<?
$pageCSS = array("http://tnsp.org/docs1.css", "luk.css");
$pageCharset = "iso-8859-15";
$luokkaDefault = "TTE9SNO";
$dataDir = "cache/";
$classFile = "luokat.txt";
$mapFile = "kartta.png";
$roomFile = "luokkatilat.txt";
$cacheFile = "coursecache.txt";
$baseURI = "http://tnsp.org/luk/";
//$infoURI = "http://www.oamk.fi/opiskelijalle/rakenne/opinto-opas/koulutusohjelmat/?sivu=oj&kieli=FI&opas=2010-2011&vuosi=10S11K&koodi1=";
$infoURI = "http://www.oamk.fi/opiskelijalle/rakenne/opinto-opas/koulutusohjelmat/?sivu=oj&kieli=FI&koodi1=";
$dayNames = array("Maanantai", "Tiistai", "Keskiviikko", "Torstai", "Perjantai", "Lauantai", "Sunnuntai");

$hourStamps = array(
  array( 8, 15),
  array( 9, 15),
  array(10, 15),
  array(11, 15),
  array(12, 15),
  array(13, 15),
  array(14, 15),
  array(15, 15),
  array(16, 15),
  array(17,  5),
  array(18,  5),
  array(19,  0),
  array(20, 45),
); 

// Include framework
require "mcommon.inc.php";
require "merrors.inc.php";


// Helper functions
function checkClassID(&$id)
{
  global $luokkaDefault;
  if (preg_match("#^([A-Z]{3}\d[A-Za-z0-9_]{1,6}|ccr|Ryh_[A-Z]{3}\d[A-Za-z0-9_]{1,6})$#", $id, $m)) {
    $id = $m[1];
    return TRUE;
  } else {
    errorMsg("Virhe! Luokan täytyy olla muotoa <b>XXXnXXX</b>, käytetään vakioarvoa <b>".$luokkaDefault."</b>.");
    $id = $luokkaDefault;
    return FALSE;
  }
}

// Check for mini-info mode
$miniMode = isset($_GET["nyt"]);

// Check given parameters
if (isset($_GET["luokka"])) {
  $luokka = $_GET["luokka"];
  if (checkClassID($luokka) && !$miniMode) {
    setcookie("lukluokka", $luokka, time() + 365*24*60*60); // expire in a year
  }
} else
if (isset($_COOKIE["lukluokka"])) {
  $luokka = $_COOKIE["lukluokka"];
  checkClassID($luokka);
} else {
  errorMsg("Luokkaa ei asetettu, käytetään vakioarvoa <b>".$luokkaDefault."</b>.");
  $luokka = $luokkaDefault;
}


if (isset($_GET["tila"])) {
  $tila = $_GET["tila"];
  echo "Luokkatilan n&auml;ytt&ouml;moodi ei viel&auml; tuettu.<br />\n";
  exit;

  $fp = @fopen($roomFile, "rb");
  if ($fp) {
    fclose($fp);
  }
}


function getHourStamp($hour, $sec = 0, $mon = 0, $day = 0, $year = 0)
{
  global $hourStamps;
  if (isset($hourStamps[$hour]))
    return mktime($hourStamps[$hour][0], $hourStamps[$hour][1], $sec, $mon, $year);
  else
    return mktime($hour + 8, 0, $sec, $mon, $year);
}
  

function getHour($hour)
{
  $stamp = getHourStamp($hour);
  return "<br />".date("H:i", $stamp)." - ".date("H:i", $stamp + 45 * 60)."<br /><br />";
}


function matchCourse($id)
{
  global $cache, $infoURI, $cacheDirty;

  // Check if course exists in cache
  if (!isset($cache[$id])) {
    $cacheDirty = TRUE;
    // Not cached, try to fetch data
    $data = @file_get_contents($infoURI.$id);
    if ($data !== FALSE) {
      if (preg_match("#<td class=\"smallheadercell\"><strong>(.+?)\s+(\d+)\s*op\s*</strong></td>#", $data, $m)) {
        // Add data to cache
        $cache[$id] = array("desc" => $m[1], "op" => intval($m[2]));
      }
    }
  }
  
  if (isset($cache[$id]))
    return "<a target=\"_blank\" title=\"".htmlentities($id." - ".$cache[$id]["op"]." op").
    "\" href=\"".htmlentities($infoURI.$id)."\">".htmlentities($cache[$id]["desc"])."</a>";
  else
    return htmlentities($id);
}


function matchClass($matches)
{
  global $baseURI;
  return "<b><a href=\"".$baseURI."?tila=".$matches[1]."\">".$matches[1]."</a></b> ".$matches[2];
}


// Global cache for course data
$cache = array();
$cacheDirty = FALSE;


// Try to read cachefile, if we can get file lock on it
$fp = @fopen($cacheFile, "rb");
if ($fp) {
  if (flock($fp, LOCK_SH)) { 
    require($cacheFile);
    flock($fp, LOCK_UN);
  }
  fclose($fp);
}

// Read classfile
$fp = @fopen($classFile, "rb");
$classes = array();
if ($fp) {
  if (flock($fp, LOCK_SH)) { 
    while (!feof($fp)) {
      $str = trim(fgets($fp, 128));
      if ($str[0] != "#" && strlen($str) > 2)
        $classes[] = $str;
    }
    flock($fp, LOCK_UN);
  }
  fclose($fp);
} else {
  errorMsg("Luokkien listaa ei löytynyt. Kokeile ladata sivu uudelleen hetken kuluttua.");
}

if (isset($_GET["next"]))
  $dataFile = "cache-next/".$luokka.".data";
else
  $dataFile = "cache/".$luokka.".data";

if (!file_exists($dataFile)) {
  errorMsg("Luokan ".htmlentities($luokka)." tietoja ei löytynyt! Jos luokkakoodi on uusi, ilmestyy se järjestelmään seuraavan päivityksen aikana. Luokkatiedot päivitetään 2 kertaa vuorokaudessa.");
  $haveData = FALSE;
} else {
  require($dataFile);
  $haveData = isset($classDefs);
}


function printHourInfo($dayHours, $showDays)
{
  $out = " <tr>\n  <td>Tunteja<br />(<b>ryhmä/vv</b>)</td>\n";
  for ($day = 0; $day < $showDays; $day++) {
    $out .=  "  <td>".$dayHours[$day]["total"]."h (<b>".$dayHours[$day]["grouped"]."h</b>)</td>\n";
  }
  return $out." </tr>\n";
}


function findHours($start, $day, $cmp, $mark = FALSE)
{
  global $classHourTable, $classInfo;
  $n = 0;
  for ($i = $start; $i < $classInfo["maxhours"]; $i++)
  if ($classHourTable[$i][$day] == $cmp) {
    if ($mark) $classHourTable[$i][$day] = -9999;
    $n++;
  } else
    break;
  return $n;
}


function findNextHour(&$j, &$i, $day, $hour, $chk)
{
  global $classInfo, $classHourTable;
//  for ($j = $day; $j < $classInfo["maxdays"]; $j++)
    $j = $day;
    for ($i = $hour; $i < $classInfo["maxhours"]; $i++) {
      if ($chk > 0 && $classHourTable[$i][$j] != $chk)
        return $classHourTable[$i][$j];

      if ($classHourTable[$i][$j] > 0 && $classHourTable[$i][$j] != $chk)
        return $classHourTable[$i][$j];
    }

  return -1;
}


function getHourInfo($isSplit, $d)
{
  if ($isSplit) {
    $out = "<table>".
    "<tr><td>".matchCourse($d[0])."</td><td>".matchCourse($d[1])."</td></tr>";

    for ($j = 2; $j < count($d); $j += 2)
      $out .= "<tr><td>".htmlentities($d[$j])."</td><td>".(isset($d[$j+1]) ? htmlentities($d[$j+1]) : "")."</td></tr>";
    
    return $out."</table>";
  } else {
    $out = matchCourse($d[0])."<br />";

    for ($j = 1; $j < count($d); $j++)
      $out .= htmlentities($d[$j])."<br />";

    return $out;
  }
}


function getHourInfoData($id)
{
  global $classDefs;

  if (isset($id)) {
    if ($id >= 0 && isset($classDefs[$id])) {
      $i = $classDefs[$id];
      $isSplit = preg_match("/^[A-Z]\d{6}$/", $i["data"][1]);
      return getHourInfo($isSplit, $i["data"]);
    } else
      return "<p>Ei tunteja.</p>";
  } else
    return "<p>Ei mitään.</p>";

  return "";
}


if ($miniMode) {
  $stamp = time();
  $aika = getdate($stamp);
  $day = $aika["wday"] - 1;
  if ($day < 0) $day = 7;
  $hour = $aika["hours"] - 8;

  $id = $classHourTable[$hour][$day];

  $out = "<div class=\"content\">\n".
  "<h2>".$dayNames[$day]." ".date("d.n.Y", $stamp)." - klo ".date("H:i", $stamp)."</h2>\n".
  getHourInfoData($id)."\n";
  

  if (isset($id) && $id >= 0 && isset($classDefs[$id])) {
    $i = $classDefs[$id];
    $start = getHourStamp($i["start"]);
  }

//  echo "day=$day, hour=$hour, id=$id<br />\n";
  
  if ($day >= $classInfo["maxdays"]) {
    $day = $hour = 0;
    $id = -1;
  } else
  if ($hour < 0) {
    $hour = 0;
    $id = -1;
  } else
  if ($hour >= $classInfo["maxhours"]) {
    $day++;
    $hour = 0;
    $id = -1;
  }

//  echo "day=$day, hour=$hour, id=$id<br />\n";
  $found = findNextHour($nday, $nhour, $day, $hour, $id);

//  echo "nday=$nday, nhour=$nhour, id=$found<br />\n";

  $out .= "<h2>Seuraavaksi";
  if ($found > 0) {
    $stamp = getHourStamp($nhour, 0, 0, $aika["mon"], $aika["mday"] + $nday - $day, $aika["year"]);
    $aika = getdate($stamp);
    $out .= ": ".$dayNames[$nday]." ".date("d.n.Y", $stamp)." - klo ".date("H:i", $stamp)."</h2>\n".
    getHourInfoData($found)."\n";
  } else {
    $out .= "</h2>\n".
    "<p>Ei mitään</p>\n";
  }

  $out .= "</div>\n";
}
else
if ($haveData) {
  $totalHours = 0;
  $totalGrouped = 0;
  $dayHours = array();

  for ($day = 0; $day < $classInfo["maxdays"]; $day++) {
    $dayHours[$day]["total"] = $dayHours[$day]["grouped"] = 0;

    for ($hour = 0; $hour < $classInfo["maxhours"]; $hour++)  {
      $id = $classHourTable[$hour][$day];

      if ($id > 0) {
        $totalHours++;
        $dayHours[$day]["total"]++;

        if ($classDefs[$id]["grouped"]) {
          $totalGrouped++;
          $dayHours[$day]["grouped"]++;
        }
      }
    }
  }

  // Create the timetable table
  $out =
  "<p>".join("; ", $classInfo["general"])."</p>\n".
  "<div>Viikossa yhteensä <b>".$totalHours."</b> tuntia, joista <b>".$totalGrouped."</b> ryhmissä tai vuoroviikoin.</div>\n".
  "<table class=\"timetable\">".
  " <tr>\n  <th></th>\n";
  for ($day = 0; $day < $classInfo["maxdays"]; $day++) {
    $out .=  "  <th style=\"width: ".(100 / $classInfo["maxdays"]).
      "%;\" class=\"days\">".$dayNames[$day]."</th>\n";
  }
  $out .= " </tr>\n";

for ($hour = 0; $hour < $classInfo["maxhours"]; $hour++) {
  $out .= " <tr>\n".
  "  <th class=\"hours\">".getHour($hour)."</th>\n";
  for ($day = 0; $day < $classInfo["maxdays"]; $day++) {
    if (isset($classHourTable[$hour][$day])) {
      $h = $classHourTable[$hour][$day];
        
      if ($h < 1) {
        if ($h > -9999) {
          $n = findHours($hour, $day, $h, TRUE);
          $out .= "  <td rowspan=\"".$n."\" class=\"clnothing\"></td>\n";
        }
      } else
      if (isset($classDefs[$h])) {
        if (!isset($classDefs[$h]["done"])) {
          $classDefs[$h]["done"] = true;
          $i = $classDefs[$h];
          $d = $classDefs[$h]["data"];
          
          $isSplit = preg_match("/^[A-Z]\d{6}$/", $d[1]);
          
          $hours = findHours($hour, $day, $h, FALSE);
          if ($hours != $i["hours"]) {
            errorMsg("Internal error, cell $hour / $day : hour id $h hours ($hours) do not match ".$i["hours"]."!");
          }
          
          $out .= "  <td rowspan=\"".$hours.
          "\" class=\"".($isSplit || $i["grouped"] ? "clgrouped" : "clnormal")."\">".
          getHourInfo($isSplit, $d).
          "<div class=\"nhours\"><span>".$hours."h</span></div></td>\n";
        }
      } else
        errorMsg("Internal error cell $hour / $day : hour id $h does not exist!");
    } else
      errorMsg("Internal error, cell $hour / $day does not exist.");
  }
  $out .= " </tr>\n";
}

  $out .= printHourInfo($dayHours, $classInfo["maxdays"]).
  "</table>\n";

} // haveData


$pageTitle = $haveData ? $luokka." / ".join("; ", $classInfo["info"]) : $luokka;
printPageHeader($pageTitle);

if ($miniMode) echo "<div id=\"mini\">\n";

echo
"<form id=\"controls\" action=\"".$baseURI."\" method=\"get\">
 <table>
  <tr>
   <td>
    <select name=\"luokka\">
";

foreach ($classes as $class) {
  echo "     <option ".($luokka == $class ? "selected=\"selected\" " : "")."value=\"".$class."\">".htmlentities($class)."</option>\n";
}
echo 
"    </select>
   </td>
   <td><input type=\"submit\" value=\" Vaihda \" /></td>
   <td>[<a href=\"".$baseURI."?luokka=".$luokka;

if ($miniMode)
  echo "\">Normaali";
else
  echo "&amp;nyt\">Mini-info";

echo "</a>]</td>
   <td>[<a href=\"http://www.oamk.fi/tyojarjestykset/otek/luokat/OR_".$luokka.".htm\">Alkuperäinen</a>]</td>
   <td>[<a href=\"".$baseURI."?next\">Seuraava periodi</a>]</td>
  </tr>
 </table>
</form>
";

echo "<h1>".$pageTitle."</h1>\n";

// Show error messages
if ($errorSet) {
  echo "<ul>\n";
  foreach ($errorMsgs as $msg)
    echo "<li>$msg</li>\n";
  echo "</ul>\n";
}

echo $out;

echo "<div style=\"position: relative; top: 5em; font-size: 5pt;\"><hr />
Yhteydenotot <b>ccr @ IRCNet</b> tai <b>ccr at tnsp dot org</b>. En vastaa mahdollisista virheistä tiedoissa!
</div>
";

if ($miniMode) echo "</div>\n";
printPageFooter();


// Dump the course data cache, but only if it has changed
if ($cacheDirty) {
  // Create string containing the data
  $str = "<?\n\$cache = array(\n";
  foreach ($cache as $id => $data) {
    $str .= "  \"".addslashes($id)."\" => array(\"desc\" => \"".
            addslashes($data["desc"])."\", \"op\" => ".$data["op"]."),\n";
  }
  $str .= ");\n?>";
  
  // Use locking to prevent concurrent access and dump data
  if (file_put_contents($cacheFile, $str, LOCK_EX) === FALSE) {
    // Can't do much anything here ..
  }
}

?>