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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/>.

/**
 * Participation report
 *
 * @package    report
 * @subpackage participation
 * @copyright  1999 onwards Martin Dougiamas  {@link http://moodle.com}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

use core\report_helper;

require('../../config.php');
require_once($CFG->dirroot.'/lib/tablelib.php');
require_once($CFG->dirroot.'/notes/lib.php');
require_once($CFG->dirroot.'/report/participation/locallib.php');

$participantsperpage = intval(get_config('moodlecourse', 'participantsperpage'));
define('DEFAULT_PAGE_SIZE', (!empty($participantsperpage) ? $participantsperpage : 20));
define('SHOW_ALL_PAGE_SIZE', 5000);

$id         = required_param('id', PARAM_INT); // course id.
$roleid     = optional_param('roleid', 0, PARAM_INT); // which role to show
$instanceid = optional_param('instanceid', 0, PARAM_INT); // instance we're looking at.
$timefrom   = optional_param('timefrom', 0, PARAM_INT); // how far back to look...
$action     = optional_param('action', '', PARAM_ALPHA);
$page       = optional_param('page', 0, PARAM_INT);                     // which page to show
$perpage    = optional_param('perpage', DEFAULT_PAGE_SIZE, PARAM_INT);  // how many per page
$currentgroup = optional_param('group', null, PARAM_INT); // Get the active group.

$url = new moodle_url('/report/participation/index.php', array('id'=>$id));
if ($roleid !== 0) $url->param('roleid');
if ($instanceid !== 0) $url->param('instanceid');
if ($timefrom !== 0) $url->param('timefrom');
if ($action !== '') $url->param('action');
if ($page !== 0) $url->param('page');
if ($perpage !== DEFAULT_PAGE_SIZE) $url->param('perpage');
$PAGE->set_url($url);
$PAGE->set_pagelayout('admin');

if ($action != 'view' and $action != 'post') {
    $action = ''; // default to all (don't restrict)
}

if (!$course = $DB->get_record('course', array('id'=>$id))) {
    throw new \moodle_exception('invalidcourse');
}

if ($roleid != 0 and !$role = $DB->get_record('role', array('id'=>$roleid))) {
    throw new \moodle_exception('invalidrole');
}

require_login($course);
$context = context_course::instance($course->id);
require_capability('report/participation:view', $context);

$strparticipation = get_string('participationreport');
$strviews         = get_string('views');
$strposts         = get_string('posts');
$strreports       = get_string('reports');

$actionoptions = report_participation_get_action_options();
if (!array_key_exists($action, $actionoptions)) {
    $action = '';
}

$PAGE->set_title(format_string($course->shortname, true, array('context' => $context)) .': '. $strparticipation);
$PAGE->set_heading(format_string($course->fullname, true, array('context' => $context)));
echo $OUTPUT->header();

// Print the selector dropdown.
$pluginname = get_string('pluginname', 'report_participation');
report_helper::print_report_selector($pluginname);
// Release session lock.
\core\session\manager::write_close();

// Logs will not have been recorded before the course timecreated time.
$minlog = $course->timecreated;
$onlyuselegacyreader = false; // Use only legacy log table to aggregate records.

$logtable = report_participation_get_log_table_name(); // Log table to use for fetaching records.

// If no log table, then use legacy records.
if (empty($logtable)) {
    $onlyuselegacyreader = true;
}

$modinfo = get_fast_modinfo($course);

// Print first controls.
report_participation_print_filter_form($course, $timefrom, $minlog, $action, $roleid, $instanceid);

$baseurl = new moodle_url('/report/participation/index.php', array(
    'id' => $course->id,
    'roleid' => $roleid,
    'instanceid' => $instanceid,
    'timefrom' => $timefrom,
    'action' => $action,
    'perpage' => $perpage,
    'group' => $currentgroup
));
$select = groups_allgroups_course_menu($course, $baseurl, true, $currentgroup);

// User cannot see any group.
if (empty($select)) {
    echo $OUTPUT->heading(get_string("notingroup"));
    echo $OUTPUT->footer();
    exit;
} else {
    echo $select;
}

// Fetch current active group.
$groupmode = groups_get_course_groupmode($course);
$currentgroup = $SESSION->activegroup[$course->id][$groupmode][$course->defaultgroupingid];

if (!empty($instanceid) && !empty($roleid)) {
    $uselegacyreader = $DB->record_exists('log', ['course' => $course->id]);

    // Trigger a report viewed event.
    $event = \report_participation\event\report_viewed::create(array('context' => $context,
            'other' => array('instanceid' => $instanceid, 'groupid' => $currentgroup, 'roleid' => $roleid,
            'timefrom' => $timefrom, 'action' => $action)));
    $event->trigger();

    // from here assume we have at least the module we're using.
    $cm = $modinfo->cms[$instanceid];

    // Group security checks.
    if (!groups_group_visible($currentgroup, $course, $cm)) {
        echo $OUTPUT->heading(get_string("notingroup"));
        echo $OUTPUT->footer();
        exit;
    }

    $table = new flexible_table('course-participation-'.$course->id.'-'.$cm->id.'-'.$roleid);
    $table->course = $course;

    $actionheader = !empty($action) ? get_string($action) : get_string('allactions');

    if (empty($CFG->messaging)) {
        $table->define_columns(array('fullname', 'count'));
        $table->define_headers(array(get_string('user'), $actionheader));
    } else {
        $table->define_columns(array('fullname', 'count', 'select'));
        $mastercheckbox = new \core\output\checkbox_toggleall('participants-table', true, [
            'id' => 'select-all-participants',
            'name' => 'select-all-participants',
            'label' => get_string('select'),
            // Consistent labels to prevent select column from resizing.
            'selectall' => get_string('select'),
            'deselectall' => get_string('select'),
        ]);
        $table->define_headers(array(get_string('user'), $actionheader, $OUTPUT->render($mastercheckbox)));
    }
    $table->define_baseurl($baseurl);

    $table->set_attribute('class', 'generaltable generalbox reporttable');

    $table->sortable(true,'lastname','ASC');
    $table->no_sorting('select');

    $table->set_control_variables(array(
                                        TABLE_VAR_SORT    => 'ssort',
                                        TABLE_VAR_HIDE    => 'shide',
                                        TABLE_VAR_SHOW    => 'sshow',
                                        TABLE_VAR_IFIRST  => 'sifirst',
                                        TABLE_VAR_ILAST   => 'silast',
                                        TABLE_VAR_PAGE    => 'spage'
                                        ));
    $table->setup();

    // We want to query both the current context and parent contexts.
    list($relatedctxsql, $params) = $DB->get_in_or_equal($context->get_parent_context_ids(true), SQL_PARAMS_NAMED, 'relatedctx');
    $params['roleid'] = $roleid;
    $params['instanceid'] = $instanceid;
    $params['timefrom'] = $timefrom;

    $groupsql = "";
    if (!empty($currentgroup)) {
        $groupsql = "JOIN {groups_members} gm ON (gm.userid = u.id AND gm.groupid = :groupid)";
        $params['groupid'] = $currentgroup;
    }

    $countsql = "SELECT COUNT(DISTINCT(ra.userid))
                   FROM {role_assignments} ra
                   JOIN {user} u ON u.id = ra.userid
                   $groupsql
                  WHERE ra.contextid $relatedctxsql AND ra.roleid = :roleid";

    $totalcount = $DB->count_records_sql($countsql, $params);

    list($twhere, $tparams) = $table->get_sql_where();
    if ($twhere) {
        $params = array_merge($params, $tparams);
        $matchcount = $DB->count_records_sql($countsql.' AND '.$twhere, $params);
    } else {
        $matchcount = $totalcount;
    }

    $modulename = get_string('modulename', $cm->modname);
    echo '<div id="participationreport">' . "\n";
    echo '<p class="modulename">' . $modulename . ' ' . $strviews . '<br />'."\n"
        . $modulename . ' ' . $strposts . '</p>'."\n";

    $table->initialbars($totalcount > $perpage);
    $table->pagesize($perpage, $matchcount);

    if ($uselegacyreader || $onlyuselegacyreader) {
        list($actionsql, $actionparams) = report_participation_get_action_sql($action, $cm->modname);
        $params = array_merge($params, $actionparams);
    }

    if (!$onlyuselegacyreader) {
        list($crudsql, $crudparams) = report_participation_get_crud_sql($action);
        $params = array_merge($params, $crudparams);
    }

    $userfieldsapi = \core_user\fields::for_name();
    $usernamefields = $userfieldsapi->get_sql('u', false, '', '', false)->selects;
    $users = array();
    // If using legacy log then get users from old table.
    if ($uselegacyreader || $onlyuselegacyreader) {
        $sql = "SELECT ra.userid, $usernamefields, u.idnumber, l.actioncount AS count
                  FROM (SELECT DISTINCT userid FROM {role_assignments} WHERE contextid $relatedctxsql AND roleid = :roleid ) ra
                  JOIN {user} u ON u.id = ra.userid
             $groupsql
             LEFT JOIN (
                    SELECT userid, COUNT(action) AS actioncount
                      FROM {log}
                     WHERE cmid = :instanceid
                           AND time > :timefrom " . $actionsql .
                " GROUP BY userid) l ON (l.userid = ra.userid)";
        if ($twhere) {
            $sql .= ' WHERE '.$twhere; // Initial bar.
        }

        if ($table->get_sql_sort()) {
            $sql .= ' ORDER BY '.$table->get_sql_sort();
        }
        if (!$users = $DB->get_records_sql($sql, $params, $table->get_page_start(), $table->get_page_size())) {
            $users = array(); // Tablelib will handle saying 'Nothing to display' for us.
        }
    }

    // Get record from sql_internal_table_reader and merge with records got from legacy log (if needed).
    if (!$onlyuselegacyreader) {
        $sql = "SELECT ra.userid, $usernamefields, u.idnumber, COUNT(DISTINCT l.timecreated) AS count
                  FROM {user} u
                  JOIN {role_assignments} ra ON u.id = ra.userid AND ra.contextid $relatedctxsql AND ra.roleid = :roleid
             $groupsql
                  LEFT JOIN {" . $logtable . "} l
                     ON l.contextinstanceid = :instanceid
                       AND l.timecreated > :timefrom" . $crudsql ."
                       AND l.edulevel = :edulevel
                       AND l.anonymous = 0
                       AND l.contextlevel = :contextlevel
                       AND (l.origin = 'web' OR l.origin = 'ws')
                       AND l.userid = ra.userid";
        // We add this after the WHERE statement that may come below.
        $groupbysql = " GROUP BY ra.userid, $usernamefields, u.idnumber";

        $params['edulevel'] = core\event\base::LEVEL_PARTICIPATING;
        $params['contextlevel'] = CONTEXT_MODULE;

        if ($twhere) {
            $sql .= ' WHERE '.$twhere; // Initial bar.
        }
        $sql .= $groupbysql;
        if ($table->get_sql_sort()) {
            $sql .= ' ORDER BY '.$table->get_sql_sort();
        }
        if ($u = $DB->get_records_sql($sql, $params, $table->get_page_start(), $table->get_page_size())) {
            if (empty($users)) {
                $users = $u;
            } else {
                // Merge two users array.
                foreach ($u as $key => $value) {
                    if (isset($users[$key]) && !empty($users[$key]->count)) {
                        if ($value->count) {
                            $users[$key]->count += $value->count;
                        }
                    } else {
                        $users[$key] = $value;
                    }
                }
            }
            unset($u);
            $u = null;
        }
    }

    $data = array();

    $a = new stdClass();
    $a->count = $totalcount;
    $a->items = format_string($role->name, true, array('context' => $context));

    if ($matchcount != $totalcount) {
        $a->count = $matchcount.'/'.$a->count;
    }

    echo '<h2>'.get_string('counteditems', '', $a).'</h2>'."\n";

    if (!empty($CFG->messaging)) {
        echo '<form action="'.$CFG->wwwroot.'/user/action_redir.php" method="post" id="participantsform">'."\n";
        echo '<div>'."\n";
        echo '<input type="hidden" name="id" value="'.$id.'" />'."\n";
        echo '<input type="hidden" name="returnto" value="'. s($PAGE->url) .'" />'."\n";
        echo '<input type="hidden" name="sesskey" value="'.sesskey().'" />'."\n";
    }

    foreach ($users as $u) {
        $data = array();
        $data[] = html_writer::link(new moodle_url('/user/view.php', array('id' => $u->userid, 'course' => $course->id)),
            fullname($u, true));
        $data[] = !empty($u->count) ? get_string('yes').' ('.$u->count.') ' : get_string('no');

        if (!empty($CFG->messaging)) {
            $togglegroup = 'participants-table';
            if (empty($u->count)) {
                $togglegroup .= ' no';
            }
            $checkbox = new \core\output\checkbox_toggleall($togglegroup, false, [
                'classes' => 'usercheckbox',
                'name' => 'user' . $u->userid,
                'value' => $u->count,
            ]);
            $data[] = $OUTPUT->render($checkbox);
        }
        $table->add_data($data);
    }

    $table->print_html();

    if ($perpage == SHOW_ALL_PAGE_SIZE) {
        $perpageurl = new moodle_url($baseurl, array('perpage' => DEFAULT_PAGE_SIZE));
        echo html_writer::start_div('', array('id' => 'showall'));
        echo html_writer::link($perpageurl, get_string('showperpage', '', DEFAULT_PAGE_SIZE));
        echo html_writer::end_div();
    } else if ($matchcount > 0 && $perpage < $matchcount) {
        $perpageurl = new moodle_url($baseurl, array('perpage' => SHOW_ALL_PAGE_SIZE));
        echo html_writer::start_div('', array('id' => 'showall'));
        echo html_writer::link($perpageurl, get_string('showall', '', $matchcount));
        echo html_writer::end_div();
    }

    if (!empty($CFG->messaging)) {
        echo '<div class="selectbuttons btn-group">';
        if ($perpage >= $matchcount) {
            $checknos = new \core\output\checkbox_toggleall('participants-table no', true, [
                'id' => 'select-nos',
                'name' => 'select-nos',
                'label' => get_string('selectnos'),
                'selectall' => get_string('selectnos'),
                'deselectall' => get_string('deselectnos'),
            ], true);
            echo $OUTPUT->render($checknos);
        }
        echo '</div>';
        echo '<div class="py-3">';
        echo html_writer::label(get_string('withselectedusers'), 'formactionid');
        $displaylist['#messageselect'] = get_string('messageselectadd');
        $withselectedparams = array(
            'id' => 'formactionid',
            'data-action' => 'toggle',
            'data-togglegroup' => 'participants-table',
            'data-toggle' => 'action',
            'disabled' => true
        );
        echo html_writer::select($displaylist, 'formaction', '', array('' => 'choosedots'), $withselectedparams);
        echo '</div>';
        echo '</div>'."\n";
        echo '</form>'."\n";

        $options = new stdClass();
        $options->courseid = $course->id;
        $options->noteStateNames = note_get_state_names();
        $options->stateHelpIcon = $OUTPUT->help_icon('publishstate', 'notes');
        $PAGE->requires->js_call_amd('report_participation/participants', 'init', [$options]);
    }
    echo '</div>'."\n";
}

echo $OUTPUT->footer();