<?php

/**
 * Plugin to provide an relationship handler for node from user
 */
function bio_panels_relationships() {
  $args['node_from_user'] = array(
    'title' => t("Node from user"),
    'keyword' => 'node',
    'description' => t('Adds a node from user context'),
    'required context' => new panels_required_context(t('User'), 'user'),
    'context' => 'bio_panels_context',
  );
  return $args;
}

/**
 * Return a new context based on an existing context
 */
function bio_panels_context($context = NULL, $conf) {
  // If unset it wants a generic, unfilled context, which is just NULL
  if (empty($context->data)) {
    return panels_context_create_empty('node', NULL);
  }

  if (isset($context->data->uid)) {
    // Load the NID for the user's bio node
    $nid = bio_for_user($context->data->uid);
    
    // Load the node object itself
    $bionode = node_load(array('nid'=>$nid));
    
    // Send it to panels
    return panels_context_create('node', $bionode);
  } else {
    return panels_context_create_empty('node', NULL);
  }   
}