Add watchOS support

meterios-watch/views/ContentView.swift

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+//
+//  ContentView.swift
+//  meterios-watch
+//
+//  (c) 2025 Martin "maride" Dessauer
+//
+
+import SwiftUI
+
+struct ContentView: View {
+    private var wcMgr: WCManager
+    
+    @State private var drinks: Array<Drink> = []
+    
+    @State private var showUpdateError: Bool = false
+    @State private var updateError: String = ""
+    @State private var updateErrorCount: Int = 0
+    
+    init(_ wcMgr: WCManager) {
+        self.wcMgr = wcMgr
+    }
+    
+    // update performs a full update from the paired device, covering connection info (user ID and backend address) and list of drinks
+    func update() {
+        if updateErrorCount >= 3 {
+            showUpdateError = true
+            updateErrorCount = 0
+            return
+        }
+        
+        // Update drinks list from paired device
+        wcMgr.requestDrinksList(
+            replyHandler: { drinks in
+                // Drinks received from backend
+                self.drinks = drinks
+                showUpdateError = false
+            }, errorHandler: { error in
+                // Error receiving drinks
+                print("Error receiving drinks: \(error)")
+                updateError = error?.localizedDescription ?? "Unknown error"
+                updateErrorCount += 1
+                update()
+            }
+        )
+    }
+    
+    var body: some View {
+        ZStack {
+            if drinks.count > 0 {
+                NavigationView {
+                    List() {
+                        // Drinks
+                        Section("Drinks") {
+                            ForEach(drinks) { drink in
+                                NavigationLink(drink.name) {
+                                    DrinkDetailView(wcMgr: wcMgr, drink: drink)
+                                }
+                            }
+                        }
+                        
+                        // Controls
+                        Section {
+                            Button("Refresh") {
+                                drinks = []
+                                update()
+                            }
+                        }
+                    }
+                }
+            } else {
+                ProgressView()
+            }
+        }
+        .onAppear(perform: update)
+        // Alert to communicate an error in communication with the paired device
+        .alert("Connection Error", isPresented: $showUpdateError) {
+            Text(updateError).tint(.red).font(.footnote)
+            Button("Retry", systemImage: "arrow.clockwise", action: update)
+        }
+    }
+}

meterios-watch/views/DrinkDetailView.swift

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+//
+//  DrinkDetailView.swift
+//  meterios-watch
+//
+//  (c) 2025 Martin "maride" Dessauer
+//
+
+import SwiftUI
+
+struct DrinkDetailView: View {
+    private var wcMgr: WCManager
+    private var drink: Drink
+    
+    @State var shouldShowTransactionSheet = false
+    
+    @Environment(\.dismiss) private var dismiss
+        
+    init(wcMgr: WCManager, drink: Drink) {
+        self.wcMgr = wcMgr
+        self.drink = drink
+    }
+    
+    var body: some View {
+        VStack {
+            // Title
+            Text(drink.name).font(.title)
+            
+            // Basic info
+            HStack {
+                VStack {
+                    Text(String(format: "%img", drink.caffeine)).fontWeight(.bold)
+                    Text("Caffeine").fontWeight(Font.Weight.thin)
+                }
+                Divider()
+                VStack {
+                    Text(String(format: "%.2f€", drink.GetPrice())).fontWeight(.bold)
+                    Text("Price").fontWeight(Font.Weight.thin)
+                }
+            }
+            
+            // Pick button
+            Button(action: {
+                // Open the transaction sheet
+                shouldShowTransactionSheet = true
+            }) {
+                Text("Poison picked!")
+            }.tint(.green)
+        }
+        
+        // Transaction sheet
+        .sheet(isPresented: $shouldShowTransactionSheet) {
+            // Sheet dismissed - dismiss detail perspective as well.
+            dismiss()
+        } content: {
+            TransactionView(wcMgr: wcMgr, drinkID: drink.id).interactiveDismissDisabled()
+        }
+    }
+}

meterios-watch/views/TransactionView.swift

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+//
+//  TransactionView.swift
+//  meterios-watch
+//
+//  (c) 2025 Martin "maride" Dessauer
+//
+
+import SwiftUI
+
+struct TransactionView: View {
+    private var wcMgr: WCManager
+    private var drinkID: Int
+    
+    @State var statusLine = "Booking..."
+    
+    @Environment(\.dismiss) private var dismiss
+    
+    // If the backend reacts too fast (we hate that, huh?), the user is confused because of the short life of this view
+    // closeTimer takes care of that confusion and gives the user the good old 56k modem feeling.
+    @State var closeTimer: Timer?
+    @State var closeTimerReady: Bool = false
+    @State var backendBookTimer: Timer?
+    @State var backendTimerReady: Bool = false
+    
+    init(wcMgr: WCManager, drinkID: Int) {
+        self.wcMgr = wcMgr
+        self.drinkID = drinkID
+    }
+    
+    // maybeDismiss dismisses this view after the backend call(s) finished AND the timer(s) ran out
+    func maybeDismiss() {
+        if closeTimerReady && backendTimerReady {
+            dismiss()
+        }
+    }
+    
+    // Books the drinks handed over to this view
+    func book() {
+        // Try to book the drink(s)
+        wcMgr.bookDrink(drinkID: drinkID) { salut in
+            statusLine = salut
+            backendTimerReady = true
+            maybeDismiss()
+        } errorHandler: { error in
+            statusLine = error!.localizedDescription
+            print("Error booking drinks: \(error)")
+        }
+    }
+    
+    var body: some View {
+        // Green checkmark or progress indicator
+        VStack {
+            if backendTimerReady {
+                Image(systemName: "checkmark.circle.fill")
+                    .foregroundStyle(.green)
+            } else {
+                ProgressView()
+            }
+            
+            // Status line, on success with salute
+            Text(statusLine)
+                .font(.title)
+
+            // Let watch vibrate on success
+            if #available(watchOS 10.0, *) {
+                Text("")
+                    .opacity(0)
+                    .sensoryFeedback(.success, trigger: backendTimerReady)
+            }
+        }.onAppear(perform: {
+            closeTimer = Timer.scheduledTimer(withTimeInterval: 1.5, repeats: false) { timer in
+                closeTimerReady = true
+                maybeDismiss()
+            }
+            backendBookTimer = Timer.scheduledTimer(withTimeInterval: 0.5, repeats: false) { timer in
+                book()
+            }
+        })
+    }
+}