// Copyright 2021 Parity Technologies (UK) Ltd.
// This file is part of Substrate.

// Substrate 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.

// Substrate 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 Substrate.  If not, see <http://www.gnu.org/licenses/>.

use cumulus_primitives_core::ParaId;
use cumulus_test_service::{initial_head_data, run_relay_chain_validator_node, Keyring::*};
use futures::StreamExt;
use sc_client_api::BlockchainEvents;
use sp_runtime::generic::BlockId;

#[substrate_test_utils::test]
#[ignore]
async fn test_runtime_upgrade() {
	let mut builder = sc_cli::LoggerBuilder::new("runtime=debug");
	builder.with_colors(false);
	let _ = builder.init();

	let para_id = ParaId::from(100);
	let tokio_handle = tokio::runtime::Handle::current();

	// start alice
	let alice =
		run_relay_chain_validator_node(tokio_handle.clone(), Alice, || {}, Vec::new(), None);

	// start bob
	let bob = run_relay_chain_validator_node(
		tokio_handle.clone(),
		Bob,
		|| {},
		vec![alice.addr.clone()],
		None,
	);

	// register parachain
	alice
		.register_parachain(
			para_id,
			cumulus_test_runtime::WASM_BINARY
				.expect("You need to build the WASM binary to run this test!")
				.to_vec(),
			initial_head_data(para_id),
		)
		.await
		.unwrap();

	// run cumulus charlie (a parachain collator)
	let charlie =
		cumulus_test_service::TestNodeBuilder::new(para_id, tokio_handle.clone(), Charlie)
			.enable_collator()
			.connect_to_relay_chain_nodes(vec![&alice, &bob])
			.build()
			.await;

	// run cumulus dave (a parachain full node)
	let dave = cumulus_test_service::TestNodeBuilder::new(para_id, tokio_handle, Dave)
		.connect_to_parachain_node(&charlie)
		.connect_to_relay_chain_nodes(vec![&alice, &bob])
		.build()
		.await;

	// Wait for 2 blocks to be produced
	charlie.wait_for_blocks(2).await;

	let mut expected_runtime_version = charlie
		.client
		.runtime_version_at(&BlockId::number(0))
		.expect("Runtime version exists");
	expected_runtime_version.spec_version += 1;

	let wasm = cumulus_test_runtime::wasm_spec_version_incremented::WASM_BINARY
		.expect("Wasm binary with incremented spec version should have been built");

	// schedule runtime upgrade
	charlie.schedule_upgrade(wasm.into()).await.unwrap();

	let mut import_stream = dave.client.import_notification_stream();

	while let Some(notification) = import_stream.next().await {
		if notification.is_new_best {
			let runtime_version = dave
				.client
				.runtime_version_at(&BlockId::Hash(notification.hash))
				.expect("Runtime version exists");

			if expected_runtime_version == runtime_version {
				break
			}
		}
	}
}