from sqlalchemy import Column, Integer, String, Text, DateTime, JSON, ForeignKey
from sqlalchemy.orm import relationship
from sqlalchemy.sql import func
from database import Base


class Exam(Base):
    __tablename__ = "exams"

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    title = Column(String(200), nullable=False)
    subject = Column(String(50), default="")
    grade = Column(String(50), default="")
    questions = Column(JSON, default=list)
    answers = Column(JSON, default=list)
    duration = Column(Integer, default=90)
    total_score = Column(Integer, default=100)
    difficulty = Column(String(20), default="medium")
    knowledge_points = Column(JSON, default=list)
    created_at = Column(DateTime, server_default=func.now())
    updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now())