use super::cedar_authorizer::CedarAuthorizer;
use super::check_service::CheckService;
use envoy_types::ext_authz::v3::pb::AuthorizationServer;
use std::sync::Arc;

pub struct Server {
    router: tonic::transport::server::Router,
}

impl Server {
    pub fn new<T: super::Authorizer>(authorizer: T) -> Result<Server, Box<dyn std::error::Error>> {
        let (health_reporter, health_service) = tonic_health::server::health_reporter();
        std::mem::drop(
            health_reporter.set_service_status("", tonic_health::ServingStatus::Serving),
        );
        let authorization_service =
            AuthorizationServer::new(CheckService::new(Arc::new(authorizer)));

        let reflection_service = tonic_reflection::server::Builder::configure()
            .register_encoded_file_descriptor_set(tonic_health::pb::FILE_DESCRIPTOR_SET)
            .register_encoded_file_descriptor_set(include_bytes!(
                "../../vendor/envoy-types/src/generated/types.bin"
            ))
            .build_v1()?;

        Ok(Self::new_with(|mut builder| {
            builder
                .add_service(authorization_service)
                .add_service(health_service)
                .add_service(reflection_service)
        }))
    }

    pub fn new_with<F>(f: F) -> Server
    where
        F: FnOnce(tonic::transport::Server) -> tonic::transport::server::Router,
    {
        let builder = tonic::transport::Server::builder()
            .trace_fn(
                |req| tracing::info_span!("rpc", method = %req.method(), path = %req.uri().path()),
            )
            .timeout(std::time::Duration::from_secs(30));
        let router = f(builder);
        Server { router }
    }

    pub async fn serve(self, addr: std::net::SocketAddr) -> Result<(), tonic::transport::Error> {
        self.router.serve(addr).await
    }
}

impl Default for Server {
    fn default() -> Self {
        Self::new(CedarAuthorizer::default()).unwrap()
    }
}