/*
 * Copyright contributors to Hyperledger Besu.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
package org.hyperledger.besu.ethereum.api.jsonrpc.internal.methods;

import static org.hyperledger.besu.ethereum.mainnet.feemarket.ExcessBlobGasCalculator.calculateExcessBlobGasForParent;

import org.hyperledger.besu.datatypes.Wei;
import org.hyperledger.besu.ethereum.api.jsonrpc.RpcMethod;
import org.hyperledger.besu.ethereum.api.jsonrpc.internal.JsonRpcRequestContext;
import org.hyperledger.besu.ethereum.api.jsonrpc.internal.response.JsonRpcResponse;
import org.hyperledger.besu.ethereum.api.jsonrpc.internal.response.JsonRpcSuccessResponse;
import org.hyperledger.besu.ethereum.api.jsonrpc.internal.results.Quantity;
import org.hyperledger.besu.ethereum.chain.Blockchain;
import org.hyperledger.besu.ethereum.core.BlockHeader;
import org.hyperledger.besu.ethereum.mainnet.ProtocolSchedule;
import org.hyperledger.besu.ethereum.mainnet.ProtocolSpec;

public class EthBlobBaseFee implements JsonRpcMethod {

  final Blockchain blockchain;

  private final ProtocolSchedule protocolSchedule;

  public EthBlobBaseFee(final Blockchain blockchain, final ProtocolSchedule protocolSchedule) {
    this.blockchain = blockchain;
    this.protocolSchedule = protocolSchedule;
  }

  @Override
  public String getName() {
    return RpcMethod.ETH_BLOB_BASE_FEE.getMethodName();
  }

  @Override
  public JsonRpcResponse response(final JsonRpcRequestContext requestContext) {
    return new JsonRpcSuccessResponse(
        requestContext.getRequest().getId(), Quantity.create(computeNextBlobBaseFee()));
  }

  private Wei computeNextBlobBaseFee() {
    final BlockHeader header = blockchain.getChainHeadHeader();
    ProtocolSpec spec = protocolSchedule.getForNextBlockHeader(header, header.getTimestamp());
    return spec.getFeeMarket().blobGasPricePerGas(calculateExcessBlobGasForParent(spec, header));
  }
}
