<?php

/**
 * @file
 * Implementation of Roblib search for searching several targets.
 */


/**
 * Implements hook_menu().
 */
function roblib_search_passthru_menu() {
  $items = [];

  $items['roblib_search/passthru/scholar/ajax/%'] = [
    'title' => 'Passthru ajax',
    'page callback' => 'roblib_search_passthru_islandscholar_ajax',
    'page arguments' => [4],
    'type' => MENU_CALLBACK,
    'access arguments' => ['search roblib'],
  ];
  $items['roblib_search/passthru/evergreen/ajax/%'] = [
    'title' => 'evergreen ajax',
    'page callback' => 'roblib_search_passthru_evergreen_ajax',
    'page arguments' => [4],
    'type' => MENU_CALLBACK,
    'access arguments' => ['search roblib'],
  ];
  $items['roblib_search/passthru/eds/ajax/%'] = [
    'title' => 'eds ajax',
    'page callback' => 'roblib_search_passthru_eds_ajax',
    'page arguments' => [4],
    'type' => MENU_CALLBACK,
    'access arguments' => ['search roblib'],
  ];

  return $items;
}

function roblib_search_passthru_evergreen_ajax($query) {
  $output = roblib_search_passthru_evergreen_get_results($query);
  print $output;
  exit();
}

function roblib_search_passthru_eds_ajax($query) {
  $output = roblib_search_eds_get_results($query);
  print $output;
  exit();
}

/**
 *
 * @param string $query
 *
 * @return string
 *   json
 */
function roblib_search_passthru_evergreen_get_results($query) {
  $url = variable_get('roblib_search_evergreen_url', 'http://islandpines.roblib.upei.ca');
  $url_suffix = variable_get('roblib_search_evergreen_search_suffix', '/opac/extras/sru?version=1.1&operation=searchRetrieve&query=');
  $number_of_records = variable_get('roblib_search_evergreen_num_results', '5');
  $query = trim($query);
  $query = str_replace(' ', '%20AND%20', $query); //hack until the library decides if we want phrase or individual words
  $query .= '%20AND%20%22prince%20edward%20island%22';
  $search_url = $url . $url_suffix . $query . '&maximumRecords=' . $number_of_records;
  $results = drupal_http_request($search_url);
  if ($results->code == '200') {
    $output = roblib_search_passthru_evergreen_parse_results($results, $query);
  }
  else {
    watchdog('roblib_search_evergreen', 'Error retrieving results: %error', ['%error' => $results->status_message], WATCHDOG_ERROR);
    $output = '';
  }
  return json_encode($output);
}

/**
 *
 * @param string $results
 *    results in marcxml
 *
 * @return array $output
 *    information we want from the xml stored in an array
 */
function roblib_search_passthru_evergreen_parse_results($results, $query) {
  $xml = $results->data;
  if (!isset($xml)) {
    return 'no results found';
  }
  $sxml = simplexml_load_string(trim($results->data));
  $output = [];
  if ($sxml) {
    $sxml->registerXPathNamespace('marcxml', 'http://www.loc.gov/MARC21/slim');
    $sxml->registerXPathNamespace('srw', 'http://www.loc.gov/zing/srw/');
    $number_of_records = $sxml->xpath('//srw:numberOfRecords');
    $output['numberOfRecords'] = (string) $number_of_records[0];
    $catalog_base_search_url = 'http://islandpines.roblib.upei.ca/eg/opac/results?qtype=keyword&l=4&d=2&ol=4&tp=&query=';
    $catalog_base_search_url .= $query;
    $output['catalogBaseSearchUrl'] = $catalog_base_search_url;
  }
  return $output;
}

/**
 * Implements hook_theme().
 */
function roblib_search_passthru_theme() {
  // set path
  $path = drupal_get_path('module', 'roblib_search_passthru');
  $file = 'theme.inc';

  return [
    // results page
    'roblib_search_passthru' => [
      'path' => $path . '/theme',
      'file' => $file,
      'template' => 'roblib-search-passthru',
      'variables' => ['results' => NULL],
    ],
  ];
}

function roblib_search_passthru_block_info() {

  $blocks['roblib_passthru_results'] = [
    // info: The name of the block.
    'info' => t('Misc Results'),
    // Block caching options (per role, per user, etc.)
    'cache' => DRUPAL_CACHE_PER_ROLE,
  ];


  return $blocks;
}

function roblib_search_passthru_preprocess_panels_pane(&$variables, $hook) {
  if ($variables['pane']->subtype == 'roblib_search_passthru-roblib_passthru_results') {
    $variables['title_prefix'] = '<div class="roblib-search-header roblib-search-passthru-header">';
    $variables['title_suffix'] = '</div>';
  }
}

/**
 * Implements hook_block_view().
 */
function roblib_search_passthru_block_view($delta = '') {
  $block = [];
  switch ($delta) {
    case 'roblib_passthru_results':
      $block['subject'] = t('Misc Results');
      $block['content'] = theme('roblib_search_passthru', ['results' => NULL]);
      break;
  }
  return $block;
}

/**
 * An endpoint for the passthru ajax call
 *
 * @param string $query
 *
 */
function roblib_search_passthru_islandscholar_ajax($query) {
  $output = roblib_search_passthru_get_results($query);
  print $output;
  exit();
}

/**
 * @param $query
 *
 * @return string
 */
function roblib_search_passthru_get_search_url($query) {
  $solr_url = variable_get('roblib_search_islandscholar_url', 'http://islandscholar.ca:8080/solr');
  $num_results = variable_get('roblib_search_islandscholar_num_results', '5');
  $data = [
    'wt' => 'json',
    'q' => $query,
    'fq' => variable_get('roblib_search_islandscholar_fq', 'PID:ir* AND (RELS_EXT_hasModel_uri_ms:info\:fedora/ir\:thesisCModel OR RELS_EXT_hasModel_uri_ms:info\:fedora/ir\:citationCModel)'),
    'qf' => variable_get('roblib_search_islandscholar_qf', 'dc.title^2.5 dc.creator^5.0 dc.contributor^2.0 dc.description^2.0 dc.identifier^2.0 dc.type^2.0 catch_all_fields_mt^1.0'),
    'rows' => $num_results,
    'defType' => 'dismax',
  ];
  $url = url($solr_url . '/select', ['query' => $data]);
  return $url;
}

/**
 *
 * @param string $query
 *
 * @return string
 *   json
 */
function roblib_search_passthru_get_results($query) {
  $url = roblib_search_passthru_get_search_url($query);
  $results = drupal_http_request($url);
  if ($results->code != '200') {
    return "";
  }
  return $results->data;
}

/**
 * Implements hook_help().
 */
function roblib_search_passthru_help($path, $arg) {
  switch ($path) {
    case 'admin/help#roblib_search_passthru':
      return t(
        '<p>
provides a Passthru target for the Roblib search module
</p>'
      );
  }
}