<?php

/**
 * @file
 * User page callbacks for the ajax_facets module.
 */

/**
 * Callback to update facets content by AJAX.
 */
function ajax_facets_refresh_facets_content() {
  if (!empty($_POST['ajax_facets'])) {
    // Dirty hack to avoid error 414 in $_GET query.
    // @see class FacetapiUrlProcessorStandard->fetchParams();
    $_GET = array_merge($_GET, $_POST['ajax_facets']);

    // Reset $_POST, because html ids, can break ids of facets for update.
    unset($_POST['ajax_html_ids']);
    unset($_POST['ajax_facets']);

    $facet_query = !empty($_GET['f']) ? $_GET['f'] : '';
    $received_views = $_GET['views'];
    $processed_views = array();
    $views_settings = array(
      'views' => array(
        'ajax_path' => url('views/ajax', array('query' => array('f' => $facet_query))),
        'ajaxViews' => array()
      )
    );
    foreach ($received_views as $key => $received_view) {
      // Fix 'q' for paging.
      $view_path = isset($received_view['view_path']) ? rawurldecode($received_view['view_path']) : NULL;
      if (!empty($received_view['view_path'])) {
        $_GET['q'] = $received_view['view_path'];
      }

      // Execute view query to fill facets.
      $view = views_get_view($received_view['view_name']);
      // Check, do we need search results or not.
      if (isset($_GET['searchResultsNeeded'])) {
        if ($_GET['searchResultsNeeded'] == 'false') {
          // If we don't need search results, then we have to set limit as '0'.
          // It have to be string but not integer due the logic in search_api_views.
          $view->set_items_per_page('0');
        }
        unset($_GET['searchResultsNeeded']);
      }
      // Reuse dom id.
      $view->dom_id = isset($received_view['view_dom_id']) ? preg_replace('/[^a-zA-Z0-9_-]+/', '-', $received_view['view_dom_id']) : NULL;

      $view_args = isset($received_view['view_args']) && $received_view['view_args'] !== '' ? explode('/', $received_view['view_args']) : array();

      // Prepare data to update certain view.
      $processed_views[$key] = array(
        'view_name' => $received_view['view_name'],
        'view_display_id' => $received_view['view_display_id'],
        'view_dom_id' => $view->dom_id,
        'content' => $view->preview($received_view['view_display_id'], $view_args),
      );

      // @see template_preprocess_views_view();
      // Update settings when view will be reloaded. Specifically $view->dom_id.
      if ($view->use_ajax) {
        $views_settings['views']['ajaxViews']['views_dom_id:' . $view->dom_id] = array(
          'view_name' => $view->name,
          'view_display_id' => $view->current_display,
          'view_args' => check_plain(implode('/', $view->args)),
          'view_path' => $view_path,
          // Pass through URL to ensure we get e.g. language prefixes.
          'view_base_path' => $view->get_path(),
          'view_dom_id' => $view->dom_id,
          // To fit multiple views on a page, the programmer may have
          // overridden the display's pager_element.
          'pager_element' => isset($view->query->pager) ? $view->query->pager->get_pager_id() : 0,
        );
      }

      // Render exposed form separately if needed. @see https://www.drupal.org/node/2034029#comment-10211699
      if (!empty($view->display[$view->current_display]->display_options['exposed_block'])) {
        $exposed_form = $view->display_handler->get_plugin('exposed_form');
        $processed_views[$key]['exposed_form'] = $exposed_form->render_exposed_form(TRUE);
      }
    }


    $searcher = 'search_api@' . $_GET['index_id'];
    $blocks = ajax_facets_process_facet_blocks($searcher);

    $result = array(
      'resetUrls' => $blocks['reset_urls'],
      'newContent' => $blocks['facet_blocks'],
      'hideBlocks' => $blocks['hide_blocks'],
      'activeItems' => $blocks['active_items'],
      'views' => $processed_views,
      'facets' => $facet_query,
      'settings' => !empty($views_settings['views']['ajaxViews']) ? $views_settings : array(),
    );

    $commands = array();
    $commands[] = array(
      'command' => 'ajax_facets_update_content',
      'data' => $result,
    );

    // Allow other modules to add, change or delete commands.
    drupal_alter('ajax_facets_data', $commands, $view);
    drupal_add_http_header('Content-Type', 'application/json; charset=utf-8');
    print ajax_render($commands);
    drupal_exit();
  }
}