/**
  * Return the generated form output.
  * @param array $args List of parameter values passed through to the form depending on how the form has been configured.
  * This array always contains a value for language.
  * @param object $node The Drupal node object.
  * @param array $response When this form is reloading after saving a submission, contains the response from the service call.
  * Note this does not apply when redirecting (in this case the details of the saved object are in the $_GET data).
  * @return Form HTML.
  * @todo: Implement this method 
  */
 public static function get_form($args, $node, $response = null)
 {
     if (empty($_GET['group_id'])) {
         return 'This page needs a group_id URL parameter.';
     }
     require_once 'includes/map.php';
     require_once 'includes/groups.php';
     global $indicia_templates;
     iform_load_helpers(array('report_helper', 'map_helper'));
     $conn = iform_get_connection_details($node);
     $readAuth = report_helper::get_read_auth($conn['website_id'], $conn['password']);
     report_helper::$javascript .= "indiciaData.website_id={$conn['website_id']};\n";
     report_helper::$javascript .= "indiciaData.nodeId={$node->nid};\n";
     group_authorise_form($args, $readAuth);
     $group = data_entry_helper::get_population_data(array('table' => 'group', 'extraParams' => $readAuth + array('id' => $_GET['group_id'], 'view' => 'detail')));
     $group = $group[0];
     hostsite_set_page_title("{$group['title']}: {$node->title}");
     $actions = array();
     if (!empty($args['edit_location_path'])) {
         $actions[] = array('caption' => 'edit', 'url' => '{rootFolder}' . $args['edit_location_path'], 'urlParams' => array('group_id' => $_GET['group_id'], 'location_id' => '{location_id}'));
     }
     $actions[] = array('caption' => 'remove', 'javascript' => "remove_location_from_group({groups_location_id});");
     $leftcol = report_helper::report_grid(array('readAuth' => $readAuth, 'dataSource' => 'library/locations/locations_for_groups', 'sendOutputToMap' => true, 'extraParams' => array('group_id' => $_GET['group_id']), 'rowId' => 'location_id', 'columns' => array(array('display' => 'Actions', 'actions' => $actions, 'caption' => 'edit', 'url' => '{rootFolder}'))));
     $leftcol .= '<fieldset><legend>' . lang::Get('Add sites to the group') . '</legend>';
     $leftcol .= '<p>' . lang::get('LANG_Add_Sites_Instruct') . '</p>';
     if (!empty($args['edit_location_path'])) {
         $leftcol .= lang::get('Either') . ' <a class="button" href="' . hostsite_get_url($args['edit_location_path'], array('group_id' => $_GET['group_id'])) . '">' . lang::get('enter details of a new site') . '</a><br/>';
     }
     $leftcol .= data_entry_helper::select(array('label' => lang::get('Or, add an existing site'), 'fieldname' => 'add_existing_location_id', 'report' => 'library/locations/locations_available_for_group', 'caching' => false, 'blankText' => lang::get('<please select>'), 'valueField' => 'location_id', 'captionField' => 'name', 'extraParams' => $readAuth + array('group_id' => $_GET['group_id'], 'user_id' => hostsite_get_user_field('indicia_user_id', 0)), 'afterControl' => '<button id="add-existing">Add</button>'));
     $leftcol .= '</fieldset>';
     // @todo Link existing My Site to group. Need a new report to list sites I created, with sites already in the group
     // removed. Show in a drop down with an add button. Adding must create the groups_locations record, plus refresh
     // the grid and refresh the drop down.
     // @todo set destination after saving added site
     $map = map_helper::map_panel(iform_map_get_map_options($args, $readAuth), iform_map_get_ol_options($args));
     $r = str_replace(array('{col-1}', '{col-2}'), array($leftcol, $map), $indicia_templates['two-col-50']);
     data_entry_helper::$javascript .= "indiciaData.group_id={$_GET['group_id']};\n";
     return $r;
 }