package com.roseindiaCaptcha.servlet;

import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import javax.servlet.http.*;
import javax.servlet.*;
import java.io.*;
import java.awt.*;
import java.util.*;
import java.awt.font.TextAttribute;

public class RoseIndiaCaptcha extends HttpServlet {

	/**
	 *
	 */
	private static final long serialVersionUID = 4683976762020108309L;
	private int height=0;
	private int width=0;

	public static final String CAPTCHA_KEY = "captcha_key_name";

  public void init(ServletConfig config) throws ServletException {
    super.init(config);
	 height=Integer.parseInt(getServletConfig().getInitParameter("height"));
     width=Integer.parseInt(getServletConfig().getInitParameter("width"));
  }


 protected void doGet(HttpServletRequest req, HttpServletResponse response) throws IOException, ServletException {
	  //Expire response
	  response.setHeader("Cache-Control", "no-cache");
	  response.setDateHeader("Expires", 0);
	  response.setHeader("Pragma", "no-cache");
	  response.setDateHeader("Max-Age", 0);

	  BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
	  Graphics2D graphics2D = image.createGraphics();
	  Hashtable<TextAttribute, Object> map = new Hashtable<TextAttribute, Object>();
	  Random r = new Random();
	  String token = Long.toString(Math.abs(r.nextLong()), 36);
	  String ch = token.substring(0,6);
	  Color c = new Color(0.6662f, 0.4569f, 0.3232f);
	  GradientPaint gp = new GradientPaint(30, 30, c, 15, 25, Color.white, true);
	  graphics2D.setPaint(gp);
	  Font font=new Font("Verdana", Font.CENTER_BASELINE , 26);
	  graphics2D.setFont(font);
	  graphics2D.drawString(ch,2,20);
	  graphics2D.dispose();

	  HttpSession session = req.getSession(true);
	  session.setAttribute(CAPTCHA_KEY,ch);

	  OutputStream outputStream = response.getOutputStream();
	  ImageIO.write(image, "jpeg", outputStream);
	  outputStream.close();



 }

}