//! Integration tests for the BFF shell.
//!
//! These drive the [`Router`] through `tower::ServiceExt::oneshot`, which
//! exercises the real handler stack without binding a port or starting a
//! server.

use std::net::SocketAddr;
use std::path::{Path, PathBuf};

use axum::body::Body;
use axum::http::{Request, StatusCode};
use server::app::build_app;
use server::config::ServerConfig;
use server::state::AppState;
use tower::ServiceExt as _;

/// Path to the SPA build output owned by Wave 4, resolved independently of
/// the test's working directory.
fn dist_dir() -> PathBuf {
  Path::new(env!("CARGO_MANIFEST_DIR"))
    .join("..")
    .join("web")
    .join("dist")
}

/// A router built from an explicit config (no environment dependence).
fn test_app() -> axum::Router {
  let config = ServerConfig::new(SocketAddr::from(([127, 0, 0, 1], 3001)), dist_dir());
  build_app(AppState::new(config))
}

#[tokio::test]
async fn healthz_returns_200_without_binding_a_port() -> Result<(), Box<dyn std::error::Error>> {
  let response = test_app()
    .oneshot(Request::builder().uri("/healthz").body(Body::empty())?)
    .await?;

  assert_eq!(response.status(), StatusCode::OK);
  let bytes = axum::body::to_bytes(response.into_body(), usize::MAX).await?;
  let body = std::str::from_utf8(&bytes)?;
  assert!(body.contains("ok"), "unexpected health body: {body:?}");
  Ok(())
}

#[tokio::test]
async fn unknown_path_is_404_or_spa_fallback_when_dist_exists()
-> Result<(), Box<dyn std::error::Error>> {
  let response = test_app()
    .oneshot(Request::builder().uri("/nope").body(Body::empty())?)
    .await?;

  if dist_dir().join("index.html").is_file() {
    assert_eq!(
      response.status(),
      StatusCode::OK,
      "SPA fallback should serve index.html for an unknown path"
    );
  } else {
    assert_eq!(
      response.status(),
      StatusCode::NOT_FOUND,
      "without a built dist, an unknown path must be 404"
    );
  }
  Ok(())
}