package com.zulip.android.networking;

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;

/**
 * TODO: add description
 */

public class UploadProgressResponse extends ResponseBody {
    private final ResponseBody responseBody;
    private final ProgressListener progressListener;
    private BufferedSource bufferedSource;
    private int mNotificationId;

    public UploadProgressResponse(ResponseBody responseBody, ProgressListener progressListener,
                                  int notificationId) {
        this.responseBody = responseBody;
        this.progressListener = progressListener;
        this.mNotificationId = notificationId;
    }

    @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;
                progressListener.update(totalBytesRead, responseBody.contentLength(), bytesRead == -1, mNotificationId);
                return bytesRead;
            }
        };
    }

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

Add custom upload progress RequestBody.
Add custom upload progress RequestBody.
