package at.gv.egiz.pdfas.utils;

import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import at.gv.egiz.pdfas.exceptions.ErrorCode;
import at.knowcenter.wag.egov.egiz.exceptions.PDFDocumentException;

import com.lowagie.text.pdf.PdfReader;

/**
 * @author tknall
 */
public class PDFASUtils {
   
   private PDFASUtils() {
   }
   
   /**
    * Verifies that a document could be opened with full permissions. 
    * @param pdfReader The PdfReader
    * @throws PDFDocumentException Thrown if document has not been opened with full permissions.
    */
   public static void checkReaderPermissions(PdfReader pdfReader) throws PDFDocumentException {
      if (pdfReader.isEncrypted()) {
         throw new PDFDocumentException(ErrorCode.DOCUMENT_IS_PROTECTED, "Document is encrypted.");
      }
      if (!pdfReader.isOpenedWithFullPermissions()) {
         throw new PDFDocumentException(ErrorCode.DOCUMENT_IS_PROTECTED, "Document is protected.");
      }
   }

   public static boolean toFile(byte[] data, File file) throws IOException {
      return PDFASUtils.toFile(new ByteArrayInputStream(data), file);
   }

   public static boolean toFile(InputStream inputStream, File file) throws IOException {
      boolean result = false;
      BufferedOutputStream bufferedOutputStream = null;
      try {
         bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(file));
         ConfigUtils.writeInputStreamToOutputStream(inputStream, bufferedOutputStream);
      } finally {
         if (bufferedOutputStream != null) {
            try {
               bufferedOutputStream.close();
               result = true;
            } catch (IOException e) {
               result = false;
            }
         }
      }
      return result;
   }
   
}