mod admin_examples;
mod db;
mod embed;
mod howto;
mod state;

use crate::state::AppState;
use admin_examples::static_repository;
use admin_examples::user_repository;
use admin_examples::file_repository;
use axum::{
    body::Bytes,
    extract::MatchedPath,
    http::{HeaderMap, Request},
    response::Response,
};
use axum::{
    extract::State, handler::HandlerWithoutStateExt, response::IntoResponse, routing::get, Router,
};
use dotenvy::dotenv;
use log::info;
use rear::admin;
use rear::service::{handlers, templates};
use std::env;
use std::net::SocketAddr;
use std::sync::Arc;
use std::time::Duration;
use tokio::net::TcpListener;
use tower_http::{classify::ServerErrorsFailureClass, trace::TraceLayer};
use tracing::{info_span, Span};

async fn home(templates: State<templates::Templates>) -> impl IntoResponse {
    templates.render_html("index.html", ())
}

async fn hello_world(templates: State<templates::Templates>) -> impl IntoResponse {
    templates.render_html("hello_world.html", ())
}

#[tokio::main]
async fn main() {
    // Load environment
    dotenv().ok();
    env_logger::init();
    info!("Miniweb starting...");

    // Database Configuration.
    let db_connection = db::establish_connection().await;

    // Prepare Application State Members
    let tmpl = templates::Templates::initialize().expect("Template Engine could not be loaded.");
    let mut admin = admin::state::AdminRegistry::new("admin");

    // Register Admin Apps
    static_repository::register(&mut admin);
    user_repository::register(&mut admin, db_connection);
    file_repository::register(&mut admin, "static/admin");

    // Create global Application State.
    let state: AppState = AppState {
        templates: tmpl,
        admin: Arc::new(admin),
    };

    // Application Route
    let app = Router::new()
        .route("/", get(home))
        .route("/hello", get(hello_world))
        //.merge(admin_router)
        .nest("/admin", admin::routes())
        .nest("/howto", howto::routes())
        .route_service("/static/*file", embed::static_handler.into_service())
        .fallback(handlers::not_found_handler)
        .with_state(state)
        .layer(
            TraceLayer::new_for_http()
                .make_span_with(|request: &Request<_>| {
                    // Log the matched route's path (with placeholders not filled in).
                    // Use request.uri() or OriginalUri if you want the real path.
                    let matched_path = request
                        .extensions()
                        .get::<MatchedPath>()
                        .map(MatchedPath::as_str);
                    info_span!(
                        "http_request",
                        method = ?request.method(),
                        uri = ?request.uri(),
                        matched_path,
                        some_other_field = tracing::field::Empty,
                    )
                })
                .on_request(|_request: &Request<_>, _span: &Span| {
                    // You can use `_span.record("some_other_field", value)` in one of these
                    // closures to attach a value to the initially empty field in the info_span
                    // created above.
                    info!("Request: {:?}", _request);
                })
                .on_response(|_response: &Response, _latency: Duration, _span: &Span| {
                    // ...
                    info!("Response: {:?}", _response);
                })
                .on_body_chunk(|_chunk: &Bytes, _latency: Duration, _span: &Span| {
                    // ...
                })
                .on_eos(
                    |_trailers: Option<&HeaderMap>, _stream_duration: Duration, _span: &Span| {
                        // ...
                    },
                )
                .on_failure(
                    |_error: ServerErrorsFailureClass, _latency: Duration, _span: &Span| {
                        // ...
                    },
                ),
        );

    // Run Server
    let app_host: std::net::IpAddr = env::var("APP_HOST")
        .unwrap_or("0.0.0.0".to_string())
        .parse()
        .expect("IP Address expected in APP_HOST");
    let app_port: u16 = env::var("APP_PORT")
        .unwrap_or("3000".to_string())
        .parse()
        .expect("Port expected in APP_PORT");

    // the listen_addr is the address we bind to. This might be multiple domains, like 0.0.0.0
    let listen_addr = SocketAddr::from((app_host, app_port));
    // the server addr is a concrete address the user can connect to.
    let server_addr = if app_host.is_unspecified() {
        SocketAddr::from(([127, 0, 0, 1], app_port))
    } else {
        listen_addr.clone()
    };

    info!("listening on {}", listen_addr);
    info!("admin on: http://{}/admin", server_addr);

    let listener = TcpListener::bind(&listen_addr)
        .await
        .expect("Could not bind TCP Listener.");

    axum::serve(listener, app.into_make_service())
        .with_graceful_shutdown(shutdown_signal())
        .await
        .expect("Could not start serving Axum");
}

async fn shutdown_signal() {
    let ctrl_c = async {
        tokio::signal::ctrl_c()
            .await
            .expect("failed to install Ctrl+C handler");
    };

    #[cfg(unix)]
    let terminate = async {
        tokio::signal::unix::signal(tokio::signal::unix::SignalKind::terminate())
            .expect("failed to install signal handler")
            .recv()
            .await;
    };

    #[cfg(not(unix))]
    let terminate = std::future::pending::<()>();

    tokio::select! {
        _ = ctrl_c => {},
        _ = terminate => {},
    }

    info!("shutting down...");
}