package at.gv.egiz.simpleSigning.helper;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.font.PDFont;
import org.apache.pdfbox.pdmodel.font.PDType1Font;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import at.gv.egiz.simpleSigning.ErrorSignature;

public class PDFHelper {

	private static final Logger logger = LoggerFactory
			.getLogger(PDFHelper.class);

//	private static byte[] createPDFiText(String text) {
//		try {
//			Document document = new Document(PageSize.A4, 36, 72, 108, 180);
//			ByteArrayOutputStream baos = new ByteArrayOutputStream();
//	        PdfWriter.getInstance(document,baos);
//	        document.open();
//	        document.add(new Paragraph(text));
//	        System.out.println("Text is inserted into pdf file");
//	        document.close();
//	        baos.close();
//	        return baos.toByteArray();
//		} catch(Throwable e) {
//			logger.error("Failed to create PDF", e);
//		}
//		return null;
//	}
	
	private static byte[] createPDFPdfBox(String text) {

		try {		
			// Create a document and add a page to it
			PDDocument document = new PDDocument();
			PDPage page = new PDPage();
			document.addPage( page );

			// Create a new font object selecting one of the PDF base fonts
			PDFont font = PDType1Font.TIMES_BOLD;
	
			// Start a new content stream which will "hold" the to be created content
			PDPageContentStream contentStream = new PDPageContentStream(document, page);
	
			// Define a text content stream using the selected font, moving the cursor and drawing the text "Hello World"
			contentStream.beginText();
			contentStream.setFont( font, 12 );
			contentStream.newLineAtOffset(100, 700);
			contentStream.showText(text);
			contentStream.endText();
	
			// Make sure that the content stream is closed:
			contentStream.close();
		
			// Save the result into byte array
			ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
			document.save(byteArrayOutputStream);
			
			document.close();
	
			return byteArrayOutputStream.toByteArray();			
			
		} catch (Exception e) {
			logger.error("Failed to create PDF", e);		
			return null;
		}	
	}
	
	public static byte[] createPDFDocument(String text) {
		return createPDFPdfBox(text);
		
	}

	public static void toError(HttpServletRequest req,
			HttpServletResponse resp, String error, String cause)
			throws ServletException, IOException {
		req.setAttribute(ErrorSignature.PARAM_ERROR, error);
		req.setAttribute(ErrorSignature.PARAM_CAUSE, cause);
		req.getRequestDispatcher("Error").forward(req, resp);
	}

}