// Copyright 2019-2021 Parity Technologies (UK) Ltd.
//
// Permission is hereby granted, free of charge, to any
// person obtaining a copy of this software and associated
// documentation files (the "Software"), to deal in the
// Software without restriction, including without
// limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software
// is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice
// shall be included in all copies or substantial portions
// of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
// IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

use std::net::SocketAddr;

use jsonrpsee::core::client::ClientT;
use jsonrpsee::core::middleware::RpcServiceBuilder;
use jsonrpsee::server::Server;
use jsonrpsee::ws_client::{WsClient, WsClientBuilder};
use jsonrpsee::{RpcModule, rpc_params};
use tracing_subscriber::util::SubscriberInitExt;

#[tokio::main]
async fn main() -> anyhow::Result<()> {
	let filter = tracing_subscriber::EnvFilter::try_from_default_env()?
		.add_directive("jsonrpsee[method_call{name = \"say_hello\"}]=trace".parse()?);

	tracing_subscriber::FmtSubscriber::builder().with_env_filter(filter).finish().try_init()?;

	let addr = run_server().await?;
	let url = format!("ws://{}", addr);

	let client: WsClient = WsClientBuilder::new().build(&url).await?;
	let response: String = client.request("say_hello", rpc_params![]).await?;
	tracing::info!("response: {:?}", response);

	Ok(())
}

async fn run_server() -> anyhow::Result<SocketAddr> {
	let rpc_middleware = RpcServiceBuilder::new().rpc_logger(1024);
	let server = Server::builder().set_rpc_middleware(rpc_middleware).build("127.0.0.1:0").await?;
	let mut module = RpcModule::new(());
	module.register_method("say_hello", |_, _, _| "lo")?;
	let addr = server.local_addr()?;

	let handle = server.start(module);

	// In this example we don't care about doing shutdown so let's it run forever.
	// You may use the `ServerHandle` to shut it down or manage it yourself.
	tokio::spawn(handle.stopped());

	Ok(addr)
}