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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
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 * 
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 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
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package com.sun.grizzly.jruby;

import com.sun.grizzly.tcp.http11.Constants;
import com.sun.grizzly.tcp.http11.GrizzlyResponse;
import com.sun.grizzly.util.buf.MessageBytes;
import com.sun.grizzly.util.http.MimeHeaders;

import java.io.IOException;

class HttpHeaderParser {
    private final GrizzlyResponse response;
    private int pos;

    public HttpHeaderParser(GrizzlyResponse response) {
        this.response = response;
    }

    /**
     * Parses the HTTP headers from the given buf and add them to {@link com.sun.grizzly.util.http.MimeHeaders}.
     * @return current position in the buf, after \r\n 
     */
    public int parseHeaders(byte[] buf, int offset, int len) throws IOException {
        pos = offset;
        while (parseHeader(buf, len)) {
        }
        return pos;
    }


    private boolean parseHeader(final byte[] buf, final int len) throws IOException {
        String fieldName = null;
        String fieldValue;
        //
        // Check for blank line
        //
        if (pos >= len) return false;
        byte chr = 0;
        while (pos < len) {
            chr = buf[pos];

            if ((chr == Constants.CR) || (chr == Constants.LF)) {
                chr = buf[pos + 1];
                if (chr == Constants.LF) {
                    pos +=2;
                    return false;
                }
            } else {
                break;
            }

            pos++;

        }

        // Mark the current buffer position
        int start = pos;

        //
        // Reading the header name
        // Header name is always US-ASCII
        //

        boolean colon = false;

        while (!colon && pos < len) {

            if (buf[pos] == Constants.COLON) {
                colon = true;
                fieldName = new String(buf, start, pos - start).trim();
//                headerValue = headers.addValue(buf, start, pos - start);
            }
            chr = buf[pos];
            pos++;

        }


        //
        // Reading the header value (which can be spanned over multiple lines)
        //

        boolean eol = false;
        boolean validLine = true;

        boolean space = false;
        while (space && pos < len) {
            if ((buf[pos] == Constants.SP) || (buf[pos] == Constants.HT)) {
                pos++;
            } else {
                space = false;
            }

        }
        // Mark the current buffer position
        start = pos;
        
        int realPos = pos;
        while (validLine) {

//            space = true;
//            // Skipping spaces
//            while (space && pos < len) {
//                if ((buf[pos] == Constants.SP) || (buf[pos] == Constants.HT)) {
//                    pos++;
//                } else {
//                    space = false;
//                }
//
//            }

            int lastSignificantChar = realPos;
//             Reading bytes until the end of the line
            while (!eol && pos < len) {
               if (buf[pos] == Constants.CR) {
               } else if (buf[pos] == Constants.LF) {
                   eol = true;
               } else if (buf[pos] == Constants.SP) {
                   realPos++;
               } else {
                   realPos++;
//                   lastSignificantChar = realPos;
               }
               pos++;

           }

           //realPos = lastSignificantChar;

           // Checking the first character of the new line. If the character
           // is a LWS, then it's a multiline header
           // Read new bytes if needed
           chr = buf[pos];
           if ((chr != Constants.SP) && (chr != Constants.HT)) {
               validLine = false;
           } else {
               eol = false;
               realPos++;
           }
       }

       // Set the header value
//       if(headerValue != null)
//           headerValue.setBytes(buf, start, realPos - start);
        if(fieldName != null){
            fieldValue = new String(buf, start, realPos - start).trim();
            if(fieldName.equalsIgnoreCase("Content-Type")){
                response.setContentType(fieldValue);
            }else if(fieldName.equalsIgnoreCase("status")){
                int value = 200;
                String msg = "OK";
                if(fieldValue != null){
                    int index = fieldValue.indexOf(' ');
                    if(index != -1){
                        try{
                            value = Integer.valueOf(fieldValue.substring(0, index));
                        }catch(NumberFormatException e){
                            //ignore, defaults to 200
                        }
                        msg = fieldValue.substring(index, fieldValue.length()).trim();
                    }
                }

                response.setStatus(value, msg);
            }else if(fieldName.equalsIgnoreCase("Content-Length")){
                try{
                    response.setContentLength(Integer.valueOf(fieldValue));
                }catch(NumberFormatException e){
                    //let grizzly write the length from the response body
                }
            }else{
                response.addHeader(fieldName, fieldValue);
            }
        }
       return true;

    }
}