C:/xampp/htdocs/moodle/mod/workshop/lib.php

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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/>.

defined('MOODLE_INTERNAL') || die();

// Moodle core API                                                            //

function workshop_supports($feature) {
    switch($feature) {
        case FEATURE_GRADE_HAS_GRADE:   return true;
        case FEATURE_GROUPS:            return true;
        case FEATURE_GROUPINGS:         return true;
        case FEATURE_GROUPMEMBERSONLY:  return true;
        case FEATURE_MOD_INTRO:         return true;
        case FEATURE_BACKUP_MOODLE2:    return true;
        case FEATURE_COMPLETION_TRACKS_VIEWS:
            return true;
        case FEATURE_SHOW_DESCRIPTION:  return true;
        default:                        return null;
    }
}

function workshop_add_instance(stdclass $workshop) {
    global $CFG, $DB;
    require_once(dirname(__FILE__) . '/locallib.php');

    $workshop->phase                = workshop::PHASE_SETUP;
    $workshop->timecreated          = time();
    $workshop->timemodified         = $workshop->timecreated;
    $workshop->useexamples          = (int)!empty($workshop->useexamples);          // unticked checkbox hack
    $workshop->usepeerassessment    = (int)!empty($workshop->usepeerassessment);    // unticked checkbox hack
    $workshop->useselfassessment    = (int)!empty($workshop->useselfassessment);    // unticked checkbox hack
    $workshop->latesubmissions      = (int)!empty($workshop->latesubmissions);      // unticked checkbox hack
    $workshop->evaluation           = 'best';

    // insert the new record so we get the id
    $workshop->id = $DB->insert_record('workshop', $workshop);

    // we need to use context now, so we need to make sure all needed info is already in db
    $cmid = $workshop->coursemodule;
    $DB->set_field('course_modules', 'instance', $workshop->id, array('id' => $cmid));
    $context = get_context_instance(CONTEXT_MODULE, $cmid);

    // process the custom wysiwyg editors
    if ($draftitemid = $workshop->instructauthorseditor['itemid']) {
        $workshop->instructauthors = file_save_draft_area_files($draftitemid, $context->id, 'mod_workshop', 'instructauthors',
                0, workshop::instruction_editors_options($context), $workshop->instructauthorseditor['text']);
        $workshop->instructauthorsformat = $workshop->instructauthorseditor['format'];
    }

    if ($draftitemid = $workshop->instructreviewerseditor['itemid']) {
        $workshop->instructreviewers = file_save_draft_area_files($draftitemid, $context->id, 'mod_workshop', 'instructreviewers',
                0, workshop::instruction_editors_options($context), $workshop->instructreviewerseditor['text']);
        $workshop->instructreviewersformat = $workshop->instructreviewerseditor['format'];
    }

    // re-save the record with the replaced URLs in editor fields
    $DB->update_record('workshop', $workshop);

    // create gradebook items
    workshop_grade_item_update($workshop);
    workshop_grade_item_category_update($workshop);

    return $workshop->id;
}

function workshop_update_instance(stdclass $workshop) {
    global $CFG, $DB;
    require_once(dirname(__FILE__) . '/locallib.php');

    $workshop->timemodified         = time();
    $workshop->id                   = $workshop->instance;
    $workshop->useexamples          = (int)!empty($workshop->useexamples);          // unticked checkbox hack
    $workshop->usepeerassessment    = (int)!empty($workshop->usepeerassessment);    // unticked checkbox hack
    $workshop->useselfassessment    = (int)!empty($workshop->useselfassessment);    // unticked checkbox hack
    $workshop->latesubmissions      = (int)!empty($workshop->latesubmissions);      // unticked checkbox hack
    $workshop->evaluation           = 'best';

    // todo - if the grading strategy is being changed, we must replace all aggregated peer grades with nulls
    // todo - if maximum grades are being changed, we should probably recalculate or invalidate them

    $DB->update_record('workshop', $workshop);
    $context = get_context_instance(CONTEXT_MODULE, $workshop->coursemodule);

    // process the custom wysiwyg editors
    if ($draftitemid = $workshop->instructauthorseditor['itemid']) {
        $workshop->instructauthors = file_save_draft_area_files($draftitemid, $context->id, 'mod_workshop', 'instructauthors',
                0, workshop::instruction_editors_options($context), $workshop->instructauthorseditor['text']);
        $workshop->instructauthorsformat = $workshop->instructauthorseditor['format'];
    }

    if ($draftitemid = $workshop->instructreviewerseditor['itemid']) {
        $workshop->instructreviewers = file_save_draft_area_files($draftitemid, $context->id, 'mod_workshop', 'instructreviewers',
                0, workshop::instruction_editors_options($context), $workshop->instructreviewerseditor['text']);
        $workshop->instructreviewersformat = $workshop->instructreviewerseditor['format'];
    }

    // re-save the record with the replaced URLs in editor fields
    $DB->update_record('workshop', $workshop);

    // update gradebook items
    workshop_grade_item_update($workshop);
    workshop_grade_item_category_update($workshop);

    return true;
}

function workshop_delete_instance($id) {
    global $CFG, $DB;
    require_once($CFG->libdir.'/gradelib.php');

    if (! $workshop = $DB->get_record('workshop', array('id' => $id))) {
        return false;
    }

    // delete all associated aggregations
    $DB->delete_records('workshop_aggregations', array('workshopid' => $workshop->id));

    // get the list of ids of all submissions
    $submissions = $DB->get_records('workshop_submissions', array('workshopid' => $workshop->id), '', 'id');

    // get the list of all allocated assessments
    $assessments = $DB->get_records_list('workshop_assessments', 'submissionid', array_keys($submissions), '', 'id');

    // delete the associated records from the workshop core tables
    $DB->delete_records_list('workshop_grades', 'assessmentid', array_keys($assessments));
    $DB->delete_records_list('workshop_assessments', 'id', array_keys($assessments));
    $DB->delete_records_list('workshop_submissions', 'id', array_keys($submissions));

    // call the static clean-up methods of all available subplugins
    $strategies = get_plugin_list('workshopform');
    foreach ($strategies as $strategy => $path) {
        require_once($path.'/lib.php');
        $classname = 'workshop_'.$strategy.'_strategy';
        call_user_func($classname.'::delete_instance', $workshop->id);
    }

    $allocators = get_plugin_list('workshopallocation');
    foreach ($allocators as $allocator => $path) {
        require_once($path.'/lib.php');
        $classname = 'workshop_'.$allocator.'_allocator';
        call_user_func($classname.'::delete_instance', $workshop->id);
    }

    $evaluators = get_plugin_list('workshopeval');
    foreach ($evaluators as $evaluator => $path) {
        require_once($path.'/lib.php');
        $classname = 'workshop_'.$evaluator.'_evaluation';
        call_user_func($classname.'::delete_instance', $workshop->id);
    }

    // finally remove the workshop record itself
    $DB->delete_records('workshop', array('id' => $workshop->id));

    // gradebook cleanup
    grade_update('mod/workshop', $workshop->course, 'mod', 'workshop', $workshop->id, 0, null, array('deleted' => true));
    grade_update('mod/workshop', $workshop->course, 'mod', 'workshop', $workshop->id, 1, null, array('deleted' => true));

    return true;
}

function workshop_user_outline($course, $user, $mod, $workshop) {
    global $CFG, $DB;
    require_once($CFG->libdir.'/gradelib.php');

    $grades = grade_get_grades($course->id, 'mod', 'workshop', $workshop->id, $user->id);

    $submissiongrade = null;
    $assessmentgrade = null;

    $info = '';
    $time = 0;

    if (!empty($grades->items[0]->grades)) {
        $submissiongrade = reset($grades->items[0]->grades);
        $info .= get_string('submissiongrade', 'workshop') . ': ' . $submissiongrade->str_long_grade . html_writer::empty_tag('br');
        $time = max($time, $submissiongrade->dategraded);
    }
    if (!empty($grades->items[1]->grades)) {
        $assessmentgrade = reset($grades->items[1]->grades);
        $info .= get_string('gradinggrade', 'workshop') . ': ' . $assessmentgrade->str_long_grade;
        $time = max($time, $assessmentgrade->dategraded);
    }

    if (!empty($info) and !empty($time)) {
        $return = new stdclass();
        $return->time = $time;
        $return->info = $info;
        return $return;
    }

    return null;
}

function workshop_user_complete($course, $user, $mod, $workshop) {
    global $CFG, $DB, $OUTPUT;
    require_once(dirname(__FILE__).'/locallib.php');
    require_once($CFG->libdir.'/gradelib.php');

    $workshop   = new workshop($workshop, $mod, $course);
    $grades     = grade_get_grades($course->id, 'mod', 'workshop', $workshop->id, $user->id);

    if (!empty($grades->items[0]->grades)) {
        $submissiongrade = reset($grades->items[0]->grades);
        $info = get_string('submissiongrade', 'workshop') . ': ' . $submissiongrade->str_long_grade;
        echo html_writer::tag('li', $info, array('class'=>'submissiongrade'));
    }
    if (!empty($grades->items[1]->grades)) {
        $assessmentgrade = reset($grades->items[1]->grades);
        $info = get_string('gradinggrade', 'workshop') . ': ' . $assessmentgrade->str_long_grade;
        echo html_writer::tag('li', $info, array('class'=>'gradinggrade'));
    }

    if (has_capability('mod/workshop:viewallsubmissions', $workshop->context)) {
        if ($submission = $workshop->get_submission_by_author($user->id)) {
            $title      = format_string($submission->title);
            $url        = $workshop->submission_url($submission->id);
            $link       = html_writer::link($url, $title);
            $info       = get_string('submission', 'workshop').': '.$link;
            echo html_writer::tag('li', $info, array('class'=>'submission'));
        }
    }

    if (has_capability('mod/workshop:viewallassessments', $workshop->context)) {
        if ($assessments = $workshop->get_assessments_by_reviewer($user->id)) {
            foreach ($assessments as $assessment) {
                $a = new stdclass();
                $a->submissionurl = $workshop->submission_url($assessment->submissionid)->out();
                $a->assessmenturl = $workshop->assess_url($assessment->id)->out();
                $a->submissiontitle = s($assessment->submissiontitle);
                echo html_writer::tag('li', get_string('assessmentofsubmission', 'workshop', $a));
            }
        }
    }
}

function workshop_print_recent_activity($course, $viewfullnames, $timestart) {
    global $CFG, $USER, $DB, $OUTPUT;

    $sql = "SELECT s.id AS submissionid, s.title AS submissiontitle, s.timemodified AS submissionmodified,
                   author.id AS authorid, author.lastname AS authorlastname, author.firstname AS authorfirstname,
                   a.id AS assessmentid, a.timemodified AS assessmentmodified,
                   reviewer.id AS reviewerid, reviewer.lastname AS reviewerlastname, reviewer.firstname AS reviewerfirstname,
                   cm.id AS cmid
              FROM {workshop} w
        INNER JOIN {course_modules} cm ON cm.instance = w.id
        INNER JOIN {modules} md ON md.id = cm.module
        INNER JOIN {workshop_submissions} s ON s.workshopid = w.id
        INNER JOIN {user} author ON s.authorid = author.id
         LEFT JOIN {workshop_assessments} a ON a.submissionid = s.id
         LEFT JOIN {user} reviewer ON a.reviewerid = reviewer.id
             WHERE cm.course = ?
                   AND md.name = 'workshop'
                   AND s.example = 0
                   AND (s.timemodified > ? OR a.timemodified > ?)";

    $rs = $DB->get_recordset_sql($sql, array($course->id, $timestart, $timestart));

    $modinfo =& get_fast_modinfo($course); // reference needed because we might load the groups

    $submissions = array(); // recent submissions indexed by submission id
    $assessments = array(); // recent assessments indexed by assessment id
    $users       = array();

    foreach ($rs as $activity) {
        if (!array_key_exists($activity->cmid, $modinfo->cms)) {
            // this should not happen but just in case
            continue;
        }

        $cm = $modinfo->cms[$activity->cmid];
        if (!$cm->uservisible) {
            continue;
        }

        if ($viewfullnames) {
            // remember all user names we can use later
            if (empty($users[$activity->authorid])) {
                $u = new stdclass();
                $u->lastname = $activity->authorlastname;
                $u->firstname = $activity->authorfirstname;
                $users[$activity->authorid] = $u;
            }
            if ($activity->reviewerid and empty($users[$activity->reviewerid])) {
                $u = new stdclass();
                $u->lastname = $activity->reviewerlastname;
                $u->firstname = $activity->reviewerfirstname;
                $users[$activity->reviewerid] = $u;
            }
        }

        $context = get_context_instance(CONTEXT_MODULE, $cm->id);
        $groupmode = groups_get_activity_groupmode($cm, $course);

        if ($activity->submissionmodified > $timestart and empty($submissions[$activity->submissionid])) {
            $s = new stdclass();
            $s->title = $activity->submissiontitle;
            $s->authorid = $activity->authorid;
            $s->timemodified = $activity->submissionmodified;
            $s->cmid = $activity->cmid;
            if (has_capability('mod/workshop:viewauthornames', $context)) {
                $s->authornamevisible = true;
            } else {
                $s->authornamevisible = false;
            }

            // the following do-while wrapper allows to break from deeply nested if-statements
            do {
                if ($s->authorid === $USER->id) {
                    // own submissions always visible
                    $submissions[$activity->submissionid] = $s;
                    break;
                }

                if (has_capability('mod/workshop:viewallsubmissions', $context)) {
                    if ($groupmode == SEPARATEGROUPS and !has_capability('moodle/site:accessallgroups', $context)) {
                        if (isguestuser()) {
                            // shortcut - guest user does not belong into any group
                            break;
                        }

                        if (is_null($modinfo->groups)) {
                            $modinfo->groups = groups_get_user_groups($course->id); // load all my groups and cache it in modinfo
                        }

                        // this might be slow - show only submissions by users who share group with me in this cm
                        if (empty($modinfo->groups[$cm->id])) {
                            break;
                        }
                        $authorsgroups = groups_get_all_groups($course->id, $s->authorid, $cm->groupingid);
                        if (is_array($authorsgroups)) {
                            $authorsgroups = array_keys($authorsgroups);
                            $intersect = array_intersect($authorsgroups, $modinfo->groups[$cm->id]);
                            if (empty($intersect)) {
                                break;
                            } else {
                                // can see all submissions and shares a group with the author
                                $submissions[$activity->submissionid] = $s;
                                break;
                            }
                        }

                    } else {
                        // can see all submissions from all groups
                        $submissions[$activity->submissionid] = $s;
                    }
                }
            } while (0);
        }

        if ($activity->assessmentmodified > $timestart and empty($assessments[$activity->assessmentid])) {
            $a = new stdclass();
            $a->submissionid = $activity->submissionid;
            $a->submissiontitle = $activity->submissiontitle;
            $a->reviewerid = $activity->reviewerid;
            $a->timemodified = $activity->assessmentmodified;
            $a->cmid = $activity->cmid;
            if (has_capability('mod/workshop:viewreviewernames', $context)) {
                $a->reviewernamevisible = true;
            } else {
                $a->reviewernamevisible = false;
            }

            // the following do-while wrapper allows to break from deeply nested if-statements
            do {
                if ($a->reviewerid === $USER->id) {
                    // own assessments always visible
                    $assessments[$activity->assessmentid] = $a;
                    break;
                }

                if (has_capability('mod/workshop:viewallassessments', $context)) {
                    if ($groupmode == SEPARATEGROUPS and !has_capability('moodle/site:accessallgroups', $context)) {
                        if (isguestuser()) {
                            // shortcut - guest user does not belong into any group
                            break;
                        }

                        if (is_null($modinfo->groups)) {
                            $modinfo->groups = groups_get_user_groups($course->id); // load all my groups and cache it in modinfo
                        }

                        // this might be slow - show only submissions by users who share group with me in this cm
                        if (empty($modinfo->groups[$cm->id])) {
                            break;
                        }
                        $reviewersgroups = groups_get_all_groups($course->id, $a->reviewerid, $cm->groupingid);
                        if (is_array($reviewersgroups)) {
                            $reviewersgroups = array_keys($reviewersgroups);
                            $intersect = array_intersect($reviewersgroups, $modinfo->groups[$cm->id]);
                            if (empty($intersect)) {
                                break;
                            } else {
                                // can see all assessments and shares a group with the reviewer
                                $assessments[$activity->assessmentid] = $a;
                                break;
                            }
                        }

                    } else {
                        // can see all assessments from all groups
                        $assessments[$activity->assessmentid] = $a;
                    }
                }
            } while (0);
        }
    }
    $rs->close();

    $shown = false;

    if (!empty($submissions)) {
        $shown = true;
        echo $OUTPUT->heading(get_string('recentsubmissions', 'workshop'), 3);
        foreach ($submissions as $id => $submission) {
            $link = new moodle_url('/mod/workshop/submission.php', array('id'=>$id, 'cmid'=>$submission->cmid));
            if ($viewfullnames and $submission->authornamevisible) {
                $author = $users[$submission->authorid];
            } else {
                $author = null;
            }
            print_recent_activity_note($submission->timemodified, $author, $submission->title, $link->out(), false, $viewfullnames);
        }
    }

    if (!empty($assessments)) {
        $shown = true;
        echo $OUTPUT->heading(get_string('recentassessments', 'workshop'), 3);
        foreach ($assessments as $id => $assessment) {
            $link = new moodle_url('/mod/workshop/assessment.php', array('asid' => $id));
            if ($viewfullnames and $assessment->reviewernamevisible) {
                $reviewer = $users[$assessment->reviewerid];
            } else {
                $reviewer = null;
            }
            print_recent_activity_note($assessment->timemodified, $reviewer, $assessment->submissiontitle, $link->out(), false, $viewfullnames);
        }
    }

    if ($shown) {
        return true;
    }

    return false;
}

function workshop_get_recent_mod_activity(&$activities, &$index, $timestart, $courseid, $cmid, $userid=0, $groupid=0) {
    global $CFG, $COURSE, $USER, $DB;

    if ($COURSE->id == $courseid) {
        $course = $COURSE;
    } else {
        $course = $DB->get_record('course', array('id'=>$courseid));
    }

    $modinfo =& get_fast_modinfo($course);

    $cm = $modinfo->cms[$cmid];

    $params = array();
    if ($userid) {
        $userselect = "AND (author.id = :authorid OR reviewer.id = :reviewerid)";
        $params['authorid'] = $userid;
        $params['reviewerid'] = $userid;
    } else {
        $userselect = "";
    }

    if ($groupid) {
        $groupselect = "AND (authorgroupmembership.groupid = :authorgroupid OR reviewergroupmembership.groupid = :reviewergroupid)";
        $groupjoin   = "LEFT JOIN {groups_members} authorgroupmembership ON authorgroumembership.userid = author.id
                        LEFT JOIN {groups_members} reviewergroupmembership ON reviewergroumembership.userid = reviewer.id";
        $params['authorgroupid'] = $groupid;
        $params['reviewergroupid'] = $groupid;
    } else {
        $groupselect = "";
        $groupjoin   = "";
    }

    $params['cminstance'] = $cm->instance;
    $params['submissionmodified'] = $timestart;
    $params['assessmentmodified'] = $timestart;

    $sql = "SELECT s.id AS submissionid, s.title AS submissiontitle, s.timemodified AS submissionmodified,
                   author.id AS authorid, author.lastname AS authorlastname, author.firstname AS authorfirstname,
                   author.picture AS authorpicture, author.imagealt AS authorimagealt, author.email AS authoremail,
                   a.id AS assessmentid, a.timemodified AS assessmentmodified,
                   reviewer.id AS reviewerid, reviewer.lastname AS reviewerlastname, reviewer.firstname AS reviewerfirstname,
                   reviewer.picture AS reviewerpicture, reviewer.imagealt AS reviewerimagealt, reviewer.email AS revieweremail
              FROM {workshop_submissions} s
        INNER JOIN {workshop} w ON s.workshopid = w.id
        INNER JOIN {user} author ON s.authorid = author.id
         LEFT JOIN {workshop_assessments} a ON a.submissionid = s.id
         LEFT JOIN {user} reviewer ON a.reviewerid = reviewer.id
        $groupjoin
             WHERE w.id = :cminstance
                   AND s.example = 0
                   $userselect $groupselect
                   AND (s.timemodified > :submissionmodified OR a.timemodified > :assessmentmodified)
          ORDER BY s.timemodified ASC, a.timemodified ASC";

    $rs = $DB->get_recordset_sql($sql, $params);

    $groupmode       = groups_get_activity_groupmode($cm, $course);
    $context         = get_context_instance(CONTEXT_MODULE, $cm->id);
    $grader          = has_capability('moodle/grade:viewall', $context);
    $accessallgroups = has_capability('moodle/site:accessallgroups', $context);
    $viewfullnames   = has_capability('moodle/site:viewfullnames', $context);
    $viewauthors     = has_capability('mod/workshop:viewauthornames', $context);
    $viewreviewers   = has_capability('mod/workshop:viewreviewernames', $context);

    if (is_null($modinfo->groups)) {
        $modinfo->groups = groups_get_user_groups($course->id); // load all my groups and cache it in modinfo
    }

    $submissions = array(); // recent submissions indexed by submission id
    $assessments = array(); // recent assessments indexed by assessment id
    $users       = array();

    foreach ($rs as $activity) {

        if ($viewfullnames) {
            // remember all user names we can use later
            if (empty($users[$activity->authorid])) {
                $u = new stdclass();
                $u->id = $activity->authorid;
                $u->lastname = $activity->authorlastname;
                $u->firstname = $activity->authorfirstname;
                $u->picture = $activity->authorpicture;
                $u->imagealt = $activity->authorimagealt;
                $u->email = $activity->authoremail;
                $users[$activity->authorid] = $u;
            }
            if ($activity->reviewerid and empty($users[$activity->reviewerid])) {
                $u = new stdclass();
                $u->id = $activity->reviewerid;
                $u->lastname = $activity->reviewerlastname;
                $u->firstname = $activity->reviewerfirstname;
                $u->picture = $activity->reviewerpicture;
                $u->imagealt = $activity->reviewerimagealt;
                $u->email = $activity->revieweremail;
                $users[$activity->reviewerid] = $u;
            }
        }

        if ($activity->submissionmodified > $timestart and empty($submissions[$activity->submissionid])) {
            $s = new stdclass();
            $s->id = $activity->submissionid;
            $s->title = $activity->submissiontitle;
            $s->authorid = $activity->authorid;
            $s->timemodified = $activity->submissionmodified;
            if (has_capability('mod/workshop:viewauthornames', $context)) {
                $s->authornamevisible = true;
            } else {
                $s->authornamevisible = false;
            }

            // the following do-while wrapper allows to break from deeply nested if-statements
            do {
                if ($s->authorid === $USER->id) {
                    // own submissions always visible
                    $submissions[$activity->submissionid] = $s;
                    break;
                }

                if (has_capability('mod/workshop:viewallsubmissions', $context)) {
                    if ($groupmode == SEPARATEGROUPS and !has_capability('moodle/site:accessallgroups', $context)) {
                        if (isguestuser()) {
                            // shortcut - guest user does not belong into any group
                            break;
                        }

                        // this might be slow - show only submissions by users who share group with me in this cm
                        if (empty($modinfo->groups[$cm->id])) {
                            break;
                        }
                        $authorsgroups = groups_get_all_groups($course->id, $s->authorid, $cm->groupingid);
                        if (is_array($authorsgroups)) {
                            $authorsgroups = array_keys($authorsgroups);
                            $intersect = array_intersect($authorsgroups, $modinfo->groups[$cm->id]);
                            if (empty($intersect)) {
                                break;
                            } else {
                                // can see all submissions and shares a group with the author
                                $submissions[$activity->submissionid] = $s;
                                break;
                            }
                        }

                    } else {
                        // can see all submissions from all groups
                        $submissions[$activity->submissionid] = $s;
                    }
                }
            } while (0);
        }

        if ($activity->assessmentmodified > $timestart and empty($assessments[$activity->assessmentid])) {
            $a = new stdclass();
            $a->id = $activity->assessmentid;
            $a->submissionid = $activity->submissionid;
            $a->submissiontitle = $activity->submissiontitle;
            $a->reviewerid = $activity->reviewerid;
            $a->timemodified = $activity->assessmentmodified;
            if (has_capability('mod/workshop:viewreviewernames', $context)) {
                $a->reviewernamevisible = true;
            } else {
                $a->reviewernamevisible = false;
            }

            // the following do-while wrapper allows to break from deeply nested if-statements
            do {
                if ($a->reviewerid === $USER->id) {
                    // own assessments always visible
                    $assessments[$activity->assessmentid] = $a;
                    break;
                }

                if (has_capability('mod/workshop:viewallassessments', $context)) {
                    if ($groupmode == SEPARATEGROUPS and !has_capability('moodle/site:accessallgroups', $context)) {
                        if (isguestuser()) {
                            // shortcut - guest user does not belong into any group
                            break;
                        }

                        // this might be slow - show only submissions by users who share group with me in this cm
                        if (empty($modinfo->groups[$cm->id])) {
                            break;
                        }
                        $reviewersgroups = groups_get_all_groups($course->id, $a->reviewerid, $cm->groupingid);
                        if (is_array($reviewersgroups)) {
                            $reviewersgroups = array_keys($reviewersgroups);
                            $intersect = array_intersect($reviewersgroups, $modinfo->groups[$cm->id]);
                            if (empty($intersect)) {
                                break;
                            } else {
                                // can see all assessments and shares a group with the reviewer
                                $assessments[$activity->assessmentid] = $a;
                                break;
                            }
                        }

                    } else {
                        // can see all assessments from all groups
                        $assessments[$activity->assessmentid] = $a;
                    }
                }
            } while (0);
        }
    }
    $rs->close();

    $workshopname = format_string($cm->name, true);

    if ($grader) {
        require_once($CFG->libdir.'/gradelib.php');
        $grades = grade_get_grades($courseid, 'mod', 'workshop', $cm->instance, array_keys($users));
    }

    foreach ($submissions as $submission) {
        $tmpactivity                = new stdclass();
        $tmpactivity->type          = 'workshop';
        $tmpactivity->cmid          = $cm->id;
        $tmpactivity->name          = $workshopname;
        $tmpactivity->sectionnum    = $cm->sectionnum;
        $tmpactivity->timestamp     = $submission->timemodified;
        $tmpactivity->subtype       = 'submission';
        $tmpactivity->content       = $submission;
        if ($grader) {
            $tmpactivity->grade     = $grades->items[0]->grades[$submission->authorid]->str_long_grade;
        }
        if ($submission->authornamevisible and !empty($users[$submission->authorid])) {
            $tmpactivity->user      = $users[$submission->authorid];
        }
        $activities[$index++]       = $tmpactivity;
    }

    foreach ($assessments as $assessment) {
        $tmpactivity                = new stdclass();
        $tmpactivity->type          = 'workshop';
        $tmpactivity->cmid          = $cm->id;
        $tmpactivity->name          = $workshopname;
        $tmpactivity->sectionnum    = $cm->sectionnum;
        $tmpactivity->timestamp     = $assessment->timemodified;
        $tmpactivity->subtype       = 'assessment';
        $tmpactivity->content       = $assessment;
        if ($grader) {
            $tmpactivity->grade     = $grades->items[1]->grades[$assessment->reviewerid]->str_long_grade;
        }
        if ($assessment->reviewernamevisible and !empty($users[$assessment->reviewerid])) {
            $tmpactivity->user      = $users[$assessment->reviewerid];
        }
        $activities[$index++]       = $tmpactivity;
    }
}

function workshop_print_recent_mod_activity($activity, $courseid, $detail, $modnames, $viewfullnames) {
    global $CFG, $OUTPUT;

    if (!empty($activity->user)) {
        echo html_writer::tag('div', $OUTPUT->user_picture($activity->user, array('courseid'=>$courseid)),
                array('style' => 'float: left; padding: 7px;'));
    }

    if ($activity->subtype == 'submission') {
        echo html_writer::start_tag('div', array('class'=>'submission', 'style'=>'padding: 7px; float:left;'));

        if ($detail) {
            echo html_writer::start_tag('h4', array('class'=>'workshop'));
            $url = new moodle_url('/mod/workshop/view.php', array('id'=>$activity->cmid));
            $name = s($activity->name);
            echo html_writer::empty_tag('img', array('src'=>$OUTPUT->pix_url('icon', $activity->type), 'class'=>'icon', 'alt'=>$name));
            echo ' ' . $modnames[$activity->type];
            echo html_writer::link($url, $name, array('class'=>'name', 'style'=>'margin-left: 5px'));
            echo html_writer::end_tag('h4');
        }

        echo html_writer::start_tag('div', array('class'=>'title'));
        $url = new moodle_url('/mod/workshop/submission.php', array('cmid'=>$activity->cmid, 'id'=>$activity->content->id));
        $name = s($activity->content->title);
        echo html_writer::tag('strong', html_writer::link($url, $name));
        echo html_writer::end_tag('div');

        if (!empty($activity->user)) {
            echo html_writer::start_tag('div', array('class'=>'user'));
            $url = new moodle_url('/user/view.php', array('id'=>$activity->user->id, 'course'=>$courseid));
            $name = fullname($activity->user);
            $link = html_writer::link($url, $name);
            echo get_string('submissionby', 'workshop', $link);
            echo ' - '.userdate($activity->timestamp);
            echo html_writer::end_tag('div');
        } else {
            echo html_writer::start_tag('div', array('class'=>'anonymous'));
            echo get_string('submission', 'workshop');
            echo ' - '.userdate($activity->timestamp);
            echo html_writer::end_tag('div');
        }

        echo html_writer::end_tag('div');
    }

    if ($activity->subtype == 'assessment') {
        echo html_writer::start_tag('div', array('class'=>'assessment', 'style'=>'padding: 7px; float:left;'));

        if ($detail) {
            echo html_writer::start_tag('h4', array('class'=>'workshop'));
            $url = new moodle_url('/mod/workshop/view.php', array('id'=>$activity->cmid));
            $name = s($activity->name);
            echo html_writer::empty_tag('img', array('src'=>$OUTPUT->pix_url('icon', $activity->type), 'class'=>'icon', 'alt'=>$name));
            echo ' ' . $modnames[$activity->type];
            echo html_writer::link($url, $name, array('class'=>'name', 'style'=>'margin-left: 5px'));
            echo html_writer::end_tag('h4');
        }

        echo html_writer::start_tag('div', array('class'=>'title'));
        $url = new moodle_url('/mod/workshop/assessment.php', array('asid'=>$activity->content->id));
        $name = s($activity->content->submissiontitle);
        echo html_writer::tag('em', html_writer::link($url, $name));
        echo html_writer::end_tag('div');

        if (!empty($activity->user)) {
            echo html_writer::start_tag('div', array('class'=>'user'));
            $url = new moodle_url('/user/view.php', array('id'=>$activity->user->id, 'course'=>$courseid));
            $name = fullname($activity->user);
            $link = html_writer::link($url, $name);
            echo get_string('assessmentbyfullname', 'workshop', $link);
            echo ' - '.userdate($activity->timestamp);
            echo html_writer::end_tag('div');
        } else {
            echo html_writer::start_tag('div', array('class'=>'anonymous'));
            echo get_string('assessment', 'workshop');
            echo ' - '.userdate($activity->timestamp);
            echo html_writer::end_tag('div');
        }

        echo html_writer::end_tag('div');
    }

    echo html_writer::empty_tag('br', array('style'=>'clear:both'));
}

function workshop_cron () {
    return true;
}

function workshop_get_participants($workshopid) {
    global $DB;

    $sql = "SELECT u.id
              FROM {workshop} w
              JOIN {workshop_submissions} s ON s.workshopid = w.id
              JOIN {user} u ON s.authorid = u.id
             WHERE w.id = ? AND s.example = 0

             UNION

            SELECT u.id
              FROM {workshop} w
              JOIN {workshop_submissions} s ON s.workshopid = w.id
              JOIN {workshop_assessments} a ON a.submissionid = s.id
              JOIN {user} u ON a.reviewerid = u.id
             WHERE w.id = ? AND (s.example = 0 OR a.weight = 0)";

    $users = array();
    $rs = $DB->get_recordset_sql($sql, array($workshopid, $workshopid));
    foreach ($rs as $user) {
        if (empty($users[$user->id])) {
            $users[$user->id] = $user;
        }
    }
    $rs->close();

    return $users;
}

function workshop_scale_used($workshopid, $scaleid) {
    global $CFG; // other files included from here

    $strategies = get_plugin_list('workshopform');
    foreach ($strategies as $strategy => $strategypath) {
        $strategylib = $strategypath . '/lib.php';
        if (is_readable($strategylib)) {
            require_once($strategylib);
        } else {
            throw new coding_exception('the grading forms subplugin must contain library ' . $strategylib);
        }
        $classname = 'workshop_' . $strategy . '_strategy';
        if (method_exists($classname, 'scale_used')) {
            if (call_user_func_array(array($classname, 'scale_used'), array($scaleid, $workshopid))) {
                // no need to include any other files - scale is used
                return true;
            }
        }
    }

    return false;
}

function workshop_scale_used_anywhere($scaleid) {
    global $CFG; // other files included from here

    $strategies = get_plugin_list('workshopform');
    foreach ($strategies as $strategy => $strategypath) {
        $strategylib = $strategypath . '/lib.php';
        if (is_readable($strategylib)) {
            require_once($strategylib);
        } else {
            throw new coding_exception('the grading forms subplugin must contain library ' . $strategylib);
        }
        $classname = 'workshop_' . $strategy . '_strategy';
        if (method_exists($classname, 'scale_used')) {
            if (call_user_func(array($classname, 'scale_used'), $scaleid)) {
                // no need to include any other files - scale is used
                return true;
            }
        }
    }

    return false;
}

function workshop_get_extra_capabilities() {
    return array('moodle/site:accessallgroups');
}

// Gradebook API                                                              //

function workshop_grade_item_update(stdclass $workshop, $submissiongrades=null, $assessmentgrades=null) {
    global $CFG;
    require_once($CFG->libdir.'/gradelib.php');

    $a = new stdclass();
    $a->workshopname = clean_param($workshop->name, PARAM_NOTAGS);

    $item = array();
    $item['itemname'] = get_string('gradeitemsubmission', 'workshop', $a);
    $item['gradetype'] = GRADE_TYPE_VALUE;
    $item['grademax']  = $workshop->grade;
    $item['grademin']  = 0;
    grade_update('mod/workshop', $workshop->course, 'mod', 'workshop', $workshop->id, 0, $submissiongrades , $item);

    $item = array();
    $item['itemname'] = get_string('gradeitemassessment', 'workshop', $a);
    $item['gradetype'] = GRADE_TYPE_VALUE;
    $item['grademax']  = $workshop->gradinggrade;
    $item['grademin']  = 0;
    grade_update('mod/workshop', $workshop->course, 'mod', 'workshop', $workshop->id, 1, $assessmentgrades, $item);
}

function workshop_update_grades(stdclass $workshop, $userid=0) {
    global $CFG, $DB;
    require_once($CFG->libdir.'/gradelib.php');

    $whereuser = $userid ? ' AND authorid = :userid' : '';
    $params = array('workshopid' => $workshop->id, 'userid' => $userid);
    $sql = 'SELECT authorid, grade, gradeover, gradeoverby, feedbackauthor, feedbackauthorformat, timemodified, timegraded
              FROM {workshop_submissions}
             WHERE workshopid = :workshopid AND example=0' . $whereuser;
    $records = $DB->get_records_sql($sql, $params);
    $submissiongrades = array();
    foreach ($records as $record) {
        $grade = new stdclass();
        $grade->userid = $record->authorid;
        if (!is_null($record->gradeover)) {
            $grade->rawgrade = grade_floatval($workshop->grade * $record->gradeover / 100);
            $grade->usermodified = $record->gradeoverby;
        } else {
            $grade->rawgrade = grade_floatval($workshop->grade * $record->grade / 100);
        }
        $grade->feedback = $record->feedbackauthor;
        $grade->feedbackformat = $record->feedbackauthorformat;
        $grade->datesubmitted = $record->timemodified;
        $grade->dategraded = $record->timegraded;
        $submissiongrades[$record->authorid] = $grade;
    }

    $whereuser = $userid ? ' AND userid = :userid' : '';
    $params = array('workshopid' => $workshop->id, 'userid' => $userid);
    $sql = 'SELECT userid, gradinggrade, timegraded
              FROM {workshop_aggregations}
             WHERE workshopid = :workshopid' . $whereuser;
    $records = $DB->get_records_sql($sql, $params);
    $assessmentgrades = array();
    foreach ($records as $record) {
        $grade = new stdclass();
        $grade->userid = $record->userid;
        $grade->rawgrade = grade_floatval($workshop->gradinggrade * $record->gradinggrade / 100);
        $grade->dategraded = $record->timegraded;
        $assessmentgrades[$record->userid] = $grade;
    }

    workshop_grade_item_update($workshop, $submissiongrades, $assessmentgrades);
}

function workshop_grade_item_category_update($workshop) {

    $gradeitems = grade_item::fetch_all(array(
        'itemtype'      => 'mod',
        'itemmodule'    => 'workshop',
        'iteminstance'  => $workshop->id,
        'courseid'      => $workshop->course));

    if (!empty($gradeitems)) {
        foreach ($gradeitems as $gradeitem) {
            if ($gradeitem->itemnumber == 0) {
                if ($gradeitem->categoryid != $workshop->gradecategory) {
                    $gradeitem->set_parent($workshop->gradecategory);
                }
            } else if ($gradeitem->itemnumber == 1) {
                if ($gradeitem->categoryid != $workshop->gradinggradecategory) {
                    $gradeitem->set_parent($workshop->gradinggradecategory);
                }
            }
        }
    }
}

// File API                                                                   //

function workshop_get_file_areas($course, $cm, $context) {
    $areas = array();
    $areas['instructauthors']          = get_string('areainstructauthors', 'workshop');
    $areas['instructreviewers']        = get_string('areainstructreviewers', 'workshop');
    $areas['submission_content']       = get_string('areasubmissioncontent', 'workshop');
    $areas['submission_attachment']    = get_string('areasubmissionattachment', 'workshop');

    return $areas;
}

function workshop_pluginfile($course, $cm, $context, $filearea, array $args, $forcedownload) {
    global $DB, $CFG;

    if ($context->contextlevel != CONTEXT_MODULE) {
        return false;
    }

    require_login($course, true, $cm);

    if ($filearea === 'instructauthors') {
        // submission instructions may contain sensitive data
        if (!has_any_capability(array('moodle/course:manageactivities', 'mod/workshop:submit'), $context)) {
            send_file_not_found();
        }

        array_shift($args); // we do not use itemids here
        $relativepath = implode('/', $args);
        $fullpath = "/$context->id/mod_workshop/$filearea/0/$relativepath"; // beware, slashes are not used here!

        $fs = get_file_storage();
        if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
            send_file_not_found();
        }

        $lifetime = isset($CFG->filelifetime) ? $CFG->filelifetime : 86400;

        // finally send the file
        send_stored_file($file, $lifetime, 0);
    }

    if ($filearea === 'instructreviewers') {
        // submission instructions may contain sensitive data
        if (!has_any_capability(array('moodle/course:manageactivities', 'mod/workshop:peerassess'), $context)) {
            send_file_not_found();
        }

        array_shift($args); // we do not use itemids here
        $relativepath = implode('/', $args);
        $fullpath = "/$context->id/mod_workshop/$filearea/0/$relativepath";

        $fs = get_file_storage();
        if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
            send_file_not_found();
        }

        $lifetime = isset($CFG->filelifetime) ? $CFG->filelifetime : 86400;

        // finally send the file
        send_stored_file($file, $lifetime, 0);

    } else if ($filearea === 'submission_content' or $filearea === 'submission_attachment') {
        $itemid = (int)array_shift($args);
        if (!$workshop = $DB->get_record('workshop', array('id' => $cm->instance))) {
            return false;
        }
        if (!$submission = $DB->get_record('workshop_submissions', array('id' => $itemid, 'workshopid' => $workshop->id))) {
            return false;
        }
        // TODO now make sure the user is allowed to see the file
        $fs = get_file_storage();
        $relativepath = implode('/', $args);
        $fullpath = "/$context->id/mod_workshop/$filearea/$itemid/$relativepath";
        if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
            return false;
        }
        // finally send the file
        // these files are uploaded by students - forcing download for security reasons
        send_stored_file($file, 0, 0, true);
    }

    return false;
}

function workshop_get_file_info($browser, $areas, $course, $cm, $context, $filearea, $itemid, $filepath, $filename) {
    global $CFG, $DB;

    if (!has_capability('moodle/course:managefiles', $context)) {
        return null;
    }

    $fs = get_file_storage();

    if ($filearea === 'content' or $filearea === 'attachment') {

        if (is_null($itemid)) {
            require_once($CFG->dirroot . '/mod/workshop/fileinfolib.php');
            return new workshop_file_info_submissions_container($browser, $course, $cm, $context, $areas, $filearea);
        }

        // we are inside the submission container

        $filepath = is_null($filepath) ? '/' : $filepath;
        $filename = is_null($filename) ? '.' : $filename;

        if (!$storedfile = $fs->get_file($context->id, 'mod_workshop', $filearea, $itemid, $filepath, $filename)) {
            if ($filepath === '/' and $filename === '.') {
                $storedfile = new virtual_root_file($context->id, 'mod_workshop', $filearea, $itemid);
            } else {
                // not found
                return null;
            }
        }

        // let us display the author's name instead of itemid (submission id)
        // todo some sort of caching should happen here

        $sql = "SELECT s.id, u.lastname, u.firstname
                  FROM {workshop_submissions} s
            INNER JOIN {user} u ON (s.authorid = u.id)
                 WHERE s.workshopid = ?";
        $params         = array($cm->instance);
        $authors        = $DB->get_records_sql($sql, $params);
        $urlbase        = $CFG->wwwroot . '/pluginfile.php';
        $topvisiblename = fullname($authors[$itemid]);
        // do not allow manual modification of any files!
        return new file_info_stored($browser, $context, $storedfile, $urlbase, $topvisiblename, true, true, false, false);
    }

    if ($filearea == 'instructauthors' or $filearea == 'instructreviewers') {
        // always only itemid 0

        $filepath = is_null($filepath) ? '/' : $filepath;
        $filename = is_null($filename) ? '.' : $filename;

        $urlbase = $CFG->wwwroot.'/pluginfile.php';
        if (!$storedfile = $fs->get_file($context->id, 'mod_workshop', $filearea, 0, $filepath, $filename)) {
            if ($filepath === '/' and $filename === '.') {
                $storedfile = new virtual_root_file($context->id, 'mod_workshop', $filearea, 0);
            } else {
                // not found
                return null;
            }
        }
        return new file_info_stored($browser, $context, $storedfile, $urlbase, $areas[$filearea], false, true, true, false);
    }
}

// Navigation API                                                             //

function workshop_extend_navigation(navigation_node $navref, stdclass $course, stdclass $module, cm_info $cm) {
    global $CFG;

    if (has_capability('mod/workshop:submit', get_context_instance(CONTEXT_MODULE, $cm->id))) {
        $url = new moodle_url('/mod/workshop/submission.php', array('cmid' => $cm->id));
        $mysubmission = $navref->add(get_string('mysubmission', 'workshop'), $url);
        $mysubmission->mainnavonly = true;
    }
}

function workshop_extend_settings_navigation(settings_navigation $settingsnav, navigation_node $workshopnode=null) {
    global $PAGE;

    //$workshopobject = $DB->get_record("workshop", array("id" => $PAGE->cm->instance));

    if (has_capability('mod/workshop:editdimensions', $PAGE->cm->context)) {
        $url = new moodle_url('/mod/workshop/editform.php', array('cmid' => $PAGE->cm->id));
        $workshopnode->add(get_string('editassessmentform', 'workshop'), $url, settings_navigation::TYPE_SETTING);
    }
    if (has_capability('mod/workshop:allocate', $PAGE->cm->context)) {
        $url = new moodle_url('/mod/workshop/allocation.php', array('cmid' => $PAGE->cm->id));
        $workshopnode->add(get_string('allocate', 'workshop'), $url, settings_navigation::TYPE_SETTING);
    }
}

function workshop_page_type_list($pagetype, $parentcontext, $currentcontext) {
    $module_pagetype = array('mod-workshop-*'=>get_string('page-mod-workshop-x', 'workshop'));
    return $module_pagetype;
}