use argon2::{password_hash::SaltString, Argon2, PasswordHasher};
use serde::Serialize;
use sqlx::{FromRow, SqlitePool};

#[derive(FromRow, Debug, Serialize)]
pub struct User {
    id: i64,
    name: String,
    pw: String,
    is_cox: bool,
    is_admin: bool,
    is_guest: bool,
}

#[derive(Debug)]
pub enum LoginError {
    SqlxError(sqlx::Error),
    InvalidAuthenticationCombo,
}

impl From<sqlx::Error> for LoginError {
    fn from(sqlx_error: sqlx::Error) -> Self {
        Self::SqlxError(sqlx_error)
    }
}
impl User {
    async fn find_by_name(db: &SqlitePool, name: String) -> Result<Self, sqlx::Error> {
        let user: User = sqlx::query_as!(
            User,
            "
SELECT id, name, pw, is_cox, is_admin, is_guest
FROM user 
WHERE name like ?
        ",
            name
        )
        .fetch_one(db)
        .await?;

        Ok(user)
    }

    pub async fn login(db: &SqlitePool, name: String, pw: String) -> Result<Self, LoginError> {
        let user = User::find_by_name(db, name).await?;

        let salt = SaltString::from_b64("dS/X5/sPEKTj4Rzs/CuvzQ").unwrap();
        let argon2 = Argon2::default();
        let password_hash = argon2
            .hash_password(&pw.as_bytes(), &salt)
            .unwrap()
            .to_string();

        if password_hash == user.pw {
            return Ok(user);
        }

        Err(LoginError::InvalidAuthenticationCombo)
    }
}

#[cfg(test)]
mod test {
    use super::User;
    use sqlx::SqlitePool;

    async fn setup() -> SqlitePool {
        let pool = SqlitePool::connect(":memory:").await.unwrap();
        sqlx::query_file!("./migration.sql")
            .execute(&pool)
            .await
            .unwrap();
        sqlx::query_file!("./seeds.sql")
            .execute(&pool)
            .await
            .unwrap();

        pool
    }

    #[sqlx::test]
    fn succ_login_with_test_db() {
        let pool = setup().await;
        User::login(&pool, "admin".into(), "admin".into())
            .await
            .unwrap();
    }

    #[sqlx::test]
    fn wrong_pw() {
        let pool = setup().await;
        assert!(User::login(&pool, "admin".into(), "admi".into())
            .await
            .is_err());
    }

    #[sqlx::test]
    fn wrong_username() {
        let pool = setup().await;
        assert!(User::login(&pool, "admi".into(), "admin".into())
            .await
            .is_err());
    }
}