use std::sync::Arc;
use deadpool_postgres::{Pool, Config, Runtime};
use tokio::sync::OnceCell;
use tokio_postgres::NoTls;
use crate::config::get_config;

static CONNECTION_POOL: OnceCell<Arc<Pool>> = OnceCell::const_new();

async fn initialize_data() -> Arc<Pool> {
    let config = get_config().await;

    let mut pg = Config::new();
    pg.host = Some(config.database.host.clone());
    pg.user = Some(config.database.user.clone());
    pg.password = Some(config.database.password.clone());
    pg.dbname = Some(config.database.name.clone());
    pg.port = Some(config.database.port as u16);

    let pool = pg.create_pool(Some(Runtime::Tokio1), NoTls).unwrap();

    Arc::new(pool)
}

pub async fn get_connection_pool() -> Arc<Pool> {
    CONNECTION_POOL.get_or_init(initialize_data)
        .await
        .clone()
}