coach-ios/ios/App/CoachWatch/ConnectivityManager.swift

import Foundation
import WatchConnectivity
import WidgetKit
import os

private let connLog = Logger(subsystem: "ch.hypnotruck.coach.watchkitapp", category: "connectivity")

/// Envoie les samples de séance vers l'iPhone.
/// - `sendMessage` quand l'iPhone est joignable (temps réel)
/// - sinon buffer + `transferUserInfo` (livraison différée garantie)
final class ConnectivityManager: NSObject, ObservableObject {
    static let shared = ConnectivityManager()

    @Published private(set) var isReachable = false

    private let queue = DispatchQueue(label: "ch.hypnotruck.coach.connectivity")
    private var buffer: [[String: Any]] = []

    private override init() {
        super.init()
        guard WCSession.isSupported() else { return }
        let session = WCSession.default
        session.delegate = self
        session.activate()
    }

    func sendSample(_ payload: [String: Any]) {
        queue.async {
            let session = WCSession.default
            let hr = (payload["heartRate"] as? Double) ?? -1
            connLog.info("sendSample activated=\(session.activationState == .activated, privacy: .public) reachable=\(session.isReachable, privacy: .public) hr=\(hr, privacy: .public)")
            guard session.activationState == .activated else {
                self.buffer.append(payload)
                return
            }
            if session.isReachable {
                session.sendMessage(payload, replyHandler: nil) { [weak self] _ in
                    // échec d'envoi temps réel -> bascule en livraison différée
                    self?.queue.async {
                        self?.buffer.append(payload)
                        self?.flushLocked()
                    }
                }
            } else {
                self.buffer.append(payload)
                self.flushLocked()
            }
        }
    }

    /// Envoie l'état COMPLET de la routine du jour vers l'iPhone, qui le POSTe
    /// au serveur. Retourne `false` si rien n'a pu partir (l'appelant affiche
    /// alors un bouton « Renvoyer »).
    ///
    /// `sendMessage` quand l'iPhone est joignable, `transferUserInfo` sinon :
    /// la coche faite pendant une séance, iPhone resté à la maison, partira au
    /// prochain rapprochement.
    @discardableResult
    func sendRoutine(date: String, done: [String]) -> Bool {
        let session = WCSession.default
        guard session.activationState == .activated else { return false }
        let payload: [String: Any] = ["routineDone": done, "date": date]

        if session.isReachable {
            session.sendMessage(payload, replyHandler: nil) { _ in
                // Échec temps réel : bascule en livraison différée garantie.
                session.transferUserInfo(payload)
            }
        } else {
            session.transferUserInfo(payload)
        }
        connLog.info("routine envoyée à l'iPhone (\(done.count, privacy: .public) blocs)")
        return true
    }

    /// À appeler sur `queue` uniquement.
    private func flushLocked() {
        guard !buffer.isEmpty else { return }
        let session = WCSession.default
        guard session.activationState == .activated else { return }
        session.transferUserInfo(["samples": buffer])
        buffer.removeAll()
    }

    private func updateReachable(_ value: Bool) {
        DispatchQueue.main.async { [weak self] in self?.isReachable = value }
    }
}

extension ConnectivityManager: WCSessionDelegate {
    func session(_ session: WCSession,
                 activationDidCompleteWith activationState: WCSessionActivationState,
                 error: Error?) {
        updateReachable(session.isReachable)
        if activationState == .activated {
            queue.async { [weak self] in self?.flushLocked() }
        }
    }

    func sessionReachabilityDidChange(_ session: WCSession) {
        let reachable = session.isReachable
        updateReachable(reachable)
        if reachable {
            queue.async { [weak self] in self?.flushLocked() }
        }
    }

    // ─── Réception du snapshot widget (iPhone → Watch) ───
    // L'iPhone (CoachWidgetBridge) pousse les données du jour ; on les persiste
    // dans l'App Group de CETTE montre et on recharge les complications.

    func session(_ session: WCSession, didReceiveApplicationContext applicationContext: [String: Any]) {
        storeWidgetSnapshot(applicationContext)
        storeRoutineSnapshot(applicationContext)
    }

    func session(_ session: WCSession, didReceiveUserInfo userInfo: [String: Any] = [:]) {
        storeWidgetSnapshot(userInfo)
        storeRoutineSnapshot(userInfo)
    }

    /// Routine quotidienne poussée par l'iPhone (`CoachRoutineBridge`).
    /// Les blocs voyagent avec l'état : la montre n'a aucune liste codée en dur,
    /// modifier la routine côté web ne demande donc pas de rebuild watchOS.
    private func storeRoutineSnapshot(_ dict: [String: Any]) {
        guard let snapshot = dict["routineSnapshot"] as? [String: Any] else { return }
        Task { @MainActor in
            RoutineStore.shared.apply(snapshot: snapshot)
        }
    }

    private func storeWidgetSnapshot(_ dict: [String: Any]) {
        guard let data = dict["widgetSnapshot"] as? Data,
              let snapshot = try? JSONDecoder().decode(CoachWidgetSnapshot.self, from: data) else { return }
        CoachWidgetStore.save(snapshot)
        connLog.info("widgetSnapshot reçu de l'iPhone -> complications rechargées")
        DispatchQueue.main.async {
            WidgetCenter.shared.reloadAllTimelines()
        }
    }
}