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// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
// This file is part of Frontier.
//
// Copyright (c) 2020-2022 Parity Technologies (UK) Ltd.
//
// 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 std::{marker::PhantomData, sync::Arc};

use ethereum_types::H256;
use jsonrpsee::core::RpcResult;
// Substrate
use sp_api::{Core, ProvideRuntimeApi};
use sp_blockchain::HeaderBackend;
use sp_core::keccak_256;
use sp_runtime::traits::Block as BlockT;
// Frontier
use fc_rpc_core::{types::Bytes, Web3ApiServer};
use fp_rpc::EthereumRuntimeRPCApi;

use crate::internal_err;

/// Web3 API implementation.
pub struct Web3<B, C> {
    client: Arc<C>,
    _marker: PhantomData<B>,
}

impl<B, C> Web3<B, C> {
    pub fn new(client: Arc<C>) -> Self {
        Self {
            client,
            _marker: PhantomData,
        }
    }
}

impl<B, C> Web3ApiServer for Web3<B, C>
where
    B: BlockT,
    C: ProvideRuntimeApi<B>,
    C::Api: EthereumRuntimeRPCApi<B>,
    C: HeaderBackend<B> + 'static,
{
    fn client_version(&self) -> RpcResult<String> {
        let hash = self.client.info().best_hash;
        let version = self
            .client
            .runtime_api()
            .version(hash)
            .map_err(|err| internal_err(format!("fetch runtime version failed: {:?}", err)))?;
        Ok(format!(
            "{spec_name}/v{spec_version}.{impl_version}/{pkg_name}-{pkg_version}",
            spec_name = version.spec_name,
            spec_version = version.spec_version,
            impl_version = version.impl_version,
            pkg_name = env!("CARGO_PKG_NAME"),
            pkg_version = env!("CARGO_PKG_VERSION")
        ))
    }

    fn sha3(&self, input: Bytes) -> RpcResult<H256> {
        Ok(H256::from(keccak_256(&input.into_vec())))
    }
}