// Copyright 2019-2020 Parity Technologies (UK) Ltd.
// This file is part of Polkadot.

// Polkadot is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Polkadot is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.

//! Basic parachain that adds a number as part of its state.

use polkadot_parachain as parachain;
use crate::{adder, DummyExt};
use crate::parachain::{ValidationParams, wasm_executor::EXECUTION_TIMEOUT_SEC};

// Code that exposes `validate_block` and loops infinitely
const INFINITE_LOOP_CODE: &[u8] = halt::WASM_BINARY;

#[test]
fn terminates_on_timeout() {
	let result = parachain::wasm_executor::validate_candidate(
		INFINITE_LOOP_CODE,
		ValidationParams {
			parent_head: Default::default(),
			block_data: Vec::new(),
			ingress: Vec::new(),
		},
		&mut DummyExt,
		parachain::wasm_executor::ExecutionMode::RemoteTest,
	);
	match result {
		Err(parachain::wasm_executor::Error::Timeout) => {},
		r => panic!("{:?}", r),
	}

	// check that another parachain can validate normaly
	adder::execute_good_on_parent();
}

#[test]
fn parallel_execution() {
	let start = std::time::Instant::now();
	let thread = std::thread::spawn(move ||
		parachain::wasm_executor::validate_candidate(
		INFINITE_LOOP_CODE,
		ValidationParams {
			parent_head: Default::default(),
			block_data: Vec::new(),
			ingress: Vec::new(),
		},
		&mut DummyExt,
		parachain::wasm_executor::ExecutionMode::RemoteTest,
	).ok());
	let _ = parachain::wasm_executor::validate_candidate(
		INFINITE_LOOP_CODE,
		ValidationParams {
			parent_head: Default::default(),
			block_data: Vec::new(),
			ingress: Vec::new(),
		},
		&mut DummyExt,
		parachain::wasm_executor::ExecutionMode::RemoteTest,
	);
	thread.join().unwrap();
	// total time should be < 2 x EXECUTION_TIMEOUT_SEC
	assert!(
		std::time::Instant::now().duration_since(start)
		< std::time::Duration::from_secs(EXECUTION_TIMEOUT_SEC * 2)
	);
}