starting pose detection

app/src/main/java/com/example/jnicpp/bowling/CameraViewModel.kt

@@ -82,6 +82,19 @@ class CameraViewModel : ViewModel() {
     // several practice approaches back to back.
     private val liveStepDetector = LiveStepDetector()
 
+    // Live delivery-phase classification (starting stance, approach, etc)
+    private val posePhaseDetector = PosePhaseDetector()
+    private val _posePhase = MutableStateFlow<BowlingPhase?>(null)
+    //The bowler's current delivery phase, or null if no phase currently validates.
+    val posePhase: StateFlow<BowlingPhase?> = _posePhase.asStateFlow()
+
+    // Raw torso/knee/elbow angle readings behind posePhase above, for
+    // showing the bowler the actual numbers rather than just a pass/fail
+    // signal -- see PosePhaseDetector.Metrics.
+    private val _poseMetrics = MutableStateFlow<PosePhaseDetector.Metrics?>(null)
+    //This frame's torso/knee/elbow angle readings, or null if pose detection is off.
+    val poseMetrics: StateFlow<PosePhaseDetector.Metrics?> = _poseMetrics.asStateFlow()
+
     // Steps detected so far in the current attempt (since the last reset,
     // whether that reset was a new recording starting or the bowler
     // returning to a stationary stance mid-recording -- see
@@ -119,7 +132,12 @@ class CameraViewModel : ViewModel() {
      */
     fun onPoseToggled(enabled: Boolean) {
         _poseEnabled.value = enabled
-        if (!enabled) _poseAngles.value = null
+        if (!enabled) {
+            _poseAngles.value = null
+            posePhaseDetector.reset()
+            _posePhase.value = null
+            _poseMetrics.value = null
+        }
     }
 
     /**
@@ -135,6 +153,9 @@ class CameraViewModel : ViewModel() {
      */
     fun onPoseFrameUpdated(landmarks: Map<Int, SmoothedLandmark>, angles: PoseAngles) {
         _poseAngles.value = angles
+        val phaseResult = posePhaseDetector.update(landmarks, angles) //for pose detector
+        _posePhase.value = phaseResult.phase
+        _poseMetrics.value = phaseResult.metrics
         if (_recordingState.value is RecordingState.Recording) {
             val smoothedAnkleHip = ankleHipSmoother.smooth(landmarks)
             val frame = buildPoseFrame(