<?php

/**
 * @file
 * Provides synonyms from entity fields.
 */

/**
 * Implements hook_field_delete_instance().
 */
function synonyms_provider_field_field_delete_instance($instance) {
  // Remove, if necessary, any synonyms behaviors enabled on this instance.
  foreach (synonyms_behavior_get_all_enabled($instance['entity_type'], $instance['bundle'], synonyms_provider_field_provider_name(field_info_field($instance['field_name']))) as $behavior_implementation) {
    synonyms_behavior_implementation_delete($behavior_implementation);
  }
}

/**
 * Implements hook_synonyms_provider_info().
 */
function synonyms_provider_field_synonyms_behavior_implementation_info($entity_type, $bundle, $behavior) {
  $providers = array();

  // Proxy the request down to any module that ships a synonyms behavior
  // implementation based on a field.
  $field_providers = module_invoke_all('synonyms_provider_field_behavior_implementation_info', $behavior);
  drupal_alter('synonyms_provider_field_behavior_implementation_info', $field_providers, $behavior);

  $instances = field_info_instances($entity_type, $bundle);

  foreach ($instances as $instance) {
    $field = field_info_field($instance['field_name']);
    if (isset($field_providers[$field['type']])) {
      $providers[] = array(
        'provider' => synonyms_provider_field_provider_name($field),
        'label' => $instance['label'],
        'class' => $field_providers[$field['type']],
      );
    }
  }

  return $providers;
}

/**
 * Implements hook_synonyms_provider_field_behavior_implementation_info().
 */
function synonyms_provider_field_synonyms_provider_field_behavior_implementation_info($behavior) {
  switch ($behavior) {
    case 'autocomplete':
    case 'select':
      return array(
        'number_integer' => 'TextSynonymsBehavior',
        'number_decimal' => 'TextSynonymsBehavior',
        'number_float' => 'TextSynonymsBehavior',
        'text' => 'TextSynonymsBehavior',
        'taxonomy_term_reference' => 'TaxonomySynonymsBehavior',
        'entityreference' => 'EntityReferenceSynonymsBehavior',
      );
      break;
  }
  return array();
}

/**
 * Construct synonyms provider name out of underlying field.
 *
 * This function is inverse of synonyms_provider_field_field_name().
 *
 * @param array $field
 *   Field definition array whose provider name should be constructed
 *
 * @return string
 *   Provider name that corresponds to the $field
 *
 * @see synonyms_provider_field_field_name()
 */
function synonyms_provider_field_provider_name($field) {
  return 'synonyms_provider_field_' . $field['field_name'];
}

/**
 * Reconstruct field name from the name of its provider.
 *
 * This function is inverse of synonyms_provider_field_provider_name().
 *
 * @param string $provider
 *   Name of the provider whose underlying field should be reconstructed
 *
 * @return string
 *   Field name that corresponds to the $provider
 *
 * @see synonyms_provider_field_provider_name()
 */
function synonyms_provider_field_field_name($provider) {
  return drupal_substr($provider, drupal_strlen('synonyms_provider_field_'));
}