import HealthKit, { HKUnit, HKQuantityTypeIdentifier, HKInsulinDeliveryReason, HKCategoryTypeIdentifier } from '@kingstinct/react-native-healthkit';

  const isAvailable = await HealthKit.isHealthDataAvailable();

  /* Read latest sample of any data */
  await HealthKit.requestAuthorization([HKQuantityTypeIdentifier.bodyFatPercentage]); // request read permission for bodyFatPercentage

  const { quantity, unit, startDate, endDate } = await HealthKit.getMostRecentQuantitySample(HKQuantityTypeIdentifier.bodyFatPercentage); // read latest sample
  
  console.log(quantity) // 17.5
  console.log(unit) // %

  /* Listen to data */
  await HealthKit.requestAuthorization([HKQuantityTypeIdentifier.heartRate]); // request read permission for heart rate

  const unsubscribe = HealthKit.subscribeToChanges(HKQuantityTypeIdentifier.heartRate, () => {
    // refetch whichever queries you need
  });

  /* write data */
  await HealthKit.requestAuthorization([], [HKQuantityTypeIdentifier.insulinDelivery]); // request write permission for insulin delivery

  ReactNativeHealthkit.saveQuantitySample(
      HKQuantityTypeIdentifier.insulinDelivery,
      HKUnit.InternationalUnit,
      5.5,
      {
        metadata: {
          // Metadata keys could be arbirtary string to store app-specific data.
          // To use built-in types from https://developer.apple.com/documentation/healthkit/samples/metadata_keys
          // you need to specify string values instead of variable names (by dropping MetadataKey from the name).
          HKInsulinDeliveryReason: HKInsulinDeliveryReason.basal,
        },
      }
    );


  /* Hooks */
  const lastBodyFatSample = HealthKit.useMostRecentQuantitySample(HKQuantityTypeIdentifier.bodyFatPercentage);
  const lastMindfulSession = Healthkit.useMostRecentCategorySample(
    HKCategoryTypeIdentifier.mindfulSession
  );
  const lastWorkout = Healthkit.useMostRecentWorkout();