/*
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at <http://www.mozilla.org/MPL/>.
 * 
 * Software distributed under the License is distributed on an "AS IS" basis, WITHOUT
 * WARRANTY OF ANY KIND, either express or implied. See the License for the specific
 * language governing rights and limitations under the License.
 * 
 * The Original Code is the Venice Web Communities System.
 * 
 * The Initial Developer of the Original Code is Eric J. Bowersox <erbo@silcom.com>,
 * for Silverwrist Design Studios.  Portions created by Eric J. Bowersox are
 * Copyright (C) 2001 Eric J. Bowersox/Silverwrist Design Studios.  All Rights Reserved.
 * 
 * Contributor(s): 
 */
package com.silverwrist.venice.servlets.format;

import java.util.*;
import java.io.Writer;
import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.*;
import com.silverwrist.util.StringUtil;

public class ConfirmBox implements ContentRender, ColorSelectors
{
  /*--------------------------------------------------------------------------------
   * Static data members
   *--------------------------------------------------------------------------------
   */

  private static final long TIMEOUT = 60000;  // 1 minute

  private static Random rng = null;

  /*--------------------------------------------------------------------------------
   * Attributes
   *--------------------------------------------------------------------------------
   */

  private int conf_num;
  private String title;
  private String message;
  private String confirm_url;
  private String deny_url;
  private Date created;

  /*--------------------------------------------------------------------------------
   * Constructor
   *--------------------------------------------------------------------------------
   */

  public ConfirmBox(HttpServletRequest request, String attr_name, String param_name, String title,
		    String message, String confirm_url, String deny_url)
  {
    if (rng==null)
    { // initialize the random number gnerator
      Date now = new Date();
      rng = new Random(now.getTime());

    } // end if

    // Fill in all the parameters except created.
    this.conf_num = rng.nextInt(0x1000000);
    this.title = title;
    this.message = message;
    this.confirm_url = confirm_url + "&" + param_name + "=" + this.conf_num;
    this.deny_url = deny_url;

    // Stash this object in the HTTP session.
    HttpSession session = request.getSession(true);
    session.setAttribute(attr_name,this);

    // Now start the timer ticking...
    this.created = new Date();

  } // end constructor

  /*--------------------------------------------------------------------------------
   * Internal operations
   *--------------------------------------------------------------------------------
   */

  protected boolean doConfirm(int test_num)
  {
    Date now = new Date();
    if ((now.getTime()-created.getTime())>TIMEOUT)
      return false;
    return (test_num==conf_num);

  } // end doConfirm

  /*--------------------------------------------------------------------------------
   * Implementations from interface VeniceContent
   *--------------------------------------------------------------------------------
   */

  public String getPageTitle(RenderData rdat)
  {
    return title;

  } // end getPageTitle

  /*--------------------------------------------------------------------------------
   * Implementations from interface ContentRender
   *--------------------------------------------------------------------------------
   */

  public void renderHere(Writer out, RenderData rdat) throws IOException
  {
    out.write("<P><TABLE ALIGN=CENTER WIDTH=\"70%\" BORDER=1 CELLPADDING=2 CELLSPACING=1>");
    out.write("<TR VALIGN=MIDDLE><TD ALIGN=CENTER BGCOLOR=\"" + rdat.getStdColor(CONFIRM_TITLE_BACKGROUND)
	      + "\">\n");
    out.write(rdat.getStdFontTag(CONFIRM_TITLE_FOREGROUND,3) + StringUtil.encodeHTML(title) + "</FONT>\n");
    out.write("</TD></TR><TR VALIGN=MIDDLE><TD ALIGN=CENTER>\n");
    out.write(rdat.getStdFontTag(CONTENT_FOREGROUND,3) + "<P>" + StringUtil.encodeHTML(message) + "<P>\n");
    out.write("<A HREF=\"" + rdat.getEncodedServletPath(confirm_url) + "\">");
    out.write("<IMG SRC=\"" + rdat.getFullImagePath("bn_yes.gif")
	      + "\" ALT=\"Yes\" WIDTH=80 HEIGHT=24 BORDER=0></A>&nbsp;&nbsp;\n");
    out.write("<A HREF=\"" + rdat.getEncodedServletPath(deny_url) + "\">");
    out.write("<IMG SRC=\"" + rdat.getFullImagePath("bn_no.gif")
	      + "\" ALT=\"No\" WIDTH=80 HEIGHT=24 BORDER=0></A>\n");
    out.write("</FONT></TD></TR></TABLE><P>\n");
    
  } // end renderHere

  /*--------------------------------------------------------------------------------
   * External static operations
   *--------------------------------------------------------------------------------
   */

  public static boolean isConfirmed(HttpServletRequest request, String attr_name, String param_name)
  {
    // First, get the ConfirmBox out of the session data
    HttpSession session = request.getSession(true);
    Object obj = session.getAttribute(attr_name);
    session.removeAttribute(attr_name);  // we can only get it out once!
    if ((obj==null) || !(obj instanceof ConfirmBox)) // this is not a valid ConfirmBox!
      return false;
    ConfirmBox cb = (ConfirmBox)obj;

    // Now get the confirmation number out of the URL parameters.
    String test_num_str = request.getParameter(param_name);
    if (test_num_str==null)
      return false;  // no confirmation!

    int test_num;
    try
    { // convert to an integer
      test_num = Integer.parseInt(test_num_str);

    } // end try
    catch (NumberFormatException nfe)
    { // if the confirmation number is bogus, we're h0sed
      return false;

    } // end catch

    return cb.doConfirm(test_num);

  } // end isConfirmed

} // end class ConfirmBox