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// This file is part of Substrate.

// Copyright (C) 2017-2021 Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0

// This program 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.

// This program 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 this program. If not, see <https://www.gnu.org/licenses/>.

//! Light client utilities.

use std::sync::Arc;

use prometheus_endpoint::Registry;
use sc_executor::RuntimeVersionOf;
use sc_telemetry::TelemetryHandle;
use sp_blockchain::Result as ClientResult;
use sp_core::traits::{CodeExecutor, SpawnNamed};
use sp_runtime::{
	traits::{Block as BlockT, HashFor},
	BuildStorage,
};

use super::{
	call_executor::LocalCallExecutor,
	client::{Client, ClientConfig},
};
use sc_client_api::light::Storage as BlockchainStorage;
use sc_light::{Backend, GenesisCallExecutor};

/// Create an instance of light client.
pub fn new_light<B, S, RA, E>(
	backend: Arc<Backend<S, HashFor<B>>>,
	genesis_storage: &dyn BuildStorage,
	code_executor: E,
	spawn_handle: Box<dyn SpawnNamed>,
	prometheus_registry: Option<Registry>,
	telemetry: Option<TelemetryHandle>,
) -> ClientResult<
	Client<
		Backend<S, HashFor<B>>,
		GenesisCallExecutor<
			Backend<S, HashFor<B>>,
			LocalCallExecutor<B, Backend<S, HashFor<B>>, E>,
		>,
		B,
		RA,
	>,
>
where
	B: BlockT,
	S: BlockchainStorage<B> + 'static,
	E: CodeExecutor + RuntimeVersionOf + Clone + 'static,
{
	let local_executor = LocalCallExecutor::new(
		backend.clone(),
		code_executor,
		spawn_handle.clone(),
		ClientConfig::default(),
	)?;
	let executor = GenesisCallExecutor::new(backend.clone(), local_executor);
	Client::new(
		backend,
		executor,
		genesis_storage,
		Default::default(),
		Default::default(),
		Default::default(),
		prometheus_registry,
		telemetry,
		ClientConfig::default(),
	)
}