import AppleHealthKit, {
  type HealthKitPermissions,
  HealthPermission as AppleHealthPermission,
} from 'react-native-health';
import type { Permission as AndroidHealthPermission } from 'react-native-health-connect';
import {
  HealthLinkPermissions,
  type HealthPermissions,
} from '../types/permissions';

export const genericToIosPermissions = (
  permissions: HealthPermissions
): HealthKitPermissions => {
  const readPermissions = permissions.read.reduce<AppleHealthPermission[]>(
    (acc, permission) => {
      if (Array.isArray(genericToIosMap[permission])) {
        acc.push(...(genericToIosMap[permission] as AppleHealthPermission[]));
      }
      if (genericToIosMap[permission]) {
        acc.push(genericToIosMap[permission] as AppleHealthPermission);
      }
      return acc;
    },
    []
  );

  const writePermissions = permissions.write.reduce<AppleHealthPermission[]>(
    (acc, permission) => {
      if (genericToIosMap[permission]) {
        acc.push(genericToIosMap[permission] as AppleHealthPermission);
      }
      return acc;
    },
    []
  );
  return {
    permissions: {
      read: readPermissions.flat(),
      write: writePermissions.flat(),
    },
  };
};

export const genericToAndroidPermissions = (
  permissions: HealthPermissions
): AndroidHealthPermission[] => {
  let androidPermissions: AndroidHealthPermission[] = [];
  permissions.read.forEach((permission) => {
    if (genericToAndroidMap[permission]) {
      androidPermissions.push({
        accessType: 'read',
        recordType: genericToAndroidMap[permission],
      });
    }
  });
  permissions.write.forEach((permission) => {
    if (genericToAndroidMap[permission]) {
      androidPermissions.push({
        accessType: 'write',
        recordType: genericToAndroidMap[permission],
      });
    }
  });
  return androidPermissions;
};

const genericToIosMap: { [key: string]: string | string[] } = {
  [HealthLinkPermissions.BloodGlucose]:
    AppleHealthKit.Constants.Permissions.BloodGlucose,
  [HealthLinkPermissions.Height]: AppleHealthKit.Constants.Permissions.Height,
  [HealthLinkPermissions.Weight]: AppleHealthKit.Constants.Permissions.Weight,
  [HealthLinkPermissions.HeartRate]:
    AppleHealthKit.Constants.Permissions.HeartRate,
  [HealthLinkPermissions.RestingHeartRate]:
    AppleHealthKit.Constants.Permissions.RestingHeartRate,
  [HealthLinkPermissions.BloodPressure]: [
    AppleHealthKit.Constants.Permissions.BloodPressureDiastolic,
    AppleHealthKit.Constants.Permissions.BloodPressureSystolic,
  ],
  [HealthLinkPermissions.OxygenSaturation]:
    AppleHealthKit.Constants.Permissions.OxygenSaturation,
  [HealthLinkPermissions.Steps]: AppleHealthKit.Constants.Permissions.Steps,
  [HealthLinkPermissions.ActiveEnergyBurned]:
    AppleHealthKit.Constants.Permissions.ActiveEnergyBurned,
  [HealthLinkPermissions.BasalEnergyBurned]:
    AppleHealthKit.Constants.Permissions.BasalEnergyBurned,
};

const genericToAndroidMap: {
  [key in HealthLinkPermissions]: AndroidHealthPermission['recordType'];
} = {
  [HealthLinkPermissions.BloodGlucose]: 'BloodGlucose',
  [HealthLinkPermissions.Height]: 'Height',
  [HealthLinkPermissions.Weight]: 'Weight',
  [HealthLinkPermissions.HeartRate]: 'HeartRate',
  [HealthLinkPermissions.RestingHeartRate]: 'RestingHeartRate',
  [HealthLinkPermissions.BloodPressure]: 'BloodPressure',
  [HealthLinkPermissions.OxygenSaturation]: 'OxygenSaturation',
  [HealthLinkPermissions.Steps]: 'Steps',
  [HealthLinkPermissions.ActiveEnergyBurned]: 'ActiveCaloriesBurned',
  [HealthLinkPermissions.BasalEnergyBurned]: 'BasalMetabolicRate',
};