<?php
  require 'db.inc';

  if ( ! isset($SESSIONS) ) {
    $result=$db->query("SELECT id,examples,nexamples FROM sessions ORDER BY id");
    $SESSIONS_next = -1;
    $SESSIONS_actual = -1;
    $SESSIONS_n = 0;
  
    while ($session = $result->fetch(PDO::FETCH_ASSOC)) {
      $SESSIONS[$session['id']] = array("id" => $session['id'], "timestr" => date("d.m.Y H:i", $session['id']),
        "workdone" => $db->query("SELECT COUNT(*) FROM workdone WHERE session=" . $session['id'])->fetch(PDO::FETCH_NUM)[0],
        "examples" => $session['examples'], "nexamples" => $session['nexamples']);
      if ( strtotime("now") < $session['id'] && ( $SESSIONS_next==-1 || $SESSIONS_next > $session['id'] )  ) {
        $SESSIONS_next = $session['id'];
      }
      if ( strtotime("now") < $session['id'] + 3600  && ( $SESSIONS_actual==-1 || $SESSIONS_actual > $session['id'] )  ) {
        $SESSIONS_actual = $session['id'];
      }
      $SESSIONS_n++;
    }
    if($SESSIONS_next == -1) unset($SESSIONS_next);
    if($SESSIONS_actual == -1) unset($SESSIONS_actual);

    $SESSIONS_totex = 0;
    if(isset($SESSIONS)) {
      foreach ($SESSIONS as $session) {
        if($session['id'] < $SESSIONS_next || (! isset($SESSIONS_next)) ) { $SESSIONS_totex += $session['nexamples']; }
	if( $session['id'] != $SESSIONS_actual ) { $SESSIONS_last = $session['id']; }
      }
    }

    $SESSIONS_totex_nextinc = 0;
    if( isset($SESSIONS) && isset($SESSIONS_next) ) {
      foreach ($SESSIONS as $session) {
        if($session['id'] <= $SESSIONS_next) { $SESSIONS_totex_nextinc += $session['nexamples']; }
      }
    }
  }
?>