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   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 [email protected]
  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();