//! ActivePush - Exchange ActiveSync gateway for IMAP/SMTP + CalDAV/CardDAV (Z-Push rewrite).

pub mod admin;
pub mod app;
pub mod autodiscover;
pub mod backend;
pub mod config;
pub mod db;
pub mod eas;
pub mod logging;
pub mod metrics;
pub mod probe;
pub mod server;
pub mod tls;
pub mod util;
pub mod wbxml;
pub mod xmltree;

use std::sync::Arc;

use axum::routing::any;
use axum::Router;

/// Public (device facing) router: ActiveSync + Autodiscover. Paths match the nginx
/// locations previously routed to Z-Push.
pub fn public_router(app: Arc<app::App>) -> Router {
    Router::new()
        .route("/Microsoft-Server-ActiveSync", any(eas::handler))
        .route("/microsoft-server-activesync", any(eas::handler))
        .route("/AutoDiscover/AutoDiscover.xml", any(autodiscover::handler))
        .route("/Autodiscover/Autodiscover.xml", any(autodiscover::handler))
        .route("/autodiscover/autodiscover.xml", any(autodiscover::handler))
        .route("/healthz", axum::routing::get(healthz))
        .route("/", axum::routing::get(index))
        .fallback(not_found)
        .with_state(app)
}

async fn index() -> impl axum::response::IntoResponse {
    (
        [("Content-Type", "text/plain; charset=utf-8")],
        "ActivePush - Exchange ActiveSync endpoint.\nDevices connect to /Microsoft-Server-ActiveSync.\n",
    )
}

async fn not_found() -> impl axum::response::IntoResponse {
    (
        axum::http::StatusCode::NOT_FOUND,
        [("Content-Type", "text/plain; charset=utf-8")],
        "Not found.\n",
    )
}

/// Liveness + database check for load balancers and monitoring.
async fn healthz(
    axum::extract::State(app): axum::extract::State<Arc<app::App>>,
) -> impl axum::response::IntoResponse {
    match sqlx::query_scalar::<_, i64>("SELECT 1")
        .fetch_one(&app.db)
        .await
    {
        Ok(_) => (axum::http::StatusCode::OK, "ok\n"),
        Err(_) => (
            axum::http::StatusCode::SERVICE_UNAVAILABLE,
            "database unavailable\n",
        ),
    }
}