/**
 * This file is part of the Meeds project (https://meeds.io/).
 *
 * Copyright (C) 2020 - 2024 Meeds Association contact@meeds.io
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
package io.meeds.tenant.hub.service;

import java.io.IOException;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.math.RoundingMode;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.web3j.protocol.Web3j;
import org.web3j.protocol.core.methods.request.Transaction;
import org.web3j.tx.gas.ContractGasProvider;

import io.meeds.wallet.blockchain.service.EthereumClientConnector;

import lombok.SneakyThrows;

@Component
public class PolygonContractGasProvider implements ContractGasProvider {

  private static final Logger     LOG       = LoggerFactory.getLogger(PolygonContractGasProvider.class);

  private static final BigInteger GAS_LIMIT = BigInteger.valueOf(1000000);

  @Autowired(required = false)
  private EthereumClientConnector clientConnector;

  private Web3j                   web3j;

  private long                    chainId;

  @Override
  @SneakyThrows
  public BigInteger getGasPrice() {
    BigInteger gasPrice = getWeb3j().ethGasPrice().send().getGasPrice();
    return new BigDecimal(gasPrice).multiply(BigDecimal.valueOf(1.2))
                                   .setScale(0, RoundingMode.HALF_EVEN)
                                   .toBigInteger();
  }

  public BigInteger getGasPrice(String contractFunc) {
    return getGasPrice();
  }

  public BigInteger getGasLimit(String contractFunc) {
    return getGasLimit();
  }

  @Override
  public BigInteger getGasLimit(Transaction transaction) {
    return getGasLimit();
  }

  @Override
  public BigInteger getGasLimit() {
    return GAS_LIMIT;
  }

  public long getChainId() {
    if (chainId == 0) {
      try {
        chainId = getWeb3j().ethChainId().send().getChainId().longValue();
      } catch (IOException e) {
        LOG.warn("Error retrieving Network Identifier", e);
        return 137l; // Polygon Mainnet in case it fails on production
      }
    }
    return chainId;
  }

  public Web3j getWeb3j() {
    if (web3j == null) {
      web3j = clientConnector.getWeb3j(false);
    }
    return web3j;
  }

}
