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/*
 * Selling Partner API for Tokens 
 * The Selling Partner API for Tokens provides a secure way to access a customer's PII (Personally Identifiable Information). You can call the Tokens API to get a Restricted Data Token (RDT) for one or more restricted resources that you specify. The RDT authorizes subsequent calls to restricted operations that correspond to the restricted resources that you specified.  For more information, see the [Tokens API Use Case Guide](doc:tokens-api-use-case-guide).
 *
 * OpenAPI spec version: 2021-03-01
 * 
 *
 * NOTE: This class is auto generated by the swagger code generator program.
 * https://github.com/swagger-api/swagger-codegen.git
 * Do not edit the class manually.
 */


package io.swagger.client;

import com.squareup.okhttp.MediaType;
import com.squareup.okhttp.ResponseBody;

import java.io.IOException;

import okio.Buffer;
import okio.BufferedSource;
import okio.ForwardingSource;
import okio.Okio;
import okio.Source;

public class ProgressResponseBody extends ResponseBody {

    public interface ProgressListener {
        void update(long bytesRead, long contentLength, boolean done);
    }

    private final ResponseBody responseBody;
    private final ProgressListener progressListener;
    private BufferedSource bufferedSource;

    public ProgressResponseBody(ResponseBody responseBody, ProgressListener progressListener) {
        this.responseBody = responseBody;
        this.progressListener = progressListener;
    }

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

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

    @Override
    public BufferedSource source() throws IOException {
        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;
                progressListener.update(totalBytesRead, responseBody.contentLength(), bytesRead == -1);
                return bytesRead;
            }
        };
    }
}