group/autogroup.php

   1 <?php
   2 // This file is part of Moodle - http://moodle.org/
   3 //
   4 // Moodle is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU General Public License as published by
   6 // the Free Software Foundation, either version 3 of the License, or
   7 // (at your option) any later version.
   8 //
   9 // Moodle is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16
  17
  18 /**
  19  * Create and allocate users to groups
  20  *
  21  * @package    core_group
  22  * @copyright  Matt Clarkson mattc@catalyst.net.nz
  23  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24  */
  25
  26 require_once('../config.php');
  27 require_once('lib.php');
  28 require_once('autogroup_form.php');
  29
  30 if (!defined('AUTOGROUP_MIN_RATIO')) {
  31     define('AUTOGROUP_MIN_RATIO', 0.7); // means minimum member count is 70% in the smallest group
  32 }
  33
  34 $courseid = required_param('courseid', PARAM_INT);
  35 $PAGE->set_url('/group/autogroup.php', array('courseid' => $courseid));
  36
  37 if (!$course = $DB->get_record('course', array('id'=>$courseid))) {
  38     print_error('invalidcourseid');
  39 }
  40
  41 // Make sure that the user has permissions to manage groups.
  42 require_login($course);
  43
  44 $context       = context_course::instance($courseid);
  45 require_capability('moodle/course:managegroups', $context);
  46
  47 $returnurl = $CFG->wwwroot.'/group/index.php?id='.$course->id;
  48
  49 $strgroups           = get_string('groups');
  50 $strparticipants     = get_string('participants');
  51 $strautocreategroups = get_string('autocreategroups', 'group');
  52
  53 $PAGE->set_title($strgroups);
  54 $PAGE->set_heading($course->fullname. ': '.$strgroups);
  55 $PAGE->set_pagelayout('admin');
  56 navigation_node::override_active_url(new moodle_url('/group/index.php', array('id' => $courseid)));
  57
  58 // Print the page and form
  59 $preview = '';
  60 $error = '';
  61
  62 /// Get applicable roles - used in menus etc later on
  63 $rolenames = role_fix_names(get_profile_roles($context), $context, ROLENAME_ALIAS, true);
  64
  65 /// Create the form
  66 $editform = new autogroup_form(null, array('roles' => $rolenames));
  67 $editform->set_data(array('courseid' => $courseid, 'seed' => time()));
  68
  69 /// Handle form submission
  70 if ($editform->is_cancelled()) {
  71     redirect($returnurl);
  72
  73 } elseif ($data = $editform->get_data()) {
  74
  75     /// Allocate members from the selected role to groups
  76     switch ($data->allocateby) {
  77         case 'no':
  78         case 'random':
  79         case 'lastname':
  80             $orderby = 'lastname, firstname'; break;
  81         case 'firstname':
  82             $orderby = 'firstname, lastname'; break;
  83         case 'idnumber':
  84             $orderby = 'idnumber'; break;
  85         default:
  86             print_error('unknoworder');
  87     }
  88     $source = array();
  89     if ($data->cohortid) {
  90         $source['cohortid'] = $data->cohortid;
  91     }
  92     if ($data->groupingid) {
  93         $source['groupingid'] = $data->groupingid;
  94     }
  95     if ($data->groupid) {
  96         $source['groupid'] = $data->groupid;
  97     }
  98     $users = groups_get_potential_members($data->courseid, $data->roleid, $source, $orderby, !empty($data->notingroup));
  99     $usercnt = count($users);
 100
 101     if ($data->allocateby == 'random') {
 102         srand($data->seed);
 103         shuffle($users);
 104     }
 105
 106     $groups = array();
 107
 108     // Plan the allocation
 109     if ($data->groupby == 'groups') {
 110         $numgrps    = $data->number;
 111         $userpergrp = floor($usercnt/$numgrps);
 112
 113     } else { // members
 114         $numgrps    = ceil($usercnt/$data->number);
 115         $userpergrp = $data->number;
 116
 117         if (!empty($data->nosmallgroups) and $usercnt % $data->number != 0) {
 118             // If there would be one group with a small number of member reduce the number of groups
 119             $missing = $userpergrp * $numgrps - $usercnt;
 120             if ($missing > $userpergrp * (1-AUTOGROUP_MIN_RATIO)) {
 121                 // spread the users from the last small group
 122                 $numgrps--;
 123                 $userpergrp = floor($usercnt/$numgrps);
 124             }
 125         }
 126     }
 127
 128     // allocate the users - all groups equal count first
 129     for ($i=0; $i<$numgrps; $i++) {
 130         $groups[$i] = array();
 131         $groups[$i]['name']    = groups_parse_name(trim($data->namingscheme), $i);
 132         $groups[$i]['members'] = array();
 133         if ($data->allocateby == 'no') {
 134             continue; // do not allocate users
 135         }
 136         for ($j=0; $j<$userpergrp; $j++) {
 137             if (empty($users)) {
 138                 break 2;
 139             }
 140             $user = array_shift($users);
 141             $groups[$i]['members'][$user->id] = $user;
 142         }
 143     }
 144     // now distribute the rest
 145     if ($data->allocateby != 'no') {
 146         for ($i=0; $i<$numgrps; $i++) {
 147             if (empty($users)) {
 148                 break 1;
 149             }
 150             $user = array_shift($users);
 151             $groups[$i]['members'][$user->id] = $user;
 152         }
 153     }
 154
 155     if (isset($data->preview)) {
 156         $table = new html_table();
 157         if ($data->allocateby == 'no') {
 158             $table->head  = array(get_string('groupscount', 'group', $numgrps));
 159             $table->size  = array('100%');
 160             $table->align = array('left');
 161             $table->width = '40%';
 162         } else {
 163             $table->head  = array(get_string('groupscount', 'group', $numgrps), get_string('groupmembers', 'group'), get_string('usercounttotal', 'group', $usercnt));
 164             $table->size  = array('20%', '70%', '10%');
 165             $table->align = array('left', 'left', 'center');
 166             $table->width = '90%';
 167         }
 168         $table->data  = array();
 169
 170         foreach ($groups as $group) {
 171             $line = array();
 172             if (groups_get_group_by_name($courseid, $group['name'])) {
 173                 $line[] = '<span class="notifyproblem">'.get_string('groupnameexists', 'group', $group['name']).'</span>';
 174                 $error = get_string('groupnameexists', 'group', $group['name']);
 175             } else {
 176                 $line[] = $group['name'];
 177             }
 178             if ($data->allocateby != 'no') {
 179                 $unames = array();
 180                 foreach ($group['members'] as $user) {
 181                     $unames[] = fullname($user, true);
 182                 }
 183                 $line[] = implode(', ', $unames);
 184                 $line[] = count($group['members']);
 185             }
 186             $table->data[] = $line;
 187         }
 188
 189         $preview .= html_writer::table($table);
 190
 191     } else {
 192         $grouping = null;
 193         $createdgrouping = null;
 194         $createdgroups = array();
 195         $failed = false;
 196
 197         // prepare grouping
 198         if (!empty($data->grouping)) {
 199             if ($data->grouping < 0) {
 200                 $grouping = new stdClass();
 201                 $grouping->courseid = $COURSE->id;
 202                 $grouping->name     = trim($data->groupingname);
 203                 $grouping->id = groups_create_grouping($grouping);
 204                 $createdgrouping = $grouping->id;
 205             } else {
 206                 $grouping = groups_get_grouping($data->grouping);
 207             }
 208         }
 209
 210         // Save the groups data
 211         foreach ($groups as $key=>$group) {
 212             if (groups_get_group_by_name($courseid, $group['name'])) {
 213                 $error = get_string('groupnameexists', 'group', $group['name']);
 214                 $failed = true;
 215                 break;
 216             }
 217             $newgroup = new stdClass();
 218             $newgroup->courseid = $data->courseid;
 219             $newgroup->name     = $group['name'];
 220             $groupid = groups_create_group($newgroup);
 221             $createdgroups[] = $groupid;
 222             foreach($group['members'] as $user) {
 223                 groups_add_member($groupid, $user->id);
 224             }
 225             if ($grouping) {
 226                 // Ask this function not to invalidate the cache, we'll do that manually once at the end.
 227                 groups_assign_grouping($grouping->id, $groupid, null, false);
 228             }
 229         }
 230
 231         // Invalidate the course groups cache seeing as we've changed it.
 232         cache_helper::invalidate_by_definition('core', 'groupdata', array(), array($courseid));
 233
 234         if ($failed) {
 235             foreach ($createdgroups as $groupid) {
 236                 groups_delete_group($groupid);
 237             }
 238             if ($createdgrouping) {
 239                 groups_delete_grouping($createdgrouping);
 240             }
 241         } else {
 242             redirect($returnurl);
 243         }
 244     }
 245 }
 246
 247 $PAGE->navbar->add($strparticipants, new moodle_url('/user/index.php', array('id'=>$courseid)));
 248 $PAGE->navbar->add($strgroups, new moodle_url('/group/index.php', array('id'=>$courseid)));
 249 $PAGE->navbar->add($strautocreategroups);
 250
 251 echo $OUTPUT->header();
 252 echo $OUTPUT->heading($strautocreategroups);
 253
 254 if ($error != '') {
 255     echo $OUTPUT->notification($error);
 256 }
 257
 258 /// Display the form
 259 $editform->display();
 260
 261 if($preview !== '') {
 262     echo $OUTPUT->heading(get_string('groupspreview', 'group'));
 263
 264     echo $preview;
 265 }
 266
 267 echo $OUTPUT->footer();