"""Image database model."""

from datetime import datetime, timezone
from typing import TYPE_CHECKING
from uuid import UUID, uuid4

from sqlalchemy import BigInteger, DateTime, ForeignKey, Integer, String
from sqlalchemy.dialects.postgresql import JSONB
from sqlalchemy.dialects.postgresql import UUID as PGUUID
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.database.base import Base

if TYPE_CHECKING:
    from app.database.models.board_image import BoardImage
    from app.database.models.user import User


class Image(Base):
    """
    Image model representing uploaded image files.

    Images are stored in MinIO and can be reused across multiple boards.
    Reference counting tracks how many boards use each image.
    """

    __tablename__ = "images"

    id: Mapped[UUID] = mapped_column(PGUUID(as_uuid=True), primary_key=True, default=uuid4)
    user_id: Mapped[UUID] = mapped_column(
        PGUUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False
    )
    filename: Mapped[str] = mapped_column(String(255), nullable=False)
    storage_path: Mapped[str] = mapped_column(String(512), nullable=False)
    file_size: Mapped[int] = mapped_column(BigInteger, nullable=False)
    mime_type: Mapped[str] = mapped_column(String(100), nullable=False)
    width: Mapped[int] = mapped_column(Integer, nullable=False)
    height: Mapped[int] = mapped_column(Integer, nullable=False)
    image_metadata: Mapped[dict] = mapped_column(JSONB, nullable=False)

    created_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, default=lambda: datetime.now(timezone.utc))
    reference_count: Mapped[int] = mapped_column(Integer, nullable=False, default=0)

    # Relationships
    user: Mapped["User"] = relationship("User", back_populates="images")
    board_images: Mapped[list["BoardImage"]] = relationship(
        "BoardImage", back_populates="image", cascade="all, delete-orphan"
    )

    def __repr__(self) -> str:
        """String representation of Image."""
        return f"<Image(id={self.id}, filename='{self.filename}', user_id={self.user_id})>"