from __future__ import annotations

from datetime import datetime
from typing import TYPE_CHECKING

from sqlalchemy import Boolean, DateTime, ForeignKey, Integer, String, Table
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship

Base = DeclarativeBase()

if TYPE_CHECKING:
    from .image import Image

collection_images = Table(
    "collection_images",
    Base.metadata,
    mapped_column(
        "collection_id", Integer, ForeignKey("collections.id"), primary_key=True
    ),
    mapped_column("image_id", Integer, ForeignKey("images.id"), primary_key=True),
)


class Collection(Base):
    __tablename__ = "collections"

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    user_id: Mapped[int] = mapped_column(ForeignKey("users.id"), nullable=False)
    name: Mapped[str] = mapped_column(String(100), nullable=False)
    description: Mapped[str | None] = mapped_column(String(500), nullable=True)
    is_private: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), default=datetime.utcnow
    )

    images: Mapped[list["Image"]] = relationship(
        "Image",
        secondary=collection_images,
        back_populates="collections",
    )