"""Author RAG Chatbot SaaS — Document Model."""

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

from app.models.base import Base, TimestampMixin, generate_uuid


class Document(Base, TimestampMixin):
    """An uploaded training document associated with a book."""

    __tablename__ = "documents"

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=generate_uuid)
    author_id: Mapped[str] = mapped_column(
        String(36), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    book_id: Mapped[str] = mapped_column(
        String(36), ForeignKey("books.id", ondelete="CASCADE"), nullable=False, index=True
    )

    # File metadata
    filename: Mapped[str] = mapped_column(String(255), nullable=False)
    original_filename: Mapped[str] = mapped_column(String(255), nullable=False)
    file_extension: Mapped[str] = mapped_column(String(10), nullable=False)
    file_size_bytes: Mapped[int] = mapped_column(BigInteger, nullable=False)
    file_hash: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
    storage_path: Mapped[str] = mapped_column(String(1000), nullable=False)

    # Upload session
    upload_id: Mapped[str | None] = mapped_column(String(64), nullable=True, index=True)

    # Processing
    status: Mapped[str] = mapped_column(String(50), default="uploaded", nullable=False, index=True)
    error_message: Mapped[str | None] = mapped_column(Text, nullable=True)
    extracted_page_count: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    extracted_char_count: Mapped[int] = mapped_column(Integer, default=0, nullable=False)

    # Relationships
    author: Mapped["User"] = relationship("User", back_populates="documents")
    book: Mapped["Book"] = relationship("Book", back_populates="documents")

    def __repr__(self) -> str:
        return f"<Document id={self.id} file={self.original_filename!r} status={self.status!r}>"