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   1  <?php
   2  
   3  // This file is part of Moodle - http://moodle.org/
   4  //
   5  // Moodle is free software: you can redistribute it and/or modify
   6  // it under the terms of the GNU General Public License as published by
   7  // the Free Software Foundation, either version 3 of the License, or
   8  // (at your option) any later version.
   9  //
  10  // Moodle is distributed in the hope that it will be useful,
  11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  // GNU General Public License for more details.
  14  //
  15  // You should have received a copy of the GNU General Public License
  16  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  17  
  18  /**
  19   * This file contains the renderers for the calendar within Moodle
  20   *
  21   * @copyright 2010 Sam Hemelryk
  22   * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23   * @package calendar
  24   */
  25  
  26  if (!defined('MOODLE_INTERNAL')) {
  27      die('Direct access to this script is forbidden.');    ///  It must be included from a Moodle page
  28  }
  29  
  30  /**
  31   * The primary renderer for the calendar.
  32   */
  33  class core_calendar_renderer extends plugin_renderer_base {
  34  
  35      /**
  36       * Creates a basic export form
  37       *
  38       * @param bool $allowthisweek
  39       * @param bool $allownextweek
  40       * @param bool $allownextmonth
  41       * @param int $userid
  42       * @param string $authtoken
  43       * @return string
  44       */
  45      public function basic_export_form($allowthisweek, $allownextweek, $allownextmonth, $userid, $authtoken) {
  46          global $CFG;
  47  
  48          $output  = html_writer::tag('div', get_string('export', 'calendar'), array('class'=>'header'));
  49          $output .= html_writer::start_tag('fieldset');
  50          $output .= html_writer::tag('legend', get_string('commontasks', 'calendar'));
  51          $output .= html_writer::start_tag('form', array('action'=>new moodle_url('/calendar/export_execute.php'), 'method'=>'get'));
  52  
  53          $output .= html_writer::tag('div', get_string('iwanttoexport', 'calendar'));
  54  
  55          $output .= html_writer::start_tag('div', array('class'=>'indent'));
  56          $output .= html_writer::empty_tag('input', array('type'=>'radio', 'name'=>'preset_what', 'id'=>'pw_all', 'value'=>'all', 'checked'=>'checked'));
  57          $output .= html_writer::tag('label', get_string('eventsall', 'calendar'), array('for'=>'pw_all'));
  58          $output .= html_writer::empty_tag('br');
  59          $output .= html_writer::empty_tag('input', array('type'=>'radio', 'name'=>'preset_what', 'id'=>'pw_course', 'value'=>'courses'));
  60          $output .= html_writer::tag('label', get_string('eventsrelatedtocourses', 'calendar'), array('for'=>'pw_course'));
  61          $output .= html_writer::empty_tag('br');
  62          $output .= html_writer::end_tag('div');
  63  
  64          $output .= html_writer::tag('div', get_string('for', 'calendar').':');
  65  
  66          $output .= html_writer::start_tag('div', array('class'=>'indent'));
  67          if ($allowthisweek) {
  68              $output .= html_writer::empty_tag('input', array('type'=>'radio', 'name'=>'preset_time', 'id'=>'pt_wknow', 'value'=>'weeknow', 'checked'=>'checked'));
  69              $output .= html_writer::tag('label', get_string('weekthis', 'calendar'), array('for'=>'pt_wknow'));
  70              $output .= html_writer::empty_tag('br');
  71          }
  72          if ($allownextweek) {
  73              $output .= html_writer::empty_tag('input', array('type'=>'radio', 'name'=>'preset_time', 'id'=>'pt_wknext', 'value'=>'weeknext'));
  74              $output .= html_writer::tag('label', get_string('weeknext', 'calendar'), array('for'=>'pt_wknext'));
  75              $output .= html_writer::empty_tag('br');
  76          }
  77          $output .= html_writer::empty_tag('input', array('type'=>'radio', 'name'=>'preset_time', 'id'=>'pt_monnow', 'value'=>'monthnow'));
  78          $output .= html_writer::tag('label', get_string('monththis', 'calendar'), array('for'=>'pt_monnow'));
  79          $output .= html_writer::empty_tag('br');
  80          if ($allownextmonth) {
  81              $output .= html_writer::empty_tag('input', array('type'=>'radio', 'name'=>'preset_time', 'id'=>'pt_monnext', 'value'=>'monthnext'));
  82              $output .= html_writer::tag('label', get_string('monthnext', 'calendar'), array('for'=>'pt_monnext'));
  83              $output .= html_writer::empty_tag('br');
  84          }
  85          $output .= html_writer::empty_tag('input', array('type'=>'radio', 'name'=>'preset_time', 'id'=>'pt_recupc', 'value'=>'recentupcoming'));
  86          $output .= html_writer::tag('label', get_string('recentupcoming', 'calendar'), array('for'=>'pt_recupc'));
  87          $output .= html_writer::empty_tag('br');
  88  
  89          if ($CFG->calendar_customexport) {
  90              $a = new stdClass();
  91              $now = time();
  92              $time = $now - $CFG->calendar_exportlookback * DAYSECS;
  93              $a->timestart = userdate($time, get_string('strftimedatefullshort', 'langconfig'));
  94              $time = $now + $CFG->calendar_exportlookahead * DAYSECS;
  95              $a->timeend = userdate($time, get_string('strftimedatefullshort', 'langconfig'));
  96              $output .= html_writer::empty_tag('input', array('type' => 'radio', 'name' => 'preset_time', 'id' => 'pt_custom', 'value' => 'custom'));
  97              $output .= html_writer::tag('label', get_string('customexport', 'calendar', $a), array('for' => 'pt_custom'));
  98              $output .= html_writer::empty_tag('br');
  99          }
 100  
 101          $output .= html_writer::end_tag('div');
 102          $output .= html_writer::start_tag('div', array('class'=>'rightalign'));
 103          $output .= html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>'cal_d', 'value'=>''));
 104          $output .= html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>'cal_m', 'value'=>''));
 105          $output .= html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>'cal_y', 'value'=>''));
 106          $output .= html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>'userid', 'value'=>$userid));
 107          $output .= html_writer::empty_tag('input', array('type'=>'hidden', 'name'=>'authtoken', 'value'=>$authtoken));
 108  
 109          $output .= html_writer::empty_tag('input', array('type'=>'submit', 'name' => 'generateurl', 'id'=>'generateurl', 'value'=>get_string('generateurlbutton', 'calendar')));
 110          $output .= html_writer::empty_tag('input', array('type'=>'submit', 'value'=>get_string('exportbutton', 'calendar')));
 111  
 112          $output .= html_writer::end_tag('div');
 113  
 114          $output .= html_writer::end_tag('form');
 115          $output .= html_writer::end_tag('fieldset');
 116  
 117          $output .= html_writer::start_tag('div', array('id'=>'urlbox', 'style'=>'display:none;'));
 118          $output .= html_writer::tag('p', get_string('urlforical', 'calendar'));
 119          $output .= html_writer::tag('div', '', array('id'=>'url', 'style'=>'overflow:scroll;width:650px;'));
 120          $output .= html_writer::end_tag('div');
 121  
 122          return $output;
 123      }
 124  
 125      /**
 126       * Starts the standard layout for the page
 127       *
 128       * @return string
 129       */
 130      public function start_layout() {
 131          return html_writer::start_tag('div', array('class'=>'maincalendar'));
 132      }
 133  
 134      /**
 135       * Creates the remainder of the layout
 136       *
 137       * @return string
 138       */
 139      public function complete_layout() {
 140          return html_writer::end_tag('div');
 141      }
 142  
 143      /**
 144       * Produces the content for the filters block (pretend block)
 145       *
 146       * @param int $courseid
 147       * @param int $day
 148       * @param int $month
 149       * @param int $year
 150       * @param int $view
 151       * @param int $courses
 152       * @return string
 153       */
 154      public function fake_block_filters($courseid, $day, $month, $year, $view, $courses) {
 155          $returnurl = $this->page->url;
 156          $returnurl->param('course', $courseid);
 157          return html_writer::tag('div', calendar_filter_controls($returnurl), array('class'=>'calendar_filters filters'));
 158      }
 159  
 160      /**
 161       * Produces the content for the three months block (pretend block)
 162       *
 163       * This includes the previous month, the current month, and the next month
 164       *
 165       * @param calendar_information $calendar
 166       * @return string
 167       */
 168      public function fake_block_threemonths(calendar_information $calendar) {
 169          // Get the calendar type we are using.
 170          $calendartype = \core_calendar\type_factory::get_calendar_instance();
 171  
 172          $date = $calendartype->timestamp_to_date_array($calendar->time);
 173  
 174          $prevmonth = calendar_sub_month($date['mon'], $date['year']);
 175          $prevmonthtime = $calendartype->convert_to_gregorian($prevmonth[1], $prevmonth[0], 1);
 176          $prevmonthtime = make_timestamp($prevmonthtime['year'], $prevmonthtime['month'], $prevmonthtime['day'],
 177              $prevmonthtime['hour'], $prevmonthtime['minute']);
 178  
 179          $nextmonth = calendar_add_month($date['mon'], $date['year']);
 180          $nextmonthtime = $calendartype->convert_to_gregorian($nextmonth[1], $nextmonth[0], 1);
 181          $nextmonthtime = make_timestamp($nextmonthtime['year'], $nextmonthtime['month'], $nextmonthtime['day'],
 182              $nextmonthtime['hour'], $nextmonthtime['minute']);
 183  
 184          $content  = html_writer::start_tag('div', array('class' => 'minicalendarblock'));
 185          $content .= calendar_get_mini($calendar->courses, $calendar->groups, $calendar->users, false, false, 'display', $calendar->courseid, $prevmonthtime);
 186          $content .= html_writer::end_tag('div');
 187          $content .= html_writer::start_tag('div', array('class' => 'minicalendarblock'));
 188          $content .= calendar_get_mini($calendar->courses, $calendar->groups, $calendar->users, false, false, 'display', $calendar->courseid, $calendar->time);
 189          $content .= html_writer::end_tag('div');
 190          $content .= html_writer::start_tag('div', array('class' => 'minicalendarblock'));
 191          $content .= calendar_get_mini($calendar->courses, $calendar->groups, $calendar->users, false, false, 'display', $calendar->courseid, $nextmonthtime);
 192          $content .= html_writer::end_tag('div');
 193          return $content;
 194      }
 195  
 196      /**
 197       * Adds a pretent calendar block
 198       *
 199       * @param block_contents $bc
 200       * @param mixed $pos BLOCK_POS_RIGHT | BLOCK_POS_LEFT
 201       */
 202      public function add_pretend_calendar_block(block_contents $bc, $pos=BLOCK_POS_RIGHT) {
 203          $this->page->blocks->add_fake_block($bc, $pos);
 204      }
 205  
 206      /**
 207       * Creates a button to add a new event
 208       *
 209       * @param int $courseid
 210       * @param int $day
 211       * @param int $month
 212       * @param int $year
 213       * @param int $time the unixtime, used for multiple calendar support. The values $day,
 214       *     $month and $year are kept for backwards compatibility.
 215       * @return string
 216       */
 217      protected function add_event_button($courseid, $day = null, $month = null, $year = null, $time = null) {
 218          // If a day, month and year were passed then convert it to a timestamp. If these were passed
 219          // then we can assume the day, month and year are passed as Gregorian, as no where in core
 220          // should we be passing these values rather than the time. This is done for BC.
 221          if (!empty($day) && !empty($month) && !empty($year)) {
 222              if (checkdate($month, $day, $year)) {
 223                  $time = make_timestamp($year, $month, $day);
 224              } else {
 225                  $time = time();
 226              }
 227          } else if (empty($time)) {
 228              $time = time();
 229          }
 230  
 231          $output = html_writer::start_tag('div', array('class'=>'buttons'));
 232          $output .= html_writer::start_tag('form', array('action' => CALENDAR_URL . 'event.php', 'method' => 'get'));
 233          $output .= html_writer::start_tag('div');
 234          $output .= html_writer::empty_tag('input', array('type'=>'hidden', 'name' => 'action', 'value' => 'new'));
 235          $output .= html_writer::empty_tag('input', array('type'=>'hidden', 'name' => 'course', 'value' => $courseid));
 236          $output .= html_writer::empty_tag('input', array('type'=>'hidden', 'name' => 'time', 'value' => $time));
 237          $output .= html_writer::empty_tag('input', array('type'=>'submit', 'value' => get_string('newevent', 'calendar')));
 238          $output .= html_writer::end_tag('div');
 239          $output .= html_writer::end_tag('form');
 240          $output .= html_writer::end_tag('div');
 241          return $output;
 242      }
 243  
 244      /**
 245       * Displays the calendar for a single day
 246       *
 247       * @param calendar_information $calendar
 248       * @return string
 249       */
 250      public function show_day(calendar_information $calendar, moodle_url $returnurl = null) {
 251  
 252          if ($returnurl === null) {
 253              $returnurl = $this->page->url;
 254          }
 255  
 256          $events = calendar_get_upcoming($calendar->courses, $calendar->groups, $calendar->users, 1, 100, $calendar->timestamp_today());
 257  
 258          $output  = html_writer::start_tag('div', array('class'=>'header'));
 259          $output .= $this->course_filter_selector($returnurl, get_string('dayviewfor', 'calendar'));
 260          if (calendar_user_can_add_event($calendar->course)) {
 261              $output .= $this->add_event_button($calendar->course->id, 0, 0, 0, $calendar->time);
 262          }
 263          $output .= html_writer::end_tag('div');
 264          // Controls
 265          $output .= html_writer::tag('div', calendar_top_controls('day', array('id' => $calendar->courseid, 'time' => $calendar->time)), array('class'=>'controls'));
 266  
 267          if (empty($events)) {
 268              // There is nothing to display today.
 269              $output .= $this->output->heading(get_string('daywithnoevents', 'calendar'), 3);
 270          } else {
 271              $output .= html_writer::start_tag('div', array('class' => 'eventlist'));
 272              $underway = array();
 273              // First, print details about events that start today
 274              foreach ($events as $event) {
 275                  $event = new calendar_event($event);
 276                  $event->calendarcourseid = $calendar->courseid;
 277                  if ($event->timestart >= $calendar->timestamp_today() && $event->timestart <= $calendar->timestamp_tomorrow()-1) {  // Print it now
 278                      $event->time = calendar_format_event_time($event, time(), null, false, $calendar->timestamp_today());
 279                      $output .= $this->event($event);
 280                  } else {                                                                 // Save this for later
 281                      $underway[] = $event;
 282                  }
 283              }
 284  
 285              // Then, show a list of all events that just span this day
 286              if (!empty($underway)) {
 287                  $output .= $this->output->heading(get_string('spanningevents', 'calendar'), 3);
 288                  foreach ($underway as $event) {
 289                      $event->time = calendar_format_event_time($event, time(), null, false, $calendar->timestamp_today());
 290                      $output .= $this->event($event);
 291                  }
 292              }
 293  
 294              $output .= html_writer::end_tag('div');
 295          }
 296  
 297          return $output;
 298      }
 299  
 300      /**
 301       * Displays an event
 302       *
 303       * @param calendar_event $event
 304       * @param bool $showactions
 305       * @return string
 306       */
 307      public function event(calendar_event $event, $showactions=true) {
 308          global $CFG;
 309  
 310          $event = calendar_add_event_metadata($event);
 311          $context = $event->context;
 312          $output = '';
 313  
 314          if (!empty($event->icon)) {
 315              $output .= $event->icon;
 316          } else {
 317              $output .= $this->output->spacer(array('height' => 16, 'width' => 16));
 318          }
 319  
 320          if (!empty($event->referer)) {
 321              $output .= $this->output->heading($event->referer, 3, array('class' => 'referer'));
 322          } else {
 323              $output .= $this->output->heading(
 324                  format_string($event->name, false, array('context' => $context)),
 325                  3,
 326                  array('class' => 'name')
 327              );
 328          }
 329          if (!empty($event->courselink)) {
 330              $output .= html_writer::tag('div', $event->courselink, array('class' => 'course'));
 331          }
 332          // Show subscription source if needed.
 333          if (!empty($event->subscription) && $CFG->calendar_showicalsource) {
 334              if (!empty($event->subscription->url)) {
 335                  $source = html_writer::link($event->subscription->url, get_string('subsource', 'calendar', $event->subscription));
 336              } else {
 337                  // File based ical.
 338                  $source = get_string('subsource', 'calendar', $event->subscription);
 339              }
 340              $output .= html_writer::tag('div', $source, array('class' => 'subscription'));
 341          }
 342          if (!empty($event->time)) {
 343              $output .= html_writer::tag('span', $event->time, array('class' => 'date'));
 344          } else {
 345              $output .= html_writer::tag('span', calendar_time_representation($event->timestart), array('class' => 'date'));
 346          }
 347  
 348          $eventdetailshtml = '';
 349          $eventdetailsclasses = '';
 350  
 351          $eventdetailshtml .= format_text($event->description, $event->format, array('context' => $context));
 352          $eventdetailsclasses .= 'description';
 353          if (isset($event->cssclass)) {
 354              $eventdetailsclasses .= ' '.$event->cssclass;
 355          }
 356  
 357          $output .= html_writer::tag('div', $eventdetailshtml, array('class' => $eventdetailsclasses));
 358  
 359          if (calendar_edit_event_allowed($event) && $showactions) {
 360              if (empty($event->cmid)) {
 361                  $editlink = new moodle_url(CALENDAR_URL.'event.php', array('action'=>'edit', 'id'=>$event->id));
 362                  $deletelink = new moodle_url(CALENDAR_URL.'delete.php', array('id'=>$event->id));
 363                  if (!empty($event->calendarcourseid)) {
 364                      $editlink->param('course', $event->calendarcourseid);
 365                      $deletelink->param('course', $event->calendarcourseid);
 366                  }
 367              } else {
 368                  $editlink = new moodle_url('/course/mod.php', array('update'=>$event->cmid, 'return'=>true, 'sesskey'=>sesskey()));
 369                  $deletelink = null;
 370              }
 371  
 372              $commands  = html_writer::start_tag('div', array('class'=>'commands'));
 373              $commands .= html_writer::start_tag('a', array('href'=>$editlink));
 374              $commands .= html_writer::empty_tag('img', array('src'=>$this->output->pix_url('t/edit'), 'alt'=>get_string('tt_editevent', 'calendar'), 'title'=>get_string('tt_editevent', 'calendar')));
 375              $commands .= html_writer::end_tag('a');
 376              if ($deletelink != null) {
 377                  $commands .= html_writer::start_tag('a', array('href'=>$deletelink));
 378                  $commands .= html_writer::empty_tag('img', array('src'=>$this->output->pix_url('t/delete'), 'alt'=>get_string('tt_deleteevent', 'calendar'), 'title'=>get_string('tt_deleteevent', 'calendar')));
 379                  $commands .= html_writer::end_tag('a');
 380              }
 381              $commands .= html_writer::end_tag('div');
 382              $output .= $commands;
 383          }
 384          return html_writer::tag('div', $output , array('class' => 'event', 'id' => 'event_' . $event->id));
 385      }
 386  
 387      /**
 388       * Displays a month in detail
 389       *
 390       * @param calendar_information $calendar
 391       * @param moodle_url $returnurl the url to return to
 392       * @return string
 393       */
 394      public function show_month_detailed(calendar_information $calendar, moodle_url $returnurl  = null) {
 395          global $CFG;
 396  
 397          if (empty($returnurl)) {
 398              $returnurl = $this->page->url;
 399          }
 400  
 401          // Get the calendar type we are using.
 402          $calendartype = \core_calendar\type_factory::get_calendar_instance();
 403  
 404          // Store the display settings.
 405          $display = new stdClass;
 406          $display->thismonth = false;
 407  
 408          // Get the specified date in the calendar type being used.
 409          $date = $calendartype->timestamp_to_date_array($calendar->time);
 410          $thisdate = $calendartype->timestamp_to_date_array(time());
 411          if ($date['mon'] == $thisdate['mon'] && $date['year'] == $thisdate['year']) {
 412              $display->thismonth = true;
 413              $date = $thisdate;
 414              $calendar->time = time();
 415          }
 416  
 417          // Get Gregorian date for the start of the month.
 418          $gregoriandate = $calendartype->convert_to_gregorian($date['year'], $date['mon'], 1);
 419          // Store the gregorian date values to be used later.
 420          list($gy, $gm, $gd, $gh, $gmin) = array($gregoriandate['year'], $gregoriandate['month'], $gregoriandate['day'],
 421              $gregoriandate['hour'], $gregoriandate['minute']);
 422  
 423          // Get the starting week day for this month.
 424          $startwday = dayofweek(1, $date['mon'], $date['year']);
 425          // Get the days in a week.
 426          $daynames = calendar_get_days();
 427          // Store the number of days in a week.
 428          $numberofdaysinweek = $calendartype->get_num_weekdays();
 429  
 430          $display->minwday = calendar_get_starting_weekday();
 431          $display->maxwday = $display->minwday + ($numberofdaysinweek - 1);
 432          $display->maxdays = calendar_days_in_month($date['mon'], $date['year']);
 433  
 434          // These are used for DB queries, so we want unixtime, so we need to use Gregorian dates.
 435          $display->tstart = make_timestamp($gy, $gm, $gd, $gh, $gmin, 0);
 436          $display->tend = $display->tstart + ($display->maxdays * DAYSECS) - 1;
 437  
 438          // Align the starting weekday to fall in our display range
 439          // This is simple, not foolproof.
 440          if ($startwday < $display->minwday) {
 441              $startwday += $numberofdaysinweek;
 442          }
 443  
 444          // Get events from database
 445          $events = calendar_get_events($display->tstart, $display->tend, $calendar->users, $calendar->groups, $calendar->courses);
 446          if (!empty($events)) {
 447              foreach($events as $eventid => $event) {
 448                  $event = new calendar_event($event);
 449                  if (!empty($event->modulename)) {
 450                      $cm = get_coursemodule_from_instance($event->modulename, $event->instance);
 451                      if (!\core_availability\info_module::is_user_visible($cm, 0, false)) {
 452                          unset($events[$eventid]);
 453                      }
 454                  }
 455              }
 456          }
 457  
 458          // Extract information: events vs. time
 459          calendar_events_by_day($events, $date['mon'], $date['year'], $eventsbyday, $durationbyday, $typesbyday, $calendar->courses);
 460  
 461          $output  = html_writer::start_tag('div', array('class'=>'header'));
 462          $output .= $this->course_filter_selector($returnurl, get_string('detailedmonthviewfor', 'calendar'));
 463          if (calendar_user_can_add_event($calendar->course)) {
 464              $output .= $this->add_event_button($calendar->course->id, 0, 0, 0, $calendar->time);
 465          }
 466          $output .= html_writer::end_tag('div', array('class'=>'header'));
 467          // Controls
 468          $output .= html_writer::tag('div', calendar_top_controls('month', array('id' => $calendar->courseid, 'time' => $calendar->time)), array('class' => 'controls'));
 469  
 470          $table = new html_table();
 471          $table->attributes = array('class'=>'calendarmonth calendartable');
 472          $table->summary = get_string('calendarheading', 'calendar', userdate($calendar->time, get_string('strftimemonthyear')));
 473          $table->data = array();
 474  
 475          // Get the day names as the header.
 476          $header = array();
 477          for($i = $display->minwday; $i <= $display->maxwday; ++$i) {
 478              $header[] = $daynames[$i % $numberofdaysinweek]['shortname'];
 479          }
 480          $table->head = $header;
 481  
 482          // For the table display. $week is the row; $dayweek is the column.
 483          $week = 1;
 484          $dayweek = $startwday;
 485  
 486          $row = new html_table_row(array());
 487  
 488          // Paddding (the first week may have blank days in the beginning)
 489          for($i = $display->minwday; $i < $startwday; ++$i) {
 490              $cell = new html_table_cell('&nbsp;');
 491              $cell->attributes = array('class'=>'nottoday dayblank');
 492              $row->cells[] = $cell;
 493          }
 494  
 495          // Now display all the calendar
 496          $weekend = CALENDAR_DEFAULT_WEEKEND;
 497          if (isset($CFG->calendar_weekend)) {
 498              $weekend = intval($CFG->calendar_weekend);
 499          }
 500  
 501          $daytime = strtotime('-1 day', $display->tstart);
 502          for ($day = 1; $day <= $display->maxdays; ++$day, ++$dayweek) {
 503              $daytime = strtotime('+1 day', $daytime);
 504              if($dayweek > $display->maxwday) {
 505                  // We need to change week (table row)
 506                  $table->data[] = $row;
 507                  $row = new html_table_row(array());
 508                  $dayweek = $display->minwday;
 509                  ++$week;
 510              }
 511  
 512              // Reset vars
 513              $cell = new html_table_cell();
 514              $dayhref = calendar_get_link_href(new moodle_url(CALENDAR_URL.'view.php', array('view' => 'day', 'course' => $calendar->courseid)), 0, 0, 0, $daytime);
 515  
 516              $cellclasses = array();
 517  
 518              if ($weekend & (1 << ($dayweek % $numberofdaysinweek))) {
 519                  // Weekend. This is true no matter what the exact range is.
 520                  $cellclasses[] = 'weekend';
 521              }
 522  
 523              // Special visual fx if an event is defined
 524              if (isset($eventsbyday[$day])) {
 525                  if(count($eventsbyday[$day]) == 1) {
 526                      $title = get_string('oneevent', 'calendar');
 527                  } else {
 528                      $title = get_string('manyevents', 'calendar', count($eventsbyday[$day]));
 529                  }
 530                  $cell->text = html_writer::tag('div', html_writer::link($dayhref, $day, array('title'=>$title)), array('class'=>'day'));
 531              } else {
 532                  $cell->text = html_writer::tag('div', $day, array('class'=>'day'));
 533              }
 534  
 535              // Special visual fx if an event spans many days
 536              $durationclass = false;
 537              if (isset($typesbyday[$day]['durationglobal'])) {
 538                  $durationclass = 'duration_global';
 539              } else if (isset($typesbyday[$day]['durationcourse'])) {
 540                  $durationclass = 'duration_course';
 541              } else if (isset($typesbyday[$day]['durationgroup'])) {
 542                  $durationclass = 'duration_group';
 543              } else if (isset($typesbyday[$day]['durationuser'])) {
 544                  $durationclass = 'duration_user';
 545              }
 546              if ($durationclass) {
 547                  $cellclasses[] = 'duration';
 548                  $cellclasses[] = $durationclass;
 549              }
 550  
 551              // Special visual fx for today
 552              if ($display->thismonth && $day == $date['mday']) {
 553                  $cellclasses[] = 'day today';
 554              } else {
 555                  $cellclasses[] = 'day nottoday';
 556              }
 557              $cell->attributes = array('class'=>join(' ',$cellclasses));
 558  
 559              if (isset($eventsbyday[$day])) {
 560                  $cell->text .= html_writer::start_tag('ul', array('class'=>'events-new'));
 561                  foreach($eventsbyday[$day] as $eventindex) {
 562                      // If event has a class set then add it to the event <li> tag
 563                      $attributes = array();
 564                      if (!empty($events[$eventindex]->class)) {
 565                          $attributes['class'] = $events[$eventindex]->class;
 566                      }
 567                      $dayhref->set_anchor('event_'.$events[$eventindex]->id);
 568                      $link = html_writer::link($dayhref, format_string($events[$eventindex]->name, true));
 569                      $cell->text .= html_writer::tag('li', $link, $attributes);
 570                  }
 571                  $cell->text .= html_writer::end_tag('ul');
 572              }
 573              if (isset($durationbyday[$day])) {
 574                  $cell->text .= html_writer::start_tag('ul', array('class'=>'events-underway'));
 575                  foreach($durationbyday[$day] as $eventindex) {
 576                      $cell->text .= html_writer::tag('li', '['.format_string($events[$eventindex]->name,true).']', array('class'=>'events-underway'));
 577                  }
 578                  $cell->text .= html_writer::end_tag('ul');
 579              }
 580              $row->cells[] = $cell;
 581          }
 582  
 583          // Paddding (the last week may have blank days at the end)
 584          for($i = $dayweek; $i <= $display->maxwday; ++$i) {
 585              $cell = new html_table_cell('&nbsp;');
 586              $cell->attributes = array('class'=>'nottoday dayblank');
 587              $row->cells[] = $cell;
 588          }
 589          $table->data[] = $row;
 590          $output .= html_writer::table($table);
 591  
 592          return $output;
 593      }
 594  
 595      /**
 596       * Displays upcoming events
 597       *
 598       * @param calendar_information $calendar
 599       * @param int $futuredays
 600       * @param int $maxevents
 601       * @return string
 602       */
 603      public function show_upcoming_events(calendar_information $calendar, $futuredays, $maxevents, moodle_url $returnurl = null) {
 604  
 605          if ($returnurl === null) {
 606              $returnurl = $this->page->url;
 607          }
 608  
 609          $events = calendar_get_upcoming($calendar->courses, $calendar->groups, $calendar->users, $futuredays, $maxevents);
 610  
 611          $output  = html_writer::start_tag('div', array('class'=>'header'));
 612          $output .= $this->course_filter_selector($returnurl, get_string('upcomingeventsfor', 'calendar'));
 613          if (calendar_user_can_add_event($calendar->course)) {
 614              $output .= $this->add_event_button($calendar->course->id);
 615          }
 616          $output .= html_writer::end_tag('div');
 617  
 618          if ($events) {
 619              $output .= html_writer::start_tag('div', array('class' => 'eventlist'));
 620              foreach ($events as $event) {
 621                  // Convert to calendar_event object so that we transform description
 622                  // accordingly
 623                  $event = new calendar_event($event);
 624                  $event->calendarcourseid = $calendar->courseid;
 625                  $output .= $this->event($event);
 626              }
 627              $output .= html_writer::end_tag('div');
 628          } else {
 629              $output .= $this->output->heading(get_string('noupcomingevents', 'calendar'));
 630          }
 631  
 632          return $output;
 633      }
 634  
 635      /**
 636       * Displays a course filter selector
 637       *
 638       * @param moodle_url $returnurl The URL that the user should be taken too upon selecting a course.
 639       * @param string $label The label to use for the course select.
 640       * @return string
 641       */
 642      protected function course_filter_selector(moodle_url $returnurl, $label=null) {
 643          global $USER, $SESSION, $CFG;
 644  
 645          if (!isloggedin() or isguestuser()) {
 646              return '';
 647          }
 648  
 649          if (has_capability('moodle/calendar:manageentries', context_system::instance()) && !empty($CFG->calendar_adminseesall)) {
 650              $courses = get_courses('all', 'c.shortname','c.id,c.shortname');
 651          } else {
 652              $courses = enrol_get_my_courses();
 653          }
 654  
 655          unset($courses[SITEID]);
 656  
 657          $courseoptions = array();
 658          $courseoptions[SITEID] = get_string('fulllistofcourses');
 659          foreach ($courses as $course) {
 660              $coursecontext = context_course::instance($course->id);
 661              $courseoptions[$course->id] = format_string($course->shortname, true, array('context' => $coursecontext));
 662          }
 663  
 664          if ($this->page->course->id !== SITEID) {
 665              $selected = $this->page->course->id;
 666          } else {
 667              $selected = '';
 668          }
 669          $courseurl = new moodle_url($returnurl);
 670          $courseurl->remove_params('course');
 671          $select = new single_select($courseurl, 'course', $courseoptions, $selected, null);
 672          $select->class = 'cal_courses_flt';
 673          if ($label !== null) {
 674              $select->set_label($label);
 675          } else {
 676              $select->set_label(get_string('listofcourses'), array('class' => 'accesshide'));
 677          }
 678          return $this->output->render($select);
 679      }
 680  
 681      /**
 682       * Renders a table containing information about calendar subscriptions.
 683       *
 684       * @param int $courseid
 685       * @param array $subscriptions
 686       * @param string $importresults
 687       * @return string
 688       */
 689      public function subscription_details($courseid, $subscriptions, $importresults = '') {
 690          $table = new html_table();
 691          $table->head  = array(
 692              get_string('colcalendar', 'calendar'),
 693              get_string('collastupdated', 'calendar'),
 694              get_string('eventkind', 'calendar'),
 695              get_string('colpoll', 'calendar'),
 696              get_string('colactions', 'calendar')
 697          );
 698          $table->align = array('left', 'left', 'left', 'center');
 699          $table->width = '100%';
 700          $table->data  = array();
 701  
 702          if (empty($subscriptions)) {
 703              $cell = new html_table_cell(get_string('nocalendarsubscriptions', 'calendar'));
 704              $cell->colspan = 4;
 705              $table->data[] = new html_table_row(array($cell));
 706          }
 707          $strnever = new lang_string('never', 'calendar');
 708          foreach ($subscriptions as $sub) {
 709              $label = $sub->name;
 710              if (!empty($sub->url)) {
 711                  $label = html_writer::link($sub->url, $label);
 712              }
 713              if (empty($sub->lastupdated)) {
 714                  $lastupdated = $strnever->out();
 715              } else {
 716                  $lastupdated = userdate($sub->lastupdated, get_string('strftimedatetimeshort', 'langconfig'));
 717              }
 718  
 719              $cell = new html_table_cell($this->subscription_action_form($sub, $courseid));
 720              $cell->colspan = 2;
 721              $type = $sub->eventtype . 'events';
 722  
 723              $table->data[] = new html_table_row(array(
 724                  new html_table_cell($label),
 725                  new html_table_cell($lastupdated),
 726                  new html_table_cell(get_string($type, 'calendar')),
 727                  $cell
 728              ));
 729          }
 730  
 731          $out  = $this->output->box_start('generalbox calendarsubs');
 732  
 733          $out .= $importresults;
 734          $out .= html_writer::table($table);
 735          $out .= $this->output->box_end();
 736          return $out;
 737      }
 738  
 739      /**
 740       * Creates a form to perform actions on a given subscription.
 741       *
 742       * @param stdClass $subscription
 743       * @param int $courseid
 744       * @return string
 745       */
 746      protected function subscription_action_form($subscription, $courseid) {
 747          // Assemble form for the subscription row.
 748          $html = html_writer::start_tag('form', array('action' => new moodle_url('/calendar/managesubscriptions.php'), 'method' => 'post'));
 749          if (empty($subscription->url)) {
 750              // Don't update an iCal file, which has no URL.
 751              $html .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'pollinterval', 'value' => '0'));
 752          } else {
 753              // Assemble pollinterval control.
 754              $html .= html_writer::start_tag('div', array('style' => 'float:left;'));
 755              $html .= html_writer::start_tag('select', array('name' => 'pollinterval'));
 756              foreach (calendar_get_pollinterval_choices() as $k => $v) {
 757                  $attributes = array();
 758                  if ($k == $subscription->pollinterval) {
 759                      $attributes['selected'] = 'selected';
 760                  }
 761                  $attributes['value'] = $k;
 762                  $html .= html_writer::tag('option', $v, $attributes);
 763              }
 764              $html .= html_writer::end_tag('select');
 765              $html .= html_writer::end_tag('div');
 766          }
 767          $html .= html_writer::start_tag('div', array('style' => 'float:right;'));
 768          $html .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'sesskey', 'value' => sesskey()));
 769          $html .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'course', 'value' => $courseid));
 770          $html .= html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'id', 'value' => $subscription->id));
 771          if (!empty($subscription->url)) {
 772              $html .= html_writer::tag('button', get_string('update'), array('type'  => 'submit', 'name' => 'action',
 773                                                                              'value' => CALENDAR_SUBSCRIPTION_UPDATE));
 774          }
 775          $html .= html_writer::tag('button', get_string('remove'), array('type'  => 'submit', 'name' => 'action',
 776                                                                          'value' => CALENDAR_SUBSCRIPTION_REMOVE));
 777          $html .= html_writer::end_tag('div');
 778          $html .= html_writer::end_tag('form');
 779          return $html;
 780      }
 781  }