from datetime import datetime

from sqlalchemy import Column, Integer, String, DateTime, ForeignKey, Text
from sqlalchemy.orm import relationship

from app.database import Base


class Quiz(Base):
    __tablename__ = "quizzes"

    id = Column(Integer, primary_key=True, index=True)
    section_id = Column(Integer, ForeignKey("sections.id"), nullable=False)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    title = Column(String, nullable=False)
    questions_count = Column(Integer, default=0)
    time_limit_minutes = Column(Integer, nullable=True)  # null = no limit
    mode = Column(String, default="timed")  # timed, learning
    skipped_questions = Column(Text, nullable=True)  # JSON list of skipped question texts
    created_at = Column(DateTime, default=datetime.utcnow)

    section = relationship("Section", back_populates="quizzes")
    user = relationship("User", back_populates="quizzes")
    questions = relationship("Question", back_populates="quiz", cascade="all, delete-orphan")
    attempts = relationship("QuizAttempt", back_populates="quiz", cascade="all, delete-orphan")
    reminders = relationship("ReminderSchedule", cascade="all, delete-orphan", foreign_keys="ReminderSchedule.quiz_id")