"""转账笔缴费状态规则（正式样本缴费 / 预签约意向金共用）"""

from __future__ import annotations

from decimal import Decimal
from typing import Iterable, Optional, Tuple, Union


def can_submit_receipt(pay_status: Optional[str]) -> bool:
    return (pay_status or "").strip() == "dfj"


def can_confirm_receipt(pay_status: Optional[str]) -> bool:
    return (pay_status or "").strip() == "jfqrz"


def can_withdraw_receipt(pay_status: Optional[str]) -> bool:
    """仅付款确认中可撤回为已付款。"""
    return (pay_status or "").strip() == "jfqrz"


def can_edit_transfer(pay_status: Optional[str]) -> bool:
    """财务确认收款（yjf）前可编辑：已付款 / 付款确认中。"""
    return (pay_status or "").strip() in ("dfj", "jfqrz")


def schedule_paid_and_arrears(
    *,
    due: Union[Decimal, float, int, str, None],
    confirmed_transfers: Iterable[Union[Decimal, float, int, str, None]],
) -> Tuple[Decimal, Decimal]:
    """已缴 = Σ 已确认转账；欠缴 = 应缴 − 已缴（可为负表示超缴）。"""
    due_amt = Decimal(str(due or 0))
    paid = sum((Decimal(str(x or 0)) for x in confirmed_transfers), Decimal("0"))
    return paid, due_amt - paid