$school = school_load_guess();

if (!$school['crawled'])

  clean_empty_exit();

$cache_dir = dirname(__FILE__) . DIRECTORY_SEPARATOR . 'cache' . DIRECTORY_SEPARATOR . 'auto' . DIRECTORY_SEPARATOR . $school['id'] . DIRECTORY_SEPARATOR;

/*

 * autocomplete the list of departments. If the user has already

 * entered a valid department name _and_ delimitted it, however, go on

 * to the next autocompletion step.

 */

$term_strlen = strlen($term);

$dept_strlen = strlen($term_parts['department']);

$dept = $term_parts['department'];

if (!$getsections && count($term_parts) == 1 && $term_strlen == strlen($dept))

  {

    $dept_file = $cache_dir . '-depts';

    if (!file_exists($dept_file))

      clean_empty_exit();

    $deptartments = unserialize(file_get_contents($dept_file));

    foreach ($deptartments as $key => $department)

      {

	if (!strncmp($department, $dept, $term_strlen))

	else

	  unset($departments[$key]);

      }

    echo json_encode($departments);

    exit(0);

  }

if ($getsections)

  {

    $section_file = $cache_dir . $dept . DIRECTORY_SEPARATOR . $term_parts['course'];

    if (file_exists($section_file))

      {

	readfile($section_file);

	exit(0);

      }

    /* section not found! */

    header('HTTP/1.1 404: Not found');

    header('Content-Type: text/plain; encoding=utf-8');

    echo 'Could not find course ' . implode('-', $term_parts) . "\n";

    exit(0);

  }

/*

 * if a department is fully entered, life gets slightly more