mod/assignment/lib.php

   1 <?PHP
   2
   3 // This file is part of Moodle - http://moodle.org/
   4 //
   5 // Moodle is free software: you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation, either version 3 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // Moodle is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 /**
  19  * assignment_base is the base class for assignment types
  20  *
  21  * This class provides all the functionality for an assignment
  22  *
  23  * @package   mod-assignment
  24  * @copyright 1999 onwards Martin Dougiamas  {@link http://moodle.com}
  25  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  26  */
  27
  28 /** Include eventslib.php */
  29 require_once($CFG->libdir.'/eventslib.php');
  30 /** Include formslib.php */
  31 require_once($CFG->libdir.'/formslib.php');
  32 /** Include calendar/lib.php */
  33 require_once($CFG->dirroot.'/calendar/lib.php');
  34
  35 /** ASSIGNMENT_COUNT_WORDS = 1 */
  36 define('ASSIGNMENT_COUNT_WORDS', 1);
  37 /** ASSIGNMENT_COUNT_LETTERS = 2 */
  38 define('ASSIGNMENT_COUNT_LETTERS', 2);
  39
  40 /**
  41  * Standard base class for all assignment submodules (assignment types).
  42  *
  43  * @package   mod-assignment
  44  * @copyright 1999 onwards Martin Dougiamas  {@link http://moodle.com}
  45  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  46  */
  47 class assignment_base {
  48
  49     const FILTER_ALL             = 0;
  50     const FILTER_SUBMITTED       = 1;
  51     const FILTER_REQUIRE_GRADING = 2;
  52
  53     /** @var object */
  54     var $cm;
  55     /** @var object */
  56     var $course;
  57     /** @var object */
  58     var $assignment;
  59     /** @var string */
  60     var $strassignment;
  61     /** @var string */
  62     var $strassignments;
  63     /** @var string */
  64     var $strsubmissions;
  65     /** @var string */
  66     var $strlastmodified;
  67     /** @var string */
  68     var $pagetitle;
  69     /** @var bool */
  70     var $usehtmleditor;
  71     /**
  72      * @todo document this var
  73      */
  74     var $defaultformat;
  75     /**
  76      * @todo document this var
  77      */
  78     var $context;
  79     /** @var string */
  80     var $type;
  81
  82     /**
  83      * Constructor for the base assignment class
  84      *
  85      * Constructor for the base assignment class.
  86      * If cmid is set create the cm, course, assignment objects.
  87      * If the assignment is hidden and the user is not a teacher then
  88      * this prints a page header and notice.
  89      *
  90      * @global object
  91      * @global object
  92      * @param int $cmid the current course module id - not set for new assignments
  93      * @param object $assignment usually null, but if we have it we pass it to save db access
  94      * @param object $cm usually null, but if we have it we pass it to save db access
  95      * @param object $course usually null, but if we have it we pass it to save db access
  96      */
  97     function assignment_base($cmid='staticonly', $assignment=NULL, $cm=NULL, $course=NULL) {
  98         global $COURSE, $DB;
  99
 100         if ($cmid == 'staticonly') {
 101             //use static functions only!
 102             return;
 103         }
 104
 105         global $CFG;
 106
 107         if ($cm) {
 108             $this->cm = $cm;
 109         } else if (! $this->cm = get_coursemodule_from_id('assignment', $cmid)) {
 110             print_error('invalidcoursemodule');
 111         }
 112
 113         $this->context = get_context_instance(CONTEXT_MODULE, $this->cm->id);
 114
 115         if ($course) {
 116             $this->course = $course;
 117         } else if ($this->cm->course == $COURSE->id) {
 118             $this->course = $COURSE;
 119         } else if (! $this->course = $DB->get_record('course', array('id'=>$this->cm->course))) {
 120             print_error('invalidid', 'assignment');
 121         }
 122
 123         if ($assignment) {
 124             $this->assignment = $assignment;
 125         } else if (! $this->assignment = $DB->get_record('assignment', array('id'=>$this->cm->instance))) {
 126             print_error('invalidid', 'assignment');
 127         }
 128
 129         $this->assignment->cmidnumber = $this->cm->idnumber; // compatibility with modedit assignment obj
 130         $this->assignment->courseid   = $this->course->id; // compatibility with modedit assignment obj
 131
 132         $this->strassignment = get_string('modulename', 'assignment');
 133         $this->strassignments = get_string('modulenameplural', 'assignment');
 134         $this->strsubmissions = get_string('submissions', 'assignment');
 135         $this->strlastmodified = get_string('lastmodified');
 136         $this->pagetitle = strip_tags($this->course->shortname.': '.$this->strassignment.': '.format_string($this->assignment->name,true));
 137
 138         // visibility handled by require_login() with $cm parameter
 139         // get current group only when really needed
 140
 141     /// Set up things for a HTML editor if it's needed
 142         $this->defaultformat = editors_get_preferred_format();
 143     }
 144
 145     /**
 146      * Display the assignment, used by view.php
 147      *
 148      * This in turn calls the methods producing individual parts of the page
 149      */
 150     function view() {
 151
 152         $context = get_context_instance(CONTEXT_MODULE,$this->cm->id);
 153         require_capability('mod/assignment:view', $context);
 154
 155         add_to_log($this->course->id, "assignment", "view", "view.php?id={$this->cm->id}",
 156                    $this->assignment->id, $this->cm->id);
 157
 158         $this->view_header();
 159
 160         $this->view_intro();
 161
 162         $this->view_dates();
 163
 164         $this->view_feedback();
 165
 166         $this->view_footer();
 167     }
 168
 169     /**
 170      * Display the header and top of a page
 171      *
 172      * (this doesn't change much for assignment types)
 173      * This is used by the view() method to print the header of view.php but
 174      * it can be used on other pages in which case the string to denote the
 175      * page in the navigation trail should be passed as an argument
 176      *
 177      * @global object
 178      * @param string $subpage Description of subpage to be used in navigation trail
 179      */
 180     function view_header($subpage='') {
 181         global $CFG, $PAGE, $OUTPUT;
 182
 183         if ($subpage) {
 184             $PAGE->navbar->add($subpage);
 185         }
 186
 187         $PAGE->set_title($this->pagetitle);
 188         $PAGE->set_heading($this->course->fullname);
 189
 190         echo $OUTPUT->header();
 191
 192         groups_print_activity_menu($this->cm, $CFG->wwwroot . '/mod/assignment/view.php?id=' . $this->cm->id);
 193
 194         echo '<div class="reportlink">'.$this->submittedlink().'</div>';
 195         echo '<div class="clearer"></div>';
 196     }
 197
 198
 199     /**
 200      * Display the assignment intro
 201      *
 202      * This will most likely be extended by assignment type plug-ins
 203      * The default implementation prints the assignment description in a box
 204      */
 205     function view_intro() {
 206         global $OUTPUT;
 207         echo $OUTPUT->box_start('generalbox boxaligncenter', 'intro');
 208         echo format_module_intro('assignment', $this->assignment, $this->cm->id);
 209         echo $OUTPUT->box_end();
 210         plagiarism_print_disclosure($this->cm->id);
 211     }
 212
 213     /**
 214      * Display the assignment dates
 215      *
 216      * Prints the assignment start and end dates in a box.
 217      * This will be suitable for most assignment types
 218      */
 219     function view_dates() {
 220         global $OUTPUT;
 221         if (!$this->assignment->timeavailable && !$this->assignment->timedue) {
 222             return;
 223         }
 224
 225         echo $OUTPUT->box_start('generalbox boxaligncenter', 'dates');
 226         echo '<table>';
 227         if ($this->assignment->timeavailable) {
 228             echo '<tr><td class="c0">'.get_string('availabledate','assignment').':</td>';
 229             echo '    <td class="c1">'.userdate($this->assignment->timeavailable).'</td></tr>';
 230         }
 231         if ($this->assignment->timedue) {
 232             echo '<tr><td class="c0">'.get_string('duedate','assignment').':</td>';
 233             echo '    <td class="c1">'.userdate($this->assignment->timedue).'</td></tr>';
 234         }
 235         echo '</table>';
 236         echo $OUTPUT->box_end();
 237     }
 238
 239
 240     /**
 241      * Display the bottom and footer of a page
 242      *
 243      * This default method just prints the footer.
 244      * This will be suitable for most assignment types
 245      */
 246     function view_footer() {
 247         global $OUTPUT;
 248         echo $OUTPUT->footer();
 249     }
 250
 251     /**
 252      * Display the feedback to the student
 253      *
 254      * This default method prints the teacher picture and name, date when marked,
 255      * grade and teacher submissioncomment.
 256      *
 257      * @global object
 258      * @global object
 259      * @global object
 260      * @param object $submission The submission object or NULL in which case it will be loaded
 261      */
 262     function view_feedback($submission=NULL) {
 263         global $USER, $CFG, $DB, $OUTPUT;
 264         require_once($CFG->libdir.'/gradelib.php');
 265
 266         if (!is_enrolled($this->context, $USER, 'mod/assignment:view')) {
 267             // can not submit assignments -> no feedback
 268             return;
 269         }
 270
 271         if (!$submission) { /// Get submission for this assignment
 272             $submission = $this->get_submission($USER->id);
 273         }
 274         // Check the user can submit
 275         $cansubmit = has_capability('mod/assignment:submit', $this->context, $USER->id, false);
 276         // If not then check if the user still has the view cap and has a previous submission
 277         $cansubmit = $cansubmit || (!empty($submission) && has_capability('mod/assignment:view', $this->context, $USER->id, false));
 278
 279         if (!$cansubmit) {
 280             // can not submit assignments -> no feedback
 281             return;
 282         }
 283
 284         $grading_info = grade_get_grades($this->course->id, 'mod', 'assignment', $this->assignment->id, $USER->id);
 285         $item = $grading_info->items[0];
 286         $grade = $item->grades[$USER->id];
 287
 288         if ($grade->hidden or $grade->grade === false) { // hidden or error
 289             return;
 290         }
 291
 292         if ($grade->grade === null and empty($grade->str_feedback)) {   /// Nothing to show yet
 293             return;
 294         }
 295
 296         $graded_date = $grade->dategraded;
 297         $graded_by   = $grade->usermodified;
 298
 299     /// We need the teacher info
 300         if (!$teacher = $DB->get_record('user', array('id'=>$graded_by))) {
 301             print_error('cannotfindteacher');
 302         }
 303
 304     /// Print the feedback
 305         echo $OUTPUT->heading(get_string('feedbackfromteacher', 'assignment', fullname($teacher)));
 306
 307         echo '<table cellspacing="0" class="feedback">';
 308
 309         echo '<tr>';
 310         echo '<td class="left picture">';
 311         if ($teacher) {
 312             echo $OUTPUT->user_picture($teacher);
 313         }
 314         echo '</td>';
 315         echo '<td class="topic">';
 316         echo '<div class="from">';
 317         if ($teacher) {
 318             echo '<div class="fullname">'.fullname($teacher).'</div>';
 319         }
 320         echo '<div class="time">'.userdate($graded_date).'</div>';
 321         echo '</div>';
 322         echo '</td>';
 323         echo '</tr>';
 324
 325         echo '<tr>';
 326         echo '<td class="left side">&nbsp;</td>';
 327         echo '<td class="content">';
 328         echo '<div class="grade">';
 329         echo get_string("grade").': '.$grade->str_long_grade;
 330         echo '</div>';
 331         echo '<div class="clearer"></div>';
 332
 333         echo '<div class="comment">';
 334         echo $grade->str_feedback;
 335         echo '</div>';
 336         echo '</tr>';
 337
 338          if ($this->type == 'uploadsingle') { //@TODO: move to overload view_feedback method in the class or is uploadsingle merging into upload?
 339             $responsefiles = $this->print_responsefiles($submission->userid, true);
 340             if (!empty($responsefiles)) {
 341                 echo '<tr>';
 342                 echo '<td class="left side">&nbsp;</td>';
 343                 echo '<td class="content">';
 344                 echo $responsefiles;
 345                 echo '</tr>';
 346             }
 347          }
 348
 349         echo '</table>';
 350     }
 351
 352     /**
 353      * Returns a link with info about the state of the assignment submissions
 354      *
 355      * This is used by view_header to put this link at the top right of the page.
 356      * For teachers it gives the number of submitted assignments with a link
 357      * For students it gives the time of their submission.
 358      * This will be suitable for most assignment types.
 359      *
 360      * @global object
 361      * @global object
 362      * @param bool $allgroup print all groups info if user can access all groups, suitable for index.php
 363      * @return string
 364      */
 365     function submittedlink($allgroups=false) {
 366         global $USER;
 367         global $CFG;
 368
 369         $submitted = '';
 370         $urlbase = "{$CFG->wwwroot}/mod/assignment/";
 371
 372         $context = get_context_instance(CONTEXT_MODULE,$this->cm->id);
 373         if (has_capability('mod/assignment:grade', $context)) {
 374             if ($allgroups and has_capability('moodle/site:accessallgroups', $context)) {
 375                 $group = 0;
 376             } else {
 377                 $group = groups_get_activity_group($this->cm);
 378             }
 379             if ($count = $this->count_real_submissions($group)) {
 380                 $submitted = '<a href="'.$urlbase.'submissions.php?id='.$this->cm->id.'">'.
 381                              get_string('viewsubmissions', 'assignment', $count).'</a>';
 382             } else {
 383                 $submitted = '<a href="'.$urlbase.'submissions.php?id='.$this->cm->id.'">'.
 384                              get_string('noattempts', 'assignment').'</a>';
 385             }
 386         } else {
 387             if (isloggedin()) {
 388                 if ($submission = $this->get_submission($USER->id)) {
 389                     if ($submission->timemodified) {
 390                         if ($submission->timemodified <= $this->assignment->timedue || empty($this->assignment->timedue)) {
 391                             $submitted = '<span class="early">'.userdate($submission->timemodified).'</span>';
 392                         } else {
 393                             $submitted = '<span class="late">'.userdate($submission->timemodified).'</span>';
 394                         }
 395                     }
 396                 }
 397             }
 398         }
 399
 400         return $submitted;
 401     }
 402
 403
 404     /**
 405      * @todo Document this function
 406      */
 407     function setup_elements(&$mform) {
 408
 409     }
 410
 411     /**
 412      * Any preprocessing needed for the settings form for
 413      * this assignment type
 414      *
 415      * @param array $default_values - array to fill in with the default values
 416      *      in the form 'formelement' => 'value'
 417      * @param object $form - the form that is to be displayed
 418      * @return none
 419      */
 420     function form_data_preprocessing(&$default_values, $form) {
 421     }
 422
 423     /**
 424      * Any extra validation checks needed for the settings
 425      * form for this assignment type
 426      *
 427      * See lib/formslib.php, 'validation' function for details
 428      */
 429     function form_validation($data, $files) {
 430         return array();
 431     }
 432
 433     /**
 434      * Create a new assignment activity
 435      *
 436      * Given an object containing all the necessary data,
 437      * (defined by the form in mod_form.php) this function
 438      * will create a new instance and return the id number
 439      * of the new instance.
 440      * The due data is added to the calendar
 441      * This is common to all assignment types.
 442      *
 443      * @global object
 444      * @global object
 445      * @param object $assignment The data from the form on mod_form.php
 446      * @return int The id of the assignment
 447      */
 448     function add_instance($assignment) {
 449         global $COURSE, $DB;
 450
 451         $assignment->timemodified = time();
 452         $assignment->courseid = $assignment->course;
 453
 454         $returnid = $DB->insert_record("assignment", $assignment);
 455         $assignment->id = $returnid;
 456
 457         if ($assignment->timedue) {
 458             $event = new stdClass();
 459             $event->name        = $assignment->name;
 460             $event->description = format_module_intro('assignment', $assignment, $assignment->coursemodule);
 461             $event->courseid    = $assignment->course;
 462             $event->groupid     = 0;
 463             $event->userid      = 0;
 464             $event->modulename  = 'assignment';
 465             $event->instance    = $returnid;
 466             $event->eventtype   = 'due';
 467             $event->timestart   = $assignment->timedue;
 468             $event->timeduration = 0;
 469
 470             calendar_event::create($event);
 471         }
 472
 473         assignment_grade_item_update($assignment);
 474
 475         return $returnid;
 476     }
 477
 478     /**
 479      * Deletes an assignment activity
 480      *
 481      * Deletes all database records, files and calendar events for this assignment.
 482      *
 483      * @global object
 484      * @global object
 485      * @param object $assignment The assignment to be deleted
 486      * @return boolean False indicates error
 487      */
 488     function delete_instance($assignment) {
 489         global $CFG, $DB;
 490
 491         $assignment->courseid = $assignment->course;
 492
 493         $result = true;
 494
 495         // now get rid of all files
 496         $fs = get_file_storage();
 497         if ($cm = get_coursemodule_from_instance('assignment', $assignment->id)) {
 498             $context = get_context_instance(CONTEXT_MODULE, $cm->id);
 499             $fs->delete_area_files($context->id);
 500         }
 501
 502         if (! $DB->delete_records('assignment_submissions', array('assignment'=>$assignment->id))) {
 503             $result = false;
 504         }
 505
 506         if (! $DB->delete_records('event', array('modulename'=>'assignment', 'instance'=>$assignment->id))) {
 507             $result = false;
 508         }
 509
 510         if (! $DB->delete_records('assignment', array('id'=>$assignment->id))) {
 511             $result = false;
 512         }
 513         $mod = $DB->get_field('modules','id',array('name'=>'assignment'));
 514
 515         assignment_grade_item_delete($assignment);
 516
 517         return $result;
 518     }
 519
 520     /**
 521      * Updates a new assignment activity
 522      *
 523      * Given an object containing all the necessary data,
 524      * (defined by the form in mod_form.php) this function
 525      * will update the assignment instance and return the id number
 526      * The due date is updated in the calendar
 527      * This is common to all assignment types.
 528      *
 529      * @global object
 530      * @global object
 531      * @param object $assignment The data from the form on mod_form.php
 532      * @return bool success
 533      */
 534     function update_instance($assignment) {
 535         global $COURSE, $DB;
 536
 537         $assignment->timemodified = time();
 538
 539         $assignment->id = $assignment->instance;
 540         $assignment->courseid = $assignment->course;
 541
 542         $DB->update_record('assignment', $assignment);
 543
 544         if ($assignment->timedue) {
 545             $event = new stdClass();
 546
 547             if ($event->id = $DB->get_field('event', 'id', array('modulename'=>'assignment', 'instance'=>$assignment->id))) {
 548
 549                 $event->name        = $assignment->name;
 550                 $event->description = format_module_intro('assignment', $assignment, $assignment->coursemodule);
 551                 $event->timestart   = $assignment->timedue;
 552
 553                 $calendarevent = calendar_event::load($event->id);
 554                 $calendarevent->update($event);
 555             } else {
 556                 $event = new stdClass();
 557                 $event->name        = $assignment->name;
 558                 $event->description = format_module_intro('assignment', $assignment, $assignment->coursemodule);
 559                 $event->courseid    = $assignment->course;
 560                 $event->groupid     = 0;
 561                 $event->userid      = 0;
 562                 $event->modulename  = 'assignment';
 563                 $event->instance    = $assignment->id;
 564                 $event->eventtype   = 'due';
 565                 $event->timestart   = $assignment->timedue;
 566                 $event->timeduration = 0;
 567
 568                 calendar_event::create($event);
 569             }
 570         } else {
 571             $DB->delete_records('event', array('modulename'=>'assignment', 'instance'=>$assignment->id));
 572         }
 573
 574         // get existing grade item
 575         assignment_grade_item_update($assignment);
 576
 577         return true;
 578     }
 579
 580     /**
 581      * Update grade item for this submission.
 582      */
 583     function update_grade($submission) {
 584         assignment_update_grades($this->assignment, $submission->userid);
 585     }
 586
 587     /**
 588      * Top-level function for handling of submissions called by submissions.php
 589      *
 590      * This is for handling the teacher interaction with the grading interface
 591      * This should be suitable for most assignment types.
 592      *
 593      * @global object
 594      * @param string $mode Specifies the kind of teacher interaction taking place
 595      */
 596     function submissions($mode) {
 597         ///The main switch is changed to facilitate
 598         ///1) Batch fast grading
 599         ///2) Skip to the next one on the popup
 600         ///3) Save and Skip to the next one on the popup
 601
 602         //make user global so we can use the id
 603         global $USER, $OUTPUT, $DB, $PAGE;
 604
 605         $mailinfo = optional_param('mailinfo', null, PARAM_BOOL);
 606
 607         if (optional_param('next', null, PARAM_BOOL)) {
 608             $mode='next';
 609         }
 610         if (optional_param('saveandnext', null, PARAM_BOOL)) {
 611             $mode='saveandnext';
 612         }
 613
 614         if (is_null($mailinfo)) {
 615             if (optional_param('sesskey', null, PARAM_BOOL)) {
 616                 set_user_preference('assignment_mailinfo', $mailinfo);
 617             } else {
 618                 $mailinfo = get_user_preferences('assignment_mailinfo', 0);
 619             }
 620         } else {
 621             set_user_preference('assignment_mailinfo', $mailinfo);
 622         }
 623
 624         switch ($mode) {
 625             case 'grade':                         // We are in a main window grading
 626                 if ($submission = $this->process_feedback()) {
 627                     $this->display_submissions(get_string('changessaved'));
 628                 } else {
 629                     $this->display_submissions();
 630                 }
 631                 break;
 632
 633             case 'single':                        // We are in a main window displaying one submission
 634                 if ($submission = $this->process_feedback()) {
 635                     $this->display_submissions(get_string('changessaved'));
 636                 } else {
 637                     $this->display_submission();
 638                 }
 639                 break;
 640
 641             case 'all':                          // Main window, display everything
 642                 $this->display_submissions();
 643                 break;
 644
 645             case 'fastgrade':
 646                 ///do the fast grading stuff  - this process should work for all 3 subclasses
 647                 $grading    = false;
 648                 $commenting = false;
 649                 $col        = false;
 650                 if (isset($_POST['submissioncomment'])) {
 651                     $col = 'submissioncomment';
 652                     $commenting = true;
 653                 }
 654                 if (isset($_POST['menu'])) {
 655                     $col = 'menu';
 656                     $grading = true;
 657                 }
 658                 if (!$col) {
 659                     //both submissioncomment and grade columns collapsed..
 660                     $this->display_submissions();
 661                     break;
 662                 }
 663
 664                 foreach ($_POST[$col] as $id => $unusedvalue){
 665
 666                     $id = (int)$id; //clean parameter name
 667
 668                     $this->process_outcomes($id);
 669
 670                     if (!$submission = $this->get_submission($id)) {
 671                         $submission = $this->prepare_new_submission($id);
 672                         $newsubmission = true;
 673                     } else {
 674                         $newsubmission = false;
 675                     }
 676                     unset($submission->data1);  // Don't need to update this.
 677                     unset($submission->data2);  // Don't need to update this.
 678
 679                     //for fast grade, we need to check if any changes take place
 680                     $updatedb = false;
 681
 682                     if ($grading) {
 683                         $grade = $_POST['menu'][$id];
 684                         $updatedb = $updatedb || ($submission->grade != $grade);
 685                         $submission->grade = $grade;
 686                     } else {
 687                         if (!$newsubmission) {
 688                             unset($submission->grade);  // Don't need to update this.
 689                         }
 690                     }
 691                     if ($commenting) {
 692                         $commentvalue = trim($_POST['submissioncomment'][$id]);
 693                         $updatedb = $updatedb || ($submission->submissioncomment != $commentvalue);
 694                         $submission->submissioncomment = $commentvalue;
 695                     } else {
 696                         unset($submission->submissioncomment);  // Don't need to update this.
 697                     }
 698
 699                     $submission->teacher    = $USER->id;
 700                     if ($updatedb) {
 701                         $submission->mailed = (int)(!$mailinfo);
 702                     }
 703
 704                     $submission->timemarked = time();
 705
 706                     //if it is not an update, we don't change the last modified time etc.
 707                     //this will also not write into database if no submissioncomment and grade is entered.
 708
 709                     if ($updatedb){
 710                         if ($newsubmission) {
 711                             if (!isset($submission->submissioncomment)) {
 712                                 $submission->submissioncomment = '';
 713                             }
 714                             $sid = $DB->insert_record('assignment_submissions', $submission);
 715                             $submission->id = $sid;
 716                         } else {
 717                             $DB->update_record('assignment_submissions', $submission);
 718                         }
 719
 720                         // trigger grade event
 721                         $this->update_grade($submission);
 722
 723                         //add to log only if updating
 724                         add_to_log($this->course->id, 'assignment', 'update grades',
 725                                    'submissions.php?id='.$this->cm->id.'&user='.$submission->userid,
 726                                    $submission->userid, $this->cm->id);
 727                     }
 728
 729                 }
 730
 731                 $message = $OUTPUT->notification(get_string('changessaved'), 'notifysuccess');
 732
 733                 $this->display_submissions($message);
 734                 break;
 735
 736
 737             case 'saveandnext':
 738                 ///We are in pop up. save the current one and go to the next one.
 739                 //first we save the current changes
 740                 if ($submission = $this->process_feedback()) {
 741                     //print_heading(get_string('changessaved'));
 742                     //$extra_javascript = $this->update_main_listing($submission);
 743                 }
 744
 745             case 'next':
 746                 /// We are currently in pop up, but we want to skip to next one without saving.
 747                 ///    This turns out to be similar to a single case
 748                 /// The URL used is for the next submission.
 749                 $offset = required_param('offset', PARAM_INT);
 750                 $nextid = required_param('nextid', PARAM_INT);
 751                 $id = required_param('id', PARAM_INT);
 752                 $offset = (int)$offset+1;
 753                 //$this->display_submission($offset+1 , $nextid);
 754                 redirect('submissions.php?id='.$id.'&userid='. $nextid . '&mode=single&offset='.$offset);
 755                 break;
 756
 757             case 'singlenosave':
 758                 $this->display_submission();
 759                 break;
 760
 761             default:
 762                 echo "something seriously is wrong!!";
 763                 break;
 764         }
 765     }
 766
 767     /**
 768      * Helper method updating the listing on the main script from popup using javascript
 769      *
 770      * @global object
 771      * @global object
 772      * @param $submission object The submission whose data is to be updated on the main page
 773      */
 774     function update_main_listing($submission) {
 775         global $SESSION, $CFG, $OUTPUT;
 776
 777         $output = '';
 778
 779         $perpage = get_user_preferences('assignment_perpage', 10);
 780
 781         $quickgrade = get_user_preferences('assignment_quickgrade', 0);
 782
 783         /// Run some Javascript to try and update the parent page
 784         $output .= '<script type="text/javascript">'."\n<!--\n";
 785         if (empty($SESSION->flextable['mod-assignment-submissions']->collapse['submissioncomment'])) {
 786             if ($quickgrade){
 787                 $output.= 'opener.document.getElementById("submissioncomment'.$submission->userid.'").value="'
 788                 .trim($submission->submissioncomment).'";'."\n";
 789              } else {
 790                 $output.= 'opener.document.getElementById("com'.$submission->userid.
 791                 '").innerHTML="'.shorten_text(trim(strip_tags($submission->submissioncomment)), 15)."\";\n";
 792             }
 793         }
 794
 795         if (empty($SESSION->flextable['mod-assignment-submissions']->collapse['grade'])) {
 796             //echo optional_param('menuindex');
 797             if ($quickgrade){
 798                 $output.= 'opener.document.getElementById("menumenu'.$submission->userid.
 799                 '").selectedIndex="'.optional_param('menuindex', 0, PARAM_INT).'";'."\n";
 800             } else {
 801                 $output.= 'opener.document.getElementById("g'.$submission->userid.'").innerHTML="'.
 802                 $this->display_grade($submission->grade)."\";\n";
 803             }
 804         }
 805         //need to add student's assignments in there too.
 806         if (empty($SESSION->flextable['mod-assignment-submissions']->collapse['timemodified']) &&
 807             $submission->timemodified) {
 808             $output.= 'opener.document.getElementById("ts'.$submission->userid.
 809                  '").innerHTML="'.addslashes_js($this->print_student_answer($submission->userid)).userdate($submission->timemodified)."\";\n";
 810         }
 811
 812         if (empty($SESSION->flextable['mod-assignment-submissions']->collapse['timemarked']) &&
 813             $submission->timemarked) {
 814             $output.= 'opener.document.getElementById("tt'.$submission->userid.
 815                  '").innerHTML="'.userdate($submission->timemarked)."\";\n";
 816         }
 817
 818         if (empty($SESSION->flextable['mod-assignment-submissions']->collapse['status'])) {
 819             $output.= 'opener.document.getElementById("up'.$submission->userid.'").className="s1";';
 820             $buttontext = get_string('update');
 821             $url = new moodle_url('/mod/assignment/submissions.php', array(
 822                     'id' => $this->cm->id,
 823                     'userid' => $submission->userid,
 824                     'mode' => 'single',
 825                     'offset' => (optional_param('offset', '', PARAM_INT)-1)));
 826             $button = $OUTPUT->action_link($url, $buttontext, new popup_action('click', $url, 'grade'.$submission->userid, array('height' => 450, 'width' => 700)), array('ttile'=>$buttontext));
 827
 828             $output .= 'opener.document.getElementById("up'.$submission->userid.'").innerHTML="'.addslashes_js($button).'";';
 829         }
 830
 831         $grading_info = grade_get_grades($this->course->id, 'mod', 'assignment', $this->assignment->id, $submission->userid);
 832
 833         if (empty($SESSION->flextable['mod-assignment-submissions']->collapse['finalgrade'])) {
 834             $output.= 'opener.document.getElementById("finalgrade_'.$submission->userid.
 835             '").innerHTML="'.$grading_info->items[0]->grades[$submission->userid]->str_grade.'";'."\n";
 836         }
 837
 838         if (!empty($CFG->enableoutcomes) and empty($SESSION->flextable['mod-assignment-submissions']->collapse['outcome'])) {
 839
 840             if (!empty($grading_info->outcomes)) {
 841                 foreach($grading_info->outcomes as $n=>$outcome) {
 842                     if ($outcome->grades[$submission->userid]->locked) {
 843                         continue;
 844                     }
 845
 846                     if ($quickgrade){
 847                         $output.= 'opener.document.getElementById("outcome_'.$n.'_'.$submission->userid.
 848                         '").selectedIndex="'.$outcome->grades[$submission->userid]->grade.'";'."\n";
 849
 850                     } else {
 851                         $options = make_grades_menu(-$outcome->scaleid);
 852                         $options[0] = get_string('nooutcome', 'grades');
 853                         $output.= 'opener.document.getElementById("outcome_'.$n.'_'.$submission->userid.'").innerHTML="'.$options[$outcome->grades[$submission->userid]->grade]."\";\n";
 854                     }
 855
 856                 }
 857             }
 858         }
 859
 860         $output .= "\n-->\n</script>";
 861         return $output;
 862     }
 863
 864     /**
 865      *  Return a grade in user-friendly form, whether it's a scale or not
 866      *
 867      * @global object
 868      * @param mixed $grade
 869      * @return string User-friendly representation of grade
 870      */
 871     function display_grade($grade) {
 872         global $DB;
 873
 874         static $scalegrades = array();   // Cache scales for each assignment - they might have different scales!!
 875
 876         if ($this->assignment->grade >= 0) {    // Normal number
 877             if ($grade == -1) {
 878                 return '-';
 879             } else {
 880                 return $grade.' / '.$this->assignment->grade;
 881             }
 882
 883         } else {                                // Scale
 884             if (empty($scalegrades[$this->assignment->id])) {
 885                 if ($scale = $DB->get_record('scale', array('id'=>-($this->assignment->grade)))) {
 886                     $scalegrades[$this->assignment->id] = make_menu_from_list($scale->scale);
 887                 } else {
 888                     return '-';
 889                 }
 890             }
 891             if (isset($scalegrades[$this->assignment->id][$grade])) {
 892                 return $scalegrades[$this->assignment->id][$grade];
 893             }
 894             return '-';
 895         }
 896     }
 897
 898     /**
 899      *  Display a single submission, ready for grading on a popup window
 900      *
 901      * This default method prints the teacher info and submissioncomment box at the top and
 902      * the student info and submission at the bottom.
 903      * This method also fetches the necessary data in order to be able to
 904      * provide a "Next submission" button.
 905      * Calls preprocess_submission() to give assignment type plug-ins a chance
 906      * to process submissions before they are graded
 907      * This method gets its arguments from the page parameters userid and offset
 908      *
 909      * @global object
 910      * @global object
 911      * @param string $extra_javascript
 912      */
 913     function display_submission($offset=-1,$userid =-1, $display=true) {
 914         global $CFG, $DB, $PAGE, $OUTPUT;
 915         require_once($CFG->libdir.'/gradelib.php');
 916         require_once($CFG->libdir.'/tablelib.php');
 917         require_once("$CFG->dirroot/repository/lib.php");
 918         if ($userid==-1) {
 919             $userid = required_param('userid', PARAM_INT);
 920         }
 921         if ($offset==-1) {
 922             $offset = required_param('offset', PARAM_INT);//offset for where to start looking for student.
 923         }
 924         $filter = optional_param('filter', 0, PARAM_INT);
 925
 926         if (!$user = $DB->get_record('user', array('id'=>$userid))) {
 927             print_error('nousers');
 928         }
 929
 930         if (!$submission = $this->get_submission($user->id)) {
 931             $submission = $this->prepare_new_submission($userid);
 932         }
 933         if ($submission->timemodified > $submission->timemarked) {
 934             $subtype = 'assignmentnew';
 935         } else {
 936             $subtype = 'assignmentold';
 937         }
 938
 939         $grading_info = grade_get_grades($this->course->id, 'mod', 'assignment', $this->assignment->id, array($user->id));
 940         $gradingdisabled = $grading_info->items[0]->grades[$userid]->locked || $grading_info->items[0]->grades[$userid]->overridden;
 941
 942     /// construct SQL, using current offset to find the data of the next student
 943         $course     = $this->course;
 944         $assignment = $this->assignment;
 945         $cm         = $this->cm;
 946         $context    = get_context_instance(CONTEXT_MODULE, $cm->id);
 947
 948         /// Get all ppl that can submit assignments
 949
 950         $currentgroup = groups_get_activity_group($cm);
 951         $users = get_enrolled_users($context, 'mod/assignment:view', $currentgroup, 'u.id');
 952         if ($users) {
 953             $users = array_keys($users);
 954             // if groupmembersonly used, remove users who are not in any group
 955             if (!empty($CFG->enablegroupmembersonly) and $cm->groupmembersonly) {
 956                 if ($groupingusers = groups_get_grouping_members($cm->groupingid, 'u.id', 'u.id')) {
 957                     $users = array_intersect($users, array_keys($groupingusers));
 958                 }
 959             }
 960         }
 961
 962         $nextid = 0;
 963         $where = '';
 964         if($filter == 'submitted') {
 965             $where .= 's.timemodified > 0 AND ';
 966         } else if($filter == 'requiregrading') {
 967             $where .= 's.timemarked < s.timemodified AND ';
 968         }
 969
 970         if ($users) {
 971             $userfields = user_picture::fields('u', array('lastaccess'));
 972             $select = "SELECT $userfields,
 973                               s.id AS submissionid, s.grade, s.submissioncomment,
 974                               s.timemodified, s.timemarked ";
 975             $sql = 'FROM {user} u '.
 976                    'LEFT JOIN {assignment_submissions} s ON u.id = s.userid
 977                    AND s.assignment = '.$this->assignment->id.' '.
 978                    'WHERE '.$where.'u.id IN ('.implode(',', $users).') ';
 979
 980             if ($sort = flexible_table::get_sort_for_table('mod-assignment-submissions')) {
 981                 $sort = 'ORDER BY '.$sort.' ';
 982             }
 983             $auser = $DB->get_records_sql($select.$sql.$sort, null, $offset, 2);
 984
 985             if (is_array($auser) && count($auser)>1) {
 986                 $nextuser = next($auser);
 987             /// Calculate user status
 988                 $nextuser->status = ($nextuser->timemarked > 0) && ($nextuser->timemarked >= $nextuser->timemodified);
 989                 $nextid = $nextuser->id;
 990             }
 991         }
 992
 993         if ($submission->teacher) {
 994             $teacher = $DB->get_record('user', array('id'=>$submission->teacher));
 995         } else {
 996             global $USER;
 997             $teacher = $USER;
 998         }
 999
1000         $this->preprocess_submission($submission);
1001
1002         $mformdata = new stdClass();
1003         $mformdata->context = $this->context;
1004         $mformdata->maxbytes = $this->course->maxbytes;
1005         $mformdata->courseid = $this->course->id;
1006         $mformdata->teacher = $teacher;
1007         $mformdata->assignment = $assignment;
1008         $mformdata->submission = $submission;
1009         $mformdata->lateness = $this->display_lateness($submission->timemodified);
1010         $mformdata->auser = $auser;
1011         $mformdata->user = $user;
1012         $mformdata->offset = $offset;
1013         $mformdata->userid = $userid;
1014         $mformdata->cm = $this->cm;
1015         $mformdata->grading_info = $grading_info;
1016         $mformdata->enableoutcomes = $CFG->enableoutcomes;
1017         $mformdata->grade = $this->assignment->grade;
1018         $mformdata->gradingdisabled = $gradingdisabled;
1019         $mformdata->nextid = $nextid;
1020         $mformdata->submissioncomment= $submission->submissioncomment;
1021         $mformdata->submissioncommentformat= FORMAT_HTML;
1022         $mformdata->submission_content= $this->print_user_files($user->id,true);
1023         $mformdata->filter = $filter;
1024         $mformdata->mailinfo = get_user_preferences('assignment_mailinfo', 0);
1025          if ($assignment->assignmenttype == 'upload') {
1026             $mformdata->fileui_options = array('subdirs'=>1, 'maxbytes'=>$assignment->maxbytes, 'maxfiles'=>$assignment->var1, 'accepted_types'=>'*', 'return_types'=>FILE_INTERNAL);
1027         } elseif ($assignment->assignmenttype == 'uploadsingle') {
1028             $mformdata->fileui_options = array('subdirs'=>0, 'maxbytes'=>$CFG->userquota, 'maxfiles'=>1, 'accepted_types'=>'*', 'return_types'=>FILE_INTERNAL);
1029         }
1030
1031         $submitform = new mod_assignment_grading_form( null, $mformdata );
1032
1033          if (!$display) {
1034             $ret_data = new stdClass();
1035             $ret_data->mform = $submitform;
1036             $ret_data->fileui_options = $mformdata->fileui_options;
1037             return $ret_data;
1038         }
1039
1040         if ($submitform->is_cancelled()) {
1041             redirect('submissions.php?id='.$this->cm->id);
1042         }
1043
1044         $submitform->set_data($mformdata);
1045
1046         $PAGE->set_title($this->course->fullname . ': ' .get_string('feedback', 'assignment').' - '.fullname($user, true));
1047         $PAGE->set_heading($this->course->fullname);
1048         $PAGE->navbar->add(get_string('submissions', 'assignment'), new moodle_url('/mod/assignment/submissions.php', array('id'=>$cm->id)));
1049         $PAGE->navbar->add(fullname($user, true));
1050
1051         echo $OUTPUT->header();
1052         echo $OUTPUT->heading(get_string('feedback', 'assignment').': '.fullname($user, true));
1053
1054         // display mform here...
1055         $submitform->display();
1056
1057         $customfeedback = $this->custom_feedbackform($submission, true);
1058         if (!empty($customfeedback)) {
1059             echo $customfeedback;
1060         }
1061
1062         echo $OUTPUT->footer();
1063     }
1064
1065     /**
1066      *  Preprocess submission before grading
1067      *
1068      * Called by display_submission()
1069      * The default type does nothing here.
1070      *
1071      * @param object $submission The submission object
1072      */
1073     function preprocess_submission(&$submission) {
1074     }
1075
1076     /**
1077      *  Display all the submissions ready for grading
1078      *
1079      * @global object
1080      * @global object
1081      * @global object
1082      * @global object
1083      * @param string $message
1084      * @return bool|void
1085      */
1086     function display_submissions($message='') {
1087         global $CFG, $DB, $USER, $DB, $OUTPUT, $PAGE;
1088         require_once($CFG->libdir.'/gradelib.php');
1089
1090         /* first we check to see if the form has just been submitted
1091          * to request user_preference updates
1092          */
1093
1094        $filters = array(self::FILTER_ALL             => get_string('all'),
1095                         self::FILTER_SUBMITTED       => get_string('submitted', 'assignment'),
1096                         self::FILTER_REQUIRE_GRADING => get_string('requiregrading', 'assignment'));
1097
1098         $updatepref = optional_param('updatepref', 0, PARAM_INT);
1099
1100         if (isset($_POST['updatepref'])){
1101             $perpage = optional_param('perpage', 10, PARAM_INT);
1102             $perpage = ($perpage <= 0) ? 10 : $perpage ;
1103             $filter = optional_param('filter', 0, PARAM_INT);
1104             set_user_preference('assignment_perpage', $perpage);
1105             set_user_preference('assignment_quickgrade', optional_param('quickgrade', 0, PARAM_BOOL));
1106             set_user_preference('assignment_filter', $filter);
1107         }
1108
1109         /* next we get perpage and quickgrade (allow quick grade) params
1110          * from database
1111          */
1112         $perpage    = get_user_preferences('assignment_perpage', 10);
1113         $quickgrade = get_user_preferences('assignment_quickgrade', 0);
1114         $filter = get_user_preferences('assignment_filter', 0);
1115         $grading_info = grade_get_grades($this->course->id, 'mod', 'assignment', $this->assignment->id);
1116
1117         if (!empty($CFG->enableoutcomes) and !empty($grading_info->outcomes)) {
1118             $uses_outcomes = true;
1119         } else {
1120             $uses_outcomes = false;
1121         }
1122
1123         $page    = optional_param('page', 0, PARAM_INT);
1124         $strsaveallfeedback = get_string('saveallfeedback', 'assignment');
1125
1126     /// Some shortcuts to make the code read better
1127
1128         $course     = $this->course;
1129         $assignment = $this->assignment;
1130         $cm         = $this->cm;
1131         $hassubmission = false;
1132
1133         $tabindex = 1; //tabindex for quick grading tabbing; Not working for dropdowns yet
1134         add_to_log($course->id, 'assignment', 'view submission', 'submissions.php?id='.$this->cm->id, $this->assignment->id, $this->cm->id);
1135
1136         $PAGE->set_title(format_string($this->assignment->name,true));
1137         $PAGE->set_heading($this->course->fullname);
1138         echo $OUTPUT->header();
1139
1140         echo '<div class="usersubmissions">';
1141
1142         //hook to allow plagiarism plugins to update status/print links.
1143         plagiarism_update_status($this->course, $this->cm);
1144
1145         $course_context = get_context_instance(CONTEXT_COURSE, $course->id);
1146         if (has_capability('gradereport/grader:view', $course_context) && has_capability('moodle/grade:viewall', $course_context)) {
1147             echo '<div class="allcoursegrades"><a href="' . $CFG->wwwroot . '/grade/report/grader/index.php?id=' . $course->id . '">'
1148                 . get_string('seeallcoursegrades', 'grades') . '</a></div>';
1149         }
1150
1151         if (!empty($message)) {
1152             echo $message;   // display messages here if any
1153         }
1154
1155         $context = get_context_instance(CONTEXT_MODULE, $cm->id);
1156
1157     /// Check to see if groups are being used in this assignment
1158
1159         /// find out current groups mode
1160         $groupmode = groups_get_activity_groupmode($cm);
1161         $currentgroup = groups_get_activity_group($cm, true);
1162         groups_print_activity_menu($cm, $CFG->wwwroot . '/mod/assignment/submissions.php?id=' . $this->cm->id);
1163
1164         /// Print quickgrade form around the table
1165         if ($quickgrade) {
1166             $formattrs = array();
1167             $formattrs['action'] = new moodle_url('/mod/assignment/submissions.php');
1168             $formattrs['id'] = 'fastg';
1169             $formattrs['method'] = 'post';
1170
1171             echo html_writer::start_tag('form', $formattrs);
1172             echo html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>'id',      'value'=> $this->cm->id));
1173             echo html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>'mode',    'value'=> 'fastgrade'));
1174             echo html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>'page',    'value'=> $page));
1175             echo html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>'sesskey', 'value'=> sesskey()));
1176         }
1177
1178         /// Get all ppl that are allowed to submit assignments
1179         list($esql, $params) = get_enrolled_sql($context, 'mod/assignment:view', $currentgroup);
1180
1181         if ($filter == self::FILTER_ALL) {
1182             $sql = "SELECT u.id FROM {user} u ".
1183                    "LEFT JOIN ($esql) eu ON eu.id=u.id ".
1184                    "WHERE u.deleted = 0 AND eu.id=u.id ";
1185         } else {
1186             $wherefilter = '';
1187             if($filter == self::FILTER_SUBMITTED) {
1188                $wherefilter = ' AND s.timemodified > 0';
1189             } else if($filter == self::FILTER_REQUIRE_GRADING) {
1190                 $wherefilter = ' AND s.timemarked < s.timemodified ';
1191             }
1192
1193             $sql = "SELECT u.id FROM {user} u ".
1194                    "LEFT JOIN ($esql) eu ON eu.id=u.id ".
1195                    "LEFT JOIN {assignment_submissions} s ON (u.id = s.userid) " .
1196                    "WHERE u.deleted = 0 AND eu.id=u.id ".
1197                    'AND s.assignment = '. $this->assignment->id .
1198                     $wherefilter;
1199         }
1200
1201         $users = $DB->get_records_sql($sql, $params);
1202         if (!empty($users)) {
1203             $users = array_keys($users);
1204         }
1205
1206         // if groupmembersonly used, remove users who are not in any group
1207         if ($users and !empty($CFG->enablegroupmembersonly) and $cm->groupmembersonly) {
1208             if ($groupingusers = groups_get_grouping_members($cm->groupingid, 'u.id', 'u.id')) {
1209                 $users = array_intersect($users, array_keys($groupingusers));
1210             }
1211         }
1212
1213         $tablecolumns = array('picture', 'fullname', 'grade', 'submissioncomment', 'timemodified', 'timemarked', 'status', 'finalgrade');
1214         if ($uses_outcomes) {
1215             $tablecolumns[] = 'outcome'; // no sorting based on outcomes column
1216         }
1217
1218         $tableheaders = array('',
1219                               get_string('fullnameuser'),
1220                               get_string('grade'),
1221                               get_string('comment', 'assignment'),
1222                               get_string('lastmodified').' ('.get_string('submission', 'assignment').')',
1223                               get_string('lastmodified').' ('.get_string('grade').')',
1224                               get_string('status'),
1225                               get_string('finalgrade', 'grades'));
1226         if ($uses_outcomes) {
1227             $tableheaders[] = get_string('outcome', 'grades');
1228         }
1229
1230         require_once($CFG->libdir.'/tablelib.php');
1231         $table = new flexible_table('mod-assignment-submissions');
1232
1233         $table->define_columns($tablecolumns);
1234         $table->define_headers($tableheaders);
1235         $table->define_baseurl($CFG->wwwroot.'/mod/assignment/submissions.php?id='.$this->cm->id.'&amp;currentgroup='.$currentgroup);
1236
1237         $table->sortable(true, 'lastname');//sorted by lastname by default
1238         $table->collapsible(true);
1239         $table->initialbars(true);
1240
1241         $table->column_suppress('picture');
1242         $table->column_suppress('fullname');
1243
1244         $table->column_class('picture', 'picture');
1245         $table->column_class('fullname', 'fullname');
1246         $table->column_class('grade', 'grade');
1247         $table->column_class('submissioncomment', 'comment');
1248         $table->column_class('timemodified', 'timemodified');
1249         $table->column_class('timemarked', 'timemarked');
1250         $table->column_class('status', 'status');
1251         $table->column_class('finalgrade', 'finalgrade');
1252         if ($uses_outcomes) {
1253             $table->column_class('outcome', 'outcome');
1254         }
1255
1256         $table->set_attribute('cellspacing', '0');
1257         $table->set_attribute('id', 'attempts');
1258         $table->set_attribute('class', 'submissions');
1259         $table->set_attribute('width', '100%');
1260         //$table->set_attribute('align', 'center');
1261
1262         $table->no_sorting('finalgrade');
1263         $table->no_sorting('outcome');
1264
1265         // Start working -- this is necessary as soon as the niceties are over
1266         $table->setup();
1267
1268     /// Construct the SQL
1269         list($where, $params) = $table->get_sql_where();
1270         if ($where) {
1271             $where .= ' AND ';
1272         }
1273
1274         if ($filter == self::FILTER_SUBMITTED) {
1275            $where .= 's.timemodified > 0 AND ';
1276         } else if($filter == self::FILTER_REQUIRE_GRADING) {
1277            $where .= 's.timemarked < s.timemodified AND ';
1278         }
1279
1280         if ($sort = $table->get_sql_sort()) {
1281             $sort = ' ORDER BY '.$sort;
1282         }
1283
1284         $ufields = user_picture::fields('u');
1285         if (!empty($users)) {
1286             $select = "SELECT $ufields,
1287                               s.id AS submissionid, s.grade, s.submissioncomment,
1288                               s.timemodified, s.timemarked ";
1289             $sql = 'FROM {user} u '.
1290                    'LEFT JOIN {assignment_submissions} s ON u.id = s.userid
1291                     AND s.assignment = '.$this->assignment->id.' '.
1292                    'WHERE '.$where.'u.id IN ('.implode(',',$users).') ';
1293
1294             $ausers = $DB->get_records_sql($select.$sql.$sort, $params, $table->get_page_start(), $table->get_page_size());
1295
1296             $table->pagesize($perpage, count($users));
1297
1298             ///offset used to calculate index of student in that particular query, needed for the pop up to know who's next
1299             $offset = $page * $perpage;
1300             $strupdate = get_string('update');
1301             $strgrade  = get_string('grade');
1302             $grademenu = make_grades_menu($this->assignment->grade);
1303
1304             if ($ausers !== false) {
1305                 $grading_info = grade_get_grades($this->course->id, 'mod', 'assignment', $this->assignment->id, array_keys($ausers));
1306                 $endposition = $offset + $perpage;
1307                 $currentposition = 0;
1308                 foreach ($ausers as $auser) {
1309                     if ($currentposition == $offset && $offset < $endposition) {
1310                         $final_grade = $grading_info->items[0]->grades[$auser->id];
1311                         $grademax = $grading_info->items[0]->grademax;
1312                         $final_grade->formatted_grade = round($final_grade->grade,2) .' / ' . round($grademax,2);
1313                         $locked_overridden = 'locked';
1314                         if ($final_grade->overridden) {
1315                             $locked_overridden = 'overridden';
1316                         }
1317
1318                     /// Calculate user status
1319                         $auser->status = ($auser->timemarked > 0) && ($auser->timemarked >= $auser->timemodified);
1320                         $picture = $OUTPUT->user_picture($auser);
1321
1322                         if (empty($auser->submissionid)) {
1323                             $auser->grade = -1; //no submission yet
1324                         }
1325
1326                         if (!empty($auser->submissionid)) {
1327                             $hassubmission = true;
1328                         ///Prints student answer and student modified date
1329                         ///attach file or print link to student answer, depending on the type of the assignment.
1330                         ///Refer to print_student_answer in inherited classes.
1331                             if ($auser->timemodified > 0) {
1332                                 $studentmodified = '<div id="ts'.$auser->id.'">'.$this->print_student_answer($auser->id)
1333                                                  . userdate($auser->timemodified).'</div>';
1334                             } else {
1335                                 $studentmodified = '<div id="ts'.$auser->id.'">&nbsp;</div>';
1336                             }
1337                         ///Print grade, dropdown or text
1338                             if ($auser->timemarked > 0) {
1339                                 $teachermodified = '<div id="tt'.$auser->id.'">'.userdate($auser->timemarked).'</div>';
1340
1341                                 if ($final_grade->locked or $final_grade->overridden) {
1342                                     $grade = '<div id="g'.$auser->id.'" class="'. $locked_overridden .'">'.$final_grade->formatted_grade.'</div>';
1343                                 } else if ($quickgrade) {
1344                                     $attributes = array();
1345                                     $attributes['tabindex'] = $tabindex++;
1346                                     $menu = html_writer::select(make_grades_menu($this->assignment->grade), 'menu['.$auser->id.']', $auser->grade, array(-1=>get_string('nograde')), $attributes);
1347                                     $grade = '<div id="g'.$auser->id.'">'. $menu .'</div>';
1348                                 } else {
1349                                     $grade = '<div id="g'.$auser->id.'">'.$this->display_grade($auser->grade).'</div>';
1350                                 }
1351
1352                             } else {
1353                                 $teachermodified = '<div id="tt'.$auser->id.'">&nbsp;</div>';
1354                                 if ($final_grade->locked or $final_grade->overridden) {
1355                                     $grade = '<div id="g'.$auser->id.'" class="'. $locked_overridden .'">'.$final_grade->formatted_grade.'</div>';
1356                                 } else if ($quickgrade) {
1357                                     $attributes = array();
1358                                     $attributes['tabindex'] = $tabindex++;
1359                                     $menu = html_writer::select(make_grades_menu($this->assignment->grade), 'menu['.$auser->id.']', $auser->grade, array(-1=>get_string('nograde')), $attributes);
1360                                     $grade = '<div id="g'.$auser->id.'">'.$menu.'</div>';
1361                                 } else {
1362                                     $grade = '<div id="g'.$auser->id.'">'.$this->display_grade($auser->grade).'</div>';
1363                                 }
1364                             }
1365                         ///Print Comment
1366                             if ($final_grade->locked or $final_grade->overridden) {
1367                                 $comment = '<div id="com'.$auser->id.'">'.shorten_text(strip_tags($final_grade->str_feedback),15).'</div>';
1368
1369                             } else if ($quickgrade) {
1370                                 $comment = '<div id="com'.$auser->id.'">'
1371                                          . '<textarea tabindex="'.$tabindex++.'" name="submissioncomment['.$auser->id.']" id="submissioncomment'
1372                                          . $auser->id.'" rows="2" cols="20">'.($auser->submissioncomment).'</textarea></div>';
1373                             } else {
1374                                 $comment = '<div id="com'.$auser->id.'">'.shorten_text(strip_tags($auser->submissioncomment),15).'</div>';
1375                             }
1376                         } else {
1377                             $studentmodified = '<div id="ts'.$auser->id.'">&nbsp;</div>';
1378                             $teachermodified = '<div id="tt'.$auser->id.'">&nbsp;</div>';
1379                             $status          = '<div id="st'.$auser->id.'">&nbsp;</div>';
1380
1381                             if ($final_grade->locked or $final_grade->overridden) {
1382                                 $grade = '<div id="g'.$auser->id.'">'.$final_grade->formatted_grade . '</div>';
1383                                 $hassubmission = true;
1384                             } else if ($quickgrade) {   // allow editing
1385                                 $attributes = array();
1386                                 $attributes['tabindex'] = $tabindex++;
1387                                 $menu = html_writer::select(make_grades_menu($this->assignment->grade), 'menu['.$auser->id.']', $auser->grade, array(-1=>get_string('nograde')), $attributes);
1388                                 $grade = '<div id="g'.$auser->id.'">'.$menu.'</div>';
1389                                 $hassubmission = true;
1390                             } else {
1391                                 $grade = '<div id="g'.$auser->id.'">-</div>';
1392                             }
1393
1394                             if ($final_grade->locked or $final_grade->overridden) {
1395                                 $comment = '<div id="com'.$auser->id.'">'.$final_grade->str_feedback.'</div>';
1396                             } else if ($quickgrade) {
1397                                 $comment = '<div id="com'.$auser->id.'">'
1398                                          . '<textarea tabindex="'.$tabindex++.'" name="submissioncomment['.$auser->id.']" id="submissioncomment'
1399                                          . $auser->id.'" rows="2" cols="20">'.($auser->submissioncomment).'</textarea></div>';
1400                             } else {
1401                                 $comment = '<div id="com'.$auser->id.'">&nbsp;</div>';
1402                             }
1403                         }
1404
1405                         if (empty($auser->status)) { /// Confirm we have exclusively 0 or 1
1406                             $auser->status = 0;
1407                         } else {
1408                             $auser->status = 1;
1409                         }
1410
1411                         $buttontext = ($auser->status == 1) ? $strupdate : $strgrade;
1412
1413                         ///No more buttons, we use popups ;-).
1414                         $popup_url = '/mod/assignment/submissions.php?id='.$this->cm->id
1415                                    . '&amp;userid='.$auser->id.'&amp;mode=single'.'&amp;filter='.$filter.'&amp;offset='.$offset++;
1416
1417                         $button = $OUTPUT->action_link($popup_url, $buttontext);
1418
1419                         $status  = '<div id="up'.$auser->id.'" class="s'.$auser->status.'">'.$button.'</div>';
1420
1421                         $finalgrade = '<span id="finalgrade_'.$auser->id.'">'.$final_grade->str_grade.'</span>';
1422
1423                         $outcomes = '';
1424
1425                         if ($uses_outcomes) {
1426
1427                             foreach($grading_info->outcomes as $n=>$outcome) {
1428                                 $outcomes .= '<div class="outcome"><label>'.$outcome->name.'</label>';
1429                                 $options = make_grades_menu(-$outcome->scaleid);
1430
1431                                 if ($outcome->grades[$auser->id]->locked or !$quickgrade) {
1432                                     $options[0] = get_string('nooutcome', 'grades');
1433                                     $outcomes .= ': <span id="outcome_'.$n.'_'.$auser->id.'">'.$options[$outcome->grades[$auser->id]->grade].'</span>';
1434                                 } else {
1435                                     $attributes = array();
1436                                     $attributes['tabindex'] = $tabindex++;
1437                                     $attributes['id'] = 'outcome_'.$n.'_'.$auser->id;
1438                                     $outcomes .= ' '.html_writer::select($options, 'outcome_'.$n.'['.$auser->id.']', $outcome->grades[$auser->id]->grade, array(0=>get_string('nooutcome', 'grades')), $attributes);
1439                                 }
1440                                 $outcomes .= '</div>';
1441                             }
1442                         }
1443
1444                         $userlink = '<a href="' . $CFG->wwwroot . '/user/view.php?id=' . $auser->id . '&amp;course=' . $course->id . '">' . fullname($auser, has_capability('moodle/site:viewfullnames', $this->context)) . '</a>';
1445                         $row = array($picture, $userlink, $grade, $comment, $studentmodified, $teachermodified, $status, $finalgrade);
1446                         if ($uses_outcomes) {
1447                             $row[] = $outcomes;
1448                         }
1449                         $table->add_data($row);
1450                     }
1451                     $currentposition++;
1452                 }
1453             }
1454             if ($hassubmission && ($this->assignment->assignmenttype=='upload' || $this->assignment->assignmenttype=='online' || $this->assignment->assignmenttype=='uploadsingle')) { //TODO: this is an ugly hack, where is the plugin spirit? (skodak)
1455                 echo html_writer::start_tag('div', array('class' => 'mod-assignment-download-link'));
1456                 echo html_writer::link(new moodle_url('/mod/assignment/submissions.php', array('id' => $this->cm->id, 'download' => 'zip')), get_string('downloadall', 'assignment'));
1457                 echo html_writer::end_tag('div');
1458             }
1459             $table->print_html();  /// Print the whole table
1460         } else {
1461             if ($filter == self::FILTER_SUBMITTED) {
1462                 echo html_writer::tag('div', get_string('nosubmisson', 'assignment'), array('class'=>'nosubmisson'));
1463             } else if ($filter == self::FILTER_REQUIRE_GRADING) {
1464                 echo html_writer::tag('div', get_string('norequiregrading', 'assignment'), array('class'=>'norequiregrading'));
1465             }
1466         }
1467
1468         /// Print quickgrade form around the table
1469         if ($quickgrade && $table->started_output && !empty($users)){
1470             $mailinfopref = false;
1471             if (get_user_preferences('assignment_mailinfo', 1)) {
1472                 $mailinfopref = true;
1473             }
1474             $emailnotification =  html_writer::checkbox('mailinfo', 1, $mailinfopref, get_string('enablenotification','assignment'));
1475
1476             $emailnotification .= $OUTPUT->help_icon('enablenotification', 'assignment');
1477             echo html_writer::tag('div', $emailnotification, array('class'=>'emailnotification'));
1478
1479             $savefeedback = html_writer::empty_tag('input', array('type'=>'submit', 'name'=>'fastg', 'value'=>get_string('saveallfeedback', 'assignment')));
1480             echo html_writer::tag('div', $savefeedback, array('class'=>'fastgbutton'));
1481
1482             echo html_writer::end_tag('form');
1483         } else if ($quickgrade) {
1484             echo html_writer::end_tag('form');
1485         }
1486
1487         echo '</div>';
1488         /// End of fast grading form
1489
1490         /// Mini form for setting user preference
1491
1492         $formaction = new moodle_url('/mod/assignment/submissions.php', array('id'=>$this->cm->id));
1493         $mform = new MoodleQuickForm('optionspref', 'post', $formaction, '', array('class'=>'optionspref'));
1494
1495         $mform->addElement('hidden', 'updatepref');
1496         $mform->setDefault('updatepref', 1);
1497         $mform->addElement('header', 'qgprefs', get_string('optionalsettings', 'assignment'));
1498         $mform->addElement('select', 'filter', get_string('show'),  $filters);
1499
1500         $mform->setDefault('filter', $filter);
1501
1502         $mform->addElement('text', 'perpage', get_string('pagesize', 'assignment'), array('size'=>1));
1503         $mform->setDefault('perpage', $perpage);
1504
1505         $mform->addElement('checkbox', 'quickgrade', get_string('quickgrade','assignment'));
1506         $mform->setDefault('quickgrade', $quickgrade);
1507         $mform->addHelpButton('quickgrade', 'quickgrade', 'assignment');
1508
1509         $mform->addElement('submit', 'savepreferences', get_string('savepreferences'));
1510
1511         $mform->display();
1512
1513         echo $OUTPUT->footer();
1514     }
1515
1516     /**
1517      *  Process teacher feedback submission
1518      *
1519      * This is called by submissions() when a grading even has taken place.
1520      * It gets its data from the submitted form.
1521      *
1522      * @global object
1523      * @global object
1524      * @global object
1525      * @return object|bool The updated submission object or false
1526      */
1527     function process_feedback($formdata=null) {
1528         global $CFG, $USER, $DB;
1529         require_once($CFG->libdir.'/gradelib.php');
1530
1531         if (!$feedback = data_submitted() or !confirm_sesskey()) {      // No incoming data?
1532             return false;
1533         }
1534
1535         ///For save and next, we need to know the userid to save, and the userid to go
1536         ///We use a new hidden field in the form, and set it to -1. If it's set, we use this
1537         ///as the userid to store
1538         if ((int)$feedback->saveuserid !== -1){
1539             $feedback->userid = $feedback->saveuserid;
1540         }
1541
1542         if (!empty($feedback->cancel)) {          // User hit cancel button
1543             return false;
1544         }
1545
1546         $grading_info = grade_get_grades($this->course->id, 'mod', 'assignment', $this->assignment->id, $feedback->userid);
1547
1548         // store outcomes if needed
1549         $this->process_outcomes($feedback->userid);
1550
1551         $submission = $this->get_submission($feedback->userid, true);  // Get or make one
1552
1553         if (!($grading_info->items[0]->grades[$feedback->userid]->locked ||
1554             $grading_info->items[0]->grades[$feedback->userid]->overridden) ) {
1555
1556             $submission->grade      = $feedback->xgrade;
1557             $submission->submissioncomment    = $feedback->submissioncomment_editor['text'];
1558             $submission->teacher    = $USER->id;
1559             $mailinfo = get_user_preferences('assignment_mailinfo', 0);
1560             if (!$mailinfo) {
1561                 $submission->mailed = 1;       // treat as already mailed
1562             } else {
1563                 $submission->mailed = 0;       // Make sure mail goes out (again, even)
1564             }
1565             $submission->timemarked = time();
1566
1567             unset($submission->data1);  // Don't need to update this.
1568             unset($submission->data2);  // Don't need to update this.
1569
1570             if (empty($submission->timemodified)) {   // eg for offline assignments
1571                 // $submission->timemodified = time();
1572             }
1573
1574             $DB->update_record('assignment_submissions', $submission);
1575
1576             // triger grade event
1577             $this->update_grade($submission);
1578
1579             add_to_log($this->course->id, 'assignment', 'update grades',
1580                        'submissions.php?id='.$this->cm->id.'&user='.$feedback->userid, $feedback->userid, $this->cm->id);
1581              if (!is_null($formdata)) {
1582                     if ($this->type == 'upload' || $this->type == 'uploadsingle') {
1583                         $mformdata = $formdata->mform->get_data();
1584                         $mformdata = file_postupdate_standard_filemanager($mformdata, 'files', $formdata->fileui_options, $this->context, 'mod_assignment', 'response', $submission->id);
1585                     }
1586              }
1587         }
1588
1589         return $submission;
1590
1591     }
1592
1593     function process_outcomes($userid) {
1594         global $CFG, $USER;
1595
1596         if (empty($CFG->enableoutcomes)) {
1597             return;
1598         }
1599
1600         require_once($CFG->libdir.'/gradelib.php');
1601
1602         if (!$formdata = data_submitted() or !confirm_sesskey()) {
1603             return;
1604         }
1605
1606         $data = array();
1607         $grading_info = grade_get_grades($this->course->id, 'mod', 'assignment', $this->assignment->id, $userid);
1608
1609         if (!empty($grading_info->outcomes)) {
1610             foreach($grading_info->outcomes as $n=>$old) {
1611                 $name = 'outcome_'.$n;
1612                 if (isset($formdata->{$name}[$userid]) and $old->grades[$userid]->grade != $formdata->{$name}[$userid]) {
1613                     $data[$n] = $formdata->{$name}[$userid];
1614                 }
1615             }
1616         }
1617         if (count($data) > 0) {
1618             grade_update_outcomes('mod/assignment', $this->course->id, 'mod', 'assignment', $this->assignment->id, $userid, $data);
1619         }
1620
1621     }
1622
1623     /**
1624      * Load the submission object for a particular user
1625      *
1626      * @global object
1627      * @global object
1628      * @param $userid int The id of the user whose submission we want or 0 in which case USER->id is used
1629      * @param $createnew boolean optional Defaults to false. If set to true a new submission object will be created in the database
1630      * @param bool $teachermodified student submission set if false
1631      * @return object The submission
1632      */
1633     function get_submission($userid=0, $createnew=false, $teachermodified=false) {
1634         global $USER, $DB;
1635
1636         if (empty($userid)) {
1637             $userid = $USER->id;
1638         }
1639
1640         $submission = $DB->get_record('assignment_submissions', array('assignment'=>$this->assignment->id, 'userid'=>$userid));
1641
1642         if ($submission || !$createnew) {
1643             return $submission;
1644         }
1645         $newsubmission = $this->prepare_new_submission($userid, $teachermodified);
1646         $DB->insert_record("assignment_submissions", $newsubmission);
1647
1648         return $DB->get_record('assignment_submissions', array('assignment'=>$this->assignment->id, 'userid'=>$userid));
1649     }
1650
1651     /**
1652      * Instantiates a new submission object for a given user
1653      *
1654      * Sets the assignment, userid and times, everything else is set to default values.
1655      *
1656      * @param int $userid The userid for which we want a submission object
1657      * @param bool $teachermodified student submission set if false
1658      * @return object The submission
1659      */
1660     function prepare_new_submission($userid, $teachermodified=false) {
1661         $submission = new stdClass();
1662         $submission->assignment   = $this->assignment->id;
1663         $submission->userid       = $userid;
1664         $submission->timecreated = time();
1665         // teachers should not be modifying modified date, except offline assignments
1666         if ($teachermodified) {
1667             $submission->timemodified = 0;
1668         } else {
1669             $submission->timemodified = $submission->timecreated;
1670         }
1671         $submission->numfiles     = 0;
1672         $submission->data1        = '';
1673         $submission->data2        = '';
1674         $submission->grade        = -1;
1675         $submission->submissioncomment      = '';
1676         $submission->format       = 0;
1677         $submission->teacher      = 0;
1678         $submission->timemarked   = 0;
1679         $submission->mailed       = 0;
1680         return $submission;
1681     }
1682
1683     /**
1684      * Return all assignment submissions by ENROLLED students (even empty)
1685      *
1686      * @param string $sort optional field names for the ORDER BY in the sql query
1687      * @param string $dir optional specifying the sort direction, defaults to DESC
1688      * @return array The submission objects indexed by id
1689      */
1690     function get_submissions($sort='', $dir='DESC') {
1691         return assignment_get_all_submissions($this->assignment, $sort, $dir);
1692     }
1693
1694     /**
1695      * Counts all real assignment submissions by ENROLLED students (not empty ones)
1696      *
1697      * @param int $groupid optional If nonzero then count is restricted to this group
1698      * @return int The number of submissions
1699      */
1700     function count_real_submissions($groupid=0) {
1701         return assignment_count_real_submissions($this->cm, $groupid);
1702     }
1703
1704     /**
1705      * Alerts teachers by email of new or changed assignments that need grading
1706      *
1707      * First checks whether the option to email teachers is set for this assignment.
1708      * Sends an email to ALL teachers in the course (or in the group if using separate groups).
1709      * Uses the methods email_teachers_text() and email_teachers_html() to construct the content.
1710      *
1711      * @global object
1712      * @global object
1713      * @param $submission object The submission that has changed
1714      * @return void
1715      */
1716     function email_teachers($submission) {
1717         global $CFG, $DB;
1718
1719         if (empty($this->assignment->emailteachers)) {          // No need to do anything
1720             return;
1721         }
1722
1723         $user = $DB->get_record('user', array('id'=>$submission->userid));
1724
1725         if ($teachers = $this->get_graders($user)) {
1726
1727             $strassignments = get_string('modulenameplural', 'assignment');
1728             $strassignment  = get_string('modulename', 'assignment');
1729             $strsubmitted  = get_string('submitted', 'assignment');
1730
1731             foreach ($teachers as $teacher) {
1732                 $info = new stdClass();
1733                 $info->username = fullname($user, true);
1734                 $info->assignment = format_string($this->assignment->name,true);
1735                 $info->url = $CFG->wwwroot.'/mod/assignment/submissions.php?id='.$this->cm->id;
1736                 $info->timeupdated = strftime('%c',$submission->timemodified);
1737
1738                 $postsubject = $strsubmitted.': '.$info->username.' -> '.$this->assignment->name;
1739                 $posttext = $this->email_teachers_text($info);
1740                 $posthtml = ($teacher->mailformat == 1) ? $this->email_teachers_html($info) : '';
1741
1742                 $eventdata = new stdClass();
1743                 $eventdata->modulename       = 'assignment';
1744                 $eventdata->userfrom         = $user;
1745                 $eventdata->userto           = $teacher;
1746                 $eventdata->subject          = $postsubject;
1747                 $eventdata->fullmessage      = $posttext;
1748                 $eventdata->fullmessageformat = FORMAT_PLAIN;
1749                 $eventdata->fullmessagehtml  = $posthtml;
1750                 $eventdata->smallmessage     = $postsubject;
1751
1752                 $eventdata->name            = 'assignment_updates';
1753                 $eventdata->component       = 'mod_assignment';
1754                 $eventdata->notification    = 1;
1755                 $eventdata->contexturl      = $info->url;
1756                 $eventdata->contexturlname  = $info->assignment;
1757
1758                 message_send($eventdata);
1759             }
1760         }
1761     }
1762
1763     /**
1764      * @param string $filearea
1765      * @param array $args
1766      * @return bool
1767      */
1768     function send_file($filearea, $args) {
1769         debugging('plugin does not implement file sending', DEBUG_DEVELOPER);
1770         return false;
1771     }
1772
1773     /**
1774      * Returns a list of teachers that should be grading given submission
1775      *
1776      * @param object $user
1777      * @return array
1778      */
1779     function get_graders($user) {
1780         //potential graders
1781         $potgraders = get_users_by_capability($this->context, 'mod/assignment:grade', '', '', '', '', '', '', false, false);
1782
1783         $graders = array();
1784         if (groups_get_activity_groupmode($this->cm) == SEPARATEGROUPS) {   // Separate groups are being used
1785             if ($groups = groups_get_all_groups($this->course->id, $user->id)) {  // Try to find all groups
1786                 foreach ($groups as $group) {
1787                     foreach ($potgraders as $t) {
1788                         if ($t->id == $user->id) {
1789                             continue; // do not send self
1790                         }
1791                         if (groups_is_member($group->id, $t->id)) {
1792                             $graders[$t->id] = $t;
1793                         }
1794                     }
1795                 }
1796             } else {
1797                 // user not in group, try to find graders without group
1798                 foreach ($potgraders as $t) {
1799                     if ($t->id == $user->id) {
1800                         continue; // do not send self
1801                     }
1802                     if (!groups_get_all_groups($this->course->id, $t->id)) { //ugly hack
1803                         $graders[$t->id] = $t;
1804                     }
1805                 }
1806             }
1807         } else {
1808             foreach ($potgraders as $t) {
1809                 if ($t->id == $user->id) {
1810                     continue; // do not send self
1811                 }
1812                 $graders[$t->id] = $t;
1813             }
1814         }
1815         return $graders;
1816     }
1817
1818     /**
1819      * Creates the text content for emails to teachers
1820      *
1821      * @param $info object The info used by the 'emailteachermail' language string
1822      * @return string
1823      */
1824     function email_teachers_text($info) {
1825         $posttext  = format_string($this->course->shortname).' -> '.$this->strassignments.' -> '.
1826                      format_string($this->assignment->name)."\n";
1827         $posttext .= '---------------------------------------------------------------------'."\n";
1828         $posttext .= get_string("emailteachermail", "assignment", $info)."\n";
1829         $posttext .= "\n---------------------------------------------------------------------\n";
1830         return $posttext;
1831     }
1832
1833      /**
1834      * Creates the html content for emails to teachers
1835      *
1836      * @param $info object The info used by the 'emailteachermailhtml' language string
1837      * @return string
1838      */
1839     function email_teachers_html($info) {
1840         global $CFG;
1841         $posthtml  = '<p><font face="sans-serif">'.
1842                      '<a href="'.$CFG->wwwroot.'/course/view.php?id='.$this->course->id.'">'.format_string($this->course->shortname).'</a> ->'.
1843                      '<a href="'.$CFG->wwwroot.'/mod/assignment/index.php?id='.$this->course->id.'">'.$this->strassignments.'</a> ->'.
1844                      '<a href="'.$CFG->wwwroot.'/mod/assignment/view.php?id='.$this->cm->id.'">'.format_string($this->assignment->name).'</a></font></p>';
1845         $posthtml .= '<hr /><font face="sans-serif">';
1846         $posthtml .= '<p>'.get_string('emailteachermailhtml', 'assignment', $info).'</p>';
1847         $posthtml .= '</font><hr />';
1848         return $posthtml;
1849     }
1850
1851     /**
1852      * Produces a list of links to the files uploaded by a user
1853      *
1854      * @param $userid int optional id of the user. If 0 then $USER->id is used.
1855      * @param $return boolean optional defaults to false. If true the list is returned rather than printed
1856      * @return string optional
1857      */
1858     function print_user_files($userid=0, $return=false) {
1859         global $CFG, $USER, $OUTPUT;
1860
1861         if (!$userid) {
1862             if (!isloggedin()) {
1863                 return '';
1864             }
1865             $userid = $USER->id;
1866         }
1867
1868         $output = '';
1869
1870         $submission = $this->get_submission($userid);
1871         if (!$submission) {
1872             return $output;
1873         }
1874
1875         $fs = get_file_storage();
1876         $files = $fs->get_area_files($this->context->id, 'mod_assignment', 'submission', $submission->id, "timemodified", false);
1877         if (!empty($files)) {
1878             require_once($CFG->dirroot . '/mod/assignment/locallib.php');
1879             if ($CFG->enableportfolios) {
1880                 require_once($CFG->libdir.'/portfoliolib.php');
1881                 $button = new portfolio_add_button();
1882             }
1883             foreach ($files as $file) {
1884                 $filename = $file->get_filename();
1885                 $mimetype = $file->get_mimetype();
1886                 $path = file_encode_url($CFG->wwwroot.'/pluginfile.php', '/'.$this->context->id.'/mod_assignment/submission/'.$submission->id.'/'.$filename);
1887                 $output .= '<a href="'.$path.'" ><img src="'.$OUTPUT->pix_url(file_mimetype_icon($mimetype)).'" class="icon" alt="'.$mimetype.'" />'.s($filename).'</a>';
1888                 if ($CFG->enableportfolios && $this->portfolio_exportable() && has_capability('mod/assignment:exportownsubmission', $this->context)) {
1889                     $button->set_callback_options('assignment_portfolio_caller', array('id' => $this->cm->id, 'fileid' => $file->get_id()), '/mod/assignment/locallib.php');
1890                     $button->set_format_by_file($file);
1891                     $output .= $button->to_html(PORTFOLIO_ADD_ICON_LINK);
1892                 }
1893                 $output .= plagiarism_get_links(array('userid'=>$userid, 'file'=>$file, 'cmid'=>$this->cm->id, 'course'=>$this->course, 'assignment'=>$this->assignment));
1894                 $output .= '<br />';
1895             }
1896             if ($CFG->enableportfolios && count($files) > 1  && $this->portfolio_exportable() && has_capability('mod/assignment:exportownsubmission', $this->context)) {
1897                 $button->set_callback_options('assignment_portfolio_caller', array('id' => $this->cm->id), '/mod/assignment/locallib.php');
1898                 $output .= '<br />'  . $button->to_html();
1899             }
1900         }
1901
1902         $output = '<div class="files">'.$output.'</div>';
1903
1904         if ($return) {
1905             return $output;
1906         }
1907         echo $output;
1908     }
1909
1910     /**
1911      * Count the files uploaded by a given user
1912      *
1913      * @param $itemid int The submission's id as the file's itemid.
1914      * @return int
1915      */
1916     function count_user_files($itemid) {
1917         $fs = get_file_storage();
1918         $files = $fs->get_area_files($this->context->id, 'mod_assignment', 'submission', $itemid, "id", false);
1919         return count($files);
1920     }
1921
1922     /**
1923      * Returns true if the student is allowed to submit
1924      *
1925      * Checks that the assignment has started and, if the option to prevent late
1926      * submissions is set, also checks that the assignment has not yet closed.
1927      * @return boolean
1928      */
1929     function isopen() {
1930         $time = time();
1931         if ($this->assignment->preventlate && $this->assignment->timedue) {
1932             return ($this->assignment->timeavailable <= $time && $time <= $this->assignment->timedue);
1933         } else {
1934             return ($this->assignment->timeavailable <= $time);
1935         }
1936     }
1937
1938
1939     /**
1940      * Return true if is set description is hidden till available date
1941      *
1942      * This is needed by calendar so that hidden descriptions do not
1943      * come up in upcoming events.
1944      *
1945      * Check that description is hidden till available date
1946      * By default return false
1947      * Assignments types should implement this method if needed
1948      * @return boolen
1949      */
1950     function description_is_hidden() {
1951         return false;
1952     }
1953
1954     /**
1955      * Return an outline of the user's interaction with the assignment
1956      *
1957      * The default method prints the grade and timemodified
1958      * @param $grade object
1959      * @return object with properties ->info and ->time
1960      */
1961     function user_outline($grade) {
1962
1963         $result = new stdClass();
1964         $result->info = get_string('grade').': '.$grade->str_long_grade;
1965         $result->time = $grade->dategraded;
1966         return $result;
1967     }
1968
1969     /**
1970      * Print complete information about the user's interaction with the assignment
1971      *
1972      * @param $user object
1973      */
1974     function user_complete($user, $grade=null) {
1975         global $OUTPUT;
1976         if ($grade) {
1977             echo $OUTPUT->container(get_string('grade').': '.$grade->str_long_grade);
1978             if ($grade->str_feedback) {
1979                 echo $OUTPUT->container(get_string('feedback').': '.$grade->str_feedback);
1980             }
1981         }
1982
1983         if ($submission = $this->get_submission($user->id)) {
1984
1985             $fs = get_file_storage();
1986
1987             if ($files = $fs->get_area_files($this->context->id, 'mod_assignment', 'submission', $submission->id, "timemodified", false)) {
1988                 $countfiles = count($files)." ".get_string("uploadedfiles", "assignment");
1989                 foreach ($files as $file) {
1990                     $countfiles .= "; ".$file->get_filename();
1991                 }
1992             }
1993
1994             echo $OUTPUT->box_start();
1995             echo get_string("lastmodified").": ";
1996             echo userdate($submission->timemodified);
1997             echo $this->display_lateness($submission->timemodified);
1998
1999             $this->print_user_files($user->id);
2000
2001             echo '<br />';
2002
2003             $this->view_feedback($submission);
2004
2005             echo $OUTPUT->box_end();
2006
2007         } else {
2008             print_string("notsubmittedyet", "assignment");
2009         }
2010     }
2011
2012     /**
2013      * Return a string indicating how late a submission is
2014      *
2015      * @param $timesubmitted int
2016      * @return string
2017      */
2018     function display_lateness($timesubmitted) {
2019         return assignment_display_lateness($timesubmitted, $this->assignment->timedue);
2020     }
2021
2022     /**
2023      * Empty method stub for all delete actions.
2024      */
2025     function delete() {
2026         //nothing by default
2027         redirect('view.php?id='.$this->cm->id);
2028     }
2029
2030     /**
2031      * Empty custom feedback grading form.
2032      */
2033     function custom_feedbackform($submission, $return=false) {
2034         //nothing by default
2035         return '';
2036     }
2037
2038     /**
2039      * Add a get_coursemodule_info function in case any assignment type wants to add 'extra' information
2040      * for the course (see resource).
2041      *
2042      * Given a course_module object, this function returns any "extra" information that may be needed
2043      * when printing this activity in a course listing.  See get_array_of_activities() in course/lib.php.
2044      *
2045      * @param $coursemodule object The coursemodule object (record).
2046      * @return object An object on information that the courses will know about (most noticeably, an icon).
2047      *
2048      */
2049     function get_coursemodule_info($coursemodule) {
2050         return false;
2051     }
2052
2053     /**
2054      * Plugin cron method - do not use $this here, create new assignment instances if needed.
2055      * @return void
2056      */
2057     function cron() {
2058         //no plugin cron by default - override if needed
2059     }
2060
2061     /**
2062      * Reset all submissions
2063      */
2064     function reset_userdata($data) {
2065         global $CFG, $DB;
2066
2067         if (!$DB->count_records('assignment', array('course'=>$data->courseid, 'assignmenttype'=>$this->type))) {
2068             return array(); // no assignments of this type present
2069         }
2070
2071         $componentstr = get_string('modulenameplural', 'assignment');
2072         $status = array();
2073
2074         $typestr = get_string('type'.$this->type, 'assignment');
2075         // ugly hack to support pluggable assignment type titles...
2076         if($typestr === '[[type'.$this->type.']]'){
2077             $typestr = get_string('type'.$this->type, 'assignment_'.$this->type);
2078         }
2079
2080         if (!empty($data->reset_assignment_submissions)) {
2081             $assignmentssql = "SELECT a.id
2082                                  FROM {assignment} a
2083                                 WHERE a.course=? AND a.assignmenttype=?";
2084             $params = array($data->courseid, $this->type);
2085
2086             // now get rid of all submissions and responses
2087             $fs = get_file_storage();
2088             if ($assignments = $DB->get_records_sql($assignmentssql, $params)) {
2089                 foreach ($assignments as $assignmentid=>$unused) {
2090                     if (!$cm = get_coursemodule_from_instance('assignment', $assignmentid)) {
2091                         continue;
2092                     }
2093                     $context = get_context_instance(CONTEXT_MODULE, $cm->id);
2094                     $fs->delete_area_files($context->id, 'mod_assignment', 'submission');
2095                     $fs->delete_area_files($context->id, 'mod_assignment', 'response');
2096                 }
2097             }
2098
2099             $DB->delete_records_select('assignment_submissions', "assignment IN ($assignmentssql)", $params);
2100
2101             $status[] = array('component'=>$componentstr, 'item'=>get_string('deleteallsubmissions','assignment').': '.$typestr, 'error'=>false);
2102
2103             if (empty($data->reset_gradebook_grades)) {
2104                 // remove all grades from gradebook
2105                 assignment_reset_gradebook($data->courseid, $this->type);
2106             }
2107         }
2108
2109         /// updating dates - shift may be negative too
2110         if ($data->timeshift) {
2111             shift_course_mod_dates('assignment', array('timedue', 'timeavailable'), $data->timeshift, $data->courseid);
2112             $status[] = array('component'=>$componentstr, 'item'=>get_string('datechanged').': '.$typestr, 'error'=>false);
2113         }
2114
2115         return $status;
2116     }
2117
2118
2119     function portfolio_exportable() {
2120         return false;
2121     }
2122
2123     /**
2124      * base implementation for backing up subtype specific information
2125      * for one single module
2126      *
2127      * @param filehandle $bf file handle for xml file to write to
2128      * @param mixed $preferences the complete backup preference object
2129      *
2130      * @return boolean
2131      *
2132      * @static
2133      */
2134     static function backup_one_mod($bf, $preferences, $assignment) {
2135         return true;
2136     }
2137
2138     /**
2139      * base implementation for backing up subtype specific information
2140      * for one single submission
2141      *
2142      * @param filehandle $bf file handle for xml file to write to
2143      * @param mixed $preferences the complete backup preference object
2144      * @param object $submission the assignment submission db record
2145      *
2146      * @return boolean
2147      *
2148      * @static
2149      */
2150     static function backup_one_submission($bf, $preferences, $assignment, $submission) {
2151         return true;
2152     }
2153
2154     /**
2155      * base implementation for restoring subtype specific information
2156      * for one single module
2157      *
2158      * @param array  $info the array representing the xml
2159      * @param object $restore the restore preferences
2160      *
2161      * @return boolean
2162      *
2163      * @static
2164      */
2165     static function restore_one_mod($info, $restore, $assignment) {
2166         return true;
2167     }
2168
2169     /**
2170      * base implementation for restoring subtype specific information
2171      * for one single submission
2172      *
2173      * @param object $submission the newly created submission
2174      * @param array  $info the array representing the xml
2175      * @param object $restore the restore preferences
2176      *
2177      * @return boolean
2178      *
2179      * @static
2180      */
2181     static function restore_one_submission($info, $restore, $assignment, $submission) {
2182         return true;
2183     }
2184
2185 } ////// End of the assignment_base class
2186
2187
2188 class mod_assignment_grading_form extends moodleform {
2189
2190     function definition() {
2191         global $OUTPUT;
2192         $mform =& $this->_form;
2193
2194         $formattr = $mform->getAttributes();
2195         $formattr['id'] = 'submitform';
2196         $mform->setAttributes($formattr);
2197         // hidden params
2198         $mform->addElement('hidden', 'offset', ($this->_customdata->offset+1));
2199         $mform->setType('offset', PARAM_INT);
2200         $mform->addElement('hidden', 'userid', $this->_customdata->userid);
2201         $mform->setType('userid', PARAM_INT);
2202         $mform->addElement('hidden', 'nextid', $this->_customdata->nextid);
2203         $mform->setType('nextid', PARAM_INT);
2204         $mform->addElement('hidden', 'id', $this->_customdata->cm->id);
2205         $mform->setType('id', PARAM_INT);
2206         $mform->addElement('hidden', 'sesskey', sesskey());
2207         $mform->setType('sesskey', PARAM_ALPHANUM);
2208         $mform->addElement('hidden', 'mode', 'grade');
2209         $mform->setType('mode', PARAM_TEXT);
2210         $mform->addElement('hidden', 'menuindex', "0");
2211         $mform->setType('menuindex', PARAM_INT);
2212         $mform->addElement('hidden', 'saveuserid', "-1");
2213         $mform->setType('saveuserid', PARAM_INT);
2214         $mform->addElement('hidden', 'filter', "0");
2215         $mform->setType('filter', PARAM_INT);
2216
2217         $mform->addElement('static', 'picture', $OUTPUT->user_picture($this->_customdata->user),
2218                                                 fullname($this->_customdata->user, true) . '<br/>' .
2219                                                 userdate($this->_customdata->submission->timemodified) .
2220                                                 $this->_customdata->lateness );
2221
2222         $this->add_submission_content();
2223         $this->add_grades_section();
2224
2225         $this->add_feedback_section();
2226
2227         if ($this->_customdata->submission->timemarked) {
2228             $datestring = userdate($this->_customdata->submission->timemarked)."&nbsp; (".format_time(time() - $this->_customdata->submission->timemarked).")";
2229             $mform->addElement('header', 'Last Grade', get_string('lastgrade', 'assignment'));
2230             $mform->addElement('static', 'picture', $OUTPUT->user_picture($this->_customdata->teacher) ,
2231                                                     fullname($this->_customdata->teacher,true).
2232                                                     '<br/>'.$datestring);
2233         }
2234         // buttons
2235         $this->add_action_buttons();
2236
2237     }
2238
2239     function add_grades_section() {
2240         global $CFG;
2241         $mform =& $this->_form;
2242         $attributes = array();
2243         if ($this->_customdata->gradingdisabled) {
2244             $attributes['disabled'] ='disabled';
2245         }
2246
2247         $grademenu = make_grades_menu($this->_customdata->assignment->grade);
2248         $grademenu['-1'] = get_string('nograde');
2249
2250         $mform->addElement('header', 'Grades', get_string('grades', 'grades'));
2251         $mform->addElement('select', 'xgrade', get_string('grade').':', $grademenu, $attributes);
2252         $mform->setDefault('xgrade', $this->_customdata->submission->grade ); //@fixme some bug when element called 'grade' makes it break
2253         $mform->setType('xgrade', PARAM_INT);
2254
2255         if (!empty($this->_customdata->enableoutcomes)) {
2256             foreach($this->_customdata->grading_info->outcomes as $n=>$outcome) {
2257                 $options = make_grades_menu(-$outcome->scaleid);
2258                 if ($outcome->grades[$this->_customdata->submission->userid]->locked) {
2259                     $options[0] = get_string('nooutcome', 'grades');
2260                     echo $options[$outcome->grades[$this->_customdata->submission->userid]->grade];
2261                 } else {
2262                     $options[''] = get_string('nooutcome', 'grades');
2263                     $attributes = array('id' => 'menuoutcome_'.$n );
2264                     $mform->addElement('select', 'outcome_'.$n.'['.$this->_customdata->userid.']', $outcome->name.':', $options, $attributes );
2265                     $mform->setType('outcome_'.$n.'['.$this->_customdata->userid.']', PARAM_INT);
2266                     $mform->setDefault('outcome_'.$n.'['.$this->_customdata->userid.']', $outcome->grades[$this->_customdata->submission->userid]->grade );
2267                 }
2268             }
2269         }
2270         $course_context = get_context_instance(CONTEXT_MODULE , $this->_customdata->cm->id);
2271         if (has_capability('gradereport/grader:view', $course_context) && has_capability('moodle/grade:viewall', $course_context)) {
2272             $grade = '<a href="'.$CFG->wwwroot.'/grade/report/grader/index.php?id='. $this->_customdata->courseid .'" >'.
2273                         $this->_customdata->grading_info->items[0]->grades[$this->_customdata->userid]->str_grade . '</a>';
2274         }else{
2275             $grade = $this->_customdata->grading_info->items[0]->grades[$this->_customdata->userid]->str_grade;
2276         }
2277         $mform->addElement('static', 'finalgrade', get_string('currentgrade', 'assignment').':' ,$grade);
2278         $mform->setType('finalgrade', PARAM_INT);
2279     }
2280
2281     /**
2282      *
2283      * @global core_renderer $OUTPUT
2284      */
2285     function add_feedback_section() {
2286         global $OUTPUT;
2287         $mform =& $this->_form;
2288         $mform->addElement('header', 'Feed Back', get_string('feedback', 'grades'));
2289
2290         if ($this->_customdata->gradingdisabled) {
2291             $mform->addElement('static', 'disabledfeedback', $this->_customdata->grading_info->items[0]->grades[$this->_customdata->userid]->str_feedback );
2292         } else {
2293             // visible elements
2294
2295             $mform->addElement('editor', 'submissioncomment_editor', get_string('feedback', 'assignment').':', null, $this->get_editor_options() );
2296             $mform->setType('submissioncomment_editor', PARAM_RAW); // to be cleaned before display
2297             $mform->setDefault('submissioncomment_editor', $this->_customdata->submission->submissioncomment);
2298             //$mform->addRule('submissioncomment', get_string('required'), 'required', null, 'client');
2299             switch ($this->_customdata->assignment->assignmenttype) {
2300                 case 'upload' :
2301                 case 'uploadsingle' :
2302                     $mform->addElement('filemanager', 'files_filemanager', get_string('responsefiles', 'assignment'). ':', null, $this->_customdata->fileui_options);
2303                     break;
2304                 default :
2305                     break;
2306             }
2307             $mform->addElement('hidden', 'mailinfo_h', "0");
2308             $mform->setType('mailinfo_h', PARAM_INT);
2309             $mform->addElement('checkbox', 'mailinfo',get_string('enablenotification','assignment').
2310             $OUTPUT->help_icon('enablenotification', 'assignment') .':' );
2311             $mform->setType('mailinfo', PARAM_INT);
2312         }
2313     }
2314
2315     function add_action_buttons() {
2316         $mform =& $this->_form;
2317         //if there are more to be graded.
2318         if ($this->_customdata->nextid>0) {
2319             $buttonarray=array();
2320             $buttonarray[] = &$mform->createElement('submit', 'submitbutton', get_string('savechanges'));
2321             //@todo: fix accessibility: javascript dependency not necessary
2322             $buttonarray[] = &$mform->createElement('submit', 'saveandnext', get_string('saveandnext'));
2323             $buttonarray[] = &$mform->createElement('submit', 'next', get_string('next'));
2324             $buttonarray[] = &$mform->createElement('cancel');
2325         } else {
2326             $buttonarray=array();
2327             $buttonarray[] = &$mform->createElement('submit', 'submitbutton', get_string('savechanges'));
2328             $buttonarray[] = &$mform->createElement('cancel');
2329         }
2330         $mform->addGroup($buttonarray, 'grading_buttonar', '', array(' '), false);
2331         $mform->closeHeaderBefore('grading_buttonar');
2332         $mform->setType('grading_buttonar', PARAM_RAW);
2333     }
2334
2335     function add_submission_content() {
2336         $mform =& $this->_form;
2337         $mform->addElement('header', 'Submission', get_string('submission', 'assignment'));
2338         $mform->addElement('static', '', '' , $this->_customdata->submission_content );
2339     }
2340
2341     protected function get_editor_options() {
2342         $editoroptions = array();
2343         $editoroptions['component'] = 'mod_assignment';
2344         $editoroptions['filearea'] = 'feedback';
2345         $editoroptions['noclean'] = false;
2346         $editoroptions['maxfiles'] = 0; //TODO: no files for now, we need to first implement assignment_feedback area, integration with gradebook, files support in quickgrading, etc. (skodak)
2347         $editoroptions['maxbytes'] = $this->_customdata->maxbytes;
2348         return $editoroptions;
2349     }
2350
2351     public function set_data($data) {
2352         $editoroptions = $this->get_editor_options();
2353         if (!isset($data->text)) {
2354             $data->text = '';
2355         }
2356         if (!isset($data->format)) {
2357             $data->textformat = FORMAT_HTML;
2358         } else {
2359             $data->textformat = $data->format;
2360         }
2361
2362         if (!empty($this->_customdata->submission->id)) {
2363             $itemid = $this->_customdata->submission->id;
2364         } else {
2365             $itemid = null;
2366         }
2367
2368         switch ($this->_customdata->assignment->assignmenttype) {
2369                 case 'upload' :
2370                 case 'uploadsingle' :
2371                     $data = file_prepare_standard_filemanager($data, 'files', $editoroptions, $this->_customdata->context, 'mod_assignment', 'response', $itemid);
2372                     break;
2373                 default :
2374                     break;
2375         }
2376
2377         $data = file_prepare_standard_editor($data, 'submissioncomment', $editoroptions, $this->_customdata->context, $editoroptions['component'], $editoroptions['filearea'], $itemid);
2378         return parent::set_data($data);
2379     }
2380
2381     public function get_data() {
2382         $data = parent::get_data();
2383
2384         if (!empty($this->_customdata->submission->id)) {
2385             $itemid = $this->_customdata->submission->id;
2386         } else {
2387             $itemid = null; //TODO: this is wrong, itemid MUST be known when saving files!! (skodak)
2388         }
2389
2390         if ($data) {
2391             $editoroptions = $this->get_editor_options();
2392             switch ($this->_customdata->assignment->assignmenttype) {
2393                 case 'upload' :
2394                 case 'uploadsingle' :
2395                     $data = file_postupdate_standard_filemanager($data, 'files', $editoroptions, $this->_customdata->context, 'mod_assignment', 'response', $itemid);
2396                     break;
2397                 default :
2398                     break;
2399             }
2400             $data = file_postupdate_standard_editor($data, 'submissioncomment', $editoroptions, $this->_customdata->context, $editoroptions['component'], $editoroptions['filearea'], $itemid);
2401         }
2402         return $data;
2403     }
2404 }
2405
2406 /// OTHER STANDARD FUNCTIONS ////////////////////////////////////////////////////////
2407
2408 /**
2409  * Deletes an assignment instance
2410  *
2411  * This is done by calling the delete_instance() method of the assignment type class
2412  */
2413 function assignment_delete_instance($id){
2414     global $CFG, $DB;
2415
2416     if (! $assignment = $DB->get_record('assignment', array('id'=>$id))) {
2417         return false;
2418     }
2419
2420     // fall back to base class if plugin missing
2421     $classfile = "$CFG->dirroot/mod/assignment/type/$assignment->assignmenttype/assignment.class.php";
2422     if (file_exists($classfile)) {
2423         require_once($classfile);
2424         $assignmentclass = "assignment_$assignment->assignmenttype";
2425
2426     } else {
2427         debugging("Missing assignment plug-in: {$assignment->assignmenttype}. Using base class for deleting instead.");
2428         $assignmentclass = "assignment_base";
2429     }
2430
2431     $ass = new $assignmentclass();
2432     return $ass->delete_instance($assignment);
2433 }
2434
2435
2436 /**
2437  * Updates an assignment instance
2438  *
2439  * This is done by calling the update_instance() method of the assignment type class
2440  */
2441 function assignment_update_instance($assignment){
2442     global $CFG;
2443
2444     $assignment->assignmenttype = clean_param($assignment->assignmenttype, PARAM_SAFEDIR);
2445
2446     require_once("$CFG->dirroot/mod/assignment/type/$assignment->assignmenttype/assignment.class.php");
2447     $assignmentclass = "assignment_$assignment->assignmenttype";
2448     $ass = new $assignmentclass();
2449     return $ass->update_instance($assignment);
2450 }
2451
2452
2453 /**
2454  * Adds an assignment instance
2455  *
2456  * This is done by calling the add_instance() method of the assignment type class
2457  */
2458 function assignment_add_instance($assignment) {
2459     global $CFG;
2460
2461     $assignment->assignmenttype = clean_param($assignment->assignmenttype, PARAM_SAFEDIR);
2462
2463     require_once("$CFG->dirroot/mod/assignment/type/$assignment->assignmenttype/assignment.class.php");
2464     $assignmentclass = "assignment_$assignment->assignmenttype";
2465     $ass = new $assignmentclass();
2466     return $ass->add_instance($assignment);
2467 }
2468
2469
2470 /**
2471  * Returns an outline of a user interaction with an assignment
2472  *
2473  * This is done by calling the user_outline() method of the assignment type class
2474  */
2475 function assignment_user_outline($course, $user, $mod, $assignment) {
2476     global $CFG;
2477
2478     require_once("$CFG->libdir/gradelib.php");
2479     require_once("$CFG->dirroot/mod/assignment/type/$assignment->assignmenttype/assignment.class.php");
2480     $assignmentclass = "assignment_$assignment->assignmenttype";
2481     $ass = new $assignmentclass($mod->id, $assignment, $mod, $course);
2482     $grades = grade_get_grades($course->id, 'mod', 'assignment', $assignment->id, $user->id);
2483     if (!empty($grades->items[0]->grades)) {
2484         return $ass->user_outline(reset($grades->items[0]->grades));
2485     } else {
2486         return null;
2487     }
2488 }
2489
2490 /**
2491  * Prints the complete info about a user's interaction with an assignment
2492  *
2493  * This is done by calling the user_complete() method of the assignment type class
2494  */
2495 function assignment_user_complete($course, $user, $mod, $assignment) {
2496     global $CFG;
2497
2498     require_once("$CFG->libdir/gradelib.php");
2499     require_once("$CFG->dirroot/mod/assignment/type/$assignment->assignmenttype/assignment.class.php");
2500     $assignmentclass = "assignment_$assignment->assignmenttype";
2501     $ass = new $assignmentclass($mod->id, $assignment, $mod, $course);
2502     $grades = grade_get_grades($course->id, 'mod', 'assignment', $assignment->id, $user->id);
2503     if (empty($grades->items[0]->grades)) {
2504         $grade = false;
2505     } else {
2506         $grade = reset($grades->items[0]->grades);
2507     }
2508     return $ass->user_complete($user, $grade);
2509 }
2510
2511 /**
2512  * Function to be run periodically according to the moodle cron
2513  *
2514  * Finds all assignment notifications that have yet to be mailed out, and mails them
2515  */
2516 function assignment_cron () {
2517     global $CFG, $USER, $DB;
2518
2519     /// first execute all crons in plugins
2520     if ($plugins = get_plugin_list('assignment')) {
2521         foreach ($plugins as $plugin=>$dir) {
2522             require_once("$dir/assignment.class.php");
2523             $assignmentclass = "assignment_$plugin";
2524             $ass = new $assignmentclass();
2525             $ass->cron();
2526         }
2527     }
2528
2529     /// Notices older than 1 day will not be mailed.  This is to avoid the problem where
2530     /// cron has not been running for a long time, and then suddenly people are flooded
2531     /// with mail from the past few weeks or months
2532
2533     $timenow   = time();
2534     $endtime   = $timenow - $CFG->maxeditingtime;
2535     $starttime = $endtime - 24 * 3600;   /// One day earlier
2536
2537     if ($submissions = assignment_get_unmailed_submissions($starttime, $endtime)) {
2538
2539         $realuser = clone($USER);
2540
2541         foreach ($submissions as $key => $submission) {
2542             $DB->set_field("assignment_submissions", "mailed", "1", array("id"=>$submission->id));
2543         }
2544
2545         $timenow = time();
2546
2547         foreach ($submissions as $submission) {
2548
2549             echo "Processing assignment submission $submission->id\n";
2550
2551             if (! $user = $DB->get_record("user", array("id"=>$submission->userid))) {
2552                 echo "Could not find user $user->id\n";
2553                 continue;
2554             }
2555
2556             if (! $course = $DB->get_record("course", array("id"=>$submission->course))) {
2557                 echo "Could not find course $submission->course\n";
2558                 continue;
2559             }
2560
2561             /// Override the language and timezone of the "current" user, so that
2562             /// mail is customised for the receiver.
2563             cron_setup_user($user, $course);
2564
2565             if (!is_enrolled(get_context_instance(CONTEXT_COURSE, $submission->course), $user->id)) {
2566                 echo fullname($user)." not an active participant in " . format_string($course->shortname) . "\n";
2567                 continue;
2568             }
2569
2570             if (! $teacher = $DB->get_record("user", array("id"=>$submission->teacher))) {
2571                 echo "Could not find teacher $submission->teacher\n";
2572                 continue;
2573             }
2574
2575             if (! $mod = get_coursemodule_from_instance("assignment", $submission->assignment, $course->id)) {
2576                 echo "Could not find course module for assignment id $submission->assignment\n";
2577                 continue;
2578             }
2579
2580             if (! $mod->visible) {    /// Hold mail notification for hidden assignments until later
2581                 continue;
2582             }
2583
2584             $strassignments = get_string("modulenameplural", "assignment");
2585             $strassignment  = get_string("modulename", "assignment");
2586
2587             $assignmentinfo = new stdClass();
2588             $assignmentinfo->teacher = fullname($teacher);
2589             $assignmentinfo->assignment = format_string($submission->name,true);
2590             $assignmentinfo->url = "$CFG->wwwroot/mod/assignment/view.php?id=$mod->id";
2591
2592             $postsubject = "$course->shortname: $strassignments: ".format_string($submission->name,true);
2593             $posttext  = "$course->shortname -> $strassignments -> ".format_string($submission->name,true)."\n";
2594             $posttext .= "---------------------------------------------------------------------\n";
2595             $posttext .= get_string("assignmentmail", "assignment", $assignmentinfo)."\n";
2596             $posttext .= "---------------------------------------------------------------------\n";
2597
2598             if ($user->mailformat == 1) {  // HTML
2599                 $posthtml = "<p><font face=\"sans-serif\">".
2600                 "<a href=\"$CFG->wwwroot/course/view.php?id=$course->id\">$course->shortname</a> ->".
2601                 "<a href=\"$CFG->wwwroot/mod/assignment/index.php?id=$course->id\">$strassignments</a> ->".
2602                 "<a href=\"$CFG->wwwroot/mod/assignment/view.php?id=$mod->id\">".format_string($submission->name,true)."</a></font></p>";
2603                 $posthtml .= "<hr /><font face=\"sans-serif\">";
2604                 $posthtml .= "<p>".get_string("assignmentmailhtml", "assignment", $assignmentinfo)."</p>";
2605                 $posthtml .= "</font><hr />";
2606             } else {
2607                 $posthtml = "";
2608             }
2609
2610             $eventdata = new stdClass();
2611             $eventdata->modulename       = 'assignment';
2612             $eventdata->userfrom         = $teacher;
2613             $eventdata->userto           = $user;
2614             $eventdata->subject          = $postsubject;
2615             $eventdata->fullmessage      = $posttext;
2616             $eventdata->fullmessageformat = FORMAT_PLAIN;
2617             $eventdata->fullmessagehtml  = $posthtml;
2618             $eventdata->smallmessage     = get_string('assignmentmailsmall', 'assignment', $assignmentinfo);
2619
2620             $eventdata->name            = 'assignment_updates';
2621             $eventdata->component       = 'mod_assignment';
2622             $eventdata->notification    = 1;
2623             $eventdata->contexturl      = $assignmentinfo->url;
2624             $eventdata->contexturlname  = $assignmentinfo->assignment;
2625
2626             message_send($eventdata);
2627         }
2628
2629         cron_setup_user();
2630     }
2631
2632     return true;
2633 }
2634
2635 /**
2636  * Return grade for given user or all users.
2637  *
2638  * @param int $assignmentid id of assignment
2639  * @param int $userid optional user id, 0 means all users
2640  * @return array array of grades, false if none
2641  */
2642 function assignment_get_user_grades($assignment, $userid=0) {
2643     global $CFG, $DB;
2644
2645     if ($userid) {
2646         $user = "AND u.id = :userid";
2647         $params = array('userid'=>$userid);
2648     } else {
2649         $user = "";
2650     }
2651     $params['aid'] = $assignment->id;
2652
2653     $sql = "SELECT u.id, u.id AS userid, s.grade AS rawgrade, s.submissioncomment AS feedback, s.format AS feedbackformat,
2654                    s.teacher AS usermodified, s.timemarked AS dategraded, s.timemodified AS datesubmitted
2655               FROM {user} u, {assignment_submissions} s
2656              WHERE u.id = s.userid AND s.assignment = :aid
2657                    $user";
2658
2659     return $DB->get_records_sql($sql, $params);
2660 }
2661
2662 /**
2663  * Update activity grades
2664  *
2665  * @param object $assignment
2666  * @param int $userid specific user only, 0 means all
2667  */
2668 function assignment_update_grades($assignment, $userid=0, $nullifnone=true) {
2669     global $CFG, $DB;
2670     require_once($CFG->libdir.'/gradelib.php');
2671
2672     if ($assignment->grade == 0) {
2673         assignment_grade_item_update($assignment);
2674
2675     } else if ($grades = assignment_get_user_grades($assignment, $userid)) {
2676         foreach($grades as $k=>$v) {
2677             if ($v->rawgrade == -1) {
2678                 $grades[$k]->rawgrade = null;
2679             }
2680         }
2681         assignment_grade_item_update($assignment, $grades);
2682
2683     } else {
2684         assignment_grade_item_update($assignment);
2685     }
2686 }
2687
2688 /**
2689  * Update all grades in gradebook.
2690  */
2691 function assignment_upgrade_grades() {
2692     global $DB;
2693
2694     $sql = "SELECT COUNT('x')
2695               FROM {assignment} a, {course_modules} cm, {modules} m
2696              WHERE m.name='assignment' AND m.id=cm.module AND cm.instance=a.id";
2697     $count = $DB->count_records_sql($sql);
2698
2699     $sql = "SELECT a.*, cm.idnumber AS cmidnumber, a.course AS courseid
2700               FROM {assignment} a, {course_modules} cm, {modules} m
2701              WHERE m.name='assignment' AND m.id=cm.module AND cm.instance=a.id";
2702     $rs = $DB->get_recordset_sql($sql);
2703     if ($rs->valid()) {
2704         // too much debug output
2705         $pbar = new progress_bar('assignmentupgradegrades', 500, true);
2706         $i=0;
2707         foreach ($rs as $assignment) {
2708             $i++;
2709             upgrade_set_timeout(60*5); // set up timeout, may also abort execution
2710             assignment_update_grades($assignment);
2711             $pbar->update($i, $count, "Updating Assignment grades ($i/$count).");
2712         }
2713         upgrade_set_timeout(); // reset to default timeout
2714     }
2715     $rs->close();
2716 }
2717
2718 /**
2719  * Create grade item for given assignment
2720  *
2721  * @param object $assignment object with extra cmidnumber
2722  * @param mixed optional array/object of grade(s); 'reset' means reset grades in gradebook
2723  * @return int 0 if ok, error code otherwise
2724  */
2725 function assignment_grade_item_update($assignment, $grades=NULL) {
2726     global $CFG;
2727     require_once($CFG->libdir.'/gradelib.php');
2728
2729     if (!isset($assignment->courseid)) {
2730         $assignment->courseid = $assignment->course;
2731     }
2732
2733     $params = array('itemname'=>$assignment->name, 'idnumber'=>$assignment->cmidnumber);
2734
2735     if ($assignment->grade > 0) {
2736         $params['gradetype'] = GRADE_TYPE_VALUE;
2737         $params['grademax']  = $assignment->grade;
2738         $params['grademin']  = 0;
2739
2740     } else if ($assignment->grade < 0) {
2741         $params['gradetype'] = GRADE_TYPE_SCALE;
2742         $params['scaleid']   = -$assignment->grade;
2743
2744     } else {
2745         $params['gradetype'] = GRADE_TYPE_TEXT; // allow text comments only
2746     }
2747
2748     if ($grades  === 'reset') {
2749         $params['reset'] = true;
2750         $grades = NULL;
2751     }
2752
2753     return grade_update('mod/assignment', $assignment->courseid, 'mod', 'assignment', $assignment->id, 0, $grades, $params);
2754 }
2755
2756 /**
2757  * Delete grade item for given assignment
2758  *
2759  * @param object $assignment object
2760  * @return object assignment
2761  */
2762 function assignment_grade_item_delete($assignment) {
2763     global $CFG;
2764     require_once($CFG->libdir.'/gradelib.php');
2765
2766     if (!isset($assignment->courseid)) {
2767         $assignment->courseid = $assignment->course;
2768     }
2769
2770     return grade_update('mod/assignment', $assignment->courseid, 'mod', 'assignment', $assignment->id, 0, NULL, array('deleted'=>1));
2771 }
2772
2773 /**
2774  * Returns the users with data in one assignment (students and teachers)
2775  *
2776  * @todo: deprecated - to be deleted in 2.2
2777  *
2778  * @param $assignmentid int
2779  * @return array of user objects
2780  */
2781 function assignment_get_participants($assignmentid) {
2782     global $CFG, $DB;
2783
2784     //Get students
2785     $students = $DB->get_records_sql("SELECT DISTINCT u.id, u.id
2786                                         FROM {user} u,
2787                                              {assignment_submissions} a
2788                                        WHERE a.assignment = ? and
2789                                              u.id = a.userid", array($assignmentid));
2790     //Get teachers
2791     $teachers = $DB->get_records_sql("SELECT DISTINCT u.id, u.id
2792                                         FROM {user} u,
2793                                              {assignment_submissions} a
2794                                        WHERE a.assignment = ? and
2795                                              u.id = a.teacher", array($assignmentid));
2796
2797     //Add teachers to students
2798     if ($teachers) {
2799         foreach ($teachers as $teacher) {
2800             $students[$teacher->id] = $teacher;
2801         }
2802     }
2803     //Return students array (it contains an array of unique users)
2804     return ($students);
2805 }
2806
2807 /**
2808  * Serves assignment submissions and other files.
2809  *
2810  * @param object $course
2811  * @param object $cm
2812  * @param object $context
2813  * @param string $filearea
2814  * @param array $args
2815  * @param bool $forcedownload
2816  * @return bool false if file not found, does not return if found - just send the file
2817  */
2818 function assignment_pluginfile($course, $cm, $context, $filearea, $args, $forcedownload) {
2819     global $CFG, $DB;
2820
2821     if ($context->contextlevel != CONTEXT_MODULE) {
2822         return false;
2823     }
2824
2825     require_login($course, false, $cm);
2826
2827     if (!$assignment = $DB->get_record('assignment', array('id'=>$cm->instance))) {
2828         return false;
2829     }
2830
2831     require_once($CFG->dirroot.'/mod/assignment/type/'.$assignment->assignmenttype.'/assignment.class.php');
2832     $assignmentclass = 'assignment_'.$assignment->assignmenttype;
2833     $assignmentinstance = new $assignmentclass($cm->id, $assignment, $cm, $course);
2834
2835     return $assignmentinstance->send_file($filearea, $args);
2836 }
2837 /**
2838  * Checks if a scale is being used by an assignment
2839  *
2840  * This is used by the backup code to decide whether to back up a scale
2841  * @param $assignmentid int
2842  * @param $scaleid int
2843  * @return boolean True if the scale is used by the assignment
2844  */
2845 function assignment_scale_used($assignmentid, $scaleid) {
2846     global $DB;
2847
2848     $return = false;
2849
2850     $rec = $DB->get_record('assignment', array('id'=>$assignmentid,'grade'=>-$scaleid));
2851
2852     if (!empty($rec) && !empty($scaleid)) {
2853         $return = true;
2854     }
2855
2856     return $return;
2857 }
2858
2859 /**
2860  * Checks if scale is being used by any instance of assignment
2861  *
2862  * This is used to find out if scale used anywhere
2863  * @param $scaleid int
2864  * @return boolean True if the scale is used by any assignment
2865  */
2866 function assignment_scale_used_anywhere($scaleid) {
2867     global $DB;
2868
2869     if ($scaleid and $DB->record_exists('assignment', array('grade'=>-$scaleid))) {
2870         return true;
2871     } else {
2872         return false;
2873     }
2874 }
2875
2876 /**
2877  * Make sure up-to-date events are created for all assignment instances
2878  *
2879  * This standard function will check all instances of this module
2880  * and make sure there are up-to-date events created for each of them.
2881  * If courseid = 0, then every assignment event in the site is checked, else
2882  * only assignment events belonging to the course specified are checked.
2883  * This function is used, in its new format, by restore_refresh_events()
2884  *
2885  * @param $courseid int optional If zero then all assignments for all courses are covered
2886  * @return boolean Always returns true
2887  */
2888 function assignment_refresh_events($courseid = 0) {
2889     global $DB;
2890
2891     if ($courseid == 0) {
2892         if (! $assignments = $DB->get_records("assignment")) {
2893             return true;
2894         }
2895     } else {
2896         if (! $assignments = $DB->get_records("assignment", array("course"=>$courseid))) {
2897             return true;
2898         }
2899     }
2900     $moduleid = $DB->get_field('modules', 'id', array('name'=>'assignment'));
2901
2902     foreach ($assignments as $assignment) {
2903         $cm = get_coursemodule_from_id('assignment', $assignment->id);
2904         $event = new stdClass();
2905         $event->name        = $assignment->name;
2906         $event->description = format_module_intro('assignment', $assignment, $cm->id);
2907         $event->timestart   = $assignment->timedue;
2908
2909         if ($event->id = $DB->get_field('event', 'id', array('modulename'=>'assignment', 'instance'=>$assignment->id))) {
2910             update_event($event);
2911
2912         } else {
2913             $event->courseid    = $assignment->course;
2914             $event->groupid     = 0;
2915             $event->userid      = 0;
2916             $event->modulename  = 'assignment';
2917             $event->instance    = $assignment->id;
2918             $event->eventtype   = 'due';
2919             $event->timeduration = 0;
2920             $event->visible     = $DB->get_field('course_modules', 'visible', array('module'=>$moduleid, 'instance'=>$assignment->id));
2921             add_event($event);
2922         }
2923
2924     }
2925     return true;
2926 }
2927
2928 /**
2929  * Print recent activity from all assignments in a given course
2930  *
2931  * This is used by the recent activity block
2932  */
2933 function assignment_print_recent_activity($course, $viewfullnames, $timestart) {
2934     global $CFG, $USER, $DB, $OUTPUT;
2935
2936     // do not use log table if possible, it may be huge
2937
2938     if (!$submissions = $DB->get_records_sql("SELECT asb.id, asb.timemodified, cm.id AS cmid, asb.userid,
2939                                                      u.firstname, u.lastname, u.email, u.picture
2940                                                 FROM {assignment_submissions} asb
2941                                                      JOIN {assignment} a      ON a.id = asb.assignment
2942                                                      JOIN {course_modules} cm ON cm.instance = a.id
2943                                                      JOIN {modules} md        ON md.id = cm.module
2944                                                      JOIN {user} u            ON u.id = asb.userid
2945                                                WHERE asb.timemodified > ? AND
2946                                                      a.course = ? AND
2947                                                      md.name = 'assignment'
2948                                             ORDER BY asb.timemodified ASC", array($timestart, $course->id))) {
2949          return false;
2950     }
2951
2952     $modinfo =& get_fast_modinfo($course); // reference needed because we might load the groups
2953     $show    = array();
2954     $grader  = array();
2955
2956     foreach($submissions as $submission) {
2957         if (!array_key_exists($submission->cmid, $modinfo->cms)) {
2958             continue;
2959         }
2960         $cm = $modinfo->cms[$submission->cmid];
2961         if (!$cm->uservisible) {
2962             continue;
2963         }
2964         if ($submission->userid == $USER->id) {
2965             $show[] = $submission;
2966             continue;
2967         }
2968
2969         // the act of sumbitting of assignment may be considered private - only graders will see it if specified
2970         if (empty($CFG->assignment_showrecentsubmissions)) {
2971             if (!array_key_exists($cm->id, $grader)) {
2972                 $grader[$cm->id] = has_capability('moodle/grade:viewall', get_context_instance(CONTEXT_MODULE, $cm->id));
2973             }
2974             if (!$grader[$cm->id]) {
2975                 continue;
2976             }
2977         }
2978
2979         $groupmode = groups_get_activity_groupmode($cm, $course);
2980
2981         if ($groupmode == SEPARATEGROUPS and !has_capability('moodle/site:accessallgroups', get_context_instance(CONTEXT_MODULE, $cm->id))) {
2982             if (isguestuser()) {
2983                 // shortcut - guest user does not belong into any group
2984                 continue;
2985             }
2986
2987             if (is_null($modinfo->groups)) {
2988                 $modinfo->groups = groups_get_user_groups($course->id); // load all my groups and cache it in modinfo
2989             }
2990
2991             // this will be slow - show only users that share group with me in this cm
2992             if (empty($modinfo->groups[$cm->id])) {
2993                 continue;
2994             }
2995             $usersgroups =  groups_get_all_groups($course->id, $submission->userid, $cm->groupingid);
2996             if (is_array($usersgroups)) {
2997                 $usersgroups = array_keys($usersgroups);
2998                 $intersect = array_intersect($usersgroups, $modinfo->groups[$cm->id]);
2999                 if (empty($intersect)) {
3000                     continue;
3001                 }
3002             }
3003         }
3004         $show[] = $submission;
3005     }
3006
3007     if (empty($show)) {
3008         return false;
3009     }
3010
3011     echo $OUTPUT->heading(get_string('newsubmissions', 'assignment').':', 3);
3012
3013     foreach ($show as $submission) {
3014         $cm = $modinfo->cms[$submission->cmid];
3015         $link = $CFG->wwwroot.'/mod/assignment/view.php?id='.$cm->id;
3016         print_recent_activity_note($submission->timemodified, $submission, $cm->name, $link, false, $viewfullnames);
3017     }
3018
3019     return true;
3020 }
3021
3022
3023 /**
3024  * Returns all assignments since a given time in specified forum.
3025  */
3026 function assignment_get_recent_mod_activity(&$activities, &$index, $timestart, $courseid, $cmid, $userid=0, $groupid=0)  {
3027     global $CFG, $COURSE, $USER, $DB;
3028
3029     if ($COURSE->id == $courseid) {
3030         $course = $COURSE;
3031     } else {
3032         $course = $DB->get_record('course', array('id'=>$courseid));
3033     }
3034
3035     $modinfo =& get_fast_modinfo($course);
3036
3037     $cm = $modinfo->cms[$cmid];
3038
3039     $params = array();
3040     if ($userid) {
3041         $userselect = "AND u.id = :userid";
3042         $params['userid'] = $userid;
3043     } else {
3044         $userselect = "";
3045     }
3046
3047     if ($groupid) {
3048         $groupselect = "AND gm.groupid = :groupid";
3049         $groupjoin   = "JOIN {groups_members} gm ON  gm.userid=u.id";
3050         $params['groupid'] = $groupid;
3051     } else {
3052         $groupselect = "";
3053         $groupjoin   = "";
3054     }
3055
3056     $params['cminstance'] = $cm->instance;
3057     $params['timestart'] = $timestart;
3058
3059     $userfields = user_picture::fields('u', null, 'userid');
3060
3061     if (!$submissions = $DB->get_records_sql("SELECT asb.id, asb.timemodified,
3062                                                      $userfields
3063                                                 FROM {assignment_submissions} asb
3064                                                 JOIN {assignment} a      ON a.id = asb.assignment
3065                                                 JOIN {user} u            ON u.id = asb.userid
3066                                           $groupjoin
3067                                                WHERE asb.timemodified > :timestart AND a.id = :cminstance
3068                                                      $userselect $groupselect
3069                                             ORDER BY asb.timemodified ASC", $params)) {
3070          return;
3071     }
3072
3073     $groupmode       = groups_get_activity_groupmode($cm, $course);
3074     $cm_context      = get_context_instance(CONTEXT_MODULE, $cm->id);
3075     $grader          = has_capability('moodle/grade:viewall', $cm_context);
3076     $accessallgroups = has_capability('moodle/site:accessallgroups', $cm_context);
3077     $viewfullnames   = has_capability('moodle/site:viewfullnames', $cm_context);
3078
3079     if (is_null($modinfo->groups)) {
3080         $modinfo->groups = groups_get_user_groups($course->id); // load all my groups and cache it in modinfo
3081     }
3082
3083     $show = array();
3084
3085     foreach($submissions as $submission) {
3086         if ($submission->userid == $USER->id) {
3087             $show[] = $submission;
3088             continue;
3089         }
3090         // the act of submitting of assignment may be considered private - only graders will see it if specified
3091         if (empty($CFG->assignment_showrecentsubmissions)) {
3092             if (!$grader) {
3093                 continue;
3094             }
3095         }
3096
3097         if ($groupmode == SEPARATEGROUPS and !$accessallgroups) {
3098             if (isguestuser()) {
3099                 // shortcut - guest user does not belong into any group
3100                 continue;
3101             }
3102
3103             // this will be slow - show only users that share group with me in this cm
3104             if (empty($modinfo->groups[$cm->id])) {
3105                 continue;
3106             }
3107             $usersgroups = groups_get_all_groups($course->id, $cm->userid, $cm->groupingid);
3108             if (is_array($usersgroups)) {
3109                 $usersgroups = array_keys($usersgroups);
3110                 $intersect = array_intersect($usersgroups, $modinfo->groups[$cm->id]);
3111                 if (empty($intersect)) {
3112                     continue;
3113                 }
3114             }
3115         }
3116         $show[] = $submission;
3117     }
3118
3119     if (empty($show)) {
3120         return;
3121     }
3122
3123     if ($grader) {
3124         require_once($CFG->libdir.'/gradelib.php');
3125         $userids = array();
3126         foreach ($show as $id=>$submission) {
3127             $userids[] = $submission->userid;
3128
3129         }
3130         $grades = grade_get_grades($courseid, 'mod', 'assignment', $cm->instance, $userids);
3131     }
3132
3133     $aname = format_string($cm->name,true);
3134     foreach ($show as $submission) {
3135         $tmpactivity = new stdClass();
3136
3137         $tmpactivity->type         = 'assignment';
3138         $tmpactivity->cmid         = $cm->id;
3139         $tmpactivity->name         = $aname;
3140         $tmpactivity->sectionnum   = $cm->sectionnum;
3141         $tmpactivity->timestamp    = $submission->timemodified;
3142
3143         if ($grader) {
3144             $tmpactivity->grade = $grades->items[0]->grades[$submission->userid]->str_long_grade;
3145         }
3146
3147         $userfields = explode(',', user_picture::fields());
3148         foreach ($userfields as $userfield) {
3149             if ($userfield == 'id') {
3150                 $tmpactivity->user->{$userfield} = $submission->userid; // aliased in SQL above
3151             } else {
3152                 $tmpactivity->user->{$userfield} = $submission->{$userfield};
3153             }
3154         }
3155         $tmpactivity->user->fullname = fullname($submission, $viewfullnames);
3156
3157         $activities[$index++] = $tmpactivity;
3158     }
3159
3160     return;
3161 }
3162
3163 /**
3164  * Print recent activity from all assignments in a given course
3165  *
3166  * This is used by course/recent.php
3167  */
3168 function assignment_print_recent_mod_activity($activity, $courseid, $detail, $modnames)  {
3169     global $CFG, $OUTPUT;
3170
3171     echo '<table border="0" cellpadding="3" cellspacing="0" class="assignment-recent">';
3172
3173     echo "<tr><td class=\"userpicture\" valign=\"top\">";
3174     echo $OUTPUT->user_picture($activity->user);
3175     echo "</td><td>";
3176
3177     if ($detail) {
3178         $modname = $modnames[$activity->type];
3179         echo '<div class="title">';
3180         echo "<img src=\"" . $OUTPUT->pix_url('icon', 'assignment') . "\" ".
3181              "class=\"icon\" alt=\"$modname\">";
3182         echo "<a href=\"$CFG->wwwroot/mod/assignment/view.php?id={$activity->cmid}\">{$activity->name}</a>";
3183         echo '</div>';
3184     }
3185
3186     if (isset($activity->grade)) {
3187         echo '<div class="grade">';
3188         echo get_string('grade').': ';
3189         echo $activity->grade;
3190         echo '</div>';
3191     }
3192
3193     echo '<div class="user">';
3194     echo "<a href=\"$CFG->wwwroot/user/view.php?id={$activity->user->id}&amp;course=$courseid\">"
3195          ."{$activity->user->fullname}</a>  - ".userdate($activity->timestamp);
3196     echo '</div>';
3197
3198     echo "</td></tr></table>";
3199 }
3200
3201 /// GENERIC SQL FUNCTIONS
3202
3203 /**
3204  * Fetch info from logs
3205  *
3206  * @param $log object with properties ->info (the assignment id) and ->userid
3207  * @return array with assignment name and user firstname and lastname
3208  */
3209 function assignment_log_info($log) {
3210     global $CFG, $DB;
3211
3212     return $DB->get_record_sql("SELECT a.name, u.firstname, u.lastname
3213                                   FROM {assignment} a, {user} u
3214                                  WHERE a.id = ? AND u.id = ?", array($log->info, $log->userid));
3215 }
3216
3217 /**
3218  * Return list of marked submissions that have not been mailed out for currently enrolled students
3219  *
3220  * @return array
3221  */
3222 function assignment_get_unmailed_submissions($starttime, $endtime) {
3223     global $CFG, $DB;
3224
3225     return $DB->get_records_sql("SELECT s.*, a.course, a.name
3226                                    FROM {assignment_submissions} s,
3227                                         {assignment} a
3228                                   WHERE s.mailed = 0
3229                                         AND s.timemarked <= ?
3230                                         AND s.timemarked >= ?
3231                                         AND s.assignment = a.id", array($endtime, $starttime));
3232 }
3233
3234 /**
3235  * Counts all real assignment submissions by ENROLLED students (not empty ones)
3236  *
3237  * There are also assignment type methods count_real_submissions() which in the default
3238  * implementation simply call this function.
3239  * @param $groupid int optional If nonzero then count is restricted to this group
3240  * @return int The number of submissions
3241  */
3242 function assignment_count_real_submissions($cm, $groupid=0) {
3243     global $CFG, $DB;
3244
3245     $context = get_context_instance(CONTEXT_MODULE, $cm->id);
3246
3247     // this is all the users with this capability set, in this context or higher
3248     if ($users = get_enrolled_users($context, 'mod/assignment:view', $groupid, 'u.id')) {
3249         $users = array_keys($users);
3250     }
3251
3252     // if groupmembersonly used, remove users who are not in any group
3253     if ($users and !empty($CFG->enablegroupmembersonly) and $cm->groupmembersonly) {
3254         if ($groupingusers = groups_get_grouping_members($cm->groupingid, 'u.id', 'u.id')) {
3255             $users = array_intersect($users, array_keys($groupingusers));
3256         }
3257     }
3258
3259     if (empty($users)) {
3260         return 0;
3261     }
3262
3263     $userlists = implode(',', $users);
3264
3265     return $DB->count_records_sql("SELECT COUNT('x')
3266                                      FROM {assignment_submissions}
3267                                     WHERE assignment = ? AND
3268                                           timemodified > 0 AND
3269                                           userid IN ($userlists)", array($cm->instance));
3270 }
3271
3272
3273 /**
3274  * Return all assignment submissions by ENROLLED students (even empty)
3275  *
3276  * There are also assignment type methods get_submissions() wich in the default
3277  * implementation simply call this function.
3278  * @param $sort string optional field names for the ORDER BY in the sql query
3279  * @param $dir string optional specifying the sort direction, defaults to DESC
3280  * @return array The submission objects indexed by id
3281  */
3282 function assignment_get_all_submissions($assignment, $sort="", $dir="DESC") {
3283 /// Return all assignment submissions by ENROLLED students (even empty)
3284     global $CFG, $DB;
3285
3286     if ($sort == "lastname" or $sort == "firstname") {
3287         $sort = "u.$sort $dir";
3288     } else if (empty($sort)) {
3289         $sort = "a.timemodified DESC";
3290     } else {
3291         $sort = "a.$sort $dir";
3292     }
3293
3294     /* not sure this is needed at all since assignment already has a course define, so this join?
3295     $select = "s.course = '$assignment->course' AND";
3296     if ($assignment->course == SITEID) {
3297         $select = '';
3298     }*/
3299
3300     return $DB->get_records_sql("SELECT a.*
3301                                    FROM {assignment_submissions} a, {user} u
3302                                   WHERE u.id = a.userid
3303                                         AND a.assignment = ?
3304                                ORDER BY $sort", array($assignment->id));
3305
3306 }
3307
3308 /**
3309  * Add a get_coursemodule_info function in case any assignment type wants to add 'extra' information
3310  * for the course (see resource).
3311  *
3312  * Given a course_module object, this function returns any "extra" information that may be needed
3313  * when printing this activity in a course listing.  See get_array_of_activities() in course/lib.php.
3314  *
3315  * @param $coursemodule object The coursemodule object (record).
3316  * @return object An object on information that the courses will know about (most noticeably, an icon).
3317  *
3318  */
3319 function assignment_get_coursemodule_info($coursemodule) {
3320     global $CFG, $DB;
3321
3322     if (! $assignment = $DB->get_record('assignment', array('id'=>$coursemodule->instance), 'id, assignmenttype, name')) {
3323         return false;
3324     }
3325
3326     $libfile = "$CFG->dirroot/mod/assignment/type/$assignment->assignmenttype/assignment.class.php";
3327
3328     if (file_exists($libfile)) {
3329         require_once($libfile);
3330         $assignmentclass = "assignment_$assignment->assignmenttype";
3331         $ass = new $assignmentclass('staticonly');
3332         if ($result = $ass->get_coursemodule_info($coursemodule)) {
3333             return $result;
3334         } else {
3335             $info = new stdClass();
3336             $info->name = $assignment->name;
3337             return $info;
3338         }
3339
3340     } else {
3341         debugging('Incorrect assignment type: '.$assignment->assignmenttype);
3342         return false;
3343     }
3344 }
3345
3346
3347
3348 /// OTHER GENERAL FUNCTIONS FOR ASSIGNMENTS  ///////////////////////////////////////
3349
3350 /**
3351  * Returns an array of installed assignment types indexed and sorted by name
3352  *