<?php

/**
 * FeedAPI mapper for user reference CCK fields.
 * Matt Johnson, Observer Media Group (johnson.matthew.david@gmail.com / xmattus on drupal.org)
 */

/**
 * Implementation of hook_feedapi_mapper for userreference.module (the CCK add-on).
 * This mostly follows the example of the general CCK mapper (feedapi_mapper_content.inc)
 * but has some special logic for handling users. This accepts either user names (as strings) or UIDs (as integers).
 *
 * @param string $op
 * @param Drupal node $node
 * @param string $field_name
 * @param string, number or array of string or number $feed_element
 * @param string or number as id $sub_field
 *
 */
function userreference_feedapi_mapper($op, $node, $field_name, $feed_element = array(), $sub_field = '') {
  // Test for the node field that we would like to map to.
  if (strpos($field_name, 'field_') === 0) {
    if ($op == 'describe') {
      // Help text for the mapping page.
      if (feedapi_mapper_content_is_cck_type($field_name, array('userreference'))) {
        return t('Maps a user name (string) or uid (integer) to a user reference field.');
      }
    }
    else if ($op == 'list') {
      // Here we are being asked to list sub fields we would like to map to.
      if (feedapi_mapper_content_is_cck_type($field_name, array('userreference'))) {
        return TRUE;
      }
      return FALSE;
    }
    else if ($op == 'map') {
      // Convert a name to UID, or if numeric, use directly as a uid.
      if (!is_array($feed_element)) {
        if (is_numeric($feed_element)) {
          $uid = $feed_element;
        }
        else {
          $uid = db_result(db_query("SELECT uid FROM {users} WHERE name='%s'", $feed_element));
        }
        if ($uid) {
          // User reference fields use 'uid' as the array key in lieu of 'value' like other CCK fields.
          $field = isset($node->$field_name) ? $node->$field_name : array();
          $field[0]['uid'] = $uid;
          $node->$field_name = $field;
        }
      }
      return $node;
    }
  }
}