"""Child-Parent junction table for many-to-many relationship."""

from typing import TYPE_CHECKING
from sqlalchemy import Column, Integer, ForeignKey, DateTime
from datetime import datetime

if TYPE_CHECKING:
    from sqlalchemy.orm import DeclarativeBase

    Base = DeclarativeBase
else:
    from baby_monitor.repositories.dependencies.get_database import Base


class ChildParent(Base):
    """Junction table linking children to their parents (users)."""

    __tablename__ = "child_parents"

    id = Column(Integer, primary_key=True, index=True)
    child_id = Column(Integer, ForeignKey("children.id"), nullable=False)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)

    def __repr__(self) -> str:
        return (
            f"<ChildParent(id={self.id}, "
            f"child_id={self.child_id}, user_id={self.user_id})>"
        )