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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2011, Red Hat, Inc., and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.ocpsoft.rewrite.prettyfaces;

import org.ocpsoft.rewrite.config.Rule;
import org.ocpsoft.rewrite.context.EvaluationContext;
import org.ocpsoft.rewrite.event.Rewrite;
import org.ocpsoft.rewrite.servlet.http.event.HttpInboundServletRewrite;
import org.ocpsoft.rewrite.servlet.http.event.HttpServletRewrite;
import org.ocpsoft.rewrite.servlet.util.URLBuilder;

import com.ocpsoft.pretty.faces.config.rewrite.Redirect;
import com.ocpsoft.pretty.faces.config.rewrite.RewriteRule;
import com.ocpsoft.pretty.faces.rewrite.RewriteEngine;
import com.ocpsoft.pretty.faces.url.QueryString;
import com.ocpsoft.pretty.faces.url.URL;
import com.ocpsoft.pretty.faces.util.StringUtils;

/**
 * @author Lincoln Baxter, III
 *
 */
public class InboundRewriteRuleAdaptor implements Rule
{
   private final RewriteRule rule;

   public InboundRewriteRuleAdaptor(final RewriteRule rule)
   {
      this.rule = rule;
   }

   @Override
   public String getId()
   {
      return toString();
   }

   @Override
   public boolean evaluate(final Rewrite event, final EvaluationContext context)
   {
      if (event instanceof HttpInboundServletRewrite && rule.isInbound() && PFUtil.isRewritingEnabled(event))
      {
         HttpServletRewrite httpRewrite = (HttpServletRewrite) event;
         String path = httpRewrite.getInboundAddress().getPath();

         String url = URL.build(path).decode().toURL()
                  + QueryString.build(httpRewrite.getInboundAddress().getQuery()).toQueryString();

         if (url.startsWith(httpRewrite.getContextPath()))
            url = url.substring(httpRewrite.getContextPath().length());

         if (rule.matches(url))
         {
            return true;
         }
      }
      return false;
   }

   @Override
   public void perform(final Rewrite event, final EvaluationContext context)
   {
      RewriteEngine engine = new RewriteEngine();
      HttpServletRewrite httpRewrite = (HttpServletRewrite) event;
      String originalUrl = httpRewrite.getInboundAddress().getPath();

      originalUrl = URL.build(originalUrl).decode().toURL()
               + QueryString.build(httpRewrite.getInboundAddress().getQuery()).toQueryString();

      if (originalUrl.startsWith(((HttpServletRewrite) event).getContextPath()))
         originalUrl = originalUrl.substring(((HttpServletRewrite) event).getContextPath().length());

      String newUrl = engine.processInbound(((HttpServletRewrite) event).getRequest(),
               ((HttpServletRewrite) event).getResponse(), rule, originalUrl);

      if (!Redirect.CHAIN.equals(rule.getRedirect()))
      {
         /*
          * An HTTP redirect has been triggered; issue one if we have a URL or if the current URL has been
          * modified.
          */

         String redirectURL = null;

         /*
          * The rewrite changed the URL and no 'url' attribute has been set for the rule.
          */
         if (StringUtils.isBlank(rule.getUrl()) && !originalUrl.equals(newUrl))
         {

            /*
             * Add context path and encode request using encodeRedirectURL().
             */
            redirectURL = ((HttpServletRewrite) event).getContextPath() + newUrl;
         }
         else if (StringUtils.isNotBlank(rule.getUrl()))
         {
            /*
             * This is a custom location - don't call encodeRedirectURL() and don't add context path, just
             * redirect to the encoded URL
             */
            redirectURL = newUrl.trim();
         }


         if (redirectURL != null)
         {
            URLBuilder encodedRedirectUrl = URLBuilder.createFrom(redirectURL).encode();
            redirectURL = encodedRedirectUrl.toString();
            if (Redirect.PERMANENT.equals(rule.getRedirect()))
               ((HttpInboundServletRewrite) event).redirectPermanent(redirectURL);
            if (Redirect.TEMPORARY.equals(rule.getRedirect()))
               ((HttpInboundServletRewrite) event).redirectTemporary(redirectURL);
         }
      }
      else if (!originalUrl.equals(newUrl))
      {
         PFUtil.setRewriteOccurred(event);
         ((HttpInboundServletRewrite) event).forward(newUrl);
      }
   }

   @Override
   public String toString()
   {
      return "InboundRewriteRuleAdaptor [rule=" + rule + "]";
   }
}