data.android.js

import Fitness, {
  DataReadRequest,
  FitnessOptions,
  DataType,
  TimeUnit
} from "react-native-google-fitness";
import { DATA_TYPES, ERRORS } from "./constants";

const typeMappings = {
  [DATA_TYPES.heartRateBpm]: DataType.TYPE_HEART_RATE_BPM
};

const Data = {
  Types: DATA_TYPES,

  authorize(dataTypes) {
    const options = new FitnessOptions.Builder();
    dataTypes.forEach(dt => options.addDataType(typeMappings[dt]));

    return Fitness.requestPermissions(options.build()).then(
      () => undefined,
      () => Promise.reject(new Error(ERRORS.failedInit))
    );
  },

  read(dataType, options) {
    const readRequest = new DataReadRequest.Builder()
      .read_dataType(typeMappings[dataType])
      .setTimeRange(+options.startDate, +options.endDate, TimeUnit.MILLISECONDS)
      .build();

    return Fitness.History.readData(readRequest).then(
      result =>
        result.dataSets.reduce((samples, dataset) => {
          samples.push(...dataset);
          return samples;
        }, []),
      () => Promise.reject(new Error(ERRORS.failedQuery))
    );
  }
};

export default Data;