// Copyright 2025 Moonbeam foundation

// This file is part of Moonbeam.

// Moonbeam 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.

// Moonbeam 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 Moonbeam.  If not, see <http://www.gnu.org/licenses/>.

//! Lazy loading implementation for Frontier backend.

//!

//! This module provides a wrapper around the standard Frontier backend that enables

//! lazy loading functionality. It intercepts Ethereum-specific queries and routes them

//! through the RPC client to fetch data on-demand from a remote node.

use fc_api::{LogIndexerBackend, TransactionMetadata};

use serde::de::DeserializeOwned;

use sp_core::H256;

use sp_runtime::traits::{Block as BlockT, Header};

use std::sync::Arc;

/// A wrapper around the Frontier backend that supports lazy loading.

///

/// This backend intercepts Ethereum-specific queries (block hash lookups, transaction metadata)

/// and fetches the data from a remote RPC node when needed, while delegating other operations

/// to the underlying Frontier backend.

#[derive(Clone)]

pub struct LazyLoadingFrontierBackend<Block: BlockT> {

	pub(crate) rpc_client: Arc<super::rpc_client::RPC>,

	pub(crate) frontier_backend: Arc<dyn fc_api::Backend<Block> + Send + Sync>,

}

impl<Block: BlockT + DeserializeOwned> LazyLoadingFrontierBackend<Block>

where

	<Block::Header as Header>::Number: From<u32>,

{

}

#[async_trait::async_trait]

impl<Block: BlockT + DeserializeOwned> fc_api::Backend<Block> for LazyLoadingFrontierBackend<Block>

where

	<Block::Header as Header>::Number: From<u32>,

{

			}

		}

	async fn transaction_metadata(

		&self,

		eth_transaction_hash: &H256,

			}

		}

}