from fastapi import HTTPException
from passlib.context import CryptContext
from sqlalchemy.orm import Session

from models import User
from schemas.users import UserCreate

pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")


def patch_user(db: Session, username: str, user: UserCreate):
    """Changes the username and/or the password of a User"""
    db_user = get_user_by_username(db, username)
    potential_duplicate = get_user_by_username(db, user.username)
    if potential_duplicate:
        if potential_duplicate.user_id != db_user.user_id:
            raise HTTPException(status_code=400, detail="Username already registered")

    db_user.username = user.username
    db_user.hashed_password = pwd_context.hash(user.password)
    db_user.avatar = user.avatar
    db.commit()


def get_user_by_username(db: Session, username: str):
    """Fetches a User from the database by their username"""
    return db.query(User).filter(User.username == username).first()


def get_users(db: Session):
    """Fetch a list of all users"""
    return db.query(User).all()