import {
  haptikaHealthKit,
  type NativeHeartbeatSeriesSummary,
  type NativeHealthMetricSample,
} from 'react-native-haptika-ppg';

import type {HealthKitContext, HealthMetricSample} from './healthTypes';

const mapSample = (sample: NativeHealthMetricSample): HealthMetricSample => ({
  type: sample.type,
  value: sample.value,
  unit: sample.unit,
  startDate: sample.startDate,
  endDate: sample.endDate,
  sourceName: sample.sourceName ?? null,
  sourceBundleIdentifier: sample.sourceBundleIdentifier ?? null,
  deviceName: sample.deviceName ?? null,
});

export const healthKitService = {
  isAvailable(): boolean {
    return haptikaHealthKit.isAvailable();
  },

  requestReadAuthorization(): Promise<boolean> {
    return haptikaHealthKit.requestReadAuthorization();
  },

  async fetchContext(lookbackDays = 14): Promise<HealthKitContext> {
    const context = await haptikaHealthKit.fetchContext(lookbackDays);
    return {
      available: context.available,
      // The native field retains its generated ABI name, but represents only
      // HKAuthorizationRequestStatus.unnecessary — never proof of read access.
      authorizationRequestSettled: context.authorized,
      latestRestingHeartRate:
        context.latestRestingHeartRate === undefined
          ? null
          : mapSample(context.latestRestingHeartRate),
      latestHrvSdnn:
        context.latestHrvSdnn === undefined
          ? null
          : mapSample(context.latestHrvSdnn),
      recentHeartRateSamples: context.recentHeartRateSamples.map(mapSample),
      contextConfidence: context.contextConfidence,
      fetchedAt: context.fetchedAt,
    };
  },

  fetchLatestHeartbeatSeries(): Promise<
    NativeHeartbeatSeriesSummary | undefined
  > {
    return haptikaHealthKit.fetchLatestHeartbeatSeries();
  },
};