/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.commons.compress.compressors.brotli;

import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.compress.compressors.CompressorInputStream;
import org.apache.commons.compress.utils.InputStreamStatistics;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.input.BoundedInputStream;
import org.brotli.dec.BrotliInputStream;

/**
 * {@link CompressorInputStream} implementation to decode Brotli encoded stream. Library relies on <a href="https://github.com/google/brotli">Google brotli</a>
 *
 * @since 1.14
 */
public class BrotliCompressorInputStream extends CompressorInputStream implements InputStreamStatistics {

    private final BoundedInputStream countingInputStream;
    private final BrotliInputStream brotliInputStream;

    /**
     * Construct a new instance.
     *
     * @param inputStream underlying data source.
     * @throws IOException in case of corrupted data or source stream problems.
     */
    public BrotliCompressorInputStream(final InputStream inputStream) throws IOException {
        brotliInputStream = new BrotliInputStream(countingInputStream = BoundedInputStream.builder().setInputStream(inputStream).get());
    }

    @Override
    public int available() throws IOException {
        return brotliInputStream.available();
    }

    @Override
    public void close() throws IOException {
        brotliInputStream.close();
    }

    /**
     * @since 1.17
     */
    @Override
    public long getCompressedCount() {
        return countingInputStream.getCount();
    }

    @Override
    public synchronized void mark(final int readLimit) {
        brotliInputStream.mark(readLimit);
    }

    @Override
    public boolean markSupported() {
        return brotliInputStream.markSupported();
    }

    @Override
    public int read() throws IOException {
        final int ret = brotliInputStream.read();
        count(ret == -1 ? 0 : 1);
        return ret;
    }

    @Override
    public int read(final byte[] b) throws IOException {
        return brotliInputStream.read(b);
    }

    @Override
    public int read(final byte[] buf, final int off, final int len) throws IOException {
        final int ret = brotliInputStream.read(buf, off, len);
        count(ret);
        return ret;
    }

    @Override
    public synchronized void reset() throws IOException {
        brotliInputStream.reset();
    }

    @Override
    public long skip(final long n) throws IOException {
        return IOUtils.skip(brotliInputStream, n);
    }

    @Override
    public String toString() {
        return brotliInputStream.toString();
    }
}
