<?php
/*
  +--------------------------------------------------------------------+
  | CiviCRM version 4.3                                                |
  +--------------------------------------------------------------------+
  | Copyright CiviCRM LLC (c) 2004-2013                                |
  +--------------------------------------------------------------------+
  | This file is a part of CiviCRM.                                    |
  |                                                                    |
  | CiviCRM is free software; you can copy, modify, and distribute it  |
  | under the terms of the GNU Affero General Public License           |
  | Version 3, 19 November 2007 and the CiviCRM Licensing Exception.   |
  |                                                                    |
  | CiviCRM is distributed in the hope that it will be useful, but     |
  | WITHOUT ANY WARRANTY; without even the implied warranty of         |
  | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.               |
  | See the GNU Affero General Public License for more details.        |
  |                                                                    |
  | You should have received a copy of the GNU Affero General Public   |
  | License and the CiviCRM Licensing Exception along                  |
  | with this program; if not, contact CiviCRM LLC                     |
  | at info[AT]civicrm[DOT]org. If you have questions about the        |
  | GNU Affero General Public License or the licensing of CiviCRM,     |
  | see the CiviCRM license FAQ at http://civicrm.org/licensing        |
  +--------------------------------------------------------------------+
*/

/**
 *
 * @package CRM
 * @copyright CiviCRM LLC (c) 2004-2013
 * $Id$
 *
 */

/**
 * Class that uses Yahoo! PlaceFinder API to retrieve the lat/long of an address
 * Documentation is at http://developer.yahoo.com/geo/placefinder/
 */
class CRM_Utils_Geocode_Yahoo {

  /**
   * server to retrieve the lat/long
   *
   * @var string
   * @static
   */
  static protected $_server = 'where.yahooapis.com';

  /**
   * uri of service
   *
   * @var string
   * @static
   */
  static protected $_uri = '/geocode';

  /**
   * function that takes an address array and gets the latitude / longitude
   * and postal code for this address. Note that at a later stage, we could
   * make this function also clean up the address into a more valid format
   *
   * @param array $values associative array of address data: country, street_address, city, state_province, postal code
   * @param boolean $stateName this parameter currently has no function
   *
   * @return boolean true if we modified the address, false otherwise
   * @static
   */
  static function format(&$values, $stateName = FALSE) {
    CRM_Utils_System::checkPHPVersion(5, TRUE);

    $config = CRM_Core_Config::singleton();

    $add = "appid=" . urlencode($config->mapAPIKey);

    $add .= '&location=';

    if (CRM_Utils_Array::value('street_address', $values)) {
      $add .= urlencode($values['street_address']);
      $add .= ',+';
    }

    if ($city = CRM_Utils_Array::value('city', $values)) {
      $add .= urlencode($city);
      $add .= ',+';
    }

    if (CRM_Utils_Array::value('state_province', $values)) {
      if (CRM_Utils_Array::value('state_province_id', $values)) {
        $stateProvince = CRM_Core_DAO::getFieldValue('CRM_Core_DAO_StateProvince', $values['state_province_id']);
      }
      else {
        if (!$stateName) {
          $stateProvince = CRM_Core_DAO::getFieldValue('CRM_Core_DAO_StateProvince',
            $values['state_province'],
            'name',
            'abbreviation'
          );
        }
        else {
          $stateProvince = $values['state_province'];
        }
      }

      // dont add state twice if replicated in city (happens in NZ and other countries, CRM-2632)
      if ($stateProvince != $city) {
        $add .= urlencode($stateProvince);
        $add .= ',+';
      }
    }

    if (CRM_Utils_Array::value('postal_code', $values)) {
      $add .= urlencode($values['postal_code']);
      $add .= ',+';
    }

    if (CRM_Utils_Array::value('country', $values)) {
      $add .= urlencode($values['country']);
    }

    $query = 'http://' . self::$_server . self::$_uri . '?' . $add;

    require_once 'HTTP/Request.php';
    $request = new HTTP_Request($query);
    $request->sendRequest();
    $string = $request->getResponseBody();
    // see CRM-11359 for why we suppress errors with @
    $xml = @simplexml_load_string($string);

    if ($xml === FALSE) {
      // account blocked maybe?
      CRM_Core_Error::debug_var('Geocoding failed.  Message from Yahoo:', $string);
      return FALSE;
    }

    if ((integer)$xml->Error != 0) {
      CRM_Core_Error::debug_var('Geocoding failed.  Message from Yahoo:', (string)$xml->ErrorMessage);
      return FALSE;
    }

    if (is_a($xml->Result[0], 'SimpleXMLElement')) {
      $result = array();
      $result = get_object_vars($xml->Result[0]);

      foreach ($result as $key => $val) {
        if (is_scalar($val) &&
          strlen($val)
        ) {
          $ret[(string)$key] = (string)$val;
        }
      }

      $values['geo_code_1'] = $ret['latitude'];
      $values['geo_code_2'] = $ret['longitude'];

      if ($ret['postal']) {
        $current_pc = CRM_Utils_Array::value('postal_code', $values);
        $skip_postal = FALSE;

        if ($current_pc) {
          $current_pc_suffix   = CRM_Utils_Array::value('postal_code_suffix', $values);
          $current_pc_complete = $current_pc . $current_pc_suffix;
          $new_pc_complete     = preg_replace("/[+-]/", '', $ret['postal']);

          // if a postal code was already entered, don't change it, except to make it more precise
          if (strpos($new_pc_complete, $current_pc_complete) !== 0) {
            // Don't bother anonymous users with the message - they can't change a form they just submitted anyway
            if(CRM_Utils_System::isUserLoggedIn()) {
              $msg = ts('The Yahoo Geocoding system returned a different postal code (%1) than the one you entered (%2). If you want the Yahoo value, please delete the current postal code and save again.', array(
                1 => $ret['postal'],
                2 => $current_pc_suffix ? "$current_pc-$current_pc_suffix" : $current_pc
              ));
            
              CRM_Core_Session::setStatus($msg, ts('Postal Code Mismatch'), 'error');
            }
            $skip_postal = TRUE;
          }
        }

        if (!$skip_postal) {
          $values['postal_code'] = $ret['postal'];

          /* the following logic to split the string was borrowed from
             CRM/Core/BAO/Address.php -- CRM_Core_BAO_Address::fixAddress.
             This is actually the function that calls the geocoding
             script to begin with, but the postal code business takes
             place before geocoding gets called.
          */

          if (preg_match('/^(\d{4,5})[+-](\d{4})$/',
              $ret['postal'],
              $match
            )) {
            $values['postal_code'] = $match[1];
            $values['postal_code_suffix'] = $match[2];
          }
        }
      }
      return TRUE;
    }

    // reset the geo code values if we did not get any good values
    $values['geo_code_1'] = $values['geo_code_2'] = 'null';
    return FALSE;
  }
}