use chrono::format;
use once_cell::sync::Lazy;
use reqwest::{Client, Response};
use sqlx::{Connection, Executor, PgConnection, PgPool};
use uuid::Uuid;
use zero2prod::{
    config::{get_config, DatabaseSettings},
    startup::{get_connection_pool, Application},
    telemetry::{get_subscriber, init_subscriber},
};

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 address: String,
    pub pool: PgPool,
}

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

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

    let config = {
        let mut c = get_config().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.clone())
        .await
        .expect("Failed to build application.");

    let address = format!("http://127.0.0.1:{}", application.port());
    let _ = tokio::spawn(application.run_until_stopped());

    TestApp {
        address,
        pool: get_connection_pool(&config.database),
    }
}

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
}