120 lines
3.3 KiB
Python
120 lines
3.3 KiB
Python
import math
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from typing import Any
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def _is_female(sex: str) -> bool:
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return sex.lower() in ("f", "female", "ж", "женский", "woman")
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def _clamp_bf(value: float) -> float:
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return round(max(3.0, min(50.0, value)), 1)
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def navy_body_fat_pct(
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*,
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sex: str,
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height_cm: float,
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neck_cm: float,
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waist_cm: float,
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hip_cm: float | None = None,
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) -> float | None:
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if height_cm <= 0 or neck_cm <= 0 or waist_cm <= 0:
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return None
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if _is_female(sex):
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if hip_cm is None or hip_cm <= 0:
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return None
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measurement_sum_cm = waist_cm + hip_cm - neck_cm
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if measurement_sum_cm <= 0:
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return None
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denom = (
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1.29579
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- 0.35004 * math.log10(measurement_sum_cm)
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+ 0.22100 * math.log10(height_cm)
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)
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else:
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measurement_diff_cm = waist_cm - neck_cm
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if measurement_diff_cm <= 0:
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return None
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denom = (
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1.0324
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- 0.19077 * math.log10(measurement_diff_cm)
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+ 0.15456 * math.log10(height_cm)
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)
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if denom <= 0:
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return None
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return _clamp_bf(495.0 / denom - 450.0)
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def whr(waist_cm: float, hip_cm: float) -> float | None:
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if waist_cm <= 0 or hip_cm <= 0:
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return None
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return round(waist_cm / hip_cm, 2)
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def lean_body_mass(weight_kg: float, body_fat_pct: float) -> float:
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return round(weight_kg * (1.0 - body_fat_pct / 100.0), 1)
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def ffmi(weight_kg: float, height_cm: float, body_fat_pct: float) -> float | None:
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if height_cm <= 0:
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return None
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height_m = height_cm / 100.0
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lbm = weight_kg * (1.0 - body_fat_pct / 100.0)
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raw = lbm / (height_m * height_m)
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normalized = raw + 6.1 * (1.8 - height_m)
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return round(normalized, 1)
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def compute_body_composition(
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*,
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sex: str,
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height_cm: float,
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weight_kg: float,
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neck_cm: float | None = None,
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waist_cm: float | None = None,
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hip_cm: float | None = None,
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body_fat_pct: float | None = None,
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) -> dict[str, Any]:
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warnings: list[str] = []
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result: dict[str, Any] = {
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"body_fat_pct": None,
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"body_fat_method": None,
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"whr": None,
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"lbm_kg": None,
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"ffmi": None,
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"warnings": warnings,
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}
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bf = body_fat_pct
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method: str | None = "manual" if bf is not None else None
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if bf is None and neck_cm and waist_cm:
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navy_bf = navy_body_fat_pct(
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sex=sex,
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height_cm=height_cm,
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neck_cm=neck_cm,
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waist_cm=waist_cm,
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hip_cm=hip_cm,
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)
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if navy_bf is not None:
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bf = navy_bf
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method = "navy"
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elif _is_female(sex) and not hip_cm:
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warnings.append("Для Navy у женщин нужен обхват бёдер (hip_cm).")
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elif neck_cm and waist_cm and waist_cm <= neck_cm:
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warnings.append("Обхват талии должен быть больше шеи для Navy.")
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if bf is not None:
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result["body_fat_pct"] = round(float(bf), 1)
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result["body_fat_method"] = method
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result["lbm_kg"] = lean_body_mass(weight_kg, float(bf))
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result["ffmi"] = ffmi(weight_kg, height_cm, float(bf))
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if waist_cm and hip_cm:
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result["whr"] = whr(waist_cm, hip_cm)
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return result
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