<?php
/**
 * @file
 * Main methods of Replicate paragraphs module.
 */

/**
 * Implements hook_replicate_entity_ENTITY_TYPE().
 */
function replicate_paragraphs_replicate_entity_paragraphs_item(&$entity) {
  $entity->item_id = NULL;
}

/**
 * Implements hook_replicate_field_FIELD_TYPE().
 */
function replicate_paragraphs_replicate_field_paragraphs(&$entity, $entity_type, $field_name) {
  foreach ($entity->$field_name as $language => $values) {
    replicate_paragraphs_clone_items($entity, $entity_type, $field_name, $language);
  }
}

/**
 * Implements hook_help().
 */
function replicate_paragraphs_help($path, $arg) {
  switch ($path) {
    case 'admin/help#replicate_paragraphs_item':
      // Return a line-break version of the module README.txt.
      return check_markup(file_get_contents(dirname(__FILE__) . "/README.txt"));
  }
}

/**
 * Replicate a paragraphs field.
 *
 * @param object $entity
 *   Entity to be modified.
 * @param string $entity_type
 *   Entity type.
 * @param string $field_name
 *   Name of the field.
 * @param string $language
 *   Language of the field.
 */
function replicate_paragraphs_clone_items(&$entity, $entity_type, $field_name, $language = LANGUAGE_NONE) {
  // Reset the field_language static.
  // If we don't, the language returned by field_language()
  // is FALSE, resulting in de metadata-wrapper (or field_get_items())
  // to get a FALSE / an empty array,
  // which means that the fields in it won't be cloned.
  drupal_static_reset('field_language');

  $entity_wrapper = entity_metadata_wrapper($entity_type, $entity);
  $old_items = $entity_wrapper->{$field_name}->value();
  if (is_null($old_items)) {
    $old_items = array();
  }
  elseif (!is_array($old_items)) {
    $old_items = array($old_items);
  }

  // Clean the previous entities from the field, so the new
  // can be saved instead.
  unset($entity->{$field_name}[$language]);

  foreach ($old_items as $old_item) {
    if (!empty($old_item)) {
      $new_item = replicate_clone_entity('paragraphs_item', $old_item);
      $new_item->setHostEntity($entity_type, $entity);
      // Don't save the new paragraphs,
      // it will be saved along with the host entity.
    }
  }
}