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/*
 * Segment Public API
 * The Segment Public API helps you manage your Segment Workspaces and its resources. You can use the API to perform CRUD (create, read, update, delete) operations at no extra charge. This includes working with resources such as Sources, Destinations, Warehouses, Tracking Plans, and the Segment Destinations and Sources Catalogs.  All CRUD endpoints in the API follow REST conventions and use standard HTTP methods. Different URL endpoints represent different resources in a Workspace.  See the next sections for more information on how to use the Segment Public API. 
 *
 * The version of the OpenAPI document: 32.0.3
 * Contact: [email protected]
 *
 * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
 * https://openapi-generator.tech
 * Do not edit the class manually.
 */


package com.segment.publicapi;

import okhttp3.MediaType;
import okhttp3.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 {

    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;
            }
        };
    }
}