<?php

/**
 * @file
 * Primary hook implementations for Schema.org Metatag.
 */

/**
 * Implements hook_ctools_plugin_api().
 */
function schema_metatag_ctools_plugin_api($owner, $api) {
  if ($owner == 'metatag' && $api == 'metatag') {
    return array('version' => 1);
  }
}

/**
 * Implements hook_html_head_alter().
 */
function schema_metatag_html_head_alter(&$elements) {

  // Parse tags added by Schema Metatag into a structured data array.
  $items = SchemaMetatagManager::parseJsonld($elements);

  // Turn the structured data array into JSON LD and add it to page head.
  if (count($items) > 0) {
    // Json_encode the results.
    $jsonld = SchemaMetatagManager::encodeJsonld($items);
    if (!empty($jsonld)) {
      // Add the render array to the page head elements.
      $elements['schema_metatag'] = SchemaMetatagManager::renderArrayJsonLd($jsonld);
    }
  }
}

/**
 * Validation callback for a schema_metatag element to serialize nested arrays.
 */
function schema_metatag_element_validate($element, &$form_state, $form) {
  // For values that are not string values but instead nested arrays,
  // serialize the results into a single string value.
  $keys = $element['#array_parents'];
  if (count($keys) >= 4) {
    if (isset($form_state['values'][$keys[0]][$keys[1]][$keys[3]][$keys[4]])) {
      $value = $form_state['values'][$keys[0]][$keys[1]][$keys[3]][$keys[4]];
      if (is_array($value)) {
        $value = SchemaMetatagManager::serialize($value);
        form_set_value($element, $value, $form_state);
      }
    }
  }
}