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<?php

namespace Drupal\webform\Plugin\WebformElement;

use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Mail\MailFormatHelper;
use Drupal\webform\Element\WebformComputedBase as WebformComputedBaseElement;
use Drupal\webform\Element\WebformComputedTwig as WebformComputedTwigElement;
use Drupal\webform\Element\WebformMessage as WebformMessageElement;
use Drupal\webform\Plugin\WebformElementBase;
use Drupal\webform\Plugin\WebformElementComputedInterface;
use Drupal\webform\Plugin\WebformElementDisplayOnInterface;
use Drupal\webform\WebformInterface;
use Drupal\webform\WebformSubmissionInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides a base class for 'webform_computed' elements.
 */
abstract class WebformComputedBase extends WebformElementBase implements WebformElementDisplayOnInterface, WebformElementComputedInterface {

  use WebformDisplayOnTrait;

  /**
   * The database connection.
   *
   * @var \Drupal\Core\Database\Connection
   */
  protected $database;

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    $instance = parent::create($container, $configuration, $plugin_id, $plugin_definition);
    $instance->database = $container->get('database');
    return $instance;
  }

  /**
   * {@inheritdoc}
   */
  protected function defineDefaultProperties() {
    return [
      // Element settings.
      'title' => '',
      // Markup settings.
      'display_on' => WebformElementDisplayOnInterface::DISPLAY_ON_BOTH,
      // Description/Help.
      'help' => '',
      'help_title' => '',
      'description' => '',
      'more' => '',
      'more_title' => '',
      // Form display.
      'title_display' => '',
      'description_display' => '',
      // Computed values.
      'template' => '',
      'mode' => WebformComputedBaseElement::MODE_AUTO,
      'hide_empty' => FALSE,
      'store' => FALSE,
      'ajax' => FALSE,
      // Attributes.
      'attributes' => [],
      'wrapper_attributes' => [],
      'label_attributes' => [],
    ] + $this->defineDefaultBaseProperties();
  }

  /* ************************************************************************ */

  /**
   * {@inheritdoc}
   */
  public function isInput(array $element) {
    // Set to TRUE so that the computed value can be exported.
    return TRUE;
  }

  /**
   * {@inheritdoc}
   */
  public function isContainer(array $element) {
    return FALSE;
  }

  /**
   * {@inheritdoc}
   */
  public function prepare(array &$element, ?WebformSubmissionInterface $webform_submission = NULL) {
    parent::prepare($element, $webform_submission);

    // Hide element if it should not be displayed on 'form'.
    if (!$this->isDisplayOn($element, WebformElementDisplayOnInterface::DISPLAY_ON_FORM)) {
      $element['#access'] = FALSE;
    }
  }

  /**
   * {@inheritdoc}
   */
  protected function prepareElementValidateCallbacks(array &$element, ?WebformSubmissionInterface $webform_submission = NULL) {
    parent::prepareElementValidateCallbacks($element, $webform_submission);
    $element['#element_validate'][] = [get_class($this), 'validateWebformComputed'];
  }

  /**
   * {@inheritdoc}
   */
  public function formatTableColumn(array $element, WebformSubmissionInterface $webform_submission, array $options = []) {
    return ['#markup' => $this->formatHtml($element, $webform_submission)];
  }

  /**
   * {@inheritdoc}
   */
  public function getValue(array $element, WebformSubmissionInterface $webform_submission, array $options = []) {
    // Get stored value if it is set.
    $value = $webform_submission->getElementData($element['#webform_key']);
    if (isset($value)) {
      return $value;
    }

    return $this->computeValue($element, $webform_submission);
  }

  /**
   * {@inheritdoc}
   */
  protected function formatHtmlItem(array $element, WebformSubmissionInterface $webform_submission, array $options = []) {
    $value = $this->getValue($element, $webform_submission);
    if ($this->getMode($element) === WebformComputedBaseElement::MODE_TEXT) {
      return nl2br($value);
    }
    else {
      return $value;
    }
  }

  /**
   * {@inheritdoc}
   */
  protected function formatTextItem(array $element, WebformSubmissionInterface $webform_submission, array $options = []) {
    $value = $this->getValue($element, $webform_submission);
    if ($this->getMode($element) === WebformComputedBaseElement::MODE_HTML) {
      return MailFormatHelper::htmlToText($value);
    }
    else {
      return $value;
    }
  }

  /**
   * {@inheritdoc}
   */
  public function getRelatedTypes(array $element) {
    return [];
  }

  /**
   * {@inheritdoc}
   */
  public function preview() {
    return [
      '#type' => $this->getTypeName(),
      '#title' => $this->getPluginLabel(),
      '#template' => $this->t('This is a @label value.', ['@label' => $this->getPluginLabel()]),
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function form(array $form, FormStateInterface $form_state) {
    $form = parent::form($form, $form_state);

    // Change the 'Element attributes' label to reflect that the hidden element
    // attributes are being defined.
    $form['element_attributes']['#title'] = $this->t('Hidden element attributes');

    $form['computed'] = [
      '#type' => 'fieldset',
      '#title' => $this->t('Computed settings'),
    ];
    $form['computed']['warning'] = [
      '#type' => 'webform_message',
      '#message_message' => $this->t('Computing complex or multiple values with or without Ajax can be resource intensive and may have performance implications. When possible try limiting or combining computations or consider using custom Twig functions, JavaScript, or PHP.'),
      '#message_type' => 'warning',
      '#message_close' => TRUE,
      '#message_storage' => WebformMessageElement::STORAGE_SESSION,
      '#access' => TRUE,
    ];
    $form['computed']['display_on'] = [
      '#type' => 'select',
      '#title' => $this->t('Display on'),
      '#options' => $this->getDisplayOnOptions(TRUE),
    ];
    $form['computed']['display_on_message'] = [
      '#type' => 'webform_message',
      '#message_message' => $this->t("This computed element's value will only be available as a token or exported value."),
      '#message_type' => 'warning',
      '#access' => TRUE,
      '#states' => [
        'visible' => [':input[name="properties[display_on]"]' => ['value' => WebformElementDisplayOnInterface::DISPLAY_ON_NONE]],
      ],
    ];
    $form['computed']['mode'] = [
      '#type' => 'select',
      '#title' => $this->t('Mode'),
      '#options' => [
        WebformComputedBaseElement::MODE_AUTO => $this->t('Auto-detect'),
        WebformComputedBaseElement::MODE_HTML => $this->t('HTML'),
        WebformComputedBaseElement::MODE_TEXT => $this->t('Plain text'),
      ],
    ];
    $form['computed']['template'] = [
      '#type' => 'webform_codemirror',
      '#mode' => 'text',
      '#title' => $this->t('Computed value/markup'),
    ];
    $form['computed']['whitespace'] = [
      '#type' => 'select',
      '#title' => $this->t('Remove whitespace around the'),
      '#empty_option' => $this->t('- None -'),
      '#options' => [
        WebformComputedTwigElement::WHITESPACE_TRIM => $this->t('computed value'),
        WebformComputedTwigElement::WHITESPACE_SPACELESS => $this->t('computed value and between HTML tags'),
      ],
    ];
    $form['computed']['hide_empty'] = [
      '#type' => 'checkbox',
      '#return_value' => TRUE,
      '#title' => $this->t('Hide empty'),
      '#description' => $this->t('If checked the computed elements will be hidden from display when the value is an empty string.'),
    ];
    $form['computed']['store'] = [
      '#type' => 'checkbox',
      '#return_value' => TRUE,
      '#title' => $this->t('Store value in the database'),
      '#description' => $this->t('The value will be stored in the database. As a result, it will only be recalculated when the submission is updated. This option is required when accessing the computed element through Views.'),
    ];
    $form['computed']['ajax'] = [
      '#type' => 'checkbox',
      '#return_value' => TRUE,
      '#title' => $this->t('Automatically update the computed value using Ajax'),
      '#description' => $this->t('If checked, any element used within the computed value/markup will trigger any automatic update.'),
    ];
    $form['computed']['tokens'] = ['#access' => TRUE, '#weight' => 10] + $this->tokenManager->buildTreeElement();
    return $form;
  }

  /**
   * Form API callback. Removes ignored element for $form_state values.
   */
  public static function validateWebformComputed(array &$element, FormStateInterface $form_state, array &$completed_form) {
    if (empty($element['#store'])) {
      // Unset the value from the $form_state to prevent modules from relying
      // on this value.
      $key = $element['#webform_key'];
      $form_state->unsetValue($key);
    }
  }

  /**
   * {@inheritdoc}
   */
  public function postSave(array &$element, WebformSubmissionInterface $webform_submission, $update = TRUE) {
    if ($update || empty($element['#store']) || $webform_submission->getWebform()->getSetting('results_disabled')) {
      return;
    }

    // Recalculate the stored computed value to account new a submission's
    // generated sid and serial.
    $key = $element['#webform_key'];
    $value = (string) $this->computeValue($element, $webform_submission);

    // Update the submission's value.
    $webform_submission->setElementData($key, $value);

    // The below database update is a one-off solution because there is
    // currently no other instances where a single element's value
    // needs to be updated.
    // @see \Drupal\webform\WebformSubmissionStorage::saveData
    $fields = [
      'webform_id' => $webform_submission->getWebform()->id(),
      'sid' => $webform_submission->id(),
      'name' => $key,
      'property' => '',
      'delta' => 0,
      'value' => $value,
    ];
    $this->database->update('webform_submission_data')
      ->fields($fields)
      ->condition('webform_id', $fields['webform_id'])
      ->condition('sid', $fields['sid'])
      ->condition('name', $fields['name'])
      ->execute();
  }

  /**
   * Get computed element markup.
   *
   * @param array $element
   *   An element.
   *
   * @return string
   *   The type of markup, HTML or plain-text.
   */
  protected function getMode(array $element) {
    $class = $this->getFormElementClassDefinition();
    return $class::getMode($element);
  }

  /**
   * {@inheritdoc}
   */
  public function computeValue(array $element, WebformSubmissionInterface $webform_submission) {
    $class = $this->getFormElementClassDefinition();
    return $class::computeValue($element, $webform_submission);
  }

  /**
   * {@inheritdoc}
   */
  public function getTestValues(array $element, WebformInterface $webform, array $options = []) {
    // Computed elements should never get a test value.
    return NULL;
  }

  /**
   * {@inheritdoc}
   */
  public function getElementSelectorInputValue($selector, $trigger, array $element, WebformSubmissionInterface $webform_submission) {
    return (string) $this->computeValue($element, $webform_submission);
  }

}