use axum::body::Body;
use axum::http::{header, StatusCode};
use axum::response::{Html, IntoResponse, Response};
use axum::Router;
use axum::routing::get;
use tokio::fs::File;
use tokio_util::io::ReaderStream;

pub fn router() -> Router {
    Router::new()
        .route("/", get(index))
        .route("/openapi", get(open_api))
}

async fn index() -> &'static str {
    "Welcome to the Simplify Truths API!\n"
}

// TODO open from target dir in release mode.
async fn open_api() -> Response {
    let file_path = "./spec/dist/index.html";
    let file = match File::open(file_path).await {
        Ok(file) => file,
        Err(err) => return (StatusCode::NOT_FOUND, format!("File not found: {err}")).into_response(),
    };
    // convert the `AsyncRead` into a `Stream`
    let stream = ReaderStream::new(file);
    // convert the `Stream` into an `axum::body::HttpBody`
    let body = Body::from_stream(stream);

    Html(body).into_response()
}