package cc.mrbird.febs.mall.chain.ercCoin;

import cc.mrbird.febs.common.exception.FebsException;
import io.reactivex.Flowable;
import io.reactivex.schedulers.Schedulers;
import lombok.extern.slf4j.Slf4j;
import org.web3j.crypto.Credentials;
import org.web3j.protocol.Web3j;
import org.web3j.protocol.core.DefaultBlockParameter;
import org.web3j.protocol.core.DefaultBlockParameterName;
import org.web3j.protocol.core.DefaultBlockParameterNumber;
import org.web3j.protocol.core.methods.request.EthFilter;
import org.web3j.protocol.http.HttpService;
import org.web3j.tx.gas.StaticGasProvider;

import java.math.BigInteger;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

@Slf4j
public class ChainService {
    private final static Map<String, ContractChainService> contractMap = new HashMap<>();

    static {
        for (ChainEnum chain : ChainEnum.values()) {
            contractMap.put(chain.name(), new EthService(chain.getUrl(), chain.getAddress(), chain.getPrivateKey(), chain.getContractAddress()));
        }
    }

    private ChainService() {
    }

    public final static ChainService INSTANCE = new ChainService();

    public static ContractChainService getInstance(String chainType) {
        ContractChainService contract = contractMap.get(chainType);
        if (contract == null) {
            throw new FebsException("参数错误");
        }

        return contract;
    }

    public static void sdmUSDTEventListener(BigInteger startBlock, BigInteger endBlock, ContractEventService event, String type) {
        ChainEnum chain = ChainEnum.getValueByName(type);
        assert chain != null;

        EthUsdtContract contract = contract(chain.getPrivateKey(), chain.getContractAddress(), chain.getUrl());
        EthFilter filter = getFilter(startBlock, endBlock, chain.getContractAddress());

        Flowable<EthUsdtContract.TransferEventResponse> eventFlowable = contract.transferEventFlowable(filter)
                .doOnError(throwable ->
                        log.error("合约事件监听发生错误: " + throwable.getMessage(), throwable)) // 更具体的错误日志记录
                .retryWhen(errors -> {
                    AtomicInteger counter = new AtomicInteger();
                    return errors.takeWhile(e -> counter.getAndIncrement() != 3)
                            .flatMap(e -> {
                                System.out.println("delay retry by " + counter.get() + " second(s)");
                                return Flowable.timer(counter.get(), TimeUnit.SECONDS);
                            });
                })
                .subscribeOn(Schedulers.io()); // 指定subscribe操作在IO线程中执行，避免阻塞主线程

        eventFlowable.subscribe(
                e -> {
                    try {
                        event.sdmUSDT(e); // 处理事件
                    } catch (Exception ex) {
                        // 处理事件时可能出现的异常
                        log.error("处理合约事件时出错", ex);
                    }
                },
                Throwable::printStackTrace, // 打印错误堆栈，或者可以替换为更具体的错误处理逻辑
                () -> log.info("合约事件监听已完成") // 在Flowable完成时执行的逻辑，如记录日志等
        );

    }


    private static EthUsdtContract contract(String privateKey, String contractAddress, String url) {
        Credentials credentials = Credentials.create(privateKey);
        HttpService httpService = new HttpService(url);
        return EthUsdtContract.load(contractAddress,
                Web3j.build(httpService),
                credentials,
                new StaticGasProvider(BigInteger.valueOf(4500000L), BigInteger.valueOf(200000L)));
    }

    private static EthFilter getFilter(BigInteger startBlock, BigInteger endBlock, String contractAddress) {
        DefaultBlockParameter startParameterName = null;
        DefaultBlockParameter endParameterName = null;
        if (startBlock != null) {
            startParameterName = new DefaultBlockParameterNumber(startBlock);
        } else {
            startParameterName = DefaultBlockParameterName.EARLIEST;
        }

        if (endBlock != null) {
            endParameterName = new DefaultBlockParameterNumber(endBlock);
        } else {
            endParameterName = DefaultBlockParameterName.LATEST;
        }

        return new EthFilter(startParameterName, endParameterName, contractAddress);
    }

}