//
// HealthKitMapping.swift
// Workouts (Shared)
//
// Copyright 2025 Rouslan Zenetl. All Rights Reserved.
//

import Foundation
import HealthKit

// Bridges the app's HealthKit-free domain types to HealthKit, and centralizes the
// authorization type sets so the watch (which records the session) and the phone
// (which writes an estimated workout when no watch ran) request consistent scopes.

extension WorkoutActivityType {
    /// The HealthKit activity type used to tag a saved workout, so it lands in the
    /// right Apple Health / Fitness category and credits the rings appropriately.
    var hkActivityType: HKWorkoutActivityType {
        switch self {
        case .traditionalStrength: .traditionalStrengthTraining
        case .functionalStrength: .functionalStrengthTraining
        case .hiit: .highIntensityIntervalTraining
        case .coreTraining: .coreTraining
        case .cardio: .mixedCardio
        case .cycling: .cycling
        }
    }
}

/// Σ sets×reps×weight across weighted logs — the app-native "how much work" number.
/// Computed in the stored weight unit (display-only units never change the value).
enum WorkoutVolume {
    static func total(_ logs: [WorkoutLogDocument]) -> Double {
        logs.reduce(0) { sum, log in
            guard LoadType(rawValue: log.loadType) == .weight else { return sum }
            return sum + Double(log.sets * log.reps * log.weight)
        }
    }
}

/// The HealthKit scopes each side requests. Kept here so the share/read sets stay in
/// sync with what the writers actually use.
enum WorkoutHealthAuthorization {
    /// Watch: records a live session (writes the workout + energy, reads HR/energy back).
    static let watchShare: Set<HKSampleType> = [
        .workoutType(),
        HKQuantityType(.activeEnergyBurned),
    ]
    static let watchRead: Set<HKObjectType> = [
        HKQuantityType(.heartRate),
        HKQuantityType(.activeEnergyBurned),
        HKCharacteristicType(.dateOfBirth),   // → max HR for zone tracking
    ]

    /// Phone: writes an estimated workout when no watch session ran; reads body
    /// measurements to size the calorie estimate (and HR to display watch data).
    static let phoneShare: Set<HKSampleType> = [
        .workoutType(),
        HKQuantityType(.activeEnergyBurned),
    ]
    static let phoneRead: Set<HKObjectType> = [
        HKQuantityType(.bodyMass),
        HKQuantityType(.heartRate),
        HKCharacteristicType(.dateOfBirth),
        HKCharacteristicType(.biologicalSex),
    ]
}