"""
Read-only normalized reference rows for imported tryout questions.

These rows reflect the latest imported source version of each question and are
kept separate from operational items and AI-generated variants.
"""

from datetime import datetime
from typing import Optional

from sqlalchemy import Boolean, DateTime, ForeignKey, Integer, JSON, String, Text, UniqueConstraint, func
from sqlalchemy.orm import Mapped, mapped_column

from app.database import Base


class TryoutSnapshotQuestion(Base):
    __tablename__ = "tryout_snapshot_questions"

    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
    website_id: Mapped[int] = mapped_column(
        ForeignKey("websites.id", ondelete="CASCADE", onupdate="CASCADE"),
        nullable=False,
        index=True,
        comment="Website identifier",
    )
    source_tryout_id: Mapped[str] = mapped_column(
        String(255),
        nullable=False,
        index=True,
        comment="External source tryout identifier",
    )
    source_question_id: Mapped[str] = mapped_column(
        String(255),
        nullable=False,
        comment="External source question identifier",
    )
    latest_snapshot_id: Mapped[Optional[int]] = mapped_column(
        ForeignKey("tryout_import_snapshots.id", ondelete="SET NULL", onupdate="CASCADE"),
        nullable=True,
        index=True,
        comment="Latest snapshot containing this question",
    )
    question_title: Mapped[str] = mapped_column(
        Text,
        nullable=False,
        comment="Imported title or short label",
    )
    question_html: Mapped[str] = mapped_column(
        Text,
        nullable=False,
        comment="Imported question body HTML",
    )
    explanation_html: Mapped[Optional[str]] = mapped_column(
        Text,
        nullable=True,
        comment="Imported explanation HTML",
    )
    raw_options: Mapped[list] = mapped_column(
        JSON,
        nullable=False,
        comment="Raw source options payload",
    )
    correct_answer: Mapped[str] = mapped_column(
        String(10),
        nullable=False,
        comment="Imported correct answer key",
    )
    category_id: Mapped[Optional[int]] = mapped_column(
        Integer,
        nullable=True,
        comment="Imported category id",
    )
    category_name: Mapped[Optional[str]] = mapped_column(
        String(255),
        nullable=True,
        comment="Imported category name",
    )
    category_code: Mapped[Optional[str]] = mapped_column(
        String(255),
        nullable=True,
        comment="Imported category code",
    )
    option_count: Mapped[int] = mapped_column(
        Integer,
        nullable=False,
        default=0,
        comment="Count of source options",
    )
    has_option_labels: Mapped[bool] = mapped_column(
        Boolean,
        nullable=False,
        default=False,
        comment="Whether source options include visible labels",
    )
    is_active: Mapped[bool] = mapped_column(
        Boolean,
        nullable=False,
        default=True,
        comment="Whether question is still present in latest source import",
    )
    content_checksum: Mapped[str] = mapped_column(
        String(64),
        nullable=False,
        comment="Checksum of normalized question content",
    )
    raw_payload: Mapped[dict] = mapped_column(
        JSON,
        nullable=False,
        comment="Original source question payload",
    )
    first_seen_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        nullable=False,
        server_default=func.now(),
    )
    last_seen_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        nullable=False,
        server_default=func.now(),
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now()
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        nullable=False,
        server_default=func.now(),
        onupdate=func.now(),
    )

    __table_args__ = (
        UniqueConstraint(
            "website_id",
            "source_tryout_id",
            "source_question_id",
            name="uq_snapshot_questions_website_tryout_question",
        ),
    )