/*
 * MinIO Java SDK for Amazon S3 Compatible Cloud Storage, (C) 2017 MinIO, Inc.
 *
 * 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
 *
 * 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.
 */

import java.io.IOException;
import java.io.InputStream;
import me.tongfei.progressbar.ProgressBar;

public class ProgressStream extends InputStream {
 private InputStream in;
 private ProgressBar pb;

 /**
 * ProgressStream implements an extends InputStream while also writing out the read progress on
 * console. ProgressStream can be used as a direct replacement for any InputStream compatible
 * input.
 *
 * @param msg Custom message string.
 * @param stream InputStream to be wrapped.
 * @throws IOException For any exception generated by the InputStream.
 */
 public ProgressStream(String msg, InputStream stream) throws IOException {
 this(msg, (long) stream.available(), stream);
 }

 /**
 * ProgressStream implements an extends InputStream while also writing out the read progress on
 * console. ProgressStream can be used as a direct replacement for any InputStream compatible
 * input.
 *
 * @param msg Custom message string.
 * @param size Size of the progress bar.
 * @param stream InputStream to be wrapped.
 * @throws IOException For any exception generated by the InputStream.
 */
 public ProgressStream(String msg, long size, InputStream stream) throws IOException {
 super();

 // Allocate the reader.
 this.in = stream;

 // Initialize progress bar.
 this.pb = new ProgressBar(msg, size);
 }

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

 @Override
 public void close() throws IOException {
 this.in.close();
 return;
 }

 @Override
 public int read() throws IOException {
 this.pb.step();
 return this.in.read();
 }

 @Override
 public int read(byte[] toStore) throws IOException {
 int readBytes = this.in.read(toStore);
 this.pb.stepBy(readBytes); // Update progress bar.
 return readBytes;
 }

 @Override
 public int read(byte[] toStore, int off, int len) throws IOException {
 int readBytes = this.in.read(toStore, off, len);
 this.pb.stepBy(readBytes);
 return readBytes;
 }

 @Override
 public long skip(long n) throws IOException {
 this.pb.stepTo(n);
 return this.in.skip(n);
 }

 @Override
 public boolean markSupported() {
 return false;
 }
}