"""Calendar plugin contract — public interface for cross-plugin access."""

from __future__ import annotations

from app.plugins.builtins.calendar.models import Calendar, CalendarEntry, CalendarEntryLink


class CalendarContract:
    """Public contract for the calendar plugin."""

    Calendar = Calendar
    CalendarEntry = CalendarEntry
    CalendarEntryLink = CalendarEntryLink


_contract_instance: CalendarContract | None = None


def get_contract() -> CalendarContract:
    global _contract_instance
    if _contract_instance is None:
        _contract_instance = CalendarContract()
    return _contract_instance