initial commit

backend/app/services/weights.py

@@ -0,0 +1,33 @@
+from __future__ import annotations
+
+from app.config import settings
+
+# Шаг корректировки/ввода веса вспомогательных (прибавка и снижение).
+ACCESSORY_STEP_KG = 0.5
+
+
+def weight_step_for(exercise_name: str | None = None, *, kind: str | None = None) -> float:
+    """Жим — блины (config). Вспомогательные — 0.5 кг."""
+    if kind == "bench" or (exercise_name == "Жим"):
+        return settings.plate_step_kg
+    if kind in ("accessory", "failure"):
+        return ACCESSORY_STEP_KG
+    if exercise_name:
+        return ACCESSORY_STEP_KG
+    return settings.plate_step_kg
+
+
+def round_to_plate(weight_kg: float, step: float | None = None) -> float:
+    step = step if step is not None else settings.plate_step_kg
+    if weight_kg <= 0:
+        return 0.0
+    return round(round(weight_kg / step) * step, 2)
+
+
+def round_exercise_weight(weight_kg: float, exercise_name: str, *, kind: str | None = None) -> float:
+    return round_to_plate(weight_kg, weight_step_for(exercise_name, kind=kind))
+
+
+def bench_weight(one_rm_kg: float, percent: float) -> float:
+    """Жим: округление как раньше — по plate_step_kg (1.25)."""
+    return round_to_plate(one_rm_kg * (percent / 100.0), settings.plate_step_kg)