use sqlx::{Connection, Executor, PgConnection, PgPool};
use tokio::net::TcpListener;
use uuid::Uuid;
use zero2prod::configuration::{DatabaseSettings, get_configuration};

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

#[tokio::test]
async fn health_check_works() {
    let app = spawn_app().await;
    let client = reqwest::Client::new();

    let response = client
        .get(format!("http://{}/health_check", app.address))
        .send()
        .await
        .unwrap();

    assert!(response.status().is_success());
    assert_eq!(Some(0), response.content_length());
}

#[tokio::test]
async fn subscribe_returns_a_200_for_valid_form_data() {
    let app = spawn_app().await;
    let configuration = get_configuration().expect("Failed to read configuration");
    let connection_string = configuration.database.connection_string();
    let mut connection = PgConnection::connect(&connection_string)
        .await
        .expect("Failed to connect to Postgres");
    let client = reqwest::Client::new();

    let body = "name=alphonse&email=alphonse.paix%40outlook.com";
    let response = client
        .post(format!("http://{}/subscriptions", app.address))
        .header("Content-Type", "application/x-www-form-urlencoded")
        .body(body)
        .send()
        .await
        .unwrap();

    assert_eq!(200, response.status().as_u16());

    let saved = sqlx::query!("SELECT email, name FROM subscriptions")
        .fetch_one(&mut connection)
        .await
        .expect("Failed to fetch saved subscription");

    assert_eq!(saved.email, "alphonse.paix@outlook.com");
    assert_eq!(saved.name, "alphonse");
}

#[tokio::test]
async fn subscribe_returns_a_422_when_data_is_missing() {
    let app = spawn_app().await;
    let client = reqwest::Client::new();

    let test_cases = [
        ("name=Alphonse", "missing the email"),
        ("email=alphonse.paix%40outlook.com", "missing the name"),
        ("", "missing both name and email"),
    ];
    for (invalid_body, error_message) in test_cases {
        let response = client
            .post(format!("http://{}/subscriptions", app.address))
            .header("Content-Type", "application/x-www-form-urlencoded")
            .body(invalid_body)
            .send()
            .await
            .unwrap();

        assert_eq!(
            422,
            response.status().as_u16(),
            "the API did not fail with 422 Unprocessable Entity when the payload was {}.",
            error_message
        );
    }
}

async fn spawn_app() -> TestApp {
    let listener = TcpListener::bind("127.0.0.1:0").await.unwrap();
    let address = listener.local_addr().unwrap().to_string();

    let mut configuration = get_configuration().expect("Failed to read configuration");
    configuration.database.database_name = Uuid::new_v4().to_string();
    let connection_pool = configure_database(&configuration.database).await;

    let app = TestApp {
        address,
        connection_pool: connection_pool.clone(),
    };

    tokio::spawn(async move {
        zero2prod::startup::run(listener, connection_pool).await;
    });

    app
}

async fn configure_database(config: &DatabaseSettings) -> PgPool {
    let connection = PgPool::connect(&config.connection_string_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(&config.connection_string())
        .await
        .expect("Failed to connect to Postgres");
    sqlx::migrate!("./migrations")
        .run(&connection_pool)
        .await
        .expect("Failed to migrate the database");

    connection_pool
}