from sqlalchemy import Column, String, Integer, Boolean, DateTime, ForeignKey, Enum
from sqlalchemy.orm import relationship
from sqlalchemy.sql import func
from core.database import Base
import uuid
from datetime import datetime

class User(Base):
    __tablename__ = "users"
    
    id = Column(String, primary_key=True, default=lambda: str(uuid.uuid4()))
    first_name = Column(String(50), nullable=False)
    last_name = Column(String(50), nullable=False)
    email = Column(String(100), unique=True, nullable=False, index=True)
    password = Column(String, nullable=False)
    role = Column(Enum('student', 'teacher', 'admin', name='user_roles'), nullable=False)
    phone_number = Column(String(20))
    address = Column(String(200))
    date_of_birth = Column(DateTime)
    profile_picture = Column(String)
    is_active = Column(Boolean, default=True)
    last_login = Column(DateTime)
    
    created_at = Column(DateTime, default=func.now())
    updated_at = Column(DateTime, default=func.now(), onupdate=func.now())
    
    courses = relationship("Course", secondary="user_courses", back_populates="users")
    assignments = relationship("Assignment", back_populates="user")
    grades = relationship("Grade", back_populates="user")
    attendance = relationship("Attendance", back_populates="user")