from typing import Optional
from datetime import datetime, timezone

from sqlalchemy import Column, String, Text, Integer, Float, DateTime, Boolean, JSON, func
from sqlalchemy.orm import Mapped, mapped_column

from app.models.user import Base


class Question(Base):
    __tablename__ = "questions"

    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
    question_id: Mapped[str] = mapped_column(String(64), unique=True, nullable=False, index=True)
    question_type: Mapped[str] = mapped_column(String(8), nullable=False)  # A / B / X
    subject: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
    chapter_id: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
    difficulty: Mapped[int] = mapped_column(default=1)  # 1-5
    content: Mapped[str] = mapped_column(Text, nullable=False)
    options: Mapped[list] = mapped_column(JSON, nullable=False)
    answer: Mapped[str] = mapped_column(String(16), nullable=False)
    explanation: Mapped[str] = mapped_column(Text, nullable=False)
    knowledge_point_ids: Mapped[Optional[list]] = mapped_column(JSON)
    source: Mapped[Optional[str]] = mapped_column(Text)
    frequency: Mapped[Optional[str]] = mapped_column(String(16))
    audited: Mapped[bool] = mapped_column(default=False)
    correct_count: Mapped[int] = mapped_column(default=0)
    attempt_count: Mapped[int] = mapped_column(default=0)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now()
    )