from datetime import datetime

from sqlalchemy import BigInteger, Boolean, DateTime, ForeignKey, String
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.models.base import Base, utcnow
from app.models.user import User


class Attachment(Base):
    __tablename__ = "attachments"

    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
    ncr_id: Mapped[int] = mapped_column(ForeignKey("ncrs.id", ondelete="CASCADE"))
    original_filename: Mapped[str] = mapped_column(String(255))
    # Relative path under ATTACHMENTS_DIR: "<ncr_id>/<uuid><ext>"
    stored_path: Mapped[str] = mapped_column(String(300), unique=True)
    content_type: Mapped[str] = mapped_column(String(100))
    size_bytes: Mapped[int] = mapped_column(BigInteger)
    is_image: Mapped[bool] = mapped_column(Boolean, default=False)
    uploaded_by_id: Mapped[int] = mapped_column(ForeignKey("users.id"))
    uploaded_at: Mapped[datetime] = mapped_column(DateTime, default=utcnow)

    ncr = relationship("Ncr", back_populates="attachments")
    uploaded_by: Mapped[User] = relationship(lazy="selectin")