use std::net::{SocketAddr, TcpListener};

struct TestApp {
    addr: SocketAddr,
}

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

    // Act
    let client = reqwest::Client::new();
    let response = client
        .get(format!("http://{addr}/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 { addr, .. } = spawn_app().await;
    let client = reqwest::Client::new();

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

        // Assert
        assert_eq!(
            400,
            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").expect("Failed to bind to random port");
    let addr = listener.local_addr().unwrap();
    let server = learn_axum::run(listener).expect("Failed to bind to address");
    tokio::spawn(server);
    TestApp { addr }
}