<?php
/**
 * @file
 * Code for the Commons Topics feature.
 */

/**
* Implements hook_system_info_alter().
*/
function commons_topics_system_info_alter(&$info, $file, $type) {
  // Commons Topics dynamically adds field_topics to content types that implement
  // commons_topics_field. We must add a corresponding line for each field
  // instance to commons_topics.info so that Features is aware of the instance
  // and can sucessfully revert the field_instance component back to its
  // default state.
  if ($file->name == 'commons_topics') {
    $commons_topics_entity_types = commons_topics_get_entity_types_with_topics();
    if (!empty($commons_topics_entity_types)) {
      foreach ($commons_topics_entity_types as $entity_type => $bundles) {
        foreach(array_keys($bundles) as $bundle) {
          $info['features']['field_instance'][] = "$entity_type-$bundle-field_topics";
        }
      }
    }
  }
}

/**
 * Implements hook_form_FORM_ID_alter();
 */
function commons_topics_form_node_form_alter(&$form, &$form_state) {
  if (isset($form['field_topics'])) {
    $form['topics_wrapper'] = array(
      '#type' => 'fieldset',
      '#title' => t('Topics'),
      '#collapsible' => TRUE,
      '#collapsed' => FALSE,
      '#group' => 'additional_settings',
      '#weight' => -15,
    );
    $form['topics_wrapper']['field_topics'] = $form['field_topics'];
    $form['field_topics'] = array('#language' => NULL);
    $form['#attached']['js'] = array(
      drupal_get_path('module', 'commons_topics') . '/js/commons_topics.js',
    );
  }
}

/**
 * Returns an array of entity types that are enabled via Commons.
 */
function commons_topics_get_entity_types_with_topics() {
  // Find all Commons Entity integrations.
  $commons_entity_integrations = commons_entity_integration_info();
  if (empty($commons_entity_integrations)) {
    return array();
  }

  foreach ($commons_entity_integrations as $entity_type => $integration) {
    foreach ($integration as $bundle => $options) {
      if (isset($options['exclude_topics']) && $options['exclude_topics'] == TRUE) {
        unset($commons_entity_integrations[$entity_type][$bundle]);
      }
    }
    // If an entity type has no integrations, don't return it.
    if (empty($commons_entity_integrations[$entity_type])) {
      unset($commons_entity_integrations[$entity_type]);
    }
  }

  return $commons_entity_integrations;
}

/**
 * Implements hook_features_pipe_alter().
 */
function commons_topics_features_pipe_alter(&$pipe, $data, $export) {
  if (!empty($pipe['field_instance'])) {
    foreach ($pipe['field_instance'] as $delta => $value) {
      $args = explode('-', $value);
      $field_name = $args[2];
      if ($field_name == 'field_topics') {
        unset($pipe['field_instance'][$delta]);
      }
    }
  }
}