<?php
function responsive_cell_html($cell, $query_strings, $s, $is_invalid = FALSE)
{
  // draws a single cell in the main table of the day and week views
  //
  // $cell is a two dimensional array that is part of the map of the whole
  // display and looks like this:
  //
  // $cell[n][id]
  //         [is_repeat]
  //         [is_multiday_start]
  //         [is_multiday_end]
  //         [color]
  //         [data]
  //         [long_descr]
  //         [create_by]
  //         [room_id]
  //         [start_time]
  //         [slots]
  //         [status]
  //
  // where n is the number of the booking in the cell.    There can be none, one or many
  // bookings in a cell.    If there are no bookings then a blank cell is drawn with a link
  // to the edit entry form.     If there is one booking, then the booking is shown in that
  // cell.    If there is more than one booking then all the bookings are shown, but they can
  // be shown in two different ways: minimised and maximised.   By default they are shown
  // minimised, so that the standard row height is preserved.   By clicking a control
  // the cell can be maximised.   (Multiple bookings can arise in a cell if the resolution
  // of an existing database in increased or the booking day is shifted).

  // $query_strings is an array containg the query strings (or partial query strings) to be
  // appended to the link used for the cell.    It is indexed as follows:
  //    ['new_periods']   the string to be used for an empty cell if using periods
  //    ['new_times']     the string to be used for an empty cell if using times
  //    ['booking']       the string to be used for a full cell
  //
  // $is_invalid specifies whether the slot actually exists or is one of the non-existent
  // slots in the transition to DST

  global $main_cell_height, $main_table_cell_border_width;
  global $area, $year, $month, $timetohighlight;
  global $enable_periods, $times_along_top, $show_plus_link;
  global $approval_enabled, $confirmation_enabled;

  $html = '';
  $user = getUserName();

  // if the time slot has got multiple bookings, then draw a mini-table
  if(isset($cell[1]["id"]))
  {
    // Find out how many bookings there are (needed to calculate heights)
    $n_bookings = 0;
    while (isset($cell[$n_bookings]["id"]))
    {
      $n_bookings++;
    }

    // Make the class maximized by default so that if you don't have JavaScript then
    // you can still see all the bookings.    If you have JavaScript it will overwrite
    // the class and make it minimized.
    $html .= "<td class=\"multiple_booking maximized\">\n";

    // First draw the mini table
    $html .= "<div class=\"celldiv slots1 mini\">\n";
    $html .= "<div class=\"multiple_control\">+</div>\n";
    $html .= "<table>\n";
    $html .= "<tbody>\n";

    $row_height = $main_cell_height - (($n_bookings-1) * $main_table_cell_border_width);   // subtract the borders (first row has no top border)
    $row_height = $row_height/$n_bookings;  // split what's left between the bookings
    $row_height = (int) ceil($row_height);  // round up, so that (a) there's no empty space at the bottom
                                            // and (b) each stripe is at least 1 unit high
    for ($n=0; $n<$n_bookings; $n++)
    {
      $id          = $cell[$n]["id"];
      $is_repeat   = $cell[$n]["is_repeat"];
      $is_multiday_start = $cell[$n]["is_multiday_start"];
      $is_multiday_end   = $cell[$n]["is_multiday_end"];
      $status      = $cell[$n]["status"];
      $color       = $cell[$n]["color"];
      $descr       = htmlspecialchars($cell[$n]["data"]);
      $long_descr  = htmlspecialchars($cell[$n]["long_descr"]);
      $class = $color;
      if ($status & STATUS_PRIVATE)
      {
        $class .= " private";
      }
      if ($approval_enabled && ($status & STATUS_AWAITING_APPROVAL))
      {
        $class .= " awaiting_approval";
      }
      if ($confirmation_enabled && ($status & STATUS_TENTATIVE))
      {
        $class .= " tentative";
      }
      if ($is_multiday_start)
      {
        $class .= " multiday_start";
      }
      if ($is_multiday_end)
      {
        $class .= " multiday_end";
      }

      $html .= "<tr>\n";
      $html .= "<td class=\"$class\"" .
               (($n==0) ? " style=\"border-top-width: 0\"" : "") .   // no border for first row
               ">\n";
      $html .= "<div style=\"overflow: hidden; " .
               "height: " . $row_height . "px; " .
               "max-height: " . $row_height . "px; " .
               "min-height: " . $row_height . "px\">\n";
      $html .= "&nbsp;\n";
      $html .= "</div>\n";
      $html .= "</td>\n";
      $html .= "</tr>\n";
    }
    $html .= "</tbody>\n";
    $html .= "</table>\n";
    $html .= "</div>\n";

    // Now draw the maxi table
    $html .= "<div class=\"maxi\">\n";
    $total_height = $n_bookings * $main_cell_height;
    $total_height += ($n_bookings - 1) * $main_table_cell_border_width;  // (first row has no top border)
    $html .= "<div class=\"multiple_control\" " .
             "style =\"height: " . $total_height . "px; " .
                      "min-height: " . $total_height . "px; " .
                      "max-height: " . $total_height . "px; " .
             "\">-</div>\n";
    $html .= "<table>\n";
    $html .= "<tbody>\n";
    for ($n=0; $n<$n_bookings; $n++)
    {
      $id          = $cell[$n]["id"];
      $is_repeat   = $cell[$n]["is_repeat"];
      $is_multiday_start = $cell[$n]["is_multiday_start"];
      $is_multiday_end   = $cell[$n]["is_multiday_end"];
      $status      = $cell[$n]["status"];
      $color       = $cell[$n]["color"];
      $descr       = htmlspecialchars($cell[$n]["start_time"] . " " . $cell[$n]["data"]);
      $long_descr  = htmlspecialchars($cell[$n]["long_descr"]);
      $class = $color;
      if ($status & STATUS_PRIVATE)
      {
        $class .= " private";
      }
      if ($approval_enabled && ($status & STATUS_AWAITING_APPROVAL))
      {
        $class .= " awaiting_approval";
      }
      if ($confirmation_enabled && ($status & STATUS_TENTATIVE))
      {
        $class .= " tentative";
      }
      if ($is_multiday_start)
      {
        $class .= " multiday_start";
      }
      if ($is_multiday_end)
      {
        $class .= " multiday_end";
      }
      $html .= "<tr>\n";
      $html .= "<td class=\"$class\"" .
               (($n==0) ? " style=\"border-top-width: 0\"" : "") .   // no border for first row
               ">\n";
      $html .= "<div class=\"celldiv slots1\">\n";     // we want clipping of overflow
      $html .= "<a href=\"r_view_entry.php?id=$id&". $query_strings['booking'] . "\" title=\"$long_descr\">";
      $html .= ($is_repeat) ? "<img class=\"repeat_symbol\" src=\"images/repeat.png\" alt=\"" . get_vocab("series") . "\" title=\"" . get_vocab("series") . "\" width=\"10\" height=\"10\">" : '';
      $html .= "$descr</a>\n";
      $html .= "</div>\n";

      $html .= "</td>\n";
      $html .= "</tr>\n";
    }
    $html .= "</tbody>\n";
    $html .= "</table>\n";
    $html .= "</div>\n";

    $html .= "</td>\n";
  }  // end of if isset ( ...[1]..)

  // otherwise draw a cell, showing either the booking or a blank cell
  else
  {
    if(isset($cell[0]["id"]))
    {
      $id         = $cell[0]["id"];
      $is_repeat  = $cell[0]["is_repeat"];
      $is_multiday_start = $cell[0]["is_multiday_start"];
      $is_multiday_end   = $cell[0]["is_multiday_end"];
      $status     = $cell[0]["status"];
      $color      = $cell[0]["color"];
      $descr      = htmlspecialchars($cell[0]["data"]);
      $long_descr = htmlspecialchars($cell[0]["long_descr"]);
      $slots      = $cell[0]["slots"];
    }
    else  // id not set
    {
      unset($id);
      $slots = 1;
    }

    // $c is the colour of the cell that the browser sees. Zebra stripes normally,
    // row_highlight if we're highlighting that line and the appropriate colour if
    // it is booked (determined by the type).
    // We tell if its booked by $id having something in it
    if (isset($id))
    {
      $c = $color;
      if ($status & STATUS_PRIVATE)
      {
        $c .= " private";
      }
      if ($approval_enabled && ($status & STATUS_AWAITING_APPROVAL))
      {
        $c .= " awaiting_approval";
      }
      if ($confirmation_enabled && ($status & STATUS_TENTATIVE))
      {
        $c .= " tentative";
      }
      if ($is_multiday_start)
      {
        $c .= " multiday_start";
      }
      if ($is_multiday_end)
      {
        $c .= " multiday_end";
      }
      // Add a class to bookings that this user is allowed to edit so that the
      // JavaScript can turn them into resizable bookings
      if (getWritable($cell[0]['create_by'], $user, $cell[0]['room_id']))
      {
        $c .= " writable";
        if ($is_repeat)
        {
          $c .= " series";
        }
      }
    }
    else
    {
      $c = ($is_invalid) ? "invalid" : "new";
    }

    // Don't put in a <td> cell if the slot is booked and there's no description.
    // This would mean that it's the second or subsequent slot of a booking and so the
    // <td> for the first slot would have had a rowspan that extended the cell down for
    // the number of slots of the booking.

    if (!(isset($id) && ($descr == "")))
    {
      $html .= tdcell($c, $slots);

      // If the room isn't booked then allow it to be booked
      if (!isset($id))
      {
        // Don't provide a link if the slot doesn't really exist
        if (!$is_invalid)
        {
          $html .= "<div class=\"celldiv slots1\">\n";  // a bookable slot is only one unit high
          $html .= "<a href=\"r_edit_entry.php?" .
                   (($enable_periods) ? $query_strings['new_periods'] : $query_strings['new_times']) .
                   "\">\n";
          if ($show_plus_link)
          {
            $html .= "<img src=\"images/new.gif\" alt=\"New\" width=\"10\" height=\"10\">\n";
          }
          $html .= gmdate("g:i A", $s);
          $html .= " </a>\n";
          $html .= "</div>\n";
        }
      }
      else                 // if it is booked then show the booking
      {
        $html .= "<div data-id=\"$id\" class=\"celldiv slots" .
                 (($times_along_top) ? "1" : $slots) .
                 "\">\n";
        $html .= "<a href=\"r_view_entry.php?id=$id&". $query_strings['booking'] . "\" title=\"$long_descr\">";
        $html .= ($is_repeat) ? "<img class=\"repeat_symbol $c\" src=\"images/repeat.png\" alt=\"" . get_vocab("series") . "\" title=\"" . get_vocab("series") . "\" width=\"10\" height=\"10\">" : '';
        $html .= "$descr</a>\n";
        $html .= "</div>\n";
      }
      $html .= "</td>\n";
    }
  }

  return $html;
}  // end function responsive_cell_html