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/*
 * Copyright 2011 Lincoln Baxter, III
 *
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.ocpsoft.rewrite.test;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.protocol.ExecutionContext;
import org.apache.http.protocol.HttpContext;
import org.ocpsoft.rewrite.exception.RewriteException;

/**
 * @author Lincoln Baxter, III
 *
 */
public class HttpAction
{
   private final HttpClient client;
   private final T request;
   private final HttpResponse response;
   private final HttpContext context;
   private final String baseUrl;
   private final String contextPath;
   private String responseContent;

   public HttpAction(final HttpClient client, final HttpContext context, final T request,
            final HttpResponse response, final String baseUrl, final String contextPath)
   {
      this.client = client;
      this.request = request;
      this.context = context;
      this.response = response;
      this.baseUrl = baseUrl;
      this.contextPath = contextPath;
   }

   /**
    * Return the current full URL.
    */
   public String getCurrentURL()
   {
      HttpUriRequest currentReq = (HttpUriRequest) context.getAttribute(
               ExecutionContext.HTTP_REQUEST);
      HttpHost currentHost = (HttpHost) context.getAttribute(
               ExecutionContext.HTTP_TARGET_HOST);
      String currentUrl = currentHost.toURI() + currentReq.getURI();

      if (currentUrl.startsWith(baseUrl))
      {
         currentUrl = currentUrl.substring(baseUrl.length());
      }

      return currentUrl;
   }

   /**
    * Return the current URL excluding host or context root.
    */
   public String getCurrentContextRelativeURL()
   {
      if (!getCurrentURL().startsWith(getContextPath()))
      {
         throw new IllegalStateException("Cannot get relative URL for address outside context root [" + getCurrentURL()
                  + "]");
      }
      return getCurrentURL().substring(getContextPath().length());
   }

   /**
    * Return the URL up to and including the host and port.
    */
   public String getHost()
   {
      HttpHost currentHost = (HttpHost) context.getAttribute(
               ExecutionContext.HTTP_TARGET_HOST);

      return currentHost.toURI();
   }

   public HttpClient getClient()
   {
      return client;
   }

   public T getRequest()
   {
      return request;
   }

   public HttpContext getContext()
   {
      return context;
   }

   public HttpResponse getResponse()
   {
      return response;
   }

   public String getContextPath()
   {
      return contextPath;
   }

   public List getResponseHeaderValues(final String name)
   {
      List result = new ArrayList();
      Header[] headers = getResponse().getHeaders(name);
      for (Header header : headers) {
         result.add(header.getValue());
      }
      return result;
   }

   public int getStatusCode()
   {
      return response.getStatusLine().getStatusCode();
   }

   public String getResponseContent()
   {
      if (responseContent == null)
      {
         try {
            HttpEntity entity = getResponse().getEntity();
            if (entity != null)
            {
               responseContent = toString(entity.getContent());
            }
         }
         catch (Exception e) {
            throw new RewriteException("Could not stringify response InputStream", e);
         }
      }
      return responseContent;
   }

   /**
    * Return a {@link String} containing the contents of the given {@link InputStream}
    */
   public static String toString(final InputStream stream)
   {
      StringBuilder out = new StringBuilder();
      try {
         final char[] buffer = new char[0x10000];
         Reader in = new InputStreamReader(stream, "UTF-8");
         int read;
         do {
            read = in.read(buffer, 0, buffer.length);
            if (read > 0) {
               out.append(buffer, 0, read);
            }
         }
         while (read >= 0);
      }
      catch (UnsupportedEncodingException e) {
         throw new RuntimeException(e);
      }
      catch (IOException e) {
         throw new RuntimeException(e);
      }
      return out.toString();
   }
}