/*
 * 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.plugin.services;

import org.hyperledger.besu.datatypes.Hash;
import org.hyperledger.besu.datatypes.Wei;
import org.hyperledger.besu.plugin.Unstable;
import org.hyperledger.besu.plugin.data.BlockBody;
import org.hyperledger.besu.plugin.data.BlockContext;
import org.hyperledger.besu.plugin.data.BlockHeader;
import org.hyperledger.besu.plugin.data.TransactionReceipt;

import java.math.BigInteger;
import java.util.List;
import java.util.Optional;

/** A service that plugins can use to query blocks by number */
@Unstable
public interface BlockchainService extends BesuService {
  /**
   * Gets block by number
   *
   * @param number the block number
   * @return the BlockContext
   */
  Optional<BlockContext> getBlockByNumber(final long number);

  /**
   * Get the hash of the chain head
   *
   * @return chain head hash
   */
  Hash getChainHeadHash();

  /**
   * Get the receipts for a block by block hash
   *
   * @param blockHash the block hash
   * @return the transaction receipts
   */
  Optional<List<TransactionReceipt>> getReceiptsByBlockHash(Hash blockHash);

  /**
   * Store a block
   *
   * @param blockHeader the block header
   * @param blockBody the block body
   * @param receipts the transaction receipts
   */
  void storeBlock(BlockHeader blockHeader, BlockBody blockBody, List<TransactionReceipt> receipts);

  /**
   * Get the block header of the chain head
   *
   * @return chain head block header
   */
  BlockHeader getChainHeadHeader();

  /**
   * Return the base fee for the next block
   *
   * @return base fee of the next block or empty if the fee market does not support base fee
   */
  Optional<Wei> getNextBlockBaseFee();

  /**
   * Get the block hash of the safe block
   *
   * @return the block hash of the safe block
   */
  Optional<Hash> getSafeBlock();

  /**
   * Get the block hash of the finalized block
   *
   * @return the block hash of the finalized block
   */
  Optional<Hash> getFinalizedBlock();

  /**
   * Set the finalized block for non-PoS networks
   *
   * @param blockHash Hash of the finalized block
   * @throws IllegalArgumentException if the block hash is not on the chain
   * @throws UnsupportedOperationException if the network is a PoS network
   */
  void setFinalizedBlock(Hash blockHash)
      throws IllegalArgumentException, UnsupportedOperationException;

  /**
   * Set the safe block for non-PoS networks
   *
   * @param blockHash Hash of the finalized block
   * @throws IllegalArgumentException if the block hash is not on the chain
   * @throws UnsupportedOperationException if the network is a PoS network
   */
  void setSafeBlock(Hash blockHash) throws IllegalArgumentException, UnsupportedOperationException;

  /**
   * Get the chain id
   *
   * @return the chain id
   */
  Optional<BigInteger> getChainId();
}
