use crate::database_client::DatabaseClientTrait;
use crate::database::GetUserResponse;

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

pub fn hash_password(password: &str) -> String {
    let salt = SaltString::generate(&mut OsRng);
    let argon2 = Argon2::default();
    argon2.hash_password(password.as_ref(), &salt).unwrap().to_string()
}

pub fn verify_password(password: &str, hash: &str) -> bool {
    let parsed_hash = PasswordHash::new(&hash).unwrap();
    Argon2::default().verify_password(password.as_bytes(), &parsed_hash).is_ok()
}

pub async fn verify_user<T: DatabaseClientTrait>(mut db_client: T,
                         username: &str, password: &str) -> Option<GetUserResponse> {
    let user = db_client.get_user_by_username(username).await.ok()?;

    if verify_password(password, &user.hashed_password) {
        Some(user)
    } else {
        None
    }
}