// Copyright 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/>.

//! Polkadot test service only.

#![warn(missing_docs)]

mod chain_spec;

pub use chain_spec::*;
use futures::future::Future;
use polkadot_overseer::OverseerHandler;
use polkadot_primitives::v1::Block;
use polkadot_runtime_common::BlockHashCount;
use polkadot_service::{
	new_full, NewFull, FullClient, AbstractClient, ClientHandle, ExecuteWithClient,
};
use polkadot_test_runtime::{Runtime, SignedExtra, SignedPayload, VERSION};
use sc_chain_spec::ChainSpec;
use sc_client_api::{execution_extensions::ExecutionStrategies, BlockchainEvents};
use sc_executor::native_executor_instance;
use sc_informant::OutputFormat;
use sc_network::{
	config::{NetworkConfiguration, TransportConfig},
	multiaddr,
};
use service::{
	config::{DatabaseConfig, KeystoreConfig, MultiaddrWithPeerId, WasmExecutionMethod},
	error::Error as ServiceError,
	RpcHandlers, TaskExecutor, TaskManager,
};
use service::{BasePath, Configuration, Role, TFullBackend};
use sp_arithmetic::traits::SaturatedConversion;
use sp_blockchain::HeaderBackend;
use sp_keyring::Sr25519Keyring;
use sp_runtime::{codec::Encode, generic};
use sp_state_machine::BasicExternalities;
use std::sync::Arc;
use substrate_test_client::{BlockchainEventsExt, RpcHandlersExt, RpcTransactionOutput, RpcTransactionError};

native_executor_instance!(
	pub PolkadotTestExecutor,
	polkadot_test_runtime::api::dispatch,
	polkadot_test_runtime::native_version,
	frame_benchmarking::benchmarking::HostFunctions,
);

/// Create a new Polkadot test service for a full node.
pub fn polkadot_test_new_full(
	config: Configuration,
	authority_discovery_enabled: bool,
) -> Result<
	NewFull<Arc<FullClient<polkadot_test_runtime::RuntimeApi, PolkadotTestExecutor>>>,
	ServiceError,
> {
	new_full::<polkadot_test_runtime::RuntimeApi, PolkadotTestExecutor>(
		config,
		authority_discovery_enabled,
		None,
	).map_err(Into::into)
}

/// A wrapper for the test client that implements `ClientHandle`.
pub struct TestClient(pub Arc<polkadot_service::FullClient<polkadot_test_runtime::RuntimeApi, PolkadotTestExecutor>>);

impl ClientHandle for TestClient {
	fn execute_with<T: ExecuteWithClient>(&self, t: T) -> T::Output {
		T::execute_with_client::<_, _, polkadot_service::FullBackend>(t, self.0.clone())
	}
}

/// Create a Polkadot `Configuration`. By default an in-memory socket will be used, therefore you need to provide boot
/// nodes if you want the future node to be connected to other nodes. The `storage_update_func` can be used to make
/// adjustements to the runtime before the node starts.
pub fn node_config(
	storage_update_func: impl Fn(),
	task_executor: TaskExecutor,
	key: Sr25519Keyring,
	boot_nodes: Vec<MultiaddrWithPeerId>,
) -> Configuration {
	let base_path = BasePath::new_temp_dir().expect("could not create temporary directory");
	let root = base_path.path();
	let role = Role::Authority {
		sentry_nodes: Vec::new(),
	};
	let key_seed = key.to_seed();
	let mut spec = polkadot_local_testnet_config();
	let mut storage = spec
		.as_storage_builder()
		.build_storage()
		.expect("could not build storage");

	BasicExternalities::execute_with_storage(&mut storage, storage_update_func);
	spec.set_storage(storage);

	let mut network_config = NetworkConfiguration::new(
		format!("Polkadot Test Node for: {}", key_seed),
		"network/test/0.1",
		Default::default(),
		None,
	);
	let informant_output_format = OutputFormat {
		enable_color: false,
		prefix: format!("[{}] ", key_seed),
	};

	network_config.boot_nodes = boot_nodes;

	network_config.allow_non_globals_in_dht = true;

	network_config
		.listen_addresses
		.push(multiaddr::Protocol::Memory(rand::random()).into());

	network_config.transport = TransportConfig::MemoryOnly;

	Configuration {
		impl_name: "polkadot-test-node".to_string(),
		impl_version: "0.1".to_string(),
		role,
		task_executor,
		transaction_pool: Default::default(),
		network: network_config,
		keystore: KeystoreConfig::Path {
			path: root.join("key"),
			password: None,
		},
		database: DatabaseConfig::RocksDb {
			path: root.join("db"),
			cache_size: 128,
		},
		state_cache_size: 16777216,
		state_cache_child_ratio: None,
		pruning: Default::default(),
		chain_spec: Box::new(spec),
		wasm_method: WasmExecutionMethod::Interpreted,
		// NOTE: we enforce the use of the native runtime to make the errors more debuggable
		execution_strategies: ExecutionStrategies {
			syncing: sc_client_api::ExecutionStrategy::NativeWhenPossible,
			importing: sc_client_api::ExecutionStrategy::NativeWhenPossible,
			block_construction: sc_client_api::ExecutionStrategy::NativeWhenPossible,
			offchain_worker: sc_client_api::ExecutionStrategy::NativeWhenPossible,
			other: sc_client_api::ExecutionStrategy::NativeWhenPossible,
		},
		rpc_http: None,
		rpc_ws: None,
		rpc_ipc: None,
		rpc_ws_max_connections: None,
		rpc_cors: None,
		rpc_methods: Default::default(),
		prometheus_config: None,
		telemetry_endpoints: None,
		telemetry_external_transport: None,
		default_heap_pages: None,
		offchain_worker: Default::default(),
		force_authoring: false,
		disable_grandpa: false,
		dev_key_seed: Some(key_seed),
		tracing_targets: None,
		tracing_receiver: Default::default(),
		max_runtime_instances: 8,
		announce_block: true,
		base_path: Some(base_path),
		informant_output_format,
	}
}

/// Run a Polkadot test node using the Polkadot test runtime. The node will be using an in-memory socket, therefore you
/// need to provide boot nodes if you want it to be connected to other nodes. The `storage_update_func` can be used to
/// make adjustements to the runtime before the node starts.
pub fn run_test_node(
	task_executor: TaskExecutor,
	key: Sr25519Keyring,
	storage_update_func: impl Fn(),
	boot_nodes: Vec<MultiaddrWithPeerId>,
) -> PolkadotTestNode<
	TaskManager,
	impl AbstractClient<Block, TFullBackend<Block>>,
> {
	let config = node_config(storage_update_func, task_executor, key, boot_nodes);
	let multiaddr = config.network.listen_addresses[0].clone();
	let authority_discovery_enabled = false;
	let NewFull {task_manager, client, network, rpc_handlers, node_handles, ..} =
		polkadot_test_new_full(config, authority_discovery_enabled)
			.expect("could not create Polkadot test service");

	let peer_id = network.local_peer_id().clone();
	let addr = MultiaddrWithPeerId { multiaddr, peer_id };

	PolkadotTestNode {
		task_manager,
		client,
		handles: node_handles,
		addr,
		rpc_handlers,
	}
}

/// A Polkadot test node instance used for testing.
pub struct PolkadotTestNode<S, C> {
	/// TaskManager's instance.
	pub task_manager: S,
	/// Client's instance.
	pub client: Arc<C>,
	/// Node's handles.
	pub handles: OverseerHandler,
	/// The `MultiaddrWithPeerId` to this node. This is useful if you want to pass it as "boot node" to other nodes.
	pub addr: MultiaddrWithPeerId,
	/// RPCHandlers to make RPC queries.
	pub rpc_handlers: RpcHandlers,
}

impl<S, C> PolkadotTestNode<S, C>
where
	C: HeaderBackend<Block>,
{
	/// Send a transaction through RPCHandlers to call a function.
	pub async fn call_function(
		&self,
		function: polkadot_test_runtime::Call,
		caller: Sr25519Keyring,
	) -> Result<RpcTransactionOutput, RpcTransactionError> {
		let current_block_hash = self.client.info().best_hash;
		let current_block = self.client.info().best_number.saturated_into();
		let genesis_block = self.client.hash(0).unwrap().unwrap();
		let nonce = 0;
		let period = BlockHashCount::get()
			.checked_next_power_of_two()
			.map(|c| c / 2)
			.unwrap_or(2) as u64;
		let tip = 0;
		let extra: SignedExtra = (
			frame_system::CheckSpecVersion::<Runtime>::new(),
			frame_system::CheckTxVersion::<Runtime>::new(),
			frame_system::CheckGenesis::<Runtime>::new(),
			frame_system::CheckEra::<Runtime>::from(generic::Era::mortal(period, current_block)),
			frame_system::CheckNonce::<Runtime>::from(nonce),
			frame_system::CheckWeight::<Runtime>::new(),
			pallet_transaction_payment::ChargeTransactionPayment::<Runtime>::from(tip),
		);
		let raw_payload = SignedPayload::from_raw(
			function.clone(),
			extra.clone(),
			(
				VERSION.spec_version,
				VERSION.transaction_version,
				genesis_block,
				current_block_hash,
				(),
				(),
				(),
			),
		);
		let signature = raw_payload.using_encoded(|e| caller.sign(e));
		let extrinsic = polkadot_test_runtime::UncheckedExtrinsic::new_signed(
			function.clone(),
			polkadot_test_runtime::Address::Id(caller.public().into()),
			polkadot_primitives::v0::Signature::Sr25519(signature.clone()),
			extra.clone(),
		);

		self.rpc_handlers.send_transaction(extrinsic.into()).await
	}
}

impl<S, C> PolkadotTestNode<S, C>
where
	C: BlockchainEvents<Block>,
{
	/// Wait for `count` blocks to be imported in the node and then exit. This function will not return if no blocks
	/// are ever created, thus you should restrict the maximum amount of time of the test execution.
	pub fn wait_for_blocks(&self, count: usize) -> impl Future<Output = ()> {
		self.client.wait_for_blocks(count)
	}
}