/*
 * WSO2 API Manager - Gateway
 * This document specifies a **RESTful API** for WSO2 **API Manager** - Gateway. Please see [full swagger definition](https://raw.githubusercontent.com/wso2/carbon-apimgt/v6.5.176/components/apimgt/org.wso2.carbon.apimgt.rest.api.admin/src/main/resources/admin-api.yaml) of the API which is written using [swagger 2.0](http://swagger.io/) specification. 
 *
 * OpenAPI spec version: v2
 * Contact: architecture@wso2.com
 *
 * 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 org.wso2.am.integration.clients.gateway.api;

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;
            }
        };
    }
}


