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