"""Generate chicken_weight.chicken_count as weigh-sample size (not leftover birds)."""

from __future__ import annotations

import random

# Deterministic: same cycle always gets the same sample sizes.
SAMPLE_RNG_SEED = 20260522
SAMPLE_MIN = 180
SAMPLE_MAX = 320


def weigh_sample_count(*, average_weight: float, rng: random.Random | None = None) -> int:
    """Birds used to compute that day's average_weight.

    0 when there is no BW reading (age 38+ user decision).
    """
    if average_weight is None or float(average_weight) <= 0:
        return 0
    rng = rng or random.Random(SAMPLE_RNG_SEED)
    return rng.randint(SAMPLE_MIN, SAMPLE_MAX)