use std::ops::Deref;

use argon2::{password_hash::SaltString, Argon2, PasswordHash, PasswordHasher, PasswordVerifier};
use base64::{engine, prelude::BASE64_STANDARD_NO_PAD};
use rocket::{
    request::{self, FromRequest},
    Request,
};
use sqlx::{FromRow, SqlitePool};

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

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 {
    pub 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 argon2 = Argon2::default();
        let salt = SaltString::from_b64("CdR4i0HA9e0CM").unwrap(); //TODO: generate salt for each user
        let password_hash = argon2
            .hash_password(&pw.as_bytes(), &salt)
            .unwrap()
            .to_string();
        //TODO: fixme
        let parsed_hash = PasswordHash::new(&password_hash).unwrap(); //TODO: fixme

        //TODO: If user.pw == "" -> set new pw!
        match Argon2::default()
            .verify_password(base64::encode(pw.as_bytes()).as_bytes(), &parsed_hash)
        {
            Ok(_) => Ok(user),
            Err(_) => Err(LoginError::InvalidAuthenticationCombo),
        }
    }
}

pub struct Users {
    users: Vec<User>,
}

#[derive(Debug)]
pub enum Error {}

//#[rocket::async_trait]
//impl<'r> FromRequest<'r> for User {
//    type Error = Error;
//
//    async fn from_request(req: &'r Request<'_>) -> request::Outcome<Self, Self::Error> {
//        //TODO: https://betterprogramming.pub/building-the-rust-web-app-multiple-users-and-authentication-5ca5988ddfe4
//    }
//}

impl Deref for Users {
    type Target = Vec<User>;

    fn deref(&self) -> &Self::Target {
        &self.users
    }
}

impl Users {
    pub async fn new(pool: &SqlitePool) -> Result<Self, sqlx::Error> {
        let users: Vec<User> = sqlx::query_as!(
            User,
            r#"
SELECT id, name, pw, is_cox, is_admin, is_guest
FROM user 
        "#,
        )
        .fetch_all(pool)
        .await?;

        Ok(Self { users })
    }
}

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

    #[sqlx::test]
    fn user_with_test_db() {
        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();

        let users = Users::new(&pool).await.unwrap();
        assert_eq!(users.len(), 4);
    }
}