/*********************************************************************************
* Copyright (c) 2018,2020 ADLINK Technology Inc.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0, or the Apache Software License 2.0
* which is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
* Contributors:
*   ADLINK fog05 team, <fog05@adlink-labs.tech>
*********************************************************************************/

#![allow(clippy::manual_async_fn)]
#![allow(clippy::large_enum_variant)]

use async_std::sync::{Arc, Mutex};
use std::str;

//importing the macros
use zenoh::prelude::r#async::*;
use zrpc::zrpcresult::{ZRPCError, ZRPCResult};
use zrpc::ZServe;
use zrpc_macros::{zserver, zservice};

#[zservice(timeout_s = 60, prefix = "zrpc-tests")]
pub trait Hello {
    async fn hello(&self, name: String) -> String;
    async fn add(&mut self) -> u64;
}

#[derive(Clone)]
struct HelloZService {
    pub ser_name: String,
    pub counter: Arc<Mutex<u64>>,
}

#[zserver]
impl Hello for HelloZService {
    async fn hello(&self, name: String) -> String {
        format!("Hello {}!, you are connected to {}", name, self.ser_name)
    }

    async fn add(&mut self) -> u64 {
        let mut guard = self.counter.lock().await;
        *guard += 1;
        *guard
    }
}

fn configure_zenoh(id: ZenohId, listen: String, connect: String) -> zenoh::config::Config {
    let mut config = zenoh::config::Config::default();
    config.set_id(id).unwrap();
    config
        .set_mode(Some(zenoh::config::whatami::WhatAmI::Peer))
        .unwrap();
    config.scouting.multicast.set_enabled(Some(false)).unwrap();
    config.listen.endpoints.push(listen.parse().unwrap());
    config.connect.endpoints.push(connect.parse().unwrap());

    config
}

async fn wait_for_peer(session: &zenoh::Session, id: ZenohId) {
    while !session.info().peers_zid().res().await.any(|e| e == id) {
        async_std::task::sleep(std::time::Duration::from_secs(1)).await
    }
}

#[test]
fn service_discovery() {
    async_std::task::block_on(async {
        let server_zid = ZenohId::rand();
        let client_zid = ZenohId::rand();

        let server_config = configure_zenoh(
            server_zid,
            "tcp/127.0.0.1:9000".to_string(),
            "tcp/127.0.0.1:9001".to_string(),
        );

        let client_config = configure_zenoh(
            client_zid,
            "tcp/127.0.0.1:9001".to_string(),
            "tcp/127.0.0.1:9000".to_string(),
        );

        let server_session = Arc::new(zenoh::open(server_config).res().await.unwrap());
        let client_session = Arc::new(zenoh::open(client_config).res().await.unwrap());

        // Check zenoh sessions are connected
        wait_for_peer(&server_session, client_zid).await;
        wait_for_peer(&client_session, server_zid).await;

        let service = HelloZService {
            ser_name: "test service".to_string(),
            counter: Arc::new(Mutex::new(0u64)),
        };

        let server = service.get_hello_server(server_session, None);
        let ser_uuid = server.instance_uuid();
        let (stopper, _h) = server.connect().await.unwrap();
        server.initialize().await.unwrap();
        server.register().await.unwrap();
        let (s, handle) = server.start().await.unwrap();

        //sleep 1s for KE propagation
        async_std::task::sleep(std::time::Duration::from_secs(1)).await;

        let mut servers = HelloClient::find_servers(client_session).await.unwrap();
        assert_eq!(ser_uuid, servers.remove(0));

        server.stop(s).await.unwrap();
        server.unregister().await.unwrap();
        server.disconnect(stopper).await.unwrap();

        let _ = handle.await;
    });
}

#[test]
fn service_call() {
    async_std::task::block_on(async {
        let server_zid = ZenohId::rand();
        let client_zid = ZenohId::rand();

        let server_config = configure_zenoh(
            server_zid,
            "tcp/127.0.0.1:9002".to_string(),
            "tcp/127.0.0.1:9003".to_string(),
        );

        let client_config = configure_zenoh(
            client_zid,
            "tcp/127.0.0.1:9003".to_string(),
            "tcp/127.0.0.1:9002".to_string(),
        );

        let server_session = Arc::new(zenoh::open(server_config).res().await.unwrap());
        let client_session = Arc::new(zenoh::open(client_config).res().await.unwrap());

        // Check zenoh sessions are connected
        wait_for_peer(&server_session, client_zid).await;
        wait_for_peer(&client_session, server_zid).await;

        let service = HelloZService {
            ser_name: "test service".to_string(),
            counter: Arc::new(Mutex::new(0u64)),
        };

        let server = service.get_hello_server(server_session, None);
        let ser_uuid = server.instance_uuid();
        let (stopper, _h) = server.connect().await.unwrap();
        server.initialize().await.unwrap();
        server.register().await.unwrap();
        let (s, handle) = server.start().await.unwrap();

        //sleep 1s for KE propagation
        async_std::task::sleep(std::time::Duration::from_secs(1)).await;

        let client = HelloClient::new(client_session, ser_uuid);

        let hello = client.hello("client".to_string()).await.unwrap();

        assert_eq!(
            String::from("Hello client!, you are connected to test service"),
            hello
        );

        let res = client.add().await.unwrap();

        assert_eq!(1, res);

        client.add().await.unwrap();
        let res = client.add().await.unwrap();

        assert_eq!(3, res);

        server.stop(s).await.unwrap();
        server.unregister().await.unwrap();
        server.disconnect(stopper).await.unwrap();

        let _ = handle.await;
    });
}

#[test]
fn service_unavailable() {
    async_std::task::block_on(async {
        let server_zid = ZenohId::rand();
        let client_zid = ZenohId::rand();

        let server_config = configure_zenoh(
            server_zid,
            "tcp/127.0.0.1:9004".to_string(),
            "tcp/127.0.0.1:9005".to_string(),
        );

        let client_config = configure_zenoh(
            client_zid,
            "tcp/127.0.0.1:9005".to_string(),
            "tcp/127.0.0.1:9004".to_string(),
        );

        let server_session = Arc::new(zenoh::open(server_config).res().await.unwrap());
        let client_session = Arc::new(zenoh::open(client_config).res().await.unwrap());

        // Check zenoh sessions are connected
        wait_for_peer(&server_session, client_zid).await;
        wait_for_peer(&client_session, server_zid).await;

        //sleep 1s for KE propagation
        async_std::task::sleep(std::time::Duration::from_secs(1)).await;

        let servers = HelloClient::find_servers(client_session).await.unwrap();
        let empty: Vec<ZenohId> = vec![];
        assert_eq!(empty, servers);
    });
}