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     $users = groups_get_potential_members($data->courseid, $data->roleid, $data->cohortid, $orderby);
  89     $usercnt = count($users);
  90
  91     if ($data->allocateby == 'random') {
  92         srand($data->seed);
  93         shuffle($users);
  94     }
  95
  96     $groups = array();
  97
  98     // Plan the allocation
  99     if ($data->groupby == 'groups') {
 100         $numgrps    = $data->number;
 101         $userpergrp = floor($usercnt/$numgrps);
 102
 103     } else { // members
 104         $numgrps    = ceil($usercnt/$data->number);
 105         $userpergrp = $data->number;
 106
 107         if (!empty($data->nosmallgroups) and $usercnt % $data->number != 0) {
 108             // If there would be one group with a small number of member reduce the number of groups
 109             $missing = $userpergrp * $numgrps - $usercnt;
 110             if ($missing > $userpergrp * (1-AUTOGROUP_MIN_RATIO)) {
 111                 // spread the users from the last small group
 112                 $numgrps--;
 113                 $userpergrp = floor($usercnt/$numgrps);
 114             }
 115         }
 116     }
 117
 118     // allocate the users - all groups equal count first
 119     for ($i=0; $i<$numgrps; $i++) {
 120         $groups[$i] = array();
 121         $groups[$i]['name']    = groups_parse_name(trim($data->namingscheme), $i);
 122         $groups[$i]['members'] = array();
 123         if ($data->allocateby == 'no') {
 124             continue; // do not allocate users
 125         }
 126         for ($j=0; $j<$userpergrp; $j++) {
 127             if (empty($users)) {
 128                 break 2;
 129             }
 130             $user = array_shift($users);
 131             $groups[$i]['members'][$user->id] = $user;
 132         }
 133     }
 134     // now distribute the rest
 135     if ($data->allocateby != 'no') {
 136         for ($i=0; $i<$numgrps; $i++) {
 137             if (empty($users)) {
 138                 break 1;
 139             }
 140             $user = array_shift($users);
 141             $groups[$i]['members'][$user->id] = $user;
 142         }
 143     }
 144
 145     if (isset($data->preview)) {
 146         $table = new html_table();
 147         if ($data->allocateby == 'no') {
 148             $table->head  = array(get_string('groupscount', 'group', $numgrps));
 149             $table->size  = array('100%');
 150             $table->align = array('left');
 151             $table->width = '40%';
 152         } else {
 153             $table->head  = array(get_string('groupscount', 'group', $numgrps), get_string('groupmembers', 'group'), get_string('usercounttotal', 'group', $usercnt));
 154             $table->size  = array('20%', '70%', '10%');
 155             $table->align = array('left', 'left', 'center');
 156             $table->width = '90%';
 157         }
 158         $table->data  = array();
 159
 160         foreach ($groups as $group) {
 161             $line = array();
 162             if (groups_get_group_by_name($courseid, $group['name'])) {
 163                 $line[] = '<span class="notifyproblem">'.get_string('groupnameexists', 'group', $group['name']).'</span>';
 164                 $error = get_string('groupnameexists', 'group', $group['name']);
 165             } else {
 166                 $line[] = $group['name'];
 167             }
 168             if ($data->allocateby != 'no') {
 169                 $unames = array();
 170                 foreach ($group['members'] as $user) {
 171                     $unames[] = fullname($user, true);
 172                 }
 173                 $line[] = implode(', ', $unames);
 174                 $line[] = count($group['members']);
 175             }
 176             $table->data[] = $line;
 177         }
 178
 179         $preview .= html_writer::table($table);
 180
 181     } else {
 182         $grouping = null;
 183         $createdgrouping = null;
 184         $createdgroups = array();
 185         $failed = false;
 186
 187         // prepare grouping
 188         if (!empty($data->grouping)) {
 189             if ($data->grouping < 0) {
 190                 $grouping = new stdClass();
 191                 $grouping->courseid = $COURSE->id;
 192                 $grouping->name     = trim($data->groupingname);
 193                 $grouping->id = groups_create_grouping($grouping);
 194                 $createdgrouping = $grouping->id;
 195             } else {
 196                 $grouping = groups_get_grouping($data->grouping);
 197             }
 198         }
 199
 200         // Save the groups data
 201         foreach ($groups as $key=>$group) {
 202             if (groups_get_group_by_name($courseid, $group['name'])) {
 203                 $error = get_string('groupnameexists', 'group', $group['name']);
 204                 $failed = true;
 205                 break;
 206             }
 207             $newgroup = new stdClass();
 208             $newgroup->courseid = $data->courseid;
 209             $newgroup->name     = $group['name'];
 210             $groupid = groups_create_group($newgroup);
 211             $createdgroups[] = $groupid;
 212             foreach($group['members'] as $user) {
 213                 groups_add_member($groupid, $user->id);
 214             }
 215             if ($grouping) {
 216                 // Ask this function not to invalidate the cache, we'll do that manually once at the end.
 217                 groups_assign_grouping($grouping->id, $groupid, null, false);
 218             }
 219         }
 220
 221         // Invalidate the course groups cache seeing as we've changed it.
 222         cache_helper::invalidate_by_definition('core', 'groupdata', array(), array($courseid));
 223
 224         if ($failed) {
 225             foreach ($createdgroups as $groupid) {
 226                 groups_delete_group($groupid);
 227             }
 228             if ($createdgrouping) {
 229                 groups_delete_grouping($createdgrouping);
 230             }
 231         } else {
 232             redirect($returnurl);
 233         }
 234     }
 235 }
 236
 237 $PAGE->navbar->add($strparticipants, new moodle_url('/user/index.php', array('id'=>$courseid)));
 238 $PAGE->navbar->add($strgroups, new moodle_url('/group/index.php', array('id'=>$courseid)));
 239 $PAGE->navbar->add($strautocreategroups);
 240
 241 echo $OUTPUT->header();
 242 echo $OUTPUT->heading($strautocreategroups);
 243
 244 if ($error != '') {
 245     echo $OUTPUT->notification($error);
 246 }
 247
 248 /// Display the form
 249 $editform->display();
 250
 251 if($preview !== '') {
 252     echo $OUTPUT->heading(get_string('groupspreview', 'group'));
 253
 254     echo $preview;
 255 }
 256
 257 echo $OUTPUT->footer();