arch-8.x-1.x-dev/modules/product/modules/downloadable/arch_downloadable_product.module

<?php
/**
 * @file
 * Downloadable product.
 */

use Drupal\arch_product\Entity\ProductTypeInterface;
use Drupal\Core\Entity\Entity\EntityFormDisplay;
use Drupal\Core\Entity\Entity\EntityViewDisplay;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\field\Entity\FieldConfig;
use Drupal\field\Entity\FieldStorageConfig;

/**
 * Implements hook_form_alter().
 */
function arch_downloadable_product_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  if (!in_array($form_id, ['product_type_add_form', 'product_type_edit_form'])) {
    return;
  }
  /** @var \Drupal\arch_product\Form\ProductTypeForm $form_object */
  $form_object = $form_state->getFormObject();
  /** @var \Drupal\arch_product\Entity\ProductType $product_type */
  $product_type = $form_object->getEntity();

  $form['downloadable'] = [
    '#type' => 'details',
    '#title' => t('Downloadable', [], ['context' => 'arch_downloadable_product']),
    '#group' => 'product_type_features',
    '#weight' => -90,
  ];

  $form['downloadable']['is_downloadable'] = [
    '#type' => 'checkbox',
    '#title' => t('Downloadable product', [], ['context' => 'arch_downloadable_product']),
    '#default_value' => $product_type->getThirdPartySetting('arch_downloadable_product', 'is_downloadable'),
  ];

  if (_arch_downloadable_product_type_has_file_data($product_type)) {
    $form['downloadable']['is_downloadable']['#disabled'] = TRUE;
    $form['downloadable']['is_downloadable']['#description'] = t('There are products with files in this type.', [], ['context' => 'arch_stock']);
  }

  $form['#entity_builders'][] = 'arch_downloadable_product_form_product_type_form_builder';
}

/**
 * Check if there is any product with files with given type.
 *
 * @param \Drupal\arch_product\Entity\ProductTypeInterface $product_type
 *   Product type.
 *
 * @return bool
 *   Return TRUE if any.
 */
function _arch_downloadable_product_type_has_file_data(ProductTypeInterface $product_type) {
  /** @var \Drupal\field\Entity\FieldConfig $file_field */
  $file_field = FieldConfig::load('product.' . $product_type->id() . '.product_file');
  if (empty($file_field)) {
    return FALSE;
  }

  $db = \Drupal::database();

  $select = $db->select('product__product_file', 'f');
  $select->condition('bundle', $product_type->id());
  $count = (int) $select->countQuery()->execute()->fetchField();
  return $count > 0;
}

/**
 * Entity builder for downloadable product type options.
 *
 * @see arch_downloadable_product_form_alter()
 */
function arch_downloadable_product_form_product_type_form_builder($entity_type, ProductTypeInterface $type, &$form, FormStateInterface $form_state) {
  if ($form_state->getValue('is_downloadable')) {
    $type->setThirdPartySetting('arch_downloadable_product', 'is_downloadable', TRUE);
  }
  else {
    $type->unsetThirdPartySetting('arch_downloadable_product', 'is_downloadable');
  }
}

/**
 * Implements hook_entity_insert().
 */
function arch_downloadable_product_entity_insert(EntityInterface $entity) {
  if (\Drupal::isConfigSyncing()) {
    // Do not change data while config import in progress.
    return;
  }

  if ($entity->getEntityTypeId() == 'product_type') {
    /** @var \Drupal\arch_product\Entity\ProductTypeInterface $entity */
    if ($entity->getThirdPartySetting('arch_downloadable_product', 'is_downloadable')) {
      _arch_downloadable_product_add_file_field($entity);
    }
  }
}

/**
 * Implements hook_entity_update().
 */
function arch_downloadable_product_entity_update(EntityInterface $entity) {
  if (\Drupal::isConfigSyncing()) {
    // Do not change data while config import in progress.
    return;
  }

  if ($entity->getEntityTypeId() == 'product_type') {
    /** @var \Drupal\arch_product\Entity\ProductTypeInterface $entity */
    if ($entity->getThirdPartySetting('arch_downloadable_product', 'is_downloadable')) {
      _arch_downloadable_product_add_file_field($entity);
    }
    else {
      _arch_downloadable_product_remove_file_field($entity);
    }
  }
  elseif ($entity->getEntityTypeId() == 'order') {
    /** @var \Drupal\arch_order\Entity\OrderInterface $entity */
    _arch_stock_handle_stock_change_on_order_update($entity);
  }
}

/**
 * Add file field to product type.
 *
 * @param \Drupal\arch_product\Entity\ProductTypeInterface $product_type
 *   Product type.
 *
 * @throws \Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException
 * @throws \Drupal\Component\Plugin\Exception\PluginNotFoundException
 * @throws \Drupal\Core\Entity\EntityStorageException
 */
function _arch_downloadable_product_add_file_field(ProductTypeInterface $product_type) {
  $definition = [
    'name' => 'product_file',
    'form_display' => [
      'type' => 'file_generic',
    ],
    'display' => [
      'default' => [
        'type' => 'arch_downloadable_product',
      ],
    ],
  ];
  // Add or remove the description field, as needed.
  $field_storage = FieldStorageConfig::loadByName('product', $definition['name']);
  if (!$field_storage) {
    $field_storage = FieldStorageConfig::create([
      'status' => TRUE,
      'dependencies' => [
        'module' => [
          'arch_product',
          'file',
        ],
      ],
      'id' => 'product.product_file',
      'field_name' => 'product_file',
      'entity_type' => 'product',
      'type' => 'file',
      'settings' => [
        'display_field' => FALSE,
        'display_default' => FALSE,
        'uri_scheme' => 'private',
        'target_type' => 'file',
      ],
      'module' => 'file',
      'locked' => FALSE,
      'cardinality' => -1,
      'translatable' => FALSE,
    ]);
    $field_storage->save();
  }
  $field = FieldConfig::loadByName('product', $product_type->id(), $definition['name']);
  if (empty($field)) {
    $field = FieldConfig::create([
      'label' => 'File',
      'field_storage' => $field_storage,
      'bundle' => $product_type->id(),
    ]);
    $field->save();

    $entity_form_display = \Drupal::entityTypeManager()->getStorage('entity_form_display')
      ->load('product.' . $product_type->id() . '.default');
    if (empty($entity_form_display)) {
      $entity_form_display = EntityFormDisplay::create([
        'targetEntityType' => 'product',
        'bundle' => $product_type->id(),
        'mode' => 'default',
        'status' => TRUE,
      ]);
    }

    // Assign widget settings for the 'default' form mode.
    $entity_form_display
      ->setComponent($definition['name'], $definition['form_display'])
      ->save();

    // The teaser view mode is created by the Standard profile and therefore
    // might not exist.
    $view_modes = \Drupal::service('entity_display.repository')->getViewModes('product');
    // Assign display settings for the 'default' and 'teaser' view modes.
    foreach ($definition['display'] as $view_mode => $config) {
      if (isset($view_modes[$view_mode]) || 'default' == $view_mode) {
        $entity_display = \Drupal::entityTypeManager()->getStorage('entity_view_display')
          ->load('product.' . $product_type->id() . '.' . $view_mode);
        if (!$entity_display) {
          $entity_display = EntityViewDisplay::create([
            'targetEntityType' => 'product',
            'bundle' => $product_type->id(),
            'mode' => $view_mode,
            'status' => TRUE,
          ]);
        }
        $entity_display
          ->setComponent($definition['name'], $definition['display'][$view_mode])
          ->save();
      }
    }
  }
}

/**
 * Remove file field from product type.
 *
 * @param \Drupal\arch_product\Entity\ProductTypeInterface $product_type
 *   Product type.
 *
 * @throws \Drupal\Core\Entity\EntityStorageException
 */
function _arch_downloadable_product_remove_file_field(ProductTypeInterface $product_type) {
  $field = FieldConfig::loadByName('product', $product_type->id(), 'product_file');
  if ($field) {
    $field->delete();
  }
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function arch_downloadable_product_form_field_config_edit_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  $form['actions']['delete']['#access'] = FALSE;
}