/*
 * ============================================================================
 *                 The Apache Software License, Version 1.1
 * ============================================================================
 *
 * Copyright (C) 2002 The Apache Software Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modifica-
 * tion, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of  source code must  retain the above copyright  notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. The end-user documentation included with the redistribution, if any, must
 *    include the following  acknowledgment: "This product includes software
 *    developed by SuperBonBon Industries (http://www.sbbi.net/)."
 *    Alternately, this acknowledgment may appear in the software itself, if
 *    and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "UPNPLib" and "SuperBonBon Industries" must not be
 *    used to endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    info@sbbi.net.
 *
 * 5. Products  derived from this software may not be called 
 *    "SuperBonBon Industries", nor may "SBBI" appear in their name, 
 *    without prior written permission of SuperBonBon Industries.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS  FOR A PARTICULAR  PURPOSE ARE  DISCLAIMED. IN NO EVENT SHALL THE
 * APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT,INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
 * DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software  consists of voluntary contributions made by many individuals
 * on behalf of SuperBonBon Industries. For more information on 
 * SuperBonBon Industries, please see <http://www.sbbi.net/>.
 */
package net.yacy.upnp;

import java.util.*;

/**
 * A class to parse an HTTP response message.
 * @author <a href="mailto:superbonbon@sbbi.net">SuperBonBon</a>
 * @version 1.0
 */

public class HttpResponse {
  
  private String header;
  private Map<String, String> fields;
  private String body;
  
  
  /**
   * Constructor of the response, will try to parse the raw response data
   * @param rawHttpResponse the raw response data
   * @throws IllegalArgumentException if some error occurs during parsing
   */
  protected HttpResponse( String rawHttpResponse ) throws IllegalArgumentException {
    if ( rawHttpResponse == null || rawHttpResponse.trim().length() == 0 ) {
      throw new IllegalArgumentException( "Empty HTTP response message" );
    }
    boolean bodyParsing = false;
    StringBuilder bodyParsed = new StringBuilder();
    fields = new HashMap<String, String>();
    String[] lines = rawHttpResponse.split( "\\r\\n" );
    this.header = lines[0].trim();
    
    for ( int i = 1; i < lines.length; i++ ) {
      
      String line = lines[i];
      if ( line.length() == 0 ) {
        // line break before body
        bodyParsing = true;
      } else if ( bodyParsing ) {
        // we parse the message body
        bodyParsed.append( line ).append( "\r\n" );
      } else {
        // we parse the header
        if ( line.length() > 0 ) {
          int delim = line.indexOf( ':' );
          if ( delim != -1 ) {
            String key = line.substring( 0, delim ).toUpperCase();
            String value = line.substring( delim + 1 ).trim();
            fields.put( key, value );
          } else {
            throw new IllegalArgumentException( "Invalid HTTP message header :" + line );
          }
        }
      }	
    }
    if ( bodyParsing ) {
      body = bodyParsed.toString();
    }
  }
  
  public String getHeader() {
    return header;
  }
  
  public String getBody() {
    return body;
  }
  
  public String getHTTPFieldElement( String fieldName, String elementName ) throws IllegalArgumentException {
    String fieldNameValue = getHTTPHeaderField( fieldName );
    if ( fieldName!= null ) {
      
      StringTokenizer tokenizer = new StringTokenizer( fieldNameValue.trim(), "," );
      while (tokenizer.countTokens() > 0) {
        String nextToken = tokenizer.nextToken().trim();
        if ( nextToken.startsWith( elementName ) ) {
          int index = nextToken.indexOf( "=" );
          if ( index != -1 ) {
            return nextToken.substring( index + 1 ).trim();
          }
        }
      }
    }
    throw new IllegalArgumentException( "HTTP element field " + elementName + " is not present" );
  }
  
  public String getHTTPHeaderField( String fieldName ) throws IllegalArgumentException {
    String field = fields.get( fieldName.toUpperCase() );
    if ( field == null ) {
      throw new IllegalArgumentException( "HTTP field " + fieldName + " is not present");
    }
    return field;
  }
  
  
}