mycode/myApp/Keging/KegingWatch Watch App/WatchSync.swift

//
//  WatchSync.swift
//  KegingWatch Watch App
//
//  폰 연동 (워치 측) — 폰에서 세트 구성을 받고, 완주 기록을 폰으로 보낸다
//  (transferUserInfo는 폰이 안 닿아도 자동으로 큐에 쌓였다 전달됨)
//

import WatchConnectivity

final class WatchSync: NSObject, WCSessionDelegate {
    static let shared = WatchSync()

    private override init() { super.init() }

    func activate() {
        guard WCSession.isSupported() else { return }
        let session = WCSession.default
        session.delegate = self
        session.activate()
    }

    func sendRecord(_ record: SessionRecord) {
        guard WCSession.isSupported() else { return }
        guard let data = try? JSONEncoder().encode(record) else { return }
        WCSession.default.transferUserInfo(["record": data])
    }

    // MARK: WCSessionDelegate

    nonisolated func session(_ session: WCSession, activationDidCompleteWith activationState: WCSessionActivationState, error: Error?) {
        guard activationState == .activated else { return }
        applyConfig(from: session.receivedApplicationContext)
    }

    nonisolated func session(_ session: WCSession, didReceiveApplicationContext applicationContext: [String: Any]) {
        applyConfig(from: applicationContext)
    }

    private nonisolated func applyConfig(from context: [String: Any]) {
        guard let data = context["config"] as? Data,
              let config = try? JSONDecoder().decode(WorkoutConfig.self, from: data) else { return }
        Task { @MainActor in
            if SettingsStore.shared.config != config {
                SettingsStore.shared.config = config
            }
        }
    }
}