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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/>.

/**
 * This file contains the course completion badge award criteria type class
 *
 * @package    core
 * @subpackage badges
 * @copyright  2012 onwards Totara Learning Solutions Ltd {@link http://www.totaralms.com/}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @author     Yuliya Bozhko <yuliya.bozhko@totaralms.com>
 */

defined('MOODLE_INTERNAL') || die();
require_once($CFG->libdir . '/completionlib.php');
require_once($CFG->dirroot . '/grade/querylib.php');
require_once($CFG->libdir . '/gradelib.php');

/**
 * Badge award criteria -- award on course completion
 *
 */
class award_criteria_course extends award_criteria {

/* @var int Criteria [BADGE_CRITERIA_TYPE_COURSE] */
    public $criteriatype = BADGE_CRITERIA_TYPE_COURSE;

private $courseid;
    private $course;

public $required_param = 'course';
    public $optional_params = array('grade', 'bydate');

public function __construct($record) {
        global $DB;
        parent::__construct($record);

$this->course = $DB->get_record_sql('SELECT c.id, c.enablecompletion, c.cacherev, c.startdate
                        FROM {badge} b LEFT JOIN {course} c ON b.courseid = c.id
                        WHERE b.id = :badgeid ', array('badgeid' => $this->badgeid), MUST_EXIST);

// If the course doesn't exist but we're sure the badge does (thanks to the LEFT JOIN), then use the site as the course.
        if (empty($this->course->id)) {
            $this->course = get_course(SITEID);
        }
        $this->courseid = $this->course->id;
    }

/**
     * Add appropriate form elements to the criteria form
     *
     * @param moodleform $mform  Moodle forms object
     * @param stdClass $data details of various modules
     */
    public function config_form_criteria($data) {
        global $OUTPUT;

$editurl = new moodle_url('/badges/criteria_settings.php', array('badgeid' => $this->badgeid, 'edit' => true, 'type' => $this->criteriatype, 'crit' => $this->id));
        $deleteurl = new moodle_url('/badges/criteria_action.php', array('badgeid' => $this->badgeid, 'delete' => true, 'type' => $this->criteriatype));
        $editaction = $OUTPUT->action_icon($editurl, new pix_icon('t/edit', get_string('edit')), null, array('class' => 'criteria-action'));
        $deleteaction = $OUTPUT->action_icon($deleteurl, new pix_icon('t/delete', get_string('delete')), null, array('class' => 'criteria-action'));

echo $OUTPUT->box_start();
        if (!$data->is_locked() && !$data->is_active()) {
            echo $OUTPUT->box($deleteaction . $editaction, array('criteria-header'));
        }
        echo $OUTPUT->heading($this->get_title() . $OUTPUT->help_icon('criteria_' . $this->criteriatype, 'badges'), 3, 'main help');

if (!empty($this->description)) {
            echo $OUTPUT->box(
                format_text($this->description, $this->descriptionformat,
                        array('context' => context_course::instance($this->courseid))
                ),
                'criteria-description'
            );
        }

if (!empty($this->params)) {
            echo $OUTPUT->box(get_string('criteria_descr_' . $this->criteriatype, 'badges') . $this->get_details(), array('clearfix'));
        }
        echo $OUTPUT->box_end();
    }

/**
     * Get criteria details for displaying to users
     *
     * @return string
     */
    public function get_details($short = '') {
        global $DB, $OUTPUT;
        $param = reset($this->params);

$course = $DB->get_record('course', array('id' => $param['course']));
        if (!$course) {
            $str = $OUTPUT->error_text(get_string('error:nosuchcourse', 'badges'));
        } else {
            $options = array('context' => context_course::instance($course->id));
            $str = html_writer::tag('b', '"' . format_string($course->fullname, true, $options) . '"');
            if (isset($param['bydate'])) {
                $str .= get_string('criteria_descr_bydate', 'badges', userdate($param['bydate'], get_string('strftimedate', 'core_langconfig')));
            }
            if (isset($param['grade'])) {
                $str .= get_string('criteria_descr_grade', 'badges', $param['grade']);
            }
        }
        return $str;
    }

/**
     * Add appropriate new criteria options to the form
     *
     */
    public function get_options(&$mform) {
        global $DB;
        $param = array();

if ($this->id !== 0) {
            $param = reset($this->params);
        } else {
            $param['course'] = $mform->getElementValue('course');
            $mform->removeElement('course');
        }
        $course = $DB->get_record('course', array('id' => $param['course']));

if (!($course->enablecompletion == COMPLETION_ENABLED)) {
            $none = true;
            $message = get_string('completionnotenabled', 'badges');
        } else {
            $mform->addElement('header', 'criteria_course', $this->get_title());
            $mform->addHelpButton('criteria_course', 'criteria_' . $this->criteriatype, 'badges');
            $parameter = array();
            $parameter[] =& $mform->createElement('static', 'mgrade_', null, get_string('mingrade', 'badges'));
            $parameter[] =& $mform->createElement('text', 'grade_' . $param['course'], '', array('size' => '5'));
            $parameter[] =& $mform->createElement('static', 'complby_' . $param['course'], null, get_string('bydate', 'badges'));
            $parameter[] =& $mform->createElement('date_selector', 'bydate_' . $param['course'], '', array('optional' => true));
            $mform->setType('grade_' . $param['course'], PARAM_INT);
            $mform->addGroup($parameter, 'param_' . $param['course'], '', array(' '), false);

$mform->disabledIf('bydate_' . $param['course'] . '[day]', 'bydate_' . $param['course'] . '[enabled]', 'notchecked');
            $mform->disabledIf('bydate_' . $param['course'] . '[month]', 'bydate_' . $param['course'] . '[enabled]', 'notchecked');
            $mform->disabledIf('bydate_' . $param['course'] . '[year]', 'bydate_' . $param['course'] . '[enabled]', 'notchecked');

// Set existing values.
            if (isset($param['bydate'])) {
                $mform->setDefault('bydate_' . $param['course'], $param['bydate']);
            }

if (isset($param['grade'])) {
                $mform->setDefault('grade_' . $param['course'], $param['grade']);
            }

// Add hidden elements.
            $mform->addElement('hidden', 'course_' . $course->id, $course->id);
            $mform->setType('course_' . $course->id, PARAM_INT);
            $mform->addElement('hidden', 'agg', BADGE_CRITERIA_AGGREGATION_ALL);
            $mform->setType('agg', PARAM_INT);

$none = false;
            $message = '';
        }
        return array($none, $message);
    }

/**
     * Review this criteria and decide if it has been completed
     *
     * @param int $userid User whose criteria completion needs to be reviewed.
     * @param bool $filtered An additional parameter indicating that user list
     *        has been reduced and some expensive checks can be skipped.
     *
     * @return bool Whether criteria is complete
     */
    public function review($userid, $filtered = false) {
        $course = $this->course;

if ($this->course->startdate > time()) {
            return false;
        }

$info = new completion_info($course);

foreach ($this->params as $param) {
            $check_grade = true;
            $check_date = true;

if (isset($param['grade'])) {
                $grade = grade_get_course_grade($userid, $course->id);
                $check_grade = ($grade->grade >= $param['grade']);
            }

if (!$filtered && isset($param['bydate'])) {
                $cparams = array(
                        'userid' => $userid,
                        'course' => $course->id,
                );
                $completion = new completion_completion($cparams);
                $date = $completion->timecompleted;
                $check_date = ($date <= $param['bydate']);
            }

if ($info->is_course_complete($userid) && $check_grade && $check_date) {
                return true;
            }
        }

return false;
    }

/**
     * Returns array with sql code and parameters returning all ids
     * of users who meet this particular criterion.
     *
     * @return array list($join, $where, $params)
     */
    public function get_completed_criteria_sql() {
        // We have only one criterion here, so taking the first one.
        $coursecriteria = reset($this->params);

$join = " LEFT JOIN {course_completions} cc ON cc.userid = u.id AND cc.timecompleted > 0";
        $where = ' AND cc.course = :courseid ';
        $params['courseid'] = $this->courseid;

// Add by date parameter.
        if (isset($param['bydate'])) {
            $where .= ' AND cc.timecompleted <= :completebydate';
            $params['completebydate'] = $coursecriteria['bydate'];
        }

return array($join, $where, $params);
    }
}