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/*
 * Copyright (c) 2020 gematik GmbH
 * 
 * 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
 * 
 *    http://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.
 */

/*
 * I_Directory_Administration
 * REST Schnittstelle zur Pflege der Verzeichniseinträge. Über diese Schnittstelle können Verzeichniseinträge inklusive Zertifikaten erzeugt, aktualisiert und gelöscht werden. Die Administration von Fachdaten erfolgt über Schnittstelle I_Directory_Application_Maintenance und wird durch die Fachanwendungen durchgeführt. Lesender Zugriff auf die Fachdaten ist mit Operation getDirectoryEntries in vorliegender Schnittstelle möglich.
 *
 * The version of the OpenAPI document: 1.1.1
 *
 *
 * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
 * https://openapi-generator.tech
 * Do not edit the class manually.
 */


package de.gematik.ti.epa.vzd.client.invoker;

import java.io.IOException;
import okhttp3.MediaType;
import okhttp3.ResponseBody;
import okio.Buffer;
import okio.BufferedSource;
import okio.ForwardingSource;
import okio.Okio;
import okio.Source;

public class ProgressResponseBody extends ResponseBody {

  private final ResponseBody responseBody;
  private final ApiCallback callback;
  private BufferedSource bufferedSource;

  public ProgressResponseBody(ResponseBody responseBody, ApiCallback callback) {
    this.responseBody = responseBody;
    this.callback = callback;
  }

  @Override
  public MediaType contentType() {
    return responseBody.contentType();
  }

  @Override
  public long contentLength() {
    return responseBody.contentLength();
  }

  @Override
  public BufferedSource source() {
    if (bufferedSource == null) {
      bufferedSource = Okio.buffer(source(responseBody.source()));
    }
    return bufferedSource;
  }

  private Source source(Source source) {
    return new ForwardingSource(source) {
      long totalBytesRead = 0L;

      @Override
      public long read(Buffer sink, long byteCount) throws IOException {
        long bytesRead = super.read(sink, byteCount);
        // read() returns the number of bytes read, or -1 if this source is exhausted.
        totalBytesRead += bytesRead != -1 ? bytesRead : 0;
        callback.onDownloadProgress(totalBytesRead, responseBody.contentLength(), bytesRead == -1);
        return bytesRead;
      }
    };
  }
}