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

    gatekeeper();
	action_gatekeeper();

    global $Dippler;

    $id = get_input('id');

	$course = new Course($id);
	$course->load();

    if ($course && $course->getType() == 'course' && $course->canEdit()) {
        $grades_table_data = $course->getGradesTableFull();
        $header = array(_('Title'));
        $assignments_points = array(_("Ceiling"));
        $assignments_type = array(_("Type"));
        if (sizeof($grades_table_data['assignments']) > 0) {
            foreach ($grades_table_data['assignments'] as $assignment) {
                $header []= $assignment->title;
                $assignments_points []= $assignment->maxpoints; 
                $assignments_type []= $assignment->getSubtypeString();
            }
        }
        $header = array_merge($header, array(_("Total points"), _("Grade"), _("Feedback")));
        $assignments_points = array_merge($assignments_points, array($grades_table_data['total_max_points'], '', ''));
        $assignments_type = array_merge($assignments_type, array('', '', ''));

        $csv_gen = new CSVGenerator();
        $csv_gen->addHeader($header);
        $csv_gen->addDataRow($assignments_points);
        $csv_gen->addDataRow($assignments_type);

        if (sizeof($grades_table_data['learners']) > 0) {
            foreach ($grades_table_data['learners'] as $learner) {
                $learner_data_row = array($learner->getFullname());
                if (sizeof($grades_table_data['assignments'] > 0)) {
                    foreach ($grades_table_data['assignments'] as $assignment) {
                        if (isset($grades_table_data['answers'][$learner->user_id]['answers'][$assignment->id])) {
                            $learner_data_row []= $grades_table_data['answers'][$learner->user_id]['answers'][$assignment->id]->grade;
                        } else {
                            $learner_data_row []= '';
                        }
                    }
                }
                if (isset($grades_table_data['answers'][$learner->user_id]['answers']['total_points'])) {
                    $learner_data_row []= $grades_table_data['answers'][$learner->user_id]['answers']['total_points'];
                } else {
                    $learner_data_row []= '';
                }
                if (isset($grades_table_data['grades'][$learner->id])) {
                    $learner_data_row []= $grades_table_data['grades'][$learner->id]->getGrade();
                    $learner_data_row []= $grades_table_data['grades'][$learner->id]->getFeedback();
                } else {
                    $learner_data_row = array_merge($learner_data_row, array('', ''));
                }

                $csv_gen->addDataRow($learner_data_row);
            }
        }

        header('Content-Type: text/csv');
        header('Content-Disposition: attachment; filename="course_' . $course->id . '_grades_' . time() . '.csv"');

        echo $csv_gen->getData();
        unset($csv_gen);
        exit;
	}