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package com.mapbox.mapboxsdk.telemetry;

import android.util.Log;
import java.io.IOException;
import okhttp3.Interceptor;
import okhttp3.MediaType;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
import okio.BufferedSink;
import okio.GzipSink;
import okio.Okio;

/**
 * OkHttp Interceptor for Gzipping Telemetry Data requests to the server.
 * Based on: https://github.com/square/okhttp/wiki/Interceptors
 */
public final class GzipRequestInterceptor implements Interceptor {

    private static final String TAG = "GzipRequestInterceptor";

    @Override public Response intercept(Interceptor.Chain chain) throws IOException {
        Request originalRequest = chain.request();
        if (originalRequest.body() == null || originalRequest.header("Content-Encoding") != null) {
            Log.d(TAG, "Not compressing");
            return chain.proceed(originalRequest);
        }

        Log.d(TAG, "Compressing");
        Request compressedRequest = originalRequest.newBuilder()
                .header("Content-Encoding", "gzip")
                .method(originalRequest.method(), gzip(originalRequest.body()))
                .build();
        return chain.proceed(compressedRequest);
    }

    private RequestBody gzip(final RequestBody body) {
        return new RequestBody() {
            @Override public MediaType contentType() {
                return body.contentType();
            }

            @Override public long contentLength() {
                return -1; // We don't know the compressed length in advance!
            }

            @Override public void writeTo(BufferedSink sink) throws IOException {
                BufferedSink gzipSink = Okio.buffer(new GzipSink(sink));
                body.writeTo(gzipSink);
                gzipSink.close();
            }
        };
    }
}