// Copyright 2019-2020 Parity Technologies (UK) Ltd.
// This file is part of substrate-subxt.
//
// subxt 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.
//
// subxt 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-subxt.  If not, see <http://www.gnu.org/licenses/>.

//! Service and ServiceFactory implementation. Specialized wrapper over substrate service.

use sc_client_api::{
    ExecutorProvider,
    RemoteBackend,
};
use sc_executor::native_executor_instance;
pub use sc_executor::NativeExecutor;
use sc_finality_grandpa::{
    FinalityProofProvider as GrandpaFinalityProofProvider,
    SharedVoterState,
    StorageAndProofProvider,
};
use sc_service::{
    error::Error as ServiceError, Configuration, RpcHandlers,
    TaskManager, SpawnTasksParams, BuildNetworkParams, build_network,
};
use sp_consensus_aura::sr25519::AuthorityPair as AuraPair;
use sp_inherents::InherentDataProviders;
use std::{
    sync::Arc,
    time::Duration,
};
use test_node_runtime::{
    self,
    opaque::Block,
    RuntimeApi,
};

// Our native executor instance.
native_executor_instance!(
    pub Executor,
    test_node_runtime::api::dispatch,
    test_node_runtime::native_version,
);


/// Builds a new service for a full client.
pub fn new_full(config: Configuration) -> Result<(TaskManager, RpcHandlers), ServiceError> {
     let inherent_data_providers = sp_inherents::InherentDataProviders::new();

    let (client, backend, keystore, mut task_manager) =
        sc_service::new_full_parts::<Block, RuntimeApi, Executor>(&config)?;
    let client = Arc::new(client);

    let select_chain = sc_consensus::LongestChain::new(backend.clone());

    let transaction_pool = sc_transaction_pool::BasicPool::new_full(
        config.transaction_pool.clone(),
        config.prometheus_registry(),
        task_manager.spawn_handle(),
        client.clone(),
    );

    let (grandpa_block_import, grandpa_link) = sc_finality_grandpa::block_import(
        client.clone(),
        &(client.clone() as Arc<_>),
        select_chain.clone(),
    )?;

    let aura_block_import = sc_consensus_aura::AuraBlockImport::<_, _, _, AuraPair>::new(
        grandpa_block_import.clone(),
        client.clone(),
    );

    let import_queue = sc_consensus_aura::import_queue::<_, _, _, AuraPair, _>(
        sc_consensus_aura::slot_duration(&*client)?,
        aura_block_import,
        Some(Box::new(grandpa_block_import.clone())),
        None,
        client.clone(),
        inherent_data_providers.clone(),
        &task_manager.spawn_handle(),
        config.prometheus_registry(),
	)?;
    let (
        role,
        force_authoring,
        name,
        enable_grandpa,
        prometheus_registry,
    ) = (
        config.role.clone(),
        config.force_authoring,
        config.network.node_name.clone(),
        !config.disable_grandpa,
        config.prometheus_registry().cloned(),
    );

    let provider = client.clone() as Arc<dyn StorageAndProofProvider<_, _>>;
    let finality_proof_provider =
        Arc::new(GrandpaFinalityProofProvider::new(backend.clone(), provider));
	let (network, network_status_sinks, system_rpc_tx) = build_network(BuildNetworkParams {
        config: &config,
        client: client.clone(),
        transaction_pool: transaction_pool.clone(),
        spawn_handle: task_manager.spawn_handle(),
        import_queue,
        on_demand: None,
        block_announce_validator_builder: None,
        finality_proof_request_builder: None,
        finality_proof_provider: Some(finality_proof_provider),
    })?;
	let params = SpawnTasksParams {
		config,
        client: client.clone(),
        backend: backend.clone(),
        task_manager: &mut task_manager,
        keystore: keystore.clone(),
        on_demand: None,
        transaction_pool: transaction_pool.clone(),
        rpc_extensions_builder: Box::new(|_| {}),
        remote_blockchain: None,
        network: network.clone(),
        network_status_sinks,
        system_rpc_tx,
        telemetry_connection_sinks: Default::default()
	};

    let rpc_handlers = sc_service::spawn_tasks(params)?;

    if role.is_authority() {
        let proposer = sc_basic_authorship::ProposerFactory::new(
            client.clone(),
            transaction_pool,
            prometheus_registry.as_ref(),
        );

        let can_author_with =
            sp_consensus::CanAuthorWithNativeVersion::new(client.executor().clone());

        let aura = sc_consensus_aura::start_aura::<_, _, _, _, _, AuraPair, _, _, _>(
            sc_consensus_aura::slot_duration(&*client)?,
            client.clone(),
            select_chain,
            grandpa_block_import,
            proposer,
            network.clone(),
            inherent_data_providers.clone(),
            force_authoring,
            keystore.clone(),
            can_author_with,
        )?;

        // the AURA authoring task is considered essential, i.e. if it
        // fails we take down the service with it.
        task_manager
            .spawn_essential_handle()
            .spawn_blocking("aura", aura);
    }

    // if the node isn't actively participating in consensus then it doesn't
    // need a keystore, regardless of which protocol we use below.
    let keystore = if role.is_authority() {
        Some(keystore as sp_core::traits::BareCryptoStorePtr)
    } else {
        None
    };

    let grandpa_config = sc_finality_grandpa::Config {
        gossip_duration: Duration::from_millis(333),
        justification_period: 512,
        name: Some(name),
        observer_enabled: false,
        keystore,
        is_authority: role.is_network_authority(),
    };

    if enable_grandpa {
        // start the full GRANDPA voter
        // NOTE: non-authorities could run the GRANDPA observer protocol, but at
        // this point the full voter should provide better guarantees of block
        // and vote data availability than the observer. The observer has not
        // been tested extensively yet and having most nodes in a network run it
        // could lead to finality stalls.
        let grandpa_config = sc_finality_grandpa::GrandpaParams {
            config: grandpa_config,
            link: grandpa_link,
            network,
            inherent_data_providers,
            telemetry_on_connect: None,
            voting_rule: sc_finality_grandpa::VotingRulesBuilder::default().build(),
            prometheus_registry,
            shared_voter_state: SharedVoterState::empty(),
        };

        // the GRANDPA voter task is considered infallible, i.e.
        // if it fails we take down the service with it.
        task_manager.spawn_essential_handle().spawn_blocking(
            "grandpa-voter",
            sc_finality_grandpa::run_grandpa_voter(grandpa_config)?,
        );
    } else {
        sc_finality_grandpa::setup_disabled_grandpa(
            client,
            &inherent_data_providers,
            network,
        )?;
    }

    Ok((task_manager, rpc_handlers))
}

/// Builds a new service for a light client.
pub fn new_light(
    config: Configuration,
) -> Result<(TaskManager, RpcHandlers), ServiceError> {
    let (client, backend, keystore, mut task_manager, on_demand) =
        sc_service::new_light_parts::<Block, RuntimeApi, Executor>(&config)?;

    let transaction_pool = Arc::new(sc_transaction_pool::BasicPool::new_light(
        config.transaction_pool.clone(),
        config.prometheus_registry(),
		task_manager.spawn_handle(),
		client.clone(),
		on_demand.clone(),
    ));

    let grandpa_block_import = sc_finality_grandpa::light_block_import(
        client.clone(),
        backend.clone(),
        &(client.clone() as Arc<_>),
        Arc::new(on_demand.checker().clone()) as Arc<_>,
    )?;
    let finality_proof_import = grandpa_block_import.clone();
    let finality_proof_request_builder =
        finality_proof_import.create_finality_proof_request_builder();

    let import_queue = sc_consensus_aura::import_queue::<_, _, _, AuraPair, _>(
        sc_consensus_aura::slot_duration(&*client)?,
        grandpa_block_import,
        None,
        Some(Box::new(finality_proof_import)),
        client.clone(),
        InherentDataProviders::new(),
        &task_manager.spawn_handle(),
        config.prometheus_registry(),
    )?;

    let finality_proof_provider = Arc::new(GrandpaFinalityProofProvider::new(
        backend.clone(),
        client.clone() as Arc<_>,
	));
	
	let (network, network_status_sinks, system_rpc_tx) = build_network(BuildNetworkParams {
        config: &config,
        client: client.clone(),
        transaction_pool: transaction_pool.clone(),
        spawn_handle: task_manager.spawn_handle(),
        import_queue,
        on_demand: Some(on_demand.clone()),
        block_announce_validator_builder: None,
        finality_proof_request_builder: Some(finality_proof_request_builder),
        finality_proof_provider: Some(finality_proof_provider),
    })?;

    let params = SpawnTasksParams {
        on_demand: Some(on_demand),
		network,
		client,
		backend: backend.clone(),
        network_status_sinks,
        system_rpc_tx,
        telemetry_connection_sinks: Default::default(),
        remote_blockchain: Some(backend.remote_blockchain()),
        rpc_extensions_builder: Box::new(|_| ()),
        transaction_pool,
        config,
        keystore,
        task_manager: &mut task_manager,
	};

	sc_service::spawn_tasks(params)
	    .map(|rpc_handlers| (task_manager, rpc_handlers))
}