/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2017 Yegor Bugayenko
 *
 * 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 NON-INFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS 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.
 */
package org.takes.facets.auth.codecs;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import lombok.EqualsAndHashCode;
import org.takes.facets.auth.Identity;

/**
 * Gzip codec.
 *
 * <p>The class is immutable and thread-safe.
 *
 * @author Aleksey Kurochka (eg04lt3r@gmail.com)
 * @version $Id: 5862d2f16509378a890cb35dd6f4d2680c3a8769 $
 * @since 0.16
 */
@EqualsAndHashCode
public final class CcGzip implements Codec {

    /**
     * Original codec.
     */
    private final Codec origin;

    /**
     * Ctor.
     * @param codec Original
     */
    public CcGzip(final Codec codec) {
        this.origin = codec;
    }

    @Override
    public byte[] encode(final Identity identity) throws IOException {
        final ByteArrayOutputStream out = new ByteArrayOutputStream();
        final GZIPOutputStream gzip = new GZIPOutputStream(out);
        try {
            gzip.write(this.origin.encode(identity));
        } finally {
            gzip.close();
        }
        return out.toByteArray();
    }

    @Override
    public Identity decode(final byte[] bytes) throws IOException {
        final ByteArrayOutputStream out = new ByteArrayOutputStream();
        final InputStream gzip = new GZIPInputStream(
            new ByteArrayInputStream(bytes)
        );
        try {
            while (true) {
                final int data = gzip.read();
                if (data < 0) {
                    break;
                }
                out.write(data);
            }
        } finally {
            gzip.close();
        }
        return this.origin.decode(out.toByteArray());
    }
}