<?php
// $Id
/**
 * @file relationships/nodereference.inc
 *
 * Plugin to provide an relationship handler for CCK's nodereference
 */

function panels_nodereference_panels_relationships() {
  if (module_exists('nodereference')) {
    $args['nodereference'] = array(
      'title' => t("Node reference"),
      'keyword' => 'nodereference',
      'description' => t('Gets a node reference (CCK) from a node context.'),
      'required context' => new panels_required_context(t('Node'), 'node'),
      'context' => 'panels_nodereference_context',
      'settings form' => 'panels_nodereference_settings_form',
      'settings form validate' => 'panels_nodereference_settings_form_validate',
      );
  return $args;
  }
}

/**
 * Return a new context based on an existing context
 */
function panels_nodereference_context($context = NULL, $conf) {
  $noderef_field = $conf['field'];
  if (!empty($context->data)
      && isset($context->data->$noderef_field)) {
    $ref = $context->data->$noderef_field;
    if (!empty($ref)) {
      $node = node_load($ref[0]['nid']);
      return panels_context_create('node', $node);
    }
  }

  // If unset it wants a generic, unfilled context, which is just NULL
  return panels_context_create_empty('node');
}

/**
 * Settings form for the relationship
 */
function panels_nodereference_settings_form($conf) {
  $noderef_fields = array();
  foreach ( content_fields() as $fname => $field) {
    if ($field['type'] == 'nodereference') {
      $noderef_fields[$fname] = $field['widget']['label'];
    }
  }

  $form['field'] = array(
    '#type' => 'select',
    '#title' => t('Node reference field'),
    '#options' => $noderef_fields,
    '#default_value' => $conf['field']
  );

  return $form;
}