"""Nachweis, dass die Engine unmittelbar auf den ORM-Objekten arbeitet.

Die Objekte werden nur im Speicher gebaut – es wird keine Session benötigt.
"""

from datetime import date
from decimal import Decimal

from app.models import AmountVersion, Occurrence, Recurrence
from app.models.enums import BusinessDayShift, EntryKind, OccurrenceStatus
from app.services.recurrence import expand, monthly_reserve, notice_deadline


def test_engine_arbeitet_direkt_auf_dem_ormmodell() -> None:
    recurrence = Recurrence(
        id=7,
        kind=EntryKind.EXPENSE,
        title="Netflix",
        category_id=1,
        account_id=2,
        amount=Decimal("13.99"),
        is_variable=False,
        currency="EUR",
        rrule="FREQ=MONTHLY;BYMONTHDAY=1",
        dtstart=date(2026, 1, 1),
        business_day_shift=BusinessDayShift.NEXT,
        holiday_region="DE-NW",
        reserve_enabled=False,
        is_active=True,
    )
    recurrence.amount_versions = [
        AmountVersion(amount=Decimal("9.99"), valid_from=date(2026, 1, 1)),
        AmountVersion(amount=Decimal("13.99"), valid_from=date(2026, 4, 1)),
    ]
    overlay = Occurrence(
        id=99,
        recurrence_id=7,
        occurrence_date=date(2026, 2, 1),
        status=OccurrenceStatus.CONFIRMED,
        planned_amount=Decimal("9.99"),
        actual_amount=Decimal("9.99"),
        actual_date=date(2026, 2, 2),
    )

    result = expand(recurrence, date(2026, 1, 1), date(2026, 5, 31), occurrences=[overlay])

    assert [item.nominal_date.month for item in result] == [1, 2, 3, 4, 5]
    assert result[0].recurrence_id == 7
    assert result[0].account_id == 2
    assert result[0].due_date == date(2026, 1, 2)  # 01.01. ist Feiertag
    assert [item.amount for item in result] == [
        Decimal("9.99"),
        Decimal("9.99"),
        Decimal("9.99"),
        Decimal("13.99"),
        Decimal("13.99"),
    ]
    assert result[1].status is OccurrenceStatus.CONFIRMED
    assert result[1].occurrence_id == 99


def test_vertrags_und_ruecklagenlogik_auf_dem_ormmodell() -> None:
    recurrence = Recurrence(
        kind=EntryKind.EXPENSE,
        title="Kfz-Versicherung",
        category_id=1,
        account_id=1,
        amount=Decimal("612.00"),
        is_variable=False,
        currency="EUR",
        rrule="FREQ=YEARLY;BYMONTH=1;BYMONTHDAY=15",
        dtstart=date(2026, 1, 15),
        business_day_shift=BusinessDayShift.NEXT,
        holiday_region="DE-NW",
        contract_start=date(2026, 1, 1),
        contract_min_term_months=12,
        contract_notice_period_days=30,
        contract_auto_renew_months=12,
        reserve_enabled=True,
        is_active=True,
    )

    assert monthly_reserve(recurrence, as_of=date(2026, 1, 1)) == Decimal("51.00")
    assert notice_deadline(recurrence, as_of=date(2026, 6, 1)) == date(2026, 12, 1)