from datetime import datetime

from sqlalchemy import Boolean, DateTime, ForeignKey, Integer, String, Text
from sqlalchemy.orm import Mapped, mapped_column, relationship
from sqlalchemy.sql import func

from app.database import Base


class Test(Base):
    __tablename__ = "tests"

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    title: Mapped[str] = mapped_column(String(255), nullable=False)
    description: Mapped[str | None] = mapped_column(Text, nullable=True)
    passing_score: Mapped[int] = mapped_column(Integer, nullable=False)
    time_limit: Mapped[int | None] = mapped_column(Integer, nullable=True)  # минуты
    allow_navigation_back: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    version: Mapped[int] = mapped_column(Integer, default=1, nullable=False)
    parent_id: Mapped[int | None] = mapped_column(
        Integer, ForeignKey("tests.id"), nullable=True
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now()
    )

    questions: Mapped[list["Question"]] = relationship(
        "Question", back_populates="test", cascade="all, delete-orphan"
    )


class Question(Base):
    __tablename__ = "questions"

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    test_id: Mapped[int] = mapped_column(Integer, ForeignKey("tests.id"), nullable=False)
    text: Mapped[str] = mapped_column(Text, nullable=False)
    order: Mapped[int] = mapped_column(Integer, nullable=False)

    test: Mapped["Test"] = relationship("Test", back_populates="questions")
    answers: Mapped[list["Answer"]] = relationship(
        "Answer", back_populates="question", cascade="all, delete-orphan"
    )


class Answer(Base):
    __tablename__ = "answers"

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    question_id: Mapped[int] = mapped_column(
        Integer, ForeignKey("questions.id"), nullable=False
    )
    text: Mapped[str] = mapped_column(Text, nullable=False)
    is_correct: Mapped[bool] = mapped_column(Boolean, nullable=False)

    question: Mapped["Question"] = relationship("Question", back_populates="answers")