WIP

Werkout_watch Watch App/Assets.xcassets/AccentColor.colorset/Contents.json

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+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Werkout_watch Watch App/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "platform" : "watchos",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Werkout_watch Watch App/Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Werkout_watch Watch App/ContentView.swift

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+//
+//  ContentView.swift
+//  Werkout_watch Watch App
+//
+//  Created by Trey Tartt on 6/22/23.
+//
+
+import SwiftUI
+
+struct ContentView: View {
+    let exercise = PreviewWorkout.parseEquipment()[2]
+    @StateObject var vm = WatchMainViewModel()
+    
+    var body: some View {
+        VStack {
+            if let model = vm.watchPackageModel {
+                Text(model.currentExerciseName)
+                
+                Text("\(model.currentTimeLeft )")
+            }
+                
+            if let heartValue = vm.heartValue {
+                HStack {
+                    Image(systemName: "heart.fill")
+                    Text("\(heartValue)")
+                }
+            }
+            Button(action: {
+                vm.nextExercise()
+            }, label: {
+                Image(systemName: "arrow.forward")
+                    .font(.title)
+                    .frame(maxWidth: .infinity, maxHeight: .infinity)
+            })
+        }
+        .padding()
+    }
+}
+
+struct ContentView_Previews: PreviewProvider {
+    static var previews: some View {
+        ContentView()
+    }
+}

Werkout_watch Watch App/Preview Content/Preview Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Werkout_watch Watch App/WatchMainViewModel.swift

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+//
+//  WatchMainViewMoel.swift
+//  Werkout_watch Watch App
+//
+//  Created by Trey Tartt on 6/22/23.
+//
+
+import Foundation
+import WatchConnectivity
+import SwiftUI
+import HealthKit
+
+class WatchMainViewModel:  NSObject, ObservableObject  {
+    var session: WCSession
+    @Published var watchPackageModel: WatchPackageModel?
+    @Published var heartValue: Int?
+    
+    let healthStore = HKHealthStore()
+    var hkWorkoutSession: HKWorkoutSession? {
+        didSet {
+            print("here")
+        }
+    }
+    var hkBuilder: HKLiveWorkoutBuilder?
+    
+    override init() {
+        session = WCSession.default
+        super.init()
+        
+        session.delegate = self
+        session.activate()
+        autorizeHealthKit()
+    }
+    
+    func autorizeHealthKit() {
+        let healthKitTypes: Set = [
+            HKObjectType.quantityType(forIdentifier: HKQuantityTypeIdentifier.heartRate)!,
+            HKObjectType.quantityType(forIdentifier: .activeEnergyBurned)!,
+            HKQuantityType.workoutType()
+        ]
+        healthStore.requestAuthorization(toShare: healthKitTypes, read: healthKitTypes) { (succ, error) in
+            if !succ {
+                fatalError("Error requesting authorization from health store: \(String(describing: error)))")
+            }
+        }
+    }
+    
+    private func startHeartRateQuery(quantityTypeIdentifier: HKQuantityTypeIdentifier) {
+        let devicePredicate = HKQuery.predicateForObjects(from: [HKDevice.local()])
+        let updateHandler: (HKAnchoredObjectQuery, [HKSample]?, [HKDeletedObject]?, HKQueryAnchor?, Error?) -> Void = {
+            query, samples, deletedObjects, queryAnchor, error in
+            guard let samples = samples as? [HKQuantitySample] else {
+                return
+            }
+        }
+        
+        let query = HKAnchoredObjectQuery(type: HKObjectType.quantityType(forIdentifier: quantityTypeIdentifier)!, predicate: devicePredicate, anchor: nil, limit: HKObjectQueryNoLimit, resultsHandler: updateHandler)
+        
+        query.updateHandler = updateHandler
+        healthStore.execute(query)
+    }
+    
+    func nextExercise() {
+        let nextExerciseAction = WatchActions.nextExercise
+        let data = try! JSONEncoder().encode(nextExerciseAction)
+        send(data)
+    }
+}
+
+extension WatchMainViewModel: WCSessionDelegate {
+    func session(_ session: WCSession, didReceiveMessageData messageData: Data) {
+        if let model = try? JSONDecoder().decode(WatchPackageModel.self, from: messageData) {
+            DispatchQueue.main.async {
+                if self.watchPackageModel?.workoutEndDate != nil {
+                    self.watchPackageModel = nil
+                    self.stopWorkout()
+                } else if self.watchPackageModel == nil {
+                    self.startWorkout()
+                }
+                self.watchPackageModel = model
+            }
+        }
+    }
+    
+    func session(_ session: WCSession, activationDidCompleteWith activationState: WCSessionActivationState, error: Error?) {
+        
+    }
+    
+    func send(_ data: Data) {
+        guard WCSession.default.activationState == .activated else {
+            return
+        }
+#if os(iOS)
+        guard WCSession.default.isWatchAppInstalled else {
+            return
+        }
+#else
+        guard WCSession.default.isCompanionAppInstalled else {
+            return
+        }
+#endif
+        WCSession.default.sendMessageData(data, replyHandler: nil)
+        { error in
+            print("Cannot send message: \(String(describing: error))")
+        }
+    }
+}
+
+extension WatchMainViewModel: HKWorkoutSessionDelegate, HKLiveWorkoutBuilderDelegate {
+    func initWorkout() {
+        let configuration = HKWorkoutConfiguration()
+        configuration.activityType = .functionalStrengthTraining
+        
+        do {
+            hkWorkoutSession = try HKWorkoutSession(healthStore: healthStore, configuration: configuration)
+            hkBuilder = hkWorkoutSession?.associatedWorkoutBuilder()
+        } catch {
+            fatalError("Unable to create the workout session!")
+        }
+        guard let hkWorkoutSession = hkWorkoutSession, let hkBuilder = hkBuilder else {
+            return
+        }
+        // Setup session and builder.
+        hkWorkoutSession.delegate = self
+        hkBuilder.delegate = self
+        
+        /// Set the workout builder's data source.
+        hkBuilder.dataSource = HKLiveWorkoutDataSource(healthStore: healthStore,
+                                                       workoutConfiguration: configuration)
+    }
+    
+    func startWorkout() {
+        // Initialize our workout
+        initWorkout()
+        
+        guard let hkWorkoutSession = hkWorkoutSession, let hkBuilder = hkBuilder else {
+            return
+        }
+        
+        // Start the workout session and begin data collection
+        hkWorkoutSession.startActivity(with: Date())
+        hkBuilder.beginCollection(withStart: Date()) { (succ, error) in
+            if !succ {
+                fatalError("Error beginning collection from builder: \(String(describing: error)))")
+            }
+        }
+    }
+    
+    func stopWorkout() {
+        guard let hkWorkoutSession = hkWorkoutSession, let hkBuilder = hkBuilder else {
+            return
+        }
+        
+        hkWorkoutSession.end()
+        hkBuilder.endCollection(withEnd: Date()) { (success, error) in
+            hkBuilder.finishWorkout { (workout, error) in
+                DispatchQueue.main.async() {
+                    self.hkWorkoutSession = nil
+                    self.hkBuilder = nil
+                }
+            }
+        }
+    }
+    
+    func workoutSession(_ workoutSession: HKWorkoutSession, didChangeTo toState: HKWorkoutSessionState, from fromState: HKWorkoutSessionState, date: Date) {
+        print("[workoutSession] Changed State: \(toState.rawValue)")
+    }
+    
+    func workoutSession(_ workoutSession: HKWorkoutSession, didFailWithError error: Error) {
+        print("[workoutSession] Encountered an error: \(error)")
+    }
+    
+    func workoutBuilder(_ workoutBuilder: HKLiveWorkoutBuilder, didCollectDataOf collectedTypes: Set<HKSampleType>) {
+        for type in collectedTypes {
+            guard let quantityType = type as? HKQuantityType else {
+                return
+            }
+            switch quantityType {
+            case HKQuantityType.quantityType(forIdentifier: .heartRate):
+                let statistics = workoutBuilder.statistics(for: quantityType)
+                let heartRateUnit = HKUnit.count().unitDivided(by: HKUnit.minute())
+                let value = statistics!.mostRecentQuantity()?.doubleValue(for: heartRateUnit)
+                heartValue = Int(Double(round(1 * value!) / 1))
+                print("[workoutBuilder] Heart Rate: \(String(describing: heartValue))")
+            default:
+                return
+            }
+        }
+    }
+    
+    func workoutBuilderDidCollectEvent(_ workoutBuilder: HKLiveWorkoutBuilder) {
+        guard let workoutEventType = workoutBuilder.workoutEvents.last?.type else { return }
+        print("[workoutBuilderDidCollectEvent] Workout Builder changed event: \(workoutEventType.rawValue)")
+    }
+}

Werkout_watch Watch App/Werkout_watch Watch App.entitlements

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.developer.healthkit</key>
+	<true/>
+	<key>com.apple.developer.healthkit.access</key>
+	<array/>
+</dict>
+</plist>

Werkout_watch Watch App/Werkout_watchApp.swift

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+//
+//  Werkout_watchApp.swift
+//  Werkout_watch Watch App
+//
+//  Created by Trey Tartt on 6/22/23.
+//
+
+import SwiftUI
+
+@main
+struct Werkout_watch_Watch_AppApp: App {    
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+        }
+    }
+}