from app.models import db
from flask_login import UserMixin
from werkzeug.security import generate_password_hash, check_password_hash
from datetime import datetime


class User(UserMixin, db.Model):
    __tablename__ = 'users'

    user_id = db.Column(db.Integer, primary_key=True)
    student_number = db.Column(db.String(20), unique=True, nullable=False, index=True)
    password_hash = db.Column(db.String(255), nullable=False)
    role = db.Column(db.Enum('student', 'admin'), default='student')
    is_active = db.Column(db.Boolean, default=True)
    last_login = db.Column(db.DateTime)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)

    def get_id(self):
        return str(self.user_id)

    def set_password(self, password):
        self.password_hash = generate_password_hash(password)

    def check_password(self, password):
        return check_password_hash(self.password_hash, password)

    def is_admin(self):
        return self.role == 'admin'

    def __repr__(self):
        return f'<User {self.student_number}>'