"""Leichtgewichtige Testobjekte für die Recurrence-Engine – bewusst ohne Datenbank."""

from dataclasses import dataclass, field
from datetime import date
from decimal import Decimal

from app.models.enums import BusinessDayShift, EntryKind, OccurrenceStatus


@dataclass
class FakeAmountVersion:
    """Preisversion, gültig ab `valid_from`."""

    amount: Decimal
    valid_from: date
    note: str | None = None


@dataclass
class FakeOccurrence:
    """Materialisierte Fälligkeit, die das virtuelle Ergebnis überlagert."""

    occurrence_date: date
    status: OccurrenceStatus = OccurrenceStatus.PLANNED
    actual_amount: Decimal | None = None
    actual_date: date | None = None
    account_id: int | None = None
    note: str | None = None
    id: int | None = 1


@dataclass
class FakeRecurrence:
    """Erfüllt `RecurrenceLike` mit denselben Vorgabewerten wie das ORM-Modell."""

    rrule: str
    dtstart: date
    amount: Decimal = Decimal("100.00")
    kind: EntryKind = EntryKind.EXPENSE
    id: int | None = 1
    is_variable: bool = False
    until: date | None = None
    business_day_shift: BusinessDayShift = BusinessDayShift.NONE
    holiday_region: str = "DE-NW"
    installments_total: int | None = None
    principal_amount: Decimal | None = None
    contract_start: date | None = None
    contract_min_term_months: int | None = None
    contract_notice_period_days: int | None = None
    contract_auto_renew_months: int | None = None
    contract_cancelled_at: date | None = None
    reserve_enabled: bool = False
    account_id: int | None = 1
    amount_versions: list[FakeAmountVersion] = field(default_factory=list)


def d(value: str) -> date:
    """Kurzschreibweise für ISO-Datumsangaben in Tests."""
    return date.fromisoformat(value)


def euro(value: str) -> Decimal:
    return Decimal(value)