<?php
/**
 * @file
 * provides apachesolr Views implementation for the location's location code
 */

class apachesolr_views_location_filter extends views_handler_filter {
  // private variables to hold our lat/lng combo
  protected $_latitude = 0;
  protected $_longitude = 0;
  
  /**
   * on init grab the stuff from the url
   */
  function init(&$view, $options) {
    parent::init($view, $options);
    
    // fetch these values
    $this->_latitude = $_GET['latitude'];
    $this->_longitude = $_GET['longitude'];
  }
  /**
   * provide a default option for the distance radius look up
   */
  function option_definition() {
    $options = parent::option_definition();
    
    // default radius
    $options['radius'] = array('default' => 10);
    // make the operator optional
    $options['operator']['default'] = 'optional';
    $options['exposed']['default'] = TRUE;
    return $options;
  }
  
  /**
   * present the expose options
   */
  function expose_options() {
    parent::expose_options();
    $this->options['expose']['identifier'] = 'location';
  }
  
  /**
   * provides an admin form for the options
   */
  function options_form(&$form, &$form_state) {
    parent::options_form($form, $form_state);
    $form['radius'] = array(
      '#type' => 'select',
      '#title' => t('Search Radius'),
      '#default_value' => $this->options['radius'],
      '#options' => drupal_map_assoc(range(10, 100, 10)),
      '#description' => t('In miles'),
    );
  }
  
  /**
   * Provide a simple textfield for equality
   */
  function exposed_form(&$form, &$form_state) {
    if (isset($this->options['expose']['identifier'])) {
      $key = $this->options['expose']['identifier'];
      $form[$key] = array(
        '#type' => 'textfield',
        '#size' => 15,
        '#default_value' => $this->value,
        '#attributes' => array('title' => t('Enter the terms you wish to search for.')),
      );
      $form['latitude'] = array(
        '#type' => 'hidden',
        '#value' => 0,
      );
      $form['longitude'] = array(
        '#type' => 'hidden',
        '#value' => 0,
      );
      $form['country'] = array(
        '#type' => 'hidden',
        '#value' => 'us',
      );
      
      // add teh JS
      $gkey = gmap_get_key();
      $script = 'document.write(unescape("%3Cscript type=\"text/javascript\" src=\"http://maps.google.com/maps?file=api&amp;v=2.x&amp;key=' . $gkey . ' \"%3E%3C/script%3E"));';     
      drupal_add_js($script, 'inline', 'footer');
      
      drupal_add_js('
        Drupal.behaviors.locationViewsGeocode = function() {
          var $location = $("#edit-' . $key . '");
          var $country = $("#edit-country");
          var $submit = $(".views-exposed-widget input:submit");
          
          // add in a click function to prevent form from submiting
          $submit.click(function() {
            return false; // prevent it from submitting now
          });
          
          // heres the real submit function ;)
          $submit.click(function () {
            if ($location.val() == "") {
              $(".view-filters > form").submit();
              return; // we done here
            }
            var geocoder = new GClientGeocoder();
            // now we geocode via Google. YA!
            geocoder.getLocations($location.val() + "," + $country.val() , function(response) {
              // if valid geocode
              if (response.Status.code == 200) {
                // clear the old error if shown
                if ($("#error-location").length) {
                  $("#error-location").remove();
                  $location.removeClass("error");
                }
                place = response.Placemark[0];
                $("#edit-latitude").val(place.Point.coordinates[1]);
                $("#edit-longitude").val(place.Point.coordinates[0]);
                $(".view-filters > form").submit();
              }
              else {
                if (!$("#error-location").length) {
                  $location.addClass("error");
                  $location.parent().prepend(\'<div id="error-location" class="messages error">This location code cannot be located.</div>\');
                  $("#edit-state").val("");
                  $("#edit-city").val("");
                  $("#edit-latitude").val("");
                  $("#edit-longitude").val("");
                }
              }
            });
          });
        };
      ', 'inline');
    }
  }
  
  /**
   * tell apachesolr howto query with this
   */
  function query() {
    if (!empty($this->_latitude)) {
      // do my stuff here
      $this->query->set_param('lat', $this->_latitude);
      $this->query->set_param('long', $this->_longitude);
      $this->query->set_param('radius', $this->options['radius']);
      $this->query->change_query_template('geo');
      
      // add the params to the url for the facet blocks
      $this->query->add_url_query_param('latitude', $this->_latitude);
      $this->query->add_url_query_param('longitude', $this->_longitude);
    }
  }
  
}