function doPost(e) {
  try {
    var contents = e.postData.contents;
    var data = JSON.parse(contents);
    var folderId = data.folderId;
    
    if (!folderId) {
      return responseJSON({ status: "error", message: "ID Folder Drive tidak ditemukan/belum diatur." });
    }

    var targetFolder = DriveApp.getFolderById(folderId);

    // Simpan file yang diunggah oleh siswa
    if (data.files && data.files.length > 0) {
      for (var i = 0; i < data.files.length; i++) {
        var fileObj = data.files[i];
        var bytes = Utilities.base64Decode(fileObj.base64);
        var blob = Utilities.newBlob(
          bytes, 
          fileObj.type || "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", 
          "Absen " + data.absen + " - " + data.nama + " - " + fileObj.name
        );
        targetFolder.createFile(blob);
      }
    }

    return responseJSON({ status: "success", message: "File berhasil disimpan ke Google Drive!" });
  } catch (err) {
    return responseJSON({ status: "error", message: err.toString() });
  }
}

function doOptions(e) {
  return ContentService.createTextOutput("")
    .setMimeType(ContentService.MimeType.TEXT);
}

function responseJSON(data) {
  return ContentService.createTextOutput(JSON.stringify(data))
    .setMimeType(ContentService.MimeType.JSON);
}