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

#[derive(Debug, sqlx::Type)]
#[sqlx(transparent)]
pub struct StoredHash(String);

impl StoredHash {
    pub fn new(password: &str) -> Result<Self, password_hash::Error> {
        let salt = SaltString::generate(&mut OsRng);
        let argon2 = Argon2::default();
        let hash = argon2
            .hash_password(password.as_bytes(), &salt)?
            .to_string();
        Ok(Self(hash))
    }

    pub fn verify(&self, password: &str) -> Result<bool, password_hash::Error> {
        let hash = PasswordHash::new(&self.0)?;

        match Argon2::default().verify_password(password.as_bytes(), &hash) {
            // Successful authentication, not an error
            Ok(()) => Ok(true),
            // Unsuccessful authentication, also not an error
            Err(password_hash::errors::Error::Password) => Ok(false),
            // Password validation failed for some other reason, treat as an error
            Err(err) => Err(err),
        }
    }
}