"""报销支付按未结清余额分次冲抵、分次发放，两次操作互不影响。"""
from datetime import date, datetime

import pytest
from fastapi import HTTPException
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

from app.core.bx_auth import BxUserContext
from app.models.bx_models import BxAdvanceApply, BxReimburseApply, BxReimburseOffset, BxReimbursePayment
from app.services.bx.reimburse import ReimburseService

TENANT = "shanxia2.0"
NOW = datetime(2026, 11, 5, 10, 0, 0)


def _session():
    engine = create_engine("sqlite://")
    for model in (BxReimburseApply, BxReimburseOffset, BxReimbursePayment, BxAdvanceApply):
        model.__table__.create(engine)
    return sessionmaker(bind=engine)()


def _user() -> BxUserContext:
    return BxUserContext(id="finance-1", name="财务", dept_id="dept", role="super_admin", tenant_no=TENANT)


def _apply(amount: float = 50000) -> BxReimburseApply:
    return BxReimburseApply(
        id="BX",
        apply_code="BX",
        title="报销BX",
        reimburse_date=date(2026, 11, 5),
        applicant_id="applicant",
        applicant_name="汪璇",
        expense_id="58",
        expense_name="车辆用品费",
        amount=amount,
        status="approved",
        tenant_no=TENANT,
        create_dept_id="dept",
        create_time=NOW,
        update_time=NOW,
        del_flag=0,
    )


def _advance(advance_id: str, amount: float) -> BxAdvanceApply:
    return BxAdvanceApply(
        id=advance_id,
        apply_code=advance_id,
        applicant_id="applicant",
        applicant_name="汪璇",
        reason="备用金",
        amount=amount,
        status="issued",
        issue_status="issued",
        actual_amount=amount,
        tenant_no=TENANT,
        create_dept_id="dept",
        create_time=NOW,
        update_time=NOW,
        del_flag=0,
    )


def test_offset_and_pay_are_separate_and_leave_balance_open():
    db = _session()
    db.add(_apply())
    db.add_all([_advance("ADV-A", 20000), _advance("ADV-B", 15000)])
    db.commit()

    ReimburseService.batch_offset(
        db, "BX", [{"advance_id": "ADV-A", "offset_amount": 20000}], 0, _user()
    )
    row = db.query(BxReimburseApply).one()
    assert row.status == "approved"
    assert row.pay_status is None
    assert row.pay_time is None
    assert float(row.offset_amount) == 20000
    assert row.actual_amount is None

    ReimburseService.pay(db, "BX", _user(), actual_amount=10000)
    db.refresh(row)
    assert row.status == "approved"
    assert row.pay_status is None
    assert float(row.actual_amount) == 10000
    assert float(row.offset_amount) == 20000
    assert db.query(BxReimbursePayment).count() == 1

    ReimburseService.batch_offset(
        db, "BX", [{"advance_id": "ADV-B", "offset_amount": 10000}], 0, _user()
    )
    db.refresh(row)
    assert row.status == "approved"
    assert float(row.offset_amount) == 30000
    assert db.query(BxReimburseOffset).count() == 2

    ReimburseService.pay(db, "BX", _user(), actual_amount=10000)
    db.refresh(row)
    assert row.status == "processed"
    assert row.pay_status == "paid"
    assert float(row.actual_amount) == 20000
    assert db.query(BxReimbursePayment).count() == 2

    ReimburseService.pay(db, "BX", _user(), actual_amount=1)
    assert db.query(BxReimbursePayment).count() == 2


def test_same_request_records_offset_and_pay_without_taking_the_remainder():
    db = _session()
    db.add(_apply())
    db.add(_advance("ADV-A", 20000))
    db.commit()

    ReimburseService.batch_offset(
        db, "BX", [{"advance_id": "ADV-A", "offset_amount": 20000}], 10000, _user()
    )
    row = db.query(BxReimburseApply).one()
    assert row.status == "approved"
    assert float(row.offset_amount) == 20000
    assert float(row.actual_amount) == 10000
    assert db.query(BxReimburseOffset).count() == 1
    assert db.query(BxReimbursePayment).count() == 1


def test_rejects_amount_above_balance_or_advance_remaining():
    db = _session()
    db.add(_apply())
    db.add(_advance("ADV-A", 20000))
    db.commit()

    with pytest.raises(HTTPException) as pay_exc:
        ReimburseService.pay(db, "BX", _user(), actual_amount=50001)
    assert pay_exc.value.status_code == 400

    with pytest.raises(HTTPException) as offset_exc:
        ReimburseService.batch_offset(
            db, "BX", [{"advance_id": "ADV-A", "offset_amount": 20001}], 0, _user()
        )
    assert offset_exc.value.status_code == 400
    row = db.query(BxReimburseApply).one()
    assert row.status == "approved"
    assert row.offset_amount is None
    assert db.query(BxReimbursePayment).count() == 0