roblib_alter_solr/src/Form/RoblibAlterSolrSettingsForm.php

<?php

declare(strict_types=1);

namespace Drupal\roblib_alter_solr\Form;

use Drupal\Core\Form\ConfigFormBase;
use Drupal\Core\Form\FormStateInterface;

/**
 * Configure Roblib Alter Solr settings for this site.
 */
final class RoblibAlterSolrSettingsForm extends ConfigFormBase {

  /**
   * {@inheritdoc}
   */
  public function getFormId(): string {
    return 'roblib_alter_solr_roblib_alter_solr_settings';
  }

  /**
   * {@inheritdoc}
   */
  protected function getEditableConfigNames(): array {
    return ['roblib_alter_solr.settings'];
  }

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {
    $config = $this->config('roblib_alter_solr.settings');
    $solr_config = $this->config('search_api.index.default_solr_index');
    $solr_fields = $solr_config->get('field_settings');
    $fields_options = [];
    foreach ($solr_fields as $name => $field) {
      $fields_options[$name] = $field['label'];
    }
    // Use getStorage() to persist state across AJAX calls.
    $pairs = $form_state->getStorage()['pairs'] ?? $form_state->get('pairs') ?? $config->get('pairs') ?? [];
    $form_state->setStorage(['pairs' => $pairs]);
    $form['open_modal'] = [
      '#type' => 'markup',
      '#markup' => '<a href="#" id="open-modal-link">' . $this->t('How to use this form') . '</a>',
      '#prefix' => '<div id="open_link-wrapper">',
      '#suffix' => '</div>',
    ];

    $form['pairs'] = [
      '#type' => 'table',
      '#header' => [
        $this->t('Source'),
        $this->t('Destination'),
        $this->t('Operations'),
      ],
      '#prefix' => '<div id="pairs-wrapper">',
      '#suffix' => '</div>',
    ];
    $added = FALSE;

    foreach ($pairs as $index => $pair) {
      $form['pairs'][$index]['source'] = [
        '#type' => 'select',
        '#multiple' => TRUE,
        '#options' => $fields_options,
        '#default_value' => $pair['source'] ?? '',
      ];

      $form['pairs'][$index]['destination'] = [
        '#type' => 'textfield',
        '#default_value' => $pair['destination'] ?? '',
      ];
      if ($pair['source'] && $pair['destination']) {
        $form['pairs'][$index]['remove'] = [
          '#type' => 'submit',
          '#value' => $this->t('Remove'),
          '#submit' => ['::removeCallback'],
          '#ajax' => [
            'callback' => '::ajaxCallback',
            'wrapper' => 'pairs-wrapper',
          ],
          '#name' => 'remove_' . $index,
          '#limit_validation_errors' => [],
        ];
      }
      else {
        $form['pairs'][$index]['add'] = [
          '#type' => 'submit',
          '#value' => $this->t('Add Row'),
          '#submit' => ['::addCallback'],
          '#ajax' => [
            'callback' => '::ajaxCallback',
            'wrapper' => 'pairs-wrapper',
          ],
        ];
        $form['pairs'][$index]['source']['#attributes'] = ['class' => ['source-field']];
        $form['pairs'][$index]['destination']['#attributes'] = ['class' => ['destination-field']];
        $added = TRUE;
      }

    }
    if (!$added) {
      $unique_id = uniqid();
      $pairs[$unique_id] = ['source' => '', 'destination' => ''];
      $form['pairs'][$unique_id]['source'] = [
        '#type' => 'select',
        '#multiple' => TRUE,
        '#options' => $fields_options,
        '#default_value' => '',
        '#attributes' => ['class' => ['source-field']],
      ];

      $form['pairs'][$unique_id]['destination'] = [
        '#type' => 'textfield',
        '#default_value' => '',
        '#attributes' => ['class' => ['destination-field']],
      ];
      $form['add'] = [
        '#type' => 'submit',
        '#value' => $this->t('Add Row'),
        '#submit' => ['::addCallback'],
        '#ajax' => [
          'callback' => '::ajaxCallback',
          'wrapper' => 'pairs-wrapper',
        ],
      ];

    }
    $form['#attached']['library'][] = 'roblib_alter_solr/roblib_alter_solr';

    return parent::buildForm($form, $form_state);
  }

  /**
   * Callback function to add a new row.
   */
  public function addCallback(array &$form, FormStateInterface $form_state) {
    $user_input = $form_state->getUserInput();
    $unique_id = uniqid();
    $pairs = $user_input['pairs'] ?? [];
    $pairs[$unique_id] = ['source' => '', 'destination' => ''];
    $form_state->set('pairs', $pairs);
    $form_state->setRebuild();
  }

  /**
   * Callback function to remove a row.
   */
  public function removeCallback(array &$form, FormStateInterface $form_state) {
    $trigger = $form_state->getTriggeringElement();
    $index = str_replace('remove_', '', $trigger['#name']);
    $pairs = $form_state->get('pairs') ?? [];

    if (isset($pairs[$index])) {
      unset($pairs[$index]);
      $form_state->set('pairs', $pairs);
    }

    $form_state->setRebuild();
  }

  /**
   * AJAX callback to update the form.
   */
  public function ajaxCallback(array &$form, FormStateInterface $form_state) {
    return $form['pairs'];
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    $pairs = $form_state->getValue('pairs');
    $config = $this->config('roblib_alter_solr.settings');
    $config->set('pairs', $pairs)->save();

    $this->messenger()->addStatus($this->t('Configuration saved successfully.'));
  }

  

}