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//
//  ========================================================================
//  Copyright (c) 1995-2013 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.http.gzip;

import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.util.Set;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;

import org.eclipse.jetty.util.StringUtil;

/*------------------------------------------------------------ */
/**
 */
public abstract class CompressedResponseWrapper extends HttpServletResponseWrapper
{
    
    public static final int DEFAULT_BUFFER_SIZE = 8192;
    public static final int DEFAULT_MIN_COMPRESS_SIZE = 256;
    
    private Set _mimeTypes;
    private int _bufferSize=DEFAULT_BUFFER_SIZE;
    private int _minCompressSize=DEFAULT_MIN_COMPRESS_SIZE;
    protected HttpServletRequest _request;

    private PrintWriter _writer;
    private AbstractCompressedStream _compressedStream;
    private String _etag;
    private long _contentLength=-1;
    private boolean _noCompression;

    /* ------------------------------------------------------------ */
    public CompressedResponseWrapper(HttpServletRequest request, HttpServletResponse response)
    {
        super(response);
        _request = request;
    }


    /* ------------------------------------------------------------ */
    public long getContentLength()
    {
        return _contentLength;
    }

    /* ------------------------------------------------------------ */
    public int getBufferSize()
    {
        return _bufferSize;
    }
    
    /* ------------------------------------------------------------ */
    public int getMinCompressSize()
    {
        return _minCompressSize;
    }
    
    /* ------------------------------------------------------------ */
    public String getETag()
    {
        return _etag;
    }

    /* ------------------------------------------------------------ */
    public HttpServletRequest getRequest()
    {
        return _request;
    }
    
    /* ------------------------------------------------------------ */
    /**
     * @see org.eclipse.jetty.http.gzip.CompressedResponseWrapper#setMimeTypes(java.util.Set)
     */
    public void setMimeTypes(Set mimeTypes)
    {
        _mimeTypes = mimeTypes;
    }

    /* ------------------------------------------------------------ */
    /**
     * @see org.eclipse.jetty.http.gzip.CompressedResponseWrapper#setBufferSize(int)
     */
    @Override
    public void setBufferSize(int bufferSize)
    {
        _bufferSize = bufferSize;
    }

    /* ------------------------------------------------------------ */
    /**
     * @see org.eclipse.jetty.http.gzip.CompressedResponseWrapper#setMinCompressSize(int)
     */
    public void setMinCompressSize(int minCompressSize)
    {
        _minCompressSize = minCompressSize;
    }

    /* ------------------------------------------------------------ */
    /**
     * @see org.eclipse.jetty.http.gzip.CompressedResponseWrapper#setContentType(java.lang.String)
     */
    @Override
    public void setContentType(String ct)
    {
        super.setContentType(ct);
    
        if (ct!=null)
        {
            int colon=ct.indexOf(";");
            if (colon>0)
                ct=ct.substring(0,colon);
        }
    
        if ((_compressedStream==null || _compressedStream.getOutputStream()==null) && 
            (_mimeTypes==null && ct!=null && ct.contains("gzip") ||
             _mimeTypes!=null && (ct==null||!_mimeTypes.contains(StringUtil.asciiToLowerCase(ct)))))
        {
            noCompression();
        }
    }

    /* ------------------------------------------------------------ */
    /**
     * @see org.eclipse.jetty.http.gzip.CompressedResponseWrapper#setStatus(int, java.lang.String)
     */
    @Override
    public void setStatus(int sc, String sm)
    {
        super.setStatus(sc,sm);
        if (sc<200 || sc==204 || sc==205 || sc>=300)
            noCompression();
    }

    /* ------------------------------------------------------------ */
    /**
     * @see org.eclipse.jetty.http.gzip.CompressedResponseWrapper#setStatus(int)
     */
    @Override
    public void setStatus(int sc)
    {
        super.setStatus(sc);
        if (sc<200 || sc==204 || sc==205 || sc>=300)
            noCompression();
    }

    /* ------------------------------------------------------------ */
    /**
     * @see org.eclipse.jetty.http.gzip.CompressedResponseWrapper#setContentLength(int)
     */
    @Override
    public void setContentLength(int length)
    {
        setContentLength((long)length);
    }
    
    /* ------------------------------------------------------------ */
    protected void setContentLength(long length)
    {
        _contentLength=length;
        if (_compressedStream!=null)
            _compressedStream.setContentLength();
        else if (_noCompression && _contentLength>=0)
        {
            HttpServletResponse response = (HttpServletResponse)getResponse();
            if(_contentLength