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//! Example showing how to add multiple middlewares to the same server.

use jsonrpsee::{
	rpc_params,
	types::{middleware, traits::Client},
	ws_client::WsClientBuilder,
	ws_server::{RpcModule, WsServerBuilder},
};
use std::net::SocketAddr;
use std::time::Instant;

/// Example middleware to measure call execution time.
#[derive(Clone)]
struct Timings;

impl middleware::Middleware for Timings {
	type Instant = Instant;

	fn on_request(&self) -> Self::Instant {
		Instant::now()
	}

	fn on_call(&self, name: &str) {
		println!("[Timings] They called '{}'", name);
	}

	fn on_result(&self, name: &str, succeess: bool, started_at: Self::Instant) {
		println!("[Timings] call={}, worked? {}, duration {:?}", name, succeess, started_at.elapsed());
	}

	fn on_response(&self, started_at: Self::Instant) {
		println!("[Timings] Response duration {:?}", started_at.elapsed());
	}
}

/// Example middleware to keep a watch on the number of total threads started in the system.
#[derive(Clone)]
struct ThreadWatcher;

impl middleware::Middleware for ThreadWatcher {
	type Instant = isize;

	fn on_request(&self) -> Self::Instant {
		let threads = palaver::process::count_threads();
		println!("[ThreadWatcher] Threads running on the machine at the start of a call: {}", threads);
		threads as isize
	}

	fn on_response(&self, started_at: Self::Instant) {
		let current_nr_threads = palaver::process::count_threads() as isize;
		println!("[ThreadWatcher] Request started {} threads", current_nr_threads - started_at);
	}
}

#[tokio::main]
async fn main() -> anyhow::Result<()> {
	tracing_subscriber::FmtSubscriber::builder()
		.with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
		.try_init()
		.expect("setting default subscriber failed");

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

	let client = WsClientBuilder::default().build(&url).await?;
	let response: String = client.request("say_hello", None).await?;
	println!("response: {:?}", response);
	let _response: Result<String, _> = client.request("unknown_method", None).await;
	let _ = client.request::<String>("say_hello", None).await?;
	let _ = client.request::<()>("thready", rpc_params![4]).await?;

	Ok(())
}

async fn run_server() -> anyhow::Result<SocketAddr> {
	let server = WsServerBuilder::new().set_middleware((Timings, ThreadWatcher)).build("127.0.0.1:0").await?;
	let mut module = RpcModule::new(());
	module.register_method("say_hello", |_, _| Ok("lo"))?;
	module.register_method("thready", |params, _| {
		let thread_count: usize = params.one().unwrap();
		for _ in 0..thread_count {
			std::thread::spawn(|| std::thread::sleep(std::time::Duration::from_secs(1)));
		}
		Ok(())
	})?;
	let addr = server.local_addr()?;
	server.start(module)?;
	Ok(addr)
}