"""Code-owned payroll input component definitions."""

from dataclasses import dataclass

from finance.enums import PayrollComponentKind
from finance.enums import PayrollComponentPeriodScope


@dataclass(frozen=True, slots=True)
class PayrollComponentDefinition:
    code: str
    name: str
    kind: str
    requires_reason: bool
    display_order: int

    @property
    def id(self) -> str:
        return self.code

    @property
    def pk(self) -> str:
        return self.code

    @property
    def is_active(self) -> bool:
        return True

    @property
    def period_scope(self) -> str:
        return PayrollComponentPeriodScope.ALL

    @property
    def scope_period_id(self) -> None:
        return None

    def get_kind_display(self) -> str:
        return PayrollComponentKind(self.kind).label


PAYROLL_COMPONENTS = (
    PayrollComponentDefinition("VACATION_PAY", "Отпускные", PayrollComponentKind.EARNING, False, 20),
    PayrollComponentDefinition("BONUS", "Премия", PayrollComponentKind.EARNING, False, 30),
    PayrollComponentDefinition("CORRECTION_CREDIT", "Положительная корректировка", PayrollComponentKind.ADJUSTMENT_CREDIT, True, 40),
    PayrollComponentDefinition("CORRECTION_DEBIT", "Отрицательная корректировка", PayrollComponentKind.ADJUSTMENT_DEBIT, True, 41),
    PayrollComponentDefinition("ONE_TIME_PAYMENT", "Разовое начисление", PayrollComponentKind.EARNING, True, 50),
    PayrollComponentDefinition("DEDUCTION", "Удержание", PayrollComponentKind.DEDUCTION, True, 60),
    PayrollComponentDefinition("ADVANCE", "Аванс", PayrollComponentKind.PAYMENT, False, 70),
    PayrollComponentDefinition("SALARY_PAYMENT", "Фактическая выплата", PayrollComponentKind.PAYMENT, True, 80),
)
PAYROLL_COMPONENTS_BY_CODE = {component.code: component for component in PAYROLL_COMPONENTS}
PAYROLL_COMPONENT_CODE_CHOICES = tuple(
    (component.code, component.name) for component in PAYROLL_COMPONENTS
)


class _PayrollComponentCollection(tuple):
    def get(self, **criteria):
        matches = self.filter(**criteria)
        if len(matches) != 1:
            raise LookupError(f"Ожидался один вид операции, найдено: {len(matches)}")
        return matches[0]

    def filter(self, **criteria):
        return _PayrollComponentCollection(
            component
            for component in self
            if all(getattr(component, key) == value for key, value in criteria.items())
        )

    def exclude(self, **criteria):
        normalized = {
            key.removesuffix("__in"): ("in" if key.endswith("__in") else "exact", value)
            for key, value in criteria.items()
        }
        return _PayrollComponentCollection(
            component
            for component in self
            if not all(
                getattr(component, key) in value if lookup == "in" else getattr(component, key) == value
                for key, (lookup, value) in normalized.items()
            )
        )

    def all(self):
        return self

    def order_by(self, *fields):
        result = list(self)
        for field in reversed(fields):
            reverse = field.startswith("-")
            name = field.removeprefix("-")
            result.sort(key=lambda component: getattr(component, name), reverse=reverse)
        return _PayrollComponentCollection(result)

    def values_list(self, field, *, flat=False):
        values = [getattr(component, field) for component in self]
        return values if flat else [(value,) for value in values]


class PayrollComponent:
    """Compatibility facade over the code registry; this is not a database model."""

    class _Manager:
        def all(self):
            return get_payroll_components()

        def get(self, **criteria):
            return self.all().get(**criteria)

        def filter(self, **criteria):
            return self.all().filter(**criteria)

        def exclude(self, **criteria):
            return self.all().exclude(**criteria)

        def order_by(self, *fields):
            return self.all().order_by(*fields)

    objects = _Manager()


def get_payroll_components(period=None) -> _PayrollComponentCollection:
    """Return built-ins plus active user-created component columns."""

    from finance.models import PayrollCustomComponent

    custom = list(
        PayrollCustomComponent.objects.filter(is_active=True)
        .select_related("scope_period")
        .order_by("display_order", "name", "id")
    )
    if period is not None:
        custom = [component for component in custom if component.applies_to_period(period)]
    return _PayrollComponentCollection((*PAYROLL_COMPONENTS, *custom))


def get_payroll_component(code: str, *, period=None) -> PayrollComponentDefinition:
    component = PAYROLL_COMPONENTS_BY_CODE.get(code)
    if component is not None:
        return component

    from finance.models import PayrollCustomComponent

    component = (
        PayrollCustomComponent.objects.filter(code=code, is_active=True)
        .select_related("scope_period")
        .first()
    )
    if component is not None and (
        period is None or component.applies_to_period(period)
    ):
        return component
    raise ValueError(f"Неизвестный вид зарплатной операции: {code}")