//! # Database connection management

use crate::app_config::AppConfig;
use diesel::{Connection, PgConnection};
use std::cell::RefCell;
thread_local! {
    static POSTGRES_CONNECTION: RefCell<Option<PgConnection>> = RefCell::new(None);
}

/// Execute a request on the database
pub fn execute<E, I>(cb: E) -> anyhow::Result<I>
where
    E: FnOnce(&mut PgConnection) -> anyhow::Result<I>,
{
    // Establish connection if required
    if POSTGRES_CONNECTION.with(|i| i.borrow().is_none()) {
        let database_url = AppConfig::get().db_connection_chain();
        let conn = PgConnection::establish(&database_url)
            .unwrap_or_else(|_| panic!("Error connecting to {}", database_url));

        POSTGRES_CONNECTION.with(|i| *i.borrow_mut() = Some(conn))
    }

    POSTGRES_CONNECTION.with(|i| cb(i.borrow_mut().as_mut().unwrap()))
}