calendar/lib.php

   1 <?php
   2 // This file is part of Moodle - http://moodle.org/
   3 //
   4 // Moodle is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU General Public License as published by
   6 // the Free Software Foundation, either version 3 of the License, or
   7 // (at your option) any later version.
   8 //
   9 // Moodle is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 /**
  18  * Calendar extension
  19  *
  20  * @package    core_calendar
  21  * @copyright  2004 Greek School Network (http://www.sch.gr), Jon Papaioannou,
  22  *             Avgoustos Tsinakos
  23  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24  */
  25
  26 /**
  27  *  These are read by the administration component to provide default values
  28  */
  29
  30 /**
  31  * CALENDAR_DEFAULT_UPCOMING_LOOKAHEAD - default value of upcoming event preference
  32  */
  33 define('CALENDAR_DEFAULT_UPCOMING_LOOKAHEAD', 21);
  34
  35 /**
  36  * CALENDAR_DEFAULT_UPCOMING_MAXEVENTS - default value to display the maximum number of upcoming event
  37  */
  38 define('CALENDAR_DEFAULT_UPCOMING_MAXEVENTS', 10);
  39
  40 /**
  41  * CALENDAR_DEFAULT_STARTING_WEEKDAY - default value to display the starting weekday
  42  */
  43 define('CALENDAR_DEFAULT_STARTING_WEEKDAY', 1);
  44
  45 // This is a packed bitfield: day X is "weekend" if $field & (1 << X) is true
  46 // Default value = 65 = 64 + 1 = 2^6 + 2^0 = Saturday & Sunday
  47
  48 /**
  49  * CALENDAR_DEFAULT_WEEKEND - default value for weekend (Saturday & Sunday)
  50  */
  51 define('CALENDAR_DEFAULT_WEEKEND', 65);
  52
  53 /**
  54  * CALENDAR_URL - path to calendar's folder
  55  */
  56 define('CALENDAR_URL', $CFG->wwwroot.'/calendar/');
  57
  58 /**
  59  * CALENDAR_TF_24 - Calendar time in 24 hours format
  60  */
  61 define('CALENDAR_TF_24', '%H:%M');
  62
  63 /**
  64  * CALENDAR_TF_12 - Calendar time in 12 hours format
  65  */
  66 define('CALENDAR_TF_12', '%I:%M %p');
  67
  68 /**
  69  * CALENDAR_EVENT_GLOBAL - Global calendar event types
  70  */
  71 define('CALENDAR_EVENT_GLOBAL', 1);
  72
  73 /**
  74  * CALENDAR_EVENT_COURSE - Course calendar event types
  75  */
  76 define('CALENDAR_EVENT_COURSE', 2);
  77
  78 /**
  79  * CALENDAR_EVENT_GROUP - group calendar event types
  80  */
  81 define('CALENDAR_EVENT_GROUP', 4);
  82
  83 /**
  84  * CALENDAR_EVENT_USER - user calendar event types
  85  */
  86 define('CALENDAR_EVENT_USER', 8);
  87
  88 /**
  89  * CALENDAR_STARTING_WEEKDAY - has since been deprecated please call calendar_get_starting_weekday() instead
  90  *
  91  * @deprecated Moodle 2.0 MDL-24284- please do not use this function any more.
  92  * @todo MDL-31132 This will be deleted in Moodle 2.3.
  93  * @see calendar_get_starting_weekday()
  94  */
  95 define('CALENDAR_STARTING_WEEKDAY', CALENDAR_DEFAULT_STARTING_WEEKDAY);
  96
  97 /**
  98  * Return the days of the week
  99  *
 100  * @return array array of days
 101  */
 102 function calendar_get_days() {
 103     return array('sunday', 'monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday');
 104 }
 105
 106 /**
 107  * Gets the first day of the week
 108  *
 109  * Used to be define('CALENDAR_STARTING_WEEKDAY', blah);
 110  *
 111  * @return int
 112  */
 113 function calendar_get_starting_weekday() {
 114     global $CFG;
 115
 116     if (isset($CFG->calendar_startwday)) {
 117         $firstday = $CFG->calendar_startwday;
 118     } else {
 119         $firstday = get_string('firstdayofweek', 'langconfig');
 120     }
 121
 122     if(!is_numeric($firstday)) {
 123         return CALENDAR_DEFAULT_STARTING_WEEKDAY;
 124     } else {
 125         return intval($firstday) % 7;
 126     }
 127 }
 128
 129 /**
 130  * Generates the HTML for a miniature calendar
 131  *
 132  * @param array $courses list of course
 133  * @param array $groups list of group
 134  * @param array $users user's info
 135  * @param int $cal_month calendar month in numeric, default is set to false
 136  * @param int $cal_year calendar month in numeric, default is set to false
 137  * @return string $content return html table for mini calendar
 138  */
 139 function calendar_get_mini($courses, $groups, $users, $cal_month = false, $cal_year = false) {
 140     global $CFG, $USER, $OUTPUT;
 141
 142     $display = new stdClass;
 143     $display->minwday = get_user_preferences('calendar_startwday', calendar_get_starting_weekday());
 144     $display->maxwday = $display->minwday + 6;
 145
 146     $content = '';
 147
 148     if(!empty($cal_month) && !empty($cal_year)) {
 149         $thisdate = usergetdate(time()); // Date and time the user sees at his location
 150         if($cal_month == $thisdate['mon'] && $cal_year == $thisdate['year']) {
 151             // Navigated to this month
 152             $date = $thisdate;
 153             $display->thismonth = true;
 154         } else {
 155             // Navigated to other month, let's do a nice trick and save us a lot of work...
 156             if(!checkdate($cal_month, 1, $cal_year)) {
 157                 $date = array('mday' => 1, 'mon' => $thisdate['mon'], 'year' => $thisdate['year']);
 158                 $display->thismonth = true;
 159             } else {
 160                 $date = array('mday' => 1, 'mon' => $cal_month, 'year' => $cal_year);
 161                 $display->thismonth = false;
 162             }
 163         }
 164     } else {
 165         $date = usergetdate(time()); // Date and time the user sees at his location
 166         $display->thismonth = true;
 167     }
 168
 169     // Fill in the variables we 're going to use, nice and tidy
 170     list($d, $m, $y) = array($date['mday'], $date['mon'], $date['year']); // This is what we want to display
 171     $display->maxdays = calendar_days_in_month($m, $y);
 172
 173     if (get_user_timezone_offset() < 99) {
 174         // We 'll keep these values as GMT here, and offset them when the time comes to query the db
 175         $display->tstart = gmmktime(0, 0, 0, $m, 1, $y); // This is GMT
 176         $display->tend = gmmktime(23, 59, 59, $m, $display->maxdays, $y); // GMT
 177     } else {
 178         // no timezone info specified
 179         $display->tstart = mktime(0, 0, 0, $m, 1, $y);
 180         $display->tend = mktime(23, 59, 59, $m, $display->maxdays, $y);
 181     }
 182
 183     $startwday = dayofweek(1, $m, $y);
 184
 185     // Align the starting weekday to fall in our display range
 186     // This is simple, not foolproof.
 187     if($startwday < $display->minwday) {
 188         $startwday += 7;
 189     }
 190
 191     // TODO: THIS IS TEMPORARY CODE!
 192     // [pj] I was just reading through this and realized that I when writing this code I was probably
 193     // asking for trouble, as all these time manipulations seem to be unnecessary and a simple
 194     // make_timestamp would accomplish the same thing. So here goes a test:
 195     //$test_start = make_timestamp($y, $m, 1);
 196     //$test_end   = make_timestamp($y, $m, $display->maxdays, 23, 59, 59);
 197     //if($test_start != usertime($display->tstart) - dst_offset_on($display->tstart)) {
 198         //notify('Failed assertion in calendar/lib.php line 126; display->tstart = '.$display->tstart.', dst_offset = '.dst_offset_on($display->tstart).', usertime = '.usertime($display->tstart).', make_t = '.$test_start);
 199     //}
 200     //if($test_end != usertime($display->tend) - dst_offset_on($display->tend)) {
 201         //notify('Failed assertion in calendar/lib.php line 130; display->tend = '.$display->tend.', dst_offset = '.dst_offset_on($display->tend).', usertime = '.usertime($display->tend).', make_t = '.$test_end);
 202     //}
 203
 204
 205     // Get the events matching our criteria. Don't forget to offset the timestamps for the user's TZ!
 206     $events = calendar_get_events(
 207         usertime($display->tstart) - dst_offset_on($display->tstart),
 208         usertime($display->tend) - dst_offset_on($display->tend),
 209         $users, $groups, $courses);
 210
 211     // Set event course class for course events
 212     if (!empty($events)) {
 213         foreach ($events as $eventid => $event) {
 214             if (!empty($event->modulename)) {
 215                 $cm = get_coursemodule_from_instance($event->modulename, $event->instance);
 216                 if (!groups_course_module_visible($cm)) {
 217                     unset($events[$eventid]);
 218                 }
 219             }
 220         }
 221     }
 222
 223     // This is either a genius idea or an idiot idea: in order to not complicate things, we use this rule: if, after
 224     // possibly removing SITEID from $courses, there is only one course left, then clicking on a day in the month
 225     // will also set the $SESSION->cal_courses_shown variable to that one course. Otherwise, we 'd need to add extra
 226     // arguments to this function.
 227
 228     $hrefparams = array();
 229     if(!empty($courses)) {
 230         $courses = array_diff($courses, array(SITEID));
 231         if(count($courses) == 1) {
 232             $hrefparams['course'] = reset($courses);
 233         }
 234     }
 235
 236     // We want to have easy access by day, since the display is on a per-day basis.
 237     // Arguments passed by reference.
 238     //calendar_events_by_day($events, $display->tstart, $eventsbyday, $durationbyday, $typesbyday);
 239     calendar_events_by_day($events, $m, $y, $eventsbyday, $durationbyday, $typesbyday, $courses);
 240
 241     //Accessibility: added summary and <abbr> elements.
 242     $days_title = calendar_get_days();
 243
 244     $summary = get_string('calendarheading', 'calendar', userdate(make_timestamp($y, $m), get_string('strftimemonthyear')));
 245     $content .= '<table class="minicalendar calendartable" summary="'.$summary.'">'; // Begin table
 246     $content .= '<tr class="weekdays">'; // Header row: day names
 247
 248     // Print out the names of the weekdays
 249     $days = array('sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat');
 250     for($i = $display->minwday; $i <= $display->maxwday; ++$i) {
 251         // This uses the % operator to get the correct weekday no matter what shift we have
 252         // applied to the $display->minwday : $display->maxwday range from the default 0 : 6
 253         $content .= '<th scope="col"><abbr title="'. get_string($days_title[$i % 7], 'calendar') .'">'.
 254             get_string($days[$i % 7], 'calendar') ."</abbr></th>\n";
 255     }
 256
 257     $content .= '</tr><tr>'; // End of day names; prepare for day numbers
 258
 259     // For the table display. $week is the row; $dayweek is the column.
 260     $dayweek = $startwday;
 261
 262     // Paddding (the first week may have blank days in the beginning)
 263     for($i = $display->minwday; $i < $startwday; ++$i) {
 264         $content .= '<td class="dayblank">&nbsp;</td>'."\n";
 265     }
 266
 267     $weekend = CALENDAR_DEFAULT_WEEKEND;
 268     if (isset($CFG->calendar_weekend)) {
 269         $weekend = intval($CFG->calendar_weekend);
 270     }
 271
 272     // Now display all the calendar
 273     for($day = 1; $day <= $display->maxdays; ++$day, ++$dayweek) {
 274         if($dayweek > $display->maxwday) {
 275             // We need to change week (table row)
 276             $content .= '</tr><tr>';
 277             $dayweek = $display->minwday;
 278         }
 279
 280         // Reset vars
 281         $cell = '';
 282         if ($weekend & (1 << ($dayweek % 7))) {
 283             // Weekend. This is true no matter what the exact range is.
 284             $class = 'weekend day';
 285         } else {
 286             // Normal working day.
 287             $class = 'day';
 288         }
 289
 290         // Special visual fx if an event is defined
 291         if(isset($eventsbyday[$day])) {
 292             $class .= ' hasevent';
 293             $hrefparams['view'] = 'day';
 294             $dayhref = calendar_get_link_href(new moodle_url(CALENDAR_URL.'view.php', $hrefparams), $day, $m, $y);
 295
 296             $popupcontent = '';
 297             foreach($eventsbyday[$day] as $eventid) {
 298                 if (!isset($events[$eventid])) {
 299                     continue;
 300                 }
 301                 $event = $events[$eventid];
 302                 $popupalt  = '';
 303                 $component = 'moodle';
 304                 if(!empty($event->modulename)) {
 305                     $popupicon = 'icon';
 306                     $popupalt  = $event->modulename;
 307                     $component = $event->modulename;
 308                 } else if ($event->courseid == SITEID) {                                // Site event
 309                     $popupicon = 'c/site';
 310                 } else if ($event->courseid != 0 && $event->courseid != SITEID && $event->groupid == 0) {      // Course event
 311                     $popupicon = 'c/course';
 312                 } else if ($event->groupid) {                                      // Group event
 313                     $popupicon = 'c/group';
 314                 } else if ($event->userid) {                                       // User event
 315                     $popupicon = 'c/user';
 316                 }
 317
 318                 $dayhref->set_anchor('event_'.$event->id);
 319
 320                 $popupcontent .= html_writer::start_tag('div');
 321                 $popupcontent .= $OUTPUT->pix_icon($popupicon, $popupalt, $component);
 322                 $popupcontent .= html_writer::link($dayhref, format_string($event->name, true));
 323                 $popupcontent .= html_writer::end_tag('div');
 324             }
 325
 326             //Accessibility: functionality moved to calendar_get_popup.
 327             if($display->thismonth && $day == $d) {
 328                 $popup = calendar_get_popup(true, $events[$eventid]->timestart, $popupcontent);
 329             } else {
 330                 $popup = calendar_get_popup(false, $events[$eventid]->timestart, $popupcontent);
 331             }
 332
 333             // Class and cell content
 334             if(isset($typesbyday[$day]['startglobal'])) {
 335                 $class .= ' calendar_event_global';
 336             } else if(isset($typesbyday[$day]['startcourse'])) {
 337                 $class .= ' calendar_event_course';
 338             } else if(isset($typesbyday[$day]['startgroup'])) {
 339                 $class .= ' calendar_event_group';
 340             } else if(isset($typesbyday[$day]['startuser'])) {
 341                 $class .= ' calendar_event_user';
 342             }
 343             $cell = '<a href="'.(string)$dayhref.'" '.$popup.'>'.$day.'</a>';
 344         } else {
 345             $cell = $day;
 346         }
 347
 348         $durationclass = false;
 349         if (isset($typesbyday[$day]['durationglobal'])) {
 350             $durationclass = ' duration_global';
 351         } else if(isset($typesbyday[$day]['durationcourse'])) {
 352             $durationclass = ' duration_course';
 353         } else if(isset($typesbyday[$day]['durationgroup'])) {
 354             $durationclass = ' duration_group';
 355         } else if(isset($typesbyday[$day]['durationuser'])) {
 356             $durationclass = ' duration_user';
 357         }
 358         if ($durationclass) {
 359             $class .= ' duration '.$durationclass;
 360         }
 361
 362         // If event has a class set then add it to the table day <td> tag
 363         // Note: only one colour for minicalendar
 364         if(isset($eventsbyday[$day])) {
 365             foreach($eventsbyday[$day] as $eventid) {
 366                 if (!isset($events[$eventid])) {
 367                     continue;
 368                 }
 369                 $event = $events[$eventid];
 370                 if (!empty($event->class)) {
 371                     $class .= ' '.$event->class;
 372                 }
 373                 break;
 374             }
 375         }
 376
 377         // Special visual fx for today
 378         //Accessibility: hidden text for today, and popup.
 379         if($display->thismonth && $day == $d) {
 380             $class .= ' today';
 381             $today = get_string('today', 'calendar').' '.userdate(time(), get_string('strftimedayshort'));
 382
 383             if(! isset($eventsbyday[$day])) {
 384                 $class .= ' eventnone';
 385                 $popup = calendar_get_popup(true, false);
 386                 $cell = '<a href="#" '.$popup.'>'.$day.'</a>';
 387             }
 388             $cell = get_accesshide($today.' ').$cell;
 389         }
 390
 391         // Just display it
 392         if(!empty($class)) {
 393             $class = ' class="'.$class.'"';
 394         }
 395         $content .= '<td'.$class.'>'.$cell."</td>\n";
 396     }
 397
 398     // Paddding (the last week may have blank days at the end)
 399     for($i = $dayweek; $i <= $display->maxwday; ++$i) {
 400         $content .= '<td class="dayblank">&nbsp;</td>';
 401     }
 402     $content .= '</tr>'; // Last row ends
 403
 404     $content .= '</table>'; // Tabular display of days ends
 405
 406     return $content;
 407 }
 408
 409 /**
 410  * Gets the calendar popup
 411  *
 412  * It called at multiple points in from calendar_get_mini.
 413  * Copied and modified from calendar_get_mini.
 414  *
 415  * @param bool $is_today false except when called on the current day.
 416  * @param mixed $event_timestart $events[$eventid]->timestart, OR false if there are no events.
 417  * @param string $popupcontent content for the popup window/layout
 418  * @return string of eventid for the calendar_tooltip popup window/layout
 419  */
 420 function calendar_get_popup($is_today, $event_timestart, $popupcontent='') {
 421     global $PAGE;
 422     static $popupcount;
 423     if ($popupcount === null) {
 424         $popupcount = 1;
 425     }
 426     $popupcaption = '';
 427     if($is_today) {
 428         $popupcaption = get_string('today', 'calendar').' ';
 429     }
 430     if (false === $event_timestart) {
 431         $popupcaption .= userdate(time(), get_string('strftimedayshort'));
 432         $popupcontent = get_string('eventnone', 'calendar');
 433
 434     } else {
 435         $popupcaption .= get_string('eventsfor', 'calendar', userdate($event_timestart, get_string('strftimedayshort')));
 436     }
 437     $id = 'calendar_tooltip_'.$popupcount;
 438     $PAGE->requires->yui_module('moodle-calendar-eventmanager', 'M.core_calendar.add_event', array(array('eventId'=>$id,'title'=>$popupcaption, 'content'=>$popupcontent)));
 439
 440     $popupcount++;
 441     return 'id="'.$id.'"';
 442 }
 443
 444 /**
 445  * Gets the calendar upcoming event
 446  *
 447  * @param array $courses array of courses
 448  * @param array|int|bool $groups array of groups, group id or boolean for all/no group events
 449  * @param array|int|bool $users array of users, user id or boolean for all/no user events
 450  * @param int $daysinfuture number of days in the future we 'll look
 451  * @param int $maxevents maximum number of events
 452  * @param int $fromtime start time
 453  * @return array $output array of upcoming events
 454  */
 455 function calendar_get_upcoming($courses, $groups, $users, $daysinfuture, $maxevents, $fromtime=0) {
 456     global $CFG, $COURSE, $DB;
 457
 458     $display = new stdClass;
 459     $display->range = $daysinfuture; // How many days in the future we 'll look
 460     $display->maxevents = $maxevents;
 461
 462     $output = array();
 463
 464     // Prepare "course caching", since it may save us a lot of queries
 465     $coursecache = array();
 466
 467     $processed = 0;
 468     $now = time(); // We 'll need this later
 469     $usermidnighttoday = usergetmidnight($now);
 470
 471     if ($fromtime) {
 472         $display->tstart = $fromtime;
 473     } else {
 474         $display->tstart = $usermidnighttoday;
 475     }
 476
 477     // This works correctly with respect to the user's DST, but it is accurate
 478     // only because $fromtime is always the exact midnight of some day!
 479     $display->tend = usergetmidnight($display->tstart + DAYSECS * $display->range + 3 * HOURSECS) - 1;
 480
 481     // Get the events matching our criteria
 482     $events = calendar_get_events($display->tstart, $display->tend, $users, $groups, $courses);
 483
 484     // This is either a genius idea or an idiot idea: in order to not complicate things, we use this rule: if, after
 485     // possibly removing SITEID from $courses, there is only one course left, then clicking on a day in the month
 486     // will also set the $SESSION->cal_courses_shown variable to that one course. Otherwise, we 'd need to add extra
 487     // arguments to this function.
 488
 489     $hrefparams = array();
 490     if(!empty($courses)) {
 491         $courses = array_diff($courses, array(SITEID));
 492         if(count($courses) == 1) {
 493             $hrefparams['course'] = reset($courses);
 494         }
 495     }
 496
 497     if ($events !== false) {
 498
 499         $modinfo = get_fast_modinfo($COURSE);
 500
 501         foreach($events as $event) {
 502
 503
 504             if (!empty($event->modulename)) {
 505                 if ($event->courseid == $COURSE->id) {
 506                     if (isset($modinfo->instances[$event->modulename][$event->instance])) {
 507                         $cm = $modinfo->instances[$event->modulename][$event->instance];
 508                         if (!$cm->uservisible) {
 509                             continue;
 510                         }
 511                     }
 512                 } else {
 513                     if (!$cm = get_coursemodule_from_instance($event->modulename, $event->instance)) {
 514                         continue;
 515                     }
 516                     if (!coursemodule_visible_for_user($cm)) {
 517                         continue;
 518                     }
 519                 }
 520                 if ($event->modulename == 'assignment'){
 521                     // create calendar_event to test edit_event capability
 522                     // this new event will also prevent double creation of calendar_event object
 523                     $checkevent = new calendar_event($event);
 524                     // TODO: rewrite this hack somehow
 525                     if (!calendar_edit_event_allowed($checkevent)){ // cannot manage entries, eg. student
 526                         if (!$assignment = $DB->get_record('assignment', array('id'=>$event->instance))) {
 527                             // print_error("invalidid", 'assignment');
 528                             continue;
 529                         }
 530                         // assign assignment to assignment object to use hidden_is_hidden method
 531                         require_once($CFG->dirroot.'/mod/assignment/lib.php');
 532
 533                         if (!file_exists($CFG->dirroot.'/mod/assignment/type/'.$assignment->assignmenttype.'/assignment.class.php')) {
 534                             continue;
 535                         }
 536                         require_once ($CFG->dirroot.'/mod/assignment/type/'.$assignment->assignmenttype.'/assignment.class.php');
 537
 538                         $assignmentclass = 'assignment_'.$assignment->assignmenttype;
 539                         $assignmentinstance = new $assignmentclass($cm->id, $assignment, $cm);
 540
 541                         if ($assignmentinstance->description_is_hidden()){//force not to show description before availability
 542                             $event->description = get_string('notavailableyet', 'assignment');
 543                         }
 544                     }
 545                 }
 546             }
 547
 548             if ($processed >= $display->maxevents) {
 549                 break;
 550             }
 551
 552             $event->time = calendar_format_event_time($event, $now, $hrefparams);
 553             $output[] = $event;
 554             ++$processed;
 555         }
 556     }
 557     return $output;
 558 }
 559
 560 /**
 561  * Add calendar event metadata
 562  *
 563  * @param stdClass $event event info
 564  * @return stdClass $event metadata
 565  */
 566 function calendar_add_event_metadata($event) {
 567     global $CFG, $OUTPUT;
 568
 569     //Support multilang in event->name
 570     $event->name = format_string($event->name,true);
 571
 572     if(!empty($event->modulename)) {                                // Activity event
 573         // The module name is set. I will assume that it has to be displayed, and
 574         // also that it is an automatically-generated event. And of course that the
 575         // fields for get_coursemodule_from_instance are set correctly.
 576         $module = calendar_get_module_cached($coursecache, $event->modulename, $event->instance);
 577
 578         if ($module === false) {
 579             return;
 580         }
 581
 582         $modulename = get_string('modulename', $event->modulename);
 583         if (get_string_manager()->string_exists($event->eventtype, $event->modulename)) {
 584             // will be used as alt text if the event icon
 585             $eventtype = get_string($event->eventtype, $event->modulename);
 586         } else {
 587             $eventtype = '';
 588         }
 589         $icon = $OUTPUT->pix_url('icon', $event->modulename) . '';
 590
 591         $context = get_context_instance(CONTEXT_COURSE, $module->course);
 592         $fullname = format_string($coursecache[$module->course]->fullname, true, array('context' => $context));
 593
 594         $event->icon = '<img height="16" width="16" src="'.$icon.'" alt="'.$eventtype.'" title="'.$modulename.'" style="vertical-align: middle;" />';
 595         $event->referer = '<a href="'.$CFG->wwwroot.'/mod/'.$event->modulename.'/view.php?id='.$module->id.'">'.$event->name.'</a>';
 596         $event->courselink = '<a href="'.$CFG->wwwroot.'/course/view.php?id='.$module->course.'">'.$fullname.'</a>';
 597         $event->cmid = $module->id;
 598
 599
 600     } else if($event->courseid == SITEID) {                              // Site event
 601         $event->icon = '<img height="16" width="16" src="'.$OUTPUT->pix_url('c/site') . '" alt="'.get_string('globalevent', 'calendar').'" style="vertical-align: middle;" />';
 602         $event->cssclass = 'calendar_event_global';
 603     } else if($event->courseid != 0 && $event->courseid != SITEID && $event->groupid == 0) {          // Course event
 604         calendar_get_course_cached($coursecache, $event->courseid);
 605
 606         $context = get_context_instance(CONTEXT_COURSE, $event->courseid);
 607         $fullname = format_string($coursecache[$event->courseid]->fullname, true, array('context' => $context));
 608
 609         $event->icon = '<img height="16" width="16" src="'.$OUTPUT->pix_url('c/course') . '" alt="'.get_string('courseevent', 'calendar').'" style="vertical-align: middle;" />';
 610         $event->courselink = '<a href="'.$CFG->wwwroot.'/course/view.php?id='.$event->courseid.'">'.$fullname.'</a>';
 611         $event->cssclass = 'calendar_event_course';
 612     } else if ($event->groupid) {                                    // Group event
 613         $event->icon = '<img height="16" width="16" src="'.$OUTPUT->pix_url('c/group') . '" alt="'.get_string('groupevent', 'calendar').'" style="vertical-align: middle;" />';
 614         $event->cssclass = 'calendar_event_group';
 615     } else if($event->userid) {                                      // User event
 616         $event->icon = '<img height="16" width="16" src="'.$OUTPUT->pix_url('c/user') . '" alt="'.get_string('userevent', 'calendar').'" style="vertical-align: middle;" />';
 617         $event->cssclass = 'calendar_event_user';
 618     }
 619     return $event;
 620 }
 621
 622 /**
 623  * Get calendar events
 624  *
 625  * @param int $tstart Start time of time range for events
 626  * @param int $tend End time of time range for events
 627  * @param array|int|boolean $users array of users, user id or boolean for all/no user events
 628  * @param array|int|boolean $groups array of groups, group id or boolean for all/no group events
 629  * @param array|int|boolean $courses array of courses, course id or boolean for all/no course events
 630  * @param boolean $withduration whether only events starting within time range selected
 631  *                              or events in progress/already started selected as well
 632  * @param boolean $ignorehidden whether to select only visible events or all events
 633  * @return array $events of selected events or an empty array if there aren't any (or there was an error)
 634  */
 635 function calendar_get_events($tstart, $tend, $users, $groups, $courses, $withduration=true, $ignorehidden=true) {
 636     global $DB;
 637
 638     $whereclause = '';
 639     // Quick test
 640     if(is_bool($users) && is_bool($groups) && is_bool($courses)) {
 641         return array();
 642     }
 643
 644     if(is_array($users) && !empty($users)) {
 645         // Events from a number of users
 646         if(!empty($whereclause)) $whereclause .= ' OR';
 647         $whereclause .= ' (userid IN ('.implode(',', $users).') AND courseid = 0 AND groupid = 0)';
 648     } else if(is_numeric($users)) {
 649         // Events from one user
 650         if(!empty($whereclause)) $whereclause .= ' OR';
 651         $whereclause .= ' (userid = '.$users.' AND courseid = 0 AND groupid = 0)';
 652     } else if($users === true) {
 653         // Events from ALL users
 654         if(!empty($whereclause)) $whereclause .= ' OR';
 655         $whereclause .= ' (userid != 0 AND courseid = 0 AND groupid = 0)';
 656     } else if($users === false) {
 657         // No user at all, do nothing
 658     }
 659
 660     if(is_array($groups) && !empty($groups)) {
 661         // Events from a number of groups
 662         if(!empty($whereclause)) $whereclause .= ' OR';
 663         $whereclause .= ' groupid IN ('.implode(',', $groups).')';
 664     } else if(is_numeric($groups)) {
 665         // Events from one group
 666         if(!empty($whereclause)) $whereclause .= ' OR ';
 667         $whereclause .= ' groupid = '.$groups;
 668     } else if($groups === true) {
 669         // Events from ALL groups
 670         if(!empty($whereclause)) $whereclause .= ' OR ';
 671         $whereclause .= ' groupid != 0';
 672     }
 673     // boolean false (no groups at all): we don't need to do anything
 674
 675     if(is_array($courses) && !empty($courses)) {
 676         if(!empty($whereclause)) {
 677             $whereclause .= ' OR';
 678         }
 679         $whereclause .= ' (groupid = 0 AND courseid IN ('.implode(',', $courses).'))';
 680     } else if(is_numeric($courses)) {
 681         // One course
 682         if(!empty($whereclause)) $whereclause .= ' OR';
 683         $whereclause .= ' (groupid = 0 AND courseid = '.$courses.')';
 684     } else if ($courses === true) {
 685         // Events from ALL courses
 686         if(!empty($whereclause)) $whereclause .= ' OR';
 687         $whereclause .= ' (groupid = 0 AND courseid != 0)';
 688     }
 689
 690     // Security check: if, by now, we have NOTHING in $whereclause, then it means
 691     // that NO event-selecting clauses were defined. Thus, we won't be returning ANY
 692     // events no matter what. Allowing the code to proceed might return a completely
 693     // valid query with only time constraints, thus selecting ALL events in that time frame!
 694     if(empty($whereclause)) {
 695         return array();
 696     }
 697
 698     if($withduration) {
 699         $timeclause = '(timestart >= '.$tstart.' OR timestart + timeduration > '.$tstart.') AND timestart <= '.$tend;
 700     }
 701     else {
 702         $timeclause = 'timestart >= '.$tstart.' AND timestart <= '.$tend;
 703     }
 704     if(!empty($whereclause)) {
 705         // We have additional constraints
 706         $whereclause = $timeclause.' AND ('.$whereclause.')';
 707     }
 708     else {
 709         // Just basic time filtering
 710         $whereclause = $timeclause;
 711     }
 712
 713     if ($ignorehidden) {
 714         $whereclause .= ' AND visible = 1';
 715     }
 716
 717     $events = $DB->get_records_select('event', $whereclause, null, 'timestart');
 718     if ($events === false) {
 719         $events = array();
 720     }
 721     return $events;
 722 }
 723
 724 /**
 725  * Get control options for Calendar
 726  *
 727  * @param string $type of calendar
 728  * @param array $data calendar information
 729  * @return string $content return available control for the calender in html
 730  */
 731 function calendar_top_controls($type, $data) {
 732     global $CFG, $PAGE;
 733     $content = '';
 734     if(!isset($data['d'])) {
 735         $data['d'] = 1;
 736     }
 737
 738     // Ensure course id passed if relevant
 739     // Required due to changes in view/lib.php mainly (calendar_session_vars())
 740     $courseid = '';
 741     if (!empty($data['id'])) {
 742         $courseid = '&amp;course='.$data['id'];
 743     }
 744
 745     if(!checkdate($data['m'], $data['d'], $data['y'])) {
 746         $time = time();
 747     }
 748     else {
 749         $time = make_timestamp($data['y'], $data['m'], $data['d']);
 750     }
 751     $date = usergetdate($time);
 752
 753     $data['m'] = $date['mon'];
 754     $data['y'] = $date['year'];
 755     $urlbase = $PAGE->url;
 756
 757     //Accessibility: calendar block controls, replaced <table> with <div>.
 758     //$nexttext = link_arrow_right(get_string('monthnext', 'access'), $url='', $accesshide=true);
 759     //$prevtext = link_arrow_left(get_string('monthprev', 'access'), $url='', $accesshide=true);
 760
 761     switch($type) {
 762         case 'frontpage':
 763             list($prevmonth, $prevyear) = calendar_sub_month($data['m'], $data['y']);
 764             list($nextmonth, $nextyear) = calendar_add_month($data['m'], $data['y']);
 765             $nextlink = calendar_get_link_next(get_string('monthnext', 'access'), $urlbase, 0, $nextmonth, $nextyear, true);
 766             $prevlink = calendar_get_link_previous(get_string('monthprev', 'access'), $urlbase, 0, $prevmonth, $prevyear, true);
 767
 768             $calendarlink = calendar_get_link_href(new moodle_url(CALENDAR_URL.'view.php', array('view'=>'month')), 1, $data['m'], $data['y']);
 769             if (!empty($data['id'])) {
 770                 $calendarlink->param('course', $data['id']);
 771             }
 772
 773             if (right_to_left()) {
 774                 $left = $nextlink;
 775                 $right = $prevlink;
 776             } else {
 777                 $left = $prevlink;
 778                 $right = $nextlink;
 779             }
 780
 781             $content .= html_writer::start_tag('div', array('class'=>'calendar-controls'));
 782             $content .= $left.'<span class="hide"> | </span>';
 783             $content .= html_writer::tag('span', html_writer::link($calendarlink, userdate($time, get_string('strftimemonthyear')), array('title'=>get_string('monththis','calendar'))), array('class'=>'current'));
 784             $content .= '<span class="hide"> | </span>'. $right;
 785             $content .= "<span class=\"clearer\"><!-- --></span>\n";
 786             $content .= html_writer::end_tag('div');
 787
 788             break;
 789         case 'course':
 790             list($prevmonth, $prevyear) = calendar_sub_month($data['m'], $data['y']);
 791             list($nextmonth, $nextyear) = calendar_add_month($data['m'], $data['y']);
 792             $nextlink = calendar_get_link_next(get_string('monthnext', 'access'), $urlbase, 0, $nextmonth, $nextyear, true);
 793             $prevlink = calendar_get_link_previous(get_string('monthprev', 'access'), $urlbase, 0, $prevmonth, $prevyear, true);
 794
 795             $calendarlink = calendar_get_link_href(new moodle_url(CALENDAR_URL.'view.php', array('view'=>'month')), 1, $data['m'], $data['y']);
 796             if (!empty($data['id'])) {
 797                 $calendarlink->param('course', $data['id']);
 798             }
 799
 800             if (right_to_left()) {
 801                 $left = $nextlink;
 802                 $right = $prevlink;
 803             } else {
 804                 $left = $prevlink;
 805                 $right = $nextlink;
 806             }
 807
 808             $content .= html_writer::start_tag('div', array('class'=>'calendar-controls'));
 809             $content .= $left.'<span class="hide"> | </span>';
 810             $content .= html_writer::tag('span', html_writer::link($calendarlink, userdate($time, get_string('strftimemonthyear')), array('title'=>get_string('monththis','calendar'))), array('class'=>'current'));
 811             $content .= '<span class="hide"> | </span>'. $right;
 812             $content .= "<span class=\"clearer\"><!-- --></span>";
 813             $content .= html_writer::end_tag('div');
 814             break;
 815         case 'upcoming':
 816             $calendarlink = calendar_get_link_href(new moodle_url(CALENDAR_URL.'view.php', array('view'=>'upcoming')), 1, $data['m'], $data['y']);
 817             if (!empty($data['id'])) {
 818                 $calendarlink->param('course', $data['id']);
 819             }
 820             $calendarlink = html_writer::link($calendarlink, userdate($time, get_string('strftimemonthyear')));
 821             $content .= html_writer::tag('div', $calendarlink, array('class'=>'centered'));
 822             break;
 823         case 'display':
 824             $calendarlink = calendar_get_link_href(new moodle_url(CALENDAR_URL.'view.php', array('view'=>'month')), 1, $data['m'], $data['y']);
 825             if (!empty($data['id'])) {
 826                 $calendarlink->param('course', $data['id']);
 827             }
 828             $calendarlink = html_writer::link($calendarlink, userdate($time, get_string('strftimemonthyear')));
 829             $content .= html_writer::tag('h3', $calendarlink);
 830             break;
 831         case 'month':
 832             list($prevmonth, $prevyear) = calendar_sub_month($data['m'], $data['y']);
 833             list($nextmonth, $nextyear) = calendar_add_month($data['m'], $data['y']);
 834             $prevdate = make_timestamp($prevyear, $prevmonth, 1);
 835             $nextdate = make_timestamp($nextyear, $nextmonth, 1);
 836             $prevlink = calendar_get_link_previous(userdate($prevdate, get_string('strftimemonthyear')), 'view.php?view=month'.$courseid.'&amp;', 1, $prevmonth, $prevyear);
 837             $nextlink = calendar_get_link_next(userdate($nextdate, get_string('strftimemonthyear')), 'view.php?view=month'.$courseid.'&amp;', 1, $nextmonth, $nextyear);
 838
 839             if (right_to_left()) {
 840                 $left = $nextlink;
 841                 $right = $prevlink;
 842             } else {
 843                 $left = $prevlink;
 844                 $right = $nextlink;
 845             }
 846
 847             $content .= html_writer::start_tag('div', array('class'=>'calendar-controls'));
 848             $content .= $left . '<span class="hide"> | </span><h1 class="current">'.userdate($time, get_string('strftimemonthyear'))."</h1>";
 849             $content .= '<span class="hide"> | </span>' . $right;
 850             $content .= '<span class="clearer"><!-- --></span>';
 851             $content .= html_writer::end_tag('div')."\n";
 852             break;
 853         case 'day':
 854             $days = calendar_get_days();
 855             $data['d'] = $date['mday']; // Just for convenience
 856             $prevdate = usergetdate(make_timestamp($data['y'], $data['m'], $data['d'] - 1));
 857             $nextdate = usergetdate(make_timestamp($data['y'], $data['m'], $data['d'] + 1));
 858             $prevname = calendar_wday_name($days[$prevdate['wday']]);
 859             $nextname = calendar_wday_name($days[$nextdate['wday']]);
 860             $prevlink = calendar_get_link_previous($prevname, 'view.php?view=day'.$courseid.'&amp;', $prevdate['mday'], $prevdate['mon'], $prevdate['year']);
 861             $nextlink = calendar_get_link_next($nextname, 'view.php?view=day'.$courseid.'&amp;', $nextdate['mday'], $nextdate['mon'], $nextdate['year']);
 862
 863             if (right_to_left()) {
 864                 $left = $nextlink;
 865                 $right = $prevlink;
 866             } else {
 867                 $left = $prevlink;
 868                 $right = $nextlink;
 869             }
 870
 871             $content .= html_writer::start_tag('div', array('class'=>'calendar-controls'));
 872             $content .= $left;
 873             $content .= '<span class="hide"> | </span><span class="current">'.userdate($time, get_string('strftimedaydate')).'</span>';
 874             $content .= '<span class="hide"> | </span>'. $right;
 875             $content .= "<span class=\"clearer\"><!-- --></span>";
 876             $content .= html_writer::end_tag('div')."\n";
 877
 878             break;
 879     }
 880     return $content;
 881 }
 882
 883 /**
 884  * Get the controls filter for calendar.
 885  *
 886  * Filter is used to hide calendar info from the display page
 887  *
 888  * @param moodle_url $returnurl return-url for filter controls
 889  * @return string $content return filter controls in html
 890  */
 891 function calendar_filter_controls(moodle_url $returnurl) {
 892     global $CFG, $USER, $OUTPUT;
 893
 894     $groupevents = true;
 895
 896     $id = optional_param( 'id',0,PARAM_INT );
 897
 898     $seturl = new moodle_url('/calendar/set.php', array('return' => base64_encode($returnurl->out(false)), 'sesskey'=>sesskey()));
 899
 900     $content = '<table>';
 901     $content .= '<tr>';
 902
 903     $seturl->param('var', 'showglobal');
 904     if (calendar_show_event_type(CALENDAR_EVENT_GLOBAL)) {
 905         $content .= '<td class="eventskey calendar_event_global" style="width: 11px;"><img src="'.$OUTPUT->pix_url('t/hide') . '" class="iconsmall" alt="'.get_string('hide').'" title="'.get_string('tt_hideglobal', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".$seturl."'".'" /></td>';
 906         $content .= '<td><a href="'.$seturl.'" title="'.get_string('tt_hideglobal', 'calendar').'">'.get_string('global', 'calendar').'</a></td>'."\n";
 907     } else {
 908         $content .= '<td style="width: 11px;"><img src="'.$OUTPUT->pix_url('t/show') . '" class="iconsmall" alt="'.get_string('show').'" title="'.get_string('tt_showglobal', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".$seturl."'".'" /></td>';
 909         $content .= '<td><a href="'.$seturl.'" title="'.get_string('tt_showglobal', 'calendar').'">'.get_string('global', 'calendar').'</a></td>'."\n";
 910     }
 911
 912     $seturl->param('var', 'showcourses');
 913     if (calendar_show_event_type(CALENDAR_EVENT_COURSE)) {
 914         $content .= '<td class="eventskey calendar_event_course" style="width: 11px;"><img src="'.$OUTPUT->pix_url('t/hide') . '" class="iconsmall" alt="'.get_string('hide').'" title="'.get_string('tt_hidecourse', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".$seturl."'".'" /></td>';
 915         $content .= '<td><a href="'.$seturl.'" title="'.get_string('tt_hidecourse', 'calendar').'">'.get_string('course', 'calendar').'</a></td>'."\n";
 916     } else {
 917         $content .= '<td style="width: 11px;"><img src="'.$OUTPUT->pix_url('t/show') . '" class="iconsmall" alt="'.get_string('hide').'" title="'.get_string('tt_showcourse', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".$seturl."'".'" /></td>';
 918         $content .= '<td><a href="'.$seturl.'" title="'.get_string('tt_showcourse', 'calendar').'">'.get_string('course', 'calendar').'</a></td>'."\n";
 919     }
 920
 921     if (isloggedin() && !isguestuser()) {
 922         $content .= "</tr>\n<tr>";
 923
 924         if ($groupevents) {
 925             // This course MIGHT have group events defined, so show the filter
 926             $seturl->param('var', 'showgroups');
 927             if (calendar_show_event_type(CALENDAR_EVENT_GROUP)) {
 928                 $content .= '<td class="eventskey calendar_event_group" style="width: 11px;"><img src="'.$OUTPUT->pix_url('t/hide') . '" class="iconsmall" alt="'.get_string('hide').'" title="'.get_string('tt_hidegroups', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".$seturl."'".'" /></td>';
 929                 $content .= '<td><a href="'.$seturl.'" title="'.get_string('tt_hidegroups', 'calendar').'">'.get_string('group', 'calendar').'</a></td>'."\n";
 930             } else {
 931                 $content .= '<td style="width: 11px;"><img src="'.$OUTPUT->pix_url('t/show') . '" class="iconsmall" alt="'.get_string('show').'" title="'.get_string('tt_showgroups', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".$seturl."'".'" /></td>';
 932                 $content .= '<td><a href="'.$seturl.'" title="'.get_string('tt_showgroups', 'calendar').'">'.get_string('group', 'calendar').'</a></td>'."\n";
 933             }
 934         } else {
 935             // This course CANNOT have group events, so lose the filter
 936             $content .= '<td style="width: 11px;"></td><td>&nbsp;</td>'."\n";
 937         }
 938
 939         $seturl->param('var', 'showuser');
 940         if (calendar_show_event_type(CALENDAR_EVENT_USER)) {
 941             $content .= '<td class="eventskey calendar_event_user" style="width: 11px;"><img src="'.$OUTPUT->pix_url('t/hide') . '" class="iconsmall" alt="'.get_string('hide').'" title="'.get_string('tt_hideuser', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".$seturl."'".'" /></td>';
 942             $content .= '<td><a href="'.$seturl.'" title="'.get_string('tt_hideuser', 'calendar').'">'.get_string('user', 'calendar').'</a></td>'."\n";
 943         } else {
 944             $content .= '<td style="width: 11px;"><img src="'.$OUTPUT->pix_url('t/show') . '" class="iconsmall" alt="'.get_string('show').'" title="'.get_string('tt_showuser', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".$seturl."'".'" /></td>';
 945             $content .= '<td><a href="'.$seturl.'" title="'.get_string('tt_showuser', 'calendar').'">'.get_string('user', 'calendar').'</a></td>'."\n";
 946         }
 947     }
 948     $content .= "</tr>\n</table>\n";
 949
 950     return $content;
 951 }
 952
 953 /**
 954  * Return the representation day
 955  *
 956  * @param int $tstamp Timestamp in GMT
 957  * @param int $now current Unix timestamp
 958  * @param bool $usecommonwords
 959  * @return string the formatted date/time
 960  */
 961 function calendar_day_representation($tstamp, $now = false, $usecommonwords = true) {
 962
 963     static $shortformat;
 964     if(empty($shortformat)) {
 965         $shortformat = get_string('strftimedayshort');
 966     }
 967
 968     if($now === false) {
 969         $now = time();
 970     }
 971
 972     // To have it in one place, if a change is needed
 973     $formal = userdate($tstamp, $shortformat);
 974
 975     $datestamp = usergetdate($tstamp);
 976     $datenow   = usergetdate($now);
 977
 978     if($usecommonwords == false) {
 979         // We don't want words, just a date
 980         return $formal;
 981     }
 982     else if($datestamp['year'] == $datenow['year'] && $datestamp['yday'] == $datenow['yday']) {
 983         // Today
 984         return get_string('today', 'calendar');
 985     }
 986     else if(
 987         ($datestamp['year'] == $datenow['year'] && $datestamp['yday'] == $datenow['yday'] - 1 ) ||
 988         ($datestamp['year'] == $datenow['year'] - 1 && $datestamp['mday'] == 31 && $datestamp['mon'] == 12 && $datenow['yday'] == 1)
 989         ) {
 990         // Yesterday
 991         return get_string('yesterday', 'calendar');
 992     }
 993     else if(
 994         ($datestamp['year'] == $datenow['year'] && $datestamp['yday'] == $datenow['yday'] + 1 ) ||
 995         ($datestamp['year'] == $datenow['year'] + 1 && $datenow['mday'] == 31 && $datenow['mon'] == 12 && $datestamp['yday'] == 1)
 996         ) {
 997         // Tomorrow
 998         return get_string('tomorrow', 'calendar');
 999     }
1000     else {
1001         return $formal;
1002     }
1003 }
1004
1005 /**
1006  * return the formatted representation time
1007  *
1008  * @param int $time the timestamp in UTC, as obtained from the database
1009  * @return string the formatted date/time
1010  */
1011 function calendar_time_representation($time) {
1012     static $langtimeformat = NULL;
1013     if($langtimeformat === NULL) {
1014         $langtimeformat = get_string('strftimetime');
1015     }
1016     $timeformat = get_user_preferences('calendar_timeformat');
1017     if(empty($timeformat)){
1018         $timeformat = get_config(NULL,'calendar_site_timeformat');
1019     }
1020     // The ? is needed because the preference might be present, but empty
1021     return userdate($time, empty($timeformat) ? $langtimeformat : $timeformat);
1022 }
1023
1024 /**
1025  * Adds day, month, year arguments to a URL and returns a moodle_url object.
1026  *
1027  * @param string|moodle_url $linkbase
1028  * @param int $d The number of the day.
1029  * @param int $m The number of the month.
1030  * @param int $y The number of the year.
1031  * @return moodle_url|null $linkbase
1032  */
1033 function calendar_get_link_href($linkbase, $d, $m, $y) {
1034     if (empty($linkbase)) {
1035         return '';
1036     }
1037     if (!($linkbase instanceof moodle_url)) {
1038         $linkbase = new moodle_url();
1039     }
1040     if (!empty($d)) {
1041         $linkbase->param('cal_d', $d);
1042     }
1043     if (!empty($m)) {
1044         $linkbase->param('cal_m', $m);
1045     }
1046     if (!empty($y)) {
1047         $linkbase->param('cal_y', $y);
1048     }
1049     return $linkbase;
1050 }
1051
1052 /**
1053  * Build and return a previous month HTML link, with an arrow.
1054  *
1055  * @param string $text The text label.
1056  * @param string|moodle_url $linkbase The URL stub.
1057  * @param int $d The number of the date.
1058  * @param int $m The number of the month.
1059  * @param int $y year The number of the year.
1060  * @param bool $accesshide Default visible, or hide from all except screenreaders.
1061  * @return string HTML string.
1062  */
1063 function calendar_get_link_previous($text, $linkbase, $d, $m, $y, $accesshide=false) {
1064     $href = calendar_get_link_href(new moodle_url($linkbase), $d, $m, $y);
1065     if (empty($href)) {
1066         return $text;
1067     }
1068     return link_arrow_left($text, (string)$href, $accesshide, 'previous');
1069 }
1070
1071 /**
1072  * Build and return a next month HTML link, with an arrow.
1073  *
1074  * @param string $text The text label.
1075  * @param string|moodle_url $linkbase The URL stub.
1076  * @param int $d the number of the Day
1077  * @param int $m The number of the month.
1078  * @param int $y The number of the year.
1079  * @param bool $accesshide Default visible, or hide from all except screenreaders.
1080  * @return string HTML string.
1081  */
1082 function calendar_get_link_next($text, $linkbase, $d, $m, $y, $accesshide=false) {
1083     $href = calendar_get_link_href(new moodle_url($linkbase), $d, $m, $y);
1084     if (empty($href)) {
1085         return $text;
1086     }
1087     return link_arrow_right($text, (string)$href, $accesshide, 'next');
1088 }
1089
1090 /**
1091  * Return the name of the weekday
1092  *
1093  * @param string $englishname
1094  * @return string of the weekeday
1095  */
1096 function calendar_wday_name($englishname) {
1097     return get_string(strtolower($englishname), 'calendar');
1098 }
1099
1100 /**
1101  * Return the number of days in month
1102  *
1103  * @param int $month the number of the month.
1104  * @param int $year the number of the year
1105  * @return int
1106  */
1107 function calendar_days_in_month($month, $year) {
1108    return intval(date('t', mktime(0, 0, 0, $month, 1, $year)));
1109 }
1110
1111 /**
1112  * Get the upcoming event block
1113  *
1114  * @param array $events list of events
1115  * @param moodle_url|string $linkhref link to event referer
1116  * @return string|null $content html block content
1117  */
1118 function calendar_get_block_upcoming($events, $linkhref = NULL) {
1119     $content = '';
1120     $lines = count($events);
1121     if (!$lines) {
1122         return $content;
1123     }
1124
1125     for ($i = 0; $i < $lines; ++$i) {
1126         if (!isset($events[$i]->time)) {   // Just for robustness
1127             continue;
1128         }
1129         $events[$i] = calendar_add_event_metadata($events[$i]);
1130         $content .= '<div class="event"><span class="icon c0">'.$events[$i]->icon.'</span> ';
1131         if (!empty($events[$i]->referer)) {
1132             // That's an activity event, so let's provide the hyperlink
1133             $content .= $events[$i]->referer;
1134         } else {
1135             if(!empty($linkhref)) {
1136                 $ed = usergetdate($events[$i]->timestart);
1137                 $href = calendar_get_link_href(new moodle_url(CALENDAR_URL.$linkhref), $ed['mday'], $ed['mon'], $ed['year']);
1138                 $href->set_anchor('event_'.$events[$i]->id);
1139                 $content .= html_writer::link($href, $events[$i]->name);
1140             }
1141             else {
1142                 $content .= $events[$i]->name;
1143             }
1144         }
1145         $events[$i]->time = str_replace('&raquo;', '<br />&raquo;', $events[$i]->time);
1146         $content .= '<div class="date">'.$events[$i]->time.'</div></div>';
1147         if ($i < $lines - 1) $content .= '<hr />';
1148     }
1149
1150     return $content;
1151 }
1152
1153 /**
1154  * Get the next following month
1155  *
1156  * If the current month is December, it will get the first month of the following year.
1157  *
1158  *
1159  * @param int $month the number of the month.
1160  * @param int $year the number of the year.
1161  * @return array the following month
1162  */
1163 function calendar_add_month($month, $year) {
1164     if($month == 12) {
1165         return array(1, $year + 1);
1166     }
1167     else {
1168         return array($month + 1, $year);
1169     }
1170 }
1171
1172 /**
1173  * Get the previous month
1174  *
1175  * If the current month is January, it will get the last month of the previous year.
1176  *
1177  * @param int $month the number of the month.
1178  * @param int $year the number of the year.
1179  * @return array previous month
1180  */
1181 function calendar_sub_month($month, $year) {
1182     if($month == 1) {
1183         return array(12, $year - 1);
1184     }
1185     else {
1186         return array($month - 1, $year);
1187     }
1188 }
1189
1190 /**
1191  * Get per-day basis events
1192  *
1193  * @param array $events list of events
1194  * @param int $month the number of the month
1195  * @param int $year the number of the year
1196  * @param array $eventsbyday event on specific day
1197  * @param array $durationbyday duration of the event in days
1198  * @param array $typesbyday event type (eg: global, course, user, or group)
1199  * @param array $courses list of courses
1200  * @return void
1201  */
1202 function calendar_events_by_day($events, $month, $year, &$eventsbyday, &$durationbyday, &$typesbyday, &$courses) {
1203     $eventsbyday = array();
1204     $typesbyday = array();
1205     $durationbyday = array();
1206
1207     if($events === false) {
1208         return;
1209     }
1210
1211     foreach($events as $event) {
1212
1213         $startdate = usergetdate($event->timestart);
1214         // Set end date = start date if no duration
1215         if ($event->timeduration) {
1216             $enddate   = usergetdate($event->timestart + $event->timeduration - 1);
1217         } else {
1218             $enddate = $startdate;
1219         }
1220
1221         // Simple arithmetic: $year * 13 + $month is a distinct integer for each distinct ($year, $month) pair
1222         if(!($startdate['year'] * 13 + $startdate['mon'] <= $year * 13 + $month) && ($enddate['year'] * 13 + $enddate['mon'] >= $year * 13 + $month)) {
1223             // Out of bounds
1224             continue;
1225         }
1226
1227         $eventdaystart = intval($startdate['mday']);
1228
1229         if($startdate['mon'] == $month && $startdate['year'] == $year) {
1230             // Give the event to its day
1231             $eventsbyday[$eventdaystart][] = $event->id;
1232
1233             // Mark the day as having such an event
1234             if($event->courseid == SITEID && $event->groupid == 0) {
1235                 $typesbyday[$eventdaystart]['startglobal'] = true;
1236                 // Set event class for global event
1237                 $events[$event->id]->class = 'calendar_event_global';
1238             }
1239             else if($event->courseid != 0 && $event->courseid != SITEID && $event->groupid == 0) {
1240                 $typesbyday[$eventdaystart]['startcourse'] = true;
1241                 // Set event class for course event
1242                 $events[$event->id]->class = 'calendar_event_course';
1243             }
1244             else if($event->groupid) {
1245                 $typesbyday[$eventdaystart]['startgroup'] = true;
1246                 // Set event class for group event
1247                 $events[$event->id]->class = 'calendar_event_group';
1248             }
1249             else if($event->userid) {
1250                 $typesbyday[$eventdaystart]['startuser'] = true;
1251                 // Set event class for user event
1252                 $events[$event->id]->class = 'calendar_event_user';
1253             }
1254         }
1255
1256         if($event->timeduration == 0) {
1257             // Proceed with the next
1258             continue;
1259         }
1260
1261         // The event starts on $month $year or before. So...
1262         $lowerbound = $startdate['mon'] == $month && $startdate['year'] == $year ? intval($startdate['mday']) : 0;
1263
1264         // Also, it ends on $month $year or later...
1265         $upperbound = $enddate['mon'] == $month && $enddate['year'] == $year ? intval($enddate['mday']) : calendar_days_in_month($month, $year);
1266
1267         // Mark all days between $lowerbound and $upperbound (inclusive) as duration
1268         for($i = $lowerbound + 1; $i <= $upperbound; ++$i) {
1269             $durationbyday[$i][] = $event->id;
1270             if($event->courseid == SITEID && $event->groupid == 0) {
1271                 $typesbyday[$i]['durationglobal'] = true;
1272             }
1273             else if($event->courseid != 0 && $event->courseid != SITEID && $event->groupid == 0) {
1274                 $typesbyday[$i]['durationcourse'] = true;
1275             }
1276             else if($event->groupid) {
1277                 $typesbyday[$i]['durationgroup'] = true;
1278             }
1279             else if($event->userid) {
1280                 $typesbyday[$i]['durationuser'] = true;
1281             }
1282         }
1283
1284     }
1285     return;
1286 }
1287
1288 /**
1289  * Get current module cache
1290  *
1291  * @param array $coursecache list of course cache
1292  * @param string $modulename name of the module
1293  * @param int $instance module instance number
1294  * @return stdClass|bool $module information
1295  */
1296 function calendar_get_module_cached(&$coursecache, $modulename, $instance) {
1297     $module = get_coursemodule_from_instance($modulename, $instance);
1298
1299     if($module === false) return false;
1300     if(!calendar_get_course_cached($coursecache, $module->course)) {
1301         return false;
1302     }
1303     return $module;
1304 }
1305
1306 /**
1307  * Get current course cache
1308  *
1309  * @param array $coursecache list of course cache
1310  * @param int $courseid id of the course
1311  * @return stdClass $coursecache[$courseid] return the specific course cache
1312  */
1313 function calendar_get_course_cached(&$coursecache, $courseid) {
1314     global $COURSE, $DB;
1315
1316     if (!isset($coursecache[$courseid])) {
1317         if ($courseid == $COURSE->id) {
1318             $coursecache[$courseid] = $COURSE;
1319         } else {
1320             $coursecache[$courseid] = $DB->get_record('course', array('id'=>$courseid));
1321         }
1322     }
1323     return $coursecache[$courseid];
1324 }
1325
1326 /**
1327  * Returns the courses to load events for, the
1328  *
1329  * @param array $courseeventsfrom An array of courses to load calendar events for
1330  * @param bool $ignorefilters specify the use of filters, false is set as default
1331  * @return array An array of courses, groups, and user to load calendar events for based upon filters
1332  */
1333 function calendar_set_filters(array $courseeventsfrom, $ignorefilters = false) {
1334     global $USER, $CFG, $DB;
1335
1336     // For backwards compatability we have to check whether the courses array contains
1337     // just id's in which case we need to load course objects.
1338     $coursestoload = array();
1339     foreach ($courseeventsfrom as $id => $something) {
1340         if (!is_object($something)) {
1341             $coursestoload[] = $id;
1342             unset($courseeventsfrom[$id]);
1343         }
1344     }
1345     if (!empty($coursestoload)) {
1346         // TODO remove this in 2.2
1347         debugging('calendar_set_filters now preferes an array of course objects with preloaded contexts', DEBUG_DEVELOPER);
1348         $courseeventsfrom = array_merge($courseeventsfrom, $DB->get_records_list('course', 'id', $coursestoload));
1349     }
1350
1351     $courses = array();
1352     $user = false;
1353     $group = false;
1354
1355     // capabilities that allow seeing group events from all groups
1356     // TODO: rewrite so that moodle/calendar:manageentries is not necessary here
1357     $allgroupscaps = array('moodle/site:accessallgroups', 'moodle/calendar:manageentries');
1358
1359     $isloggedin = isloggedin();
1360
1361     if ($ignorefilters || calendar_show_event_type(CALENDAR_EVENT_COURSE)) {
1362         $courses = array_keys($courseeventsfrom);
1363     }
1364     if ($ignorefilters || calendar_show_event_type(CALENDAR_EVENT_GLOBAL)) {
1365         $courses[] = SITEID;
1366     }
1367     $courses = array_unique($courses);
1368     sort($courses);
1369
1370     if (!empty($courses) && in_array(SITEID, $courses)) {
1371         // Sort courses for consistent colour highlighting
1372         // Effectively ignoring SITEID as setting as last course id
1373         $key = array_search(SITEID, $courses);
1374         unset($courses[$key]);
1375         $courses[] = SITEID;
1376     }
1377
1378     if ($ignorefilters || ($isloggedin && calendar_show_event_type(CALENDAR_EVENT_USER))) {
1379         $user = $USER->id;
1380     }
1381
1382     if (!empty($courseeventsfrom) && (calendar_show_event_type(CALENDAR_EVENT_GROUP) || $ignorefilters)) {
1383
1384         if (count($courseeventsfrom)==1) {
1385             $course = reset($courseeventsfrom);
1386             if (has_any_capability($allgroupscaps, get_context_instance(CONTEXT_COURSE, $course->id))) {
1387                 $coursegroups = groups_get_all_groups($course->id, 0, 0, 'g.id');
1388                 $group = array_keys($coursegroups);
1389             }
1390         }
1391         if ($group === false) {
1392             if (!empty($CFG->calendar_adminseesall) && has_any_capability($allgroupscaps, get_system_context())) {
1393                 $group = true;
1394             } else if ($isloggedin) {
1395                 $groupids = array();
1396
1397                 // We already have the courses to examine in $courses
1398                 // For each course...
1399                 foreach ($courseeventsfrom as $courseid => $course) {
1400                     // If the user is an editing teacher in there,
1401                     if (!empty($USER->groupmember[$course->id])) {
1402                         // We've already cached the users groups for this course so we can just use that
1403                         $groupids = array_merge($groupids, $USER->groupmember[$course->id]);
1404                     } else if ($course->groupmode != NOGROUPS || !$course->groupmodeforce) {
1405                         // If this course has groups, show events from all of those related to the current user
1406                         $coursegroups = groups_get_user_groups($course->id, $USER->id);
1407                         $groupids = array_merge($groupids, $coursegroups['0']);
1408                     }
1409                 }
1410                 if (!empty($groupids)) {
1411                     $group = $groupids;
1412                 }
1413             }
1414         }
1415     }
1416     if (empty($courses)) {
1417         $courses = false;
1418     }
1419
1420     return array($courses, $group, $user);
1421 }
1422
1423 /**
1424  * Return the capability for editing calendar event
1425  *
1426  * @param calendar_event $event event object
1427  * @return bool capability to edit event
1428  */
1429 function calendar_edit_event_allowed($event) {
1430     global $USER, $DB;
1431
1432     // Must be logged in
1433     if (!isloggedin()) {
1434         return false;
1435     }
1436
1437     // can not be using guest account
1438     if (isguestuser()) {
1439         return false;
1440     }
1441
1442     $sitecontext = get_context_instance(CONTEXT_SYSTEM);
1443     // if user has manageentries at site level, return true
1444     if (has_capability('moodle/calendar:manageentries', $sitecontext)) {
1445         return true;
1446     }
1447
1448     // if groupid is set, it's definitely a group event
1449     if (!empty($event->groupid)) {
1450         // Allow users to add/edit group events if:
1451         // 1) They have manageentries (= entries for whole course)
1452         // 2) They have managegroupentries AND are in the group
1453         $group = $DB->get_record('groups', array('id'=>$event->groupid));
1454         return $group && (
1455             has_capability('moodle/calendar:manageentries', $event->context) ||
1456             (has_capability('moodle/calendar:managegroupentries', $event->context)
1457                 && groups_is_member($event->groupid)));
1458     } else if (!empty($event->courseid)) {
1459     // if groupid is not set, but course is set,
1460     // it's definiely a course event
1461         return has_capability('moodle/calendar:manageentries', $event->context);
1462     } else if (!empty($event->userid) && $event->userid == $USER->id) {
1463     // if course is not set, but userid id set, it's a user event
1464         return (has_capability('moodle/calendar:manageownentries', $event->context));
1465     } else if (!empty($event->userid)) {
1466         return (has_capability('moodle/calendar:manageentries', $event->context));
1467     }
1468     return false;
1469 }
1470
1471 /**
1472  * Returns the default courses to display on the calendar when there isn't a specific
1473  * course to display.
1474  *
1475  * @return array $courses Array of courses to display
1476  */
1477 function calendar_get_default_courses() {
1478     global $CFG, $DB;
1479
1480     if (!isloggedin()) {
1481         return array();
1482     }
1483
1484     $courses = array();
1485     if (!empty($CFG->calendar_adminseesall) && has_capability('moodle/calendar:manageentries', context_system::instance())) {
1486         list ($select, $join) = context_instance_preload_sql('c.id', CONTEXT_COURSE, 'ctx');
1487         $sql = "SELECT c.* $select
1488                   FROM {course} c
1489                   $join
1490                   WHERE EXISTS (SELECT 1 FROM {event} e WHERE e.courseid = c.id)
1491                   ";
1492         $courses = $DB->get_records_sql($sql, null, 0, 20);
1493         foreach ($courses as $course) {
1494             context_helper::preload_from_record($course);
1495         }
1496         return $courses;
1497     }
1498
1499     $courses = enrol_get_my_courses();
1500
1501     return $courses;
1502 }
1503
1504 /**
1505  * Display calendar preference button
1506  *
1507  * @param stdClass $course course object
1508  * @return string return preference button in html
1509  */
1510 function calendar_preferences_button(stdClass $course) {
1511     global $OUTPUT;
1512
1513     // Guests have no preferences
1514     if (!isloggedin() || isguestuser()) {
1515         return '';
1516     }
1517
1518     return $OUTPUT->single_button(new moodle_url('/calendar/preferences.php', array('course' => $course->id)), get_string("preferences", "calendar"));
1519 }
1520
1521 /**
1522  * Get event format time
1523  *
1524  * @param calendar_event $event event object
1525  * @param int $now current time in gmt
1526  * @param array $linkparams list of params for event link
1527  * @param bool $usecommonwords the words as formatted date/time.
1528  * @param int $showtime determine the show time GMT timestamp
1529  * @return string $eventtime link/string for event time
1530  */
1531 function calendar_format_event_time($event, $now, $linkparams = null, $usecommonwords = true, $showtime=0) {
1532     $startdate = usergetdate($event->timestart);
1533     $enddate = usergetdate($event->timestart + $event->timeduration);
1534     $usermidnightstart = usergetmidnight($event->timestart);
1535
1536     if($event->timeduration) {
1537         // To avoid doing the math if one IF is enough :)
1538         $usermidnightend = usergetmidnight($event->timestart + $event->timeduration);
1539     }
1540     else {
1541         $usermidnightend = $usermidnightstart;
1542     }
1543
1544     if (empty($linkparams) || !is_array($linkparams)) {
1545         $linkparams = array();
1546     }
1547     $linkparams['view'] = 'day';
1548
1549     // OK, now to get a meaningful display...
1550     // First of all we have to construct a human-readable date/time representation
1551
1552     if($event->timeduration) {
1553         // It has a duration
1554         if($usermidnightstart == $usermidnightend ||
1555            ($event->timestart == $usermidnightstart) && ($event->timeduration == 86400 || $event->timeduration == 86399) ||
1556            ($event->timestart + $event->timeduration <= $usermidnightstart + 86400)) {
1557             // But it's all on the same day
1558             $timestart = calendar_time_representation($event->timestart);
1559             $timeend = calendar_time_representation($event->timestart + $event->timeduration);
1560             $time = $timestart.' <strong>&raquo;</strong> '.$timeend;
1561
1562             if ($event->timestart == $usermidnightstart && ($event->timeduration == 86400 || $event->timeduration == 86399)) {
1563                 $time = get_string('allday', 'calendar');
1564             }
1565
1566             // Set printable representation
1567             if (!$showtime) {
1568                 $day = calendar_day_representation($event->timestart, $now, $usecommonwords);
1569                 $url = calendar_get_link_href(new moodle_url(CALENDAR_URL.'view.php', $linkparams), $enddate['mday'], $enddate['mon'], $enddate['year']);
1570                 $eventtime = html_writer::link($url, $day).', '.$time;
1571             } else {
1572                 $eventtime = $time;
1573             }
1574         } else {
1575             // It spans two or more days
1576             $daystart = calendar_day_representation($event->timestart, $now, $usecommonwords).', ';
1577             if ($showtime == $usermidnightstart) {
1578                 $daystart = '';
1579             }
1580             $timestart = calendar_time_representation($event->timestart);
1581             $dayend = calendar_day_representation($event->timestart + $event->timeduration, $now, $usecommonwords).', ';
1582             if ($showtime == $usermidnightend) {
1583                 $dayend = '';
1584             }
1585             $timeend = calendar_time_representation($event->timestart + $event->timeduration);
1586
1587             // Set printable representation
1588             if ($now >= $usermidnightstart && $now < ($usermidnightstart + 86400)) {
1589                 $url = calendar_get_link_href(new moodle_url(CALENDAR_URL.'view.php', $linkparams), $enddate['mday'], $enddate['mon'], $enddate['year']);
1590                 $eventtime = $timestart.' <strong>&raquo;</strong> '.html_writer::link($url, $dayend).$timeend;
1591             } else {
1592                 $url = calendar_get_link_href(new moodle_url(CALENDAR_URL.'view.php', $linkparams), $enddate['mday'], $enddate['mon'], $enddate['year']);
1593                 $eventtime  = html_writer::link($url, $daystart).$timestart.' <strong>&raquo;</strong> ';
1594
1595                 $url = calendar_get_link_href(new moodle_url(CALENDAR_URL.'view.php', $linkparams), $startdate['mday'], $startdate['mon'], $startdate['year']);
1596                 $eventtime .= html_writer::link($url, $dayend).$timeend;
1597             }
1598         }
1599     } else {
1600         $time = calendar_time_representation($event->timestart);
1601
1602         // Set printable representation
1603         if (!$showtime) {
1604             $day = calendar_day_representation($event->timestart, $now, $usecommonwords);
1605             $url = calendar_get_link_href(new moodle_url(CALENDAR_URL.'view.php', $linkparams), $startdate['mday'], $startdate['mon'], $startdate['year']);
1606             $eventtime = html_writer::link($url, $day).', '.trim($time);
1607         } else {
1608             $eventtime = $time;
1609         }
1610     }
1611
1612     if($event->timestart + $event->timeduration < $now) {
1613         // It has expired
1614         $eventtime = '<span class="dimmed_text">'.str_replace(' href=', ' class="dimmed" href=', $eventtime).'</span>';
1615     }
1616
1617     return $eventtime;
1618 }
1619
1620 /**
1621  * Display month selector options
1622  *
1623  * @param string $name for the select element
1624  * @param string|array $selected options for select elements
1625  */
1626 function calendar_print_month_selector($name, $selected) {
1627     $months = array();
1628     for ($i=1; $i<=12; $i++) {
1629         $months[$i] = userdate(gmmktime(12, 0, 0, $i, 15, 2000), '%B');
1630     }
1631     echo html_writer::label(get_string('months'), 'menu'. $name, false, array('class' => 'accesshide'));
1632     echo html_writer::select($months, $name, $selected, false);
1633 }
1634
1635 /**
1636  * Checks to see if the requested type of event should be shown for the given user.
1637  *
1638  * @param CALENDAR_EVENT_GLOBAL|CALENDAR_EVENT_COURSE|CALENDAR_EVENT_GROUP|CALENDAR_EVENT_USER $type
1639  *          The type to check the display for (default is to display all)
1640  * @param stdClass|int|null $user The user to check for - by default the current user
1641  * @return bool True if the tyep should be displayed false otherwise
1642  */
1643 function calendar_show_event_type($type, $user = null) {
1644     $default = CALENDAR_EVENT_GLOBAL + CALENDAR_EVENT_COURSE + CALENDAR_EVENT_GROUP + CALENDAR_EVENT_USER;
1645     if (get_user_preferences('calendar_persistflt', 0, $user) === 0) {
1646         global $SESSION;
1647         if (!isset($SESSION->calendarshoweventtype)) {
1648             $SESSION->calendarshoweventtype = $default;
1649         }
1650         return $SESSION->calendarshoweventtype & $type;
1651     } else {
1652         return get_user_preferences('calendar_savedflt', $default, $user) & $type;
1653     }
1654 }
1655
1656 /**
1657  * Sets the display of the event type given $display.
1658  *
1659  * If $display = true the event type will be shown.
1660  * If $display = false the event type will NOT be shown.
1661  * If $display = null the current value will be toggled and saved.
1662  *
1663  * @param CALENDAR_EVENT_GLOBAL|CALENDAR_EVENT_COURSE|CALENDAR_EVENT_GROUP|CALENDAR_EVENT_USER $type object of CALENDAR_EVENT_XXX
1664  * @param bool $display option to display event type
1665  * @param stdClass|int $user moodle user object or id, null means current user
1666  */
1667 function calendar_set_event_type_display($type, $display = null, $user = null) {
1668     $persist = get_user_preferences('calendar_persistflt', 0, $user);
1669     $default = CALENDAR_EVENT_GLOBAL + CALENDAR_EVENT_COURSE + CALENDAR_EVENT_GROUP + CALENDAR_EVENT_USER;
1670     if ($persist === 0) {
1671         global $SESSION;
1672         if (!isset($SESSION->calendarshoweventtype)) {
1673             $SESSION->calendarshoweventtype = $default;
1674         }
1675         $preference = $SESSION->calendarshoweventtype;
1676     } else {
1677         $preference = get_user_preferences('calendar_savedflt', $default, $user);
1678     }
1679     $current = $preference & $type;
1680     if ($display === null) {
1681         $display = !$current;
1682     }
1683     if ($display && !$current) {
1684         $preference += $type;
1685     } else if (!$display && $current) {
1686         $preference -= $type;
1687     }
1688     if ($persist === 0) {
1689         $SESSION->calendarshoweventtype = $preference;
1690     } else {
1691         if ($preference == $default) {
1692             unset_user_preference('calendar_savedflt', $user);
1693         } else {
1694             set_user_preference('calendar_savedflt', $preference, $user);
1695         }
1696     }
1697 }
1698
1699 /**
1700  * Get calendar's allowed types
1701  *
1702  * @param stdClass $allowed list of allowed edit for event  type
1703  * @param stdClass|int $course object of a course or course id
1704  */
1705 function calendar_get_allowed_types(&$allowed, $course = null) {
1706     global $USER, $CFG, $DB;
1707     $allowed = new stdClass();
1708     $allowed->user = has_capability('moodle/calendar:manageownentries', get_system_context());
1709     $allowed->groups = false; // This may change just below
1710     $allowed->courses = false; // This may change just below
1711     $allowed->site = has_capability('moodle/calendar:manageentries', get_context_instance(CONTEXT_COURSE, SITEID));
1712
1713     if (!empty($course)) {
1714         if (!is_object($course)) {
1715             $course = $DB->get_record('course', array('id' => $course), '*', MUST_EXIST);
1716         }
1717         if ($course->id != SITEID) {
1718             $coursecontext = get_context_instance(CONTEXT_COURSE, $course->id);
1719             $allowed->user = has_capability('moodle/calendar:manageownentries', $coursecontext);
1720
1721             if (has_capability('moodle/calendar:manageentries', $coursecontext)) {
1722                 $allowed->courses = array($course->id => 1);
1723
1724                 if ($course->groupmode != NOGROUPS || !$course->groupmodeforce) {
1725                     if (has_capability('moodle/site:accessallgroups', $coursecontext)) {
1726                         $allowed->groups = groups_get_all_groups($course->id);
1727                     } else {
1728                         $allowed->groups = groups_get_all_groups($course->id, $USER->id);
1729                     }
1730                 }
1731             } else if (has_capability('moodle/calendar:managegroupentries', $coursecontext)) {
1732                 if($course->groupmode != NOGROUPS || !$course->groupmodeforce) {
1733                     if (has_capability('moodle/site:accessallgroups', $coursecontext)) {
1734                         $allowed->groups = groups_get_all_groups($course->id);
1735                     } else {
1736                         $allowed->groups = groups_get_all_groups($course->id, $USER->id);
1737                     }
1738                 }
1739             }
1740         }
1741     }
1742 }
1743
1744 /**
1745  * See if user can add calendar entries at all
1746  * used to print the "New Event" button
1747  *
1748  * @param stdClass $course object of a course or course id
1749  * @return bool has the capability to add at least one event type
1750  */
1751 function calendar_user_can_add_event($course) {
1752     if (!isloggedin() || isguestuser()) {
1753         return false;
1754     }
1755     calendar_get_allowed_types($allowed, $course);
1756     return (bool)($allowed->user || $allowed->groups || $allowed->courses || $allowed->site);
1757 }
1758
1759 /**
1760  * Check wether the current user is permitted to add events
1761  *
1762  * @param stdClass $event object of event
1763  * @return bool has the capability to add event
1764  */
1765 function calendar_add_event_allowed($event) {
1766     global $USER, $DB;
1767
1768     // can not be using guest account
1769     if (!isloggedin() or isguestuser()) {
1770         return false;
1771     }
1772
1773     $sitecontext = get_context_instance(CONTEXT_SYSTEM);
1774     // if user has manageentries at site level, always return true
1775     if (has_capability('moodle/calendar:manageentries', $sitecontext)) {
1776         return true;
1777     }
1778
1779     switch ($event->eventtype) {
1780         case 'course':
1781             return has_capability('moodle/calendar:manageentries', $event->context);
1782
1783         case 'group':
1784             // Allow users to add/edit group events if:
1785             // 1) They have manageentries (= entries for whole course)
1786             // 2) They have managegroupentries AND are in the group
1787             $group = $DB->get_record('groups', array('id'=>$event->groupid));
1788             return $group && (
1789                 has_capability('moodle/calendar:manageentries', $event->context) ||
1790                 (has_capability('moodle/calendar:managegroupentries', $event->context)
1791                     && groups_is_member($event->groupid)));
1792
1793         case 'user':
1794             if ($event->userid == $USER->id) {
1795                 return (has_capability('moodle/calendar:manageownentries', $event->context));
1796             }
1797             //there is no 'break;' intentionally
1798
1799         case 'site':
1800             return has_capability('moodle/calendar:manageentries', $event->context);
1801
1802         default:
1803             return has_capability('moodle/calendar:manageentries', $event->context);
1804     }
1805 }
1806
1807 /**
1808  * Manage calendar events
1809  *
1810  * This class provides the required functionality in order to manage calendar events.
1811  * It was introduced as part of Moodle 2.0 and was created in order to provide a
1812  * better framework for dealing with calendar events in particular regard to file
1813  * handling through the new file API
1814  *
1815  * @package    core_calendar
1816  * @category   calendar
1817  * @copyright  2009 Sam Hemelryk
1818  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
1819  *
1820  * @property int $id The id within the event table
1821  * @property string $name The name of the event
1822  * @property string $description The description of the event
1823  * @property int $format The format of the description FORMAT_?
1824  * @property int $courseid The course the event is associated with (0 if none)
1825  * @property int $groupid The group the event is associated with (0 if none)
1826  * @property int $userid The user the event is associated with (0 if none)
1827  * @property int $repeatid If this is a repeated event this will be set to the
1828  *                          id of the original
1829  * @property string $modulename If added by a module this will be the module name
1830  * @property int $instance If added by a module this will be the module instance
1831  * @property string $eventtype The event type
1832  * @property int $timestart The start time as a timestamp
1833  * @property int $timeduration The duration of the event in seconds
1834  * @property int $visible 1 if the event is visible
1835  * @property int $uuid ?
1836  * @property int $sequence ?
1837  * @property int $timemodified The time last modified as a timestamp
1838  */
1839 class calendar_event {
1840
1841     /** @var array An object containing the event properties can be accessed via the magic __get/set methods */
1842     protected $properties = null;
1843
1844     /**
1845      * @var string The converted event discription with file paths resolved. This gets populated when someone requests description for the first time */
1846     protected $_description = null;
1847
1848     /** @var array The options to use with this description editor */
1849     protected $editoroptions = array(
1850             'subdirs'=>false,
1851             'forcehttps'=>false,
1852             'maxfiles'=>-1,
1853             'maxbytes'=>null,
1854             'trusttext'=>false);
1855
1856     /** @var object The context to use with the description editor */
1857     protected $editorcontext = null;
1858
1859     /**
1860      * Instantiates a new event and optionally populates its properties with the
1861      * data provided
1862      *
1863      * @param stdClass $data Optional. An object containing the properties to for
1864      *                  an event
1865      */
1866     public function __construct($data=null) {
1867         global $CFG, $USER;
1868
1869         // First convert to object if it is not already (should either be object or assoc array)
1870         if (!is_object($data)) {
1871             $data = (object)$data;
1872         }
1873
1874         $this->editoroptions['maxbytes'] = $CFG->maxbytes;
1875
1876         $data->eventrepeats = 0;
1877
1878         if (empty($data->id)) {
1879             $data->id = null;
1880         }
1881
1882         // Default to a user event
1883         if (empty($data->eventtype)) {
1884             $data->eventtype = 'user';
1885         }
1886
1887         // Default to the current user
1888         if (empty($data->userid)) {
1889             $data->userid = $USER->id;
1890         }
1891
1892         if (!empty($data->timeduration) && is_array($data->timeduration)) {
1893             $data->timeduration = make_timestamp($data->timeduration['year'], $data->timeduration['month'], $data->timeduration['day'], $data->timeduration['hour'], $data->timeduration['minute']) - $data->timestart;
1894         }
1895         if (!empty($data->description) && is_array($data->description)) {
1896             $data->format = $data->description['format'];
1897             $data->description = $data->description['text'];
1898         } else if (empty($data->description)) {
1899             $data->description = '';
1900             $data->format = editors_get_preferred_format();
1901         }
1902         // Ensure form is defaulted correctly
1903         if (empty($data->format)) {
1904             $data->format = editors_get_preferred_format();
1905         }
1906
1907         if (empty($data->context)) {
1908             $data->context = $this->calculate_context($data);
1909         }
1910         $this->properties = $data;
1911     }
1912
1913     /**
1914      * Magic property method
1915      *
1916      * Attempts to call a set_$key method if one exists otherwise falls back
1917      * to simply set the property
1918      *
1919      * @param string $key property name
1920      * @param mixed $value value of the property
1921      */
1922     public function __set($key, $value) {
1923         if (method_exists($this, 'set_'.$key)) {
1924             $this->{'set_'.$key}($value);
1925         }
1926         $this->properties->{$key} = $value;
1927     }
1928
1929     /**
1930      * Magic get method
1931      *
1932      * Attempts to call a get_$key method to return the property and ralls over
1933      * to return the raw property
1934      *
1935      * @param string $key property name
1936      * @return mixed property value
1937      */
1938     public function __get($key) {
1939         if (method_exists($this, 'get_'.$key)) {
1940             return $this->{'get_'.$key}();
1941         }
1942         if (!isset($this->properties->{$key})) {
1943             throw new coding_exception('Undefined property requested');
1944         }
1945         return $this->properties->{$key};
1946     }
1947
1948     /**
1949      * Stupid PHP needs an isset magic method if you use the get magic method and
1950      * still want empty calls to work.... blah ~!
1951      *
1952      * @param string $key $key property name
1953      * @return bool|mixed property value, false if property is not exist
1954      */
1955     public function __isset($key) {
1956         return !empty($this->properties->{$key});
1957     }
1958
1959     /**
1960      * Calculate the context value needed for calendar_event.
1961      * Event's type can be determine by the available value store in $data
1962      * It is important to check for the existence of course/courseid to determine
1963      * the course event.
1964      * Default value is set to CONTEXT_USER
1965      *
1966      * @param stdClass $data information about event
1967      * @return stdClass The context object.
1968      */
1969     protected function calculate_context(stdClass $data) {
1970         global $USER, $DB;
1971
1972         $context = null;
1973         if (isset($data->courseid) && $data->courseid > 0) {
1974             $context =  get_context_instance(CONTEXT_COURSE, $data->courseid);
1975         } else if (isset($data->course) && $data->course > 0) {
1976             $context =  get_context_instance(CONTEXT_COURSE, $data->course);
1977         } else if (isset($data->groupid) && $data->groupid > 0) {
1978             $group = $DB->get_record('groups', array('id'=>$data->groupid));
1979             $context = get_context_instance(CONTEXT_COURSE, $group->courseid);
1980         } else if (isset($data->userid) && $data->userid > 0 && $data->userid == $USER->id) {
1981             $context =  get_context_instance(CONTEXT_USER, $data->userid);
1982         } else if (isset($data->userid) && $data->userid > 0 && $data->userid != $USER->id &&
1983                    isset($data->instance) && $data->instance > 0) {
1984             $cm = get_coursemodule_from_instance($data->modulename, $data->instance, 0, false, MUST_EXIST);
1985             $context =  get_context_instance(CONTEXT_COURSE, $cm->course);
1986         } else {
1987             $context =  get_context_instance(CONTEXT_USER);
1988         }
1989
1990         return $context;
1991     }
1992
1993     /**
1994      * Returns an array of editoroptions for this event: Called by __get
1995      * Please use $blah = $event->editoroptions;
1996      *
1997      * @return array event editor options
1998      */
1999     protected function get_editoroptions() {
2000         return $this->editoroptions;
2001     }
2002
2003     /**
2004      * Returns an event description: Called by __get
2005      * Please use $blah = $event->description;
2006      *
2007      * @return string event description
2008      */
2009     protected function get_description() {
2010         global $CFG;
2011
2012         require_once($CFG->libdir . '/filelib.php');
2013
2014         if ($this->_description === null) {
2015             // Check if we have already resolved the context for this event
2016             if ($this->editorcontext === null) {
2017                 // Switch on the event type to decide upon the appropriate context
2018                 // to use for this event
2019                 $this->editorcontext = $this->properties->context;
2020                 if ($this->properties->eventtype != 'user' && $this->properties->eventtype != 'course'
2021                         && $this->properties->eventtype != 'site' && $this->properties->eventtype != 'group') {
2022                     return clean_text($this->properties->description, $this->properties->format);
2023                 }
2024             }
2025
2026             // Work out the item id for the editor, if this is a repeated event then the files will
2027             // be associated with the original
2028             if (!empty($this->properties->repeatid) && $this->properties->repeatid > 0) {
2029                 $itemid = $this->properties->repeatid;
2030             } else {
2031                 $itemid = $this->properties->id;
2032             }
2033
2034             // Convert file paths in the description so that things display correctly
2035             $this->_description = file_rewrite_pluginfile_urls($this->properties->description, 'pluginfile.php', $this->editorcontext->id, 'calendar', 'event_description', $itemid);
2036             // Clean the text so no nasties get through
2037             $this->_description = clean_text($this->_description, $this->properties->format);
2038         }
2039         // Finally return the description
2040         return $this->_description;
2041     }
2042
2043     /**
2044      * Return the number of repeat events there are in this events series
2045      *
2046      * @return int number of event repeated
2047      */
2048     public function count_repeats() {
2049         global $DB;
2050         if (!empty($this->properties->repeatid)) {
2051             $this->properties->eventrepeats = $DB->count_records('event', array('repeatid'=>$this->properties->repeatid));
2052             // We don't want to count ourselves
2053             $this->properties->eventrepeats--;
2054         }
2055         return $this->properties->eventrepeats;
2056     }
2057
2058     /**
2059      * Update or create an event within the database
2060      *
2061      * Pass in a object containing the event properties and this function will
2062      * insert it into the database and deal with any associated files
2063      *
2064      * @see add_event()
2065      * @see update_event()
2066      *
2067      * @param stdClass $data object of event
2068      * @param bool $checkcapability if moodle should check calendar managing capability or not
2069      * @return bool event updated
2070      */
2071     public function update($data, $checkcapability=true) {
2072         global $CFG, $DB, $USER;
2073
2074         foreach ($data as $key=>$value) {
2075             $this->properties->$key = $value;
2076         }
2077
2078         $this->properties->timemodified = time();
2079         $usingeditor = (!empty($this->properties->description) && is_array($this->properties->description));
2080
2081         if (empty($this->properties->id) || $this->properties->id < 1) {
2082
2083             if ($checkcapability) {
2084                 if (!calendar_add_event_allowed($this->properties)) {
2085                     print_error('nopermissiontoupdatecalendar');
2086                 }
2087             }
2088
2089             if ($usingeditor) {
2090                 switch ($this->properties->eventtype) {
2091                     case 'user':
2092                         $this->properties->courseid = 0;
2093                         $this->properties->course = 0;
2094                         $this->properties->groupid = 0;
2095                         $this->properties->userid = $USER->id;
2096                         break;
2097                     case 'site':
2098                         $this->properties->courseid = SITEID;
2099                         $this->properties->course = SITEID;
2100                         $this->properties->groupid = 0;
2101                         $this->properties->userid = $USER->id;
2102                         break;
2103                     case 'course':
2104                         $this->properties->groupid = 0;
2105                         $this->properties->userid = $USER->id;
2106                         break;
2107                     case 'group':
2108                         $this->properties->userid = $USER->id;
2109                         break;
2110                     default:
2111                         // Ewww we should NEVER get here, but just incase we do lets
2112                         // fail gracefully
2113                         $usingeditor = false;
2114                         break;
2115                 }
2116
2117                 // If we are actually using the editor, we recalculate the context because some default values
2118                 // were set when calculate_context() was called from the constructor.
2119                 if ($usingeditor) {
2120                     $this->properties->context = $this->calculate_context($this->properties);
2121                     $this->editorcontext = $this->properties->context;
2122                 }
2123
2124                 $editor = $this->properties->description;
2125                 $this->properties->format = $this->properties->description['format'];
2126                 $this->properties->description = $this->properties->description['text'];
2127             }
2128
2129             // Insert the event into the database
2130             $this->properties->id = $DB->insert_record('event', $this->properties);
2131
2132             if ($usingeditor) {
2133                 $this->properties->description = file_save_draft_area_files(
2134                                                 $editor['itemid'],
2135                                                 $this->editorcontext->id,
2136                                                 'calendar',
2137                                                 'event_description',
2138                                                 $this->properties->id,
2139                                                 $this->editoroptions,
2140                                                 $editor['text'],
2141                                                 $this->editoroptions['forcehttps']);
2142                 $DB->set_field('event', 'description', $this->properties->description, array('id'=>$this->properties->id));
2143             }
2144
2145             // Log the event entry.
2146             add_to_log($this->properties->courseid, 'calendar', 'add', 'event.php?action=edit&amp;id='.$this->properties->id, $this->properties->name);
2147
2148             $repeatedids = array();
2149
2150             if (!empty($this->properties->repeat)) {
2151                 $this->properties->repeatid = $this->properties->id;
2152                 $DB->set_field('event', 'repeatid', $this->properties->repeatid, array('id'=>$this->properties->id));
2153
2154                 $eventcopy = clone($this->properties);
2155                 unset($eventcopy->id);
2156
2157                 for($i = 1; $i < $eventcopy->repeats; $i++) {
2158
2159                     $eventcopy->timestart = ($eventcopy->timestart+WEEKSECS) + dst_offset_on($eventcopy->timestart) - dst_offset_on($eventcopy->timestart+WEEKSECS);
2160
2161                     // Get the event id for the log record.
2162                     $eventcopyid = $DB->insert_record('event', $eventcopy);
2163
2164                     // If the context has been set delete all associated files
2165                     if ($usingeditor) {
2166                         $fs = get_file_storage();
2167                         $files = $fs->get_area_files($this->editorcontext->id, 'calendar', 'event_description', $this->properties->id);
2168                         foreach ($files as $file) {
2169                             $fs->create_file_from_storedfile(array('itemid'=>$eventcopyid), $file);
2170                         }
2171                     }
2172
2173                     $repeatedids[] = $eventcopyid;
2174                     // Log the event entry.
2175                     add_to_log($eventcopy->courseid, 'calendar', 'add', 'event.php?action=edit&amp;id='.$eventcopyid, $eventcopy->name);
2176                 }
2177             }
2178
2179             // Hook for tracking added events
2180             self::calendar_event_hook('add_event', array($this->properties, $repeatedids));
2181             return true;
2182         } else {
2183
2184             if ($checkcapability) {
2185                 if(!calendar_edit_event_allowed($this->properties)) {
2186                     print_error('nopermissiontoupdatecalendar');
2187                 }
2188             }
2189
2190             if ($usingeditor) {
2191                 if ($this->editorcontext !== null) {
2192                     $this->properties->description = file_save_draft_area_files(
2193                                                     $this->properties->description['itemid'],
2194                                                     $this->editorcontext->id,
2195                                                     'calendar',
2196                                                     'event_description',
2197                                                     $this->properties->id,
2198                                                     $this->editoroptions,
2199                                                     $this->properties->description['text'],
2200                                                     $this->editoroptions['forcehttps']);
2201                 } else {
2202                     $this->properties->format = $this->properties->description['format'];
2203                     $this->properties->description = $this->properties->description['text'];
2204                 }
2205             }
2206
2207             $event = $DB->get_record('event', array('id'=>$this->properties->id));
2208
2209             $updaterepeated = (!empty($this->properties->repeatid) && !empty($this->properties->repeateditall));
2210
2211             if ($updaterepeated) {
2212                 // Update all
2213                 if ($this->properties->timestart != $event->timestart) {
2214                     $timestartoffset = $this->properties->timestart - $event->timestart;
2215                     $sql = "UPDATE {event}
2216                                SET name = ?,
2217                                    description = ?,
2218                                    timestart = timestart + ?,
2219                                    timeduration = ?,
2220                                    timemodified = ?
2221                              WHERE repeatid = ?";
2222                     $params = array($this->properties->name, $this->properties->description, $timestartoffset, $this->properties->timeduration, time(), $event->repeatid);
2223                 } else {
2224                     $sql = "UPDATE {event} SET name = ?, description = ?, timeduration = ?, timemodified = ? WHERE repeatid = ?";
2225                     $params = array($this->properties->name, $this->properties->description, $this->properties->timeduration, time(), $event->repeatid);
2226                 }
2227                 $DB->execute($sql, $params);
2228
2229                 // Log the event update.
2230                 add_to_log($this->properties->courseid, 'calendar', 'edit all', 'event.php?action=edit&amp;id='.$this->properties->id, $this->properties->name);
2231             } else {
2232                 $DB->update_record('event', $this->properties);
2233                 $event = calendar_event::load($this->properties->id);
2234                 $this->properties = $event->properties();
2235                 add_to_log($this->properties->courseid, 'calendar', 'edit', 'event.php?action=edit&amp;id='.$this->properties->id, $this->properties->name);
2236             }
2237
2238             // Hook for tracking event updates
2239             self::calendar_event_hook('update_event', array($this->properties, $updaterepeated));
2240             return true;
2241         }
2242     }
2243
2244     /**
2245      * Deletes an event and if selected an repeated events in the same series
2246      *
2247      * This function deletes an event, any associated events if $deleterepeated=true,
2248      * and cleans up any files associated with the events.
2249      *
2250      * @see delete_event()
2251      *
2252      * @param bool $deleterepeated  delete event repeatedly
2253      * @return bool succession of deleting event
2254      */
2255     public function delete($deleterepeated=false) {
2256         global $DB;
2257
2258         // If $this->properties->id is not set then something is wrong
2259         if (empty($this->properties->id)) {
2260             debugging('Attempting to delete an event before it has been loaded', DEBUG_DEVELOPER);
2261             return false;
2262         }
2263
2264         // Delete the event
2265         $DB->delete_records('event', array('id'=>$this->properties->id));
2266
2267         // If we are deleting parent of a repeated event series, promote the next event in the series as parent
2268         if (($this->properties->id == $this->properties->repeatid) && !$deleterepeated) {
2269             $newparent = $DB->get_field_sql("SELECT id from {event} where repeatid = ? order by id ASC", array($this->properties->id), IGNORE_MULTIPLE);
2270             if (!empty($newparent)) {
2271                 $DB->execute("UPDATE {event} SET repeatid = ? WHERE repeatid = ?", array($newparent, $this->properties->id));
2272                 // Get all records where the repeatid is the same as the event being removed
2273                 $events = $DB->get_records('event', array('repeatid' => $newparent));
2274                 // For each of the returned events trigger the event_update hook.
2275                 foreach ($events as $event) {
2276                     self::calendar_event_hook('update_event', array($event, false));
2277                 }
2278             }
2279         }
2280
2281         // If the editor context hasn't already been set then set it now
2282         if ($this->editorcontext === null) {
2283             $this->editorcontext = $this->properties->context;
2284         }
2285
2286         // If the context has been set delete all associated files
2287         if ($this->editorcontext !== null) {
2288             $fs = get_file_storage();
2289             $files = $fs->get_area_files($this->editorcontext->id, 'calendar', 'event_description', $this->properties->id);
2290             foreach ($files as $file) {
2291                 $file->delete();
2292             }
2293         }
2294
2295         // Fire the event deleted hook
2296         self::calendar_event_hook('delete_event', array($this->properties->id, $deleterepeated));
2297
2298         // If we need to delete repeated events then we will fetch them all and delete one by one
2299         if ($deleterepeated && !empty($this->properties->repeatid) && $this->properties->repeatid > 0) {
2300             // Get all records where the repeatid is the same as the event being removed
2301             $events = $DB->get_records('event', array('repeatid'=>$this->properties->repeatid));
2302             // For each of the returned events populate a calendar_event object and call delete
2303             // make sure the arg passed is false as we are already deleting all repeats
2304             foreach ($events as $event) {
2305                 $event = new calendar_event($event);
2306                 $event->delete(false);
2307             }
2308         }
2309
2310         return true;
2311     }
2312
2313     /**
2314      * Fetch all event properties
2315      *
2316      * This function returns all of the events properties as an object and optionally
2317      * can prepare an editor for the description field at the same time. This is
2318      * designed to work when the properties are going to be used to set the default
2319      * values of a moodle forms form.
2320      *
2321      * @param bool $prepareeditor If set to true a editor is prepared for use with
2322      *              the mforms editor element. (for description)
2323      * @return stdClass Object containing event properties
2324      */
2325     public function properties($prepareeditor=false) {
2326         global $USER, $CFG, $DB;
2327
2328         // First take a copy of the properties. We don't want to actually change the
2329         // properties or we'd forever be converting back and forwards between an
2330         // editor formatted description and not
2331         $properties = clone($this->properties);
2332         // Clean the description here
2333         $properties->description = clean_text($properties->description, $properties->format);
2334
2335         // If set to true we need to prepare the properties for use with an editor
2336         // and prepare the file area
2337         if ($prepareeditor) {
2338
2339             // We may or may not have a property id. If we do then we need to work
2340             // out the context so we can copy the existing files to the draft area
2341             if (!empty($properties->id)) {
2342
2343                 if ($properties->eventtype === 'site') {
2344                     // Site context
2345                     $this->editorcontext = $this->properties->context;
2346                 } else if ($properties->eventtype === 'user') {
2347                     // User context
2348                     $this->editorcontext = $this->properties->context;
2349                 } else if ($properties->eventtype === 'group' || $properties->eventtype === 'course') {
2350                     // First check the course is valid
2351                     $course = $DB->get_record('course', array('id'=>$properties->courseid));
2352                     if (!$course) {
2353                         print_error('invalidcourse');
2354                     }
2355                     // Course context
2356                     $this->editorcontext = $this->properties->context;
2357                     // We have a course and are within the course context so we had
2358                     // better use the courses max bytes value
2359                     $this->editoroptions['maxbytes'] = $course->maxbytes;
2360                 } else {
2361                     // If we get here we have a custom event type as used by some
2362                     // modules. In this case the event will have been added by
2363                     // code and we won't need the editor
2364                     $this->editoroptions['maxbytes'] = 0;
2365                     $this->editoroptions['maxfiles'] = 0;
2366                 }
2367
2368                 if (empty($this->editorcontext) || empty($this->editorcontext->id)) {
2369                     $contextid = false;
2370                 } else {
2371                     // Get the context id that is what we really want
2372                     $contextid = $this->editorcontext->id;
2373                 }
2374             } else {
2375
2376                 // If we get here then this is a new event in which case we don't need a
2377                 // context as there is no existing files to copy to the draft area.
2378                 $contextid = null;
2379             }
2380
2381             // If the contextid === false we don't support files so no preparing
2382             // a draft area
2383             if ($contextid !== false) {
2384                 // Just encase it has already been submitted
2385                 $draftiddescription = file_get_submitted_draft_itemid('description');
2386                 // Prepare the draft area, this copies existing files to the draft area as well
2387                 $properties->description = file_prepare_draft_area($draftiddescription, $contextid, 'calendar', 'event_description', $properties->id, $this->editoroptions, $properties->description);
2388             } else {
2389                 $draftiddescription = 0;
2390             }
2391
2392             // Structure the description field as the editor requires
2393             $properties->description = array('text'=>$properties->description, 'format'=>$properties->format, 'itemid'=>$draftiddescription);
2394         }
2395
2396         // Finally return the properties
2397         return $properties;
2398     }
2399
2400     /**
2401      * Toggles the visibility of an event
2402      *
2403      * @param null|bool $force If it is left null the events visibility is flipped,
2404      *                   If it is false the event is made hidden, if it is true it
2405      *                   is made visible.
2406      * @return bool if event is successfully updated, toggle will be visible
2407      */
2408     public function toggle_visibility($force=null) {
2409         global $CFG, $DB;
2410
2411         // Set visible to the default if it is not already set
2412         if (empty($this->properties->visible)) {
2413             $this->properties->visible = 1;
2414         }
2415
2416         if ($force === true || ($force !== false && $this->properties->visible == 0)) {
2417             // Make this event visible
2418             $this->properties->visible = 1;
2419             // Fire the hook
2420             self::calendar_event_hook('show_event', array($this->properties));
2421         } else {
2422             // Make this event hidden
2423             $this->properties->visible = 0;
2424             // Fire the hook
2425             self::calendar_event_hook('hide_event', array($this->properties));
2426         }
2427
2428         // Update the database to reflect this change
2429         return $DB->set_field('event', 'visible', $this->properties->visible, array('id'=>$this->properties->id));
2430     }
2431
2432     /**
2433      * Attempts to call the hook for the specified action should a calendar type
2434      * by set $CFG->calendar, and the appopriate function defined
2435      *
2436      * @param string $action One of `update_event`, `add_event`, `delete_event`, `show_event`, `hide_event`
2437      * @param array $args The args to pass to the hook, usually the event is the first element
2438      * @return bool attempts to call event hook
2439      */
2440     public static function calendar_event_hook($action, array $args) {
2441         global $CFG;
2442         static $extcalendarinc;
2443         if ($extcalendarinc === null) {
2444             if (!empty($CFG->calendar) && file_exists($CFG->dirroot .'/calendar/'. $CFG->calendar .'/lib.php')) {
2445                 include_once($CFG->dirroot .'/calendar/'. $CFG->calendar .'/lib.php');
2446                 $extcalendarinc = true;
2447             } else {
2448                 $extcalendarinc = false;
2449             }
2450         }
2451         if($extcalendarinc === false) {
2452             return false;
2453         }
2454         $hook = $CFG->calendar .'_'.$action;
2455         if (function_exists($hook)) {
2456             call_user_func_array($hook, $args);
2457             return true;
2458         }
2459         return false;
2460     }
2461
2462     /**
2463      * Returns a calendar_event object when provided with an event id
2464      *
2465      * This function makes use of MUST_EXIST, if the event id passed in is invalid
2466      * it will result in an exception being thrown
2467      *
2468      * @param int|object $param event object or event id
2469      * @return calendar_event|false status for loading calendar_event
2470      */
2471     public static function load($param) {
2472         global $DB;
2473         if (is_object($param)) {
2474             $event = new calendar_event($param);
2475         } else {
2476             $event = $DB->get_record('event', array('id'=>(int)$param), '*', MUST_EXIST);
2477             $event = new calendar_event($event);
2478         }
2479         return $event;
2480     }
2481
2482     /**
2483      * Creates a new event and returns a calendar_event object
2484      *
2485      * @param object|array $properties An object containing event properties
2486      * @return calendar_event|false The event object or false if it failed
2487      */
2488     public static function create($properties) {
2489         if (is_array($properties)) {
2490             $properties = (object)$properties;
2491         }
2492         if (!is_object($properties)) {
2493             throw new coding_exception('When creating an event properties should be either an object or an assoc array');
2494         }
2495         $event = new calendar_event($properties);
2496         if ($event->update($properties)) {
2497             return $event;
2498         } else {
2499             return false;
2500         }
2501     }
2502 }
2503
2504 /**
2505  * Calendar information class
2506  *
2507  * This class is used simply to organise the information pertaining to a calendar
2508  * and is used primarily to make information easily available.
2509  *
2510  * @package core_calendar
2511  * @category calendar
2512  * @copyright 2010 Sam Hemelryk
2513  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
2514  */
2515 class calendar_information {
2516     /** @var int The day */
2517     public $day;
2518
2519     /** @var int The month */
2520     public $month;
2521
2522     /** @var int The year */
2523     public $year;
2524
2525     /** @var int A course id */
2526     public $courseid = null;
2527
2528     /** @var array An array of courses */
2529     public $courses = array();
2530
2531     /** @var array An array of groups */
2532     public $groups = array();
2533
2534     /** @var array An array of users */
2535     public $users = array();
2536
2537     /**
2538      * Creates a new instance
2539      *
2540      * @param int $day the number of the day
2541      * @param int $month the number of the month
2542      * @param int $year the number of the year
2543      */
2544     public function __construct($day=0, $month=0, $year=0) {
2545
2546         $date = usergetdate(time());
2547
2548         if (empty($day)) {
2549             $day = $date['mday'];
2550         }
2551
2552         if (empty($month)) {
2553             $month = $date['mon'];
2554         }
2555
2556         if (empty($year)) {
2557             $year =  $date['year'];
2558         }
2559
2560         $this->day = $day;
2561         $this->month = $month;
2562         $this->year = $year;
2563     }
2564
2565     /**
2566      * Initialize calendar information
2567      *
2568      * @param stdClass $course object
2569      * @param array $coursestoload An array of courses [$course->id => $course]
2570      * @param bool $ignorefilters options to use filter
2571      */
2572     public function prepare_for_view(stdClass $course, array $coursestoload, $ignorefilters = false) {
2573         $this->courseid = $course->id;
2574         $this->course = $course;
2575         list($courses, $group, $user) = calendar_set_filters($coursestoload, $ignorefilters);
2576         $this->courses = $courses;
2577         $this->groups = $group;
2578         $this->users = $user;
2579     }
2580
2581     /**
2582      * Ensures the date for the calendar is correct and either sets it to now
2583      * or throws a moodle_exception if not
2584      *
2585      * @param bool $defaultonow use current time
2586      * @throws moodle_exception
2587      * @return bool validation of checkdate
2588      */
2589     public function checkdate($defaultonow = true) {
2590         if (!checkdate($this->month, $this->day, $this->year)) {
2591             if ($defaultonow) {
2592                 $now = usergetdate(time());
2593                 $this->day = intval($now['mday']);
2594                 $this->month = intval($now['mon']);
2595                 $this->year = intval($now['year']);
2596                 return true;
2597             } else {
2598                 throw new moodle_exception('invaliddate');
2599             }
2600         }
2601         return true;
2602     }
2603     /**
2604      * Gets todays timestamp for the calendar
2605      *
2606      * @return int today timestamp
2607      */
2608     public function timestamp_today() {
2609         return make_timestamp($this->year, $this->month, $this->day);
2610     }
2611     /**
2612      * Gets tomorrows timestamp for the calendar
2613      *
2614      * @return int tomorrow timestamp
2615      */
2616     public function timestamp_tomorrow() {
2617         return make_timestamp($this->year, $this->month, $this->day+1);
2618     }
2619     /**
2620      * Adds the pretend blocks for teh calendar
2621      *
2622      * @param core_calendar_renderer $renderer
2623      * @param bool $showfilters display filters, false is set as default
2624      * @param string|null $view preference view options (eg: day, month, upcoming)
2625      */
2626     public function add_sidecalendar_blocks(core_calendar_renderer $renderer, $showfilters=false, $view=null) {
2627         if ($showfilters) {
2628             $filters = new block_contents();
2629             $filters->content = $renderer->fake_block_filters($this->courseid, $this->day, $this->month, $this->year, $view, $this->courses);
2630             $filters->footer = '';
2631             $filters->title = get_string('eventskey', 'calendar');
2632             $renderer->add_pretend_calendar_block($filters, BLOCK_POS_RIGHT);
2633         }
2634         $block = new block_contents;
2635         $block->content = $renderer->fake_block_threemonths($this);
2636         $block->footer = '';
2637         $block->title = get_string('monthlyview', 'calendar');
2638         $renderer->add_pretend_calendar_block($block, BLOCK_POS_RIGHT);
2639     }
2640 }