/*
    GNU GENERAL PUBLIC LICENSE
    Copyright (C) 2006 The Lobo Project

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public
    License as published by the Free Software Foundation; either
    verion 2 of the License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    General Public License for more details.

    You should have received a copy of the GNU General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Contact info: lobochief@users.sourceforge.net
 */
/*
 * Created on May 27, 2005
 */
package org.lobobrowser.request;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import javax.net.ssl.HostnameVerifier;

import org.eclipse.jdt.annotation.NonNull;
import org.lobobrowser.clientlet.ClientletException;
import org.lobobrowser.clientlet.ClientletRequest;
import org.lobobrowser.clientlet.ClientletResponse;
import org.lobobrowser.ua.ProgressType;
import org.lobobrowser.ua.RequestType;
import org.lobobrowser.ua.UserAgentContext;

/**
 * @author J. H. S.
 */
public class RedirectRequestHandler implements RequestHandler {
  private final RequestHandler origHandler;
  private final @NonNull URL latestRequestURL;

  @Override
  public UserAgentContext getContext() {
    return origHandler.getContext();
  }

  /**
   *
   */
  public RedirectRequestHandler(final RequestHandler origHandler, final HttpURLConnection origConnection) throws MalformedURLException {
    this.origHandler = origHandler;
    final String location = origConnection.getHeaderField("Location");
    final URL origURL = origConnection.getURL();
    if (location == null) {
      throw new IllegalArgumentException("No Location header in redirect response for " + origConnection.getURL());
    }
    final URL finalURL = org.lobobrowser.util.Urls.createURL(origURL, location);
    final String origHost = origURL.getHost();
    final String finalHost = finalURL.getHost();
    if (origHost.equals(finalHost)) {
      if (origURL.getProtocol().equalsIgnoreCase(finalURL.getProtocol())) {
        if (origURL.getPort() == finalURL.getPort()) {
          final String origPath = origURL.getFile();
          final String finalPath = finalURL.getFile();
          if (origPath.equals(finalPath)) {
            throw new IllegalArgumentException("Redirecting URL '" + origURL + "' and target URL '" + finalURL + "' are equal!");
          }
        }
      }
    }
    this.latestRequestURL = finalURL;
  }

  /*
   * (non-Javadoc)
   *
   * @see net.sourceforge.xamj.http.RequestHandler#getHostnameVerifier()
   */
  public HostnameVerifier getHostnameVerifier() {
    return this.origHandler.getHostnameVerifier();
  }

  /*
   * (non-Javadoc)
   *
   * @see net.sourceforge.xamj.http.RequestHandler#getLatestRequestMethod()
   */
  public String getLatestRequestMethod() {
    return "GET";
  }

  /*
   * (non-Javadoc)
   *
   * @see net.sourceforge.xamj.http.RequestHandler#getLatestRequestURL()
   */
  public @NonNull URL getLatestRequestURL() {
    return this.latestRequestURL;
  }

  /*
   * (non-Javadoc)
   *
   * @see net.sourceforge.xamj.http.RequestHandler#getRequest()
   */
  public ClientletRequest getRequest() {
    return this.origHandler.getRequest();
  }

  /*
   * (non-Javadoc)
   *
   * @see
   * net.sourceforge.xamj.http.RequestHandler#handleException(java.lang.Exception
   * )
   */
  public boolean handleException(final ClientletResponse response, final Throwable exception, final RequestType requestType)
      throws ClientletException {
    return this.origHandler.handleException(response, exception, requestType);
  }

  /*
   * (non-Javadoc)
   *
   * @see net.sourceforge.xamj.http.RequestHandler#handleProgress(java.net.URL,
   * int, int)
   */
  public void handleProgress(final ProgressType progressType, final @NonNull URL url, final String method, final int value, final int max) {
    this.origHandler.handleProgress(progressType, url, method, value, max);
  }

  /*
   * (non-Javadoc)
   *
   * @see
   * net.sourceforge.xamj.http.RequestHandler#processResponse(org.xamjwg.clientlet
   * .ClientletResponse)
   */
  public void processResponse(final ClientletResponse response) throws ClientletException, IOException {
    this.origHandler.processResponse(response);
  }

  private volatile boolean cancelled;

  public void cancel() {
    this.cancelled = true;
  }

  public boolean isCancelled() {
    return this.cancelled;
  }
}