from sqlalchemy import Boolean, DateTime, Integer, ForeignKey, Index, func
from sqlalchemy.orm import Mapped, mapped_column, relationship
from datetime import datetime
from typing import Optional
from app.database import Base


class EventLock(Base):
    __tablename__ = "event_locks"
    __table_args__ = (Index("ix_event_locks_expires_at", "expires_at"),)

    id: Mapped[int] = mapped_column(primary_key=True, index=True)
    event_id: Mapped[int] = mapped_column(
        Integer,
        ForeignKey("calendar_events.id", ondelete="CASCADE"),
        nullable=False,
        unique=True,
    )
    locked_by: Mapped[int] = mapped_column(
        Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False
    )
    locked_at: Mapped[datetime] = mapped_column(
        DateTime, default=func.now(), server_default=func.now()
    )
    expires_at: Mapped[Optional[datetime]] = mapped_column(DateTime, nullable=True)
    is_permanent: Mapped[bool] = mapped_column(
        Boolean, default=False, server_default="false"
    )

    event: Mapped["CalendarEvent"] = relationship(lazy="selectin")
    holder: Mapped["User"] = relationship(foreign_keys=[locked_by], lazy="selectin")