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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Exports selected outcomes in CSV format
 *
 * @package   core_grades
 * @copyright 2008 Moodle Pty Ltd (http://moodle.com)
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require_once '../../../config.php';
require_once $CFG->dirroot.'/grade/lib.php';
require_once $CFG->libdir.'/gradelib.php';

$courseid = optional_param('id', 0, PARAM_INT);
$action   = optional_param('action', '', PARAM_ALPHA);

/// Make sure they can even access this course
if ($courseid) {
    if (!$course = $DB->get_record('course', array('id' => $courseid))) {
        print_error('invalidcourseid');
    }
    require_login($course);
    $context = context_course::instance($course->id);
    require_capability('moodle/grade:manage', $context);

if (empty($CFG->enableoutcomes)) {
        redirect('../../index.php?id='.$courseid);
    }

} else {
    require_once $CFG->libdir.'/adminlib.php';
    admin_externalpage_setup('outcomes');
}

require_sesskey();

header("Content-Type: text/csv; charset=utf-8");
// TODO: make the filename more useful, include a date, a specific name, something...
header('Content-Disposition: attachment; filename=outcomes.csv');

// sending header with clear names, to make 'what is what' as easy as possible to understand
$header = array('outcome_name', 'outcome_shortname', 'outcome_description', 'scale_name', 'scale_items', 'scale_description');
echo format_csv($header, ';', '"');

$outcomes = array();
if ( $courseid ) {
    $outcomes = array_merge(grade_outcome::fetch_all_global(), grade_outcome::fetch_all_local($courseid));
} else {
    $outcomes = grade_outcome::fetch_all_global();
}

foreach($outcomes as $outcome) {

$line = array();

$line[] = $outcome->get_name();
    $line[] = $outcome->get_shortname();
    $line[] = $outcome->get_description();

$scale = $outcome->load_scale();
    $line[] = $scale->get_name();
    $line[] = $scale->compact_items();
    $line[] = $scale->get_description();

echo format_csv($line, ';', '"');
}

/**
 * Formats and returns a line of data, in CSV format. This code
 * is from http://au2.php.net/manual/en/function.fputcsv.php#77866
 *
 * @param string[] $fields data to be exported
 * @param string $delimiter char to be used to separate fields
 * @param string $enclosure char used to enclose strings that contains newlines, spaces, tabs or the delimiter char itself
 * @returns string one line of csv data
 */
function format_csv($fields = array(), $delimiter = ';', $enclosure = '"') {
    $str = '';
    $escape_char = '\\';
    foreach ($fields as $value) {
        if (strpos($value, $delimiter) !== false ||
                strpos($value, $enclosure) !== false ||
                strpos($value, "\n") !== false ||
                strpos($value, "\r") !== false ||
                strpos($value, "\t") !== false ||
                strpos($value, ' ') !== false) {
            $str2 = $enclosure;
            $escaped = 0;
            $len = strlen($value);
            for ($i=0;$i<$len;$i++) {
                if ($value[$i] == $escape_char) {
                    $escaped = 1;
                } else if (!$escaped && $value[$i] == $enclosure) {
                    $str2 .= $enclosure;
                } else {
                    $escaped = 0;
                }
                $str2 .= $value[$i];
            }
            $str2 .= $enclosure;
            $str .= $str2.$delimiter;
        } else {
            $str .= $value.$delimiter;
        }
    }
    $str = substr($str,0,-1);
    $str .= "\n";

return $str;
}