package at.gv.egiz.pdfas.web.servlets;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.nio.file.attribute.DosFileAttributes;
import java.util.Iterator;
import java.util.List;

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

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import at.gv.egiz.pdfas.web.helper.PdfAsHelper;

/**
 * Servlet implementation class Sign
 */
public class SignServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

	private static final String UPLOAD_DIRECTORY = "upload";
	private static final int THRESHOLD_SIZE = 1024 * 1024 * 3; // 3MB
	private static final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB
	private static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB

	/**
	 * Default constructor.
	 */
	public SignServlet() {
		// TODO Auto-generated constructor stub
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
	 *      response)
	 */
	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		try {
			doParameters(request, response);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	protected void doParameters(HttpServletRequest request,
			HttpServletResponse response) throws Exception {
		// checks if the request actually contains upload file
		if (!ServletFileUpload.isMultipartContent(request)) {
			PrintWriter writer = response.getWriter();
			writer.println("Request does not contain upload data");
			writer.flush();
			return;
		}

		// configures upload settings
		DiskFileItemFactory factory = new DiskFileItemFactory();
		factory.setSizeThreshold(THRESHOLD_SIZE);
		factory.setRepository(new File(System.getProperty("java.io.tmpdir")));
		
		ServletFileUpload upload = new ServletFileUpload(factory);
		upload.setFileSizeMax(MAX_FILE_SIZE);
		upload.setSizeMax(MAX_REQUEST_SIZE);

		// constructs the directory path to store upload file
		String uploadPath = getServletContext().getRealPath("")
				+ File.separator + UPLOAD_DIRECTORY;
		// creates the directory if it does not exist
		File uploadDir = new File(uploadPath);
		if (!uploadDir.exists()) {
			uploadDir.mkdir();
		}

		List formItems = upload.parseRequest(request);
		byte[] filecontent = null;
		if(formItems.size() != 1) {
			// TODO: no file uploaded!
		} else {
			FileItem item = (FileItem) formItems.get(0);
			filecontent = item.get();
		}

		doSignature(request, response, filecontent);
	}

	protected void doSignature(HttpServletRequest request,
			HttpServletResponse response, byte[] pdfData) {
		try {
			// TODO: read Parameters ...
			PdfAsHelper.startSignature(request, response, pdfData);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}