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// This file is part of Substrate.

// Copyright (C) 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/>.

use super::config::Config;
use mixnet::core::PACKET_SIZE;
use sc_network::{
	config::{NonReservedPeerMode, SetConfig},
	peer_store::PeerStoreProvider,
	service::NotificationMetrics,
	NetworkBackend, NotificationService, ProtocolName,
};
use sp_runtime::traits::Block as BlockT;

/// Returns the protocol name to use for the mixnet controlled by the given chain.
pub fn protocol_name(genesis_hash: &[u8], fork_id: Option<&str>) -> ProtocolName {
	let name = if let Some(fork_id) = fork_id {
		format!("/{}/{}/mixnet/1", array_bytes::bytes2hex("", genesis_hash), fork_id)
	} else {
		format!("/{}/mixnet/1", array_bytes::bytes2hex("", genesis_hash))
	};
	name.into()
}

/// Returns the peers set configuration for the mixnet protocol.
pub fn peers_set_config<Block: BlockT, Network: NetworkBackend<Block, <Block as BlockT>::Hash>>(
	name: ProtocolName,
	config: &Config,
	metrics: NotificationMetrics,
	peerstore_handle: std::sync::Arc<dyn PeerStoreProvider>,
) -> (Network::NotificationProtocolConfig, Box<dyn NotificationService>) {
	let set_config = if config.substrate.num_gateway_slots != 0 {
		// out_peers is always 0; we are only interested in connecting to mixnodes, which we do by
		// setting them as reserved nodes
		SetConfig {
			in_peers: config.substrate.num_gateway_slots,
			out_peers: 0,
			reserved_nodes: Vec::new(),
			non_reserved_mode: NonReservedPeerMode::Accept,
		}
	} else {
		SetConfig {
			in_peers: 0,
			out_peers: 0,
			reserved_nodes: Vec::new(),
			non_reserved_mode: NonReservedPeerMode::Deny,
		}
	};

	Network::notification_config(
		name,
		Vec::new(),
		PACKET_SIZE as u64,
		None,
		set_config,
		metrics,
		peerstore_handle,
	)
}