//AyaPolaris 自主學習平台（2026-07-08 Phase 0；學生 unidata.t_stddata 權威、教師 t_admin/t_member；命名空間 ayapolaris_*）
  if($_SESSION['website']=="ayapolaris"){
    $_SESSION["uid"] = explode("@",$_SESSION["email"])[0];
    $domain = explode("@",$_SESSION["email"])[1];

    //學生：以 unidata.t_stddata 為權威，Google 顯示名（班級3碼+座號2碼+姓名）為 fallback
    if($domain == "std.dysh.tyc.edu.tw"){
      $sid = $_SESSION["uid"];
      $class=""; $seatno=""; $gecos=$_SESSION["name"];
      if($st = mysqli_prepare($mysql_unidata_link, "SELECT class,seatno,name FROM unidata.t_stddata WHERE sid=? LIMIT 1")){
        mysqli_stmt_bind_param($st,"s",$sid);
        mysqli_stmt_execute($st);
        mysqli_stmt_bind_result($st,$c,$s,$n);
        if(mysqli_stmt_fetch($st)){ $class=(string)$c; $seatno=(string)$s; $gecos=$n; }
        mysqli_stmt_close($st);
      }
      if($class==="" && preg_match('/^\d{5}/',$_SESSION["name"])){   //fallback：解析顯示名
        $class=substr($_SESSION["name"],0,3);
        $seatno=(string)intval(substr($_SESSION["name"],3,2));
        $gecos=substr($_SESSION["name"],5);
      }
      $_SESSION["class"]=$class;
      $_SESSION["seatno"]=$seatno;
      $_SESSION["gecos"]=$gecos;
      $_SESSION["ayapolaris_auth"]=1;
      $_SESSION["ayapolaris_role"]="student";
      header("Location:https://sys.dysh.tyc.edu.tw/AyaPolaris/student/index.php");
      exit();
    }
    //教師網域：t_admin(active)→admin；t_member(approved)→teacher；皆非→拒絕
    if($domain == "dysh.tyc.edu.tw"){
      $acct=$_SESSION["uid"];
      $_SESSION["gecos"]=$_SESSION["name"];
      $role="";
      if($a = mysqli_prepare($mysql_unidata_link,"SELECT 1 FROM unidata.t_admin WHERE account=? AND active=1 LIMIT 1")){
        mysqli_stmt_bind_param($a,"s",$acct); mysqli_stmt_execute($a); mysqli_stmt_store_result($a);
        if(mysqli_stmt_num_rows($a)>0){ $role="admin"; } mysqli_stmt_close($a);
      }
      if($role==="" && ($m = mysqli_prepare($mysql_unidata_link,"SELECT 1 FROM unidata.t_member WHERE ldap=? AND approved=1 LIMIT 1"))){
        mysqli_stmt_bind_param($m,"s",$acct); mysqli_stmt_execute($m); mysqli_stmt_store_result($m);
        if(mysqli_stmt_num_rows($m)>0){ $role="teacher"; } mysqli_stmt_close($m);
      }
      if($role===""){
        header("Location:https://sys.dysh.tyc.edu.tw/AyaPolaris/login.php?msg=unauthorized");
        exit();
      }
      $_SESSION["ayapolaris_auth"]=1;
      $_SESSION["ayapolaris_role"]=$role;   // admin / teacher
      header("Location:https://sys.dysh.tyc.edu.tw/AyaPolaris/".($role=="admin"?"admin/index.php":"teacher/index.php"));
      exit();
    }
    //非本校網域
    header("Location:https://sys.dysh.tyc.edu.tw/AyaPolaris/login.php?msg=domain");
    exit();
  }