/**
 * ****************************************************************************
 * Copyright 2013 EMBL-EBI
 * <p/>
 * Licensed 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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 htsjdk.samtools.cram.io;

import htsjdk.samtools.util.RuntimeIOException;

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

/**
 * An input stream that counts the bytes read from it.
 */
public class CountingInputStream extends InputStream {
    private final InputStream delegate;
    private long count = 0;

    public CountingInputStream(final InputStream inputStream) {
        delegate = inputStream;
    }

    @Override
    public int read() {
        count++;
        try {
            return delegate.read();
        } catch (final IOException e) {
            throw new RuntimeIOException(e);
        }
    }

    @Override
    public int read(@SuppressWarnings("NullableProblems") final byte[] b) {
        try {
            final int read = delegate.read(b);

            count += read;
            return read;
        } catch (final IOException e) {
            throw new RuntimeIOException(e);
        }
    }

    @Override
    public int read(@SuppressWarnings("NullableProblems") final byte[] b, final int off, final int length) {
        try {
            final int read = delegate.read(b, off, length);
            count += read;
            return read;
        } catch (final IOException e) {
            throw new RuntimeIOException(e);
        }
    }

    @Override
    public long skip(final long n) {
        try {
            final long skipped = delegate.skip(n);
            count += skipped;
            return skipped;
        } catch (final IOException e) {
            throw new RuntimeIOException(e);
        }
    }

    @Override
    public int available() {
        try {
            return delegate.available();
        } catch (final IOException e) {
            throw new RuntimeIOException(e);
        }
    }

    @Override
    public void close() {
        try {
            if (delegate != null) {
                delegate.close();
            }
        } catch (final IOException e) {
            throw new RuntimeIOException(e);
        }
    }

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

    @Override
    public void reset() {
        try {
            delegate.reset();
        } catch (final IOException e) {
            throw new RuntimeIOException(e);
        }
        count = 0;
    }

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

    public long getCount() {
        return count;
    }
}
