"""Authentication utilities."""
from __future__ import annotations

from functools import wraps

from flask import redirect, session, url_for


def login_required(f):
    """Decorator to require login for routes."""
    @wraps(f)
    def decorated_function(*args, **kwargs):
        if not session.get("logged_in"):
            return redirect(url_for("auth.login"))
        return f(*args, **kwargs)
    return decorated_function