use axum::{
    body::Body,
    http::{Method, Request, StatusCode, header},
};
use http_body_util::BodyExt;
use serde_json::{Value, json};
use tempfile::TempDir;
use tower::ServiceExt;

async fn test_app() -> (axum::Router, TempDir) {
    let temp_dir = TempDir::new().expect("temporary directory should be created");
    let pool = task_pilot_backend::database::connect("sqlite::memory:")
        .await
        .expect("test database should initialize");
    let app = task_pilot_backend::app(pool, temp_dir.path().join("logs"))
        .await
        .expect("test app should start");
    (app, temp_dir)
}

async fn auth_token(app: &axum::Router) -> String {
    let response = app
        .clone()
        .oneshot(
            Request::builder()
                .uri("/api/v1/session")
                .body(Body::empty())
                .expect("request should build"),
        )
        .await
        .expect("router should respond");
    let body = response
        .into_body()
        .collect()
        .await
        .expect("body should be readable")
        .to_bytes();
    let json: Value = serde_json::from_slice(&body).expect("session should be JSON");
    json["token"]
        .as_str()
        .expect("token should be a string")
        .to_owned()
}

async fn send(
    app: &axum::Router,
    method: Method,
    uri: &str,
    token: Option<&str>,
    body: Option<Value>,
) -> (StatusCode, Value) {
    let mut builder = Request::builder().method(method).uri(uri);
    if let Some(token) = token {
        builder = builder.header("x-taskpilot-token", token);
    }
    let request = if let Some(body) = body {
        builder
            .header(header::CONTENT_TYPE, "application/json")
            .body(Body::from(
                serde_json::to_vec(&body).expect("body should serialize"),
            ))
            .expect("request should build")
    } else {
        builder.body(Body::empty()).expect("request should build")
    };
    let response = app
        .clone()
        .oneshot(request)
        .await
        .expect("router should respond");
    let status = response.status();
    let body = response
        .into_body()
        .collect()
        .await
        .expect("body should be readable")
        .to_bytes();

    (status, serde_json::from_slice(&body).unwrap_or(Value::Null))
}

#[tokio::test]
async fn managed_env_list_returns_an_array() {
    let (app, _temp_dir) = test_app().await;

    let (status, body) = send(&app, Method::GET, "/api/v1/python/envs", None, None).await;

    assert_eq!(status, StatusCode::OK);
    assert!(body.is_array(), "envs should be an array: {body}");
}

#[tokio::test]
async fn managed_env_create_validates_input() {
    let (app, _temp_dir) = test_app().await;
    let token = auth_token(&app).await;

    let (status, body) = send(
        &app,
        Method::POST,
        "/api/v1/python/envs",
        Some(&token),
        Some(json!({ "name": "../escape" })),
    )
    .await;
    assert_eq!(status, StatusCode::BAD_REQUEST);
    assert_eq!(body["field"], "name");

    let (status, body) = send(
        &app,
        Method::POST,
        "/api/v1/python/envs",
        Some(&token),
        Some(json!({ "name": "data-science", "python_version": "latest" })),
    )
    .await;
    assert_eq!(status, StatusCode::BAD_REQUEST);
    assert_eq!(body["field"], "python_version");

    let (status, body) = send(
        &app,
        Method::POST,
        "/api/v1/python/envs",
        Some(&token),
        Some(json!({ "name": "data-science", "packages": ["--index-url=http://x"] })),
    )
    .await;
    assert_eq!(status, StatusCode::BAD_REQUEST);
    assert_eq!(body["field"], "packages");
}

#[tokio::test]
async fn missing_managed_env_returns_not_found() {
    let (app, _temp_dir) = test_app().await;
    let token = auth_token(&app).await;

    let (status, body) = send(
        &app,
        Method::GET,
        "/api/v1/python/envs/absent/packages",
        None,
        None,
    )
    .await;
    assert_eq!(status, StatusCode::NOT_FOUND);
    assert_eq!(body["code"], "ENV_NOT_FOUND");

    let (status, body) = send(
        &app,
        Method::DELETE,
        "/api/v1/python/envs/absent",
        Some(&token),
        None,
    )
    .await;
    assert_eq!(status, StatusCode::NOT_FOUND);
    assert_eq!(body["code"], "ENV_NOT_FOUND");
}

#[tokio::test]
async fn managed_env_mutations_require_token() {
    let (app, _temp_dir) = test_app().await;

    let (status, body) = send(
        &app,
        Method::POST,
        "/api/v1/python/envs",
        None,
        Some(json!({ "name": "no-token" })),
    )
    .await;

    assert_eq!(status, StatusCode::FORBIDDEN);
    assert_eq!(body["code"], "FORBIDDEN");
}