation via email.'),
    ];
    // Also allow to send account canceled notification mail, if enabled.
    $form['user_cancel_notify'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Notify user when account is canceled'),
      '#default_value' => FALSE,
      '#access' => $this->config('user.settings')->get('notify.status_canceled'),
      '#description' => $this->t('When enabled, the user will receive an email notification after the account has been canceled.'),
    ];

    $form = parent::buildForm($form, $form_state);

    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    $current_user_id = $this->currentUser()->id();

    // Clear out the accounts from the temp store.
    $this->tempStoreFactory->get('user_user_operations_cancel')->delete($current_user_id);
    if ($form_state->getValue('confirm')) {
      foreach ($form_state->getValue('accounts') as $uid => $value) {
        // Prevent programmatic form submissions from cancelling user 1.
        if ($uid <= 1) {
          continue;
        }
        // Prevent user administrators from deleting themselves without confirmation.
        if ($uid == $current_user_id) {
          $admin_form_mock = [];
          $admin_form_state = $form_state;
          $admin_form_state->unsetValue('user_cancel_confirm');
          // The $user global is not a complete user entity, so load the full
          // entity.
          $account = $this->userStorage->load($uid);
          $admin_form = $this->entityManager->getFormObject('user', 'cancel');
          $admin_form->setEntity($account);
          // Calling this directly required to init form object with $account.
          $admin_form->buildForm($admin_form_mock, $admin_form_state);
          $admin_form->submitForm($admin_form_mock, $admin_form_state);
        }
        else {
          user_cancel($form_state->getValues(), $uid, $form_state->getValue('user_cancel_method'));
        }
      }
    }
    $form_state->setRedirect('entity.user.collection');
  }

}