use learn_axum::configuration::get_configuration;
use sqlx::{Connection, PgConnection};
use std::net::SocketAddr;
use tokio::net::TcpListener;

struct TestApp {
    address: String,
}

#[tokio::test]
async fn health_check_works() {
    // Arrange
    let TestApp { address, .. } = spawn_app().await;

    // Act
    let client = reqwest::Client::new();
    let response = client
        .get(format!("{address}/health_check"))
        .send()
        .await
        .expect("Failed to execute request.");

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

#[tokio::test]
async fn subscribe_returns_a_200_for_valid_form_data() {
    // Arrange
    let TestApp { address } = spawn_app().await;
    let configuration = get_configuration().expect("Failed to read configuration");
    let connection_string = configuration.database.connection_string();
    // The `Connection` trait MUST be in scope for us to invoke
    // `PgConnection::connect` - it is not an inherent method of the struct!
    let connection = PgConnection::connect(&connection_string)
        .await
        .expect("Failed to connect to Postgres.");
    let client = reqwest::Client::new();

    // Act
    let body = "name=le%20guin&email=ursula_le_guin%40gmail.com";
    let response = client
        .post(&format!("{}/subscriptions", &address))
        .header("Content-Type", "application/x-www-form-urlencoded")
        .body(body)
        .send()
        .await
        .expect("Failed to execute request.");

    // Assert
    assert_eq!(200, response.status().as_u16());
}

#[tokio::test]
async fn subscribe_returns_a_400_when_data_is_missing() {
    // Arrange
    let TestApp { address, .. } = spawn_app().await;
    let client = reqwest::Client::new();
    let test_cases = vec![
        ("name=le%20guin", "missing the email"),
        ("email=ursula_le_guin%40gmail.com", "missing the name"),
        ("", "missing both name and email"),
    ];

    for (invalid_body, error_message) in test_cases {
        // Act
        let response = client
            .post(&format!("{address}/subscriptions"))
            .header("Content-Type", "application/x-www-form-urlencoded")
            .body(invalid_body)
            .send()
            .await
            .expect("Failed to execute request.");

        // Assert
        assert_eq!(
            422,
            response.status().as_u16(),
            "The API did not fail with 400 Bad Request when the payload was {}.",
            error_message
        );
    }
}

async fn spawn_app() -> TestApp {
    let listener = TcpListener::bind("127.0.0.1:0").await.unwrap();
    let address = format!("http://{}", listener.local_addr().unwrap());

    tokio::spawn(async move {
        axum::serve(listener, learn_axum::startup::app())
            .await
            .unwrap();
    });
    TestApp { address }
}