<?php  // $Id$

    require_once("../../config.php");
    require_once("lib.php");
 
    $id = optional_param('id', 0, PARAM_INT);  // Course Module ID
    $a  = optional_param('a', 0, PARAM_INT);   // Assignment ID

    if ($id) {
        if (! $cm = get_coursemodule_from_id('assignment', $id)) {
            print_error('invalidcoursemodule');
        }

        if (! $assignment = $DB->get_record("assignment", array("id"=>$cm->instance))) {
            print_error('invalidid', 'assignment');
        }

        if (! $course = $DB->get_record("course", array("id"=>$assignment->course))) {
            print_error('coursemisconf', 'assignment');
        }
    } else {
        if (!$assignment = $DB->get_record("assignment", array("id"=>$a))) {
            print_error('invalidid', 'assignment');
        }
        if (! $course = $DB->get_record("course", array("id"=>$assignment->course))) {
            print_error('coursemisconf', 'assignment');
        }
        if (! $cm = get_coursemodule_from_instance("assignment", $assignment->id, $course->id)) {
            print_error('invalidcoursemodule');
        }
    }

    require_login($course, true, $cm);

    require ("$CFG->dirroot/mod/assignment/type/$assignment->assignmenttype/assignment.class.php");
    $assignmentclass = "assignment_$assignment->assignmenttype";
    $assignmentinstance = new $assignmentclass($cm->id, $assignment, $cm, $course);

/// Mark as viewed
    $completion=new completion_info($course);
    $completion->set_module_viewed($cm);

    $assignmentinstance->view();   // Actually display the assignment!
?>