from datetime import datetime

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

from app.db.base import Base, TimestampMixin


class PolicyDocument(Base, TimestampMixin):
    __tablename__ = "policy_documents"

    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
    policy_id: Mapped[int] = mapped_column(ForeignKey("policies.id"), nullable=False, index=True)
    storage_path: Mapped[str] = mapped_column(String(500), nullable=False)
    original_filename: Mapped[str] = mapped_column(String(255), nullable=False)
    file_size: Mapped[int] = mapped_column(BigInteger, nullable=False)
    mime_type: Mapped[str] = mapped_column(String(100), default="application/pdf", nullable=False)
    checksum: Mapped[str] = mapped_column(String(64), nullable=False)
    version: Mapped[int] = mapped_column(Integer, default=1, nullable=False)
    uploaded_by: Mapped[int | None] = mapped_column(ForeignKey("users.id"))
    uploaded_at: Mapped[datetime] = mapped_column(nullable=False)

    policy: Mapped["Policy"] = relationship(back_populates="documents")


from app.models.policy import Policy  # noqa: E402