coach-ios/ios/App/App/LiveStore.swift

// LiveStore.swift
// Bus interne main-actor pour les samples de séance live. Alimenté par
// CoachLiveBridge (WCSession) et consommé par la vue SwiftUI native
// CoachLiveView (Liquid Glass iOS 26). Le bridge continue aussi à publier
// vers le JS pour la page web /live (fallback / debug).

import Foundation
import Combine

@MainActor
final class LiveStore: ObservableObject {
    static let shared = LiveStore()

    enum Status: Equatable {
        case waiting
        case live
        case lost
    }

    @Published var heartRate: Double = 0
    @Published var activeEnergyKcal: Double = 0
    @Published var distanceMeters: Double = 0
    @Published var elapsedSec: TimeInterval = 0
    @Published var activityType: String? = nil
    @Published var status: Status = .waiting
    @Published var lastSampleAt: Date? = nil
    @Published var isPaused: Bool = false

    private var watchdog: Timer?
    private let lostThreshold: TimeInterval = 8
    private let endAfterLost: TimeInterval = 60
    private var lostSince: Date?

    private init() {
        watchdog = Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { [weak self] _ in
            Task { @MainActor [weak self] in
                guard let self else { return }
                guard let ts = self.lastSampleAt else { return }
                // En pause, HealthKit cesse de collecter : l'absence de sample
                // est normale et ne doit ni afficher « connexion perdue », ni
                // finir par terminer la Live Activity.
                guard !self.isPaused else { return }
                let sinceLast = Date().timeIntervalSince(ts)
                if self.status == .live, sinceLast > self.lostThreshold {
                    // Transition live -> lost : signale à la Live Activity
                    // que la connexion est perdue (heartbeat off, statut orange).
                    self.status = .lost
                    self.lostSince = Date()
                    if #available(iOS 16.2, *) {
                        LiveActivityManager.shared.update(state: self.currentState(isLive: false))
                    }
                } else if self.status == .lost,
                          let lostAt = self.lostSince,
                          Date().timeIntervalSince(lostAt) > self.endAfterLost {
                    // Resté .lost trop longtemps : on termine l'activité.
                    if #available(iOS 16.2, *) {
                        LiveActivityManager.shared.end()
                    }
                    self.lostSince = nil
                }
            }
        }
    }

    /// Appelé depuis CoachLiveBridge à chaque sample reçu (WCSession).
    /// nonisolated : peut être appelé depuis n'importe quel thread (WCSession
    /// callbacks viennent hors main).
    nonisolated func ingest(_ sample: [String: Any]) {
        let hr   = sample["heartRate"]        as? Double
        let kcal = sample["activeEnergyKcal"] as? Double
        let dist = sample["distanceMeters"]   as? Double
        let elap = sample["elapsedSec"]       as? Double
        let act  = sample["activityType"]     as? String
        Task { @MainActor [weak self] in
            guard let self else { return }
            let wasNotLive = self.status != .live
            if let v = hr   { self.heartRate = v }
            if let v = kcal { self.activeEnergyKcal = v }
            if let v = dist { self.distanceMeters = v }
            if let v = elap { self.elapsedSec = v }
            if let v = act  { self.activityType = v }
            self.lastSampleAt = Date()
            self.status = .live
            self.lostSince = nil

            // Hook Live Activity / Dynamic Island (iOS 16.1+ uniquement,
            // l'app cible iOS 15 mais ActivityKit n'existe qu'à partir de 16.1)
            if #available(iOS 16.2, *) {
                let state = self.currentState(isLive: true)
                if wasNotLive {
                    LiveActivityManager.shared.start(
                        label: self.activityLabel ?? "Séance",
                        symbol: self.activitySymbol,
                        state: state
                    )
                } else {
                    LiveActivityManager.shared.update(state: state)
                }
            }
        }
    }

    /// Pause / reprise annoncée par la montre. Met à jour la Live Activity pour
    /// que son bouton bascule (Pause ↔ Reprendre).
    /// nonisolated : appelé depuis un callback WCSession, hors main.
    nonisolated func setPaused(_ paused: Bool) {
        Task { @MainActor [weak self] in
            guard let self else { return }
            self.isPaused = paused
            if #available(iOS 16.2, *) {
                LiveActivityManager.shared.update(state: self.currentState(isLive: self.status == .live))
            }
        }
    }

    /// Fin de séance annoncée par la montre (`liveEnded`). Termine la Live
    /// Activity tout de suite, sans attendre le watchdog — celui-ci repose sur
    /// un Timer du main runloop, qui ne tourne pas quand l'app iPhone est
    /// suspendue en arrière-plan (le cas normal pendant une séance).
    /// nonisolated : appelé depuis un callback WCSession, hors main.
    nonisolated func endLive() {
        Task { @MainActor [weak self] in
            guard let self else { return }
            self.status = .waiting
            self.lostSince = nil
            self.lastSampleAt = nil
            self.isPaused = false
            if #available(iOS 16.2, *) {
                LiveActivityManager.shared.end()
            }
        }
    }

    @available(iOS 16.2, *)
    private func currentState(isLive: Bool) -> CoachLiveActivityAttributes.ContentState {
        CoachLiveActivityAttributes.ContentState(
            heartRate: heartRate,
            activeEnergyKcal: activeEnergyKcal,
            distanceMeters: distanceMeters,
            elapsedSec: elapsedSec,
            isLive: isLive,
            isPaused: isPaused
        )
    }

    // MARK: - Formatted accessors (utilisés par CoachLiveView)

    var heartRateText: String { heartRate > 0 ? String(Int(heartRate.rounded())) : "—" }
    var kcalText: String      { activeEnergyKcal > 0 ? String(Int(activeEnergyKcal.rounded())) : "—" }
    var distanceKmText: String {
        distanceMeters > 0 ? String(format: "%.2f", distanceMeters / 1000) : "—"
    }
    var paceText: String {
        guard distanceMeters > 50, elapsedSec > 10 else { return "—" }
        let minPerKm = (elapsedSec / 60) / (distanceMeters / 1000)
        guard minPerKm > 2, minPerKm < 30 else { return "—" }
        let m = Int(minPerKm)
        let s = Int(((minPerKm - Double(m)) * 60).rounded())
        return "\(m):\(String(format: "%02d", s))"
    }
    var elapsedText: String {
        let sec = Int(elapsedSec)
        let h = sec / 3600
        let m = (sec % 3600) / 60
        let s = sec % 60
        if h > 0 { return "\(h)h\(String(format: "%02d", m))" }
        return "\(m):\(String(format: "%02d", s))"
    }
    var activityLabel: String? {
        switch activityType {
        case "running":  return "Course"
        case "cycling":  return "Vélo"
        case "walking":  return "Marche"
        case "hiking":   return "Rando"
        case "strength": return "Renfo"
        case "mobility": return "Mobilité"
        default: return nil
        }
    }
    /// SF Symbol pour l'activité (utilisé par la Live Activity).
    var activitySymbol: String {
        switch activityType {
        case "cycling":  return "bicycle"
        case "walking":  return "figure.walk"
        case "hiking":   return "figure.walk"
        case "strength": return "dumbbell.fill"
        case "mobility": return "figure.yoga"
        default:         return "figure.run"
        }
    }
}