refactor: reorganize backend modules into sub-packages for models, data, visualization, wafer, and controllers

src/pygui/backend/models/session_model.py

@@ -0,0 +1,39 @@
+from __future__ import annotations
+from dataclasses import dataclass
+
+from pygui.backend.models.frame import Frame
+from pygui.backend.models.frame_stats import Stats, compute_stats
+from pygui.backend.models.stability_detector import StabilityDetector
+from pygui.backend.models.threshold_classifier import ThresholdConfig, classify, resolve_bounds
+
+@dataclass(frozen=True)
+class SessionUpdate:
+    seq: int
+    values: list[float]
+    bands: list[str]
+    stats: Stats
+    state: str
+    target: float
+    margin: float
+    
+class SessionModel:
+    def __init__(self, thresholds: ThresholdConfig | None = None) -> None:
+        self._config = thresholds or ThresholdConfig()
+        self._stability = StabilityDetector()
+        
+    def set_thresholds(self, config: ThresholdConfig) -> None:
+        self._config = config
+        
+    def reset(self) -> None:
+        self._stability.reset()
+        
+    def process(self, frame: Frame) -> SessionUpdate:
+        stats = compute_stats(frame.values)
+        target, margin = resolve_bounds(frame.values, self._config)
+        bands = [classify(v, target, margin)for v in frame.values]
+        # State always track the user's process set_point, even in auto-color mode.
+        state = self._stability.update(stats.avg, frame.time, self._config.set_point)
+        return SessionUpdate(
+            seq=frame.seq, values=frame.values, bands=bands, 
+            stats=stats, state=state, target=target, margin=margin,
+        )