use argon2::{
    password_hash::{rand_core::OsRng, PasswordHash, PasswordHasher, PasswordVerifier, SaltString},
    Argon2,
};
use uuid::Uuid;

fn create_user(username: &str, password: &[u8]) -> Result<Uuid, CreateUserError> {
    // Argon2 with default params (Argon2id v19)
    let argon2 = Argon2::default();

    let salt = SaltString::generate(&mut OsRng);
    let password_hash = argon2
        .hash_password(password, &salt)
        .unwrap() // safe to unwrap, we know the salt is valid
        .to_string();

    todo!()
}

#[Error(desc = "Could not create user.")]
#[non_exhaustive]
pub struct CreateUserError(#[from] CreateUserErrorKind);

#[Error]
#[non_exhaustive]
pub enum CreateUserErrorKind {
    AlreadyExists,
    PasswordMismatch,
    MissingFields,
    Unknown,
}