//! Run with
//!
//! ```not_rust
//! cd examples && cargo run -p example-tls-rustls
//! ```

use axum::{
    extract::Host,
    handler::Handler,
    http::{StatusCode, Uri},
    response::Redirect,
    routing::get,
    BoxError, Router,
};
use axum_server::tls_rustls::RustlsConfig;
use std::{net::SocketAddr, path::PathBuf};
use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};

#[derive(Clone, Copy)]
struct Ports {
    http: u16,
    https: u16,
}

#[tokio::main]
async fn main() {
    tracing_subscriber::registry()
        .with(tracing_subscriber::EnvFilter::new(
            std::env::var("RUST_LOG").unwrap_or_else(|_| "example_tls_rustls=debug".into()),
        ))
        .with(tracing_subscriber::fmt::layer())
        .init();

    let ports = Ports {
        http: 7878,
        https: 3000,
    };
    // optional: spawn a second server to redirect http requests to this server
    tokio::spawn(redirect_http_to_https(ports));

    // configure certificate and private key used by https
    let config = RustlsConfig::from_pem_file(
        PathBuf::from(env!("CARGO_MANIFEST_DIR"))
            .join("self_signed_certs")
            .join("cert.pem"),
        PathBuf::from(env!("CARGO_MANIFEST_DIR"))
            .join("self_signed_certs")
            .join("key.pem"),
    )
    .await
    .unwrap();

    let app = Router::new().route("/", get(handler));

    // run https server
    let addr = SocketAddr::from(([127, 0, 0, 1], ports.https));
    tracing::debug!("listening on {}", addr);
    axum_server::bind_rustls(addr, config)
        .serve(app.into_make_service())
        .await
        .unwrap();
}

async fn handler() -> &'static str {
    "Hello, World!"
}

async fn redirect_http_to_https(ports: Ports) {
    fn make_https(host: String, uri: Uri, ports: Ports) -> Result<Uri, BoxError> {
        let mut parts = uri.into_parts();

        parts.scheme = Some(axum::http::uri::Scheme::HTTPS);

        if parts.path_and_query.is_none() {
            parts.path_and_query = Some("/".parse().unwrap());
        }

        let https_host = host.replace(&ports.http.to_string(), &ports.https.to_string());
        parts.authority = Some(https_host.parse()?);

        Ok(Uri::from_parts(parts)?)
    }

    let redirect = move |Host(host): Host, uri: Uri| async move {
        match make_https(host, uri, ports) {
            Ok(uri) => Ok(Redirect::permanent(&uri.to_string())),
            Err(error) => {
                tracing::warn!(%error, "failed to convert URI to HTTPS");
                Err(StatusCode::BAD_REQUEST)
            }
        }
    };

    let addr = SocketAddr::from(([127, 0, 0, 1], ports.http));
    tracing::debug!("http redirect listening on {}", addr);

    axum::Server::bind(&addr)
        .serve(redirect.into_make_service())
        .await
        .unwrap();
}