<?php

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

/**
 * Implements hook_boot().
 * @global type $conf
 */
function roblib_search_evergreen_boot() {
  /* below is an example from islandora_solr module for internationalization
   *  global $conf;

    // Allow i18n, by using multilingual variables.
    if (module_exists('i18n')) {
    $vars = array(
    'islandora_solr_facets',
    'islandora_solr_result_fields',
    'islandora_solr_searchterms'
    );

    if (isset($conf['i18n_variables']) && is_array($conf['i18n_variables'])) {
    $conf['i18n_variables'] = array_merge($vars, $conf['i18n_variables']);
    }
    else {
    $conf['i18n_variables'] = $vars;
    }
    } */
}

/**
 * Implements hook_menu().
 */
function roblib_search_evergreen_menu() {
  $items = array();

  $items['admin/roblib_search/evergreen_search'] = array(
    'title' => 'Evergreen Search Target configuration',
    'description' => 'Configuration for the Roblib evergreen search target',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('roblib_search_evergreen_config_form'),
    'access arguments' => array('access administration pages'),
    'type' => MENU_NORMAL_ITEM,
  );

  $items['roblib_search/evergreen/ajax/%'] = array(
    'title' => 'evergreen ajax',
    'page callback' => 'roblib_search_evergreen_ajax',
    'page arguments' => array(3),
    'type' => MENU_CALLBACK,
    'access arguments' => array('search roblib evergreen'),
  );

  return $items;
}

function roblib_search_evergreen_config_form($form, &$form_state) {
  /*
   * $url = variable_get('roblib_search_evergreen_url', 'http://137.149.200.52');
    $url_suffix = variable_get('roblib_search_evergreen_suffix', '/opac/extras/sru?version=1.1&operation=searchRetrieve&query=');
    $number_of_records = variable_get('roblib_search_evergreen_num_results', '5');
   */
  $form['roblib_search_evergreen_url'] = array(
    '#type' => 'textfield',
    '#title' => t('Evergreen url'),
    '#default_value' => variable_get('roblib_search_evergreen_url', 'http://islandpines.roblib.upei.ca/'),
    '#description' => t('The base Evergreen URL, for example http://islandpines.roblib.upei.ca/'),
    '#required' => TRUE,
  );
  $form['roblib_search_evergreen_search_suffix'] = array(
    '#type' => 'textfield',
    '#title' => t('Evergreen search suffix'),
    '#default_value' => variable_get('roblib_search_evergreen_search_suffix', '/opac/extras/sru?version=1.1&operation=searchRetrieve&query='),
    '#description' => t('The suffix will be appended to the base url for searches, for example /opac/extras/sru?version=1.1&operation=searchRetrieve&query='),
    '#required' => TRUE,
  );
  $form['roblib_search_evergreen_detail_suffix'] = array(
    '#type' => 'textfield',
    '#title' => t('Evergreen detail suffix'),
    '#default_value' => variable_get('roblib_search_evergreen_detail_suffix', '/opac/en-CA/skin/default/xml/rdetail.xml?r='),
    '#description' => t('The suffix will be appended to the base url when creating links to the Evergreen detail page, for example, /opac/en-CA/skin/default/xml/rdetail.xml?r='),
    '#required' => TRUE,
  );
  //http://islandpines.roblib.upei.ca/opac/en-CA/skin/roblib/xml/rresult.xml?rt=keyword&tp=keyword&t=
  $form['roblib_search_evergreen_catalog_base_search_url'] = array(
    '#type' => 'textfield',
    '#title' => t('Evergreen catalog base search url'),
    '#default_value' => variable_get('roblib_search_evergreen_catalog_base_search_url', 'http://islandpines.roblib.upei.ca/opac/en-CA/skin/roblib/xml/rresult.xml?rt=keyword&tp=keyword&t='),
    '#description' => t('The Catalog base url so we can repeat the search in the catalog, for example, http://islandpines.roblib.upei.ca/opac/en-CA/skin/roblib/xml/rresult.xml?rt=keyword&tp=keyword&t='),
    '#required' => TRUE,
  );
  $form['roblib_search_evergreen_num_results'] = array(
    '#type' => 'textfield',
    '#title' => t('Number of results to return'),
    '#default_value' => variable_get('roblib_search_evergreen_num_results', '5'),
    '#description' => t('The number of results to display in the Bento box'),
    '#required' => TRUE,
  );


  return system_settings_form($form);
}

/**
 * Implements hook_permission().
 */
function roblib_search_evergreen_permission() {
  return array(
    'search roblib evergreen' => array(
      'title' => t('Search the evergreen target'),
      'description' => t('Search all Roblib evergreen target. This permission exposes the search blocks and allows you to see search results.'),
    ),
    'administer roblib search_evergreen' => array(
      'title' => t('Administer Roblib Search Evergreen'),
      'description' => t('Administer settings for the Roblib evergreen search client.'),
    ),
  );
}

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

  return array(
    // results page
    'roblib_search_evergreen' => array(
      'path' => $path . '/theme',
      'file' => $file,
      'template' => 'roblib-search-evergreen',
      'variables' => array('results' => NULL),
    )
  );
}

function roblib_search_evergreen_block_info() {

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

  return $blocks;
}

function roblib_search_evergreen_block_view($delta = '') {
  //The $delta parameter tells us which block is being requested.
  switch ($delta) {
    case 'roblib_search_evergreen_results':
      // The subject is displayed at the top of the block. Note that it
      // should be passed through t() for translation. The title configured
      // for the block using Drupal UI supercedes this one.
      $block['subject'] = t('PEI Collection');
      // The content of the block is typically generated by calling a custom
      // function.
      $block['content'] = theme('roblib_search_evergreen', array('results' => NULL));
      break;
  }
  return $block;
}

function roblib_search_evergreen_ajax($query) {
  $output = roblib_search_evergreen_get_results($query);
  print $output;
  exit();
}

/**
 * 
 * @param string $query
 * @return string
 *   json 
 */
function roblib_search_evergreen_get_results($query) {
  drupal_add_css(drupal_get_path('module', 'roblib_search_evergreen') . '/css/roblib_search_evergreen.theme.css');

  $url = variable_get('roblib_search_evergreen_url', 'http://137.149.200.52');
  $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');
  $query = str_replace(' ', '%20AND%20',$query); //hack until the library decides if we want phrase or individual words
  $query .= urlencode(' AND "prince edward island"');
  $search_url = $url . $url_suffix . $query  . '&maximumRecords=' . $number_of_records;
  $catalog_base_search_url = variable_get('roblib_search_evergreen_catalog_base_search_url', 'http://islandpines.roblib.upei.ca/opac/en-CA/skin/roblib/xml/rresult.xml?rt=keyword&tp=keyword&t=');
  drupal_add_js(array('roblib_search_evergreen' => array('catalog_url' => $catalog_base_search_url)), array('type' => 'setting'));
  $results = drupal_http_request($search_url);
  if ($results->code == '200') {
    $output = roblib_search_evergreen_parse_results($results, $query);
  }
  else {
    watchdog('roblib_search_evergreen', 'Error retrieving results: %error', array('%error' => $results->status_message), WATCHDOG_ERROR);
    $output = '';
  }

  return json_encode($output);
}

/**
 * 
 * @param string $results
 *    results in marcxml
 * @return array $output
 *    information we want from the xml stored in an array
 */
function roblib_search_evergreen_parse_results($results, $query) {
  $xml = $results->data;
  if (!isset($xml)) {
    return 'no results found';
  }
  $sxml = simplexml_load_string(trim($results->data));
  $output = array();
  if ($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 = variable_get('roblib_search_evergreen_catalog_base_search_url', 'http://islandpines.roblib.upei.ca/opac/en-CA/skin/roblib/xml/rresult.xml?rt=keyword&tp=keyword&t=');
    $catalog_base_search_url .=   $query;
    $output['catalogBaseSearchUrl'] = $catalog_base_search_url; 
    
    $records = $sxml->xpath('//marcxml:record');
    //$records = $sxml->xpath('//marcxml:record/marcxml:recordData/marcxml:record/marcxml:datafield[@tag="245"]/marcxml:subfield[@code="a"]');
    $index = 0;
    foreach ($records as $record) {
      $record->registerXPathNamespace('marcxml', 'http://www.loc.gov/MARC21/slim');      
      roblib_search_evergreen_update_array($output, $index, 'title', $record->xpath('marcxml:datafield[@tag="245"]/marcxml:subfield[@code="a"]'));
      roblib_search_evergreen_update_array($output, $index, 'subtitle', $record->xpath('marcxml:datafield[@tag="245"]/marcxml:subfield[@code="b"]'));
      roblib_search_evergreen_update_array($output, $index, 'sor', $record->xpath('marcxml:datafield[@tag="245"]/marcxml:subfield[@code="c"]'));
      roblib_search_evergreen_update_array($output, $index, 'date', $record->xpath('marcxml:datafield[@tag="260"]/marcxml:subfield[@code="c"]'));
      roblib_search_evergreen_update_array($output, $index, 'id', $record->xpath('marcxml:datafield[@tag="901"]/marcxml:subfield[@code="c"]'));
      roblib_search_evergreen_holdings($output, $index, $record->xpath('marcxml:datafield[@tag="852"]'));
      roblib_search_evergreen_electronic_holdings($output, $index, $record->xpath('marcxml:datafield[@tag="856"]'));
      $id = $output[$index]['id'];
      $output[$index++]['url'] = variable_get('roblib_search_evergreen_url', 'http://137.149.200.52')
          . variable_get('roblib_search_evergreen_detail_suffix', '/opac/en-CA/skin/default/xml/rdetail.xml?r=')
          . (string)$id;
    }
  }
  return $output;
}

function roblib_search_evergreen_holdings(&$arr, $index, $xpath_result){
  $holding_index = 0;
  foreach($xpath_result as $xml){
    $xml->registerXPathNamespace('marcxml', 'http://www.loc.gov/MARC21/slim');
    $call_number = $xml->xpath('marcxml:subfield[@code="c"]');
    $arr[$index]['holdings'][$holding_index]['call_number'] = (string)$call_number[0];
    $availability = $xml->xpath('marcxml:subfield[@code="n"]');
    $arr[$index]['holdings'][$holding_index]['availability'] = (string)$availability[0];
    $location = $xml->xpath('marcxml:subfield[@code="a"]');
    $arr[$index]['holdings'][$holding_index++]['location'] = (string)$location[0];
  }  
}

function roblib_search_evergreen_electronic_holdings(&$arr, $index, $xpath_result){
  $holding_index = 0;
  foreach($xpath_result as $xml){
     $xml->registerXPathNamespace('marcxml', 'http://www.loc.gov/MARC21/slim');
     $label = $xml->xpath('marcxml:subfield[@code="y"]');
     $label = (string)$label[0];
     $url = $xml->xpath('marcxml:subfield[@code="u"]');
     $url = (string)$url[0];
     $arr[$index]['electronic_holdings'][$holding_index]['url'] = $url;
     $arr[$index]['electronic_holdings'][$holding_index++]['label'] = $label;
     
  }
}

function roblib_search_evergreen_update_array(&$arr, $index, $key, $xpath_result){
  if(!empty($xpath_result)){
    $val = (string)$xpath_result[0];
    $arr[$index][$key] = $val;
  }
}

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