calendar/lib.php

   1 <?php // $Id$
   2
   3 /////////////////////////////////////////////////////////////////////////////
   4 //                                                                         //
   5 // NOTICE OF COPYRIGHT                                                     //
   6 //                                                                         //
   7 // Moodle - Calendar extension                                             //
   8 //                                                                         //
   9 // Copyright (C) 2003-2004  Greek School Network            www.sch.gr     //
  10 //                                                                         //
  11 // Designed by:                                                            //
  12 //     Avgoustos Tsinakos (tsinakos@teikav.edu.gr)                         //
  13 //     Jon Papaioannou (pj@moodle.org)                                     //
  14 //                                                                         //
  15 // Programming and development:                                            //
  16 //     Jon Papaioannou (pj@moodle.org)                                     //
  17 //                                                                         //
  18 // For bugs, suggestions, etc contact:                                     //
  19 //     Jon Papaioannou (pj@moodle.org)                                     //
  20 //                                                                         //
  21 // The current module was developed at the University of Macedonia         //
  22 // (www.uom.gr) under the funding of the Greek School Network (www.sch.gr) //
  23 // The aim of this project is to provide additional and improved           //
  24 // functionality to the Asynchronous Distance Education service that the   //
  25 // Greek School Network deploys.                                           //
  26 //                                                                         //
  27 // This program is free software; you can redistribute it and/or modify    //
  28 // it under the terms of the GNU General Public License as published by    //
  29 // the Free Software Foundation; either version 2 of the License, or       //
  30 // (at your option) any later version.                                     //
  31 //                                                                         //
  32 // This program is distributed in the hope that it will be useful,         //
  33 // but WITHOUT ANY WARRANTY; without even the implied warranty of          //
  34 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           //
  35 // GNU General Public License for more details:                            //
  36 //                                                                         //
  37 //          http://www.gnu.org/copyleft/gpl.html                           //
  38 //                                                                         //
  39 /////////////////////////////////////////////////////////////////////////////
  40
  41 // These are read by the administration component to provide default values
  42 define('CALENDAR_DEFAULT_UPCOMING_LOOKAHEAD', 21);
  43 define('CALENDAR_DEFAULT_UPCOMING_MAXEVENTS', 10);
  44 define('CALENDAR_DEFAULT_STARTING_WEEKDAY',   1);
  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 define('CALENDAR_DEFAULT_WEEKEND',            65);
  48
  49 // Fetch the correct values from admin settings/lang pack
  50 // If no such settings found, use the above defaults
  51 $firstday = isset($CFG->calendar_startwday) ? $CFG->calendar_startwday : get_string('firstdayofweek');
  52 if(!is_numeric($firstday)) {
  53     define ('CALENDAR_STARTING_WEEKDAY', CALENDAR_DEFAULT_STARTING_WEEKDAY);
  54 }
  55 else {
  56     define ('CALENDAR_STARTING_WEEKDAY', intval($firstday) % 7);
  57 }
  58 define ('CALENDAR_UPCOMING_DAYS', isset($CFG->calendar_lookahead) ? intval($CFG->calendar_lookahead) : CALENDAR_DEFAULT_UPCOMING_LOOKAHEAD);
  59 define ('CALENDAR_UPCOMING_MAXEVENTS', isset($CFG->calendar_maxevents) ? intval($CFG->calendar_maxevents) : CALENDAR_DEFAULT_UPCOMING_MAXEVENTS);
  60 define ('CALENDAR_WEEKEND', isset($CFG->calendar_weekend) ? intval($CFG->calendar_weekend) : CALENDAR_DEFAULT_WEEKEND);
  61 define ('CALENDAR_URL', $CFG->wwwroot.'/calendar/');
  62 define ('CALENDAR_TF_24', '%H:%M');
  63 define ('CALENDAR_TF_12', '%I:%M %p');
  64
  65 $CALENDARDAYS = array('sunday','monday','tuesday','wednesday','thursday','friday','saturday');
  66
  67
  68
  69 function calendar_get_mini($courses, $groups, $users, $cal_month = false, $cal_year = false) {
  70     global $CFG, $USER;
  71
  72     $display = new stdClass;
  73     $display->minwday = get_user_preferences('calendar_startwday', CALENDAR_STARTING_WEEKDAY);
  74     $display->maxwday = $display->minwday + 6;
  75
  76     $content = '';
  77
  78     if(!empty($cal_month) && !empty($cal_year)) {
  79         $thisdate = usergetdate(time()); // Date and time the user sees at his location
  80         if($cal_month == $thisdate['mon'] && $cal_year == $thisdate['year']) {
  81             // Navigated to this month
  82             $date = $thisdate;
  83             $display->thismonth = true;
  84         }
  85         else {
  86             // Navigated to other month, let's do a nice trick and save us a lot of work...
  87             if(!checkdate($cal_month, 1, $cal_year)) {
  88                 $date = array('mday' => 1, 'mon' => $thisdate['mon'], 'year' => $thisdate['year']);
  89                 $display->thismonth = true;
  90             }
  91             else {
  92                 $date = array('mday' => 1, 'mon' => $cal_month, 'year' => $cal_year);
  93                 $display->thismonth = false;
  94             }
  95         }
  96     }
  97     else {
  98         $date = usergetdate(time()); // Date and time the user sees at his location
  99         $display->thismonth = true;
 100     }
 101
 102     // Fill in the variables we 're going to use, nice and tidy
 103     list($d, $m, $y) = array($date['mday'], $date['mon'], $date['year']); // This is what we want to display
 104     $display->maxdays = calendar_days_in_month($m, $y);
 105
 106     if (get_user_timezone_offset() < 99) {
 107         // We 'll keep these values as GMT here, and offset them when the time comes to query the db
 108         $display->tstart = gmmktime(0, 0, 0, $m, 1, $y); // This is GMT
 109         $display->tend = gmmktime(23, 59, 59, $m, $display->maxdays, $y); // GMT
 110     } else {
 111         // no timezone info specified
 112         $display->tstart = mktime(0, 0, 0, $m, 1, $y);
 113         $display->tend = mktime(23, 59, 59, $m, $display->maxdays, $y);
 114     }
 115
 116     $startwday = dayofweek(1, $m, $y);
 117
 118     // Align the starting weekday to fall in our display range
 119     // This is simple, not foolproof.
 120     if($startwday < $display->minwday) {
 121         $startwday += 7;
 122     }
 123
 124     // TODO: THIS IS TEMPORARY CODE!
 125     // [pj] I was just reading through this and realized that I when writing this code I was probably
 126     // asking for trouble, as all these time manipulations seem to be unnecessary and a simple
 127     // make_timestamp would accomplish the same thing. So here goes a test:
 128     //$test_start = make_timestamp($y, $m, 1);
 129     //$test_end   = make_timestamp($y, $m, $display->maxdays, 23, 59, 59);
 130     //if($test_start != usertime($display->tstart) - dst_offset_on($display->tstart)) {
 131         //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);
 132     //}
 133     //if($test_end != usertime($display->tend) - dst_offset_on($display->tend)) {
 134         //notify('Failed assertion in calendar/lib.php line 130; display->tend = '.$display->tend.', dst_offset = '.dst_offset_on($display->tend).', usertime = '.usertime($display->tend).', make_t = '.$test_end);
 135     //}
 136
 137
 138     // Get the events matching our criteria. Don't forget to offset the timestamps for the user's TZ!
 139     $events = calendar_get_events(
 140         usertime($display->tstart) - dst_offset_on($display->tstart),
 141         usertime($display->tend) - dst_offset_on($display->tend),
 142         $users, $groups, $courses);
 143
 144     // Set event course class for course events
 145     if (!empty($events)) {
 146         foreach ($events as $eventid => $event) {
 147             if (!empty($event->modulename)) {
 148                 $cm = get_coursemodule_from_instance($event->modulename, $event->instance);
 149                 if (!groups_course_module_visible($cm)) {
 150                     unset($events[$eventid]);
 151                 }
 152             }
 153         }
 154     }
 155
 156     // This is either a genius idea or an idiot idea: in order to not complicate things, we use this rule: if, after
 157     // possibly removing SITEID from $courses, there is only one course left, then clicking on a day in the month
 158     // will also set the $SESSION->cal_courses_shown variable to that one course. Otherwise, we 'd need to add extra
 159     // arguments to this function.
 160
 161     $morehref = '';
 162     if(!empty($courses)) {
 163         $courses = array_diff($courses, array(SITEID));
 164         if(count($courses) == 1) {
 165             $morehref = '&amp;course='.reset($courses);
 166         }
 167     }
 168
 169     // We want to have easy access by day, since the display is on a per-day basis.
 170     // Arguments passed by reference.
 171     //calendar_events_by_day($events, $display->tstart, $eventsbyday, $durationbyday, $typesbyday);
 172     calendar_events_by_day($events, $m, $y, $eventsbyday, $durationbyday, $typesbyday, $courses);
 173
 174     //Accessibility: added summary and <abbr> elements.
 175     ///global $CALENDARDAYS; appears to be broken.
 176     $days_title = array('sunday','monday','tuesday','wednesday','thursday','friday','saturday');
 177
 178     $summary = get_string('calendarheading', 'calendar', userdate(make_timestamp($y, $m), get_string('strftimemonthyear')));
 179     $summary = get_string('tabledata', 'access', $summary);
 180     $content .= '<table class="minicalendar" summary="'.$summary.'">'; // Begin table
 181     $content .= '<tr class="weekdays">'; // Header row: day names
 182
 183     // Print out the names of the weekdays
 184     $days = array('sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat');
 185     for($i = $display->minwday; $i <= $display->maxwday; ++$i) {
 186         // This uses the % operator to get the correct weekday no matter what shift we have
 187         // applied to the $display->minwday : $display->maxwday range from the default 0 : 6
 188         $content .= '<th scope="col"><abbr title="'. get_string($days_title[$i % 7], 'calendar') .'">'.
 189             get_string($days[$i % 7], 'calendar') ."</abbr></th>\n";
 190     }
 191
 192     $content .= '</tr><tr>'; // End of day names; prepare for day numbers
 193
 194     // For the table display. $week is the row; $dayweek is the column.
 195     $dayweek = $startwday;
 196
 197     // Paddding (the first week may have blank days in the beginning)
 198     for($i = $display->minwday; $i < $startwday; ++$i) {
 199         $content .= '<td class="dayblank">&nbsp;</td>'."\n";
 200     }
 201
 202     // Now display all the calendar
 203     for($day = 1; $day <= $display->maxdays; ++$day, ++$dayweek) {
 204         if($dayweek > $display->maxwday) {
 205             // We need to change week (table row)
 206             $content .= '</tr><tr>';
 207             $dayweek = $display->minwday;
 208         }
 209
 210         // Reset vars
 211         $cell = '';
 212         if(CALENDAR_WEEKEND & (1 << ($dayweek % 7))) {
 213             // Weekend. This is true no matter what the exact range is.
 214             $class = 'weekend day';
 215         }
 216         else {
 217             // Normal working day.
 218             $class = 'day';
 219         }
 220
 221         // Special visual fx if an event is defined
 222         if(isset($eventsbyday[$day])) {
 223             $dayhref = calendar_get_link_href(CALENDAR_URL.'view.php?view=day'.$morehref.'&amp;', $day, $m, $y);
 224
 225             // OverLib popup
 226             $popupcontent = '';
 227             foreach($eventsbyday[$day] as $eventid) {
 228                 if (!isset($events[$eventid])) {
 229                     continue;
 230                 }
 231                 $event = $events[$eventid];
 232                 if(!empty($event->modulename)) {
 233                     $popupicon = $CFG->modpixpath.'/'.$event->modulename.'/icon.gif';
 234                     $popupalt  = $event->modulename;
 235
 236                 } else if ($event->courseid == SITEID) {                                // Site event
 237                     $popupicon = $CFG->pixpath.'/c/site.gif';
 238                     $popupalt  = '';
 239                 } else if ($event->courseid != 0 && $event->courseid != SITEID && $event->groupid == 0) {      // Course event
 240                     $popupicon = $CFG->pixpath.'/c/course.gif';
 241                     $popupalt  = '';
 242                 } else if ($event->groupid) {                                      // Group event
 243                     $popupicon = $CFG->pixpath.'/c/group.gif';
 244                     $popupalt  = '';
 245                 } else if ($event->userid) {                                       // User event
 246                     $popupicon = $CFG->pixpath.'/c/user.gif';
 247                     $popupalt  = '';
 248                 }
 249                 $popupcontent .= '<div><img class="icon" src="'.$popupicon.'" alt="'.$popupalt.'" /><a href="'.$dayhref.'#event_'.$event->id.'">'.format_string($event->name, true).'</a></div>';
 250             }
 251
 252             //Accessibility: functionality moved to calendar_get_popup.
 253             if($display->thismonth && $day == $d) {
 254                 $popup = calendar_get_popup(true, $events[$eventid]->timestart, $popupcontent);
 255             } else {
 256                 $popup = calendar_get_popup(false, $events[$eventid]->timestart, $popupcontent);
 257             }
 258
 259             // Class and cell content
 260             if(isset($typesbyday[$day]['startglobal'])) {
 261                 $class .= ' event_global';
 262             }
 263             else if(isset($typesbyday[$day]['startcourse'])) {
 264                 $class .= ' event_course';
 265             }
 266             else if(isset($typesbyday[$day]['startgroup'])) {
 267                 $class .= ' event_group';
 268             }
 269             else if(isset($typesbyday[$day]['startuser'])) {
 270                 $class .= ' event_user';
 271             }
 272             $cell = '<a href="'.$dayhref.'" '.$popup.'>'.$day.'</a>';
 273         }
 274         else {
 275             $cell = $day;
 276         }
 277
 278         if(isset($typesbyday[$day]['durationglobal'])) {
 279             $class .= ' duration_global';
 280         }
 281         else if(isset($typesbyday[$day]['durationcourse'])) {
 282             $class .= ' duration_course';
 283         }
 284         else if(isset($typesbyday[$day]['durationgroup'])) {
 285             $class .= ' duration_group';
 286         }
 287         else if(isset($typesbyday[$day]['durationuser'])) {
 288             $class .= ' duration_user';
 289         }
 290
 291         // If event has a class set then add it to the table day <td> tag
 292         // Note: only one colour for minicalendar
 293         if(isset($eventsbyday[$day])) {
 294             foreach($eventsbyday[$day] as $eventid) {
 295                 if (!isset($events[$eventid])) {
 296                     continue;
 297                 }
 298                 $event = $events[$eventid];
 299                 if (!empty($event->class)) {
 300                     $class .= ' '.$event->class;
 301                 }
 302                 break;
 303             }
 304         }
 305
 306         // Special visual fx for today
 307         //Accessibility: hidden text for today, and popup.
 308         if($display->thismonth && $day == $d) {
 309             $class .= ' today';
 310             $today = get_string('today', 'calendar').' '.userdate(time(), get_string('strftimedayshort'));
 311
 312             if(! isset($eventsbyday[$day])) {
 313                 $class .= ' eventnone';
 314                 $popup = calendar_get_popup(true, false);
 315                 $cell = '<a href="#" '.$popup.'>'.$day.'</a>';
 316             }
 317             $cell = get_accesshide($today.' ').$cell;
 318         }
 319
 320         // Just display it
 321         if(!empty($class)) {
 322             $class = ' class="'.$class.'"';
 323         }
 324         $content .= '<td'.$class.'>'.$cell."</td>\n";
 325     }
 326
 327     // Paddding (the last week may have blank days at the end)
 328     for($i = $dayweek; $i <= $display->maxwday; ++$i) {
 329         $content .= '<td class="dayblank">&nbsp;</td>';
 330     }
 331     $content .= '</tr>'; // Last row ends
 332
 333     $content .= '</table>'; // Tabular display of days ends
 334
 335     return $content;
 336 }
 337
 338 /**
 339  * calendar_get_popup, called at multiple points in from calendar_get_mini.
 340  *        Copied and modified from calendar_get_mini.
 341  * @uses OverLib popup.
 342  * @param $is_today bool, false except when called on the current day.
 343  * @param $event_timestart mixed, $events[$eventid]->timestart, OR false if there are no events.
 344  * @param $popupcontent string.
 345  * @return $popup string, contains onmousover and onmouseout events.
 346  */
 347 function calendar_get_popup($is_today, $event_timestart, $popupcontent='') {
 348     $popupcaption = '';
 349     if($is_today) {
 350         $popupcaption = get_string('today', 'calendar').' ';
 351     }
 352     if (false === $event_timestart) {
 353         $popupcaption .= userdate(time(), get_string('strftimedayshort'));
 354         $popupcontent = get_string('eventnone', 'calendar');
 355
 356     } else {
 357         $popupcaption .= get_string('eventsfor', 'calendar', userdate($event_timestart, get_string('strftimedayshort')));
 358     }
 359     $popupcontent = str_replace("'", "\'", htmlspecialchars($popupcontent));
 360     $popupcaption = str_replace("'", "\'", htmlspecialchars($popupcaption));
 361     $popup = 'onmouseover="return overlib(\''.$popupcontent.'\', CAPTION, \''.$popupcaption.'\');" onmouseout="return nd();"';
 362     return $popup;
 363 }
 364
 365 function calendar_get_upcoming($courses, $groups, $users, $daysinfuture, $maxevents, $fromtime=0) {
 366     global $CFG, $COURSE;
 367
 368     $display = new stdClass;
 369     $display->range = $daysinfuture; // How many days in the future we 'll look
 370     $display->maxevents = $maxevents;
 371
 372     $output = array();
 373
 374     // Prepare "course caching", since it may save us a lot of queries
 375     $coursecache = array();
 376
 377     $processed = 0;
 378     $now = time(); // We 'll need this later
 379     $usermidnighttoday = usergetmidnight($now);
 380
 381     if ($fromtime) {
 382         $display->tstart = $fromtime;
 383     } else {
 384         $display->tstart = $usermidnighttoday;
 385     }
 386
 387     // This works correctly with respect to the user's DST, but it is accurate
 388     // only because $fromtime is always the exact midnight of some day!
 389     $display->tend = usergetmidnight($display->tstart + DAYSECS * $display->range + 3 * HOURSECS) - 1;
 390
 391     // Get the events matching our criteria
 392     $events = calendar_get_events($display->tstart, $display->tend, $users, $groups, $courses);
 393
 394     // This is either a genius idea or an idiot idea: in order to not complicate things, we use this rule: if, after
 395     // possibly removing SITEID from $courses, there is only one course left, then clicking on a day in the month
 396     // will also set the $SESSION->cal_courses_shown variable to that one course. Otherwise, we 'd need to add extra
 397     // arguments to this function.
 398
 399     $morehref = '';
 400     if(!empty($courses)) {
 401         $courses = array_diff($courses, array(SITEID));
 402         if(count($courses) == 1) {
 403             $morehref = '&amp;course='.reset($courses);
 404         }
 405     }
 406
 407     if ($events !== false) {
 408
 409         $modinfo =& get_fast_modinfo($COURSE);
 410
 411         foreach($events as $event) {
 412
 413
 414             if (!empty($event->modulename)) {
 415                 if ($event->courseid == $COURSE->id) {
 416                     if (isset($modinfo->instances[$event->modulename][$event->instance])) {
 417                         $cm = $modinfo->instances[$event->modulename][$event->instance];
 418                         if (!$cm->uservisible) {
 419                             continue;
 420                         }
 421                     }
 422                 } else {
 423                     if (!$cm = get_coursemodule_from_instance($event->modulename, $event->instance)) {
 424                         continue;
 425                     }
 426                     if (!coursemodule_visible_for_user($cm)) {
 427                         continue;
 428                     }
 429                 }
 430                 if ($event->modulename == 'assignment'){
 431                     // TODO: rewrite this hack somehow
 432                     if (!calendar_edit_event_allowed($event)){ // cannot manage entries, eg. student
 433                         if(!$assignment = get_record('assignment','id',$event->instance)){
 434                             // error("assignment ID was incorrect");
 435                             continue;
 436                         }
 437                         // assign assignment to assignment object to use hidden_is_hidden method
 438                         require_once($CFG->dirroot.'/mod/assignment/lib.php');
 439
 440                         if (!file_exists($CFG->dirroot.'/mod/assignment/type/'.$assignment->assignmenttype.'/assignment.class.php')) {
 441                             continue;
 442                         }
 443                         require_once ($CFG->dirroot.'/mod/assignment/type/'.$assignment->assignmenttype.'/assignment.class.php');
 444
 445                         $assignmentclass = 'assignment_'.$assignment->assignmenttype;
 446                         $assignmentinstance = new $assignmentclass($cm->id, $assignment, $cm);
 447
 448                         if ($assignmentinstance->description_is_hidden()){//force not to show description before availability
 449                             $event->description = get_string('notavailableyet', 'assignment');
 450                         }
 451                     }
 452                 }
 453             }
 454
 455             if ($processed >= $display->maxevents) {
 456                 break;
 457             }
 458
 459             $event->time = calendar_format_event_time($event, $now, $morehref);
 460             $output[] = $event;
 461             ++$processed;
 462         }
 463     }
 464     return $output;
 465 }
 466
 467 function calendar_add_event_metadata($event) {
 468     global $CFG;
 469
 470     //Support multilang in event->name
 471     $event->name = format_string($event->name,true);
 472
 473     if(!empty($event->modulename)) {                                // Activity event
 474         // The module name is set. I will assume that it has to be displayed, and
 475         // also that it is an automatically-generated event. And of course that the
 476         // fields for get_coursemodule_from_instance are set correctly.
 477         $module = calendar_get_module_cached($coursecache, $event->modulename, $event->instance);
 478
 479         if ($module === false) {
 480             return;
 481         }
 482
 483         $modulename = get_string('modulename', $event->modulename);
 484         $eventtype = get_string($event->eventtype, $event->modulename);
 485         $icon = $CFG->modpixpath.'/'.$event->modulename.'/icon.gif';
 486
 487         $event->icon = '<img height="16" width="16" src="'.$icon.'" alt="'.$eventtype.'" title="'.$modulename.'" style="vertical-align: middle;" />';
 488         $event->referer = '<a href="'.$CFG->wwwroot.'/mod/'.$event->modulename.'/view.php?id='.$module->id.'">'.$event->name.'</a>';
 489         $event->courselink = '<a href="'.$CFG->wwwroot.'/course/view.php?id='.$module->course.'">'.$coursecache[$module->course]->fullname.'</a>';
 490         $event->cmid = $module->id;
 491
 492
 493     } else if($event->courseid == SITEID) {                              // Site event
 494         $event->icon = '<img height="16" width="16" src="'.$CFG->pixpath.'/c/site.gif" alt="'.get_string('globalevent', 'calendar').'" style="vertical-align: middle;" />';
 495         $event->cssclass = 'event_global';
 496     } else if($event->courseid != 0 && $event->courseid != SITEID && $event->groupid == 0) {          // Course event
 497         calendar_get_course_cached($coursecache, $event->courseid);
 498         $event->icon = '<img height="16" width="16" src="'.$CFG->pixpath.'/c/course.gif" alt="'.get_string('courseevent', 'calendar').'" style="vertical-align: middle;" />';
 499         $event->courselink = '<a href="'.$CFG->wwwroot.'/course/view.php?id='.$event->courseid.'">'.$coursecache[$event->courseid]->fullname.'</a>';
 500         $event->cssclass = 'event_course';
 501     } else if ($event->groupid) {                                    // Group event
 502         $event->icon = '<img height="16" width="16" src="'.$CFG->pixpath.'/c/group.gif" alt="'.get_string('groupevent', 'calendar').'" style="vertical-align: middle;" />';
 503         $event->cssclass = 'event_group';
 504     } else if($event->userid) {                                      // User event
 505         $event->icon = '<img height="16" width="16" src="'.$CFG->pixpath.'/c/user.gif" alt="'.get_string('userevent', 'calendar').'" style="vertical-align: middle;" />';
 506         $event->cssclass = 'event_user';
 507     }
 508     return $event;
 509 }
 510
 511 function calendar_print_event($event) {
 512     global $CFG, $USER;
 513
 514     static $strftimetime;
 515
 516     $event = calendar_add_event_metadata($event);
 517     echo '<a name="event_'.$event->id.'"></a><table class="event" cellspacing="0">';
 518     echo '<tr><td class="picture">';
 519     if (!empty($event->icon)) {
 520         echo $event->icon;
 521     } else {
 522         print_spacer(16,16);
 523     }
 524     echo '</td>';
 525     echo '<td class="topic">';
 526
 527     if (!empty($event->referer)) {
 528         echo '<div class="referer">'.$event->referer.'</div>';
 529     } else {
 530         echo '<div class="name">'.$event->name."</div>";
 531     }
 532     if (!empty($event->courselink)) {
 533         echo '<div class="course">'.$event->courselink.' </div>';
 534     }
 535     if (!empty($event->time)) {
 536         echo '<span class="date">'.$event->time.'</span>';
 537     } else {
 538         echo '<span class="date">'.calendar_time_representation($event->timestart).'</span>';
 539     }
 540
 541     echo '</td></tr>';
 542     echo '<tr><td class="side">&nbsp;</td>';
 543     if (isset($event->cssclass)) {
 544         echo '<td class="description '.$event->cssclass.'">';
 545     } else {
 546         echo '<td class="description">';
 547     }
 548     echo format_text($event->description, FORMAT_HTML);
 549     if (calendar_edit_event_allowed($event)) {
 550         echo '<div class="commands">';
 551         $calendarcourseid = '';
 552         if (!empty($event->calendarcourseid)) {
 553             $calendarcourseid = '&amp;course='.$event->calendarcourseid;
 554         }
 555         if (empty($event->cmid)) {
 556             $editlink   = CALENDAR_URL.'event.php?action=edit&amp;id='.$event->id.$calendarcourseid;
 557             $deletelink = CALENDAR_URL.'event.php?action=delete&amp;id='.$event->id.$calendarcourseid;
 558         } else {
 559             $editlink   = $CFG->wwwroot.'/course/mod.php?update='.$event->cmid.'&amp;return=true&amp;sesskey='.$USER->sesskey;
 560             $deletelink = ''; // deleting activities directly from calendar is dangerous/confusing - see MDL-11843
 561         }
 562         echo ' <a href="'.$editlink.'"><img
 563                   src="'.$CFG->pixpath.'/t/edit.gif" alt="'.get_string('tt_editevent', 'calendar').'"
 564                   title="'.get_string('tt_editevent', 'calendar').'" /></a>';
 565         if ($deletelink) {
 566             echo ' <a href="'.$deletelink.'"><img
 567                       src="'.$CFG->pixpath.'/t/delete.gif" alt="'.get_string('tt_deleteevent', 'calendar').'"
 568                       title="'.get_string('tt_deleteevent', 'calendar').'" /></a>';
 569         }
 570         echo '</div>';
 571     }
 572     echo '</td></tr></table>';
 573
 574 }
 575
 576 /**
 577  * Get calendar events
 578  * @param int $tstart Start time of time range for events
 579  * @param int $tend   End time of time range for events
 580  * @param array/int/boolean $users array of users, user id or boolean for all/no user events
 581  * @param array/int/boolean $groups array of groups, group id or boolean for all/no group events
 582  * @param array/int/boolean $courses array of courses, course id or boolean for all/no course events
 583  * @param boolean $withduration whether only events starting within time range selected
 584  *                              or events in progress/already started selected as well
 585  * @param boolean $ignorehidden whether to select only visible events or all events
 586  * @return array of selected events or an empty array if there aren't any (or there was an error)
 587  */
 588 function calendar_get_events($tstart, $tend, $users, $groups, $courses, $withduration=true, $ignorehidden=true) {
 589     $whereclause = '';
 590     // Quick test
 591     if(is_bool($users) && is_bool($groups) && is_bool($courses)) {
 592         return array();
 593     }
 594
 595     if(is_array($users) && !empty($users)) {
 596         // Events from a number of users
 597         if(!empty($whereclause)) $whereclause .= ' OR';
 598         $whereclause .= ' (userid IN ('.implode(',', $users).') AND courseid = 0 AND groupid = 0)';
 599     }
 600     else if(is_numeric($users)) {
 601         // Events from one user
 602         if(!empty($whereclause)) $whereclause .= ' OR';
 603         $whereclause .= ' (userid = '.$users.' AND courseid = 0 AND groupid = 0)';
 604     }
 605     else if($users === true) {
 606         // Events from ALL users
 607         if(!empty($whereclause)) $whereclause .= ' OR';
 608         $whereclause .= ' (userid != 0 AND courseid = 0 AND groupid = 0)';
 609     }
 610     else if($users === false) {
 611         // No user at all, do nothing
 612     }
 613
 614     if(is_array($groups) && !empty($groups)) {
 615         // Events from a number of groups
 616         if(!empty($whereclause)) $whereclause .= ' OR';
 617         $whereclause .= ' groupid IN ('.implode(',', $groups).')';
 618     }
 619     else if(is_numeric($groups)) {
 620         // Events from one group
 621         if(!empty($whereclause)) $whereclause .= ' OR ';
 622         $whereclause .= ' groupid = '.$groups;
 623     }
 624     else if($groups === true) {
 625         // Events from ALL groups
 626         if(!empty($whereclause)) $whereclause .= ' OR ';
 627         $whereclause .= ' groupid != 0';
 628     }
 629     // boolean false (no groups at all): we don't need to do anything
 630
 631     if(is_array($courses)) {
 632         // A number of courses (maybe none at all!)
 633         if(!empty($courses)) {
 634             if(!empty($whereclause)) {
 635                 $whereclause .= ' OR';
 636             }
 637             $whereclause .= ' (groupid = 0 AND courseid IN ('.implode(',', $courses).'))';
 638         }
 639         else {
 640             // This means NO courses, not that we don't care!
 641             // No need to do anything
 642         }
 643     }
 644     else if(is_numeric($courses)) {
 645         // One course
 646         if(!empty($whereclause)) $whereclause .= ' OR';
 647         $whereclause .= ' (groupid = 0 AND courseid = '.$courses.')';
 648     }
 649     else if($courses === true) {
 650         // Events from ALL courses
 651         if(!empty($whereclause)) $whereclause .= ' OR';
 652         $whereclause .= ' (groupid = 0 AND courseid != 0)';
 653     }
 654
 655     // Security check: if, by now, we have NOTHING in $whereclause, then it means
 656     // that NO event-selecting clauses were defined. Thus, we won't be returning ANY
 657     // events no matter what. Allowing the code to proceed might return a completely
 658     // valid query with only time constraints, thus selecting ALL events in that time frame!
 659     if(empty($whereclause)) {
 660         return array();
 661     }
 662
 663     if($withduration) {
 664         $timeclause = '(timestart >= '.$tstart.' OR timestart + timeduration > '.$tstart.') AND timestart <= '.$tend;
 665     }
 666     else {
 667         $timeclause = 'timestart >= '.$tstart.' AND timestart <= '.$tend;
 668     }
 669     if(!empty($whereclause)) {
 670         // We have additional constraints
 671         $whereclause = $timeclause.' AND ('.$whereclause.')';
 672     }
 673     else {
 674         // Just basic time filtering
 675         $whereclause = $timeclause;
 676     }
 677
 678     if ($ignorehidden) {
 679         $whereclause .= ' AND visible = 1';
 680     }
 681
 682     $events = get_records_select('event', $whereclause, 'timestart');
 683     if ($events === false) {
 684         $events = array();
 685     }
 686     return $events;
 687 }
 688
 689 function calendar_top_controls($type, $data) {
 690     global $CFG, $CALENDARDAYS, $THEME;
 691     $content = '';
 692     if(!isset($data['d'])) {
 693         $data['d'] = 1;
 694     }
 695
 696     // Ensure course id passed if relevant
 697     // Required due to changes in view/lib.php mainly (calendar_session_vars())
 698     $courseid = '';
 699     if (!empty($data['id'])) {
 700         $courseid = '&amp;course='.$data['id'];
 701     }
 702
 703     if(!checkdate($data['m'], $data['d'], $data['y'])) {
 704         $time = time();
 705     }
 706     else {
 707         $time = make_timestamp($data['y'], $data['m'], $data['d']);
 708     }
 709     $date = usergetdate($time);
 710
 711     $data['m'] = $date['mon'];
 712     $data['y'] = $date['year'];
 713
 714     //Accessibility: calendar block controls, replaced <table> with <div>.
 715     //$nexttext = link_arrow_right(get_string('monthnext', 'access'), $url='', $accesshide=true);
 716     //$prevtext = link_arrow_left(get_string('monthprev', 'access'), $url='', $accesshide=true);
 717
 718     switch($type) {
 719         case 'frontpage':
 720             list($prevmonth, $prevyear) = calendar_sub_month($data['m'], $data['y']);
 721             list($nextmonth, $nextyear) = calendar_add_month($data['m'], $data['y']);
 722             $nextlink = calendar_get_link_next(get_string('monthnext', 'access'), 'index.php?', 0, $nextmonth, $nextyear, $accesshide=true);
 723             $prevlink = calendar_get_link_previous(get_string('monthprev', 'access'), 'index.php?', 0, $prevmonth, $prevyear, true);
 724             $content .= "\n".'<div class="calendar-controls">'. $prevlink;
 725             $content .= '<span class="hide"> | </span><span class="current"><a href="'.calendar_get_link_href(CALENDAR_URL.'view.php?view=month'.$courseid.'&amp;', 1, $data['m'], $data['y']).'">'.userdate($time, get_string('strftimemonthyear')).'</a></span>';
 726             $content .= '<span class="hide"> | </span>'. $nextlink ."\n";
 727             $content .= "<span class=\"clearer\"><!-- --></span></div>\n";
 728         break;
 729         case 'course':
 730             list($prevmonth, $prevyear) = calendar_sub_month($data['m'], $data['y']);
 731             list($nextmonth, $nextyear) = calendar_add_month($data['m'], $data['y']);
 732             $nextlink = calendar_get_link_next(get_string('monthnext', 'access'), 'view.php?id='.$data['id'].'&amp;', 0, $nextmonth, $nextyear, $accesshide=true);
 733             $prevlink = calendar_get_link_previous(get_string('monthprev', 'access'), 'view.php?id='.$data['id'].'&amp;', 0, $prevmonth, $prevyear, true);
 734             $content .= "\n".'<div class="calendar-controls">'. $prevlink;
 735             $content .= '<span class="hide"> | </span><span class="current"><a href="'.calendar_get_link_href(CALENDAR_URL.'view.php?view=month'.$courseid.'&amp;', 1, $data['m'], $data['y']).'">'.userdate($time, get_string('strftimemonthyear')).'</a></span>';
 736             $content .= '<span class="hide"> | </span>'. $nextlink ."\n";
 737             $content .= "<span class=\"clearer\"><!-- --></span></div>\n";
 738         break;
 739         case 'upcoming':
 740             $content .= '<div style="text-align: center;"><a href="'.CALENDAR_URL.'view.php?view=upcoming"'.$courseid.'>'.userdate($time, get_string('strftimemonthyear'))."</a></div>\n";
 741         break;
 742         case 'display':
 743             $content .= '<div style="text-align: center;"><a href="'.calendar_get_link_href(CALENDAR_URL.'view.php?view=month'.$courseid.'&amp;', 1, $data['m'], $data['y']).'">'.userdate($time, get_string('strftimemonthyear'))."</a></div>\n";
 744         break;
 745         case 'month':
 746             list($prevmonth, $prevyear) = calendar_sub_month($data['m'], $data['y']);
 747             list($nextmonth, $nextyear) = calendar_add_month($data['m'], $data['y']);
 748             $prevdate = make_timestamp($prevyear, $prevmonth, 1);
 749             $nextdate = make_timestamp($nextyear, $nextmonth, 1);
 750             $content .= "\n".'<div class="calendar-controls">';
 751             $content .= calendar_get_link_previous(userdate($prevdate, get_string('strftimemonthyear')), 'view.php?view=month'.$courseid.'&amp;', 1, $prevmonth, $prevyear);
 752             $content .= '<span class="hide"> | </span><span class="current">'.userdate($time, get_string('strftimemonthyear'))."</span>\n";
 753             $content .= '<span class="hide"> | </span>'.calendar_get_link_next(userdate($nextdate, get_string('strftimemonthyear')), 'view.php?view=month'.$courseid.'&amp;', 1, $nextmonth, $nextyear);
 754             $content .= "<span class=\"clearer\"><!-- --></span></div>\n";
 755         break;
 756         case 'day':
 757             $data['d'] = $date['mday']; // Just for convenience
 758             $prevdate = usergetdate(make_timestamp($data['y'], $data['m'], $data['d'] - 1));
 759             $nextdate = usergetdate(make_timestamp($data['y'], $data['m'], $data['d'] + 1));
 760             $prevname = calendar_wday_name($CALENDARDAYS[$prevdate['wday']]);
 761             $nextname = calendar_wday_name($CALENDARDAYS[$nextdate['wday']]);
 762             $content .= "\n".'<div class="calendar-controls">';
 763             $content .= calendar_get_link_previous($prevname, 'view.php?view=day'.$courseid.'&amp;', $prevdate['mday'], $prevdate['mon'], $prevdate['year']);
 764
 765             // Get the format string
 766             $text = get_string('strftimedaydate');
 767             /*
 768             // Regexp hackery to make a link out of the month/year part
 769             $text = ereg_replace('(%B.+%Y|%Y.+%B|%Y.+%m[^ ]+)', '<a href="'.calendar_get_link_href('view.php?view=month&amp;', 1, $data['m'], $data['y']).'">\\1</a>', $text);
 770             $text = ereg_replace('(F.+Y|Y.+F|Y.+m[^ ]+)', '<a href="'.calendar_get_link_href('view.php?view=month&amp;', 1, $data['m'], $data['y']).'">\\1</a>', $text);
 771             */
 772             // Replace with actual values and lose any day leading zero
 773             $text = userdate($time, $text);
 774             // Print the actual thing
 775             $content .= '<span class="hide"> | </span><span class="current">'.$text.'</span>';
 776
 777             $content .= '<span class="hide"> | </span>'. calendar_get_link_next($nextname, 'view.php?view=day'.$courseid.'&amp;', $nextdate['mday'], $nextdate['mon'], $nextdate['year']);
 778             $content .= "<span class=\"clearer\"><!-- --></span></div>\n";
 779         break;
 780     }
 781     return $content;
 782 }
 783
 784 function calendar_filter_controls($type, $vars = NULL, $course = NULL, $courses = NULL) {
 785     global $CFG, $SESSION, $USER;
 786
 787     $groupevents = true;
 788     $getvars = '';
 789
 790     $id = optional_param( 'id',0,PARAM_INT );
 791
 792     switch($type) {
 793         case 'event':
 794         case 'upcoming':
 795         case 'day':
 796         case 'month':
 797             $getvars = '&amp;from='.$type;
 798         break;
 799         case 'course':
 800             if ($id > 0) {
 801                 $getvars = '&amp;from=course&amp;id='.$id;
 802             } else {
 803                 $getvars = '&amp;from=course';
 804             }
 805             if (isset($course->groupmode) and $course->groupmode == NOGROUPS and $course->groupmodeforce) {
 806                 $groupevents = false;
 807             }
 808         break;
 809     }
 810
 811     if (!empty($vars)) {
 812         $getvars .= '&amp;'.$vars;
 813     }
 814
 815     $content = '<table>';
 816
 817     $content .= '<tr>';
 818     if($SESSION->cal_show_global) {
 819         $content .= '<td class="eventskey event_global" style="width: 11px;"><img src="'.$CFG->pixpath.'/t/hide.gif" class="iconsmall" alt="'.get_string('hide').'" title="'.get_string('tt_hideglobal', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".CALENDAR_URL.'set.php?var=showglobal'.$getvars."'".'" /></td>';
 820         $content .= '<td><a href="'.CALENDAR_URL.'set.php?var=showglobal'.$getvars.'" title="'.get_string('tt_hideglobal', 'calendar').'">'.get_string('global', 'calendar').'</a></td>'."\n";
 821     } else {
 822         $content .= '<td style="width: 11px;"><img src="'.$CFG->pixpath.'/t/show.gif" class="iconsmall" alt="'.get_string('show').'" title="'.get_string('tt_showglobal', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".CALENDAR_URL.'set.php?var=showglobal'.$getvars."'".'" /></td>';
 823         $content .= '<td><a href="'.CALENDAR_URL.'set.php?var=showglobal'.$getvars.'" title="'.get_string('tt_showglobal', 'calendar').'">'.get_string('global', 'calendar').'</a></td>'."\n";
 824     }
 825     if($SESSION->cal_show_course) {
 826         $content .= '<td class="eventskey event_course" style="width: 11px;"><img src="'.$CFG->pixpath.'/t/hide.gif" class="iconsmall" alt="'.get_string('hide').'" title="'.get_string('tt_hidecourse', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".CALENDAR_URL.'set.php?var=showcourses'.$getvars."'".'" /></td>';
 827         $content .= '<td><a href="'.CALENDAR_URL.'set.php?var=showcourses'.$getvars.'" title="'.get_string('tt_hidecourse', 'calendar').'">'.get_string('course', 'calendar').'</a></td>'."\n";
 828     } else {
 829         $content .= '<td style="width: 11px;"><img src="'.$CFG->pixpath.'/t/show.gif" class="iconsmall" alt="'.get_string('hide').'" title="'.get_string('tt_showcourse', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".CALENDAR_URL.'set.php?var=showcourses'.$getvars."'".'" /></td>';
 830         $content .= '<td><a href="'.CALENDAR_URL.'set.php?var=showcourses'.$getvars.'" title="'.get_string('tt_showcourse', 'calendar').'">'.get_string('course', 'calendar').'</a></td>'."\n";
 831
 832     }
 833
 834
 835     if(!empty($USER->id) && !isguest()) {
 836         $content .= "</tr>\n<tr>";
 837
 838         if($groupevents) {
 839             // This course MIGHT have group events defined, so show the filter
 840             if($SESSION->cal_show_groups) {
 841                 $content .= '<td class="eventskey event_group" style="width: 11px;"><img src="'.$CFG->pixpath.'/t/hide.gif" class="iconsmall" alt="'.get_string('hide').'" title="'.get_string('tt_hidegroups', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".CALENDAR_URL.'set.php?var=showgroups'.$getvars."'".'" /></td>';
 842                 $content .= '<td><a href="'.CALENDAR_URL.'set.php?var=showgroups'.$getvars.'" title="'.get_string('tt_hidegroups', 'calendar').'">'.get_string('group', 'calendar').'</a></td>'."\n";
 843             } else {
 844                 $content .= '<td style="width: 11px;"><img src="'.$CFG->pixpath.'/t/show.gif" class="iconsmall" alt="'.get_string('show').'" title="'.get_string('tt_showgroups', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".CALENDAR_URL.'set.php?var=showgroups'.$getvars."'".'" /></td>';
 845                 $content .= '<td><a href="'.CALENDAR_URL.'set.php?var=showgroups'.$getvars.'" title="'.get_string('tt_showgroups', 'calendar').'">'.get_string('group', 'calendar').'</a></td>'."\n";
 846             }
 847         } else {
 848             // This course CANNOT have group events, so lose the filter
 849             $content .= '<td style="width: 11px;"></td><td>&nbsp;</td>'."\n";
 850         }
 851         if($SESSION->cal_show_user) {
 852             $content .= '<td class="eventskey event_user" style="width: 11px;"><img src="'.$CFG->pixpath.'/t/hide.gif" class="iconsmall" alt="'.get_string('hide').'" title="'.get_string('tt_hideuser', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".CALENDAR_URL.'set.php?var=showuser'.$getvars."'".'" /></td>';
 853             $content .= '<td><a href="'.CALENDAR_URL.'set.php?var=showuser'.$getvars.'" title="'.get_string('tt_hideuser', 'calendar').'">'.get_string('user', 'calendar').'</a></td>'."\n";
 854         } else {
 855             $content .= '<td style="width: 11px;"><img src="'.$CFG->pixpath.'/t/show.gif" class="iconsmall" alt="'.get_string('show').'" title="'.get_string('tt_showuser', 'calendar').'" style="cursor:pointer" onclick="location.href='."'".CALENDAR_URL.'set.php?var=showuser'.$getvars."'".'" /></td>';
 856             $content .= '<td><a href="'.CALENDAR_URL.'set.php?var=showuser'.$getvars.'" title="'.get_string('tt_showuser', 'calendar').'">'.get_string('user', 'calendar').'</a></td>'."\n";
 857         }
 858     }
 859     $content .= "</tr>\n</table>\n";
 860
 861     return $content;
 862 }
 863
 864 function calendar_day_representation($tstamp, $now = false, $usecommonwords = true) {
 865
 866     static $shortformat;
 867     if(empty($shortformat)) {
 868         $shortformat = get_string('strftimedayshort');
 869     }
 870
 871     if($now === false) {
 872         $now = time();
 873     }
 874
 875     // To have it in one place, if a change is needed
 876     $formal = userdate($tstamp, $shortformat);
 877
 878     $datestamp = usergetdate($tstamp);
 879     $datenow   = usergetdate($now);
 880
 881     if($usecommonwords == false) {
 882         // We don't want words, just a date
 883         return $formal;
 884     }
 885     else if($datestamp['year'] == $datenow['year'] && $datestamp['yday'] == $datenow['yday']) {
 886         // Today
 887         return get_string('today', 'calendar');
 888     }
 889     else if(
 890         ($datestamp['year'] == $datenow['year'] && $datestamp['yday'] == $datenow['yday'] - 1 ) ||
 891         ($datestamp['year'] == $datenow['year'] - 1 && $datestamp['mday'] == 31 && $datestamp['mon'] == 12 && $datenow['yday'] == 1)
 892         ) {
 893         // Yesterday
 894         return get_string('yesterday', 'calendar');
 895     }
 896     else if(
 897         ($datestamp['year'] == $datenow['year'] && $datestamp['yday'] == $datenow['yday'] + 1 ) ||
 898         ($datestamp['year'] == $datenow['year'] + 1 && $datenow['mday'] == 31 && $datenow['mon'] == 12 && $datestamp['yday'] == 1)
 899         ) {
 900         // Tomorrow
 901         return get_string('tomorrow', 'calendar');
 902     }
 903     else {
 904         return $formal;
 905     }
 906 }
 907
 908 function calendar_time_representation($time) {
 909     static $langtimeformat = NULL;
 910     if($langtimeformat === NULL) {
 911         $langtimeformat = get_string('strftimetime');
 912     }
 913     $timeformat = get_user_preferences('calendar_timeformat');
 914     if(empty($timeformat)){
 915         $timeformat = get_config(NULL,'calendar_site_timeformat');
 916     }
 917     // The ? is needed because the preference might be present, but empty
 918     return userdate($time, empty($timeformat) ? $langtimeformat : $timeformat);
 919 }
 920
 921 /**
 922  * TODO document
 923  */
 924 function calendar_get_link_href($linkbase, $d, $m, $y) {
 925     if(empty($linkbase)) return '';
 926     $paramstr = '';
 927     if(!empty($d)) $paramstr .= '&amp;cal_d='.$d;
 928     if(!empty($m)) $paramstr .= '&amp;cal_m='.$m;
 929     if(!empty($y)) $paramstr .= '&amp;cal_y='.$y;
 930     if(!empty($paramstr)) $paramstr = substr($paramstr, 5);
 931     return $linkbase.$paramstr;
 932 }
 933
 934 /**
 935  * TODO document
 936  */
 937 function calendar_get_link_tag($text, $linkbase, $d, $m, $y) {
 938     $href = calendar_get_link_href($linkbase, $d, $m, $y);
 939     if(empty($href)) return $text;
 940     return '<a href="'.$href.'">'.$text.'</a>';
 941 }
 942
 943 /**
 944  * Build and return a previous month HTML link, with an arrow.
 945  * @param string $text The text label.
 946  * @param string $linkbase The URL stub.
 947  * @param int $d $m $y Day of month, month and year numbers.
 948  * @param bool $accesshide Default visible, or hide from all except screenreaders.
 949  * @return string HTML string.
 950  */
 951 function calendar_get_link_previous($text, $linkbase, $d, $m, $y, $accesshide=false) {
 952     $href = calendar_get_link_href($linkbase, $d, $m, $y);
 953     if(empty($href)) return $text;
 954     return link_arrow_left($text, $href, $accesshide, 'previous');
 955 }
 956
 957 /**
 958  * Build and return a next month HTML link, with an arrow.
 959  * @param string $text The text label.
 960  * @param string $linkbase The URL stub.
 961  * @param int $d $m $y Day of month, month and year numbers.
 962  * @param bool $accesshide Default visible, or hide from all except screenreaders.
 963  * @return string HTML string.
 964  */
 965 function calendar_get_link_next($text, $linkbase, $d, $m, $y, $accesshide=false) {
 966     $href = calendar_get_link_href($linkbase, $d, $m, $y);
 967     if(empty($href)) return $text;
 968     return link_arrow_right($text, $href, $accesshide, 'next');
 969 }
 970
 971 function calendar_wday_name($englishname) {
 972     return get_string(strtolower($englishname), 'calendar');
 973 }
 974
 975 function calendar_days_in_month($month, $year) {
 976    return intval(date('t', mktime(0, 0, 0, $month, 1, $year)));
 977 }
 978
 979 function calendar_get_sideblock_upcoming($events, $linkhref = NULL) {
 980     $content = '';
 981     $lines = count($events);
 982     if (!$lines) {
 983         return $content;
 984     }
 985
 986     for ($i = 0; $i < $lines; ++$i) {
 987         if (!isset($events[$i]->time)) {   // Just for robustness
 988             continue;
 989         }
 990         $events[$i] = calendar_add_event_metadata($events[$i]);
 991         $content .= '<div class="event"><span class="icon c0">'.$events[$i]->icon.'</span> ';
 992         if (!empty($events[$i]->referer)) {
 993             // That's an activity event, so let's provide the hyperlink
 994             $content .= $events[$i]->referer;
 995         } else {
 996             if(!empty($linkhref)) {
 997                 $ed = usergetdate($events[$i]->timestart);
 998                 $href = calendar_get_link_href(CALENDAR_URL.$linkhref, $ed['mday'], $ed['mon'], $ed['year']);
 999                 $content .= '<a href="'.$href.'#event_'.$events[$i]->id.'">'.$events[$i]->name.'</a>';
1000             }
1001             else {
1002                 $content .= $events[$i]->name;
1003             }
1004         }
1005         $events[$i]->time = str_replace('&raquo;', '<br />&raquo;', $events[$i]->time);
1006         $content .= '<div class="date">'.$events[$i]->time.'</div></div>';
1007         if ($i < $lines - 1) $content .= '<hr />';
1008     }
1009
1010     return $content;
1011 }
1012
1013 function calendar_add_month($month, $year) {
1014     if($month == 12) {
1015         return array(1, $year + 1);
1016     }
1017     else {
1018         return array($month + 1, $year);
1019     }
1020 }
1021
1022 function calendar_sub_month($month, $year) {
1023     if($month == 1) {
1024         return array(12, $year - 1);
1025     }
1026     else {
1027         return array($month - 1, $year);
1028     }
1029 }
1030
1031 function calendar_events_by_day($events, $month, $year, &$eventsbyday, &$durationbyday, &$typesbyday, &$courses) {
1032     $eventsbyday = array();
1033     $typesbyday = array();
1034     $durationbyday = array();
1035
1036     if($events === false) {
1037         return;
1038     }
1039
1040     foreach($events as $event) {
1041
1042         $startdate = usergetdate($event->timestart);
1043         // Set end date = start date if no duration
1044         if ($event->timeduration) {
1045             $enddate   = usergetdate($event->timestart + $event->timeduration - 1);
1046         } else {
1047             $enddate = $startdate;
1048         }
1049
1050         // Simple arithmetic: $year * 13 + $month is a distinct integer for each distinct ($year, $month) pair
1051         if(!($startdate['year'] * 13 + $startdate['mon'] <= $year * 13 + $month) && ($enddate['year'] * 13 + $enddate['mon'] >= $year * 13 + $month)) {
1052             // Out of bounds
1053             continue;
1054         }
1055
1056         $eventdaystart = intval($startdate['mday']);
1057
1058         if($startdate['mon'] == $month && $startdate['year'] == $year) {
1059             // Give the event to its day
1060             $eventsbyday[$eventdaystart][] = $event->id;
1061
1062             // Mark the day as having such an event
1063             if($event->courseid == SITEID && $event->groupid == 0) {
1064                 $typesbyday[$eventdaystart]['startglobal'] = true;
1065                 // Set event class for global event
1066                 $events[$event->id]->class = 'event_global';
1067             }
1068             else if($event->courseid != 0 && $event->courseid != SITEID && $event->groupid == 0) {
1069                 $typesbyday[$eventdaystart]['startcourse'] = true;
1070                 // Set event class for course event
1071                 $events[$event->id]->class = 'event_course';
1072             }
1073             else if($event->groupid) {
1074                 $typesbyday[$eventdaystart]['startgroup'] = true;
1075                 // Set event class for group event
1076                 $events[$event->id]->class = 'event_group';
1077             }
1078             else if($event->userid) {
1079                 $typesbyday[$eventdaystart]['startuser'] = true;
1080                 // Set event class for user event
1081                 $events[$event->id]->class = 'event_user';
1082             }
1083         }
1084
1085         if($event->timeduration == 0) {
1086             // Proceed with the next
1087             continue;
1088         }
1089
1090         // The event starts on $month $year or before. So...
1091         $lowerbound = $startdate['mon'] == $month && $startdate['year'] == $year ? intval($startdate['mday']) : 0;
1092
1093         // Also, it ends on $month $year or later...
1094         $upperbound = $enddate['mon'] == $month && $enddate['year'] == $year ? intval($enddate['mday']) : calendar_days_in_month($month, $year);
1095
1096         // Mark all days between $lowerbound and $upperbound (inclusive) as duration
1097         for($i = $lowerbound + 1; $i <= $upperbound; ++$i) {
1098             $durationbyday[$i][] = $event->id;
1099             if($event->courseid == SITEID && $event->groupid == 0) {
1100                 $typesbyday[$i]['durationglobal'] = true;
1101             }
1102             else if($event->courseid != 0 && $event->courseid != SITEID && $event->groupid == 0) {
1103                 $typesbyday[$i]['durationcourse'] = true;
1104             }
1105             else if($event->groupid) {
1106                 $typesbyday[$i]['durationgroup'] = true;
1107             }
1108             else if($event->userid) {
1109                 $typesbyday[$i]['durationuser'] = true;
1110             }
1111         }
1112
1113     }
1114     return;
1115 }
1116
1117 function calendar_get_module_cached(&$coursecache, $modulename, $instance) {
1118     $module = get_coursemodule_from_instance($modulename, $instance);
1119
1120     if($module === false) return false;
1121     if(!calendar_get_course_cached($coursecache, $module->course)) {
1122         return false;
1123     }
1124     return $module;
1125 }
1126
1127 function calendar_get_course_cached(&$coursecache, $courseid) {
1128     global $COURSE;
1129     if (!isset($coursecache[$courseid])) {
1130         if ($courseid == $COURSE->id) {
1131             $coursecache[$courseid] = $COURSE;
1132         } else {
1133             $coursecache[$courseid] = get_record('course', 'id', $courseid);
1134         }
1135     }
1136     return $coursecache[$courseid];
1137 }
1138
1139 function calendar_session_vars($course=null) {
1140     global $SESSION, $USER;
1141
1142     if(!empty($USER->id) && isset($USER->realuser) && !isset($SESSION->cal_loggedinas)) {
1143         // We just logged in as someone else, update the filtering
1144         unset($SESSION->cal_users_shown);
1145         unset($SESSION->cal_courses_shown);
1146         $SESSION->cal_loggedinas = true;
1147         if(intval(get_user_preferences('calendar_persistflt', 0))) {
1148             calendar_set_filters_status(get_user_preferences('calendar_savedflt', 0xff));
1149         }
1150     }
1151     else if(!empty($USER->id) && !isset($USER->realuser) && isset($SESSION->cal_loggedinas)) {
1152         // We just logged back to our real self, update again
1153         unset($SESSION->cal_users_shown);
1154         unset($SESSION->cal_courses_shown);
1155         unset($SESSION->cal_loggedinas);
1156         if(intval(get_user_preferences('calendar_persistflt', 0))) {
1157             calendar_set_filters_status(get_user_preferences('calendar_savedflt', 0xff));
1158         }
1159     }
1160
1161     if(!isset($SESSION->cal_course_referer)) {
1162         $SESSION->cal_course_referer = 0;
1163     }
1164     if(!isset($SESSION->cal_show_global)) {
1165         $SESSION->cal_show_global = true;
1166     }
1167     if(!isset($SESSION->cal_show_groups)) {
1168         $SESSION->cal_show_groups = true;
1169     }
1170     if(!isset($SESSION->cal_show_course)) {
1171         $SESSION->cal_show_course = true;
1172     }
1173     if(!isset($SESSION->cal_show_user)) {
1174         $SESSION->cal_show_user = true;
1175     }
1176     if (isset($course)) {
1177         // speedup hack for calendar related blocks
1178         $SESSION->cal_courses_shown = array($course->id => $course);
1179     } else {
1180         $SESSION->cal_courses_shown = calendar_get_default_courses(true);
1181     }
1182     if(empty($SESSION->cal_users_shown)) {
1183         // The empty() instead of !isset() here makes a whole world of difference,
1184         // as it will automatically change to the user's id when the user first logs
1185         // in. With !isset(), it would never do that.
1186         $SESSION->cal_users_shown = !empty($USER->id) ? $USER->id : false;
1187     }
1188     else if(is_numeric($SESSION->cal_users_shown) && !empty($USER->id) && $SESSION->cal_users_shown != $USER->id) {
1189         // Follow the white rabbit, for example if a teacher logs in as a student
1190         $SESSION->cal_users_shown = $USER->id;
1191     }
1192 }
1193
1194 function calendar_overlib_html() {
1195     return '<div id="overDiv" style="position: absolute; visibility: hidden; z-index:1000;"></div>'
1196           .'<script type="text/javascript" src="'.CALENDAR_URL.'overlib.cfg.php"></script>';
1197 }
1198
1199 function calendar_set_referring_course($courseid) {
1200     global $SESSION;
1201     $SESSION->cal_course_referer = intval($courseid);
1202 }
1203
1204 function calendar_set_filters(&$courses, &$group, &$user, $courseeventsfrom = NULL, $groupeventsfrom = NULL, $ignorefilters = false) {
1205     global $SESSION, $USER, $CFG;
1206
1207     // Insidious bug-wannabe: setting $SESSION->cal_courses_shown to $course->id would cause
1208     // the code to function incorrectly UNLESS we convert it to an integer. One case where
1209     // PHP's loose type system works against us.
1210     if(is_string($SESSION->cal_courses_shown)) {
1211         $SESSION->cal_courses_shown = intval($SESSION->cal_courses_shown);
1212     }
1213     if($courseeventsfrom === NULL) {
1214         $courseeventsfrom = $SESSION->cal_courses_shown;
1215     }
1216
1217     // MDL-9059, $courseeventsfrom can be an int, or an array of ints, or an array of course objects
1218     // convert all to array of objects
1219     // we probably should do some clean up and make sure that session is set to use the proper form
1220     if (is_int($courseeventsfrom)) { // case of an int, e.g. calendar view page
1221         $c = array();
1222         $c[$courseeventsfrom] = get_record('course', 'id', $courseeventsfrom);
1223         $courseeventsfrom = $c;
1224     } else if (is_array($courseeventsfrom)) { // case of an array of ints, e.g. course home page
1225         foreach ($courseeventsfrom as $i=>$courseid) { // TODO: this seems wrong, the array is often constructed as [courseid] => 1 ???
1226             if (is_int($courseid)) {
1227                 $courseeventsfrom[$i] = get_record('course', 'id', $courseid);
1228             }
1229         }
1230     }
1231
1232     if($groupeventsfrom === NULL) {
1233         $groupeventsfrom = $SESSION->cal_courses_shown;
1234     }
1235
1236     if(($SESSION->cal_show_course && $SESSION->cal_show_global) || $ignorefilters) {
1237         if(is_int($courseeventsfrom)) {
1238             $courses = array(SITEID, $courseeventsfrom);
1239         }
1240         else if(is_array($courseeventsfrom)) {
1241             $courses = array_keys($courseeventsfrom);
1242             $courses[] = SITEID;
1243         }
1244     }
1245     else if($SESSION->cal_show_course) {
1246         if(is_int($courseeventsfrom)) {
1247             $courses = array($courseeventsfrom);
1248         }
1249         else if(is_array($courseeventsfrom)) {
1250             $courses = array_keys($courseeventsfrom);
1251         }
1252         $courses = array_diff($courses, array(SITEID));
1253     }
1254     else if($SESSION->cal_show_global) {
1255         $courses = array(SITEID);
1256     }
1257     else {
1258         $courses = false;
1259     }
1260     //BUG 6130 clean $courses array as SESSION has bad entries.
1261     // [pj] TODO: See if this has to do with my new change in get_default_courses and can be taken out
1262     if (is_array($courses)) {
1263         foreach ($courses as $index => $value) {
1264             if (empty($value)) unset($courses[$index]);
1265         }
1266
1267         // Sort courses for consistent colour highlighting
1268         // Effectively ignoring SITEID as setting as last course id
1269         $key = array_search(SITEID, $courses);
1270         if ($key !== false) {
1271             unset($courses[$key]);
1272             sort($courses);
1273             $courses[] = SITEID;
1274         } else {
1275             sort($courses);
1276         }
1277     }
1278
1279     if($SESSION->cal_show_user || $ignorefilters) {
1280         // This doesn't work for arrays yet (maybe someday it will)
1281         $user = $SESSION->cal_users_shown;
1282     }
1283     else {
1284         $user = false;
1285     }
1286     if($SESSION->cal_show_groups || $ignorefilters) {
1287         if(is_int($groupeventsfrom)) {
1288             $groupcourses = array($groupeventsfrom);
1289         }
1290         else if(is_array($groupeventsfrom)) {
1291             $groupcourses = array_keys($groupeventsfrom);
1292         }
1293
1294         // XXX TODO: not sure how to replace $CFG->calendar_adminseesall
1295         if(has_capability('moodle/calendar:manageentries', get_context_instance(CONTEXT_SYSTEM)) && !empty($CFG->calendar_adminseesall)) {
1296             $group = true;
1297         }
1298         else {
1299             $grouparray = array();
1300
1301             // We already have the courses to examine in $courses
1302             // For each course...
1303
1304             foreach($groupcourses as $courseid) {
1305
1306                 if (!isset($courseeventsfrom[$courseid]->context)) { // SHOULD be set MDL-11221
1307                     if (is_object($courseeventsfrom[$courseid])) {
1308                         $courseeventsfrom[$courseid]->context = get_context_instance(CONTEXT_COURSE, $courseid);
1309                     }
1310                 }
1311
1312                 // If the user is an editing teacher in there,
1313                 if (!empty($USER->id) && isset($courseeventsfrom[$courseid]->context) && has_capability('moodle/calendar:manageentries', $courseeventsfrom[$courseid]->context)) {
1314                     // If this course has groups, show events from all of them
1315                     if(is_int($groupeventsfrom)) {
1316                         if (is_object($courseeventsfrom[$courseid])) { // SHOULD be set MDL-11221
1317                             $courserecord = $courseeventsfrom[$courseid];
1318                         } else {
1319                             $courserecord = get_record('course', 'id', $courseid);
1320                         }
1321                         $courserecord = get_record('course', 'id', $courseid);
1322                         if ($courserecord->groupmode != NOGROUPS || !$courserecord->groupmodeforce) {
1323                             $groupids[] = $courseid;
1324                         }
1325                     }
1326                     else if(isset($SESSION->cal_courses_shown[$courseid]) && ($SESSION->cal_courses_shown[$courseid]->groupmode != NOGROUPS || !$SESSION->cal_courses_shown[$courseid]->groupmodeforce)) {
1327                         $groupids[] = $courseid;
1328                     }
1329                 }
1330
1331                 // Otherwise (not editing teacher) show events from the group he is a member of
1332                 else if(isset($USER->groupmember[$courseid])) {
1333                     //changed to 2D array
1334                     foreach ($USER->groupmember[$courseid] as $groupid){
1335                         $grouparray[] = $groupid;
1336                     }
1337                 }
1338             }
1339
1340             if (!empty($groupids)) {
1341                 $sql = "SELECT *
1342                         FROM {$CFG->prefix}groups
1343                         WHERE courseid IN (".implode(',', $groupids).')';
1344
1345                 if ($grouprecords= get_records_sql($sql)) {
1346                     foreach ($grouprecords as $grouprecord) {
1347                         $grouparray[] = $grouprecord->id;
1348                     }
1349                 }
1350             }
1351
1352             if(empty($grouparray)) {
1353                 $group = false;
1354             }
1355             else {
1356                 $group = $grouparray;
1357             }
1358         }
1359
1360     }
1361     else {
1362         $group = false;
1363     }
1364 }
1365
1366 function calendar_edit_event_allowed($event) {
1367
1368     global $USER;
1369
1370     // Must be logged in
1371     if (!isloggedin()) {
1372         return false;
1373     }
1374
1375     // can not be using guest account
1376     if ($USER->username == "guest") {
1377         return false;
1378     }
1379
1380     $sitecontext = get_context_instance(CONTEXT_SYSTEM);
1381     // if user has manageentries at site level, return true
1382     if (has_capability('moodle/calendar:manageentries', $sitecontext)) {
1383         return true;
1384     }
1385
1386     // if groupid is set, it's definitely a group event
1387     if ($event->groupid) {
1388         // Allow users to add/edit group events if:
1389         // 1) They have manageentries (= entries for whole course)
1390         // 2) They have managegroupentries AND are in the group
1391         $group = get_record('groups', 'id', $event->groupid);
1392         return $group && (
1393             has_capability('moodle/calendar:manageentries', get_context_instance(CONTEXT_COURSE, $group->courseid)) ||
1394             (has_capability('moodle/calendar:managegroupentries', get_context_instance(CONTEXT_COURSE, $group->courseid))
1395                 && groups_is_member($event->groupid)));
1396     } else if ($event->courseid) {
1397     // if groupid is not set, but course is set,
1398     // it's definiely a course event
1399         return has_capability('moodle/calendar:manageentries', get_context_instance(CONTEXT_COURSE, $event->courseid));
1400     } else if ($event->userid && $event->userid == $USER->id) {
1401     // if course is not set, but userid id set, it's a user event
1402         return (has_capability('moodle/calendar:manageownentries', $sitecontext));
1403     }
1404     return false;
1405 }
1406
1407 function calendar_get_default_courses($ignoreref = false) {
1408     global $USER, $CFG, $SESSION;
1409
1410     if(!empty($SESSION->cal_course_referer) && !$ignoreref) {
1411         return array($SESSION->cal_course_referer => 1);
1412     }
1413
1414     if(empty($USER->id)) {
1415         return array();
1416     }
1417
1418     $courses = array();
1419     if (has_capability('moodle/calendar:manageentries', get_context_instance(CONTEXT_SYSTEM))) {
1420         if (!empty($CFG->calendar_adminseesall)) {
1421             $courses = get_records_sql('SELECT id, 1 FROM '.$CFG->prefix.'course');
1422             return $courses;
1423         }
1424     }
1425
1426     if (isset($CFG->adminseesall)) {
1427         $courses = get_my_courses($USER->id, null, null, $CFG->adminseesall);
1428     }
1429     else {
1430         $courses = get_my_courses($USER->id, null, null, false);
1431     }
1432
1433     return $courses;
1434 }
1435
1436 function calendar_preferences_button() {
1437     global $CFG, $USER;
1438
1439     // Guests have no preferences
1440     if (empty($USER->id) || isguest()) {
1441         return '';
1442     }
1443
1444     return "<form $CFG->frametarget method=\"get\" ".
1445            " action=\"$CFG->wwwroot/calendar/preferences.php\">".
1446            "<div><input type=\"submit\" value=\"".get_string("preferences", "calendar")." ...\" /></div></form>";
1447 }
1448
1449 function calendar_format_event_time($event, $now, $morehref, $usecommonwords = true, $showtime=0) {
1450     $startdate = usergetdate($event->timestart);
1451     $enddate = usergetdate($event->timestart + $event->timeduration);
1452     $usermidnightstart = usergetmidnight($event->timestart);
1453
1454     if($event->timeduration) {
1455         // To avoid doing the math if one IF is enough :)
1456         $usermidnightend = usergetmidnight($event->timestart + $event->timeduration);
1457     }
1458     else {
1459         $usermidnightend = $usermidnightstart;
1460     }
1461
1462     // OK, now to get a meaningful display...
1463     // First of all we have to construct a human-readable date/time representation
1464
1465     if($event->timeduration) {
1466         // It has a duration
1467         if($usermidnightstart == $usermidnightend ||
1468            ($event->timestart == $usermidnightstart) && ($event->timeduration == 86400 || $event->timeduration == 86399) ||
1469            ($event->timestart + $event->timeduration <= $usermidnightstart + 86400)) {
1470             // But it's all on the same day
1471             $timestart = calendar_time_representation($event->timestart);
1472             $timeend = calendar_time_representation($event->timestart + $event->timeduration);
1473             $time = $timestart.' <strong>&raquo;</strong> '.$timeend;
1474
1475             if ($event->timestart == $usermidnightstart && ($event->timeduration == 86400 || $event->timeduration == 86399)) {
1476                 $time = get_string('allday', 'calendar');
1477             }
1478
1479             // Set printable representation
1480             if (!$showtime) {
1481                 $day = calendar_day_representation($event->timestart, $now, $usecommonwords);
1482                 $eventtime = calendar_get_link_tag($day, CALENDAR_URL.'view.php?view=day'.$morehref.'&amp;', $enddate['mday'], $enddate['mon'], $enddate['year']).', '.$time;
1483             } else {
1484                 $eventtime = $time;
1485             }
1486         } else {
1487             // It spans two or more days
1488             $daystart = calendar_day_representation($event->timestart, $now, $usecommonwords).', ';
1489             if ($showtime == $usermidnightstart) {
1490                 $daystart = '';
1491             }
1492             $timestart = calendar_time_representation($event->timestart);
1493             $dayend = calendar_day_representation($event->timestart + $event->timeduration, $now, $usecommonwords).', ';
1494             if ($showtime == $usermidnightend) {
1495                 $dayend = '';
1496             }
1497             $timeend = calendar_time_representation($event->timestart + $event->timeduration);
1498
1499             // Set printable representation
1500             if ($now >= $usermidnightstart && $now < ($usermidnightstart + 86400)) {
1501                 $eventtime = $timestart.' <strong>&raquo;</strong> '.calendar_get_link_tag($dayend, CALENDAR_URL.'view.php?view=day'.$morehref.'&amp;', $enddate['mday'], $enddate['mon'], $enddate['year']).
1502                 $timeend;
1503             } else {
1504                 $eventtime = calendar_get_link_tag($daystart, CALENDAR_URL.'view.php?view=day'.$morehref.'&amp;', $startdate['mday'], $startdate['mon'], $startdate['year']).
1505                 $timestart.' <strong>&raquo;</strong> '.calendar_get_link_tag($dayend, CALENDAR_URL.'view.php?view=day'.$morehref.'&amp;', $enddate['mday'], $enddate['mon'], $enddate['year']).
1506                 $timeend;
1507             }
1508         }
1509     } else {
1510         $time = ' ';
1511
1512         // Set printable representation
1513         if (!$showtime) {
1514             $day = calendar_day_representation($event->timestart, $now, $usecommonwords);
1515             $eventtime = calendar_get_link_tag($day, CALENDAR_URL.'view.php?view=day'.$morehref.'&amp;', $startdate['mday'], $startdate['mon'], $startdate['year']).trim($time);
1516         } else {
1517             $eventtime = $time;
1518         }
1519     }
1520
1521     if($event->timestart + $event->timeduration < $now) {
1522         // It has expired
1523         $eventtime = '<span class="dimmed_text">'.str_replace(' href=', ' class="dimmed" href=', $eventtime).'</span>';
1524     }
1525
1526     return $eventtime;
1527 }
1528
1529 function calendar_print_month_selector($name, $selected) {
1530
1531     $months = array();
1532
1533     for ($i=1; $i<=12; $i++) {
1534         $months[$i] = userdate(gmmktime(12, 0, 0, $i, 15, 2000), '%B');
1535     }
1536
1537     choose_from_menu($months, $name, $selected, '');
1538 }
1539
1540 function calendar_get_filters_status() {
1541     global $SESSION;
1542
1543     $status = 0;
1544     if($SESSION->cal_show_global) {
1545         $status += 1;
1546     }
1547     if($SESSION->cal_show_course) {
1548         $status += 2;
1549     }
1550     if($SESSION->cal_show_groups) {
1551         $status += 4;
1552     }
1553     if($SESSION->cal_show_user) {
1554         $status += 8;
1555     }
1556     return $status;
1557 }
1558
1559 function calendar_set_filters_status($packed_bitfield) {
1560     global $SESSION, $USER;
1561
1562     if(!isset($USER) || empty($USER->id)) {
1563         return false;
1564     }
1565
1566     $SESSION->cal_show_global = ($packed_bitfield & 1);
1567     $SESSION->cal_show_course = ($packed_bitfield & 2);
1568     $SESSION->cal_show_groups = ($packed_bitfield & 4);
1569     $SESSION->cal_show_user   = ($packed_bitfield & 8);
1570
1571     return true;
1572 }
1573
1574 function calendar_get_allowed_types(&$allowed) {
1575     global $USER, $CFG, $SESSION;
1576     $sitecontext = get_context_instance(CONTEXT_SYSTEM);
1577     $allowed->user = has_capability('moodle/calendar:manageownentries', $sitecontext);
1578     $allowed->groups = false; // This may change just below
1579     $allowed->courses = false; // This may change just below
1580     $allowed->site = has_capability('moodle/calendar:manageentries', get_context_instance(CONTEXT_COURSE, SITEID));
1581
1582     if(!empty($SESSION->cal_course_referer) && $SESSION->cal_course_referer != SITEID) {
1583         $course = get_record('course', 'id', $SESSION->cal_course_referer);
1584         $coursecontext = get_context_instance(CONTEXT_COURSE, $SESSION->cal_course_referer);
1585
1586         if(has_capability('moodle/calendar:manageentries', $coursecontext)) {
1587             $allowed->courses = array($course->id => 1);
1588
1589             if($course->groupmode != NOGROUPS || !$course->groupmodeforce) {
1590                 $allowed->groups = groups_get_all_groups($SESSION->cal_course_referer);
1591             }
1592         } else if(has_capability('moodle/calendar:managegroupentries', $coursecontext)) {
1593             if($course->groupmode != NOGROUPS || !$course->groupmodeforce) {
1594                 $allowed->groups = groups_get_all_groups($SESSION->cal_course_referer, $USER->id);
1595             }
1596         }
1597     }
1598 }
1599
1600 /**
1601  * see if user can add calendar entries at all
1602  * used to print the "New Event" button
1603  * @return bool
1604  */
1605 function calendar_user_can_add_event() {
1606     calendar_get_allowed_types($allowed);
1607     return (bool)($allowed->user || $allowed->groups || $allowed->courses || $allowed->site);
1608 }
1609 ?>