"""合同附件：没传不动，显式空数组清空。"""
from decimal import Decimal
from types import SimpleNamespace

from app.crud.crm.contract import _apply_contract_entity_fields

_STORED = '[{"ossId":"/contract/a.pdf","category":"scan"}]'


def _entity():
    return SimpleNamespace(
        attachment_files=_STORED,
        customer_id="",
        contact_id=None,
        owner_user_id=None,
        status="executing",
        tax_rate=None,
        received_amount=Decimal("0"),
        invoice_amount=Decimal("0"),
        amount=Decimal("1"),
    )


def test_omitted_attachment_files_are_left_unchanged():
    entity = _entity()
    _apply_contract_entity_fields(entity, {"remark": "只改备注"}, db=None, tenant_no="t", is_create=False)
    assert entity.attachment_files == _STORED


def test_explicit_empty_attachment_values_clear_the_field():
    for empty in ("[]", "", []):
        entity = _entity()
        _apply_contract_entity_fields(
            entity, {"attachmentFiles": empty}, db=None, tenant_no="t", is_create=False
        )
        assert entity.attachment_files == "[]"