from datetime import datetime
from typing import Any

from sqlalchemy import DateTime, ForeignKey, JSON, String, func
from sqlalchemy.orm import Mapped, mapped_column

from app.core.database import Base
from app.utils.ids import prefixed_id


class FlashcardSet(Base):
    __tablename__ = "flashcard_sets"

    id: Mapped[str] = mapped_column(
        String(40),
        primary_key=True,
        default=lambda: prefixed_id("flash"),
    )
    user_id: Mapped[str] = mapped_column(
        String(40),
        ForeignKey("users.id"),
        index=True,
        nullable=False,
    )
    document_id: Mapped[str] = mapped_column(
        String(40),
        ForeignKey("documents.id"),
        index=True,
        nullable=False,
    )
    cards_json: Mapped[dict[str, Any]] = mapped_column(JSON, nullable=False)
    model_used: Mapped[str] = mapped_column(
        String(120),
        default="mock-exam-tutor-v1",
        nullable=False,
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        nullable=False,
    )