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938949f | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | """Shared utility functions for SolarWine."""
from __future__ import annotations
from typing import Optional
def cwsi_from_delta_t(
leaf_temp_c: Optional[float] = None,
air_temp_c: Optional[float] = None,
*,
delta_t: Optional[float] = None,
) -> float:
"""Compute CWSI proxy from leaf–air temperature differential.
Scale: 0°C delta → CWSI=0, 10°C delta → CWSI=1.
Clamped to [0.0, 1.0].
Can be called with (leaf_temp_c, air_temp_c) or with delta_t= directly.
"""
if delta_t is None:
if leaf_temp_c is None or air_temp_c is None:
raise ValueError("Provide (leaf_temp_c, air_temp_c) or delta_t=")
delta_t = leaf_temp_c - air_temp_c
return max(0.0, min(1.0, delta_t / 10.0))
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