use once_cell::sync::Lazy;
use sqlx::{Connection, Executor, PgConnection, PgPool};
use uuid::Uuid;
use zero2prod::{
    configuration::{DatabaseSettings, get_configuration},
    startup::Application,
    telemetry::init_subscriber,
};

static TRACING: Lazy<()> = Lazy::new(|| {
    if std::env::var("TEST_LOG").is_ok() {
        init_subscriber(std::io::stdout);
    } else {
        init_subscriber(std::io::sink);
    }
});

pub struct TestApp {
    pub address: String,
    pub connection_pool: PgPool,
}

impl TestApp {
    pub async fn spawn() -> Self {
        Lazy::force(&TRACING);

        let mut configuration = get_configuration().expect("Failed to read configuration");
        configuration.database.database_name = Uuid::new_v4().to_string();
        configuration.application.port = 0;
        let connection_pool = configure_database(&configuration.database).await;
        let application = Application::build(configuration)
            .await
            .expect("Failed to build application");
        let address = application.address();
        let app = TestApp {
            address,
            connection_pool,
        };

        tokio::spawn(application.run_until_stopped());

        app
    }

    pub async fn post_subscriptions(&self, body: String) -> reqwest::Response {
        reqwest::Client::new()
            .post(format!("http://{}/subscriptions", self.address))
            .header("Content-Type", "application/x-www-form-urlencoded")
            .body(body)
            .send()
            .await
            .expect("Failed to execute request")
    }
}

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_ref())
        .await
        .expect("Failed to create the database");

    let connection_pool = PgPool::connect_with(config.with_db())
        .await
        .expect("Failed to connect to Postgres");
    sqlx::migrate!("./migrations")
        .run(&connection_pool)
        .await
        .expect("Failed to migrate the database");

    connection_pool
}