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/*-*- mode: Java; tab-width:8 -*-*/

package io.soluble.pjb.bridge.http;

/*
 * Copyright (C) 2003-2007 Jost Boekemeier
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Iterator;

import io.soluble.pjb.bridge.NotImplementedException;
import io.soluble.pjb.bridge.Util;

/**
 * A simple HTTP response implementation.
 *
 * @author jostb
 */
public class HttpResponse {

    private final HashMap headers;
    private OutputStream outputStream;

    private boolean headersWritten;

    /**
     * Create a new HTTP response with the given OutputStream
     *
     * @param outputStream The OutputStream.
     *                     /*
     */
    public HttpResponse(OutputStream outputStream) {
        this.headers = new HashMap();

        this.outputStream = new BufferedOutputStream(outputStream) {
            @Override
            public void write(byte buf[], int pos, int len) throws IOException {
                if (!headersWritten) {
                    headersWritten = true;
                    writeHeaders();
                }
                super.write(buf, pos, len);
            }
        };
    }

    /**
     * Set the response header
     *
     * @param string The header key
     * @param val    The header value.
     */
    public void setHeader(String string, String val) {
        headers.put(string, val);
    }

    /**
     * Returns the OutputStream of the response. setContentLength() must be called before.
     *
     * @return The OutputStream
     * @see HttpRequest#setContentLength(int)
     */
    public OutputStream getOutputStream() {
        return outputStream;
    }

    /**
     * Set the response status. Not implemented.
     *
     * @param code
     */
    public void setStatus(int code) {
        throw new NotImplementedException();
    }

    /**
     * Add a response header, in this implementation identical to setHeader
     *
     * @param string  The header
     * @param string2 The header value
     * @see HttpResponse#setHeader(String, String)
     */
    public void addHeader(String string, String string2) {
        setHeader(string, string2);
    }

    private final byte[] h1 = Util.toBytes("HTTP/1.0 200 OK\r\n");
    private final byte[] h2 = Util.toBytes("Host: localhost\r\nConnection: close\r\n");
    private final byte[] h4 = Util.toBytes(": ");

    private void writeHeaders() throws IOException {
        java.io.ByteArrayOutputStream out = new ByteArrayOutputStream();
        out.write(h1);
        out.write(h2);
        for (Iterator ii = headers.keySet().iterator(); ii.hasNext(); ) {
            Object key = ii.next();
            Object val = headers.get(key);
            out.write(Util.toBytes((String) key));
            out.write(h4);
            out.write(Util.toBytes((String) val));
            out.write(Util.RN);
        }
        out.write(Util.RN);
        out.writeTo(outputStream);
    }

    /**
     * Set the content length of the response. Sets the "Content-Length" header value.
     *
     * @param length The content length
     * @throws IOException
     * @see HttpResponse#getOutputStream()
     */
    public void setContentLength(int length) throws IOException {
        setHeader("Content-Length", String.valueOf(length));
    }

    /**
     * Close the response
     *
     * @throws IOException
     */
    public void close() throws IOException {
        try {
            if (outputStream != null) outputStream.close();
        } finally {
            outputStream = null;
        }
    }

    public void flushBuffer() throws IOException {
        if (outputStream != null) outputStream.flush();
    }
}