"""
Authentication Service for user queries.
Local registration, login, and token refresh have been removed.
All authentication now goes through SSO (see oauth_service.py).
"""
from database import get_db_connection
from models import User
from fastapi import HTTPException, status


class AuthService:
    """Service for user query operations."""

    @staticmethod
    def get_current_user(user_id: str) -> User:
        """
        Get user by ID.

        Args:
            user_id: User unique identifier

        Returns:
            User object

        Raises:
            HTTPException: 404 if user not found
        """
        with get_db_connection() as conn:
            cursor = conn.cursor()
            cursor.execute(
                "SELECT * FROM users WHERE id = ?",
                (user_id,)
            )
            row = cursor.fetchone()

            if not row:
                raise HTTPException(
                    status_code=status.HTTP_404_NOT_FOUND,
                    detail="用户不存在"
                )

            return User.from_row(row)