ami.module

<?php
/**
 * @file
 * Contains ami.module.
 */

use Drupal\Core\Language\Language;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Url;
use Drupal\format_strawberryfield\Event\FormatStrawberryfieldFormAlterEvent;
use Drupal\format_strawberryfield\FormatStrawberryfieldEventType;

/**
 * Implements hook_help().
 */
function ami_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    case 'help.page.ami':
      $text = file_get_contents(dirname(__FILE__) . "/README.md");
      if (!\Drupal::moduleHandler()->moduleExists('markdown')) {
        return '<pre>' . $text . '</pre>';
      }
      else {
        // Use the Markdown filter to render the README.
        $filter_manager = \Drupal::service('plugin.manager.filter');
        $settings = \Drupal::configFactory()->get('markdown.settings')->getRawData();
        $config = ['settings' => $settings];
        $filter = $filter_manager->createInstance('markdown', $config);
        return $filter->process($text, 'en');
      }
  }
}

function ami_form_metadatadisplay_entity_edit_form_alter(&$form,FormStateInterface $form_state, $form_id) {

  // Add our AMI options here
  $form['preview']['entity_type'] = [
    '#type' => 'radios',
    '#weight' => -10,
    '#title' => t('Entity type'),
    '#description' => t('The Entity Type you want to preview.'),
    '#options' => [
      'ado' => t('Archipelago Digital Objects'),
      'ami' => t('AMI Sets'),
    ],
    '#default_value' => $form_state->getValue('entity_type', NULL) ?? 'ado'
  ];


  $form['preview']['ado_context_preview']['#states'] = [
      'visible' => [
        ':input[name="entity_type"]' => ['value' => 'ado'],
      ],
    ];

  $form['preview']['ado_amiset_preview'] = [
    '#type' => 'entity_autocomplete',
    '#weight' => -9,
    '#title' => t('Ami Set to preview'),
    '#description' => t('The AMI Set to be used to preview the data.'),
    '#target_type' => 'ami_set_entity',
    '#maxlength' => 1024,
    '#ajax' => [
      'callback' => '\Drupal\ami\Controller\AmiRowAutocompleteHandler::rowAjaxCallback',
      'event' => 'autocompleteclose change',
    ],
    '#states' => [
      'visible' => [':input[name="entity_type"]' => ['value' => 'ami']],
    ],
  ];

  $form['preview']['ado_amiset_row_context_preview'] = [
    '#type' => 'textfield',
    '#weight' => -8,
    '#title' => t('Row to preview'),
    '#states' => [
      'visible' => [
        'input[name="entity_type"]' => ['value' => 'ami'],
        'input[name="ado_amiset_preview"' => ['filled' => true],
      ],
    ],
  ];
  $ami_set = $form_state->getValue('ado_amiset_preview', NULL);
  if (is_scalar($ami_set)) {
    $form['preview']['ado_amiset_row_context_preview']['#autocomplete_route_name'] = 'ami.rowsbylabel.autocomplete';
    $form['preview']['ado_amiset_row_context_preview']['#autocomplete_route_parameters'] = [
      'ami_set_entity' => $ami_set
    ];
  }

  $form['preview']['button_preview'][
    '#states'] = [
      'visible' => [
        'input[name="ado_context_preview"' => ['filled' => true],
        'input[name="entity_type"]' => ['value' => 'ado'],
      ],
    ];

  $form['preview']['button_preview_amiset'] = [
    '#type' => 'button',
    '#op' => 'preview',
    '#weight' => -7,
    '#value' => t('Show preview for AMI Set'),
    '#ajax' => [
      'callback' => '\Drupal\ami\Controller\AmiRowAutocompleteHandler::ajaxPreviewAmiSet',
    ],
    '#states' => [
      'visible' => [
        'input[name="ado_amiset_preview"' => ['filled' => true],
        'input[name="entity_type"]' => ['value' => 'ami']
      ],
    ],
  ];

  $form['preview']['render_native'] = [
    '#type' => 'checkbox',
    '#weight' => 10,
    '#defaut_value' => FALSE,
    '#title' => 'Show Preview using native Output Format (e.g HTML)',
    '#states' => [
      'visible' => [
        ['input[name="ado_context_preview"' => ['filled' => true]],
        'or',
        ['input[name="ado_amiset_preview"' => ['filled' => true],
          'input[name="ado_amiset_row_context_preview"' => ['filled' => true]]
      ],
    ],
  ];

  return $form;
}