class TaxonomyIndexTid

class TaxonomyIndexTid extends ManyToOne {
  
  /**
   * Stores the exposed input for this filter.
   *
   * @var array|null
   */
  // phpcs:ignore Drupal.NamingConventions.ValidVariableName.LowerCamelName
  public $validated_exposed_input = NULL;
  
  /**
   * The vocabulary storage.
   *
   * @var \Drupal\taxonomy\VocabularyStorageInterface
   */
  protected $vocabularyStorage;
  
  /**
   * The term storage.
   *
   * @var \Drupal\taxonomy\TermStorageInterface
   */
  protected $termStorage;
  
  /**
   * The current user.
   *
   * @var \Drupal\Core\Session\AccountInterface
   */
  protected $currentUser;
  
  /**
   * Constructs a TaxonomyIndexTid object.
   *
   * @param array $configuration
   *   A configuration array containing information about the plugin instance.
   * @param string $plugin_id
   *   The plugin ID for the plugin instance.
   * @param mixed $plugin_definition
   *   The plugin implementation definition.
   * @param \Drupal\taxonomy\VocabularyStorageInterface $vocabulary_storage
   *   The vocabulary storage.
   * @param \Drupal\taxonomy\TermStorageInterface $term_storage
   *   The term storage.
   * @param \Drupal\Core\Session\AccountInterface $current_user
   *   The current user.
   */
  public function __construct(array $configuration, $plugin_id, $plugin_definition, VocabularyStorageInterface $vocabulary_storage, TermStorageInterface $term_storage, AccountInterface $current_user) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
    $this->vocabularyStorage = $vocabulary_storage;
    $this->termStorage = $term_storage;
    $this->currentUser = $current_user;
  }
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    return new static($configuration, $plugin_id, $plugin_definition, $container->get('entity_type.manager')
      ->getStorage('taxonomy_vocabulary'), $container->get('entity_type.manager')
      ->getStorage('taxonomy_term'), $container->get('current_user'));
  }
  
  /**
   * {@inheritdoc}
   */
  public function init(ViewExecutable $view, DisplayPluginBase $display, ?array &$options = NULL) {
    parent::init($view, $display, $options);
    if (!empty($this->definition['vocabulary'])) {
      $this->options['vid'] = $this->definition['vocabulary'];
    }
  }
  
  /**
   * {@inheritdoc}
   */
  public function hasExtraOptions() {
    return TRUE;
  }
  
  /**
   * {@inheritdoc}
   */
  public function getValueOptions() {
    return $this->valueOptions;
  }
  
  /**
   * {@inheritdoc}
   */
  protected function defineOptions() {
    $options = parent::defineOptions();
    $options['type'] = [
      'default' => 'textfield',
    ];
    $options['limit'] = [
      'default' => TRUE,
    ];
    $options['vid'] = [
      'default' => '',
    ];
    $options['hierarchy'] = [
      'default' => FALSE,
    ];
    $options['error_message'] = [
      'default' => TRUE,
    ];
    return $options;
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildExtraOptionsForm(&$form, FormStateInterface $form_state) {
    $vocabularies = $this->vocabularyStorage
      ->loadMultiple();
    $options = [];
    foreach ($vocabularies as $voc) {
      $options[$voc->id()] = $voc->label();
    }
    if ($this->options['limit']) {
      // We only do this when the form is displayed.
      if (empty($this->options['vid'])) {
        $first_vocabulary = reset($vocabularies);
        $this->options['vid'] = $first_vocabulary->id();
      }
      if (empty($this->definition['vocabulary'])) {
        $form['vid'] = [
          '#type' => 'radios',
          '#title' => $this->t('Vocabulary'),
          '#options' => $options,
          '#description' => $this->t('Select which vocabulary to show terms for in the regular options.'),
          '#default_value' => $this->options['vid'],
        ];
      }
    }
    $form['type'] = [
      '#type' => 'radios',
      '#title' => $this->t('Selection type'),
      '#options' => [
        'select' => $this->t('Dropdown'),
        'textfield' => $this->t('Autocomplete'),
      ],
      '#default_value' => $this->options['type'],
    ];
    $form['hierarchy'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Show hierarchy in dropdown'),
      '#default_value' => !empty($this->options['hierarchy']),
      '#states' => [
        'visible' => [
          ':input[name="options[type]"]' => [
            'value' => 'select',
          ],
        ],
      ],
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  protected function valueForm(&$form, FormStateInterface $form_state) {
    $vocabulary = $this->vocabularyStorage
      ->load($this->options['vid']);
    if (empty($vocabulary) && $this->options['limit']) {
      $form['markup'] = [
        '#markup' => '<div class="js-form-item form-item">' . $this->t('An invalid vocabulary is selected. Change it in the options.') . '</div>',
      ];
      return;
    }
    if ($this->options['type'] == 'textfield') {
      $terms = $this->value ? Term::loadMultiple($this->value) : [];
      $form['value'] = [
        '#title' => $this->options['limit'] ? $this->t('Select terms from vocabulary @voc', [
          '@voc' => $vocabulary->label(),
        ]) : $this->t('Select terms'),
        '#type' => 'textfield',
        '#default_value' => EntityAutocomplete::getEntityLabels($terms),
      ];
      if ($this->options['limit']) {
        $form['value']['#type'] = 'entity_autocomplete';
        $form['value']['#target_type'] = 'taxonomy_term';
        $form['value']['#selection_settings']['target_bundles'] = [
          $vocabulary->id(),
        ];
        $form['value']['#tags'] = TRUE;
        $form['value']['#process_default_value'] = FALSE;
      }
    }
    else {
      if (!empty($this->options['hierarchy']) && $this->options['limit']) {
        $tree = $this->termStorage
          ->loadTree($vocabulary->id(), 0, NULL, TRUE);
        $options = [];
        if ($tree) {
          foreach ($tree as $term) {
            if (!$term->isPublished() && !$this->currentUser
              ->hasPermission('administer taxonomy')) {
              continue;
            }
            $choice = new \stdClass();
            $choice->option = [
              $term->id() => str_repeat('-', $term->depth) . \Drupal::service('entity.repository')->getTranslationFromContext($term)
                ->label(),
            ];
            $options[] = $choice;
          }
        }
      }
      else {
        $options = [];
        $query = \Drupal::entityQuery('taxonomy_term')->accessCheck(TRUE)
          ->sort('weight')
          ->sort('name')
          ->addTag('taxonomy_term_access');
        if (!$this->currentUser
          ->hasPermission('administer taxonomy')) {
          $query->condition('status', 1);
        }
        if ($this->options['limit']) {
          $query->condition('vid', $vocabulary->id());
        }
        $terms = Term::loadMultiple($query->execute());
        foreach ($terms as $term) {
          $options[$term->id()] = \Drupal::service('entity.repository')->getTranslationFromContext($term)
            ->label();
        }
      }
      $default_value = (array) $this->value;
      if ($exposed = $form_state->get('exposed')) {
        $identifier = $this->options['expose']['identifier'];
        if (!empty($this->options['expose']['reduce'])) {
          $options = $this->reduceValueOptions($options);
          if (!empty($this->options['expose']['multiple']) && empty($this->options['expose']['required'])) {
            $default_value = [];
          }
        }
        if (empty($this->options['expose']['multiple'])) {
          if (empty($this->options['expose']['required']) && (empty($default_value) || !empty($this->options['expose']['reduce']))) {
            $default_value = 'All';
          }
          elseif (empty($default_value)) {
            $keys = array_keys($options);
            $default_value = array_shift($keys);
          }
          elseif ($default_value == [
            '',
          ]) {
            $default_value = 'All';
          }
          else {
            $copy = $default_value;
            $default_value = array_shift($copy);
          }
        }
      }
      $form['value'] = [
        '#type' => 'select',
        '#title' => $this->options['limit'] ? $this->t('Select terms from vocabulary @voc', [
          '@voc' => $vocabulary->label(),
        ]) : $this->t('Select terms'),
        '#multiple' => TRUE,
        '#options' => $options,
        '#size' => min(9, count($options)),
        '#default_value' => $default_value,
      ];
      $user_input = $form_state->getUserInput();
      if ($exposed && isset($identifier) && !isset($user_input[$identifier])) {
        $user_input[$identifier] = $default_value;
        $form_state->setUserInput($user_input);
      }
    }
    if (!$form_state->get('exposed')) {
      // Retain the helper option.
      $this->helper
        ->buildOptionsForm($form, $form_state);
      // Show help text if not exposed to end users.
      $form['value']['#description'] = $this->t('Leave blank for all. Otherwise, the first selected term will be the default instead of "Any".');
    }
  }
  
  /**
   * {@inheritdoc}
   */
  protected function valueValidate($form, FormStateInterface $form_state) {
    // We only validate if they've chosen the text field style.
    if ($this->options['type'] != 'textfield') {
      return;
    }
    $tids = [];
    if ($values = $form_state->getValue([
      'options',
      'value',
    ])) {
      foreach ($values as $value) {
        $tids[] = $value['target_id'];
      }
    }
    $form_state->setValue([
      'options',
      'value',
    ], $tids);
  }
  
  /**
   * {@inheritdoc}
   */
  public function acceptExposedInput($input) {
    if (empty($this->options['exposed'])) {
      return TRUE;
    }
    // We need to know the operator, which is normally set in
    // \Drupal\views\Plugin\views\filter\FilterPluginBase::acceptExposedInput(),
    // before we actually call the parent version of ourselves.
    if (!empty($this->options['expose']['use_operator']) && !empty($this->options['expose']['operator_id']) && isset($input[$this->options['expose']['operator_id']])) {
      $this->operator = $input[$this->options['expose']['operator_id']];
    }
    // If view is an attachment and is inheriting exposed filters, then assume
    // exposed input has already been validated.
    if (!empty($this->view->is_attachment) && $this->view->display_handler
      ->usesExposed()) {
      $this->validated_exposed_input = (array) $this->view->exposed_raw_input[$this->options['expose']['identifier']];
    }
    // If we're checking for EMPTY or NOT, we don't need any input, and we can
    // say that our input conditions are met by just having the right operator.
    if ($this->operator == 'empty' || $this->operator == 'not empty') {
      return TRUE;
    }
    // If it's non-required and there's no value don't bother filtering.
    if (!$this->options['expose']['required'] && empty($this->validated_exposed_input)) {
      return FALSE;
    }
    $rc = parent::acceptExposedInput($input);
    if ($rc) {
      // If we have previously validated input, override.
      if (isset($this->validated_exposed_input)) {
        $this->value = $this->validated_exposed_input;
      }
    }
    return $rc;
  }
  
  /**
   * {@inheritdoc}
   */
  public function validateExposed(&$form, FormStateInterface $form_state) {
    if (empty($this->options['exposed'])) {
      return;
    }
    $identifier = $this->options['expose']['identifier'];
    $input = $form_state->getValue($identifier);
    if ($this->options['is_grouped'] && isset($this->options['group_info']['group_items'][$input])) {
      $this->validated_exposed_input = $this->options['group_info']['group_items'][$input]['value'];
      return;
    }
    // We only validate if they've chosen the text field style.
    if ($this->options['type'] != 'textfield') {
      if ($form_state->getValue($identifier) != 'All') {
        $this->validated_exposed_input = (array) $form_state->getValue($identifier);
      }
      return;
    }
    if (empty($this->options['expose']['identifier'])) {
      return;
    }
    if ($values = $form_state->getValue($identifier)) {
      foreach ($values as $value) {
        $this->validated_exposed_input[] = $value['target_id'];
      }
    }
  }
  
  /**
   * {@inheritdoc}
   */
  protected function valueSubmit($form, FormStateInterface $form_state) {
    // Prevent array_filter from messing up our arrays in parent submit.
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildExposeForm(&$form, FormStateInterface $form_state) {
    parent::buildExposeForm($form, $form_state);
    if ($this->options['type'] != 'select') {
      unset($form['expose']['reduce']);
    }
    $form['error_message'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Display error message'),
      '#default_value' => !empty($this->options['error_message']),
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  public function adminSummary() {
    // Set up $this->valueOptions for the parent summary.
    $this->valueOptions = [];
    if ($this->value) {
      $this->value = array_filter($this->value);
      $terms = Term::loadMultiple($this->value);
      foreach ($terms as $term) {
        $this->valueOptions[$term->id()] = \Drupal::service('entity.repository')->getTranslationFromContext($term)
          ->label();
      }
    }
    return parent::adminSummary();
  }
  
  /**
   * {@inheritdoc}
   */
  public function calculateDependencies() {
    $dependencies = parent::calculateDependencies();
    $vocabulary = $this->vocabularyStorage
      ->load($this->options['vid']);
    $dependencies[$vocabulary->getConfigDependencyKey()][] = $vocabulary->getConfigDependencyName();
    foreach ($this->termStorage
      ->loadMultiple($this->options['value']) as $term) {
      $dependencies[$term->getConfigDependencyKey()][] = $term->getConfigDependencyName();
    }
    return $dependencies;
  }

}