// Copyright 2019-2020 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.

#![cfg(test)]
#![allow(clippy::blacklisted_name)]

mod helpers;

use helpers::{http_server, websocket_server, websocket_server_with_subscription};
use jsonrpsee::{
	http_client::HttpClientBuilder,
	types::{
		traits::{Client, SubscriptionClient},
		v2::params::JsonRpcParams,
		Error, JsonValue, Subscription,
	},
	ws_client::WsClientBuilder,
};
use std::sync::Arc;
use std::time::Duration;

#[tokio::test]
async fn ws_subscription_works() {
	let (server_addr, _) = websocket_server_with_subscription().await;
	let server_url = format!("ws://{}", server_addr);
	let client = WsClientBuilder::default().build(&server_url).await.unwrap();
	let mut hello_sub: Subscription<String> =
		client.subscribe("subscribe_hello", JsonRpcParams::NoParams, "unsubscribe_hello").await.unwrap();
	let mut foo_sub: Subscription<u64> =
		client.subscribe("subscribe_foo", JsonRpcParams::NoParams, "unsubscribe_foo").await.unwrap();

	for _ in 0..10 {
		let hello = hello_sub.next().await.unwrap();
		let foo = foo_sub.next().await.unwrap();
		assert_eq!(hello, Some("hello from subscription".into()));
		assert_eq!(foo, Some(1337));
	}
}

#[tokio::test]
async fn ws_subscription_with_input_works() {
	let (server_addr, _) = websocket_server_with_subscription().await;
	let server_url = format!("ws://{}", server_addr);
	let client = WsClientBuilder::default().build(&server_url).await.unwrap();
	let mut add_one: Subscription<u64> =
		client.subscribe("subscribe_add_one", vec![1.into()].into(), "unsubscribe_add_one").await.unwrap();

	for i in 2..4 {
		let next = add_one.next().await.unwrap().unwrap();
		assert_eq!(next, i);
	}
}

#[tokio::test]
async fn ws_method_call_works() {
	let server_addr = websocket_server().await;
	let server_url = format!("ws://{}", server_addr);
	let client = WsClientBuilder::default().build(&server_url).await.unwrap();
	let response: String = client.request("say_hello", JsonRpcParams::NoParams).await.unwrap();
	assert_eq!(&response, "hello");
}

#[tokio::test]
async fn http_method_call_works() {
	let server_addr = http_server().await;
	let uri = format!("http://{}", server_addr);
	let client = HttpClientBuilder::default().build(&uri).unwrap();
	let response: String = client.request("say_hello", JsonRpcParams::NoParams).await.unwrap();
	assert_eq!(&response, "hello");
}

#[tokio::test]
async fn ws_subscription_several_clients() {
	let (server_addr, _) = websocket_server_with_subscription().await;
	let server_url = format!("ws://{}", server_addr);

	let mut clients = Vec::with_capacity(10);
	for _ in 0..10 {
		let client = WsClientBuilder::default().build(&server_url).await.unwrap();
		let hello_sub: Subscription<JsonValue> =
			client.subscribe("subscribe_hello", JsonRpcParams::NoParams, "unsubscribe_hello").await.unwrap();
		let foo_sub: Subscription<JsonValue> =
			client.subscribe("subscribe_foo", JsonRpcParams::NoParams, "unsubscribe_foo").await.unwrap();
		clients.push((client, hello_sub, foo_sub))
	}
}

#[tokio::test]
async fn ws_subscription_several_clients_with_drop() {
	let (server_addr, _) = websocket_server_with_subscription().await;
	let server_url = format!("ws://{}", server_addr);

	let mut clients = Vec::with_capacity(10);
	for _ in 0..10 {
		let client =
			WsClientBuilder::default().max_notifs_per_subscription(u32::MAX as usize).build(&server_url).await.unwrap();
		let hello_sub: Subscription<String> =
			client.subscribe("subscribe_hello", JsonRpcParams::NoParams, "unsubscribe_hello").await.unwrap();
		let foo_sub: Subscription<u64> =
			client.subscribe("subscribe_foo", JsonRpcParams::NoParams, "unsubscribe_foo").await.unwrap();
		clients.push((client, hello_sub, foo_sub))
	}

	for _ in 0..10 {
		for (_client, hello_sub, foo_sub) in &mut clients {
			let hello = hello_sub.next().await.unwrap().unwrap();
			let foo = foo_sub.next().await.unwrap().unwrap();
			assert_eq!(&hello, "hello from subscription");
			assert_eq!(foo, 1337);
		}
	}

	for i in 0..5 {
		let (client, hello_sub, foo_sub) = clients.remove(i);
		drop(hello_sub);
		drop(foo_sub);
		// Send this request to make sure that the client's background thread hasn't
		// been canceled.
		assert!(client.is_connected());
		drop(client);
	}

	// make sure nothing weird happened after dropping half the clients (should be `unsubscribed` in the server)
	// would be good to know that subscriptions actually were removed but not possible to verify at
	// this layer.
	for _ in 0..10 {
		for (_client, hello_sub, foo_sub) in &mut clients {
			let hello = hello_sub.next().await.unwrap().unwrap();
			let foo = foo_sub.next().await.unwrap().unwrap();
			assert_eq!(&hello, "hello from subscription");
			assert_eq!(foo, 1337);
		}
	}
}

#[tokio::test]
async fn ws_subscription_without_polling_doesnt_make_client_unuseable() {
	let (server_addr, _) = websocket_server_with_subscription().await;
	let server_url = format!("ws://{}", server_addr);

	let client = WsClientBuilder::default().max_notifs_per_subscription(4).build(&server_url).await.unwrap();
	let mut hello_sub: Subscription<JsonValue> =
		client.subscribe("subscribe_hello", JsonRpcParams::NoParams, "unsubscribe_hello").await.unwrap();

	// don't poll the subscription stream for 2 seconds, should be full now.
	tokio::time::sleep(Duration::from_secs(2)).await;

	// Capacity is `num_sender` + `capacity`
	for _ in 0..5 {
		assert!(hello_sub.next().await.unwrap().is_some());
	}

	// NOTE: this is now unuseable and unregistered.
	assert!(hello_sub.next().await.unwrap().is_none());

	// The client should still be useable => make sure it still works.
	let _hello_req: JsonValue = client.request("say_hello", JsonRpcParams::NoParams).await.unwrap();

	// The same subscription should be possible to register again.
	let mut other_sub: Subscription<JsonValue> =
		client.subscribe("subscribe_hello", JsonRpcParams::NoParams, "unsubscribe_hello").await.unwrap();

	other_sub.next().await.unwrap();
}

#[tokio::test]
async fn ws_more_request_than_buffer_should_not_deadlock() {
	let server_addr = websocket_server().await;
	let server_url = format!("ws://{}", server_addr);
	let client = Arc::new(WsClientBuilder::default().max_concurrent_requests(2).build(&server_url).await.unwrap());

	let mut requests = Vec::new();

	for _ in 0..6 {
		let c = client.clone();
		requests.push(tokio::spawn(async move { c.request::<String>("say_hello", JsonRpcParams::NoParams).await }));
	}

	for req in requests {
		let _ = req.await.unwrap();
	}
}

#[tokio::test]
#[ignore]
async fn https_works() {
	let client = HttpClientBuilder::default().build("https://kusama-rpc.polkadot.io").unwrap();
	let response: String = client.request("system_chain", JsonRpcParams::NoParams).await.unwrap();
	assert_eq!(&response, "Kusama");
}

#[tokio::test]
#[ignore]
async fn wss_works() {
	let client = WsClientBuilder::default().build("wss://kusama-rpc.polkadot.io").await.unwrap();
	let response: String = client.request("system_chain", JsonRpcParams::NoParams).await.unwrap();
	assert_eq!(&response, "Kusama");
}

#[tokio::test]
async fn ws_with_non_ascii_url_doesnt_hang_or_panic() {
	let err = WsClientBuilder::default().build("wss://♥♥♥♥♥♥∀∂").await;
	assert!(matches!(err, Err(Error::Transport(_))));
}

#[tokio::test]
async fn http_with_non_ascii_url_doesnt_hang_or_panic() {
	let client = HttpClientBuilder::default().build("http://♥♥♥♥♥♥∀∂").unwrap();
	let err: Result<(), Error> = client.request("system_chain", JsonRpcParams::NoParams).await;
	assert!(matches!(err, Err(Error::Transport(_))));
}

#[tokio::test]
async fn ws_unsubscribe_releases_request_slots() {
	let (server_addr, _) = websocket_server_with_subscription().await;
	let server_url = format!("ws://{}", server_addr);

	let client = WsClientBuilder::default().max_concurrent_requests(1).build(&server_url).await.unwrap();

	let sub1: Subscription<JsonValue> =
		client.subscribe("subscribe_hello", JsonRpcParams::NoParams, "unsubscribe_hello").await.unwrap();
	drop(sub1);
	let _: Subscription<JsonValue> =
		client.subscribe("subscribe_hello", JsonRpcParams::NoParams, "unsubscribe_hello").await.unwrap();
}

#[tokio::test]
async fn server_should_be_able_to_close_subscriptions() {
	let (server_addr, _) = websocket_server_with_subscription().await;
	let server_url = format!("ws://{}", server_addr);

	let client = WsClientBuilder::default().build(&server_url).await.unwrap();

	let mut sub: Subscription<String> =
		client.subscribe("subscribe_noop", JsonRpcParams::NoParams, "unsubscribe_noop").await.unwrap();

	let res = sub.next().await;

	assert!(matches!(res, Err(Error::SubscriptionClosed(_))));
}

#[tokio::test]
async fn ws_close_pending_subscription_when_server_terminated() {
	let (server_addr, mut handle) = websocket_server_with_subscription().await;
	let server_url = format!("ws://{}", server_addr);

	let c1 = WsClientBuilder::default().build(&server_url).await.unwrap();

	let mut sub: Subscription<String> =
		c1.subscribe("subscribe_hello", JsonRpcParams::NoParams, "unsubscribe_hello").await.unwrap();

	assert!(matches!(sub.next().await, Ok(Some(_))));

	handle.stop().await.unwrap();
	handle.wait_for_stop().await;

	let sub2: Result<Subscription<String>, _> =
		c1.subscribe("subscribe_hello", JsonRpcParams::NoParams, "unsubscribe_hello").await;

	// no new request should be accepted.
	assert!(matches!(sub2, Err(_)));
	// the already established subscription should also be closed.
	assert!(matches!(sub.next().await, Ok(None)));
}