mod/assign/locallib.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  * This file contains the definition for the class assignment
  19  *
  20  * This class provides all the functionality for the new assign module.
  21  *
  22  * @package   mod_assign
  23  * @copyright 2012 NetSpot {@link http://www.netspot.com.au}
  24  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  25  */
  26
  27 defined('MOODLE_INTERNAL') || die();
  28
  29 /**
  30  * Assignment submission statuses
  31  */
  32 define('ASSIGN_SUBMISSION_STATUS_DRAFT', 'draft'); // student thinks it is a draft
  33 define('ASSIGN_SUBMISSION_STATUS_SUBMITTED', 'submitted'); // student thinks it is finished
  34
  35 /**
  36  * Search filters for grading page
  37  */
  38 define('ASSIGN_FILTER_SUBMITTED', 'submitted');
  39 define('ASSIGN_FILTER_SINGLE_USER', 'singleuser');
  40 define('ASSIGN_FILTER_REQUIRE_GRADING', 'require_grading');
  41
  42 /** Include accesslib.php */
  43 require_once($CFG->libdir.'/accesslib.php');
  44 /** Include formslib.php */
  45 require_once($CFG->libdir.'/formslib.php');
  46 /** Include repository/lib.php */
  47 require_once($CFG->dirroot . '/repository/lib.php');
  48 /** Include local mod_form.php */
  49 require_once($CFG->dirroot.'/mod/assign/mod_form.php');
  50 /** gradelib.php */
  51 require_once($CFG->libdir.'/gradelib.php');
  52 /** grading lib.php */
  53 require_once($CFG->dirroot.'/grade/grading/lib.php');
  54 /** Include feedbackplugin.php */
  55 require_once($CFG->dirroot.'/mod/assign/feedbackplugin.php');
  56 /** Include submissionplugin.php */
  57 require_once($CFG->dirroot.'/mod/assign/submissionplugin.php');
  58 /** Include renderable.php */
  59 require_once($CFG->dirroot.'/mod/assign/renderable.php');
  60 /** Include gradingtable.php */
  61 require_once($CFG->dirroot.'/mod/assign/gradingtable.php');
  62 /** Include eventslib.php */
  63 require_once($CFG->libdir.'/eventslib.php');
  64 /** Include portfolio caller.php */
  65 require_once($CFG->libdir . '/portfolio/caller.php');
  66
  67 /**
  68  * Standard base class for mod_assign (assignment types).
  69  *
  70  * @package   mod_assign
  71  * @copyright 2012 NetSpot {@link http://www.netspot.com.au}
  72  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  73  */
  74 class assign {
  75
  76
  77     /** @var stdClass the assignment record that contains the global settings for this assign instance */
  78     private $instance;
  79
  80     /** @var context the context of the course module for this assign instance (or just the course if we are
  81         creating a new one) */
  82     private $context;
  83
  84     /** @var stdClass the course this assign instance belongs to */
  85     private $course;
  86
  87     /** @var stdClass the admin config for all assign instances  */
  88     private $adminconfig;
  89
  90
  91     /** @var assign_renderer the custom renderer for this module */
  92     private $output;
  93
  94     /** @var stdClass the course module for this assign instance */
  95     private $coursemodule;
  96
  97     /** @var array cache for things like the coursemodule name or the scale menu - only lives for a single
  98         request */
  99     private $cache;
 100
 101     /** @var array list of the installed submission plugins */
 102     private $submissionplugins;
 103
 104     /** @var array list of the installed feedback plugins */
 105     private $feedbackplugins;
 106
 107     /** @var string action to be used to return to this page (without repeating any form submissions etc.) */
 108     private $returnaction = 'view';
 109
 110     /** @var array params to be used to return to this page */
 111     private $returnparams = array();
 112
 113     /** @var string modulename prevents excessive calls to get_string */
 114     private static $modulename = null;
 115
 116     /** @var string modulenameplural prevents excessive calls to get_string */
 117     private static $modulenameplural = null;
 118
 119     /**
 120      * Constructor for the base assign class
 121      *
 122      * @param mixed $coursemodulecontext context|null the course module context (or the course context if the coursemodule has not been created yet)
 123      * @param mixed $coursemodule the current course module if it was already loaded - otherwise this class will load one from the context as required
 124      * @param mixed $course the current course  if it was already loaded - otherwise this class will load one from the context as required
 125      */
 126     public function __construct($coursemodulecontext, $coursemodule, $course) {
 127         global $PAGE;
 128
 129         $this->context = $coursemodulecontext;
 130         $this->coursemodule = $coursemodule;
 131         $this->course = $course;
 132         $this->cache = array(); // temporary cache only lives for a single request - used to reduce db lookups
 133
 134         $this->submissionplugins = $this->load_plugins('assignsubmission');
 135         $this->feedbackplugins = $this->load_plugins('assignfeedback');
 136     }
 137
 138     /**
 139      * Set the action and parameters that can be used to return to the current page
 140      *
 141      * @param string $action The action for the current page
 142      * @param array $params An array of name value pairs which form the parameters to return to the current page
 143      * @return void
 144      */
 145     public function register_return_link($action, $params) {
 146         $this->returnaction = $action;
 147         $this->returnparams = $params;
 148     }
 149
 150     /**
 151      * Return an action that can be used to get back to the current page
 152      * @return string action
 153      */
 154     public function get_return_action() {
 155         return $this->returnaction;
 156     }
 157
 158     /**
 159      * Based on the current assignment settings should we display the intro
 160      * @return bool showintro
 161      */
 162     private function show_intro() {
 163         if ($this->get_instance()->alwaysshowdescription ||
 164                 time() > $this->get_instance()->allowsubmissionsfromdate) {
 165             return true;
 166         }
 167         return false;
 168     }
 169
 170     /**
 171      * Return a list of parameters that can be used to get back to the current page
 172      * @return array params
 173      */
 174     public function get_return_params() {
 175         return $this->returnparams;
 176     }
 177
 178     /**
 179      * Set the submitted form data
 180      * @param stdClass $data The form data (instance)
 181      */
 182     public function set_instance(stdClass $data) {
 183         $this->instance = $data;
 184     }
 185
 186     /**
 187      * Set the context
 188      * @param context $context The new context
 189      */
 190     public function set_context(context $context) {
 191         $this->context = $context;
 192     }
 193
 194     /**
 195      * Set the course data
 196      * @param stdClass $course The course data
 197      */
 198     public function set_course(stdClass $course) {
 199         $this->course = $course;
 200     }
 201
 202     /**
 203      * get list of feedback plugins installed
 204      * @return array
 205      */
 206     public function get_feedback_plugins() {
 207         return $this->feedbackplugins;
 208     }
 209
 210     /**
 211      * get list of submission plugins installed
 212      * @return array
 213      */
 214     public function get_submission_plugins() {
 215         return $this->submissionplugins;
 216     }
 217
 218     /**
 219      * Is blind marking enabled and reveal identities not set yet?
 220      *
 221      * @return bool
 222      */
 223     public function is_blind_marking() {
 224         return $this->get_instance()->blindmarking && !$this->get_instance()->revealidentities;
 225     }
 226
 227     /**
 228      * Does an assignment have submission(s) or grade(s) already?
 229      *
 230      * @return bool
 231      */
 232     public function has_submissions_or_grades() {
 233         $allgrades = $this->count_grades();
 234         $allsubmissions = $this->count_submissions();
 235         if (($allgrades == 0) && ($allsubmissions == 0)) {
 236             return false;
 237         }
 238         return true;
 239     }
 240
 241     /**
 242      * get a specific submission plugin by its type
 243      * @param string $subtype assignsubmission | assignfeedback
 244      * @param string $type
 245      * @return mixed assign_plugin|null
 246      */
 247     public function get_plugin_by_type($subtype, $type) {
 248         $shortsubtype = substr($subtype, strlen('assign'));
 249         $name = $shortsubtype . 'plugins';
 250         if ($name != 'feedbackplugins' && $name != 'submissionplugins') {
 251             return null;
 252         }
 253         $pluginlist = $this->$name;
 254         foreach ($pluginlist as $plugin) {
 255             if ($plugin->get_type() == $type) {
 256                 return $plugin;
 257             }
 258         }
 259         return null;
 260     }
 261
 262     /**
 263      * Get a feedback plugin by type
 264      * @param string $type - The type of plugin e.g comments
 265      * @return mixed assign_feedback_plugin|null
 266      */
 267     public function get_feedback_plugin_by_type($type) {
 268         return $this->get_plugin_by_type('assignfeedback', $type);
 269     }
 270
 271     /**
 272      * Get a submission plugin by type
 273      * @param string $type - The type of plugin e.g comments
 274      * @return mixed assign_submission_plugin|null
 275      */
 276     public function get_submission_plugin_by_type($type) {
 277         return $this->get_plugin_by_type('assignsubmission', $type);
 278     }
 279
 280     /**
 281      * Load the plugins from the sub folders under subtype
 282      * @param string $subtype - either submission or feedback
 283      * @return array - The sorted list of plugins
 284      */
 285     private function load_plugins($subtype) {
 286         global $CFG;
 287         $result = array();
 288
 289         $names = get_plugin_list($subtype);
 290
 291         foreach ($names as $name => $path) {
 292             if (file_exists($path . '/locallib.php')) {
 293                 require_once($path . '/locallib.php');
 294
 295                 $shortsubtype = substr($subtype, strlen('assign'));
 296                 $pluginclass = 'assign_' . $shortsubtype . '_' . $name;
 297
 298                 $plugin = new $pluginclass($this, $name);
 299
 300                 if ($plugin instanceof assign_plugin) {
 301                     $idx = $plugin->get_sort_order();
 302                     while (array_key_exists($idx, $result)) $idx +=1;
 303                     $result[$idx] = $plugin;
 304                 }
 305             }
 306         }
 307         ksort($result);
 308         return $result;
 309     }
 310
 311     /**
 312      * Display the assignment, used by view.php
 313      *
 314      * The assignment is displayed differently depending on your role,
 315      * the settings for the assignment and the status of the assignment.
 316      * @param string $action The current action if any.
 317      * @return void
 318      */
 319     public function view($action='') {
 320
 321         $o = '';
 322         $mform = null;
 323         $notices = array();
 324
 325         // Handle form submissions first.
 326         if ($action == 'savesubmission') {
 327             $action = 'editsubmission';
 328             if ($this->process_save_submission($mform, $notices)) {
 329                 $action = 'view';
 330             }
 331         } else if ($action == 'lock') {
 332             $this->process_lock();
 333             $action = 'grading';
 334         } else if ($action == 'reverttodraft') {
 335             $this->process_revert_to_draft();
 336             $action = 'grading';
 337         } else if ($action == 'unlock') {
 338             $this->process_unlock();
 339             $action = 'grading';
 340         } else if ($action == 'confirmsubmit') {
 341             $action = 'submit';
 342             if ($this->process_submit_for_grading($mform)) {
 343                 $action = 'view';
 344             }
 345         } else if ($action == 'gradingbatchoperation') {
 346             $action = $this->process_grading_batch_operation($mform);
 347         } else if ($action == 'submitgrade') {
 348             if (optional_param('saveandshownext', null, PARAM_RAW)) {
 349                 //save and show next
 350                 $action = 'grade';
 351                 if ($this->process_save_grade($mform)) {
 352                     $action = 'nextgrade';
 353                 }
 354             } else if (optional_param('nosaveandprevious', null, PARAM_RAW)) {
 355                 $action = 'previousgrade';
 356             } else if (optional_param('nosaveandnext', null, PARAM_RAW)) {
 357                 //show next button
 358                 $action = 'nextgrade';
 359             } else if (optional_param('savegrade', null, PARAM_RAW)) {
 360                 //save changes button
 361                 $action = 'grade';
 362                 if ($this->process_save_grade($mform)) {
 363                     $action = 'grading';
 364                 }
 365             } else {
 366                 //cancel button
 367                 $action = 'grading';
 368             }
 369         } else if ($action == 'quickgrade') {
 370             $message = $this->process_save_quick_grades();
 371             $action = 'quickgradingresult';
 372         } else if ($action == 'saveoptions') {
 373             $this->process_save_grading_options();
 374             $action = 'grading';
 375         } else if ($action == 'saveextension') {
 376             $action = 'grantextension';
 377             if ($this->process_save_extension($mform)) {
 378                 $action = 'grading';
 379             }
 380         } else if ($action == 'revealidentitiesconfirm') {
 381             $this->process_reveal_identities();
 382             $action = 'grading';
 383         }
 384
 385         $returnparams = array('rownum'=>optional_param('rownum', 0, PARAM_INT));
 386         $this->register_return_link($action, $returnparams);
 387
 388         // Now show the right view page.
 389         if ($action == 'previousgrade') {
 390             $mform = null;
 391             $o .= $this->view_single_grade_page($mform, -1);
 392         } else if ($action == 'quickgradingresult') {
 393             $mform = null;
 394             $o .= $this->view_quickgrading_result($message);
 395         } else if ($action == 'nextgrade') {
 396             $mform = null;
 397             $o .= $this->view_single_grade_page($mform, 1);
 398         } else if ($action == 'grade') {
 399             $o .= $this->view_single_grade_page($mform);
 400         } else if ($action == 'viewpluginassignfeedback') {
 401             $o .= $this->view_plugin_content('assignfeedback');
 402         } else if ($action == 'viewpluginassignsubmission') {
 403             $o .= $this->view_plugin_content('assignsubmission');
 404         } else if ($action == 'editsubmission') {
 405             $o .= $this->view_edit_submission_page($mform, $notices);
 406         } else if ($action == 'grading') {
 407             $o .= $this->view_grading_page();
 408         } else if ($action == 'downloadall') {
 409             $o .= $this->download_submissions();
 410         } else if ($action == 'submit') {
 411             $o .= $this->check_submit_for_grading($mform);
 412         } else if ($action == 'grantextension') {
 413             $o .= $this->view_grant_extension($mform);
 414         } else if ($action == 'revealidentities') {
 415             $o .= $this->view_reveal_identities_confirm($mform);
 416         } else if ($action == 'plugingradingbatchoperation') {
 417             $o .= $this->view_plugin_grading_batch_operation($mform);
 418         } else if ($action == 'viewpluginpage') {
 419              $o .= $this->view_plugin_page();
 420         } else if ($action == 'viewcourseindex') {
 421              $o .= $this->view_course_index();
 422         } else {
 423             $o .= $this->view_submission_page();
 424         }
 425
 426         return $o;
 427     }
 428
 429
 430     /**
 431      * Add this instance to the database
 432      *
 433      * @param stdClass $formdata The data submitted from the form
 434      * @param bool $callplugins This is used to skip the plugin code
 435      *             when upgrading an old assignment to a new one (the plugins get called manually)
 436      * @return mixed false if an error occurs or the int id of the new instance
 437      */
 438     public function add_instance(stdClass $formdata, $callplugins) {
 439         global $DB;
 440
 441         $err = '';
 442
 443         // add the database record
 444         $update = new stdClass();
 445         $update->name = $formdata->name;
 446         $update->timemodified = time();
 447         $update->timecreated = time();
 448         $update->course = $formdata->course;
 449         $update->courseid = $formdata->course;
 450         $update->intro = $formdata->intro;
 451         $update->introformat = $formdata->introformat;
 452         $update->alwaysshowdescription = $formdata->alwaysshowdescription;
 453         $update->submissiondrafts = $formdata->submissiondrafts;
 454         $update->requiresubmissionstatement = $formdata->requiresubmissionstatement;
 455         $update->sendnotifications = $formdata->sendnotifications;
 456         $update->sendlatenotifications = $formdata->sendlatenotifications;
 457         $update->duedate = $formdata->duedate;
 458         $update->cutoffdate = $formdata->cutoffdate;
 459         $update->allowsubmissionsfromdate = $formdata->allowsubmissionsfromdate;
 460         $update->grade = $formdata->grade;
 461         $update->completionsubmit = !empty($formdata->completionsubmit);
 462         $update->teamsubmission = $formdata->teamsubmission;
 463         $update->requireallteammemberssubmit = $formdata->requireallteammemberssubmit;
 464         $update->teamsubmissiongroupingid = $formdata->teamsubmissiongroupingid;
 465         $update->blindmarking = $formdata->blindmarking;
 466
 467         $returnid = $DB->insert_record('assign', $update);
 468         $this->instance = $DB->get_record('assign', array('id'=>$returnid), '*', MUST_EXIST);
 469         // cache the course record
 470         $this->course = $DB->get_record('course', array('id'=>$formdata->course), '*', MUST_EXIST);
 471
 472         if ($callplugins) {
 473             // call save_settings hook for submission plugins
 474             foreach ($this->submissionplugins as $plugin) {
 475                 if (!$this->update_plugin_instance($plugin, $formdata)) {
 476                     print_error($plugin->get_error());
 477                     return false;
 478                 }
 479             }
 480             foreach ($this->feedbackplugins as $plugin) {
 481                 if (!$this->update_plugin_instance($plugin, $formdata)) {
 482                     print_error($plugin->get_error());
 483                     return false;
 484                 }
 485             }
 486
 487             // in the case of upgrades the coursemodule has not been set so we need to wait before calling these two
 488             // TODO: add event to the calendar
 489             $this->update_calendar($formdata->coursemodule);
 490             // TODO: add the item in the gradebook
 491             $this->update_gradebook(false, $formdata->coursemodule);
 492
 493         }
 494
 495         $update = new stdClass();
 496         $update->id = $this->get_instance()->id;
 497         $update->nosubmissions = (!$this->is_any_submission_plugin_enabled()) ? 1: 0;
 498         $DB->update_record('assign', $update);
 499
 500         return $returnid;
 501     }
 502
 503     /**
 504      * Delete all grades from the gradebook for this assignment
 505      *
 506      * @return bool
 507      */
 508     private function delete_grades() {
 509         global $CFG;
 510
 511         return grade_update('mod/assign', $this->get_course()->id, 'mod', 'assign', $this->get_instance()->id, 0, NULL, array('deleted'=>1)) == GRADE_UPDATE_OK;
 512     }
 513
 514     /**
 515      * Delete this instance from the database
 516      *
 517      * @return bool false if an error occurs
 518      */
 519     public function delete_instance() {
 520         global $DB;
 521         $result = true;
 522
 523         foreach ($this->submissionplugins as $plugin) {
 524             if (!$plugin->delete_instance()) {
 525                 print_error($plugin->get_error());
 526                 $result = false;
 527             }
 528         }
 529         foreach ($this->feedbackplugins as $plugin) {
 530             if (!$plugin->delete_instance()) {
 531                 print_error($plugin->get_error());
 532                 $result = false;
 533             }
 534         }
 535
 536         // delete files associated with this assignment
 537         $fs = get_file_storage();
 538         if (! $fs->delete_area_files($this->context->id) ) {
 539             $result = false;
 540         }
 541
 542         // delete_records will throw an exception if it fails - so no need for error checking here
 543
 544         $DB->delete_records('assign_submission', array('assignment'=>$this->get_instance()->id));
 545         $DB->delete_records('assign_grades', array('assignment'=>$this->get_instance()->id));
 546         $DB->delete_records('assign_plugin_config', array('assignment'=>$this->get_instance()->id));
 547
 548         // delete items from the gradebook
 549         if (! $this->delete_grades()) {
 550             $result = false;
 551         }
 552
 553         // delete the instance
 554         $DB->delete_records('assign', array('id'=>$this->get_instance()->id));
 555
 556         return $result;
 557     }
 558
 559     /**
 560     * Actual implementation of the reset course functionality, delete all the
 561     * assignment submissions for course $data->courseid.
 562     *
 563     * @param $data the data submitted from the reset course.
 564     * @return array status array
 565     */
 566     public function reset_userdata($data) {
 567         global $CFG,$DB;
 568
 569         $componentstr = get_string('modulenameplural', 'assign');
 570         $status = array();
 571
 572         $fs = get_file_storage();
 573         if (!empty($data->reset_assign_submissions)) {
 574             // Delete files associated with this assignment.
 575             foreach ($this->submissionplugins as $plugin) {
 576                 $fileareas = array();
 577                 $plugincomponent = $plugin->get_subtype() . '_' . $plugin->get_type();
 578                 $fileareas = $plugin->get_file_areas();
 579                 foreach ($fileareas as $filearea) {
 580                     $fs->delete_area_files($this->context->id, $plugincomponent, $filearea);
 581                 }
 582
 583                 if (!$plugin->delete_instance()) {
 584                     $status[] = array('component'=>$componentstr,
 585                                       'item'=>get_string('deleteallsubmissions','assign'),
 586                                       'error'=>$plugin->get_error());
 587                 }
 588             }
 589
 590             foreach ($this->feedbackplugins as $plugin) {
 591                 $fileareas = array();
 592                 $plugincomponent = $plugin->get_subtype() . '_' . $plugin->get_type();
 593                 $fileareas = $plugin->get_file_areas();
 594                 foreach ($fileareas as $filearea) {
 595                     $fs->delete_area_files($this->context->id, $plugincomponent, $filearea);
 596                 }
 597
 598                 if (!$plugin->delete_instance()) {
 599                     $status[] = array('component'=>$componentstr,
 600                                       'item'=>get_string('deleteallsubmissions','assign'),
 601                                       'error'=>$plugin->get_error());
 602                 }
 603             }
 604
 605             $assignssql = "SELECT a.id
 606                              FROM {assign} a
 607                            WHERE a.course=:course";
 608             $params = array ("course" => $data->courseid);
 609
 610             $DB->delete_records_select('assign_submission', "assignment IN ($assignssql)", $params);
 611             $status[] = array('component'=>$componentstr,
 612                               'item'=>get_string('deleteallsubmissions','assign'),
 613                               'error'=>false);
 614
 615             if (empty($data->reset_gradebook_grades)) {
 616                 // Remove all grades from gradebook.
 617                 require_once($CFG->dirroot.'/mod/assign/lib.php');
 618                 assign_reset_gradebook($data->courseid);
 619             }
 620         }
 621         // Updating dates - shift may be negative too.
 622         if ($data->timeshift) {
 623             shift_course_mod_dates('assign',
 624                                     array('duedate', 'allowsubmissionsfromdate','cutoffdate'),
 625                                     $data->timeshift,
 626                                     $data->courseid);
 627             $status[] = array('component'=>$componentstr,
 628                               'item'=>get_string('datechanged'),
 629                               'error'=>false);
 630         }
 631
 632         return $status;
 633     }
 634
 635     /**
 636      * Update the settings for a single plugin
 637      *
 638      * @param assign_plugin $plugin The plugin to update
 639      * @param stdClass $formdata The form data
 640      * @return bool false if an error occurs
 641      */
 642     private function update_plugin_instance(assign_plugin $plugin, stdClass $formdata) {
 643         if ($plugin->is_visible()) {
 644             $enabledname = $plugin->get_subtype() . '_' . $plugin->get_type() . '_enabled';
 645             if ($formdata->$enabledname) {
 646                 $plugin->enable();
 647                 if (!$plugin->save_settings($formdata)) {
 648                     print_error($plugin->get_error());
 649                     return false;
 650                 }
 651             } else {
 652                 $plugin->disable();
 653             }
 654         }
 655         return true;
 656     }
 657
 658     /**
 659      * Update the gradebook information for this assignment
 660      *
 661      * @param bool $reset If true, will reset all grades in the gradbook for this assignment
 662      * @param int $coursemoduleid This is required because it might not exist in the database yet
 663      * @return bool
 664      */
 665     public function update_gradebook($reset, $coursemoduleid) {
 666          global $CFG;
 667         /** Include lib.php */
 668         require_once($CFG->dirroot.'/mod/assign/lib.php');
 669         $assign = clone $this->get_instance();
 670         $assign->cmidnumber = $coursemoduleid;
 671         $param = null;
 672         if ($reset) {
 673             $param = 'reset';
 674         }
 675
 676         return assign_grade_item_update($assign, $param);
 677     }
 678
 679     /** Load and cache the admin config for this module
 680      *
 681      * @return stdClass the plugin config
 682      */
 683     public function get_admin_config() {
 684         if ($this->adminconfig) {
 685             return $this->adminconfig;
 686         }
 687         $this->adminconfig = get_config('assign');
 688         return $this->adminconfig;
 689     }
 690
 691
 692     /**
 693      * Update the calendar entries for this assignment
 694      *
 695      * @param int $coursemoduleid - Required to pass this in because it might not exist in the database yet
 696      * @return bool
 697      */
 698     public function update_calendar($coursemoduleid) {
 699         global $DB, $CFG;
 700         require_once($CFG->dirroot.'/calendar/lib.php');
 701
 702         // special case for add_instance as the coursemodule has not been set yet.
 703
 704         if ($this->get_instance()->duedate) {
 705             $event = new stdClass();
 706
 707             if ($event->id = $DB->get_field('event', 'id', array('modulename'=>'assign', 'instance'=>$this->get_instance()->id))) {
 708
 709                 $event->name        = $this->get_instance()->name;
 710
 711                 $event->description = format_module_intro('assign', $this->get_instance(), $coursemoduleid);
 712                 $event->timestart   = $this->get_instance()->duedate;
 713
 714                 $calendarevent = calendar_event::load($event->id);
 715                 $calendarevent->update($event);
 716             } else {
 717                 $event = new stdClass();
 718                 $event->name        = $this->get_instance()->name;
 719                 $event->description = format_module_intro('assign', $this->get_instance(), $coursemoduleid);
 720                 $event->courseid    = $this->get_instance()->course;
 721                 $event->groupid     = 0;
 722                 $event->userid      = 0;
 723                 $event->modulename  = 'assign';
 724                 $event->instance    = $this->get_instance()->id;
 725                 $event->eventtype   = 'due';
 726                 $event->timestart   = $this->get_instance()->duedate;
 727                 $event->timeduration = 0;
 728
 729                 calendar_event::create($event);
 730             }
 731         } else {
 732             $DB->delete_records('event', array('modulename'=>'assign', 'instance'=>$this->get_instance()->id));
 733         }
 734     }
 735
 736
 737     /**
 738      * Update this instance in the database
 739      *
 740      * @param stdClass $formdata - the data submitted from the form
 741      * @return bool false if an error occurs
 742      */
 743     public function update_instance($formdata) {
 744         global $DB;
 745
 746         $update = new stdClass();
 747         $update->id = $formdata->instance;
 748         $update->name = $formdata->name;
 749         $update->timemodified = time();
 750         $update->course = $formdata->course;
 751         $update->intro = $formdata->intro;
 752         $update->introformat = $formdata->introformat;
 753         $update->alwaysshowdescription = $formdata->alwaysshowdescription;
 754         $update->submissiondrafts = $formdata->submissiondrafts;
 755         $update->requiresubmissionstatement = $formdata->requiresubmissionstatement;
 756         $update->sendnotifications = $formdata->sendnotifications;
 757         $update->sendlatenotifications = $formdata->sendlatenotifications;
 758         $update->duedate = $formdata->duedate;
 759         $update->cutoffdate = $formdata->cutoffdate;
 760         $update->allowsubmissionsfromdate = $formdata->allowsubmissionsfromdate;
 761         $update->grade = $formdata->grade;
 762         $update->completionsubmit = !empty($formdata->completionsubmit);
 763         $update->teamsubmission = $formdata->teamsubmission;
 764         $update->requireallteammemberssubmit = $formdata->requireallteammemberssubmit;
 765         $update->teamsubmissiongroupingid = $formdata->teamsubmissiongroupingid;
 766         $update->blindmarking = $formdata->blindmarking;
 767
 768         $result = $DB->update_record('assign', $update);
 769         $this->instance = $DB->get_record('assign', array('id'=>$update->id), '*', MUST_EXIST);
 770
 771         // load the assignment so the plugins have access to it
 772
 773         // call save_settings hook for submission plugins
 774         foreach ($this->submissionplugins as $plugin) {
 775             if (!$this->update_plugin_instance($plugin, $formdata)) {
 776                 print_error($plugin->get_error());
 777                 return false;
 778             }
 779         }
 780         foreach ($this->feedbackplugins as $plugin) {
 781             if (!$this->update_plugin_instance($plugin, $formdata)) {
 782                 print_error($plugin->get_error());
 783                 return false;
 784             }
 785         }
 786
 787
 788         // update the database record
 789
 790
 791         // update all the calendar events
 792         $this->update_calendar($this->get_course_module()->id);
 793
 794         $this->update_gradebook(false, $this->get_course_module()->id);
 795
 796         $update = new stdClass();
 797         $update->id = $this->get_instance()->id;
 798         $update->nosubmissions = (!$this->is_any_submission_plugin_enabled()) ? 1: 0;
 799         $DB->update_record('assign', $update);
 800
 801
 802
 803
 804
 805         return $result;
 806     }
 807
 808     /**
 809      * add elements in grading plugin form
 810      *
 811      * @param mixed $grade stdClass|null
 812      * @param MoodleQuickForm $mform
 813      * @param stdClass $data
 814      * @param int $userid - The userid we are grading
 815      * @return void
 816      */
 817     private function add_plugin_grade_elements($grade, MoodleQuickForm $mform, stdClass $data, $userid) {
 818         foreach ($this->feedbackplugins as $plugin) {
 819             if ($plugin->is_enabled() && $plugin->is_visible()) {
 820                 $mform->addElement('header', 'header_' . $plugin->get_type(), $plugin->get_name());
 821                 if (!$plugin->get_form_elements_for_user($grade, $mform, $data, $userid)) {
 822                     $mform->removeElement('header_' . $plugin->get_type());
 823                 }
 824             }
 825         }
 826     }
 827
 828
 829
 830     /**
 831      * Add one plugins settings to edit plugin form
 832      *
 833      * @param assign_plugin $plugin The plugin to add the settings from
 834      * @param MoodleQuickForm $mform The form to add the configuration settings to. This form is modified directly (not returned)
 835      * @return void
 836      */
 837     private function add_plugin_settings(assign_plugin $plugin, MoodleQuickForm $mform) {
 838         global $CFG;
 839         if ($plugin->is_visible()) {
 840             // enabled
 841             //tied disableIf rule to this select element
 842             $mform->addElement('selectyesno', $plugin->get_subtype() . '_' . $plugin->get_type() . '_enabled', $plugin->get_name());
 843             $mform->addHelpButton($plugin->get_subtype() . '_' . $plugin->get_type() . '_enabled', 'enabled', $plugin->get_subtype() . '_' . $plugin->get_type());
 844
 845
 846             $default = get_config($plugin->get_subtype() . '_' . $plugin->get_type(), 'default');
 847             if ($plugin->get_config('enabled') !== false) {
 848                 $default = $plugin->is_enabled();
 849             }
 850             $mform->setDefault($plugin->get_subtype() . '_' . $plugin->get_type() . '_enabled', $default);
 851
 852             $plugin->get_settings($mform);
 853
 854         }
 855
 856     }
 857
 858
 859     /**
 860      * Add settings to edit plugin form
 861      *
 862      * @param MoodleQuickForm $mform The form to add the configuration settings to. This form is modified directly (not returned)
 863      * @return void
 864      */
 865     public function add_all_plugin_settings(MoodleQuickForm $mform) {
 866         $mform->addElement('header', 'general', get_string('submissionsettings', 'assign'));
 867
 868         foreach ($this->submissionplugins as $plugin) {
 869             $this->add_plugin_settings($plugin, $mform);
 870
 871         }
 872         $mform->addElement('header', 'general', get_string('feedbacksettings', 'assign'));
 873         foreach ($this->feedbackplugins as $plugin) {
 874             $this->add_plugin_settings($plugin, $mform);
 875         }
 876     }
 877
 878     /**
 879      * Allow each plugin an opportunity to update the defaultvalues
 880      * passed in to the settings form (needed to set up draft areas for
 881      * editor and filemanager elements)
 882      * @param array $defaultvalues
 883      */
 884     public function plugin_data_preprocessing(&$defaultvalues) {
 885         foreach ($this->submissionplugins as $plugin) {
 886             if ($plugin->is_visible()) {
 887                 $plugin->data_preprocessing($defaultvalues);
 888             }
 889         }
 890         foreach ($this->feedbackplugins as $plugin) {
 891             if ($plugin->is_visible()) {
 892                 $plugin->data_preprocessing($defaultvalues);
 893             }
 894         }
 895     }
 896
 897     /**
 898      * Get the name of the current module.
 899      *
 900      * @return string the module name (Assignment)
 901      */
 902     protected function get_module_name() {
 903         if (isset(self::$modulename)) {
 904             return self::$modulename;
 905         }
 906         self::$modulename = get_string('modulename', 'assign');
 907         return self::$modulename;
 908     }
 909
 910     /**
 911      * Get the plural name of the current module.
 912      *
 913      * @return string the module name plural (Assignments)
 914      */
 915     protected function get_module_name_plural() {
 916         if (isset(self::$modulenameplural)) {
 917             return self::$modulenameplural;
 918         }
 919         self::$modulenameplural = get_string('modulenameplural', 'assign');
 920         return self::$modulenameplural;
 921     }
 922
 923     /**
 924      * Has this assignment been constructed from an instance?
 925      *
 926      * @return bool
 927      */
 928     public function has_instance() {
 929         return $this->instance || $this->get_course_module();
 930     }
 931
 932     /**
 933      * Get the settings for the current instance of this assignment
 934      *
 935      * @return stdClass The settings
 936      */
 937     public function get_instance() {
 938         global $DB;
 939         if ($this->instance) {
 940             return $this->instance;
 941         }
 942         if ($this->get_course_module()) {
 943             $this->instance = $DB->get_record('assign', array('id' => $this->get_course_module()->instance), '*', MUST_EXIST);
 944         }
 945         if (!$this->instance) {
 946             throw new coding_exception('Improper use of the assignment class. Cannot load the assignment record.');
 947         }
 948         return $this->instance;
 949     }
 950
 951     /**
 952      * Get the context of the current course
 953      * @return mixed context|null The course context
 954      */
 955     public function get_course_context() {
 956         if (!$this->context && !$this->course) {
 957             throw new coding_exception('Improper use of the assignment class. Cannot load the course context.');
 958         }
 959         if ($this->context) {
 960             return $this->context->get_course_context();
 961         } else {
 962             return context_course::instance($this->course->id);
 963         }
 964     }
 965
 966
 967     /**
 968      * Get the current course module
 969      *
 970      * @return mixed stdClass|null The course module
 971      */
 972     public function get_course_module() {
 973         if ($this->coursemodule) {
 974             return $this->coursemodule;
 975         }
 976         if (!$this->context) {
 977             return null;
 978         }
 979
 980         if ($this->context->contextlevel == CONTEXT_MODULE) {
 981             $this->coursemodule = get_coursemodule_from_id('assign', $this->context->instanceid, 0, false, MUST_EXIST);
 982             return $this->coursemodule;
 983         }
 984         return null;
 985     }
 986
 987     /**
 988      * Get context module
 989      *
 990      * @return context
 991      */
 992     public function get_context() {
 993         return $this->context;
 994     }
 995
 996     /**
 997      * Get the current course
 998      * @return mixed stdClass|null The course
 999      */
1000     public function get_course() {
1001         global $DB;
1002         if ($this->course) {
1003             return $this->course;
1004         }
1005
1006         if (!$this->context) {
1007             return null;
1008         }
1009         $this->course = $DB->get_record('course', array('id' => $this->get_course_context()->instanceid), '*', MUST_EXIST);
1010         return $this->course;
1011     }
1012
1013     /**
1014      * Return a grade in user-friendly form, whether it's a scale or not
1015      *
1016      * @param mixed $grade int|null
1017      * @param boolean $editing Are we allowing changes to this grade?
1018      * @param int $userid The user id the grade belongs to
1019      * @param int $modified Timestamp from when the grade was last modified
1020      * @return string User-friendly representation of grade
1021      */
1022     public function display_grade($grade, $editing, $userid=0, $modified=0) {
1023         global $DB;
1024
1025         static $scalegrades = array();
1026
1027         $o = '';
1028
1029         if ($this->get_instance()->grade >= 0) {
1030             // Normal number
1031             if ($editing && $this->get_instance()->grade > 0) {
1032                 if ($grade < 0) {
1033                     $displaygrade = '';
1034                 } else {
1035                     $displaygrade = format_float($grade);
1036                 }
1037                 $o .= '<label class="accesshide" for="quickgrade_' . $userid . '">' . get_string('usergrade', 'assign') . '</label>';
1038                 $o .= '<input type="text" id="quickgrade_' . $userid . '" name="quickgrade_' . $userid . '" value="' .
1039                       $displaygrade . '" size="6" maxlength="10" class="quickgrade"/>';
1040                 $o .= '&nbsp;/&nbsp;' . format_float($this->get_instance()->grade,2);
1041                 $o .= '<input type="hidden" name="grademodified_' . $userid . '" value="' . $modified . '"/>';
1042                 return $o;
1043             } else {
1044                 $o .= '<input type="hidden" name="grademodified_' . $userid . '" value="' . $modified . '"/>';
1045                 if ($grade == -1 || $grade === null) {
1046                     $o .= '-';
1047                     return $o;
1048                 } else {
1049                     $o .= format_float(($grade),2) .'&nbsp;/&nbsp;'. format_float($this->get_instance()->grade,2);
1050                     return $o;
1051                 }
1052             }
1053
1054         } else {
1055             // Scale
1056             if (empty($this->cache['scale'])) {
1057                 if ($scale = $DB->get_record('scale', array('id'=>-($this->get_instance()->grade)))) {
1058                     $this->cache['scale'] = make_menu_from_list($scale->scale);
1059                 } else {
1060                     $o .= '-';
1061                     return $o;
1062                 }
1063             }
1064             if ($editing) {
1065                 $o .= '<label class="accesshide" for="quickgrade_' . $userid . '">' . get_string('usergrade', 'assign') . '</label>';
1066                 $o .= '<select name="quickgrade_' . $userid . '" class="quickgrade">';
1067                 $o .= '<option value="-1">' . get_string('nograde') . '</option>';
1068                 foreach ($this->cache['scale'] as $optionid => $option) {
1069                     $selected = '';
1070                     if ($grade == $optionid) {
1071                         $selected = 'selected="selected"';
1072                     }
1073                     $o .= '<option value="' . $optionid . '" ' . $selected . '>' . $option . '</option>';
1074                 }
1075                 $o .= '</select>';
1076                 $o .= '<input type="hidden" name="grademodified_' . $userid . '" value="' . $modified . '"/>';
1077                 return $o;
1078             } else {
1079                 $scaleid = (int)$grade;
1080                 if (isset($this->cache['scale'][$scaleid])) {
1081                     $o .= $this->cache['scale'][$scaleid];
1082                     return $o;
1083                 }
1084                 $o .= '-';
1085                 return $o;
1086             }
1087         }
1088     }
1089
1090     /**
1091      * Load a list of users enrolled in the current course with the specified permission and group (0 for no group)
1092      *
1093      * @param int $currentgroup
1094      * @param bool $idsonly
1095      * @return array List of user records
1096      */
1097     public function list_participants($currentgroup, $idsonly) {
1098         if ($idsonly) {
1099             return get_enrolled_users($this->context, "mod/assign:submit", $currentgroup, 'u.id');
1100         } else {
1101             return get_enrolled_users($this->context, "mod/assign:submit", $currentgroup);
1102         }
1103     }
1104
1105     /**
1106      * Load a count of valid teams for this assignment
1107      *
1108      * @return int number of valid teams
1109      */
1110     public function count_teams() {
1111
1112         $groups = groups_get_all_groups($this->get_course()->id, 0, $this->get_instance()->teamsubmissiongroupingid, 'g.id');
1113         $count = count($groups);
1114
1115         // See if there are any users in the default group.
1116         $defaultusers = $this->get_submission_group_members(0, true);
1117         if (count($defaultusers) > 0) {
1118             $count += 1;
1119         }
1120         return $count;
1121     }
1122
1123     /**
1124      * Load a count of users enrolled in the current course with the specified permission and group (0 for no group)
1125      *
1126      * @param int $currentgroup
1127      * @return int number of matching users
1128      */
1129     public function count_participants($currentgroup) {
1130         return count_enrolled_users($this->context, "mod/assign:submit", $currentgroup);
1131     }
1132
1133     /**
1134      * Load a count of users submissions in the current module that require grading
1135      * This means the submission modification time is more recent than the
1136      * grading modification time and the status is SUBMITTED.
1137      *
1138      * @return int number of matching submissions
1139      */
1140     public function count_submissions_need_grading() {
1141         global $DB;
1142
1143         if ($this->get_instance()->teamsubmission) {
1144             // This does not make sense for group assignment because the submission is shared.
1145             return 0;
1146         }
1147
1148         $currentgroup = groups_get_activity_group($this->get_course_module(), true);
1149         list($esql, $params) = get_enrolled_sql($this->get_context(), 'mod/assign:submit', $currentgroup, false);
1150
1151         $params['assignid'] = $this->get_instance()->id;
1152         $params['submitted'] = ASSIGN_SUBMISSION_STATUS_SUBMITTED;
1153
1154         $sql = 'SELECT COUNT(s.userid)
1155                    FROM {assign_submission} s
1156                    LEFT JOIN {assign_grades} g ON
1157                         s.assignment = g.assignment AND
1158                         s.userid = g.userid
1159                    JOIN(' . $esql . ') e ON e.id = s.userid
1160                    WHERE
1161                         s.assignment = :assignid AND
1162                         s.timemodified IS NOT NULL AND
1163                         s.status = :submitted AND
1164                         (s.timemodified > g.timemodified OR g.timemodified IS NULL)';
1165
1166         return $DB->count_records_sql($sql, $params);
1167     }
1168
1169     /**
1170      * Load a count of grades
1171      *
1172      * @return int number of grades
1173      */
1174     public function count_grades() {
1175         global $DB;
1176
1177         if (!$this->has_instance()) {
1178             return 0;
1179         }
1180
1181         $currentgroup = groups_get_activity_group($this->get_course_module(), true);
1182         list($esql, $params) = get_enrolled_sql($this->get_context(), 'mod/assign:submit', $currentgroup, false);
1183
1184         $params['assignid'] = $this->get_instance()->id;
1185
1186         $sql = 'SELECT COUNT(g.userid)
1187                    FROM {assign_grades} g
1188                    JOIN(' . $esql . ') e ON e.id = g.userid
1189                    WHERE g.assignment = :assignid';
1190
1191         return $DB->count_records_sql($sql, $params);
1192     }
1193
1194     /**
1195      * Load a count of submissions
1196      *
1197      * @return int number of submissions
1198      */
1199     public function count_submissions() {
1200         global $DB;
1201
1202         if (!$this->has_instance()) {
1203             return 0;
1204         }
1205
1206         $params = array();
1207
1208         if ($this->get_instance()->teamsubmission) {
1209             // We cannot join on the enrolment tables for group submissions (no userid).
1210             $sql = 'SELECT COUNT(s.groupid)
1211                         FROM {assign_submission} s
1212                         WHERE
1213                             s.assignment = :assignid AND
1214                             s.timemodified IS NOT NULL AND
1215                             s.userid = :groupuserid';
1216
1217             $params['assignid'] = $this->get_instance()->id;
1218             $params['groupuserid'] = 0;
1219         } else {
1220             $currentgroup = groups_get_activity_group($this->get_course_module(), true);
1221             list($esql, $params) = get_enrolled_sql($this->get_context(), 'mod/assign:submit', $currentgroup, false);
1222
1223             $params['assignid'] = $this->get_instance()->id;
1224
1225             $sql = 'SELECT COUNT(s.userid)
1226                        FROM {assign_submission} s
1227                        JOIN(' . $esql . ') e ON e.id = s.userid
1228                        WHERE
1229                             s.assignment = :assignid AND
1230                             s.timemodified IS NOT NULL';
1231         }
1232
1233         return $DB->count_records_sql($sql, $params);
1234     }
1235
1236     /**
1237      * Load a count of submissions with a specified status
1238      *
1239      * @param string $status The submission status - should match one of the constants
1240      * @return int number of matching submissions
1241      */
1242     public function count_submissions_with_status($status) {
1243         global $DB;
1244
1245         $currentgroup = groups_get_activity_group($this->get_course_module(), true);
1246         list($esql, $params) = get_enrolled_sql($this->get_context(), 'mod/assign:submit', $currentgroup, false);
1247
1248         $params['assignid'] = $this->get_instance()->id;
1249         $params['submissionstatus'] = $status;
1250
1251         if ($this->get_instance()->teamsubmission) {
1252             $sql = 'SELECT COUNT(s.groupid)
1253                         FROM {assign_submission} s
1254                         WHERE
1255                             s.assignment = :assignid AND
1256                             s.timemodified IS NOT NULL AND
1257                             s.userid = :groupuserid AND
1258                             s.status = :submissionstatus';
1259             $params['groupuserid'] = 0;
1260         } else {
1261             $sql = 'SELECT COUNT(s.userid)
1262                         FROM {assign_submission} s
1263                         JOIN(' . $esql . ') e ON e.id = s.userid
1264                         WHERE
1265                             s.assignment = :assignid AND
1266                             s.timemodified IS NOT NULL AND
1267                             s.status = :submissionstatus';
1268         }
1269
1270         return $DB->count_records_sql($sql, $params);
1271     }
1272
1273     /**
1274      * Utility function to get the userid for every row in the grading table
1275      * so the order can be frozen while we iterate it
1276      *
1277      * @return array An array of userids
1278      */
1279     private function get_grading_userid_list() {
1280         $filter = get_user_preferences('assign_filter', '');
1281         $table = new assign_grading_table($this, 0, $filter, 0, false);
1282
1283         $useridlist = $table->get_column_data('userid');
1284
1285         return $useridlist;
1286     }
1287
1288
1289     /**
1290      * Utility function get the userid based on the row number of the grading table.
1291      * This takes into account any active filters on the table.
1292      *
1293      * @param int $num The row number of the user
1294      * @param bool $last This is set to true if this is the last user in the table
1295      * @return mixed The user id of the matching user or false if there was an error
1296      */
1297     private function get_userid_for_row($num, $last) {
1298         if (!array_key_exists('userid_for_row', $this->cache)) {
1299             $this->cache['userid_for_row'] = array();
1300         }
1301         if (array_key_exists($num, $this->cache['userid_for_row'])) {
1302             list($userid, $last) = $this->cache['userid_for_row'][$num];
1303             return $userid;
1304         }
1305
1306         $filter = get_user_preferences('assign_filter', '');
1307         $table = new assign_grading_table($this, 0, $filter, 0, false);
1308
1309         $userid = $table->get_cell_data($num, 'userid', $last);
1310
1311         $this->cache['userid_for_row'][$num] = array($userid, $last);
1312         return $userid;
1313     }
1314
1315     /**
1316      * Generate zip file from array of given files
1317      *
1318      * @param array $filesforzipping - array of files to pass into archive_to_pathname - this array is indexed by the final file name and each element in the array is an instance of a stored_file object
1319      * @return path of temp file - note this returned file does not have a .zip extension - it is a temp file.
1320      */
1321      private function pack_files($filesforzipping) {
1322          global $CFG;
1323          //create path for new zip file.
1324          $tempzip = tempnam($CFG->tempdir.'/', 'assignment_');
1325          //zip files
1326          $zipper = new zip_packer();
1327          if ($zipper->archive_to_pathname($filesforzipping, $tempzip)) {
1328              return $tempzip;
1329          }
1330          return false;
1331     }
1332
1333     /**
1334      * Finds all assignment notifications that have yet to be mailed out, and mails them.
1335      *
1336      * Cron function to be run periodically according to the moodle cron
1337      *
1338      * @return bool
1339      */
1340     static function cron() {
1341         global $DB;
1342
1343         // only ever send a max of one days worth of updates
1344         $yesterday = time() - (24 * 3600);
1345         $timenow   = time();
1346
1347         // Collect all submissions from the past 24 hours that require mailing.
1348         $sql = "SELECT s.*, a.course, a.name, a.blindmarking, a.revealidentities,
1349                        g.*, g.id as gradeid, g.timemodified as lastmodified
1350                  FROM {assign} a
1351                  JOIN {assign_grades} g ON g.assignment = a.id
1352             LEFT JOIN {assign_submission} s ON s.assignment = a.id AND s.userid = g.userid
1353                 WHERE g.timemodified >= :yesterday AND
1354                       g.timemodified <= :today AND
1355                       g.mailed = 0";
1356         $params = array('yesterday' => $yesterday, 'today' => $timenow);
1357         $submissions = $DB->get_records_sql($sql, $params);
1358
1359         if (empty($submissions)) {
1360             mtrace('done.');
1361             return true;
1362         }
1363
1364         mtrace('Processing ' . count($submissions) . ' assignment submissions ...');
1365
1366         // Preload courses we are going to need those.
1367         $courseids = array();
1368         foreach ($submissions as $submission) {
1369             $courseids[] = $submission->course;
1370         }
1371         // Filter out duplicates
1372         $courseids = array_unique($courseids);
1373         $ctxselect = context_helper::get_preload_record_columns_sql('ctx');
1374         list($courseidsql, $params) = $DB->get_in_or_equal($courseids, SQL_PARAMS_NAMED);
1375         $sql = "SELECT c.*, {$ctxselect}
1376                   FROM {course} c
1377              LEFT JOIN {context} ctx ON ctx.instanceid = c.id AND ctx.contextlevel = :contextlevel
1378                  WHERE c.id {$courseidsql}";
1379         $params['contextlevel'] = CONTEXT_COURSE;
1380         $courses = $DB->get_records_sql($sql, $params);
1381         // Clean up... this could go on for a while.
1382         unset($courseids);
1383         unset($ctxselect);
1384         unset($courseidsql);
1385         unset($params);
1386
1387         // Simple array we'll use for caching modules.
1388         $modcache = array();
1389
1390         // Message students about new feedback
1391         foreach ($submissions as $submission) {
1392
1393             mtrace("Processing assignment submission $submission->id ...");
1394
1395             // do not cache user lookups - could be too many
1396             if (!$user = $DB->get_record("user", array("id"=>$submission->userid))) {
1397                 mtrace("Could not find user $submission->userid");
1398                 continue;
1399             }
1400
1401             // use a cache to prevent the same DB queries happening over and over
1402             if (!array_key_exists($submission->course, $courses)) {
1403                 mtrace("Could not find course $submission->course");
1404                 continue;
1405             }
1406             $course = $courses[$submission->course];
1407             if (isset($course->ctxid)) {
1408                 // Context has not yet been preloaded. Do so now.
1409                 context_helper::preload_from_record($course);
1410             }
1411
1412             // Override the language and timezone of the "current" user, so that
1413             // mail is customised for the receiver.
1414             cron_setup_user($user, $course);
1415
1416             // context lookups are already cached
1417             $coursecontext = context_course::instance($course->id);
1418             if (!is_enrolled($coursecontext, $user->id)) {
1419                 $courseshortname = format_string($course->shortname, true, array('context' => $coursecontext));
1420                 mtrace(fullname($user)." not an active participant in " . $courseshortname);
1421                 continue;
1422             }
1423
1424             if (!$grader = $DB->get_record("user", array("id"=>$submission->grader))) {
1425                 mtrace("Could not find grader $submission->grader");
1426                 continue;
1427             }
1428
1429             if (!array_key_exists($submission->assignment, $modcache)) {
1430                 if (! $mod = get_coursemodule_from_instance("assign", $submission->assignment, $course->id)) {
1431                     mtrace("Could not find course module for assignment id $submission->assignment");
1432                     continue;
1433                 }
1434                 $modcache[$submission->assignment] = $mod;
1435             } else {
1436                 $mod = $modcache[$submission->assignment];
1437             }
1438             // context lookups are already cached
1439             $contextmodule = context_module::instance($mod->id);
1440
1441             if (!$mod->visible) {
1442                 // Hold mail notification for hidden assignments until later
1443                 continue;
1444             }
1445
1446             // need to send this to the student
1447             $messagetype = 'feedbackavailable';
1448             $eventtype = 'assign_notification';
1449             $updatetime = $submission->lastmodified;
1450             $modulename = get_string('modulename', 'assign');
1451
1452             $uniqueid = 0;
1453             if ($submission->blindmarking && !$submission->revealidentities) {
1454                 $uniqueid = self::get_uniqueid_for_user_static($submission->assignment, $user->id);
1455             }
1456             self::send_assignment_notification($grader, $user, $messagetype, $eventtype, $updatetime,
1457                                                $mod, $contextmodule, $course, $modulename, $submission->name,
1458                                                $submission->blindmarking && !$submission->revealidentities,
1459                                                $uniqueid);
1460
1461             $grade = new stdClass();
1462             $grade->id = $submission->gradeid;
1463             $grade->mailed = 1;
1464             $DB->update_record('assign_grades', $grade);
1465
1466             mtrace('Done');
1467         }
1468         mtrace('Done processing ' . count($submissions) . ' assignment submissions');
1469
1470         cron_setup_user();
1471
1472         // Free up memory just to be sure
1473         unset($courses);
1474         unset($modcache);
1475
1476         return true;
1477     }
1478
1479     /**
1480      * Update a grade in the grade table for the assignment and in the gradebook
1481      *
1482      * @param stdClass $grade a grade record keyed on id
1483      * @return bool true for success
1484      */
1485     public function update_grade($grade) {
1486         global $DB;
1487
1488         $grade->timemodified = time();
1489
1490         if ($grade->grade && $grade->grade != -1) {
1491             if ($this->get_instance()->grade > 0) {
1492                 if (!is_numeric($grade->grade)) {
1493                     return false;
1494                 } else if ($grade->grade > $this->get_instance()->grade) {
1495                     return false;
1496                 } else if ($grade->grade < 0) {
1497                     return false;
1498                 }
1499             } else {
1500                 // this is a scale
1501                 if ($scale = $DB->get_record('scale', array('id' => -($this->get_instance()->grade)))) {
1502                     $scaleoptions = make_menu_from_list($scale->scale);
1503                     if (!array_key_exists((int) $grade->grade, $scaleoptions)) {
1504                         return false;
1505                     }
1506                 }
1507             }
1508         }
1509
1510         $result = $DB->update_record('assign_grades', $grade);
1511         if ($result) {
1512             $this->gradebook_item_update(null, $grade);
1513         }
1514         return $result;
1515     }
1516
1517     /**
1518      * View the grant extension date page
1519      *
1520      * Uses url parameters 'userid'
1521      * or from parameter 'selectedusers'
1522      * @param moodleform $mform - Used for validation of the submitted data
1523      * @return string
1524      */
1525     private function view_grant_extension($mform) {
1526         global $DB, $CFG;
1527         require_once($CFG->dirroot . '/mod/assign/extensionform.php');
1528
1529         $o = '';
1530         $batchusers = optional_param('selectedusers', '', PARAM_TEXT);
1531         $data = new stdClass();
1532         $data->extensionduedate = null;
1533         $userid = 0;
1534         if (!$batchusers) {
1535             $userid = required_param('userid', PARAM_INT);
1536
1537             $grade = $this->get_user_grade($userid, false);
1538
1539             $user = $DB->get_record('user', array('id'=>$userid), '*', MUST_EXIST);
1540
1541             if ($grade) {
1542                 $data->extensionduedate = $grade->extensionduedate;
1543             }
1544             $data->userid = $userid;
1545         } else {
1546             $data->batchusers = $batchusers;
1547         }
1548         $o .= $this->get_renderer()->render(new assign_header($this->get_instance(),
1549                                                       $this->get_context(),
1550                                                       $this->show_intro(),
1551                                                       $this->get_course_module()->id,
1552                                                       get_string('grantextension', 'assign')));
1553
1554         if (!$mform) {
1555             $mform = new mod_assign_extension_form(null, array($this->get_course_module()->id,
1556                                                                $userid,
1557                                                                $batchusers,
1558                                                                $this->get_instance(),
1559                                                                $data));
1560         }
1561         $o .= $this->get_renderer()->render(new assign_form('extensionform', $mform));
1562         $o .= $this->view_footer();
1563         return $o;
1564     }
1565
1566     /**
1567      * Get a list of the users in the same group as this user
1568      *
1569      * @param int $groupid The id of the group whose members we want or 0 for the default group
1570      * @param bool $onlyids Whether to retrieve only the user id's
1571      * @return array The users (possibly id's only)
1572      */
1573     public function get_submission_group_members($groupid, $onlyids) {
1574         $members = array();
1575         if ($groupid != 0) {
1576             if ($onlyids) {
1577                 $allusers = groups_get_members($groupid, 'u.id');
1578             } else {
1579                 $allusers = groups_get_members($groupid);
1580             }
1581             foreach ($allusers as $user) {
1582                 if ($this->get_submission_group($user->id)) {
1583                     $members[] = $user;
1584                 }
1585             }
1586         } else {
1587             $allusers = $this->list_participants(null, $onlyids);
1588             foreach ($allusers as $user) {
1589                 if ($this->get_submission_group($user->id) == null) {
1590                     $members[] = $user;
1591                 }
1592             }
1593         }
1594         return $members;
1595     }
1596
1597     /**
1598      * Get a list of the users in the same group as this user that have not submitted the assignment
1599      *
1600      * @param int $groupid The id of the group whose members we want or 0 for the default group
1601      * @param bool $onlyids Whether to retrieve only the user id's
1602      * @return array The users (possibly id's only)
1603      */
1604     public function get_submission_group_members_who_have_not_submitted($groupid, $onlyids) {
1605         if (!$this->get_instance()->teamsubmission || !$this->get_instance()->requireallteammemberssubmit) {
1606             return array();
1607         }
1608         $members = $this->get_submission_group_members($groupid, $onlyids);
1609
1610         foreach ($members as $id => $member) {
1611             $submission = $this->get_user_submission($member->id, false);
1612             if ($submission && $submission->status != ASSIGN_SUBMISSION_STATUS_DRAFT) {
1613                 unset($members[$id]);
1614             } else {
1615                 if ($this->is_blind_marking()) {
1616                     $members[$id]->alias = get_string('hiddenuser', 'assign') . $this->get_uniqueid_for_user($id);
1617                 }
1618             }
1619         }
1620         return $members;
1621     }
1622
1623     /**
1624      * Load the group submission object for a particular user, optionally creating it if required
1625      *
1626      * This will create the user submission and the group submission if required
1627      *
1628      * @param int $userid The id of the user whose submission we want
1629      * @param int $groupid The id of the group for this user - may be 0 in which case it is determined from the userid
1630      * @param bool $create If set to true a new submission object will be created in the database
1631      * @return stdClass The submission
1632      */
1633     public function get_group_submission($userid, $groupid, $create) {
1634         global $DB;
1635
1636         if ($groupid == 0) {
1637             $group = $this->get_submission_group($userid);
1638             if ($group) {
1639                 $groupid = $group->id;
1640             }
1641         }
1642
1643         if ($create) {
1644             // Make sure there is a submission for this user.
1645             $params = array('assignment'=>$this->get_instance()->id, 'groupid'=>0, 'userid'=>$userid);
1646             $submission = $DB->get_record('assign_submission', $params);
1647
1648             if (!$submission) {
1649                 $submission = new stdClass();
1650                 $submission->assignment   = $this->get_instance()->id;
1651                 $submission->userid       = $userid;
1652                 $submission->groupid      = 0;
1653                 $submission->timecreated  = time();
1654                 $submission->timemodified = $submission->timecreated;
1655
1656                 if ($this->get_instance()->submissiondrafts) {
1657                     $submission->status = ASSIGN_SUBMISSION_STATUS_DRAFT;
1658                 } else {
1659                     $submission->status = ASSIGN_SUBMISSION_STATUS_SUBMITTED;
1660                 }
1661                 $DB->insert_record('assign_submission', $submission);
1662             }
1663         }
1664         // Now get the group submission.
1665         $params = array('assignment'=>$this->get_instance()->id, 'groupid'=>$groupid, 'userid'=>0);
1666         $submission = $DB->get_record('assign_submission', $params);
1667
1668         if ($submission) {
1669             return $submission;
1670         }
1671         if ($create) {
1672             $submission = new stdClass();
1673             $submission->assignment   = $this->get_instance()->id;
1674             $submission->userid       = 0;
1675             $submission->groupid       = $groupid;
1676             $submission->timecreated = time();
1677             $submission->timemodified = $submission->timecreated;
1678
1679             if ($this->get_instance()->submissiondrafts) {
1680                 $submission->status = ASSIGN_SUBMISSION_STATUS_DRAFT;
1681             } else {
1682                 $submission->status = ASSIGN_SUBMISSION_STATUS_SUBMITTED;
1683             }
1684             $sid = $DB->insert_record('assign_submission', $submission);
1685             $submission->id = $sid;
1686             return $submission;
1687         }
1688         return false;
1689     }
1690
1691     /**
1692      * View a summary listing of all assignments in the current course.
1693      *
1694      * @return string
1695      */
1696     private function view_course_index() {
1697         global $USER;
1698
1699         $o = '';
1700
1701         $course = $this->get_course();
1702         $strplural = get_string('modulenameplural', 'assign');
1703
1704         if (!$cms = get_coursemodules_in_course('assign', $course->id, 'm.duedate')) {
1705             $o .= $this->get_renderer()->notification(get_string('thereareno', 'moodle', $strplural));
1706             $o .= $this->get_renderer()->continue_button(new moodle_url('/course/view.php', array('id' => $course->id)));
1707             return $o;
1708         }
1709
1710         $strsectionname  = get_string('sectionname', 'format_'.$course->format);
1711         $usesections = course_format_uses_sections($course->format);
1712         $modinfo = get_fast_modinfo($course);
1713
1714         if ($usesections) {
1715             $sections = $modinfo->get_section_info_all();
1716         }
1717         $courseindexsummary = new assign_course_index_summary($usesections, $strsectionname);
1718
1719         $timenow = time();
1720
1721         $currentsection = '';
1722         foreach ($modinfo->instances['assign'] as $cm) {
1723             if (!$cm->uservisible) {
1724                 continue;
1725             }
1726
1727             $timedue        = $cms[$cm->id]->duedate;
1728
1729             $sectionname = '';
1730             if ($usesections && $cm->sectionnum) {
1731                 $sectionname = get_section_name($course, $sections[$cm->sectionnum]);
1732             }
1733
1734             $submitted = '';
1735             $context = context_module::instance($cm->id);
1736
1737             $assignment = new assign($context, $cm, $course);
1738
1739             if (has_capability('mod/assign:grade', $context)) {
1740                 $submitted = $assignment->count_submissions_with_status(ASSIGN_SUBMISSION_STATUS_SUBMITTED);
1741
1742             } else if (has_capability('mod/assign:submit', $context)) {
1743                 $usersubmission = $assignment->get_user_submission($USER->id, false);
1744
1745                 if (!empty($usersubmission->status)) {
1746                     $submitted = get_string('submissionstatus_' . $usersubmission->status, 'assign');
1747                 } else {
1748                     $submitted = get_string('submissionstatus_', 'assign');
1749                 }
1750             }
1751             $grading_info = grade_get_grades($course->id, 'mod', 'assign', $cm->instance, $USER->id);
1752             if (isset($grading_info->items[0]) && !$grading_info->items[0]->grades[$USER->id]->hidden ) {
1753                 $grade = $grading_info->items[0]->grades[$USER->id]->str_grade;
1754             } else {
1755                 $grade = '-';
1756             }
1757
1758             $courseindexsummary->add_assign_info($cm->id, $cm->name, $sectionname, $timedue, $submitted, $grade);
1759
1760         }
1761
1762         $o .= $this->get_renderer()->render($courseindexsummary);
1763         $o .= $this->view_footer();
1764
1765         return $o;
1766     }
1767
1768     /**
1769      * View a page rendered by a plugin.
1770      *
1771      * Uses url parameters 'pluginaction', 'pluginsubtype', 'plugin', and 'id'
1772      *
1773      * @return string
1774      */
1775     private function view_plugin_page() {
1776         global $USER;
1777
1778         $o = '';
1779
1780         $pluginsubtype = required_param('pluginsubtype', PARAM_ALPHA);
1781         $plugintype = required_param('plugin', PARAM_TEXT);
1782         $pluginaction = required_param('pluginaction', PARAM_ALPHA);
1783
1784         $plugin = $this->get_plugin_by_type($pluginsubtype, $plugintype);
1785         if (!$plugin) {
1786             print_error('invalidformdata', '');
1787             return;
1788         }
1789
1790         $o .= $plugin->view_page($pluginaction);
1791
1792         return $o;
1793     }
1794
1795
1796     /**
1797      * This is used for team assignments to get the group for the specified user.
1798      * If the user is a member of multiple or no groups this will return false
1799      *
1800      * @param int $userid The id of the user whose submission we want
1801      * @return mixed The group or false
1802      */
1803     public function get_submission_group($userid) {
1804         $groups = groups_get_all_groups($this->get_course()->id, $userid, $this->get_instance()->teamsubmissiongroupingid);
1805         if (count($groups) != 1) {
1806             return false;
1807         }
1808         return array_pop($groups);
1809     }
1810
1811
1812     /**
1813      * display the submission that is used by a plugin
1814      * Uses url parameters 'sid', 'gid' and 'plugin'
1815      * @param string $pluginsubtype
1816      * @return string
1817      */
1818     private function view_plugin_content($pluginsubtype) {
1819         global $USER;
1820
1821         $o = '';
1822
1823         $submissionid = optional_param('sid', 0, PARAM_INT);
1824         $gradeid = optional_param('gid', 0, PARAM_INT);
1825         $plugintype = required_param('plugin', PARAM_TEXT);
1826         $item = null;
1827         if ($pluginsubtype == 'assignsubmission') {
1828             $plugin = $this->get_submission_plugin_by_type($plugintype);
1829             if ($submissionid <= 0) {
1830                 throw new coding_exception('Submission id should not be 0');
1831             }
1832             $item = $this->get_submission($submissionid);
1833
1834             // permissions
1835             if ($item->userid != $USER->id) {
1836                 require_capability('mod/assign:grade', $this->context);
1837             }
1838             $o .= $this->get_renderer()->render(new assign_header($this->get_instance(),
1839                                                               $this->get_context(),
1840                                                               $this->show_intro(),
1841                                                               $this->get_course_module()->id,
1842                                                               $plugin->get_name()));
1843             $o .= $this->get_renderer()->render(new assign_submission_plugin_submission($plugin,
1844                                                               $item,
1845                                                               assign_submission_plugin_submission::FULL,
1846                                                               $this->get_course_module()->id,
1847                                                               $this->get_return_action(),
1848                                                               $this->get_return_params()));
1849
1850             $this->add_to_log('view submission', get_string('viewsubmissionforuser', 'assign', $item->userid));
1851         } else {
1852             $plugin = $this->get_feedback_plugin_by_type($plugintype);
1853             if ($gradeid <= 0) {
1854                 throw new coding_exception('Grade id should not be 0');
1855             }
1856             $item = $this->get_grade($gradeid);
1857             // permissions
1858             if ($item->userid != $USER->id) {
1859                 require_capability('mod/assign:grade', $this->context);
1860             }
1861             $o .= $this->get_renderer()->render(new assign_header($this->get_instance(),
1862                                                               $this->get_context(),
1863                                                               $this->show_intro(),
1864                                                               $this->get_course_module()->id,
1865                                                               $plugin->get_name()));
1866             $o .= $this->get_renderer()->render(new assign_feedback_plugin_feedback($plugin,
1867                                                               $item,
1868                                                               assign_feedback_plugin_feedback::FULL,
1869                                                               $this->get_course_module()->id,
1870                                                               $this->get_return_action(),
1871                                                               $this->get_return_params()));
1872             $this->add_to_log('view feedback', get_string('viewfeedbackforuser', 'assign', $item->userid));
1873         }
1874
1875
1876         $o .= $this->view_return_links();
1877
1878         $o .= $this->view_footer();
1879         return $o;
1880     }
1881
1882     /**
1883      * Rewrite plugin file urls so they resolve correctly in an exported zip.
1884      *
1885      * @param stdClass $user - The user record
1886      * @param assign_plugin $plugin - The assignment plugin
1887      */
1888     public function download_rewrite_pluginfile_urls($text, $user, $plugin) {
1889         $groupmode = groups_get_activity_groupmode($this->get_course_module());
1890         $groupname = '';
1891         if ($groupmode) {
1892             $groupid = groups_get_activity_group($this->get_course_module(), true);
1893             $groupname = groups_get_group_name($groupid).'-';
1894         }
1895
1896         if ($this->is_blind_marking()) {
1897             $prefix = $groupname . get_string('participant', 'assign');
1898             $prefix = str_replace('_', ' ', $prefix);
1899             $prefix = clean_filename($prefix . '_' . $this->get_uniqueid_for_user($user->id) . '_');
1900         } else {
1901             $prefix = $groupname . fullname($user);
1902             $prefix = str_replace('_', ' ', $prefix);
1903             $prefix = clean_filename($prefix . '_' . $this->get_uniqueid_for_user($user->id) . '_');
1904         }
1905
1906         $subtype = $plugin->get_subtype();
1907         $type = $plugin->get_type();
1908         $prefix = $prefix . $subtype . '_' . $type . '_';
1909
1910         $result = str_replace('@@PLUGINFILE@@/', $prefix, $text);
1911
1912         return $result;
1913     }
1914
1915     /**
1916      * render the content in editor that is often used by plugin
1917      *
1918      * @param string $filearea
1919      * @param int  $submissionid
1920      * @param string $plugintype
1921      * @param string $editor
1922      * @param string $component
1923      * @return string
1924      */
1925     public function render_editor_content($filearea, $submissionid, $plugintype, $editor, $component) {
1926         global $CFG;
1927
1928         $result = '';
1929
1930         $plugin = $this->get_submission_plugin_by_type($plugintype);
1931
1932         $text = $plugin->get_editor_text($editor, $submissionid);
1933         $format = $plugin->get_editor_format($editor, $submissionid);
1934
1935         $finaltext = file_rewrite_pluginfile_urls($text, 'pluginfile.php', $this->get_context()->id, $component, $filearea, $submissionid);
1936         $result .= format_text($finaltext, $format, array('overflowdiv' => true, 'context' => $this->get_context()));
1937
1938
1939
1940         if ($CFG->enableportfolios) {
1941             require_once($CFG->libdir . '/portfoliolib.php');
1942
1943             $button = new portfolio_add_button();
1944             $button->set_callback_options('assign_portfolio_caller', array('cmid' => $this->get_course_module()->id,
1945                                           'sid' => $submissionid, 'plugin' => $plugintype, 'editor' => $editor, 'area'=>$filearea),
1946                                           'mod_assign');
1947             $fs = get_file_storage();
1948
1949             if ($files = $fs->get_area_files($this->context->id, $component,$filearea, $submissionid, "timemodified", false)) {
1950                 $button->set_formats(PORTFOLIO_FORMAT_RICHHTML);
1951             } else {
1952                 $button->set_formats(PORTFOLIO_FORMAT_PLAINHTML);
1953             }
1954             $result .= $button->to_html();
1955         }
1956         return $result;
1957     }
1958
1959     /**
1960      * Display a grading error
1961      *
1962      * @param string $message - The description of the result
1963      * @return string
1964      */
1965     private function view_quickgrading_result($message) {
1966         $o = '';
1967         $o .= $this->get_renderer()->render(new assign_header($this->get_instance(),
1968                                                       $this->get_context(),
1969                                                       $this->show_intro(),
1970                                                       $this->get_course_module()->id,
1971                                                       get_string('quickgradingresult', 'assign')));
1972         $o .= $this->get_renderer()->render(new assign_quickgrading_result($message, $this->get_course_module()->id));
1973         $o .= $this->view_footer();
1974         return $o;
1975     }
1976
1977     /**
1978      * Display the page footer
1979      *
1980      * @return string
1981      */
1982     private function view_footer() {
1983         return $this->get_renderer()->render_footer();
1984     }
1985
1986     /**
1987      * Does this user have grade permission for this assignment
1988      *
1989      * @return bool
1990      */
1991     private function can_grade() {
1992         // Permissions check
1993         if (!has_capability('mod/assign:grade', $this->context)) {
1994             return false;
1995         }
1996
1997         return true;
1998     }
1999
2000     /**
2001      * Download a zip file of all assignment submissions
2002      *
2003      * @return void
2004      */
2005     private function download_submissions() {
2006         global $CFG,$DB;
2007
2008         // More efficient to load this here.
2009         require_once($CFG->libdir.'/filelib.php');
2010
2011         // Load all users with submit.
2012         $students = get_enrolled_users($this->context, "mod/assign:submit");
2013
2014         // Build a list of files to zip.
2015         $filesforzipping = array();
2016         $fs = get_file_storage();
2017
2018         $groupmode = groups_get_activity_groupmode($this->get_course_module());
2019         // All users.
2020         $groupid = 0;
2021         $groupname = '';
2022         if ($groupmode) {
2023             $groupid = groups_get_activity_group($this->get_course_module(), true);
2024             $groupname = groups_get_group_name($groupid).'-';
2025         }
2026
2027         // Construct the zip file name.
2028         $filename = clean_filename($this->get_course()->shortname.'-'.
2029                                    $this->get_instance()->name.'-'.
2030                                    $groupname.$this->get_course_module()->id.".zip");
2031
2032         // Get all the files for each student.
2033         foreach ($students as $student) {
2034             $userid = $student->id;
2035
2036             if ((groups_is_member($groupid, $userid) or !$groupmode or !$groupid)) {
2037                 // Get the plugins to add their own files to the zip.
2038
2039                 $submissiongroup = false;
2040                 $groupname = '';
2041                 if ($this->get_instance()->teamsubmission) {
2042                     $submission = $this->get_group_submission($userid, 0, false);
2043                     $submissiongroup = $this->get_submission_group($userid);
2044                     if ($submissiongroup) {
2045                         $groupname = $submissiongroup->name . '-';
2046                     } else {
2047                         $groupname = get_string('defaultteam', 'assign') . '-';
2048                     }
2049                 } else {
2050                     $submission = $this->get_user_submission($userid, false);
2051                 }
2052
2053                 if ($this->is_blind_marking()) {
2054                     $prefix = clean_filename(str_replace('_', ' ', $groupname . get_string('participant', 'assign')) .
2055                                              "_" . $this->get_uniqueid_for_user($userid) . "_");
2056                 } else {
2057                     $prefix = clean_filename(str_replace('_', ' ', $groupname . fullname($student)) .
2058                                              "_" . $this->get_uniqueid_for_user($userid) . "_");
2059                 }
2060
2061                 if ($submission) {
2062                     foreach ($this->submissionplugins as $plugin) {
2063                         if ($plugin->is_enabled() && $plugin->is_visible()) {
2064                             $pluginfiles = $plugin->get_files($submission, $student);
2065                             foreach ($pluginfiles as $zipfilename => $file) {
2066                                 $subtype = $plugin->get_subtype();
2067                                 $type = $plugin->get_type();
2068                                 $prefixedfilename = $prefix . $subtype . '_' . $type . '_' . $zipfilename;
2069                                 $filesforzipping[$prefixedfilename] = $file;
2070                             }
2071                         }
2072                     }
2073                 }
2074             }
2075         }
2076         if ($zipfile = $this->pack_files($filesforzipping)) {
2077             $this->add_to_log('download all submissions', get_string('downloadall', 'assign'));
2078             // Send file and delete after sending.
2079             send_temp_file($zipfile, $filename);
2080         }
2081     }
2082
2083     /**
2084      * Util function to add a message to the log
2085      *
2086      * @param string $action The current action
2087      * @param string $info A detailed description of the change. But no more than 255 characters.
2088      * @param string $url The url to the assign module instance.
2089      * @return void
2090      */
2091     public function add_to_log($action = '', $info = '', $url='') {
2092         global $USER;
2093
2094         $fullurl = 'view.php?id=' . $this->get_course_module()->id;
2095         if ($url != '') {
2096             $fullurl .= '&' . $url;
2097         }
2098
2099         add_to_log($this->get_course()->id, 'assign', $action, $fullurl, $info, $this->get_course_module()->id, $USER->id);
2100     }
2101
2102     /**
2103      * Lazy load the page renderer and expose the renderer to plugins
2104      *
2105      * @return assign_renderer
2106      */
2107     public function get_renderer() {
2108         global $PAGE;
2109         if ($this->output) {
2110             return $this->output;
2111         }
2112         $this->output = $PAGE->get_renderer('mod_assign');
2113         return $this->output;
2114     }
2115
2116     /**
2117      * Load the submission object for a particular user, optionally creating it if required
2118      *
2119      * For team assignments there are 2 submissions - the student submission and the team submission
2120      * All files are associated with the team submission but the status of the students contribution is
2121      * recorded separately.
2122      *
2123      * @param int $userid The id of the user whose submission we want or 0 in which case USER->id is used
2124      * @param bool $create optional Defaults to false. If set to true a new submission object will be created in the database
2125      * @return stdClass The submission
2126      */
2127     public function get_user_submission($userid, $create) {
2128         global $DB, $USER;
2129
2130         if (!$userid) {
2131             $userid = $USER->id;
2132         }
2133         // If the userid is not null then use userid.
2134         $params = array('assignment'=>$this->get_instance()->id, 'userid'=>$userid, 'groupid'=>0);
2135         $submission = $DB->get_record('assign_submission', $params);
2136
2137         if ($submission) {
2138             return $submission;
2139         }
2140         if ($create) {
2141             $submission = new stdClass();
2142             $submission->assignment   = $this->get_instance()->id;
2143             $submission->userid       = $userid;
2144             $submission->timecreated = time();
2145             $submission->timemodified = $submission->timecreated;
2146             $submission->status = ASSIGN_SUBMISSION_STATUS_DRAFT;
2147             $sid = $DB->insert_record('assign_submission', $submission);
2148             $submission->id = $sid;
2149             return $submission;
2150         }
2151         return false;
2152     }
2153
2154     /**
2155      * Load the submission object from it's id
2156      *
2157      * @param int $submissionid The id of the submission we want
2158      * @return stdClass The submission
2159      */
2160     private function get_submission($submissionid) {
2161         global $DB;
2162
2163         return $DB->get_record('assign_submission', array('assignment'=>$this->get_instance()->id, 'id'=>$submissionid), '*', MUST_EXIST);
2164     }
2165
2166     /**
2167      * This will retrieve a grade object from the db, optionally creating it if required
2168      *
2169      * @param int $userid The user we are grading
2170      * @param bool $create If true the grade will be created if it does not exist
2171      * @return stdClass The grade record
2172      */
2173     public function get_user_grade($userid, $create) {
2174         global $DB, $USER;
2175
2176         if (!$userid) {
2177             $userid = $USER->id;
2178         }
2179
2180         // if the userid is not null then use userid
2181         $grade = $DB->get_record('assign_grades', array('assignment'=>$this->get_instance()->id, 'userid'=>$userid));
2182
2183         if ($grade) {
2184             return $grade;
2185         }
2186         if ($create) {
2187             $grade = new stdClass();
2188             $grade->assignment   = $this->get_instance()->id;
2189             $grade->userid       = $userid;
2190             $grade->timecreated = time();
2191             $grade->timemodified = $grade->timecreated;
2192             $grade->locked = 0;
2193             $grade->grade = -1;
2194             $grade->grader = $USER->id;
2195             $grade->extensionduedate = 0;
2196             $gid = $DB->insert_record('assign_grades', $grade);
2197             $grade->id = $gid;
2198             return $grade;
2199         }
2200         return false;
2201     }
2202
2203     /**
2204      * This will retrieve a grade object from the db
2205      *
2206      * @param int $gradeid The id of the grade
2207      * @return stdClass The grade record
2208      */
2209     private function get_grade($gradeid) {
2210         global $DB;
2211
2212         return $DB->get_record('assign_grades', array('assignment'=>$this->get_instance()->id, 'id'=>$gradeid), '*', MUST_EXIST);
2213     }
2214
2215     /**
2216      * Print the grading page for a single user submission
2217      *
2218      * @param moodleform $mform
2219      * @param int $offset
2220      * @return string
2221      */
2222     private function view_single_grade_page($mform, $offset=0) {
2223         global $DB, $CFG;
2224
2225         $o = '';
2226
2227         // Include grade form
2228         require_once($CFG->dirroot . '/mod/assign/gradeform.php');
2229
2230         // Need submit permission to submit an assignment
2231         require_capability('mod/assign:grade', $this->context);
2232
2233         $o .= $this->get_renderer()->render(new assign_header($this->get_instance(),
2234                                                       $this->get_context(), false, $this->get_course_module()->id,get_string('grading', 'assign')));
2235
2236         $rownum = required_param('rownum', PARAM_INT) + $offset;
2237         $useridlist = optional_param('useridlist', '', PARAM_TEXT);
2238         if ($useridlist) {
2239             $useridlist = explode(',', $useridlist);
2240         } else {
2241             $useridlist = $this->get_grading_userid_list();
2242         }
2243         $last = false;
2244         $userid = $useridlist[$rownum];
2245         if ($rownum == count($useridlist) - 1) {
2246             $last = true;
2247         }
2248         if (!$userid) {
2249             throw new coding_exception('Row is out of bounds for the current grading table: ' . $rownum);
2250         }
2251         $user = $DB->get_record('user', array('id' => $userid));
2252         if ($user) {
2253             $o .= $this->get_renderer()->render(new assign_user_summary($user,
2254                                                                 $this->get_course()->id,
2255                                                                 has_capability('moodle/site:viewfullnames',
2256                                                                 $this->get_course_context()),
2257                                                                 $this->is_blind_marking(),
2258                                                                 $this->get_uniqueid_for_user($user->id)));
2259         }
2260         $submission = $this->get_user_submission($userid, false);
2261         $submissiongroup = null;
2262         $submissiongroupmemberswhohavenotsubmitted = array();
2263         $teamsubmission = null;
2264         $notsubmitted = array();
2265         if ($this->get_instance()->teamsubmission) {
2266             $teamsubmission = $this->get_group_submission($userid, 0, false);
2267             $submissiongroup = $this->get_submission_group($userid);
2268             $groupid = 0;
2269             if ($submissiongroup) {
2270                 $groupid = $submissiongroup->id;
2271             }
2272             $notsubmitted = $this->get_submission_group_members_who_have_not_submitted($groupid, false);
2273
2274         }
2275
2276         // get the current grade
2277         $grade = $this->get_user_grade($userid, false);
2278         if ($this->can_view_submission($userid)) {
2279             $gradelocked = ($grade && $grade->locked) || $this->grading_disabled($userid);
2280             $extensionduedate = null;
2281             if ($grade) {
2282                 $extensionduedate = $grade->extensionduedate;
2283             }
2284             $showedit = $this->submissions_open($userid) && ($this->is_any_submission_plugin_enabled());
2285
2286             if ($teamsubmission) {
2287                 $showsubmit = $showedit && $teamsubmission && ($teamsubmission->status == ASSIGN_SUBMISSION_STATUS_DRAFT);
2288             } else {
2289                 $showsubmit = $showedit && $submission && ($submission->status == ASSIGN_SUBMISSION_STATUS_DRAFT);
2290             }
2291             if (!$this->get_instance()->submissiondrafts) {
2292                 $showsubmit = false;
2293             }
2294             $viewfullnames = has_capability('moodle/site:viewfullnames', $this->get_course_context());
2295
2296             $o .= $this->get_renderer()->render(new assign_submission_status($this->get_instance()->allowsubmissionsfromdate,
2297                                                               $this->get_instance()->alwaysshowdescription,
2298                                                               $submission,
2299                                                               $this->get_instance()->teamsubmission,
2300                                                               $teamsubmission,
2301                                                               $submissiongroup,
2302                                                               $notsubmitted,
2303                                                               $this->is_any_submission_plugin_enabled(),
2304                                                               $gradelocked,
2305                                                               $this->is_graded($userid),
2306                                                               $this->get_instance()->duedate,
2307                                                               $this->get_instance()->cutoffdate,
2308                                                               $this->get_submission_plugins(),
2309                                                               $this->get_return_action(),
2310                                                               $this->get_return_params(),
2311                                                               $this->get_course_module()->id,
2312                                                               $this->get_course()->id,
2313                                                               assign_submission_status::GRADER_VIEW,
2314                                                               $showedit,
2315                                                               $showsubmit,
2316                                                               $viewfullnames,
2317                                                               $extensionduedate,
2318                                                               $this->get_context(),
2319                                                               $this->is_blind_marking(),
2320                                                               ''));
2321         }
2322         if ($grade) {
2323             $data = new stdClass();
2324             if ($grade->grade !== NULL && $grade->grade >= 0) {
2325                 $data->grade = format_float($grade->grade,2);
2326             }
2327         } else {
2328             $data = new stdClass();
2329             $data->grade = '';
2330         }
2331
2332         // now show the grading form
2333         if (!$mform) {
2334             $pagination = array( 'rownum'=>$rownum, 'useridlist'=>$useridlist, 'last'=>$last);
2335             $formparams = array($this, $data, $pagination);
2336             $mform = new mod_assign_grade_form(null,
2337                                                $formparams,
2338                                                'post',
2339                                                '',
2340                                                array('class'=>'gradeform'));
2341         }
2342         $o .= $this->get_renderer()->render(new assign_form('gradingform',$mform));
2343
2344         $msg = get_string('viewgradingformforstudent', 'assign', array('id'=>$user->id, 'fullname'=>fullname($user)));
2345         $this->add_to_log('view grading form', $msg);
2346
2347         $o .= $this->view_footer();
2348         return $o;
2349     }
2350
2351     /**
2352      * Show a confirmation page to make sure they want to release student identities
2353      *
2354      * @return string
2355      */
2356     private function view_reveal_identities_confirm() {
2357         global $CFG, $USER;
2358
2359         require_capability('mod/assign:revealidentities', $this->get_context());
2360
2361         $o = '';
2362         $o .= $this->get_renderer()->render(new assign_header($this->get_instance(),
2363                                                       $this->get_context(), false, $this->get_course_module()->id));
2364
2365         $confirmurl = new moodle_url('/mod/assign/view.php', array('id'=>$this->get_course_module()->id,
2366                                                                     'action'=>'revealidentitiesconfirm',
2367                                                                     'sesskey'=>sesskey()));
2368
2369         $cancelurl = new moodle_url('/mod/assign/view.php', array('id'=>$this->get_course_module()->id,
2370                                                                     'action'=>'grading'));
2371
2372         $o .= $this->get_renderer()->confirm(get_string('revealidentitiesconfirm', 'assign'), $confirmurl, $cancelurl);
2373         $o .= $this->view_footer();
2374         $this->add_to_log('view', get_string('viewrevealidentitiesconfirm', 'assign'));
2375         return $o;
2376     }
2377
2378
2379
2380
2381     /**
2382      * View a link to go back to the previous page. Uses url parameters returnaction and returnparams.
2383      *
2384      * @return string
2385      */
2386     private function view_return_links() {
2387
2388         $returnaction = optional_param('returnaction','', PARAM_ALPHA);
2389         $returnparams = optional_param('returnparams','', PARAM_TEXT);
2390
2391         $params = array();
2392         parse_str($returnparams, $params);
2393         $params = array_merge( array('id' => $this->get_course_module()->id, 'action' => $returnaction), $params);
2394
2395         return $this->get_renderer()->single_button(new moodle_url('/mod/assign/view.php', $params), get_string('back'), 'get');
2396
2397     }
2398
2399     /**
2400      * View the grading table of all submissions for this assignment
2401      *
2402      * @return string
2403      */
2404     private function view_grading_table() {
2405         global $USER, $CFG;
2406         // Include grading options form
2407         require_once($CFG->dirroot . '/mod/assign/gradingoptionsform.php');
2408         require_once($CFG->dirroot . '/mod/assign/quickgradingform.php');
2409         require_once($CFG->dirroot . '/mod/assign/gradingbatchoperationsform.php');
2410         $o = '';
2411
2412         $links = array();
2413         if (has_capability('gradereport/grader:view', $this->get_course_context()) &&
2414                 has_capability('moodle/grade:viewall', $this->get_course_context())) {
2415             $gradebookurl = '/grade/report/grader/index.php?id=' . $this->get_course()->id;
2416             $links[$gradebookurl] = get_string('viewgradebook', 'assign');
2417         }
2418         if ($this->is_any_submission_plugin_enabled()) {
2419             $downloadurl = '/mod/assign/view.php?id=' . $this->get_course_module()->id . '&action=downloadall';
2420             $links[$downloadurl] = get_string('downloadall', 'assign');
2421         }
2422         if ($this->is_blind_marking() && has_capability('mod/assign:revealidentities', $this->get_context())) {
2423             $revealidentitiesurl = '/mod/assign/view.php?id=' . $this->get_course_module()->id . '&action=revealidentities';
2424             $links[$revealidentitiesurl] = get_string('revealidentities', 'assign');
2425         }
2426         foreach ($this->get_feedback_plugins() as $plugin) {
2427             if ($plugin->is_enabled() && $plugin->is_visible()) {
2428                 foreach ($plugin->get_grading_actions() as $action => $description) {
2429                     $url = '/mod/assign/view.php' .
2430                            '?id=' .  $this->get_course_module()->id .
2431                            '&plugin=' . $plugin->get_type() .
2432                            '&pluginsubtype=assignfeedback' .
2433                            '&action=viewpluginpage&pluginaction=' . $action;
2434                     $links[$url] = $description;
2435                 }
2436             }
2437         }
2438
2439         $gradingactions = new url_select($links);
2440         $gradingactions->set_label(get_string('choosegradingaction', 'assign'));
2441
2442         $gradingmanager = get_grading_manager($this->get_context(), 'mod_assign', 'submissions');
2443
2444         $perpage = get_user_preferences('assign_perpage', 10);
2445         $filter = get_user_preferences('assign_filter', '');
2446         $controller = $gradingmanager->get_active_controller();
2447         $showquickgrading = empty($controller);
2448         if (optional_param('action', '', PARAM_ALPHA) == 'saveoptions') {
2449             $quickgrading = optional_param('quickgrading', false, PARAM_BOOL);
2450             set_user_preference('assign_quickgrading', $quickgrading);
2451         }
2452         $quickgrading = get_user_preferences('assign_quickgrading', false);
2453
2454         // print options  for changing the filter and changing the number of results per page
2455         $gradingoptionsform = new mod_assign_grading_options_form(null,
2456                                                                   array('cm'=>$this->get_course_module()->id,
2457                                                                         'contextid'=>$this->context->id,
2458                                                                         'userid'=>$USER->id,
2459                                                                         'submissionsenabled'=>$this->is_any_submission_plugin_enabled(),
2460                                                                         'showquickgrading'=>$showquickgrading,
2461                                                                         'quickgrading'=>$quickgrading),
2462                                                                   'post', '',
2463                                                                   array('class'=>'gradingoptionsform'));
2464
2465         $gradingbatchoperationsform = new mod_assign_grading_batch_operations_form(null,
2466                                                                   array('cm'=>$this->get_course_module()->id,
2467                                                                         'submissiondrafts'=>$this->get_instance()->submissiondrafts,
2468                                                                         'duedate'=>$this->get_instance()->duedate,
2469                                                                         'feedbackplugins'=>$this->get_feedback_plugins()),
2470                                                                   'post', '',
2471                                                                   array('class'=>'gradingbatchoperationsform'));
2472
2473         $gradingoptionsdata = new stdClass();
2474         $gradingoptionsdata->perpage = $perpage;
2475         $gradingoptionsdata->filter = $filter;
2476         $gradingoptionsform->set_data($gradingoptionsdata);
2477
2478         $actionformtext = $this->get_renderer()->render($gradingactions);
2479         $o .= $this->get_renderer()->render(new assign_header($this->get_instance(),
2480                                                       $this->get_context(), false, $this->get_course_module()->id, get_string('grading', 'assign'), $actionformtext));
2481         $o .= groups_print_activity_menu($this->get_course_module(), $CFG->wwwroot . '/mod/assign/view.php?id=' . $this->get_course_module()->id.'&action=grading', true);
2482
2483         // plagiarism update status apearring in the grading book
2484         if (!empty($CFG->enableplagiarism)) {
2485             /** Include plagiarismlib.php */
2486             require_once($CFG->libdir . '/plagiarismlib.php');
2487             $o .= plagiarism_update_status($this->get_course(), $this->get_course_module());
2488         }
2489
2490         // load and print the table of submissions
2491         if ($showquickgrading && $quickgrading) {
2492             $table = $this->get_renderer()->render(new assign_grading_table($this, $perpage, $filter, 0, true));
2493             $quickgradingform = new mod_assign_quick_grading_form(null,
2494                                                                   array('cm'=>$this->get_course_module()->id,
2495                                                                         'gradingtable'=>$table));
2496             $o .= $this->get_renderer()->render(new assign_form('quickgradingform', $quickgradingform));
2497         } else {
2498             $o .= $this->get_renderer()->render(new assign_grading_table($this, $perpage, $filter, 0, false));
2499         }
2500
2501         $currentgroup = groups_get_activity_group($this->get_course_module(), true);
2502         $users = array_keys($this->list_participants($currentgroup, true));
2503         if (count($users) != 0) {
2504             // if no enrolled user in a course then don't display the batch operations feature
2505             $o .= $this->get_renderer()->render(new assign_form('gradingbatchoperationsform', $gradingbatchoperationsform));
2506         }
2507         $o .= $this->get_renderer()->render(new assign_form('gradingoptionsform', $gradingoptionsform, 'M.mod_assign.init_grading_options'));
2508         return $o;
2509     }
2510
2511     /**
2512      * View entire grading page.
2513      *
2514      * @return string
2515      */
2516     private function view_grading_page() {
2517         global $CFG;
2518
2519         $o = '';
2520         // Need submit permission to submit an assignment
2521         require_capability('mod/assign:grade', $this->context);
2522         require_once($CFG->dirroot . '/mod/assign/gradeform.php');
2523
2524         // only load this if it is
2525
2526         $o .= $this->view_grading_table();
2527
2528         $o .= $this->view_footer();
2529         $this->add_to_log('view submission grading table', get_string('viewsubmissiongradingtable', 'assign'));
2530         return $o;
2531     }
2532
2533     /**
2534      * Capture the output of the plagiarism plugins disclosures and return it as a string
2535      *
2536      * @return void
2537      */
2538     private function plagiarism_print_disclosure() {
2539         global $CFG;
2540         $o = '';
2541
2542         if (!empty($CFG->enableplagiarism)) {
2543             /** Include plagiarismlib.php */
2544             require_once($CFG->libdir . '/plagiarismlib.php');
2545
2546             $o .= plagiarism_print_disclosure($this->get_course_module()->id);
2547         }
2548
2549         return $o;
2550     }
2551
2552     /**
2553      * message for students when assignment submissions have been closed
2554      *
2555      * @return string
2556      */
2557     private function view_student_error_message() {
2558         global $CFG;
2559
2560         $o = '';
2561         // Need submit permission to submit an assignment
2562         require_capability('mod/assign:submit', $this->context);
2563
2564         $o .= $this->get_renderer()->render(new assign_header($this->get_instance(),
2565                                                       $this->get_context(),
2566                                                       $this->show_intro(),
2567                                                       $this->get_course_module()->id,
2568                                                       get_string('editsubmission', 'assign')));
2569
2570         $o .= $this->get_renderer()->notification(get_string('submissionsclosed', 'assign'));
2571
2572         $o .= $this->view_footer();
2573
2574         return $o;
2575
2576     }
2577
2578     /**
2579      * View edit submissions page.
2580      *
2581      * @param moodleform $mform
2582      * @param array $notices A list of notices to display at the top of the edit submission form (e.g. from plugins).
2583      * @return void
2584      */
2585     private function view_edit_submission_page($mform, $notices) {
2586         global $CFG;
2587
2588         $o = '';
2589         // Include submission form
2590         require_once($CFG->dirroot . '/mod/assign/submission_form.php');
2591         // Need submit permission to submit an assignment
2592         require_capability('mod/assign:submit', $this->context);
2593
2594         if (!$this->submissions_open()) {
2595             return $this->view_student_error_message();
2596         }
2597         $o .= $this->get_renderer()->render(new assign_header($this->get_instance(),
2598                                                       $this->get_context(),
2599                                                       $this->show_intro(),
2600                                                       $this->get_course_module()->id,
2601                                                       get_string('editsubmission', 'assign')));
2602         $o .= $this->plagiarism_print_disclosure();
2603         $data = new stdClass();
2604
2605         if (!$mform) {
2606             $mform = new mod_assign_submission_form(null, array($this, $data));
2607         }
2608
2609         foreach ($notices as $notice) {
2610             $o .= $this->get_renderer()->notification($notice);
2611         }
2612
2613         $o .= $this->get_renderer()->render(new assign_form('editsubmissionform',$mform));
2614
2615         $o .= $this->view_footer();
2616         $this->add_to_log('view submit assignment form', get_string('viewownsubmissionform', 'assign'));
2617
2618         return $o;
2619     }
2620
2621     /**
2622      * See if this assignment has a grade yet
2623      *
2624      * @param int $userid
2625      * @return bool
2626      */
2627     private function is_graded($userid) {
2628         $grade = $this->get_user_grade($userid, false);
2629         if ($grade) {
2630             return ($grade->grade !== NULL && $grade->grade >= 0);
2631         }
2632         return false;
2633     }
2634
2635
2636     /**
2637      * Perform an access check to see if the current $USER can view this users submission
2638      *
2639      * @param int $userid
2640      * @return bool
2641      */
2642     public function can_view_submission($userid) {
2643         global $USER;
2644
2645         if (!is_enrolled($this->get_course_context(), $userid)) {
2646             return false;
2647         }
2648         if ($userid == $USER->id && !has_capability('mod/assign:submit', $this->context)) {
2649             return false;
2650         }
2651         if ($userid != $USER->id && !has_capability('mod/assign:grade', $this->context)) {
2652             return false;
2653         }
2654         return true;
2655     }
2656
2657     /**
2658      * Allows the plugin to show a batch grading operation page.
2659      *
2660      * @return none
2661      */
2662     private function view_plugin_grading_batch_operation($mform) {
2663         require_capability('mod/assign:grade', $this->context);
2664         $prefix = 'plugingradingbatchoperation_';
2665
2666         if ($data = $mform->get_data()) {
2667             $tail = substr($data->operation, strlen($prefix));
2668             list($plugintype, $action) = explode('_', $tail, 2);
2669
2670             $plugin = $this->get_feedback_plugin_by_type($plugintype);
2671             if ($plugin) {
2672                 $users = $data->selectedusers;
2673                 $userlist = explode(',', $users);
2674                 echo $plugin->grading_batch_operation($action, $userlist);
2675                 return;
2676             }
2677         }
2678         print_error('invalidformdata', '');
2679     }
2680
2681     /**
2682      * Ask the user to confirm they want to perform this batch operation
2683      * @param moodleform $mform Set to a grading batch operations form
2684      * @return string - the page to view after processing these actions
2685      */
2686     private function process_grading_batch_operation(& $mform) {
2687         global $CFG;
2688         require_once($CFG->dirroot . '/mod/assign/gradingbatchoperationsform.php');
2689         require_sesskey();
2690
2691         $mform = new mod_assign_grading_batch_operations_form(null,
2692                                                               array('cm'=>$this->get_course_module()->id,
2693                                                                     'submissiondrafts'=>$this->get_instance()->submissiondrafts,
2694                                                                     'duedate'=>$this->get_instance()->duedate,
2695                                                                     'feedbackplugins'=>$this->get_feedback_plugins()),
2696                                                               'post',
2697                                                               '',
2698                                                               array('class'=>'gradingbatchoperationsform'));
2699
2700         if ($data = $mform->get_data()) {
2701             // get the list of users
2702             $users = $data->selectedusers;
2703             $userlist = explode(',', $users);
2704
2705             $prefix = 'plugingradingbatchoperation_';
2706
2707             if ($data->operation == 'grantextension') {
2708                 // Reset the form so the grant extension page will create the extension form.
2709                 $mform = null;
2710                 return 'grantextension';
2711             } else if (strpos($data->operation, $prefix) === 0) {
2712                 $tail = substr($data->operation, strlen($prefix));
2713                 list($plugintype, $action) = explode('_', $tail, 2);
2714
2715                 $plugin = $this->get_feedback_plugin_by_type($plugintype);
2716                 if ($plugin) {
2717                     return 'plugingradingbatchoperation';
2718                 }
2719             }
2720
2721             foreach ($userlist as $userid) {
2722                 if ($data->operation == 'lock') {
2723                     $this->process_lock($userid);
2724                 } else if ($data->operation == 'unlock') {
2725                     $this->process_unlock($userid);
2726                 } else if ($data->operation == 'reverttodraft') {
2727                     $this->process_revert_to_draft($userid);
2728                 }
2729             }
2730         }
2731
2732         return 'grading';
2733     }
2734
2735     /**
2736      * Ask the user to confirm they want to submit their work for grading
2737      * @param $mform moodleform - null unless form validation has failed
2738      * @return string
2739      */
2740     private function check_submit_for_grading($mform) {
2741         global $USER, $CFG;
2742
2743         require_once($CFG->dirroot . '/mod/assign/submissionconfirmform.php');
2744
2745         // Check that all of the submission plugins are ready for this submission
2746         $notifications = array();
2747         $submission = $this->get_user_submission($USER->id, false);
2748         $plugins = $this->get_submission_plugins();
2749         foreach ($plugins as $plugin) {
2750             if ($plugin->is_enabled() && $plugin->is_visible()) {
2751                 $check = $plugin->precheck_submission($submission);
2752                 if ($check !== true) {
2753                     $notifications[] = $check;
2754                 }
2755             }
2756         }
2757
2758         $data = new stdClass();
2759         $adminconfig = $this->get_admin_config();
2760         $requiresubmissionstatement = (!empty($adminconfig->requiresubmissionstatement) ||
2761                                        $this->get_instance()->requiresubmissionstatement) &&
2762                                        !empty($adminconfig->submissionstatement);
2763
2764         $submissionstatement = '';
2765         if (!empty($adminconfig->submissionstatement)) {
2766             $submissionstatement = $adminconfig->submissionstatement;
2767         }
2768
2769         if ($mform == null) {
2770             $mform = new mod_assign_confirm_submission_form(null, array($requiresubmissionstatement,
2771                                                                         $submissionstatement,
2772                                                                         $this->get_course_module()->id,
2773                                                                         $data));
2774         }
2775         $o = '';
2776         $o .= $this->get_renderer()->header();
2777         $o .= $this->get_renderer()->render(new assign_submit_for_grading_page($notifications, $this->get_course_module()->id, $mform));
2778         $o .= $this->view_footer();
2779
2780         $this->add_to_log('view confirm submit assignment form', get_string('viewownsubmissionform', 'assign'));
2781
2782         return $o;
2783     }
2784
2785     /**
2786      * Print 2 tables of information with no action links -
2787      * the submission summary and the grading summary
2788      *
2789      * @param stdClass $user the user to print the report for
2790      * @param bool $showlinks - Return plain text or links to the profile
2791      * @return string - the html summary
2792      */
2793     public function view_student_summary($user, $showlinks) {
2794         global $CFG, $DB, $PAGE;
2795
2796         $grade = $this->get_user_grade($user->id, false);
2797         $submission = $this->get_user_submission($user->id, false);
2798         $o = '';
2799
2800         $teamsubmission = null;
2801         $submissiongroup = null;
2802         $notsubmitted = array();
2803         if ($this->get_instance()->teamsubmission) {
2804             $teamsubmission = $this->get_group_submission($user->id, 0, false);
2805             $submissiongroup = $this->get_submission_group($user->id);
2806             $groupid = 0;
2807             if ($submissiongroup) {
2808                 $groupid = $submissiongroup->id;
2809             }
2810             $notsubmitted = $this->get_submission_group_members_who_have_not_submitted($groupid, false);
2811         }
2812
2813         if ($this->can_view_submission($user->id)) {
2814             $showedit = has_capability('mod/assign:submit', $this->context) &&
2815                          $this->submissions_open($user->id) && ($this->is_any_submission_plugin_enabled()) && $showlinks;
2816             $gradelocked = ($grade && $grade->locked) || $this->grading_disabled($user->id);
2817             // Grading criteria preview.
2818             $gradingmanager = get_grading_manager($this->context, 'mod_assign', 'submissions');
2819             $gradingcontrollerpreview = '';
2820             if ($gradingmethod = $gradingmanager->get_active_method()) {
2821                 $controller = $gradingmanager->get_controller($gradingmethod);
2822                 if ($controller->is_form_defined()) {
2823                     $gradingcontrollerpreview = $controller->render_preview($PAGE);
2824                 }
2825             }
2826
2827             $showsubmit = ($submission || $teamsubmission) && $showlinks;
2828             if ($teamsubmission && ($teamsubmission->status == ASSIGN_SUBMISSION_STATUS_SUBMITTED)) {
2829                 $showsubmit = false;
2830             }
2831             if ($submission && ($submission->status == ASSIGN_SUBMISSION_STATUS_SUBMITTED)) {
2832                 $showsubmit = false;
2833             }
2834             if (!$this->get_instance()->submissiondrafts) {
2835                 $showsubmit = false;
2836             }
2837             $extensionduedate = null;
2838             if ($grade) {
2839                 $extensionduedate = $grade->extensionduedate;
2840             }
2841             $viewfullnames = has_capability('moodle/site:viewfullnames', $this->get_course_context());
2842             $o .= $this->get_renderer()->render(new assign_submission_status($this->get_instance()->allowsubmissionsfromdate,
2843                                                               $this->get_instance()->alwaysshowdescription,
2844                                                               $submission,
2845                                                               $this->get_instance()->teamsubmission,
2846                                                               $teamsubmission,
2847                                                               $submissiongroup,
2848                                                               $notsubmitted,
2849                                                               $this->is_any_submission_plugin_enabled(),
2850                                                               $gradelocked,
2851                                                               $this->is_graded($user->id),
2852                                                               $this->get_instance()->duedate,
2853                                                               $this->get_instance()->cutoffdate,
2854                                                               $this->get_submission_plugins(),
2855                                                               $this->get_return_action(),
2856                                                               $this->get_return_params(),
2857                                                               $this->get_course_module()->id,
2858                                                               $this->get_course()->id,
2859                                                               assign_submission_status::STUDENT_VIEW,
2860                                                               $showedit,
2861                                                               $showsubmit,
2862                                                               $viewfullnames,
2863                                                               $extensionduedate,
2864                                                               $this->get_context(),
2865                                                               $this->is_blind_marking(),
2866                                                               $gradingcontrollerpreview));
2867
2868             require_once($CFG->libdir.'/gradelib.php');
2869             require_once($CFG->dirroot.'/grade/grading/lib.php');
2870
2871             $gradinginfo = grade_get_grades($this->get_course()->id,
2872                                         'mod',
2873                                         'assign',
2874                                         $this->get_instance()->id,
2875                                         $user->id);
2876
2877             $gradingitem = $gradinginfo->items[0];
2878             $gradebookgrade = $gradingitem->grades[$user->id];
2879
2880             // check to see if all feedback plugins are empty
2881             $emptyplugins = true;
2882             if ($grade) {
2883                 foreach ($this->get_feedback_plugins() as $plugin) {
2884                     if ($plugin->is_visible() && $plugin->is_enabled()) {
2885                         if (!$plugin->is_empty($grade)) {
2886                             $emptyplugins = false;
2887                         }
2888                     }
2889                 }
2890             }
2891
2892
2893             if (!($gradebookgrade->hidden) && ($gradebookgrade->grade !== null || !$emptyplugins)) {
2894
2895                 $gradefordisplay = '';
2896                 $gradingmanager = get_grading_manager($this->get_context(), 'mod_assign', 'submissions');
2897
2898                 if ($controller = $gradingmanager->get_active_controller()) {
2899                     $controller->set_grade_range(make_grades_menu($this->get_instance()->grade));
2900                     $gradefordisplay = $controller->render_grade($PAGE,
2901                                                                  $grade->id,
2902                                                                  $gradingitem,
2903                                                                  $gradebookgrade->str_long_grade,
2904                                                                  has_capability('mod/assign:grade', $this->get_context()));
2905                 } else {
2906                     $gradefordisplay = $this->display_grade($gradebookgrade->grade, false);
2907                 }
2908
2909                 $gradeddate = $gradebookgrade->dategraded;
2910                 $grader = $DB->get_record('user', array('id'=>$gradebookgrade->usermodified));
2911
2912                 $feedbackstatus = new assign_feedback_status($gradefordisplay,
2913                                                       $gradeddate,
2914                                                       $grader,
2915                                                       $this->get_feedback_plugins(),
2916                                                       $grade,
2917                                                       $this->get_course_module()->id,
2918                                                       $this->get_return_action(),
2919                                                       $this->get_return_params());
2920
2921                 $o .= $this->get_renderer()->render($feedbackstatus);
2922             }
2923
2924         }
2925         return $o;
2926     }
2927
2928     /**
2929      * View submissions page (contains details of current submission).
2930      *
2931      * @return string
2932      */
2933     private function view_submission_page() {
2934         global $CFG, $DB, $USER, $PAGE;
2935
2936         $o = '';
2937         $o .= $this->get_renderer()->render(new assign_header($this->get_instance(),
2938                                                       $this->get_context(),
2939                                                       $this->show_intro(),
2940                                                       $this->get_course_module()->id));
2941
2942         if ($this->can_grade()) {
2943             if ($this->get_instance()->teamsubmission) {
2944                 $summary = new assign_grading_summary($this->count_teams(),
2945                                                       $this->get_instance()->submissiondrafts,
2946                                                       $this->count_submissions_with_status(ASSIGN_SUBMISSION_STATUS_DRAFT),
2947                                                       $this->is_any_submission_plugin_enabled(),
2948                                                       $this->count_submissions_with_status(ASSIGN_SUBMISSION_STATUS_SUBMITTED),
2949                                                       $this->get_instance()->cutoffdate,
2950                                                       $this->get_instance()->duedate,
2951                                                       $this->get_course_module()->id,
2952                                                       $this->count_submissions_need_grading(),
2953                                                       $this->get_instance()->teamsubmission);
2954                 $o .= $this->get_renderer()->render($summary);
2955             } else {
2956                 $summary = new assign_grading_summary($this->count_participants(0),
2957                                                       $this->get_instance()->submissiondrafts,
2958                                                       $this->count_submissions_with_status(ASSIGN_SUBMISSION_STATUS_DRAFT),
2959                                                       $this->is_any_submission_plugin_enabled(),
2960                                                       $this->count_submissions_with_status(ASSIGN_SUBMISSION_STATUS_SUBMITTED),
2961                                                       $this->get_instance()->cutoffdate,
2962                                                       $this->get_instance()->duedate,
2963                                                       $this->get_course_module()->id,
2964                                                       $this->count_submissions_need_grading(),
2965                                                       $this->get_instance()->teamsubmission);
2966                 $o .= $this->get_renderer()->render($summary);
2967             }
2968         }
2969         $grade = $this->get_user_grade($USER->id, false);
2970         $submission = $this->get_user_submission($USER->id, false);
2971
2972         if ($this->can_view_submission($USER->id)) {
2973             $o .= $this->view_student_summary($USER, true);
2974         }
2975
2976
2977         $o .= $this->view_footer();
2978         $this->add_to_log('view', get_string('viewownsubmissionstatus', 'assign'));
2979         return $o;
2980     }
2981
2982     /**
2983      * convert the final raw grade(s) in the  grading table for the gradebook
2984      *
2985      * @param stdClass $grade
2986      * @return array
2987      */
2988     private function convert_grade_for_gradebook(stdClass $grade) {
2989         $gradebookgrade = array();
2990         // trying to match those array keys in grade update function in gradelib.php
2991         // with keys in th database table assign_grades
2992         // starting around line 262
2993         if ($grade->grade >= 0) {
2994             $gradebookgrade['rawgrade'] = $grade->grade;
2995         }
2996         $gradebookgrade['userid'] = $grade->userid;
2997         $gradebookgrade['usermodified'] = $grade->grader;
2998         $gradebookgrade['datesubmitted'] = NULL;
2999         $gradebookgrade['dategraded'] = $grade->timemodified;
3000         if (isset($grade->feedbackformat)) {
3001             $gradebookgrade['feedbackformat'] = $grade->feedbackformat;
3002         }
3003         if (isset($grade->feedbacktext)) {
3004             $gradebookgrade['feedback'] = $grade->feedbacktext;
3005         }
3006
3007         return $gradebookgrade;
3008     }
3009
3010     /**
3011      * convert submission details for the gradebook
3012      *
3013      * @param stdClass $submission
3014      * @return array
3015      */
3016     private function convert_submission_for_gradebook(stdClass $submission) {
3017         $gradebookgrade = array();
3018
3019
3020         $gradebookgrade['userid'] = $submission->userid;
3021         $gradebookgrade['usermodified'] = $submission->userid;
3022         $gradebookgrade['datesubmitted'] = $submission->timemodified;
3023
3024         return $gradebookgrade;
3025     }
3026
3027     /**
3028      * update grades in the gradebook
3029      *
3030      * @param mixed $submission stdClass|null
3031      * @param mixed $grade stdClass|null
3032      * @return bool
3033      */
3034     private function gradebook_item_update($submission=NULL, $grade=NULL) {
3035
3036         // Do not push grade to gradebook if blind marking is active as the gradebook would reveal the students.
3037         if ($this->is_blind_marking()) {
3038             return false;
3039         }
3040         if ($submission != NULL) {
3041             if ($submission->userid == 0) {
3042                 // This is a group submission update.
3043                 $team = groups_get_members($submission->groupid, 'u.id');
3044
3045                 foreach ($team as $member) {
3046                     $submission->groupid = 0;
3047                     $submission->userid = $member->id;
3048                     $this->gradebook_item_update($submission, null);
3049                 }
3050                 return;
3051             }
3052
3053             $gradebookgrade = $this->convert_submission_for_gradebook($submission);
3054
3055         } else {
3056             $gradebookgrade = $this->convert_grade_for_gradebook($grade);
3057         }
3058         // Grading is disabled, return.
3059         if ($this->grading_disabled($gradebookgrade['userid'])) {
3060             return false;
3061         }
3062         $assign = clone $this->get_instance();
3063         $assign->cmidnumber = $this->get_course_module()->id;
3064
3065         return assign_grade_item_update($assign, $gradebookgrade);
3066     }
3067
3068     /**
3069      * update team submission
3070      *
3071      * @param stdClass $submission
3072      * @param int $userid
3073      * @param bool $updatetime
3074      * @return bool
3075      */
3076     private function update_team_submission(stdClass $submission, $userid, $updatetime) {
3077         global $DB;
3078
3079         if ($updatetime) {
3080             $submission->timemodified = time();
3081         }
3082
3083         // First update the submission for the current user.
3084         $mysubmission = $this->get_user_submission($userid, true);
3085         $mysubmission->status = $submission->status;
3086
3087         $this->update_submission($mysubmission, 0, $updatetime, false);
3088
3089         // Now check the team settings to see if this assignment qualifies as submitted or draft.
3090         $team = $this->get_submission_group_members($submission->groupid, true);
3091
3092         $allsubmitted = true;
3093         $anysubmitted = false;
3094         foreach ($team as $member) {
3095             $membersubmission = $this->get_user_submission($member->id, false);
3096
3097             if (!$membersubmission || $membersubmission->status != ASSIGN_SUBMISSION_STATUS_SUBMITTED) {
3098                 $allsubmitted = false;
3099                 if ($anysubmitted) {
3100                     break;
3101                 }
3102             } else {
3103                 $anysubmitted = true;
3104             }
3105         }
3106         if ($this->get_instance()->requireallteammemberssubmit) {
3107             if ($allsubmitted) {
3108                 $submission->status = ASSIGN_SUBMISSION_STATUS_SUBMITTED;
3109             } else {
3110                 $submission->status = ASSIGN_SUBMISSION_STATUS_DRAFT;
3111             }
3112             $result= $DB->update_record('assign_submission', $submission);
3113         } else {
3114             if ($anysubmitted) {
3115                 $submission->status = ASSIGN_SUBMISSION_STATUS_SUBMITTED;
3116             } else {
3117                 $submission->status = ASSIGN_SUBMISSION_STATUS_DRAFT;
3118             }
3119             $result= $DB->update_record('assign_submission', $submission);
3120         }
3121
3122         $this->gradebook_item_update($submission);
3123         return $result;
3124     }
3125
3126
3127     /**
3128      * update grades in the gradebook based on submission time
3129      *
3130      * @param stdClass $submission
3131      * @param int $userid
3132      * @param bool $updatetime
3133      * @param bool $teamsubmission
3134      * @return bool
3135      */
3136     private function update_submission(stdClass $submission, $userid, $updatetime, $teamsubmission) {
3137         global $DB;
3138
3139         if ($teamsubmission) {
3140             return $this->update_team_submission($submission, $userid, $updatetime);
3141         }
3142
3143         if ($updatetime) {
3144             $submission->timemodified = time();
3145         }
3146         $result= $DB->update_record('assign_submission', $submission);
3147         if ($result) {
3148             $this->gradebook_item_update($submission);
3149         }
3150         return $result;
3151     }
3152
3153     /**
3154      * Is this assignment open for submissions?
3155      *
3156      * Check the due date,
3157      * prevent late submissions,
3158      * has this person already submitted,
3159      * is the assignment locked?
3160      *
3161      * @param int $userid - Optional userid so we can see if a different user can submit
3162      * @return bool
3163      */
3164     public function submissions_open($userid = 0) {
3165         global $USER;
3166
3167         if (!$userid) {
3168             $userid = $USER->id;
3169         }
3170
3171         $time = time();
3172         $dateopen = true;
3173         $finaldate = false;
3174         if ($this->get_instance()->cutoffdate) {
3175             $finaldate = $this->get_instance()->cutoffdate;
3176         }
3177         // User extensions.
3178         if ($finaldate) {
3179             $grade = $this->get_user_grade($userid, false);
3180             if ($grade && $grade->extensionduedate) {
3181                 // Extension can be before cut off date.
3182                 if ($grade->extensionduedate > $finaldate) {
3183                     $finaldate = $grade->extensionduedate;
3184                 }
3185             }
3186         }
3187
3188         if ($finaldate) {
3189             $dateopen = ($this->get_instance()->allowsubmissionsfromdate <= $time && $time <= $finaldate);
3190         } else {
3191             $dateopen = ($this->get_instance()->allowsubmissionsfromdate <= $time);
3192         }
3193
3194         if (!$dateopen) {
3195             return false;
3196         }
3197
3198         // Now check if this user has already submitted etc.
3199         if (!is_enrolled($this->get_course_context(), $userid)) {
3200             return false;
3201         }
3202         $submission = false;
3203         if ($this->get_instance()->teamsubmission) {
3204             $submission = $this->get_group_submission($userid, 0, false);
3205         } else {
3206             $submission = $this->get_user_submission($userid, false);
3207         }
3208         if ($submission) {
3209
3210             if ($this->get_instance()->submissiondrafts && $submission->status == ASSIGN_SUBMISSION_STATUS_SUBMITTED) {
3211                 // drafts are tracked and the student has submitted the assignment
3212                 return false;
3213             }
3214         }
3215         if ($grade = $this->get_user_grade($userid, false)) {
3216             if ($grade->locked) {
3217                 return false;
3218             }
3219         }
3220
3221         if ($this->grading_disabled($userid)) {
3222             return false;
3223         }
3224
3225         return true;
3226     }
3227
3228     /**
3229      * render the files in file area
3230      * @param string $component
3231      * @param string $area
3232      * @param int $submissionid
3233      * @return string
3234      */
3235     public function render_area_files($component, $area, $submissionid) {
3236         global $USER;
3237
3238         $fs = get_file_storage();
3239         $browser = get_file_browser();
3240         $files = $fs->get_area_files($this->get_context()->id, $component, $area , $submissionid , "timemodified", false);
3241         return $this->get_renderer()->assign_files($this->context, $submissionid, $area, $component);
3242
3243     }
3244
3245     /**
3246      * Returns a list of teachers that should be grading given submission
3247      *
3248      * @param int $userid
3249      * @return array
3250      */
3251     private function get_graders($userid) {
3252         //potential graders
3253         $potentialgraders = get_enrolled_users($this->context, "mod/assign:grade");
3254
3255         $graders = array();
3256         if (groups_get_activity_groupmode($this->get_course_module()) == SEPARATEGROUPS) {   // Separate groups are being used
3257             if ($groups = groups_get_all_groups($this->get_course()->id, $userid)) {  // Try to find all groups
3258                 foreach ($groups as $group) {
3259                     foreach ($potentialgraders as $grader) {
3260                         if ($grader->id == $userid) {
3261                             continue; // do not send self
3262                         }
3263                         if (groups_is_member($group->id, $grader->id)) {
3264                             $graders[$grader->id] = $grader;
3265                         }
3266                     }
3267                 }
3268             } else {
3269                 // user not in group, try to find graders without group
3270                 foreach ($potentialgraders as $grader) {
3271                     if ($grader->id == $userid) {