from datetime import datetime

from sqlalchemy import Column, Integer, String, DateTime, ForeignKey
from sqlalchemy.orm import relationship

from app.database import Base


class PDFDocument(Base):
    __tablename__ = "pdf_documents"

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    filename = Column(String, nullable=False)
    original_filename = Column(String, nullable=False)
    total_pages = Column(Integer, nullable=True)
    status = Column(String, default="processing")  # processing, ready, error
    error_message = Column(String, nullable=True)
    uploaded_at = Column(DateTime, default=datetime.utcnow)

    user = relationship("User", back_populates="documents")
    sections = relationship("Section", back_populates="document", cascade="all, delete-orphan")