/**
 * Copyright (C) 2011  JTalks.org Team
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.jtalks.jcommune.web.filters.wrapper;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.nio.charset.StandardCharsets;

/**
 * @author Mikhail Stryzhonok
 */
public class TaggedResponseWrapper extends HttpServletResponseWrapper {
    private ByteArrayPrintWriter output;

    public TaggedResponseWrapper(HttpServletResponse response) {
        super(response);
        output = new ByteArrayPrintWriter();
    }

    public byte[] getByteArray() {
        return output.toByteArray();
    }

    public void setByteArray(byte[] bytes) throws IOException {
        output.setBytes(bytes);
    }

    @Override
    public ServletOutputStream getOutputStream() throws IOException {
        return output.getStream();
    }

    @Override
    public PrintWriter getWriter() throws IOException {
        return output.getWriter();
    }

    public String toString() {
        return output.toString();
    }

    private static class ByteArrayPrintWriter {

        private ByteArrayOutputStream baos = new ByteArrayOutputStream();
        private PrintWriter pw = new PrintWriter(new OutputStreamWriter(baos, StandardCharsets.UTF_8));
        private ServletOutputStream sos = new ByteArrayServletStream(baos);

        public PrintWriter getWriter() {
            return pw;
        }

        public ServletOutputStream getStream() {
            return sos;
        }

        public byte[] toByteArray() {
            pw.flush();
            return baos.toByteArray();
        }

        public void setBytes(byte[] bytes) throws IOException {
            baos.reset();
            baos.write(bytes);
        }
    }

    private static class ByteArrayServletStream extends ServletOutputStream {
        private ByteArrayOutputStream baos;

        ByteArrayServletStream(ByteArrayOutputStream baos) {
            this.baos = baos;
        }

        public void write(int param) throws IOException {
            baos.write(param);
        }
    }

}