Restore smart settings and sync watch favourites

FuelBoardWatch Watch App/ContentView.swift

@@ -280,6 +280,7 @@ private enum WatchFuelCache {
 }
 
 struct ContentView: View {
+    @Environment(\.scenePhase) private var scenePhase
     @State private var fuel: WatchFuelType = WatchFuelCache.loadSelectedFuel()
     @State private var refreshState: WatchRefreshState = .noData
     @State private var favourites: [WatchFavouriteEntry] = []
@@ -297,6 +298,14 @@ struct ContentView: View {
         }
         .tabViewStyle(.verticalPage)
         .onAppear(perform: reloadFromCache)
+        .onReceive(NotificationCenter.default.publisher(for: .fuelBoardWatchDataDidUpdate)) { _ in
+            reloadFromCache()
+        }
+        .onChange(of: scenePhase) { _, newPhase in
+            if newPhase == .active {
+                reloadFromCache()
+            }
+        }
     }
 
     @ViewBuilder
@@ -499,6 +508,7 @@ struct ContentView: View {
         refreshState = .checking
         let requestDate = Date()
         WatchFuelCache.requestRefresh(requestDate)
+        WatchSyncManager.shared.requestRefresh(at: requestDate)
         Task {
             for _ in 0..<12 {
                 try? await Task.sleep(for: .seconds(1))

FuelBoardWatch Watch App/FuelBoardWatchApp.swift

@@ -2,6 +2,10 @@ import SwiftUI
 
 @main
 struct FuelBoardWatchApp: App {
+    init() {
+        WatchSyncManager.shared.activate()
+    }
+
     var body: some Scene {
         WindowGroup {
             ContentView()

FuelBoardWatch Watch App/WatchSyncManager.swift

@@ -0,0 +1,84 @@
+import Foundation
+import WatchConnectivity
+
+extension Notification.Name {
+    static let fuelBoardWatchDataDidUpdate = Notification.Name("FuelBoardWatchDataDidUpdate")
+}
+
+final class WatchSyncManager: NSObject, WCSessionDelegate {
+    static let shared = WatchSyncManager()
+
+    private let suiteName = "group.com.apt.fuelboard"
+
+    private override init() {
+        super.init()
+    }
+
+    func activate() {
+        guard WCSession.isSupported() else { return }
+        let session = WCSession.default
+        if session.delegate !== self {
+            session.delegate = self
+        }
+        session.activate()
+    }
+
+    func requestRefresh(at date: Date = Date()) {
+        guard WCSession.isSupported() else { return }
+        let raw = String(date.timeIntervalSince1970)
+        let payload = ["fuelboard.watchRefreshRequest": raw]
+        let session = WCSession.default
+
+        if session.isReachable {
+            session.sendMessage(payload, replyHandler: nil, errorHandler: nil)
+        } else {
+            session.transferUserInfo(payload)
+        }
+    }
+
+    private func sharedDefaults() -> UserDefaults? {
+        UserDefaults(suiteName: suiteName)
+    }
+
+    private func storeSnapshot(_ payload: [String: Any]) {
+        guard let defaults = sharedDefaults() else { return }
+
+        if let favourites = payload["fuelboard.favourites"] as? Data {
+            defaults.set(favourites, forKey: "fuelboard.favourites")
+        }
+        if let fuel = payload["fuelboard.selectedFuel"] as? String {
+            defaults.set(fuel, forKey: "fuelboard.selectedFuel")
+        }
+        if let distanceUnit = payload["fuelboard.distanceUnit"] as? String {
+            defaults.set(distanceUnit, forKey: "fuelboard.distanceUnit")
+        }
+        if let priceStyle = payload["fuelboard.priceDisplayStyle"] as? String {
+            defaults.set(priceStyle, forKey: "fuelboard.priceDisplayStyle")
+        }
+        if let location = payload["fuelboard.lastLocation"] as? String {
+            defaults.set(location, forKey: "fuelboard.lastLocation")
+        }
+        if let lastRefresh = payload["fuelboard.lastRefresh"] as? String {
+            defaults.set(lastRefresh, forKey: "fuelboard.lastRefresh")
+        }
+        if let handled = payload["fuelboard.watchRefreshHandled"] as? String {
+            defaults.set(handled, forKey: "fuelboard.watchRefreshHandled")
+        }
+
+        NotificationCenter.default.post(name: .fuelBoardWatchDataDidUpdate, object: nil)
+    }
+
+    func session(_ session: WCSession, activationDidCompleteWith activationState: WCSessionActivationState, error: (any Error)?) {
+        if let error {
+            print("WATCH-SYNC activation failed: \(error.localizedDescription)")
+        }
+    }
+
+    func session(_ session: WCSession, didReceiveApplicationContext applicationContext: [String : Any]) {
+        storeSnapshot(applicationContext)
+    }
+
+    func session(_ session: WCSession, didReceiveUserInfo userInfo: [String : Any] = [:]) {
+        storeSnapshot(userInfo)
+    }
+}