use once_cell::sync::Lazy;
use server::{
    configuration::{DatabaseSettings, get_config},
    startup::{Application, get_connection_pool},
    telemetry::{get_subscriber, init_subscriber},
};
use sqlx::{Connection, Executor, PgConnection, PgPool};
use std::{env::current_dir, net::SocketAddr};
use uuid::Uuid;

static TRACING: Lazy<()> = Lazy::new(|| {
    let default_filter_level = "trace";
    let subscriber_name = "test";

    if std::env::var("TEST_LOG").is_ok() {
        let subscriber = get_subscriber(subscriber_name, default_filter_level, std::io::stdout);
        init_subscriber(subscriber);
    } else {
        let subscriber = get_subscriber(default_filter_level, subscriber_name, std::io::sink);
        init_subscriber(subscriber);
    }
});

pub struct TestApp {
    pub _pool: PgPool,
    pub addr: SocketAddr,
}

pub async fn spawn_app() -> TestApp {
    Lazy::force(&TRACING);

    let config = {
        let path = current_dir()
            .expect("Failed to determine current directory")
            .parent()
            .map(|p| p.join("config"));
        let mut c = get_config(path).expect("Failed to read configuration.");
        c.database.database_name = Uuid::new_v4().to_string();
        c.application.port = 0;
        c
    };
    configure_database(&config.database).await;

    let application = Application::build(&config)
        .await
        .expect("Failed to build application.");
    let addr = application.addr();

    let _ = tokio::spawn(application.start()).await;

    TestApp {
        _pool: get_connection_pool(&config.database),
        addr,
    }
}

async fn configure_database(config: &DatabaseSettings) -> PgPool {
    let mut connection = PgConnection::connect_with(&config.without_db())
        .await
        .expect("Failed to connect to Postgres.");

    connection
        .execute(
            format!(
                r#"
                    CREATE DATABASE "{}"
                "#,
                config.database_name
            )
            .as_str(),
        )
        .await
        .expect("Failed to create database.");

    let pool = PgPool::connect_with(config.with_db())
        .await
        .expect("Failed to connect to Postgres.");

    sqlx::migrate!("../migrations")
        .run(&pool)
        .await
        .expect("Failed to migrate database");

    pool
}