engelsystem/includes/pages/user_shifts.php

<?php
function shifts_title() {
  return _("All Shifts");
}

function user_shifts() {
  global $user, $privileges;
  
  // Löschen einzelner Schicht-Einträge (Also Belegung einer Schicht von Engeln) durch Admins
  if (isset($_REQUEST['entry_id']) && in_array('user_shifts_admin', $privileges)) {
    if (isset($_REQUEST['entry_id']) && test_request_int('entry_id'))
      $entry_id = $_REQUEST['entry_id'];
    else
      redirect(page_link_to('user_shifts'));
    
    $shift_entry_source = sql_select("SELECT `User`.`Nick`, `ShiftEntry`.`Comment`, `ShiftEntry`.`UID`, `Shifts`.*, `Room`.`Name`, `AngelTypes`.`name` as `angel_type` FROM `ShiftEntry` JOIN `User` ON (`User`.`UID`=`ShiftEntry`.`UID`) JOIN `AngelTypes` ON (`ShiftEntry`.`TID` = `AngelTypes`.`id`) JOIN `Shifts` ON (`ShiftEntry`.`SID` = `Shifts`.`SID`) JOIN `Room` ON (`Shifts`.`RID` = `Room`.`RID`) WHERE `ShiftEntry`.`id`=" . sql_escape($entry_id) . " LIMIT 1");
    if (count($shift_entry_source) > 0) {
      $shift_entry_source = $shift_entry_source[0];
      sql_query("DELETE FROM `ShiftEntry` WHERE `id`=" . sql_escape($entry_id) . " LIMIT 1");
      
      engelsystem_log("Deleted " . User_Nick_render($shift_entry_source) . "'s shift: " . $shift_entry_source['name'] . " at " . $shift_entry_source['Name'] . " from " . date("y-m-d H:i", $shift_entry_source['start']) . " to " . date("y-m-d H:i", $shift_entry_source['end']) . " as " . $shift_entry_source['angel_type']);
      success(_("Shift entry deleted."));
    } else
      error(_("Entry not found."));
    redirect(page_link_to('user_shifts'));
  }  // Schicht bearbeiten
  elseif (isset($_REQUEST['edit_shift']) && in_array('admin_shifts', $privileges)) {
    $msg = "";
    $ok = true;
    
    if (isset($_REQUEST['edit_shift']) && test_request_int('edit_shift'))
      $shift_id = $_REQUEST['edit_shift'];
    else
      redirect(page_link_to('user_shifts'));
      
      /*
     * if (sql_num_query("SELECT * FROM `ShiftEntry` WHERE `SID`=" . sql_escape($shift_id) . " LIMIT 1") > 0) { error("Du kannst nur Schichten bearbeiten, bei denen niemand eingetragen ist."); redirect(page_link_to('user_shift')); }
     */
    
    $shift = sql_select("SELECT * FROM `Shifts` JOIN `Room` ON (`Shifts`.`RID` = `Room`.`RID`) WHERE `SID`=" . sql_escape($shift_id) . " LIMIT 1");
    if (count($shift) == 0)
      redirect(page_link_to('user_shifts'));
    $shift = $shift[0];
    
    // Locations laden
    $rooms = sql_select("SELECT * FROM `Room` WHERE `show`='Y' ORDER BY `Name`");
    $room_array = array();
    foreach ($rooms as $room)
      $room_array[$room['RID']] = $room['Name'];
      
      // Engeltypen laden
    $types = sql_select("SELECT * FROM `AngelTypes` ORDER BY `name`");
    $angel_types = array();
    $needed_angel_types = array();
    foreach ($types as $type) {
      $angel_types[$type['id']] = $type;
      $needed_angel_types[$type['id']] = 0;
    }
    
    // Benötigte Engeltypen vom Raum
    $needed_angel_types_source = sql_select("SELECT `AngelTypes`.*, `NeededAngelTypes`.`count` FROM `AngelTypes` LEFT JOIN `NeededAngelTypes` ON (`NeededAngelTypes`.`angel_type_id` = `AngelTypes`.`id` AND `NeededAngelTypes`.`room_id`=" . sql_escape($shift['RID']) . ") ORDER BY `AngelTypes`.`name`");
    foreach ($needed_angel_types_source as $type) {
      if ($type['count'] != "")
        $needed_angel_types[$type['id']] = $type['count'];
    }
    
    // Benötigte Engeltypen von der Schicht
    $needed_angel_types_source = sql_select("SELECT `AngelTypes`.*, `NeededAngelTypes`.`count` FROM `AngelTypes` LEFT JOIN `NeededAngelTypes` ON (`NeededAngelTypes`.`angel_type_id` = `AngelTypes`.`id` AND `NeededAngelTypes`.`shift_id`=" . sql_escape($shift_id) . ") ORDER BY `AngelTypes`.`name`");
    foreach ($needed_angel_types_source as $type) {
      if ($type['count'] != "")
        $needed_angel_types[$type['id']] = $type['count'];
    }
    
    $name = $shift['name'];
    $rid = $shift['RID'];
    $start = $shift['start'];
    $end = $shift['end'];
    
    if (isset($_REQUEST['submit'])) {
      // Name/Bezeichnung der Schicht, darf leer sein
      $name = strip_request_item('name');
      
      // Auswahl der sichtbaren Locations für die Schichten
      if (isset($_REQUEST['rid']) && preg_match("/^[0-9]+$/", $_REQUEST['rid']) && isset($room_array[$_REQUEST['rid']]))
        $rid = $_REQUEST['rid'];
      else {
        $ok = false;
        $rid = $rooms[0]['RID'];
        $msg .= error(_("Please select a room."), true);
      }
      
      if (isset($_REQUEST['start']) && $tmp = DateTime::createFromFormat("Y-m-d H:i", trim($_REQUEST['start'])))
        $start = $tmp->getTimestamp();
      else {
        $ok = false;
        $msg .= error(_("Please enter a valid starting time for the shifts."), true);
      }
      
      if (isset($_REQUEST['end']) && $tmp = DateTime::createFromFormat("Y-m-d H:i", trim($_REQUEST['end'])))
        $end = $tmp->getTimestamp();
      else {
        $ok = false;
        $msg .= error(_("Please enter a valid ending time for the shifts."), true);
      }
      
      if ($start >= $end) {
        $ok = false;
        $msg .= error(_("The ending time has to be after the starting time."), true);
      }
      
      foreach ($needed_angel_types_source as $type) {
        if (isset($_REQUEST['type_' . $type['id']]) && preg_match("/^[0-9]+$/", trim($_REQUEST['type_' . $type['id']]))) {
          $needed_angel_types[$type['id']] = trim($_REQUEST['type_' . $type['id']]);
        } else {
          $ok = false;
          $msg .= error(sprintf(_("Please check your input for needed angels of type %s."), $type['name']), true);
        }
      }
      
      if ($ok) {
        sql_query("UPDATE `Shifts` SET `start`=" . sql_escape($start) . ", `end`=" . sql_escape($end) . ", `RID`=" . sql_escape($rid) . ", `name`='" . sql_escape($name) . "' WHERE `SID`=" . sql_escape($shift_id) . " LIMIT 1");
        sql_query("DELETE FROM `NeededAngelTypes` WHERE `shift_id`=" . sql_escape($shift_id));
        $needed_angel_types_info = array();
        foreach ($needed_angel_types as $type_id => $count) {
          sql_query("INSERT INTO `NeededAngelTypes` SET `shift_id`=" . sql_escape($shift_id) . ", `angel_type_id`=" . sql_escape($type_id) . ", `count`=" . sql_escape($count));
          $needed_angel_types_info[] = $angel_types[$type_id]['name'] . ": " . $count;
        }
        
        engelsystem_log("Updated shift '" . $name . "' from " . date("y-m-d H:i", $start) . " to " . date("y-m-d H:i", $end) . " with angel types " . join(", ", $needed_angel_types_info));
        success(_("Shift updated."));
        redirect(page_link_to('user_shifts'));
      }
    }
    
    $room_select = html_select_key('rid', 'rid', $room_array, $rid);
    
    $angel_types = "";
    foreach ($types as $type) {
      $angel_types .= template_render('../templates/admin_shifts_angel_types.html', array(
          'id' => $type['id'],
          'type' => $type['name'],
          'value' => $needed_angel_types[$type['id']] 
      ));
    }
    
    return page(array(
    	msg(),
        '<noscript>' . info(_("This page is much more comfortable with javascript."), true) . '</noscript>',
        form(array(
        	form_text('name', _("Name/Description:"), $name),
            form_select('rid', _("Room:"), $room_array, $rid),
            form_text('start', _("Start:"), date("Y-m-d H:i", $start)),
            form_text('end', _("End:"), date("Y-m-d H:i", $end)),
            '<h2>' . _("Needed angels") . '</h2>',
            $angel_types,
            form_submit('submit', _("Save"))
        ))
    ));
  }  // Schicht komplett löschen (nur für admins/user mit user_shifts_admin privileg)
  elseif (isset($_REQUEST['delete_shift']) && in_array('user_shifts_admin', $privileges)) {
    if (isset($_REQUEST['delete_shift']) && preg_match("/^[0-9]*$/", $_REQUEST['delete_shift']))
      $shift_id = $_REQUEST['delete_shift'];
    else
      redirect(page_link_to('user_shifts'));
    
    $shift = sql_select("SELECT * FROM `Shifts` JOIN `Room` ON (`Shifts`.`RID` = `Room`.`RID`) WHERE `SID`=" . sql_escape($shift_id) . " LIMIT 1");
    if (count($shift) == 0)
      redirect(page_link_to('user_shifts'));
    $shift = $shift[0];
    
    // Schicht löschen bestätigt
    if (isset($_REQUEST['delete'])) {
      sql_query("DELETE FROM `ShiftEntry` WHERE `SID`=" . sql_escape($shift_id));
      sql_query("DELETE FROM `NeededAngelTypes` WHERE `shift_id`=" . sql_escape($shift_id));
      sql_query("DELETE FROM `Shifts` WHERE `SID`=" . sql_escape($shift_id) . " LIMIT 1");
      
      engelsystem_log("Deleted shift " . $shift['name'] . " from " . date("y-m-d H:i", $shift['start']) . " to " . date("y-m-d H:i", $shift['end']));
      success(_("Shift deleted."));
      redirect(page_link_to('user_shifts'));
    }
    
    return page(array(
    	error(sprintf(_("Do you want to delete the shift %s from %s to %s?"), $shift['name'], date("Y-m-d H:i", $shift['start']), date("H:i", $shift['end'])), true),
        '<a class="button" href="?p=user_shifts&delete_shift=' . $shift_id . '&delete">' . _("delete") . '</a>'
    ));
  } elseif (isset($_REQUEST['shift_id'])) {
    if (isset($_REQUEST['shift_id']) && preg_match("/^[0-9]*$/", $_REQUEST['shift_id']))
      $shift_id = $_REQUEST['shift_id'];
    else
      redirect(page_link_to('user_shifts'));
    
    $shift = sql_select("SELECT * FROM `Shifts` JOIN `Room` ON (`Shifts`.`RID` = `Room`.`RID`) WHERE `SID`=" . sql_escape($shift_id) . " LIMIT 1");
    if (count($shift) == 0)
      redirect(page_link_to('user_shifts'));
    $shift = $shift[0];
    
    if (isset($_REQUEST['type_id']) && preg_match("/^[0-9]*$/", $_REQUEST['type_id']))
      $type_id = $_REQUEST['type_id'];
    else
      redirect(page_link_to('user_shifts'));
      
      // Schicht läuft schon, Eintragen für Engel nicht mehr möglich
    if (! in_array('user_shifts_admin', $privileges) && time() > $shift['start']) {
      error(_("This shift is running now or ended already. Please contact a dispatcher to join the shift."));
      redirect(page_link_to('user_shifts'));
    }
    
    // Another shift the user is signed up for collides with this one
    if (! in_array('user_shifts_admin', $privileges) && sql_num_query("SELECT `Shifts`.`SID` FROM `Shifts` INNER JOIN `ShiftEntry` ON (`Shifts`.`SID` = `ShiftEntry`.`SID` AND `ShiftEntry`.`UID` = " . sql_escape($user['UID']) . ") WHERE `start` < '" . sql_escape($shift['end']) . "' AND `end` > '" . sql_escape($shift['start']) . "'") > 0) {
      error(_("You already subscribed to shift in the same timeslot. Please contact a dispatcher to join the shift."));
      redirect(page_link_to('user_shifts'));
    }
    
    if (in_array('user_shifts_admin', $privileges))
      $type = sql_select("SELECT * FROM `AngelTypes` WHERE `id`=" . sql_escape($type_id) . " LIMIT 1");
    else
      $type = sql_select("SELECT * FROM `UserAngelTypes` JOIN `AngelTypes` ON (`UserAngelTypes`.`angeltype_id` = `AngelTypes`.`id`) WHERE `AngelTypes`.`id` = " . sql_escape($type_id) . " AND (`AngelTypes`.`restricted` = 0 OR (`UserAngelTypes`.`user_id` = " . sql_escape($user['UID']) . " AND NOT `UserAngelTypes`.`confirm_user_id` IS NULL)) LIMIT 1");
    
    if (count($type) == 0)
      redirect(page_link_to('user_shifts'));
    $type = $type[0];
    
    if (isset($_REQUEST['submit'])) {
      $selected_type_id = $type_id;
      if (in_array('user_shifts_admin', $privileges)) {
        if (isset($_REQUEST['user_id']) && preg_match("/^[0-9]*$/", $_REQUEST['user_id']))
          $user_id = $_REQUEST['user_id'];
        else
          $user_id = $user['UID'];
        
        if (sql_num_query("SELECT * FROM `User` WHERE `UID`=" . sql_escape($user_id) . " LIMIT 1") == 0)
          redirect(page_link_to('user_shifts'));
        
        if (isset($_REQUEST['angeltype_id']) && test_request_int('angeltype_id') && sql_num_query("SELECT * FROM `AngelTypes` WHERE `id`=" . sql_escape($_REQUEST['angeltype_id']) . " LIMIT 1") > 0)
          $selected_type_id = $_REQUEST['angeltype_id'];
      } else
        $user_id = $user['UID'];
      
      if (sql_num_query("SELECT * FROM `ShiftEntry` WHERE `SID`='" . sql_escape($shift['SID']) . "' AND `UID` = '" . sql_escape($user_id) . "'"))
        return error("This angel does already have an entry for this shift.", true);
      
      $comment = strip_request_item_nl('comment');
      sql_query("INSERT INTO `ShiftEntry` SET `Comment`='" . sql_escape($comment) . "', `UID`=" . sql_escape($user_id) . ", `TID`=" . sql_escape($selected_type_id) . ", `SID`=" . sql_escape($shift_id));
      if ($type['restricted'] == 0 && sql_num_query("SELECT * FROM `UserAngelTypes` INNER JOIN `AngelTypes` ON `AngelTypes`.`id` = `UserAngelTypes`.`angeltype_id` WHERE `angeltype_id` = '" . sql_escape($selected_type_id) . "' AND `user_id` = '" . sql_escape($user_id) . "' ") == 0)
        sql_query("INSERT INTO `UserAngelTypes` (`user_id`, `angeltype_id`) VALUES ('" . sql_escape($user_id) . "', '" . sql_escape($selected_type_id) . "')");
      
      $user_source = User($user_id);
      engelsystem_log("User " . User_Nick_render($user_source) . " signed up for shift " . $shift['name'] . " from " . date("y-m-d H:i", $shift['start']) . " to " . date("y-m-d H:i", $shift['end']));
      success(_("You are subscribed. Thank you!") . ' <a href="' . page_link_to('user_myshifts') . '">' . _("My shifts") . ' &raquo;</a>');
      redirect(page_link_to('user_shifts'));
    }
    
    if (in_array('user_shifts_admin', $privileges)) {
      $users = sql_select("SELECT * FROM `User` ORDER BY `Nick`");
      $users_select = array();
      foreach ($users as $usr)
        $users_select[$usr['UID']] = $usr['Nick'];
      $user_text = html_select_key('user_id', 'user_id', $users_select, $user['UID']);
      
      $angeltypes_source = sql_select("SELECT * FROM `AngelTypes` ORDER BY `name`");
      $angeltypes = array();
      foreach ($angeltypes_source as $angeltype)
        $angeltypes[$angeltype['id']] = $angeltype['name'];
      $angeltyppe_select = html_select_key('angeltype_id', 'angeltype_id', $angeltypes, $type['id']);
    } else {
      $user_text = User_Nick_render($user);
      $angeltyppe_select = $type['name'];
    }
    
    return ShiftEntry_edit_view(date("Y-m-d H:i", $shift['start']) . ' &ndash; ' . date('Y-m-d H:i', $shift['end']) . ' (' . shift_length($shift) . ')', $shift['name'], $shift['Name'], $user_text, $angeltyppe_select, "");
  } else {
    return view_user_shifts();
  }
}

function view_user_shifts() {
  global $user, $privileges;
  global $ical_shifts;
  
  $ical_shifts = array();
  $days = sql_select_single_col("SELECT DISTINCT DATE(FROM_UNIXTIME(`start`)) AS `id`, DATE(FROM_UNIXTIME(`start`)) AS `name` FROM `Shifts` ORDER BY `start`");
  $rooms = sql_select("SELECT `RID` AS `id`, `Name` AS `name` FROM `Room` WHERE `show`='Y' ORDER BY `Name`");
  
  if (in_array('user_shifts_admin', $privileges))
    $types = sql_select("SELECT `id`, `name` FROM `AngelTypes` ORDER BY `AngelTypes`.`name`");
  else
    $types = sql_select("SELECT `AngelTypes`.`id`, `AngelTypes`.`name`, (`AngelTypes`.`restricted`=0 OR (NOT `UserAngelTypes`.`confirm_user_id` IS NULL OR `UserAngelTypes`.`id` IS NULL)) as `enabled` FROM `AngelTypes` LEFT JOIN `UserAngelTypes` ON (`UserAngelTypes`.`angeltype_id`=`AngelTypes`.`id` AND `UserAngelTypes`.`user_id`=" . sql_escape($user['UID']) . ") ORDER BY `AngelTypes`.`name`");
  if (empty($types))
    $types = sql_select("SELECT `id`, `name` FROM `AngelTypes` WHERE `restricted` = 0");
  $filled = array(
      array(
          'id' => '1',
          'name' => _('occupied') 
      ),
      array(
          'id' => '0',
          'name' => _('free') 
      ) 
  );
  
  if (! isset($_SESSION['user_shifts']))
    $_SESSION['user_shifts'] = array();
  
  if (! isset($_SESSION['user_shifts']['filled'])) {
    $_SESSION['user_shifts']['filled'] = array(
        0 
    );
  }
  
  foreach (array(
      'rooms',
      'types',
      'filled' 
  ) as $key) {
    if (isset($_REQUEST[$key])) {
      $filtered = array_filter($_REQUEST[$key], 'is_numeric');
      if (! empty($filtered))
        $_SESSION['user_shifts'][$key] = $filtered;
      unset($filtered);
    }
    if (! isset($_SESSION['user_shifts'][$key]))
      $_SESSION['user_shifts'][$key] = array_map('get_ids_from_array', $$key);
  }
  
  if (isset($_REQUEST['rooms'])) {
    if (isset($_REQUEST['new_style']))
      $_SESSION['user_shifts']['new_style'] = true;
    else
      $_SESSION['user_shifts']['new_style'] = false;
  }
  if (! isset($_SESSION['user_shifts']['new_style']))
    $_SESSION['user_shifts']['new_style'] = true;
  foreach (array(
      'start',
      'end' 
  ) as $key) {
    if (isset($_REQUEST[$key . '_day']) && in_array($_REQUEST[$key . '_day'], $days))
      $_SESSION['user_shifts'][$key . '_day'] = $_REQUEST[$key . '_day'];
    if (isset($_REQUEST[$key . '_time']) && preg_match('#^\d{1,2}:\d\d$#', $_REQUEST[$key . '_time']))
      $_SESSION['user_shifts'][$key . '_time'] = $_REQUEST[$key . '_time'];
    if (! isset($_SESSION['user_shifts'][$key . '_day'])) {
      $time = date('Y-m-d', time() + ($key == 'end' ? 24 * 60 * 60 : 0));
      $_SESSION['user_shifts'][$key . '_day'] = in_array($time, $days) ? $time : ($key == 'end' ? max($days) : min($days));
    }
    if (! isset($_SESSION['user_shifts'][$key . '_time']))
      $_SESSION['user_shifts'][$key . '_time'] = date('H:i');
  }
  if ($_SESSION['user_shifts']['start_day'] > $_SESSION['user_shifts']['end_day'])
    $_SESSION['user_shifts']['end_day'] = $_SESSION['user_shifts']['start_day'];
  if ($_SESSION['user_shifts']['start_day'] == $_SESSION['user_shifts']['end_day'] && $_SESSION['user_shifts']['start_time'] >= $_SESSION['user_shifts']['end_time'])
    $_SESSION['user_shifts']['end_time'] = '23:59';
  
  if(isset($_SESSION['user_shifts']['start_day'])) {
    $starttime = DateTime::createFromFormat("Y-m-d H:i", $_SESSION['user_shifts']['start_day'] . $_SESSION['user_shifts']['start_time']);
    $starttime = $starttime->getTimestamp();
  } else
    $starttime = now();
  
  if(isset($_SESSION['user_shifts']['end_day'])) {
    $endtime = DateTime::createFromFormat("Y-m-d H:i", $_SESSION['user_shifts']['end_day'] . $_SESSION['user_shifts']['end_time']);
    $endtime = $endtime->getTimestamp();
  } else
    $endtime = now() + 24*60*60;
  
  if (! isset($_SESSION['user_shifts']['rooms']) || count($_SESSION['user_shifts']['rooms']) == 0)
    $_SESSION['user_shifts']['rooms'] = array(
        0 
    );
  
  $SQL = "SELECT DISTINCT `Shifts`.*, `Room`.`Name` as `room_name`, nat2.`special_needs` > 0 AS 'has_special_needs'
  FROM `Shifts`
  INNER JOIN `Room` USING (`RID`)
  LEFT JOIN (SELECT COUNT(*) AS special_needs , nat3.`shift_id` FROM `NeededAngelTypes` AS nat3 WHERE `shift_id` IS NOT NULL GROUP BY nat3.`shift_id`) AS nat2 ON nat2.`shift_id` = `Shifts`.`SID`
  INNER JOIN `NeededAngelTypes` AS nat ON nat.`count` != 0 AND nat.`angel_type_id` IN (" . implode(',', $_SESSION['user_shifts']['types']) . ") AND ((nat2.`special_needs` > 0 AND nat.`shift_id` = `Shifts`.`SID`) OR ((nat2.`special_needs` = 0 OR nat2.`special_needs` IS NULL) AND nat.`room_id` = `RID`))
  LEFT JOIN (SELECT se.`SID`, se.`TID`, COUNT(*) as count FROM `ShiftEntry` AS se GROUP BY se.`SID`, se.`TID`) AS entries ON entries.`SID` = `Shifts`.`SID` AND entries.`TID` = nat.`angel_type_id`
  WHERE `Shifts`.`RID` IN (" . implode(',', $_SESSION['user_shifts']['rooms']) . ")
  AND `start` BETWEEN " . $starttime . " AND " . $endtime;
  if (count($_SESSION['user_shifts']['filled']) == 1) {
    if ($_SESSION['user_shifts']['filled'][0] == 0)
      $SQL .= "
      AND (nat.`count` > entries.`count` OR entries.`count` IS NULL) ";
    elseif ($_SESSION['user_shifts']['filled'][0] == 1)
      $SQL .= "
    AND (nat.`count` <= entries.`count`) ";
  }
  $SQL .= "
  ORDER BY `start`";
  $shifts = sql_select($SQL);
  $ownshifts_source = sql_select("SELECT `Shifts`.* FROM `Shifts` INNER JOIN `ShiftEntry` ON (`Shifts`.`SID` = `ShiftEntry`.`SID` AND `ShiftEntry`.`UID` = '" . sql_escape($user['UID']) . "')
      WHERE `Shifts`.`RID` IN (" . implode(',', $_SESSION['user_shifts']['rooms']) . ")
      AND `start` BETWEEN " . $starttime . " AND " . $endtime);
  $ownshifts = array();
  foreach ($ownshifts_source as $ownshift)
    $ownshifts[$ownshift['SID']] = $ownshift;
  unset($ownshifts_source);
  
  $shifts_table = "";
  // qqqq
  /*
   * [0] => Array ( [SID] => 1 [start] => 1355958000 [end] => 1355961600 [RID] => 1 [name] => [URL] => [PSID] => [room_name] => test1 [has_special_needs] => 1 [is_full] => 0 )
   */
  if ($_SESSION['user_shifts']['new_style']) {
    $first = 15 * 60 * floor($starttime / (15 * 60));
    $maxshow = ceil(($endtime - $first) / (60 * 15));
    $block = array();
    $todo = array();
    $myrooms = $rooms;
    
    // delete un-selected rooms from array
    foreach ($myrooms as $k => $v) {
      if (array_search($v["id"], $_SESSION['user_shifts']['rooms']) === FALSE)
        unset($myrooms[$k]);
        // initialize $block array
      $block[$v["id"]] = array_fill(0, $maxshow, 0);
    }
    
    // calculate number of parallel shifts in each timeslot for each room
    foreach ($shifts as $k => $shift) {
      $rid = $shift["RID"];
      $blocks = ($shift["end"] - $shift["start"]) / (15 * 60);
      $firstblock = floor(($shift["start"] - $first) / (15 * 60));
      for ($i = $firstblock; $i < $blocks + $firstblock && $i < $maxshow; $i ++)
        $block[$rid][$i] ++;
      $shifts[$k]['own'] = in_array($shift['SID'], array_keys($ownshifts));
    }
    
    $shifts_table = '<table id="shifts" class="scrollable"><thead><tr><th>-</th>';
    foreach ($myrooms as $key => $room) {
      $rid = $room["id"];
      if (array_sum($block[$rid]) == 0) {
        // do not display columns without entries
        unset($block[$rid]);
        unset($myrooms[$key]);
        continue;
      }
      $colspan = call_user_func_array('max', $block[$rid]);
      if ($colspan == 0)
        $colspan = 1;
      $todo[$rid] = array_fill(0, $maxshow, $colspan);
      $shifts_table .= "<th" . (($colspan > 1) ? ' colspan="' . $colspan . '"' : '') . ">${room['name']}</th>\n";
    }
    unset($block, $blocks, $firstblock, $colspan, $key, $room);
    
    $shifts_table .= "</tr></thead><tbody>";
    for ($i = 0; $i < $maxshow; $i ++) {
      $thistime = $first + ($i * 15 * 60);
      $shifts_table .= "<tr><th>";
      if ($thistime % (24 * 60 * 60) == 23 * 60 * 60 && $endtime - $starttime > 24 * 60 * 60)
        $shifts_table .= date('y-m-d<b\r>H:i', $thistime);
      elseif ($thistime % (60 * 60) == 0)
        $shifts_table .= date("H:i", $thistime);
      $shifts_table .= "</th>";
      foreach ($myrooms as $room) {
        $rid = $room["id"];
        $empty_collides = false;
        foreach ($shifts as $shift) {
          if ($shift["RID"] == $rid) {
            if (floor($shift["start"] / (15 * 60)) == $thistime / (15 * 60)) {
              $blocks = ($shift["end"] - $shift["start"]) / (15 * 60);
              if ($blocks < 1)
                $blocks = 1;
              
              $collides = in_array($shift['SID'], array_keys($ownshifts));
              if (! $collides)
                foreach ($ownshifts as $ownshift) {
                  if ($ownshift['start'] < $shift['end'] && $ownshift['end'] > $shift['start']) {
                    $collides = true;
                    break;
                  }
                }
                
                // qqqqqq
              $is_free = false;
              $shifts_row = $shift['name'];
              if (in_array('admin_shifts', $privileges))
                $shifts_row .= ' ' . img_button('?p=user_shifts&edit_shift=' . $shift['SID'], 'pencil', _("edit")) . img_button('?p=user_shifts&delete_shift=' . $shift['SID'], 'bin', _("delete"));
              $shifts_row .= '<br />';
              $query = "SELECT `NeededAngelTypes`.`count`, `AngelTypes`.`id`, `AngelTypes`.`restricted`, `UserAngelTypes`.`confirm_user_id`, `AngelTypes`.`name`, `UserAngelTypes`.`user_id`
            FROM `NeededAngelTypes`
            JOIN `AngelTypes` ON (`NeededAngelTypes`.`angel_type_id` = `AngelTypes`.`id`)
            LEFT JOIN `UserAngelTypes` ON (`NeededAngelTypes`.`angel_type_id` = `UserAngelTypes`.`angeltype_id`AND `UserAngelTypes`.`user_id`=" . sql_escape($user['UID']) . ")
            WHERE
            `count` > 0
            AND ";
              if ($shift['has_special_needs'])
                $query .= "`shift_id` = " . sql_escape($shift['SID']);
              else
                $query .= "`room_id` = " . sql_escape($shift['RID']);
              if (! empty($_SESSION['user_shifts']['types']))
                $query .= " AND `angel_type_id` IN (" . implode(',', $_SESSION['user_shifts']['types']) . ") ";
              $query .= " ORDER BY `AngelTypes`.`name`";
              $angeltypes = sql_select($query);
              
              if (count($angeltypes) > 0) {
                foreach ($angeltypes as $angeltype) {
                  $entries = sql_select("SELECT * FROM `ShiftEntry` JOIN `User` ON (`ShiftEntry`.`UID` = `User`.`UID`) WHERE `SID`=" . sql_escape($shift['SID']) . " AND `TID`=" . sql_escape($angeltype['id']) . " ORDER BY `Nick`");
                  $entry_list = array();
                  foreach ($entries as $entry) {
                    if ($entry['Gekommen'] == 1)
                      $style = "font-weight:bold;";
                    else
                      $style = "font-weight:normal;";
                    if (in_array('user_shifts_admin', $privileges))
                      $entry_list[] = "<span style=\"$style\">" . User_Nick_render($entry) . ' ' . img_button(page_link_to('user_shifts') . '&entry_id=' . $entry['id'], 'bin', _("delete")) . '</span>';
                    else
                      $entry_list[] = "<span style=\"$style\">" . User_Nick_render($entry) . "</span>";
                  }
                  if ($angeltype['count'] - count($entries) > 0) {
                    $inner_text = sprintf(ngettext("%d helper needed", "%d helpers needed", $angeltype['count'] - count($entries)), $angeltype['count'] - count($entries));
                    // is the shift still running or alternatively is the user shift admin?
                    $user_may_join_shift = true;
                    
                    // you cannot join if user alread joined a parallel or this shift
                    $user_may_join_shift &= ! $collides;
                    
                    // you cannot join if user is not of this angel type
                    $user_may_join_shift &= isset($angeltype['user_id']);
                    
                    // you cannot join if you are not confirmed
                    if ($angeltype['restricted'] == 1 && isset($angeltype['user_id']))
                      $user_may_join_shift &= isset($angeltype['confirm_user_id']);
                      
                      // you can only join if the shift is in future or running
                    $user_may_join_shift &= time() < $shift['start'];
                    
                    // User shift admins may join anybody in every shift
                    $user_may_join_shift |= in_array('user_shifts_admin', $privileges);
                    if ($user_may_join_shift)
                      $entry_list[] = '<a href="' . page_link_to('user_shifts') . '&amp;shift_id=' . $shift['SID'] . '&amp;type_id=' . $angeltype['id'] . '">' . $inner_text . '&nbsp;&raquo;</a>';
                    else {
                      if (time() > $shift['start'])
                        $entry_list[] = $inner_text . ' (vorbei)';
                      elseif ($angeltype['restricted'] == 1 && isset($angeltype['user_id']) && ! isset($angeltype['confirm_user_id']))
                        $entry_list[] = $inner_text . ' <img src="pic/lock.png" alt="unconfirmed" title="' . _("You are not confirmed for this angel type.") . '" />';
                      elseif ($collides)
                        $entry_list[] = $inner_text;
                      else
                        $entry_list[] = $inner_text . ' <a href="' . page_link_to('user_settings') . '#angel_types_anchor">(Werde ' . $angeltype['name'] . ')</a>';
                    }
                    
                    unset($inner_text);
                    $is_free = true;
                  }
                  
                  $shifts_row .= '<b>' . $angeltype['name'] . ':</b> ';
                  $shifts_row .= join(", ", $entry_list);
                  $shifts_row .= '<br />';
                }
                if (in_array('user_shifts_admin', $privileges)) {
                  $shifts_row .= '<a href="' . page_link_to('user_shifts') . '&amp;shift_id=' . $shift['SID'] . '&amp;type_id=' . $angeltype['id'] . '">' . _("Add more angels") .'&nbsp;&raquo;</a>';
                }
              }
              if ($shift['own'] && ! in_array('user_shifts_admin', $privileges))
                $class = 'own';
              elseif ($collides && ! in_array('user_shifts_admin', $privileges))
                $class = 'collides';
              elseif ($is_free)
                $class = 'free';
              else
                $class = 'occupied';
              $shifts_table .= '<td rowspan="' . $blocks . '" class="' . $class . '">';
              if (($is_free && in_array(0, $_SESSION['user_shifts']['filled'])) || (! $is_free && in_array(1, $_SESSION['user_shifts']['filled']))) {
                $shifts_table .= $shifts_row;
              }
              $shifts_table .= "</td>";
              for ($j = 0; $j < $blocks && $i + $j < $maxshow; $j ++) {
                $todo[$rid][$i + $j] --;
              }
            }
          }
          if ($shift['own'] && ! in_array('user_shifts_admin', $privileges)) {
            $blocks = ($shift["end"] - $shift["start"]) / (15 * 60);
            $firstblock = floor(($shift["start"] - $first) / (15 * 60));
            if ($i >= $firstblock && $i < $firstblock + $blocks)
              $empty_collides = true;
          }
        }
        // fill up row with empty <td>
        while ($todo[$rid][$i] -- > 0)
          $shifts_table .= '<td class="' . ($empty_collides ? 'collides ' : '') . 'empty"></td>';
      }
      $shifts_table .= "</tr>\n";
    }
    $shifts_table .= '</tbody></table><script type="text/javascript">document.getElementById("shifts").style.maxHeight = (window.innerHeight - 100) + "px";</script>';
    // qqq
  } else {
    $shifts_table = array();
    foreach ($shifts as $shift) {
      $info = array();
      if ($_SESSION['user_shifts']['start_day'] != $_SESSION['user_shifts']['end_day'])
        $info[] = date("Y-m-d", $shift['start']);
      $info[] = date("H:i", $shift['start']) . ' - ' . date("H:i", $shift['end']);
      if (count($_SESSION['user_shifts']['rooms']) > 1)
        $info[] = $shift['room_name'];
      
      $shift_row = array(
          'info' => join('<br />', $info),
          'entries' => $shift['name'] 
      );
      
      if (in_array('admin_shifts', $privileges))
        $shift_row['info'] .= ' ' . img_button('?p=user_shifts&edit_shift=' . $shift['SID'], 'pencil', 'edit') . img_button('?p=user_shifts&delete_shift=' . $shift['SID'], 'bin', _("delete"));
      $shift_row['entries'] .= '<br />';
      $is_free = false;
      $shift_has_special_needs = 0 < sql_num_query("SELECT `id` FROM `NeededAngelTypes` WHERE `shift_id` = " . $shift['SID']);
      $query = "SELECT `NeededAngelTypes`.`count`, `AngelTypes`.`id`, `AngelTypes`.`restricted`, `UserAngelTypes`.`confirm_user_id`, `AngelTypes`.`name`, `UserAngelTypes`.`user_id`
    FROM `NeededAngelTypes`
    JOIN `AngelTypes` ON (`NeededAngelTypes`.`angel_type_id` = `AngelTypes`.`id`)
    LEFT JOIN `UserAngelTypes` ON (`NeededAngelTypes`.`angel_type_id` = `UserAngelTypes`.`angeltype_id`AND `UserAngelTypes`.`user_id`=" . sql_escape($user['UID']) . ")
    WHERE ";
      if ($shift_has_special_needs)
        $query .= "`shift_id` = " . sql_escape($shift['SID']);
      else
        $query .= "`room_id` = " . sql_escape($shift['RID']);
      $query .= "               AND `count` > 0 ";
      if (! empty($_SESSION['user_shifts']['types']))
        $query .= "AND `angel_type_id` IN (" . implode(',', $_SESSION['user_shifts']['types']) . ") ";
      $query .= "ORDER BY `AngelTypes`.`name`";
      $angeltypes = sql_select($query);
      if (count($angeltypes) > 0) {
        $my_shift = sql_num_query("SELECT * FROM `ShiftEntry` WHERE `SID`=" . sql_escape($shift['SID']) . " AND `UID`=" . sql_escape($user['UID']) . " LIMIT 1") > 0;
        foreach ($angeltypes as &$angeltype) {
          $entries = sql_select("SELECT * FROM `ShiftEntry` JOIN `User` ON (`ShiftEntry`.`UID` = `User`.`UID`) WHERE `SID`=" . sql_escape($shift['SID']) . " AND `TID`=" . sql_escape($angeltype['id']) . " ORDER BY `Nick`");
          $entry_list = array();
          foreach ($entries as $entry) {
            if (in_array('user_shifts_admin', $privileges))
              $entry_list[] = User_Nick_render($entry) . ' ' . img_button(page_link_to('user_shifts') . '&entry_id=' . $entry['id'], 'bin', _("delete"));
            else
              $entry_list[] = User_Nick_render($entry);
          }
          $angeltype['taken'] = count($entries);
          // do we need more angles of this type?
          if ($angeltype['count'] - count($entries) > 0) {
            $inner_text = sprintf(ngettext("%d helper needed", "%d helpers needed", $angeltype['count'] - count($entries)), $angeltype['count'] - count($entries));
            // is the shift still running or alternatively is the user shift admin?
            $user_may_join_shift = true;
            
            /* you cannot join if user already joined this shift */
            $user_may_join_shift &= ! $my_shift;
            
            // you cannot join if user is not of this angel type
            $user_may_join_shift &= isset($angeltype['user_id']);
            
            // you cannot join if you are not confirmed
            if ($angeltype['restricted'] == 1 && isset($angeltype['user_id']))
              $user_may_join_shift &= isset($angeltype['confirm_user_id']);
              
              // you can only join if the shift is in future or running
            $user_may_join_shift &= time() < $shift['start'];
            
            // User shift admins may join anybody in every shift
            $user_may_join_shift |= in_array('user_shifts_admin', $privileges);
            if ($user_may_join_shift)
              $entry_list[] = '<a href="' . page_link_to('user_shifts') . '&amp;shift_id=' . $shift['SID'] . '&amp;type_id=' . $angeltype['id'] . '">' . $inner_text . ' &raquo;</a>';
            else {
              if (time() > $shift['end']) {
                $entry_list[] = $inner_text . ' (vorbei)';
              } elseif ($angeltype['restricted'] == 1 && isset($angeltype['user_id']) && ! isset($angeltype['confirm_user_id'])) {
                $entry_list[] = $inner_text . ' <img src="pic/lock.png" alt="unconfirmed" title="Du bist für diesen Engeltyp noch nicht freigeschaltet." />';
              } else {
                $entry_list[] = $inner_text . ' <a href="' . page_link_to('user_settings') . '#angel_types_anchor">(Werde ' . $angeltype['name'] . ')</a>';
              }
            }
            
            unset($inner_text);
            $is_free = true;
          }
          
          $shift_row['entries'] .= '<b>' . $angeltype['name'] . ':</b> ';
          $shift_row['entries'] .= join(", ", $entry_list);
          $shift_row['entries'] .= '<br />';
        }
        if (in_array('user_shifts_admin', $privileges)) {
          $shift_row['entries'] .= '<a href="' . page_link_to('user_shifts') . '&amp;shift_id=' . $shift['SID'] . '&amp;type_id=' . $angeltype['id'] . '">Weitere Helfer eintragen &raquo;</a>';
        }
        if (($is_free && in_array(0, $_SESSION['user_shifts']['filled'])) || (! $is_free && in_array(1, $_SESSION['user_shifts']['filled']))) {
          $shifts_table[] = $shift_row;
          $shift['angeltypes'] = $angeltypes;
          $ical_shifts[] = $shift;
        }
      }
    }
    $shifts_table = table(array(
        'info' => _("Time") . "/" . _("Room"),
        'entries' => _("Entries") 
    ), $shifts_table);
  }
  
  if ($user['api_key'] == "")
    User_reset_api_key($user);
  
  return msg() . template_render('../templates/user_shifts.html', array(
      'room_select' => make_select($rooms, $_SESSION['user_shifts']['rooms'], "rooms", _("Rooms")),
      'start_select' => html_select_key("start_day", "start_day", array_combine($days, $days), $_SESSION['user_shifts']['start_day']),
      'start_time' => $_SESSION['user_shifts']['start_time'],
      'end_select' => html_select_key("end_day", "end_day", array_combine($days, $days), $_SESSION['user_shifts']['end_day']),
      'end_time' => $_SESSION['user_shifts']['end_time'],
      'type_select' => make_select($types, $_SESSION['user_shifts']['types'], "types", _("Tasks") . '<sup>1</sup>'),
      'filled_select' => make_select($filled, $_SESSION['user_shifts']['filled'], "filled", _("Occupancy")),
      'task_notice' => '<sup>1</sup>' . _("The tasks shown here are influenced by the preferences you defined in your settings!") . " <a href=\"https://events.ccc.de/congress/2013/wiki/Volunteers#What_kind_of_volunteers_are_needed.3F\">" . _("Description of the jobs.") . "</a>",
      'new_style_checkbox' => '<label><input type="checkbox" name="new_style" value="1" ' . ($_SESSION['user_shifts']['new_style'] ? ' checked' : '') . '> ' . _("Use new style if possible") . '</label>',
      'shifts_table' => $shifts_table,
      'ical_text' => '<h2>' . _("iCal export") . '</h2><p>' . sprintf(_("Export of shown shifts. <a href=\"%s\">iCal format</a> or <a href=\"%s\">JSON format</a> available (please keep secret, otherwise <a href=\"%s\">reset the api key</a>)."), page_link_to_absolute('ical') . '&key=' . $user['api_key'], page_link_to_absolute('shifts_json_export') . '&key=' . $user['api_key'], page_link_to('user_myshifts') . '&reset') . '</p>',
      'filter' => _("Filter")
  ));
}

function make_user_shifts_export_link($page, $key) {
  $link = "&start_day=" . $_SESSION['user_shifts']['start_day'];
  $link = "&start_time=" . $_SESSION['user_shifts']['start_time'];
  $link = "&end_day=" . $_SESSION['user_shifts']['end_day'];
  $link = "&end_time=" . $_SESSION['user_shifts']['end_time'];
  foreach ($_SESSION['user_shifts']['rooms'] as $room)
    $link .= '&rooms[]=' . $room;
  foreach ($_SESSION['user_shifts']['types'] as $type)
    $link .= '&types[]=' . $type;
  foreach ($_SESSION['user_shifts']['filled'] as $filled)
    $link .= '&filled[]=' . $filled;
  return page_link_to_absolute($page) . $link . '&export=user_shifts&key=' . $key;
}

function get_ids_from_array($array) {
  return $array["id"];
}

function make_select($items, $selected, $name, $title = null) {
  $html_items = array();
  if (isset($title))
    $html_items[] = '<li class="heading">' . $title . '</li>' . "\n";
  
  foreach ($items as $i)
    $html_items[] = '<li><label><input type="checkbox" name="' . $name . '[]" value="' . $i['id'] . '"' . (in_array($i['id'], $selected) ? ' checked="checked"' : '') . '> ' . $i['name'] . '</label>' . (! isset($i['enabled']) || $i['enabled'] ? '' : ' <img src="pic/lock.png" alt="unconfirmed" title="Du bist für diesen Engeltyp noch nicht freigeschaltet." />') . '</li>';
  $html = '<div class="selection ' . $name . '">' . "\n";
  $html .= '<ul id="selection_' . $name . '">' . "\n";
  $html .= implode("\n", $html_items);
  $html .= '</ul>' . "\n";
  $html .= buttons(array(
      button("javascript: check_all('selection_" . $name . "')", _("All"), ""),
      button("javascript: uncheck_all('selection_" . $name . "')", _("None"), "") 
  ));
  $html .= '</div>' . "\n";
  return $html;
}
?>