* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU Affero General Public License for more details.

 *

 * You should have received a copy of the GNU Affero General Public License

 * along with slate_permutate.  If not, see <http://www.gnu.org/licenses/>.

 */

/**

 * \file

 *   This file's purpose is to autocomplete class names for supporting

 *   the autocomplete JS based off of crawling schools' registration

 *   websites. This shall only perform the autocompletion of class

 *   names.

 *

 *   Since we output JSON, no special Page classes and stuff

 *   :-p. Except we still call the Page class's session_start()

 *   function because we apparently need sessions.... oh yeah, for

 *   school profile supports ;-).

 */

require_once('inc/school.inc');

require_once('inc/class.page.php');

require_once('inc/class.course.inc');

if (isset($_REQUEST['txt'])) {

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

}

else {

  header('Content-Type: application/json; encoding=utf-8');

}

if (!isset($_REQUEST['term'])) {

  clean_empty_exit();

}

$getsections = FALSE;

if (isset($_REQUEST['getsections'])) {

  $getsections = TRUE;

}

$term = $_REQUEST['term'];

$term_parts = Course::parse($term);

if (!count($term_parts)) {

  clean_empty_exit();

}

/*

$school = school_load_guess(FALSE);

if (!$school['crawled']) {

  clean_empty_exit();

}

$semester = school_semester_guess($school, FALSE);

$cache_dir = dirname(__FILE__) . DIRECTORY_SEPARATOR . 'cache' . DIRECTORY_SEPARATOR . 'auto'

  . DIRECTORY_SEPARATOR . $school['id'] . DIRECTORY_SEPARATOR . $semester['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();

    }

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

    $json_depts = array();

    if (!empty($departments) && is_array($departments[0]))

      {

	/* New format with department names/labels */

	foreach ($departments as $department)

	  if (!strncmp($department['value'], $dept, $dept_strlen))

	    $json_depts[] = $department;

      }

    else

      {

	/* Old format with just department id. */

	foreach ($departments as $department)

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

	    $json_depts[] = $department;

      }

    /*

     * If what the user has entered already can only be completed to a

     * particular department, start displaying courses from that

     * department instead of just returning that one department.

     */

    if (count($json_depts) == 1)

      {

	$dept = $json_depts[0];

   *   the 404 page.

   */

  public static function show_404($message = 'The page you were looking for cannot be found!.')

  {

    $page_404 = page::page_create('404: Content Not Found');

    $page_404->head();

    echo "<h2>404: Content Not Found</h2>\n"

      . "<p>\n"

      . '  ' . $message . "\n"

      . "</p>\n";

    $page_404->foot();

    exit();

  }

  /**

   * \brief

   *   Start the PHP session by calling session_start().

   *

   * Used to make sure that different areas of our code don't call

   * session_start() multiple times and to make it easier to ensure

   * that session_start() is called at least before it's needed.

   */

  {

    static $session_started = FALSE;

    if (!$session_started)

      {

	session_name('slate_permutate');

	session_start();

	$session_started = TRUE;

      }

  }

  /**

   * \brief

   *   Perform a redirect.

   *

   * By consolidating all redirects here, we're hopefully able to do

   * it in a somewhat compliant and portablish way ;-).

   *

   * This function does not return. It calls exit().

   *

   * \param $dest

   *   A URL relative to the slate_permutate root. For example,

   *   'input.php' or '44' (for clean urls, for example).

   * \param $http_code

   *   The redirection code to use, if any. For example, this can be

   *   used to implement ``permanent'' redirects if necessary.

   */

  public static function redirect($dest, $http_code = NULL)

  {