import bcrypt
from db import users_collection

def signup(username, password, role):

    hashed = bcrypt.hashpw(password.encode(), bcrypt.gensalt())

    user = {
        "username": username,
        "password": hashed,
        "role": role
    }

    users_collection.insert_one(user)

    return "Signup Successful"


def login(username, password):

    user = users_collection.find_one({"username": username})

    if user and bcrypt.checkpw(password.encode(), user["password"]):
        return user["role"]

    return None