<?php

    require_once(dirname(dirname(__FILE__))."/engine/engine.php");

    gatekeeper();
	action_gatekeeper();

    global $Dippler;

	$course_id = (int)get_input('course_id');
	$answer_id = (int)get_input('answer_id');
    $answer_feedback = get_input('answer_feedback');
    $answer_points = (int)get_input('answer_points');
    if ($answer_points<0) {
        $answer_points = 0;
    }

	// Cache variables
	$input_values = array();
	$input_values['answer_feedback'] = $answer_feedback;
	$input_values['answer_points'] = $answer_points;
    $_SESSION['input_values'] = $input_values;

	if (empty($answer_feedback)) {
		$Dippler->add_system_message(_("At least one of the parameters is empty."), 'error');
		forward("course/assignments/{$course_id}/answer/{$answer_id}/view");
	} else if (empty($answer_id)) {
	    $Dippler->add_system_message(_("Answer not found."), 'error');
		forward("course/assignments/{$course_id}");
	} else if (empty($course_id)) {
	    $Dippler->add_system_message(_("Course not found."), 'error');
		forward('courses/my');
	} else {
        $answer = new Answer($answer_id);
		$answer->load();
        $course = new Course($course_id);
        $course->load();
			if ($answer && $course) {
          		if ($course->canEdit()) {
                    $answer->feedback = $answer_feedback;
                    $answer->grade = $answer_points;
            		if (!$answer->save_grade()) {
            		    $Dippler->add_system_message(_("Answer could not be graded.."), 'error');
            			forward("course/assignments/{$course_id}/answer/{$answer_id}/view");
            		}
          		} else {
      		        $Dippler->add_system_message(_("No rights to facilitate course."), 'error');
      		        forward("course/assignments/{$course_id}/answer/{answer_id}/view");
      		    }
      		} else {
      		    $Dippler->add_system_message(_("Answer could not be graded."), 'error');
		}

		$Dippler->add_system_message(_("Answer graded."));

		// Clear cache
        $Dippler->clearSessionInputValues();
		forward("course/assignments/{$course_id}/assignment/{$answer->assignment}/submissions");
	}

	forward('courses/my');
?>