from datetime import datetime, timezone
from typing import Optional

from sqlalchemy import BigInteger, DateTime, String
from sqlalchemy.orm import Mapped, mapped_column

from app.db import Base


class File(Base):
    __tablename__ = "files"

    id: Mapped[str] = mapped_column(String(64), primary_key=True)
    tenant_id: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
    uploaded_by: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
    bucket: Mapped[str] = mapped_column(String(100), nullable=False)
    object_key: Mapped[str] = mapped_column(String(500), nullable=False)
    file_name: Mapped[str] = mapped_column(String(255), nullable=False)
    mime_type: Mapped[str] = mapped_column(String(100), nullable=False)
    file_size: Mapped[int] = mapped_column(BigInteger, nullable=False)
    file_hash: Mapped[str] = mapped_column(String(128), nullable=False)
    file_type: Mapped[str] = mapped_column(String(50), nullable=False)  # contract / report / knowledge_doc
    status: Mapped[str] = mapped_column(String(20), default="active")
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc))