# 出站一批上限。

from __future__ import annotations

import os

MAX_BATCH = 500
LIMIT_ENV = "OMS_OUTBOUND_BATCH_LIMIT"


# 读 OMS_OUTBOUND_BATCH_LIMIT。缺省、非整数或非正数时用 500。
def batch_limit() -> int:
    raw = os.getenv(LIMIT_ENV, "").strip()
    if not raw:
        return MAX_BATCH
    try:
        value = int(raw)
    except ValueError:
        return MAX_BATCH
    if value <= 0:
        return MAX_BATCH
    return value