from __future__ import annotations

from datetime import datetime

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

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


class ChapterPattern(Base):
    __tablename__ = "chapter_patterns"

    id: Mapped[str] = mapped_column(
        String(40),
        primary_key=True,
        default=lambda: prefixed_id("cpat"),
    )
    user_id: Mapped[str] = mapped_column(
        String(40),
        index=True,
        nullable=False,
    )
    board: Mapped[str] = mapped_column(String(120), nullable=False, default="")
    class_level: Mapped[str] = mapped_column(String(60), nullable=False, default="")
    subject: Mapped[str] = mapped_column(String(120), nullable=False, default="")
    chapter: Mapped[str] = mapped_column(String(180), nullable=False, default="")
    total_questions: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    total_marks: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    repeated_topics: Mapped[list[str]] = mapped_column(JSON, default=list, nullable=False)
    answer_type_distribution: Mapped[dict[str, int]] = mapped_column(JSON, default=dict, nullable=False)
    years_seen: Mapped[list[int]] = mapped_column(JSON, default=list, nullable=False)
    confidence: Mapped[float] = mapped_column(Float, default=0.0, 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,
    )