// Copyright 2019-2020 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/>.

//! A collection of node-specific RPC methods.
//!
//! Since `substrate` core functionality makes no assumptions
//! about the modules used inside the runtime, so do
//! RPC methods defined in `sc-rpc` crate.
//! It means that `client/rpc` can't have any methods that
//! need some strong assumptions about the particular runtime.
//!
//! The RPCs available in this crate however can make some assumptions
//! about how the runtime is constructed and what FRAME pallets
//! are part of it. Therefore all node-runtime-specific RPCs can
//! be placed here or imported from corresponding FRAME RPC definitions.

#![warn(missing_docs)]

use std::{sync::Arc, fmt};

use node_primitives::{Block, BlockNumber, AccountId, Index, Balance};
use node_runtime::UncheckedExtrinsic;
use sp_api::ProvideRuntimeApi;
use sp_transaction_pool::TransactionPool;
use sp_blockchain::{Error as BlockChainError, HeaderMetadata, HeaderBackend};
use sp_consensus::SelectChain;
use sc_keystore::KeyStorePtr;
use sp_consensus_babe::BabeApi;
use sc_consensus_epochs::SharedEpochChanges;
use sc_consensus_babe::{Config, Epoch};
use sc_consensus_babe_rpc::BabeRPCHandler;

/// Light client extra dependencies.
pub struct LightDeps<C, F, P> {
	/// The client instance to use.
	pub client: Arc<C>,
	/// Transaction pool instance.
	pub pool: Arc<P>,
	/// Remote access to the blockchain (async).
	pub remote_blockchain: Arc<dyn sc_client::light::blockchain::RemoteBlockchain<Block>>,
	/// Fetcher instance.
	pub fetcher: Arc<F>,
}

/// Extra dependencies for BABE.
pub struct BabeDeps {
	/// BABE protocol config.
	pub babe_config: Config,
	/// BABE pending epoch changes.
	pub shared_epoch_changes: SharedEpochChanges<Block, Epoch>,
	/// The keystore that manages the keys of the node.
	pub keystore: KeyStorePtr,
}

/// Full client dependencies.
pub struct FullDeps<C, P, SC> {
	/// The client instance to use.
	pub client: Arc<C>,
	/// Transaction pool instance.
	pub pool: Arc<P>,
	/// The SelectChain Strategy
	pub select_chain: SC,
	/// BABE specific dependencies.
	pub babe: BabeDeps,
}

/// Instantiate all Full RPC extensions.
pub fn create_full<C, P, M, SC>(
	deps: FullDeps<C, P, SC>,
) -> jsonrpc_core::IoHandler<M> where
	C: ProvideRuntimeApi<Block>,
	C: HeaderBackend<Block> + HeaderMetadata<Block, Error=BlockChainError> + 'static,
	C: Send + Sync + 'static,
	C::Api: substrate_frame_rpc_system::AccountNonceApi<Block, AccountId, Index>,
	C::Api: pallet_contracts_rpc::ContractsRuntimeApi<Block, AccountId, Balance, BlockNumber>,
	C::Api: pallet_transaction_payment_rpc::TransactionPaymentRuntimeApi<Block, Balance, UncheckedExtrinsic>,
	C::Api: BabeApi<Block>,
	<C::Api as sp_api::ApiErrorExt>::Error: fmt::Debug,
	P: TransactionPool + 'static,
	M: jsonrpc_core::Metadata + Default,
	SC: SelectChain<Block> +'static,
{
	use substrate_frame_rpc_system::{FullSystem, SystemApi};
	use pallet_contracts_rpc::{Contracts, ContractsApi};
	use pallet_transaction_payment_rpc::{TransactionPayment, TransactionPaymentApi};

	let mut io = jsonrpc_core::IoHandler::default();
	let FullDeps {
		client,
		pool,
		select_chain,
		babe
	} = deps;
	let BabeDeps {
		keystore,
		babe_config,
		shared_epoch_changes,
	} = babe;

	io.extend_with(
		SystemApi::to_delegate(FullSystem::new(client.clone(), pool))
	);
	// Making synchronous calls in light client freezes the browser currently,
	// more context: https://github.com/paritytech/substrate/pull/3480
	// These RPCs should use an asynchronous caller instead.
	io.extend_with(
		ContractsApi::to_delegate(Contracts::new(client.clone()))
	);
	io.extend_with(
		TransactionPaymentApi::to_delegate(TransactionPayment::new(client.clone()))
	);
	io.extend_with(
		sc_consensus_babe_rpc::BabeApi::to_delegate(
			BabeRPCHandler::new(client, shared_epoch_changes, keystore, babe_config, select_chain)
		)
	);

	io
}

/// Instantiate all Light RPC extensions.
pub fn create_light<C, P, M, F>(
	deps: LightDeps<C, F, P>,
) -> jsonrpc_core::IoHandler<M> where
	C: sc_client::blockchain::HeaderBackend<Block>,
	C: Send + Sync + 'static,
	F: sc_client::light::fetcher::Fetcher<Block> + 'static,
	P: TransactionPool + 'static,
	M: jsonrpc_core::Metadata + Default,
{
	use substrate_frame_rpc_system::{LightSystem, SystemApi};

	let LightDeps {
		client,
		pool,
		remote_blockchain,
		fetcher
	} = deps;
	let mut io = jsonrpc_core::IoHandler::default();
	io.extend_with(
		SystemApi::<AccountId, Index>::to_delegate(LightSystem::new(client, remote_blockchain, fetcher, pool))
	);

	io
}