from __future__ import annotations

from datetime import datetime

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

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


class StudentWeakTopic(Base):
    __tablename__ = "student_weak_topics"

    id: Mapped[str] = mapped_column(
        String(40),
        primary_key=True,
        default=lambda: prefixed_id("wt"),
    )
    user_id: Mapped[str] = mapped_column(
        String(40),
        ForeignKey("users.id", ondelete="CASCADE"),
        index=True,
        nullable=False,
    )
    topic_name: Mapped[str] = mapped_column(String(255), index=True, nullable=False)
    subject: Mapped[str | None] = mapped_column(String(255), nullable=True)
    frequency: Mapped[int] = mapped_column(Integer, default=1, nullable=False)
    weak_topic_score: Mapped[float] = mapped_column(Float, default=0.2, nullable=False)
    topic_attempt_count: Mapped[int] = mapped_column(Integer, default=1, nullable=False)
    topic_confidence: Mapped[float] = mapped_column(Float, default=0.5, nullable=False)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        nullable=False,
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        onupdate=func.now(),
        nullable=False,
    )