use julid::Julid;
use sqlx::{query_scalar, SqliteConnection, SqlitePool};

use crate::{Credit, Star, User, Watch};

//-************************************************************************
// the omega user is the system ID, but has no actual power in the app
//-************************************************************************
const OMEGA_ID: Julid = Julid::omega();

//-************************************************************************
// utility functions for building CLI tools, currently just for benchmarking
//-************************************************************************

pub async fn insert_watch(watch: Watch, db: &mut SqliteConnection) -> Julid {
    let q = "insert into watches (kind, title, length, release_date, added_by, metadata_url) values (?, ?, ?, ?, ?, ?) returning id";
    sqlx::query_scalar(q)
        .bind(watch.kind)
        .bind(watch.title)
        .bind(watch.length)
        .bind(watch.release_date)
        .bind(watch.added_by)
        .bind(watch.metadata_url)
        .fetch_one(db)
        .await
        .unwrap()
}

pub async fn insert_star(star: &Star, db: &mut SqliteConnection) -> Julid {
    let q = "insert into stars (name, metadata_url, born, died) values (?, ?, ?, ?) returning id";
    sqlx::query_scalar(q)
        .bind(&star.name)
        .bind(&star.metadata_url)
        .bind(star.born)
        .bind(star.died)
        .fetch_one(db)
        .await
        .unwrap()
}

pub async fn insert_credit(credit: &Credit, db: &mut SqliteConnection) {
    let q = "insert into credits (star, watch, credit) values (?, ?, ?)";

    sqlx::query(q)
        .bind(credit.star)
        .bind(credit.watch)
        .bind(credit.credit.as_deref())
        .execute(db)
        .await
        .unwrap();
}

pub async fn ensure_omega(db_pool: &SqlitePool) -> Julid {
    if !check_omega_exists(db_pool).await {
        User::omega().try_insert(db_pool).await.unwrap();
    }
    OMEGA_ID
}

async fn check_omega_exists(db_pool: &SqlitePool) -> bool {
    const USER_EXISTS_QUERY: &str = "select count(*) from users where id = $1";
    let count = query_scalar(USER_EXISTS_QUERY)
        .bind(OMEGA_ID)
        .fetch_one(db_pool)
        .await
        .unwrap_or(0);
    count > 0
}

//-************************************************************************
//tests
//-************************************************************************

#[cfg(test)]
mod test {
    use tokio::runtime::Runtime;

    use super::*;

    #[test]
    fn ensure_omega_user() {
        let p = crate::db::get_db_pool();
        let rt = Runtime::new().unwrap();
        rt.block_on(async {
            dbg!("checking omega");
            assert!(!check_omega_exists(&p).await);
            dbg!("no omega");
            ensure_omega(&p).await;
        });
        dbg!("maybe omega");
        assert!(rt.block_on(check_omega_exists(&p)));
    }
}