Explore wellbeing APIs in HealthKit

5:37 - Request authorization to read and write State of Mind HealthKit samples

// Request authorization to read and write State of Mind HealthKit samples

import HealthKitUI

func healthDataAccessRequest(
    store: HKHealthStore, 
    shareTypes: Set<HKSampleType>,
    readTypes: Set<HKObjectType>? = nil,
    trigger: some Equatable,
    completion: @escaping (Result<Bool, any Error>) -> Void
) -> some View

6:26 - EmojiType

// EmojiType

enum EmojiType: CaseIterable {
    case angry
    case sad
    case indifferent
    case satisfied
    case happy
    
    var emoji: String {
        switch self {
        case .angry: return "😡"
        case .sad: return "😢"
        case .indifferent: return "😐"
        case .satisfied: return "😌"
        case .happy: return "😊"
        }
    }
  
}

6:32 - Create State of Mind sample for an event and emoji selection

/// Create State of Mind sample for an event and emoji selection

func createSample(for event: EventModel, emojiType: EmojiType) ->
HKStateOfMind {
    let kind: HKStateOfMind.Kind = .momentaryEmotion
    let valence: Double = emojiType.valence
    let label = emojiType.label
    let association = event.association
    return HKStateOfMind(date: event.endDate,
                         kind: kind,
                         valence: valence,
                         labels: [label],
                         associations: [association])
｝

7:21 - Save State of Mind sample from emoji choice

// Save State of Mind sample from emoji choice

func save(sample: HKSample, healthStore: HKHealthStore) async {
    do {
        try await healthStore.save(sample)
    ｝
    catch {
        // Handle error here.
    }
｝

10:34 - Query State of Mind samples

// Query State of Mind samples

let datePredicate: NSPredicate = { ... }
let associationsPredicate = NSCompoundPredicate (
    orPredicateWithSubpredicates: associations.map {
        HKQuery.predicateForStatesOfMind(with: $0)
    }
)  
let compoundPredicate = NSCompoundPredicate(
    andPredicateWithSubpredicates: [datePredicate, associationsPredicate]
)
let state0fMindPredicate = HKSamplePredicate.stateOfMind(compoundPredicate)

10:49 - Query State of Mind samples

// Query State of Mind samples

let datePredicate: NSPredicate = { ... }
let associationsPredicate = NSCompoundPredicate (
    orPredicateWithSubpredicates: associations.map {
        HKQuery.predicateForStatesOfMind(with: $0)
    }
)  
let compoundPredicate = NSCompoundPredicate(
    andPredicateWithSubpredicates: [datePredicate, associationsPredicate]
)
let stateOfMindPredicate = HKSamplePredicate.stateOfMind(compoundPredicate)

let descriptor = HKSampleQueryDescriptor(predicates: [stateOfMindPredicate],
                                         sortDescriptors: [])
var results: [HKStateOfMind] = []
do {
    // Launch the query and wait for the results.
    results = try await descriptor.result(for: healthStore)
} catch {
    // Handle error here.
｝

10:54 - Query State of Mind samples (continued)

// Adjust each valence value to be from a range of 0.0 to 2.0.
let adjustedValenceResults = results.map { $0.valence + 1.0 }
// Calculate average valence.
let totalAdjustedValence = adjustedValenceResults.reduce (0.0, +)
let averageAdjustedValence = totalAdjustedValence / Double(results.count)
// Convert valence to percentage.
let adjustedValenceAsPercent = Int(100.0 * (averageAdjustedValence / 2.0))

11:33 - Query for relevant State of Mind samples with a specific label

// Query for relevant State of Mind samples with a specific label
let label: HKStateOfMind.Label = .happy

// Configure the query
let datePredicate = HKQuery.predicateForSamples(withStart: dateInterval.start,
                                                end: dateInterval.end)
let associationPredicate = HKQuery.predicateForStatesOfMind(with: association)
let labelPredicate = HKQuery.predicateForStates0fMind(with: label)
let compoundPredicate = NSCompoundPredicate(
    andPredicateWithSubpredicates: [datePredicate, associationPredicate, labelPredicate]
)
let stateOfMindPredicate = HKSamplePredicate.stateOfMind(compoundPredicate)
let descriptor = HKAnchoredObjectQueryDescriptor(predicates: [state0fMindPredicate],
                                                 anchor: nil)

// Fetch the results
let results = descriptor.results(for: healthStore)
let samples: [HKStateOfMind] = try await results.reduce([]) { $1.addedSamples }

11:45 - Process State of Mind sample data

// Process State of Mind sample data

let happiestSample = samples.max { $0.valence < $1. valence }
let happiestEvent: EventModel? = findClosestEvent(startDate: happiestSample?.startDate,
                                                  endDate: happiestSample?.endDate)