<?php

/**
 * @file
 * Provides example webforms for reviewing and testing accessibility.
 */

use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Url;
use Drupal\webform\Utility\WebformArrayHelper;

/**
 * Implements hook_page_attachments().
 */
function webform_examples_accessibility_page_attachments(array &$attachments) {
  // Attach accessibility library which shows all fieldsets and labels.
  if (\Drupal::request()->query->get('accessibility') === '1') {
    $attachments['#attached']['library'][] = 'webform_examples_accessibility/webform_examples_accessibility';
  }
}

/**
 * Implements hook_webform_submission_form_alter().
 *
 * Adds button to disable/enable HTML client-side validation without have
 * to change any webform settings.
 *
 * The link is only applicable to webform ids that are prefix with examples_accessibility_*.
 */
function webform_examples_accessibility_webform_submission_form_alter(array &$form, FormStateInterface $form_state, $form_id) {
  if (strpos($form['#webform_id'], 'example_accessibility_') !== 0
    && !preg_match('/^issue_\d+$/', $form['#webform_id'])
    && strpos($form['#webform_id'], 'test_') !== 0) {
    return;
  }

  $form['accessibility'] = [
    '#suffix' => '<hr/>',
    '#weight' => -1000,
  ];

  /* ************************************************************************ */
  // Accessibility.
  /* ************************************************************************ */

  // Get query without ajax parameters.
  $query = \Drupal::request()->query->all();
  unset($query['ajax_form'], $query['_wrapper_format']);

  $accessibility = (\Drupal::request()->query->get('accessibility') === '1') ? TRUE : FALSE;

  $form['accessibility']['accessibility'] = [
    '#type' => 'link',
    '#title' => $accessibility ? t('Hide accessibility') : t('Show accessibility'),
    '#url' => Url::fromRoute('<current>', [], ['query' => ['accessibility' => $accessibility ? 0 : 1] + $query]),
  ];

  /* ************************************************************************ */
  // Required.
  /* ************************************************************************ */

  $form['accessibility'][] = ['#markup' => ' | '];

  if (\Drupal::request()->query->get('required') === '1') {
    $required = TRUE;
  }
  elseif (\Drupal::request()->query->get('required') === '0') {
    $required = FALSE;
  }
  else {
    $required = NULL;
  }

  $form['accessibility']['required'] = [
    '#type' => 'link',
    '#title' => $required ? t('Disable required') : t('Enable required'),
    '#url' => Url::fromRoute('<current>', [], ['query' => ['required' => $required ? 0 : 1] + $query]),
  ];

  if ($required !== NULL) {
    $elements = &WebformArrayHelper::flattenAssoc($form);
    foreach ($elements as &$element) {
      if (is_array($element) && isset($element['#type'])) {
        $element['#required'] = $required;
      }
    }
  }

  /* ************************************************************************ */
  // No validate.
  /* ************************************************************************ */

  $form['accessibility'][] = ['#markup' => ' | '];

  if (\Drupal::request()->query->get('novalidate') === '1') {
    $form['#attributes']['novalidate'] = TRUE;
    $novalidate = TRUE;
  }
  else {
    unset($form['#attributes']['novalidate']);
    $novalidate = FALSE;
  }

  $form['accessibility']['novalidate'] = [
    '#type' => 'link',
    '#title' => $novalidate ? t('Enable client-side validation') : t('Disable client-side validation'),
    '#url' => Url::fromRoute('<current>', [], ['query' => ['novalidate' => $novalidate ? 0 : 1] + $query]),
  ];

  /* ************************************************************************ */
  // Inline form error.
  /* ************************************************************************ */

  if (\Drupal::moduleHandler()->moduleExists('inline_form_errors')) {
    $form['accessibility'][] = ['#markup' => ' | '];

    if (\Drupal::request()->query->get('disable_inline_form_errors') === '1') {
      $form['#disable_inline_form_errors'] = TRUE;
      $disable_inline_form_errors = TRUE;
    }
    else {
      unset($form['#disable_inline_form_errors']);
      $disable_inline_form_errors = FALSE;
    }

    $form['accessibility']['disable_inline_form_errors'] = [
      '#type' => 'link',
      '#title' => $disable_inline_form_errors ? t('Enable inline form errors') : t('Disable inline form errors'),
      '#url' => Url::fromRoute('<current>', [], ['query' => ['disable_inline_form_errors' => $disable_inline_form_errors ? 0 : 1] + $query]),
    ];
  }
}
