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A Kotlin Multiplatform library providing unified health data access across Apple HealthKit (iOS) and Health Connect (Android). Vitality offers comprehensive health metrics, real-time monitoring, workout management, and medical records support through FHIR standards.

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# Vitality

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A Kotlin Multiplatform library exposing Apple HealthKit (iOS) and Android Health Connect through one API. The common surface is the union of the two platforms' data types, mapped 1:1 to the native records with no additional abstraction; operations return `Result<T>` and real-time data is delivered as Kotlin Flows. Types one platform cannot serve fail with `UnsupportedFeature` rather than returning empty data.

## Installation

```kotlin
dependencies {
    implementation("io.github.crowded-libs:vitality:0.2.1")
}
```

Requirements:

- iOS 13.0+ with the HealthKit capability. Newer data types degrade gracefully: each is gated on the OS version that introduced it (14/16/17/18/26).
- Android API 26+ with Health Connect installed. Clinical records require Android 16 (API 35). Mindfulness and skin temperature depend on the installed Health Connect version and are checked at runtime.

## Platform setup

### Android

Initialize the context provider in your `Application` class and register the activity used for permission requests:

```kotlin
class MyApplication : Application() {
    override fun onCreate() {
        super.onCreate()
        HealthConnectorContextProvider.initialize(applicationContext)
    }
}

// In your Activity (before onCreate completes), either:
val connector = createHealthConnector(activity)
// or set HealthConnectorContextProvider.activity = this and use createHealthConnector().
// Call HealthConnectorContextProvider.clearActivity() from onDestroy().
```

Declare the Health Connect permissions your app uses in `AndroidManifest.xml`:

```xml
<uses-permission android:name="android.permission.health.READ_HEART_RATE" />
<uses-permission android:name="android.permission.health.WRITE_HEART_RATE" />

```

### iOS

Enable the HealthKit capability and add usage descriptions to `Info.plist`:

```xml
<key>NSHealthShareUsageDescription</key>
<string>This app reads your health data to provide insights</string>
<key>NSHealthUpdateUsageDescription</key>
<string>This app updates your health data from workouts</string>
```

Background delivery is iOS-only (no Health Connect equivalent). Cast to `HealthKitConnector`:

```kotlin
(connector as? HealthKitConnector)?.enableBackgroundDelivery(
    dataTypes = setOf(HealthDataType.HeartRate),
    updateFrequency = BackgroundDeliveryFrequency.IMMEDIATE
)
```

## Quick start

```kotlin
import vitality.*
import vitality.models.*
import kotlin.time.Clock
import kotlin.time.Duration.Companion.days

val connector = createHealthConnector()

suspend fun example() {
    connector.initialize().getOrThrow()

val permissions = setOf(
        HealthPermission(HealthDataType.HeartRate, HealthPermission.AccessType.READ),
        HealthPermission(HealthDataType.Steps, HealthPermission.AccessType.READ),
    )
    val grantResult = connector.requestPermissions(permissions).getOrThrow()
    println("granted=${grantResult.granted.size} denied=${grantResult.denied.size}")

val now = Clock.System.now()
    connector.readHealthData(HealthDataType.HeartRate, now - 1.days, now)
        .onSuccess { points ->
            points.filterIsInstance<HeartRateData>().forEach { println("${it.timestamp}: ${it.bpm} bpm") }
        }

connector.observe<HeartRateData>(HealthDataType.HeartRate).collect { println("live: ${it.bpm} bpm") }
}
```

Permission semantics:

- **Android:** granular per-record-type permissions; `checkPermissions` reflects actual grants.
- **iOS:** HealthKit reports write (share) authorization but never discloses read authorization. `requestPermissions` reports write denials accurately and sets `readPermissionsIndeterminate=true` in `platformSpecificInfo`; `checkPermissions` returns `NotDetermined` for read-only sets.

## Data type support

Column values are the native type backing each `HealthDataType`. "No" means the platform has no equivalent; reads fail with `UnsupportedFeature`.

### Fitness

| Vitality type | HealthKit (iOS) | Health Connect (Android) |
|---|---|---|
| `Steps` | `stepCount` | `StepsRecord` |
| `Distance` | `distanceWalkingRunning` | `DistanceRecord` |
| `Calories` | `activeEnergyBurned` | `TotalCaloriesBurnedRecord` |
| `ActiveCalories` | `activeEnergyBurned` | `ActiveCaloriesBurnedRecord` |
| `BasalCalories` | `basalEnergyBurned` (interval kcal) | `BasalMetabolicRateRecord` (kcal/day rate) |
| `Floors` | `flightsClimbed` | `FloorsClimbedRecord` |
| `Elevation` | No | `ElevationGainedRecord` |
| `Workout` | `HKWorkoutType` | `ExerciseSessionRecord` |
| `VO2Max` | `vo2Max` | `Vo2MaxRecord` |
| `WheelchairPushes` | No | `WheelchairPushesRecord` |
| `Speed` | `runningSpeed` (iOS 16+) | `SpeedRecord` |
| `CyclingCadence` | `cyclingCadence` (iOS 17+) | `CyclingPedalingCadenceRecord` |
| `Power` | `cyclingPower` (iOS 17+) | `PowerRecord` (any activity) |
| `CyclingFunctionalThresholdPower` | `cyclingFunctionalThresholdPower` (iOS 17+) | No |
| `RunningStrideLength` | `runningStrideLength` (iOS 16+) | No |
| `RunningVerticalOscillation` | `runningVerticalOscillation` (iOS 16+) | No |
| `RunningGroundContactTime` | `runningGroundContactTime` (iOS 16+) | No |
| `WorkoutEffortScore` | `workoutEffortScore` (iOS 18+) | No |
| `EstimatedWorkoutEffortScore` | `estimatedWorkoutEffortScore` (iOS 18+, read-only) | No |

**Energy:** `Calories`, `ActiveCalories`, and `BasalCalories` are distinct native types — not merged. On `CalorieData`, use `totalCalories` for Android totals, `activeCalories` for active energy, and `basalCalories` for basal. Android basal is a **kcal/day BMR rate** (`metadata["basalUnit"] = "kilocaloriesPerDay"`); iOS basal is **interval energy in kcal**. Do not add a BMR rate to active energy to invent a total.

### Vitals

| Vitality type | HealthKit (iOS) | Health Connect (Android) |
|---|---|---|
| `HeartRate` | `heartRate` | `HeartRateRecord` |
| `HeartRateVariability` | `heartRateVariabilitySDNN` (fills `sdnn`) | `HeartRateVariabilityRmssdRecord` (fills `rmssd`) |
| `RestingHeartRate` | `restingHeartRate` | `RestingHeartRateRecord` |
| `BloodPressure` | blood pressure correlation | `BloodPressureRecord` |
| `RespiratoryRate` | `respiratoryRate` | `RespiratoryRateRecord` |
| `OxygenSaturation` | `oxygenSaturation` | `OxygenSaturationRecord` |
| `BodyTemperature` | `bodyTemperature` | `BodyTemperatureRecord` |
| `WristTemperature` | `appleSleepingWristTemperature` (iOS 16+, read-only) | `SkinTemperatureRecord` (feature-gated) |
| `BloodGlucose` | `bloodGlucose` | `BloodGlucoseRecord` |
| `PeripheralPerfusionIndex` | `peripheralPerfusionIndex` | No |
| `IrregularHeartRhythmEvent` | `irregularHeartRhythmEvent` | No |
| `Electrocardiogram` | `HKElectrocardiogram` (iOS 14+) | No |

### Body measurements

| Vitality type | HealthKit (iOS) | Health Connect (Android) |
|---|---|---|
| `Weight` | `bodyMass` | `WeightRecord` |
| `Height` | `height` | `HeightRecord` |
| `BMI` | `bodyMassIndex` | No |
| `BodyFat` | `bodyFatPercentage` | `BodyFatRecord` |
| `LeanBodyMass` | `leanBodyMass` | `LeanBodyMassRecord` |

### Nutrition

| Vitality type | HealthKit (iOS) | Health Connect (Android) |
|---|---|---|
| `Water` | `dietaryWater` | `HydrationRecord` |
| `Protein` | `dietaryProtein` | `NutritionRecord.protein` |
| `Carbohydrates` | `dietaryCarbohydrates` | `NutritionRecord.totalCarbohydrate` |
| `Fat` | `dietaryFatTotal` | `NutritionRecord.totalFat` |
| `Fiber` | `dietaryFiber` | `NutritionRecord.dietaryFiber` |
| `Sugar` | `dietarySugar` | `NutritionRecord.sugar` |
| `Caffeine` | `dietaryCaffeine` | `NutritionRecord.caffeine` |

### Sleep and mindfulness

| Vitality type | HealthKit (iOS) | Health Connect (Android) |
|---|---|---|
| `Sleep` | `sleepAnalysis` | `SleepSessionRecord` (with stages) |
| `SleepApneaEvent` | `sleepApneaEvent` (iOS 18+) | No |
| `Mindfulness` | `mindfulSession` | `MindfulnessSessionRecord` (feature-gated) |
| `StateOfMind` | `HKStateOfMind` (iOS 18+, read + write) | No |

### Mobility (iOS 14+ only)

`WalkingAsymmetry`, `WalkingDoubleSupportPercentage`, `WalkingSpeed`, `WalkingStepLength`, `StairAscentSpeed`, `StairDescentSpeed`, `SixMinuteWalkTestDistance`, `NumberOfTimesFallen`, `StandHours` — HealthKit identifiers, read-only / device-generated. Not in Health Connect.

### Environmental (iOS only)

`EnvironmentalAudioExposure`, `HeadphoneAudioExposure`, `UVExposure`, `TimeInDaylight` (iOS 17+) — HealthKit identifiers. Not in Health Connect.

### Reproductive health

| Vitality type | HealthKit (iOS) | Health Connect (Android) |
|---|---|---|
| `MenstruationFlow` | `menstrualFlow` | `MenstruationFlowRecord` |
| `MenstruationPeriod` | No | `MenstruationPeriodRecord` |
| `IntermenstrualBleeding` | `intermenstrualBleeding` | `IntermenstrualBleedingRecord` |
| `CervicalMucus` | `cervicalMucusQuality` | `CervicalMucusRecord` |
| `OvulationTest` | `ovulationTestResult` | `OvulationTestRecord` |
| `SexualActivity` | `sexualActivity` | `SexualActivityRecord` |

### Clinical records (FHIR)

| Vitality type | HealthKit (iOS 12+) | Health Connect (Android 16+) |
|---|---|---|
| `ClinicalAllergies` | `allergyRecord` | `MedicalResource` (allergies/intolerances) |
| `ClinicalConditions` | `conditionRecord` | `MedicalResource` (conditions) |
| `ClinicalImmunizations` | `immunizationRecord` | `MedicalResource` (vaccines) |
| `ClinicalLabResults` | `labResultRecord` | `MedicalResource` (laboratory results) |
| `ClinicalMedications` | `medicationRecord` | `MedicalResource` (medications) |
| `ClinicalProcedures` | `procedureRecord` | `MedicalResource` (procedures) |
| `ClinicalVitalSigns` | `vitalSignRecord` | `MedicalResource` (vital signs) |

Methods: `readImmunizations`, `readMedications`, `readAllergies`, `readConditions`, `readLabResults`, `readProcedures`, `areClinicalRecordsAvailable`. Parsed types: `FHIRImmunization`, `FHIRMedicationStatement`, `FHIRMedicationRequest`, `FHIRAllergyIntolerance`, `FHIRCondition`, `FHIRObservation`, `FHIRProcedure`. iOS: `HKClinicalRecord` FHIR payloads. Android: Personal Health Record API (FHIR R4).

User-logged medications (iOS 26+, distinct from FHIR clinical meds): `readUserMedications`, `readMedicationDoseEvents`, `areUserMedicationsAvailable`. Elsewhere: `UnsupportedFeature`.

## Real-time monitoring

`observe(dataType, samplingInterval)` returns a Flow of typed model instances. Unsupported or OS-gated types fail with `UnsupportedFeature` (they do not complete empty).

- **iOS:** `HKObserverQuery` push; `samplingInterval` is ignored.
- **Android:** Health Connect Changes API — initial snapshot, then `getChanges(token)` every `samplingInterval` (default 30s). Each record once; token expiry re-baselines; transient failures retry with backoff; permission failures fail the flow.

```kotlin
connector.observe<HeartRateData>(HealthDataType.HeartRate)
    .collect { println("${it.timestamp}: ${it.bpm} bpm") }
```

## Workouts

```kotlin
val session = connector.startWorkoutSession(WorkoutType.RUNNING).getOrThrow()

launch { session.observeHeartRate().collect { println("HR: ${it.bpm}") } }
launch { session.observeDistance().collect { println("distance: ${it.distance} m") } }

session.pause()
session.resume()
session.end() // persists (Android records pauses as ExerciseSegments)
// or connector.discardWorkoutSession(session.id)
```

Read with `readWorkouts(start, end)`; write with `writeWorkout(workoutData)`. `WorkoutData.segments` mirrors Health Connect `ExerciseSegment` (Android-only; ignored on iOS write). Heart-rate min/avg/max on `WorkoutData` are summaries only — they are not expanded into sample series on write; write real samples via `writeHealthData`. Elevation is also a first-class type on Android (`HealthDataType.Elevation`).

## Statistics

`readStatistics` aggregates over a range. Without `bucketDuration`, use `values`; with it, use `buckets`.

```kotlin
val now = Clock.System.now()
val steps = connector.readStatistics(
    dataType = HealthDataType.Steps,
    startDate = now - 1.days,
    endDate = now,
    statisticOptions = setOf(StatisticOption.SUM)
).getOrThrow()
println("steps: ${steps.values[StatisticOption.SUM]}")
```

Options: `MINIMUM`, `MAXIMUM`, `AVERAGE`, `SUM`. Cumulative types support `SUM`; discrete types support min/max/average. Incompatible combinations fail with `InvalidDataException`.

## License

Apache License 2.0. See [LICENSE](LICENSE).

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