from datetime import datetime
from decimal import Decimal

import pytest
from sqlalchemy import create_engine, update
from sqlalchemy.orm import Query, sessionmaker

from app.api.collection_protocol import _persist_protocol_sub_resources
from app.crud.collection_protocol import save_payment_details, save_payment_with_details
from app.models.base import Base
from app.models.models import BizProtocolPayment, BizProtocolPaymentDetail


def _session(*, allow_null_pay_status=False):
    engine = create_engine("sqlite:///:memory:")
    pay_status_column = BizProtocolPaymentDetail.__table__.c.pay_status
    original_nullable = pay_status_column.nullable
    try:
        if allow_null_pay_status:
            pay_status_column.nullable = True
        Base.metadata.create_all(
            engine,
            tables=[BizProtocolPayment.__table__, BizProtocolPaymentDetail.__table__],
        )
    finally:
        pay_status_column.nullable = original_nullable
    return sessionmaker(bind=engine)()


def _payment(
    db,
    *,
    payment_id="payment-a",
    tenant_no="tenant-a",
    pay_mode="dj",
    contract_amount="1000",
    installment_count=None,
):
    row = BizProtocolPayment(
        id=payment_id,
        collection_protocol_id="protocol-a",
        pay_mode=pay_mode,
        contract_amount=Decimal(contract_amount),
        installment_count=installment_count,
        installment_ratios="[1000, 1000]" if installment_count == 2 else None,
        tenant_no=tenant_no,
        create_dept_id="",
        create_time=datetime(2026, 10, 14),
        update_time=datetime(2026, 10, 14),
        del_flag=0,
    )
    db.add(row)
    db.commit()
    return row


def _detail(
    db,
    *,
    detail_id="detail-a",
    payment_id="payment-a",
    tenant_no="tenant-a",
    pay_status="ytf",
    due_amount="1000",
    installment_no=None,
    installment_due_date=None,
):
    row = BizProtocolPaymentDetail(
        id=detail_id,
        payment_id=payment_id,
        transfer_type="bank",
        due_amount=Decimal(due_amount),
        transfer_amount=Decimal(due_amount),
        transfer_time=datetime(2026, 10, 1, 10, 0, 0),
        transfer_attachments="receipt.pdf",
        finance_confirm_attachments="finance.pdf",
        finance_remark="confirmed",
        refund_finance_confirm_attachments="refund-confirm.pdf",
        refund_finance_remark="refund confirmed",
        pay_status=pay_status,
        installment_no=installment_no,
        installment_due_date=installment_due_date,
        refund_amount=Decimal("100"),
        refund_remark="refund requested",
        refund_attachments="refund.pdf",
        tenant_no=tenant_no,
        create_dept_id="",
        create_time=datetime(2026, 10, 14),
        update_time=datetime(2026, 10, 14),
        del_flag=0,
    )
    db.add(row)
    db.commit()
    if pay_status is None:
        db.execute(
            update(BizProtocolPaymentDetail)
            .where(BizProtocolPaymentDetail.id == detail_id)
            .values(pay_status=None)
        )
        db.commit()
        db.refresh(row)
    return row


@pytest.mark.parametrize(
    "pay_status", ["jfqrz", "yjf", "tfqrz", "ytf", "future_locked", None, "", "   ", " dfj "]
)
def test_locked_detail_is_preserved_when_omitted(pay_status):
    db = _session(allow_null_pay_status=pay_status is None)
    _payment(db)
    _detail(db, pay_status=pay_status)

    rows = save_payment_details(
        db,
        payment_id="payment-a",
        tenant_no="tenant-a",
        user_id="market-user",
        details=[],
    )

    assert len(rows) == 1
    row = rows[0]
    assert row.id == "detail-a"
    assert row.del_flag == 0
    assert row.pay_status == pay_status


@pytest.mark.parametrize(
    "pay_status", ["jfqrz", "yjf", "tfqrz", "ytf", "future_locked", None, "", "   ", " dfj "]
)
def test_locked_detail_is_immutable_when_submitted_by_id(pay_status):
    db = _session(allow_null_pay_status=pay_status is None)
    _payment(db)
    _detail(db, pay_status=pay_status)

    rows = save_payment_details(
        db,
        payment_id="payment-a",
        tenant_no="tenant-a",
        user_id="market-user",
        details=[
            {
                "id": "detail-a",
                "transferType": "cash",
                "dueAmount": 1,
                "transferAmount": 2,
                "transferTime": "2026-12-31 23:59:59",
                "installmentNo": 9,
                "installmentDueDate": "20261231",
                "remark": "tampered",
                "attachments": [{"fileUrl": "tampered.pdf"}],
            }
        ],
    )

    assert len(rows) == 1
    row = rows[0]
    assert row.id == "detail-a"
    assert row.pay_status == pay_status
    assert row.transfer_type == "bank"
    assert row.due_amount == Decimal("1000")
    assert row.transfer_amount == Decimal("1000")
    assert row.transfer_time == datetime(2026, 10, 1, 10, 0, 0)
    assert row.installment_no is None
    assert row.installment_due_date is None
    assert row.remark is None
    assert row.transfer_attachments == "receipt.pdf"
    assert row.finance_confirm_attachments == "finance.pdf"
    assert row.finance_remark == "confirmed"
    assert row.refund_amount == Decimal("100")
    assert row.refund_remark == "refund requested"
    assert row.refund_attachments == "refund.pdf"
    assert row.refund_finance_confirm_attachments == "refund-confirm.pdf"
    assert row.refund_finance_remark == "refund confirmed"


def test_mixed_save_updates_and_deletes_only_drafts_and_creates_safe_row():
    db = _session()
    _payment(db)
    _detail(db, detail_id="locked", pay_status="yjf")
    _detail(db, detail_id="draft-update", pay_status="dfj", due_amount="200")
    _detail(db, detail_id="draft-delete", pay_status="dfj", due_amount="300")

    rows = save_payment_details(
        db,
        payment_id="payment-a",
        tenant_no="tenant-a",
        user_id="market-user",
        details=[
            {
                "id": "locked",
                "dueAmount": 1,
                "transferAmount": 1,
                "remark": "tampered",
            },
            {
                "id": "draft-update",
                "transferType": "cash",
                "dueAmount": 250,
                "transferAmount": 150,
                "transferTime": "2026-10-20 12:00:00",
                "remark": "updated draft",
                "attachments": [{"fileUrl": "draft-new.pdf"}],
            },
            {
                "dueAmount": 500,
                "transferAmount": 0,
                "remark": "new draft",
            },
        ],
    )

    by_id = {row.id: row for row in rows}
    assert by_id["locked"].due_amount == Decimal("1000")
    assert by_id["locked"].remark is None
    assert by_id["draft-update"].due_amount == Decimal("250")
    assert by_id["draft-update"].transfer_amount == Decimal("150")
    assert by_id["draft-update"].remark == "updated draft"
    new_rows = [row for row in rows if row.id not in {"locked", "draft-update"}]
    assert len(new_rows) == 1
    assert new_rows[0].pay_status == "dfj"
    deleted = db.query(BizProtocolPaymentDetail).filter_by(id="draft-delete").one()
    assert deleted.del_flag == 1


def test_foreign_or_unknown_detail_id_is_rejected_without_mutation():
    db = _session()
    _payment(db)
    _detail(db)
    _payment(db, payment_id="payment-b", tenant_no="tenant-b")
    _detail(db, detail_id="detail-b", payment_id="payment-b", tenant_no="tenant-b")

    with pytest.raises(ValueError, match="缴费明细不存在或不属于当前缴费方案"):
        save_payment_details(
            db,
            payment_id="payment-a",
            tenant_no="tenant-a",
            user_id="market-user",
            details=[
                {
                    "id": "detail-b",
                    "dueAmount": 1000,
                    "transferAmount": 1000,
                }
            ],
        )

    db.expire_all()
    own = db.query(BizProtocolPaymentDetail).filter_by(id="detail-a").one()
    foreign = db.query(BizProtocolPaymentDetail).filter_by(id="detail-b").one()
    assert own.del_flag == 0
    assert own.pay_status == "ytf"
    assert foreign.del_flag == 0
    assert foreign.pay_status == "ytf"


def test_final_effective_rows_reject_omitted_locked_row_plus_full_new_plan():
    db = _session()
    _payment(db, pay_mode="fq", contract_amount="2000", installment_count=2)
    _detail(db, pay_status="yjf", installment_no=1)

    with pytest.raises(ValueError, match="明细条数|无法切换分期类型"):
        save_payment_details(
            db,
            payment_id="payment-a",
            tenant_no="tenant-a",
            user_id="market-user",
            details=[
                {"installmentNo": 2, "dueAmount": 1000},
                {"installmentNo": 3, "dueAmount": 1000},
            ],
        )

    db.expire_all()
    locked = db.query(BizProtocolPaymentDetail).filter_by(id="detail-a").one()
    assert locked.del_flag == 0
    assert locked.installment_no == 1
    assert locked.pay_status == "yjf"


def test_final_effective_rows_use_locked_period_and_reject_duplicate_number():
    db = _session()
    _payment(db, pay_mode="fq", contract_amount="2000", installment_count=2)
    _detail(db, pay_status="yjf", installment_no=1)

    with pytest.raises(ValueError, match="期号.*重复"):
        save_payment_details(
            db,
            payment_id="payment-a",
            tenant_no="tenant-a",
            user_id="market-user",
            details=[
                {
                    "id": "detail-a",
                    "installmentNo": 2,
                    "dueAmount": 1,
                },
                {"installmentNo": 1, "dueAmount": 1000},
            ],
        )

    db.expire_all()
    locked = db.query(BizProtocolPaymentDetail).filter_by(id="detail-a").one()
    assert locked.installment_no == 1
    assert locked.due_amount == Decimal("1000")


def test_save_payment_details_locks_payment_and_detail_rows(monkeypatch):
    db = _session()
    _payment(db)
    _detail(db, pay_status="dfj")
    calls = []
    original = Query.with_for_update

    def tracking_with_for_update(query, *args, **kwargs):
        calls.append(query)
        return original(query, *args, **kwargs)

    monkeypatch.setattr(Query, "with_for_update", tracking_with_for_update)

    save_payment_details(
        db,
        payment_id="payment-a",
        tenant_no="tenant-a",
        user_id="market-user",
        details=[{"id": "detail-a", "dueAmount": 1000}],
    )

    assert len(calls) >= 2


def test_v1_aggregate_save_rolls_back_parent_when_locked_detail_validation_fails():
    db = _session()
    payment = _payment(
        db,
        pay_mode="fq",
        contract_amount="2000",
        installment_count=2,
    )
    payment.installment_interval_months = Decimal("12")
    payment.installment_start_date = "20261001"
    payment.installment_advance_days = 30
    payment.installment_ratios = "[500, 500]"
    payment.remark = "original plan"
    db.commit()
    _detail(
        db,
        detail_id="locked-period-2",
        pay_status="yjf",
        due_amount="1000",
        installment_no=2,
    )

    with pytest.raises(ValueError, match="明细条数|无法切换分期类型"):
        _persist_protocol_sub_resources(
            db,
            "protocol-a",
            "tenant-a",
            "market-user",
            party_customer=None,
            collection_info=None,
            samples=None,
            payment={
                "payMode": "djfq",
                "contractAmount": 700,
                "installmentCount": 1,
                "installmentIntervalMonths": 9,
                "installmentStartDate": "20270101",
                "installmentAdvanceDays": 15,
                "installmentRatios": [1000],
                "remark": "tampered plan",
            },
            payment_details=[],
            storage_cert=None,
            payment_model_version=1,
        )

    db.rollback()
    db.expire_all()
    saved_payment = db.get(BizProtocolPayment, "payment-a")
    assert saved_payment.contract_amount == Decimal("2000")
    assert saved_payment.pay_mode == "fq"
    assert saved_payment.installment_count == 2
    assert saved_payment.installment_interval_months == Decimal("12")
    assert saved_payment.installment_start_date == "20261001"
    assert saved_payment.installment_advance_days == 30
    assert saved_payment.installment_ratios == "[500, 500]"
    assert saved_payment.remark == "original plan"
    locked = db.get(BizProtocolPaymentDetail, "locked-period-2")
    assert locked.del_flag == 0
    assert locked.pay_status == "yjf"
    assert locked.installment_no == 2
    assert locked.due_amount == Decimal("1000")


def test_v1_aggregate_passes_exact_max_amount_installments_to_persistence(monkeypatch):
    from app.crud import collection_protocol as collection_crud

    db = _session()
    payment = _payment(
        db,
        pay_mode="fq",
        contract_amount="100.00",
        installment_count=2,
    )
    payment.installment_ratios = None
    payment.installment_interval_months = Decimal("12")
    payment.installment_start_date = "20261001"
    db.commit()
    captured = {}

    def capture_details(
        _db,
        _payment_id,
        _tenant_no,
        _user_id,
        details,
        **_kwargs,
    ):
        captured["details"] = details
        return []

    monkeypatch.setattr(collection_crud, "save_payment_details", capture_details)

    save_payment_with_details(
        db,
        "protocol-a",
        "tenant-a",
        "market-user",
        payment={
            "pay_mode": "fq",
            "contract_amount": "9999999999999999.99",
            "installment_count": 2,
            "installment_interval_months": "12",
            "installment_start_date": "20261001",
            "installment_ratios": None,
        },
        payment_details=[],
    )

    assert [row["due_amount"] for row in captured["details"]] == [
        "4999999999999999.99",
        "5000000000000000",
    ]
    assert sum(
        Decimal(row["due_amount"]) for row in captured["details"]
    ) == Decimal("9999999999999999.99")


def test_v1_aggregate_validates_drafts_against_remaining_contract_amount():
    db = _session()
    payment = _payment(
        db, pay_mode="fq", contract_amount="3000", installment_count=3
    )
    payment.installment_interval_months = Decimal("12")
    payment.installment_start_date = "20261001"
    payment.installment_advance_days = 30
    payment.installment_ratios = None
    db.commit()
    _detail(
        db, detail_id="paid-1", pay_status="yjf", due_amount="500",
        installment_no=1, installment_due_date="20261001",
    )
    _detail(
        db, detail_id="draft-2", pay_status="dfj", due_amount="1000",
        installment_no=2, installment_due_date="20270901",
    )
    _detail(
        db, detail_id="draft-3", pay_status="dfj", due_amount="1500",
        installment_no=3, installment_due_date="20280901",
    )

    saved = save_payment_with_details(
        db,
        "protocol-a",
        "tenant-a",
        "market-user",
        payment={
            "pay_mode": "fq",
            "contract_amount": "3000.00",
            "installment_count": 3,
            "installment_interval_months": "24",
            "installment_start_date": "20261001",
            "installment_advance_days": 30,
            "installment_ratios": None,
        },
        payment_details=[
            {
                "id": "paid-1", "installment_no": 1,
                "installment_due_date": "20261001", "due_amount": "500.00",
            },
            {
                "id": "draft-2", "installment_no": 2,
                "installment_due_date": "20280901", "due_amount": "1250.00",
            },
            {
                "id": "draft-3", "installment_no": 3,
                "installment_due_date": "20300901", "due_amount": "1250.00",
            },
        ],
    )

    assert saved.installment_interval_months == Decimal("24")
    rows = {
        row.id: row
        for row in db.query(BizProtocolPaymentDetail)
        .filter(BizProtocolPaymentDetail.del_flag == 0)
        .all()
    }
    assert rows["paid-1"].due_amount == Decimal("500")
    assert rows["draft-2"].due_amount == Decimal("1250")
    assert rows["draft-3"].due_amount == Decimal("1250")


def test_v1_aggregate_uses_remaining_period_ratio_weights():
    db = _session()
    payment = _payment(
        db, pay_mode="fq", contract_amount="3000", installment_count=3
    )
    payment.installment_interval_months = Decimal("12")
    payment.installment_start_date = "20261001"
    payment.installment_advance_days = 30
    payment.installment_ratios = "[10, 45, 45]"
    db.commit()
    _detail(
        db, detail_id="ratio-paid-1", pay_status="yjf", due_amount="500",
        installment_no=1, installment_due_date="20261001",
    )
    _detail(
        db, detail_id="ratio-draft-2", pay_status="dfj", due_amount="1250",
        installment_no=2, installment_due_date="20270901",
    )
    _detail(
        db, detail_id="ratio-draft-3", pay_status="dfj", due_amount="1250",
        installment_no=3, installment_due_date="20280901",
    )

    save_payment_with_details(
        db,
        "protocol-a",
        "tenant-a",
        "market-user",
        payment={
            "pay_mode": "fq",
            "contract_amount": "3000.00",
            "installment_count": 3,
            "installment_interval_months": "12",
            "installment_start_date": "20261001",
            "installment_advance_days": 30,
            "installment_ratios": [10, 30, 60],
        },
        payment_details=[
            {
                "id": "ratio-paid-1", "installment_no": 1,
                "installment_due_date": "20261001", "due_amount": "500.00",
            },
            {
                "id": "ratio-draft-2", "installment_no": 2,
                "installment_due_date": "20270901", "due_amount": "833.33",
            },
            {
                "id": "ratio-draft-3", "installment_no": 3,
                "installment_due_date": "20280901", "due_amount": "1666.67",
            },
        ],
    )

    db.expire_all()
    assert db.get(BizProtocolPaymentDetail, "ratio-draft-2").due_amount == Decimal("833.33")
    assert db.get(BizProtocolPaymentDetail, "ratio-draft-3").due_amount == Decimal("1666.67")


def test_locked_remaining_distribution_keeps_max_amount_cent_tail():
    from app.services.protocol_payment_installment import (
        resolve_locked_remaining_due_amounts,
    )

    amounts = resolve_locked_remaining_due_amounts(
        Decimal("9999999999999999.99"),
        Decimal("0.02"),
        [],
        [1, 2],
    )

    assert amounts == [
        Decimal("4999999999999999.98"),
        Decimal("4999999999999999.99"),
    ]
    assert sum(amounts, Decimal("0.02")) == Decimal("9999999999999999.99")


def test_v1_aggregate_rejects_contract_below_locked_due_and_rolls_back():
    db = _session()
    payment = _payment(
        db, pay_mode="fq", contract_amount="3000", installment_count=2
    )
    payment.installment_interval_months = Decimal("12")
    payment.installment_start_date = "20261001"
    payment.installment_advance_days = 30
    db.commit()
    _detail(
        db, detail_id="locked-over-contract", pay_status="yjf",
        due_amount="500", installment_no=1,
        installment_due_date="20261001",
    )

    with pytest.raises(ValueError, match="合同金额不能小于"):
        save_payment_with_details(
            db,
            "protocol-a",
            "tenant-a",
            "market-user",
            payment={
                "pay_mode": "fq", "contract_amount": "400.00",
                "installment_count": 2, "installment_interval_months": "24",
                "installment_start_date": "20261001",
                "installment_advance_days": 30,
                "installment_ratios": None,
            },
            payment_details=[
                {
                    "id": "locked-over-contract", "installment_no": 1,
                    "installment_due_date": "20261001", "due_amount": "500.00",
                },
                {
                    "installment_no": 2, "installment_due_date": "20280901",
                    "due_amount": "0.00",
                },
            ],
        )

    db.expire_all()
    assert db.get(BizProtocolPayment, "payment-a").contract_amount == Decimal("3000")


@pytest.mark.parametrize(
    ("draft_no", "draft_date", "message"),
    [
        (4, "20280901", "期号"),
        (2, "20270901", "应缴时间"),
    ],
)
def test_v1_aggregate_rejects_remaining_period_or_date_mismatch(
    draft_no, draft_date, message
):
    db = _session()
    payment = _payment(
        db, pay_mode="fq", contract_amount="3000", installment_count=3
    )
    payment.installment_interval_months = Decimal("12")
    payment.installment_start_date = "20261001"
    payment.installment_advance_days = 30
    payment.installment_ratios = None
    db.commit()
    _detail(
        db, detail_id="guard-paid-1", pay_status="yjf", due_amount="500",
        installment_no=1, installment_due_date="20261001",
    )
    _detail(
        db, detail_id="guard-draft-2", pay_status="dfj", due_amount="1250",
        installment_no=2, installment_due_date="20270901",
    )
    _detail(
        db, detail_id="guard-draft-3", pay_status="dfj", due_amount="1250",
        installment_no=3, installment_due_date="20280901",
    )

    with pytest.raises(ValueError, match=message):
        save_payment_with_details(
            db,
            "protocol-a",
            "tenant-a",
            "market-user",
            payment={
                "pay_mode": "fq", "contract_amount": "3000.00",
                "installment_count": 3, "installment_interval_months": "24",
                "installment_start_date": "20261001",
                "installment_advance_days": 30,
                "installment_ratios": None,
            },
            payment_details=[
                {
                    "id": "guard-paid-1", "installment_no": 1,
                    "installment_due_date": "20261001", "due_amount": "500.00",
                },
                {
                    "id": "guard-draft-2", "installment_no": draft_no,
                    "installment_due_date": draft_date, "due_amount": "1250.00",
                },
                {
                    "id": "guard-draft-3", "installment_no": 3,
                    "installment_due_date": "20300901", "due_amount": "1250.00",
                },
            ],
        )

    db.expire_all()
    assert db.get(BizProtocolPayment, "payment-a").installment_interval_months == Decimal("12")


def test_v1_aggregate_rejects_invalid_all_draft_plan_and_rolls_back():
    db = _session()
    payment = _payment(
        db, pay_mode="fq", contract_amount="100", installment_count=2
    )
    payment.installment_interval_months = Decimal("1")
    payment.installment_start_date = "20260131"
    payment.installment_advance_days = 0
    payment.installment_ratios = None
    payment.remark = "original"
    db.commit()

    with pytest.raises(ValueError, match="期号|应缴金额|应缴时间"):
        save_payment_with_details(
            db,
            "protocol-a",
            "tenant-a",
            "market-user",
            payment={
                "pay_mode": "fq", "contract_amount": "100.00",
                "installment_count": 2, "installment_interval_months": "2",
                "installment_start_date": "20260131",
                "installment_advance_days": 0,
                "installment_ratios": None, "remark": "tampered",
            },
            payment_details=[
                {
                    "installment_no": 99, "installment_due_date": "20000101",
                    "due_amount": "1.00",
                },
                {
                    "installment_no": 100, "installment_due_date": "19990101",
                    "due_amount": "2.00",
                },
            ],
        )

    db.expire_all()
    saved = db.get(BizProtocolPayment, "payment-a")
    assert saved.installment_interval_months == Decimal("1")
    assert saved.remark == "original"
    assert db.query(BizProtocolPaymentDetail).count() == 0


def test_v1_aggregate_accepts_complete_all_draft_plan_with_clamped_dates():
    db = _session()
    payment = _payment(
        db, pay_mode="fq", contract_amount="100", installment_count=2
    )
    payment.installment_interval_months = Decimal("1")
    payment.installment_start_date = "20260131"
    payment.installment_advance_days = 0
    payment.installment_ratios = None
    db.commit()

    save_payment_with_details(
        db,
        "protocol-a",
        "tenant-a",
        "market-user",
        payment={
            "pay_mode": "fq", "contract_amount": "100.00",
            "installment_count": 2, "installment_interval_months": "1",
            "installment_start_date": "20260131",
            "installment_advance_days": 0,
            "installment_ratios": None,
        },
        payment_details=[
            {
                "installment_no": 1, "installment_due_date": "20260131",
                "due_amount": "50.00",
            },
            {
                "installment_no": 2, "installment_due_date": "20260228",
                "due_amount": "50.00",
            },
        ],
    )

    rows = db.query(BizProtocolPaymentDetail).order_by(
        BizProtocolPaymentDetail.installment_no
    ).all()
    assert [row.installment_no for row in rows] == [1, 2]
    assert [row.installment_due_date for row in rows] == ["20260131", "20260228"]
    assert [row.due_amount for row in rows] == [Decimal("50"), Decimal("50")]


def test_v1_aggregate_rejects_unknown_pay_mode_and_rolls_back():
    db = _session()
    payment = _payment(db, pay_mode="dj", contract_amount="100")
    payment.remark = "original"
    db.commit()

    with pytest.raises(ValueError, match="缴费模式"):
        save_payment_with_details(
            db,
            "protocol-a",
            "tenant-a",
            "market-user",
            payment={
                "pay_mode": "evil",
                "contract_amount": "1.00",
                "remark": "tampered",
            },
            payment_details=[],
        )

    db.expire_all()
    saved = db.get(BizProtocolPayment, "payment-a")
    assert saved.pay_mode == "dj"
    assert saved.contract_amount == Decimal("100")
    assert saved.remark == "original"


@pytest.mark.parametrize(
    ("payment_patch", "detail_patch"),
    [
        ({"lump_sum_deadline": "20261399"}, {}),
        ({}, {"installment_due_date": "20230229"}),
    ],
)
def test_v1_aggregate_rejects_invalid_calendar_dates_and_rolls_back(
    payment_patch, detail_patch
):
    db = _session()
    payment = _payment(db, pay_mode="dj", contract_amount="100")
    payment.lump_sum_deadline = "20261231"
    payment.remark = "original"
    db.commit()

    with pytest.raises(ValueError, match="日期"):
        save_payment_with_details(
            db,
            "protocol-a",
            "tenant-a",
            "market-user",
            payment={
                "pay_mode": "dj",
                "contract_amount": "100.00",
                "lump_sum_deadline": "20261231",
                "remark": "tampered",
                **payment_patch,
            },
            payment_details=[{
                "installment_due_date": "20261231",
                "due_amount": "100.00",
                **detail_patch,
            }],
        )

    db.expire_all()
    saved = db.get(BizProtocolPayment, "payment-a")
    assert saved.lump_sum_deadline == "20261231"
    assert saved.remark == "original"
    assert db.query(BizProtocolPaymentDetail).count() == 0