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use std::{future, sync::Arc, time::Duration};
use futures::StreamExt;

// #[derive(Clone)]
// pub struct RpcRequesters {
//     pub debub: Option<moonbeam_rpc_debug::DebugRequester>,
//     pub trace: Option<moonbeam_rpc_trace::CacheRequester>,
// }

pub struct SpawnTaskParams<'a, B: sp_api::BlockT, C, BE> {
    pub task_manager: &'a sc_service::TaskManager,
    pub client: Arc<C>,
    pub substrate_backend: Arc<BE>,
    pub frontier_backend: fc_db::Backend<B>,
    pub filter_pool: Option<fc_rpc_core::types::FilterPool>,
    pub overrides: Arc<fc_rpc::OverrideHandle<B>>,
    pub fee_history_cache: fc_rpc_core::types::FeeHistoryCache,
    pub fee_history_limit: fc_rpc_core::types::FeeHistoryCacheLimit,
    pub sync: Arc<sc_network_sync::SyncingService<B>>,
    pub pubsub_notification_sinks: Arc<fc_mapping_sync::EthereumBlockNotificationSinks<
        fc_mapping_sync::EthereumBlockNotification<B>>>,
    pub prometheus_registry: Option<substrate_prometheus_endpoint::Registry>,
}

pub fn spawn_evm_tracing<B, C, BE>(
    spawn_task_params: SpawnTaskParams<B, C, BE>,
)
    where
        B: sp_runtime::traits::Block<Hash=sp_core::H256> + Send + Sync + 'static,
        B::Header: sp_api::HeaderT<Number=u32>,
        C: sc_client_api::StorageProvider<B, BE> + Sync + Send + 'static
            + sc_client_api::BlockOf
            + sp_api::ProvideRuntimeApi<B>
            + sc_client_api::HeaderBackend<B>
            + sc_client_api::BlockchainEvents<B>
            + sp_blockchain::HeaderMetadata<B, Error=sp_blockchain::Error>,
        C::Api: fp_rpc::EthereumRuntimeRPCApi<B>
            // + moonbeam_rpc_primitives_debug::DebugRuntimeApi<B>
            + sp_block_builder::BlockBuilder<B>,
        BE: sc_client_api::Backend<B> + 'static,
        BE::State: sc_client_api::StateBackend<sp_runtime::traits::BlakeTwo256>,
{
    let SpawnTaskParams {
        task_manager,
        client,
        substrate_backend,
        frontier_backend,
        filter_pool,
        overrides,
        fee_history_cache,
        fee_history_limit,
        sync,
        pubsub_notification_sinks,
        prometheus_registry: _,
    } = spawn_task_params;

    match frontier_backend {
        fc_db::Backend::KeyValue(db) => {
            task_manager.spawn_essential_handle().spawn(
                "frontier-mapping-sync",
                Some("frontier"),
                fc_mapping_sync::kv::MappingSyncWorker::new(
                    client.import_notification_stream(),
                    Duration::new(1, 0),
                    client.clone(),
                    substrate_backend,
                    overrides.clone(),
                    Arc::new(db),
                    3,
                    0,
                    fc_mapping_sync::SyncStrategy::Normal,
                    sync,
                    pubsub_notification_sinks,
                ).for_each(|()| future::ready(())),
            );
        }
        fc_db::Backend::Sql(db) => {
            task_manager.spawn_essential_handle().spawn(
                "frontier-mapping-sync",
                Some("frontier"),
                fc_mapping_sync::sql::SyncWorker::run(
                    client.clone(),
                    substrate_backend,
                    Arc::new(db),
                    client.import_notification_stream(),
                    fc_mapping_sync::sql::SyncWorkerConfig {
                        check_indexed_blocks_interval: Duration::from_secs(60),
                        read_notification_timeout: Duration::from_secs(10),
                    },
                    fc_mapping_sync::SyncStrategy::Normal,
                    sync,
                    pubsub_notification_sinks,
                ),
            );
        }
    }

    if let Some(filter_pool) = filter_pool {
        const FILTER_RETAIN_THRESHOLD: u64 = 100;
        task_manager.spawn_essential_handle().spawn(
            "frontier-filter-pool",
            Some("frontier"),
            fc_rpc::EthTask::filter_pool_task(client.clone(), filter_pool, FILTER_RETAIN_THRESHOLD),
        )
    }

    task_manager.spawn_essential_handle().spawn(
        "frontier-fee-history",
        Some("frontier"),
        fc_rpc::EthTask::fee_history_task(
            client,
            overrides,
            fee_history_cache,
            fee_history_limit,
        ),
    );

    // if evm_tracing_config.ethapi.contains(&EthApi::Debug)
    //     || evm_tracing_config.ethapi.contains(&EthApi::Trace) {
    //     let permit_pool = Arc::new(tokio::sync::Semaphore::new(evm_tracing_config.ethapi_max_permits as usize));
    //
    //     let (trace_filter_task, trace_filter_requester) =
    //         if evm_tracing_config.ethapi.contains(&EthApi::Trace) {
    //             let (trace_filter_task, trace_filter_requester) = moonbeam_rpc_trace::CacheTask::create(
    //                 client.clone(),
    //                 substrate_backend.clone(),
    //                 Duration::from_secs(evm_tracing_config.ethapi_trace_cache_duration),
    //                 Arc::clone(&permit_pool),
    //                 overrides.clone(),
    //                 prometheus_registry
    //             );
    //             (Some(trace_filter_task), Some(trace_filter_requester))
    //         } else {
    //             (None, None)
    //         };
    //
    //     let (debug_task, debug_requester) =
    //         if evm_tracing_config.ethapi.contains(&EthApi::Debug) {
    //             let (debug_task, debug_requester) = moonbeam_rpc_debug::DebugHandler::task(
    //                 client,
    //                 substrate_backend,
    //                 match frontier_backend {
    //                     fc_db::Backend::KeyValue(db) => Arc::new(db),
    //                     fc_db::Backend::Sql(db) => Arc::new(db),
    //                 },
    //                 Arc::clone(&permit_pool),
    //                 overrides,
    //                 evm_tracing_config.tracing_raw_max_memory_usage,
    //             );
    //             (Some(debug_task), Some(debug_requester))
    //         } else {
    //             (None, None)
    //         };
    //
    //     if let Some(trace_filter_task) = trace_filter_task {
    //         task_manager.spawn_essential_handle().spawn(
    //             "frontier-trace-filter",
    //             Some("eth-tracing"),
    //             trace_filter_task,
    //         );
    //     }
    //
    //     if let Some(debug_task) = debug_task {
    //         task_manager.spawn_essential_handle().spawn(
    //             "frontier-debug",
    //             Some("eth-tracing"),
    //             debug_task,
    //         );
    //     }
    //
    //     RpcRequesters {
    //         debub: debug_requester,
    //         trace: trace_filter_requester,
    //     }
    // } else {
    //     RpcRequesters {
    //         debub: None,
    //         trace: None,
    //     }
    // }
}