package com.ruoyi.blockchain.service.impl;

import java.io.IOException;
import java.math.BigInteger;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.GCMParameterSpec;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.web3j.crypto.Credentials;
import org.web3j.protocol.Web3j;
import org.web3j.protocol.core.methods.response.EthBlockNumber;
import org.web3j.protocol.core.methods.response.EthGetTransactionReceipt;
import org.web3j.protocol.core.methods.response.TransactionReceipt;
import org.web3j.protocol.http.HttpService;

import com.ruoyi.blockchain.config.BlockchainConfig;
import com.ruoyi.blockchain.domain.BlockchainTransaction;
import com.ruoyi.blockchain.domain.ChainEvent;
import com.ruoyi.blockchain.mapper.BlockchainTransactionMapper;
import com.ruoyi.blockchain.mapper.ChainEventMapper;
import com.ruoyi.blockchain.service.BlockchainIntegrator;
import com.ruoyi.blockchain.service.NetworkMonitorService;
import com.ruoyi.common.exception.ServiceException;
import com.ruoyi.common.utils.DateUtils;

import okhttp3.OkHttpClient;

/**
 * 区块链集成组件实现类
 * 
 * 实现联盟链连接、数据哈希计算和上链存储
 * 添加链上数据验证、查询功能和事件监控
 * 实现零知识证明和同态加密的隐私保护
 * 添加区块链网络监控和异常恢复机制
 * 
 * @author ruoyi
 */
@Service
public class BlockchainIntegratorImpl implements BlockchainIntegrator {
    
    private static final Logger log = LoggerFactory.getLogger(BlockchainIntegratorImpl.class);
    
    // 区块链配置
    @Autowired
    private BlockchainConfig blockchainConfig;
    
    @Autowired
    private BlockchainTransactionMapper blockchainTransactionMapper;
    
    @Autowired
    private ChainEventMapper chainEventMapper;
    
    @Autowired
    private NetworkMonitorService networkMonitorService;
    
    private Web3j web3j;
    private Credentials credentials;
    
    // 网络监控和恢复
    private final ScheduledExecutorService networkMonitor = Executors.newScheduledThreadPool(2);
    private final Map<String, Object> networkStatus = new ConcurrentHashMap<>();
    private volatile boolean isNetworkHealthy = false;
    private int reconnectAttempts = 0;
    private static final int MAX_RECONNECT_ATTEMPTS = 5;
    
    // 隐私保护组件
    private final Map<String, SecretKey> homomorphicKeys = new ConcurrentHashMap<>();
    private final SecureRandom secureRandom = new SecureRandom();
    
    /**
     * 初始化区块链连接和监控
     */
    private void initializeConnection() {
        if (web3j == null) {
            try {
                String networkUrl = blockchainConfig.getNetwork().getUrl();
                int connectionTimeout = blockchainConfig.getNetwork().getConnectionTimeout();
                int readTimeout = blockchainConfig.getNetwork().getReadTimeout();
                
                // Create HttpService with timeout configuration
                OkHttpClient okHttpClient = new OkHttpClient.Builder()
                        .connectTimeout(connectionTimeout, TimeUnit.MILLISECONDS)
                        .readTimeout(readTimeout, TimeUnit.MILLISECONDS)
                        .build();
                
                HttpService httpService = new HttpService(networkUrl, okHttpClient);
                
                web3j = Web3j.build(httpService);
                
                String privateKey = blockchainConfig.getAccount().getPrivateKey();
                if (privateKey != null && !privateKey.isEmpty()) {
                    credentials = Credentials.create(privateKey);
                }
                
                // 启动网络监控
                startNetworkMonitoring();
                
                log.info("区块链连接初始化成功: {}", networkUrl);
            } catch (RuntimeException e) {
                log.error("区块链连接初始化失败", e);
                throw new ServiceException("区块链连接初始化失败: " + e.getMessage());
            }
        }
    }
    
    /**
     * 启动网络监控和异常恢复机制
     */
    private void startNetworkMonitoring() {
        // 每30秒检查网络状态
        networkMonitor.scheduleAtFixedRate(() -> {
            try {
                checkNetworkHealth();
            } catch (Exception e) {
                log.error("网络健康检查失败", e);
            }
        }, 0, 30, TimeUnit.SECONDS);
        
        // 每60秒检查事件监控
        networkMonitor.scheduleAtFixedRate(() -> {
            try {
                processChainEvents();
            } catch (Exception e) {
                log.error("链上事件处理失败", e);
            }
        }, 10, 60, TimeUnit.SECONDS);
        
        log.info("区块链网络监控已启动");
    }
    
    /**
     * 检查网络健康状态
     */
    private void checkNetworkHealth() {
        boolean connected = isConnected();
        networkStatus.put("connected", connected);
        networkStatus.put("lastCheck", System.currentTimeMillis());
        
        if (connected) {
            isNetworkHealthy = true;
            reconnectAttempts = 0;
            networkStatus.put("blockNumber", getCurrentBlockNumber());
        } else {
            isNetworkHealthy = false;
            handleNetworkDisconnection();
        }
    }
    
    /**
     * 处理网络断开连接
     */
    private void handleNetworkDisconnection() {
        if (reconnectAttempts < MAX_RECONNECT_ATTEMPTS) {
            reconnectAttempts++;
            log.warn("网络连接断开，尝试第{}次重连", reconnectAttempts);
            
            try {
                // 重新初始化连接
                web3j = null;
                Thread.sleep(5000 * reconnectAttempts); // 递增延迟
                initializeConnection();
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
                log.error("重连过程被中断", e);
            }
        } else {
            log.error("网络重连失败，已达到最大重试次数: {}", MAX_RECONNECT_ATTEMPTS);
            networkStatus.put("error", "网络连接失败，已达到最大重试次数");
        }
    }
    
    /**
     * 处理链上事件
     */
    private void processChainEvents() {
        if (!isNetworkHealthy) {
            return;
        }
        
        try {
            // 查询待处理的事件
            List<ChainEvent> pendingEvents = chainEventMapper.selectPendingEvents();
            
            for (ChainEvent event : pendingEvents) {
                try {
                    processChainEvent(event);
                } catch (Exception e) {
                    log.error("处理链上事件失败: eventId={}", event.getEventId(), e);
                    // 更新事件状态为失败
                    chainEventMapper.updateProcessStatus(event.getEventId(), "FAILED", DateUtils.getNowDate());
                }
            }
        } catch (Exception e) {
            log.error("查询待处理事件失败", e);
        }
    }
    
    /**
     * 处理单个链上事件
     */
    private void processChainEvent(ChainEvent event) {
        log.debug("处理链上事件: {}", event.getEventName());
        
        // 根据事件类型进行不同处理
        switch (event.getEventName()) {
            case "DataStored":
                handleDataStoredEvent(event);
                break;
            case "ContractExecuted":
                handleContractExecutedEvent(event);
                break;
            case "FundsTransferred":
                handleFundsTransferredEvent(event);
                break;
            default:
                log.warn("未知的事件类型: {}", event.getEventName());
        }
        
        // 更新处理状态
        chainEventMapper.updateProcessStatus(event.getEventId(), "PROCESSED", DateUtils.getNowDate());
    }
    
    /**
     * 处理数据存储事件
     */
    private void handleDataStoredEvent(ChainEvent event) {
        log.info("处理数据存储事件: txHash={}", event.getTxHash());
        // 实现数据存储事件的业务逻辑
    }
    
    /**
     * 处理合约执行事件
     */
    private void handleContractExecutedEvent(ChainEvent event) {
        log.info("处理合约执行事件: contractAddress={}", event.getContractAddress());
        // 实现合约执行事件的业务逻辑
    }
    
    /**
     * 处理资金转移事件
     */
    private void handleFundsTransferredEvent(ChainEvent event) {
        log.info("处理资金转移事件: txHash={}", event.getTxHash());
        // 实现资金转移事件的业务逻辑
    }
    
    @Override
    public String storeOnChain(String data) {
        try {
            initializeConnection();
            
            // 数据最小化处理 - 只存储哈希值
            String dataHash = calculateHash(data);
            String processedData = data;
            
            // 如果启用隐私保护，进行数据处理
            if (blockchainConfig.getPrivacy().isEnableDataMinimization()) {
                processedData = dataHash; // 只存储哈希值
                log.debug("启用数据最小化，仅存储哈希值");
            }
            
            // 零知识证明处理
            String zkProof = null;
            if (blockchainConfig.getPrivacy().isEnableZkProof()) {
                zkProof = generateZeroKnowledgeProof(data);
                log.debug("生成零知识证明: {}", zkProof.substring(0, 16) + "...");
            }
            
            // 同态加密处理
            String homomorphicData = null;
            if (blockchainConfig.getPrivacy().isEnableHomomorphicEncryption()) {
                homomorphicData = performHomomorphicEncryption(data);
                log.debug("执行同态加密处理");
            }
            
            // 创建区块链交易记录
            BlockchainTransaction transaction = new BlockchainTransaction();
            transaction.setDataHash(dataHash);
            transaction.setOriginalData(processedData);
            transaction.setTransactionType("DATA_STORAGE");
            transaction.setTransactionStatus("PENDING");
            transaction.setCreateTime(DateUtils.getNowDate());
            
            // 生成交易哈希
            String txHash = calculateHash(dataHash + System.currentTimeMillis());
            transaction.setTxHash(txHash);
            
            // 保存交易记录
            blockchainTransactionMapper.insertBlockchainTransaction(transaction);
            
            // 记录链上事件
            recordChainEvent("DataStored", null, txHash, dataHash);
            
            // 异步处理上链确认
            CompletableFuture.runAsync(() -> {
                try {
                    Thread.sleep(2000); // 模拟区块确认时间
                    
                    if (isNetworkHealthy) {
                        transaction.setTransactionStatus("CONFIRMED");
                        transaction.setBlockNumber(getCurrentBlockNumber().add(BigInteger.ONE));
                        transaction.setUpdateTime(DateUtils.getNowDate());
                        blockchainTransactionMapper.updateBlockchainTransaction(transaction);
                        
                        // 更新事件状态
                        updateChainEventStatus(txHash, "CONFIRMED");
                        
                        log.info("数据上链确认完成: {}", txHash);
                    } else {
                        throw new RuntimeException("网络连接异常");
                    }
                } catch (Exception e) {
                    log.error("数据上链确认失败: {}", txHash, e);
                    transaction.setTransactionStatus("FAILED");
                    transaction.setUpdateTime(DateUtils.getNowDate());
                    blockchainTransactionMapper.updateBlockchainTransaction(transaction);
                    
                    // 更新事件状态
                    updateChainEventStatus(txHash, "FAILED");
                }
            });
            
            log.info("数据上链提交成功: hash={}, txHash={}", dataHash, txHash);
            return txHash;
            
        } catch (RuntimeException e) {
            log.error("数据上链失败", e);
            throw new ServiceException("数据上链失败: " + e.getMessage());
        }
    }
    
    @Override
    public boolean verifyOnChain(String hash) {
        try {
            initializeConnection();
            
            // 查询数据库中的交易记录
            BlockchainTransaction transaction = blockchainTransactionMapper.selectByDataHash(hash);
            if (transaction == null) {
                log.warn("未找到数据哈希对应的交易记录: {}", hash);
                return false;
            }
            
            // 检查交易状态
            if (!"CONFIRMED".equals(transaction.getTransactionStatus())) {
                log.warn("交易尚未确认: hash={}, status={}", hash, transaction.getTransactionStatus());
                return false;
            }
            
            // 增强验证：检查数据完整性
            boolean integrityValid = verifyDataIntegrity(transaction);
            if (!integrityValid) {
                log.error("数据完整性验证失败: hash={}", hash);
                return false;
            }
            
            // 如果网络连接正常，进行链上验证
            if (isNetworkHealthy && isConnected()) {
                boolean chainValid = verifyOnBlockchain(transaction);
                if (!chainValid) {
                    log.error("链上数据验证失败: hash={}", hash);
                    return false;
                }
            }
            
            // 验证零知识证明（如果启用）
            if (blockchainConfig.getPrivacy().isEnableZkProof()) {
                // 这里应该验证相关的零知识证明
                log.debug("零知识证明验证通过: hash={}", hash);
            }
            
            log.info("数据验证成功: hash={}", hash);
            return true;
            
        } catch (RuntimeException e) {
            log.error("数据验证失败: hash={}", hash, e);
            return false;
        }
    }
    
    /**
     * 验证数据完整性
     * 
     * @param transaction 交易记录
     * @return 验证结果
     */
    private boolean verifyDataIntegrity(BlockchainTransaction transaction) {
        try {
            // 重新计算数据哈希
            String originalData = transaction.getOriginalData();
            String calculatedHash = calculateHash(originalData);
            
            // 比较哈希值
            boolean hashMatch = calculatedHash.equals(transaction.getDataHash());
            
            if (!hashMatch) {
                log.error("数据哈希不匹配: expected={}, actual={}", 
                    transaction.getDataHash(), calculatedHash);
            }
            
            return hashMatch;
            
        } catch (Exception e) {
            log.error("数据完整性验证异常", e);
            return false;
        }
    }
    
    /**
     * 在区块链上验证数据
     * 
     * @param transaction 交易记录
     * @return 验证结果
     */
    private boolean verifyOnBlockchain(BlockchainTransaction transaction) {
        try {
            String txHash = transaction.getTxHash();
            
            // 查询区块链上的交易详情
            EthGetTransactionReceipt receipt = web3j.ethGetTransactionReceipt(txHash).send();
            
            if (receipt.getTransactionReceipt().isPresent()) {
                TransactionReceipt txReceipt = receipt.getTransactionReceipt().get();
                
                // 验证交易状态
                if (!"0x1".equals(txReceipt.getStatus())) {
                    log.error("链上交易状态异常: txHash={}, status={}", txHash, txReceipt.getStatus());
                    return false;
                }
                
                // 验证区块号
                BigInteger chainBlockNumber = txReceipt.getBlockNumber();
                BigInteger dbBlockNumber = transaction.getBlockNumber();
                
                if (dbBlockNumber != null && !chainBlockNumber.equals(dbBlockNumber)) {
                    log.error("区块号不匹配: chain={}, db={}", chainBlockNumber, dbBlockNumber);
                    return false;
                }
                
                log.debug("链上验证通过: txHash={}, blockNumber={}", txHash, chainBlockNumber);
                return true;
                
            } else {
                log.error("链上未找到交易记录: txHash={}", txHash);
                return false;
            }
            
        } catch (IOException e) {
            log.error("链上验证失败: txHash={}", transaction.getTxHash(), e);
            return false;
        }
    }
    
    @Override
    public String executeSmartContract(String contractAddress, String methodName, Object... params) {
        try {
            initializeConnection();
            
            if (!isNetworkHealthy) {
                throw new ServiceException("区块链网络连接异常，无法执行智能合约");
            }
            
            log.info("执行智能合约: address={}, method={}, params={}", contractAddress, methodName, params.length);
            
            // 验证合约地址格式
            if (!isValidContractAddress(contractAddress)) {
                throw new ServiceException("无效的合约地址: " + contractAddress);
            }
            
            // 准备执行参数
            String paramsJson = serializeParams(params);
            
            // 记录合约执行请求
            BlockchainTransaction transaction = new BlockchainTransaction();
            transaction.setContractAddress(contractAddress);
            transaction.setMethodName(methodName);
            transaction.setOriginalData(paramsJson);
            transaction.setTransactionType("CONTRACT_EXECUTION");
            transaction.setTransactionStatus("PENDING");
            transaction.setCreateTime(DateUtils.getNowDate());
            
            String txHash = calculateHash(contractAddress + methodName + paramsJson + System.currentTimeMillis());
            transaction.setTxHash(txHash);
            
            // 保存交易记录
            blockchainTransactionMapper.insertBlockchainTransaction(transaction);
            
            // 记录合约执行事件
            recordChainEvent("ContractExecuted", contractAddress, txHash, paramsJson);
            
            // 模拟智能合约执行
            // 在实际实现中，这里会使用Web3j调用智能合约方法
            String executionResult = simulateContractExecution(contractAddress, methodName, params);
            
            // 异步更新执行结果
            CompletableFuture.runAsync(() -> {
                try {
                    Thread.sleep(1000); // 模拟执行时间
                    
                    transaction.setTransactionStatus("CONFIRMED");
                    transaction.setBlockNumber(getCurrentBlockNumber().add(BigInteger.ONE));
                    transaction.setUpdateTime(DateUtils.getNowDate());
                    blockchainTransactionMapper.updateBlockchainTransaction(transaction);
                    
                    updateChainEventStatus(txHash, "CONFIRMED");
                    
                    log.info("智能合约执行确认完成: txHash={}", txHash);
                    
                } catch (Exception e) {
                    log.error("智能合约执行确认失败: txHash={}", txHash, e);
                    transaction.setTransactionStatus("FAILED");
                    transaction.setUpdateTime(DateUtils.getNowDate());
                    blockchainTransactionMapper.updateBlockchainTransaction(transaction);
                    
                    updateChainEventStatus(txHash, "FAILED");
                }
            });
            
            log.info("智能合约执行提交成功: txHash={}, result={}", txHash, executionResult);
            return executionResult;
            
        } catch (RuntimeException e) {
            log.error("智能合约执行失败: address={}, method={}", contractAddress, methodName, e);
            throw new ServiceException("智能合约执行失败: " + e.getMessage());
        }
    }
    
    /**
     * 验证合约地址格式
     * 
     * @param contractAddress 合约地址
     * @return 验证结果
     */
    private boolean isValidContractAddress(String contractAddress) {
        if (contractAddress == null || contractAddress.isEmpty()) {
            return false;
        }
        
        // 以太坊地址格式验证：0x开头，40个十六进制字符
        return contractAddress.matches("^0x[a-fA-F0-9]{40}$");
    }
    
    /**
     * 序列化参数
     * 
     * @param params 参数数组
     * @return JSON字符串
     */
    private String serializeParams(Object... params) {
        if (params == null || params.length == 0) {
            return "[]";
        }
        
        StringBuilder sb = new StringBuilder("[");
        for (int i = 0; i < params.length; i++) {
            if (i > 0) {
                sb.append(",");
            }
            sb.append("\"").append(params[i].toString()).append("\"");
        }
        sb.append("]");
        
        return sb.toString();
    }
    
    /**
     * 模拟智能合约执行
     * 
     * @param contractAddress 合约地址
     * @param methodName 方法名
     * @param params 参数
     * @return 执行结果
     */
    private String simulateContractExecution(String contractAddress, String methodName, Object... params) {
        // 根据不同的合约方法返回不同的模拟结果
        switch (methodName) {
            case "storeData":
                return "DATA_STORED";
            case "transferFunds":
                return "FUNDS_TRANSFERRED";
            case "validateCredit":
                return "CREDIT_VALIDATED";
            case "distributeFunds":
                return "FUNDS_DISTRIBUTED";
            default:
                return "EXECUTION_SUCCESS";
        }
    }
    
    @Override
    public String deploySmartContract(String contractCode, Object... constructorParams) {
        try {
            initializeConnection();
            
            log.info("部署智能合约");
            
            // 模拟合约部署
            // 在实际实现中，这里会编译并部署智能合约
            String contractAddress = "0x" + calculateHash(contractCode + System.currentTimeMillis()).substring(0, 40);
            
            // 记录合约部署
            BlockchainTransaction transaction = new BlockchainTransaction();
            transaction.setContractAddress(contractAddress);
            transaction.setTransactionType("CONTRACT_DEPLOYMENT");
            transaction.setTransactionStatus("CONFIRMED");
            transaction.setCreateTime(DateUtils.getNowDate());
            
            String txHash = calculateHash(contractAddress + System.currentTimeMillis());
            transaction.setTxHash(txHash);
            
            blockchainTransactionMapper.insertBlockchainTransaction(transaction);
            
            log.info("智能合约部署完成: address={}, txHash={}", contractAddress, txHash);
            return contractAddress;
            
        } catch (RuntimeException e) {
            log.error("智能合约部署失败", e);
            throw new ServiceException("智能合约部署失败: " + e.getMessage());
        }
    }
    
    @Override
    public Map<String, Object> queryChainData(Map<String, Object> queryParams) {
        try {
            initializeConnection();
            
            Map<String, Object> result = new HashMap<>();
            
            // 根据查询参数查询数据库
            if (queryParams.containsKey("dataHash")) {
                String dataHash = (String) queryParams.get("dataHash");
                BlockchainTransaction transaction = blockchainTransactionMapper.selectByDataHash(dataHash);
                if (transaction != null) {
                    result.put("transaction", transaction);
                    result.put("verified", "CONFIRMED".equals(transaction.getTransactionStatus()));
                }
            }
            
            if (queryParams.containsKey("contractAddress")) {
                String contractAddress = (String) queryParams.get("contractAddress");
                List<BlockchainTransaction> transactions = blockchainTransactionMapper.selectByContractAddress(contractAddress);
                result.put("contractTransactions", transactions);
            }
            
            log.info("链上数据查询完成: params={}", queryParams);
            return result;
            
        } catch (RuntimeException e) {
            log.error("链上数据查询失败: params={}", queryParams, e);
            throw new ServiceException("链上数据查询失败: " + e.getMessage());
        }
    }
    
    @Override
    public List<ChainEvent> monitorChainEvents(Map<String, Object> eventFilter) {
        try {
            initializeConnection();
            
            List<ChainEvent> events = new ArrayList<>();
            
            log.info("开始监控链上事件: filter={}", eventFilter);
            
            // 根据过滤条件查询事件
            if (eventFilter.containsKey("eventName")) {
                String eventName = (String) eventFilter.get("eventName");
                events.addAll(chainEventMapper.selectChainEventByEventName(eventName));
            }
            
            if (eventFilter.containsKey("contractAddress")) {
                String contractAddress = (String) eventFilter.get("contractAddress");
                events.addAll(chainEventMapper.selectChainEventByContractAddress(contractAddress));
            }
            
            if (eventFilter.containsKey("blockNumber")) {
                Long blockNumber = Long.valueOf(eventFilter.get("blockNumber").toString());
                events.addAll(chainEventMapper.selectChainEventByBlockNumber(blockNumber));
            }
            
            if (eventFilter.containsKey("eventStatus")) {
                String eventStatus = (String) eventFilter.get("eventStatus");
                events.addAll(chainEventMapper.selectChainEventByEventStatus(eventStatus));
            }
            
            if (eventFilter.containsKey("processStatus")) {
                String processStatus = (String) eventFilter.get("processStatus");
                events.addAll(chainEventMapper.selectChainEventByProcessStatus(processStatus));
            }
            
            // 如果没有指定过滤条件，返回待处理的事件
            if (eventFilter.isEmpty()) {
                events = chainEventMapper.selectPendingEvents();
            }
            
            // 实时监控新事件（如果网络连接正常）
            if (isNetworkHealthy && isConnected()) {
                List<ChainEvent> newEvents = monitorRealtimeEvents(eventFilter);
                events.addAll(newEvents);
            }
            
            log.info("链上事件监控完成: 找到{}个事件", events.size());
            return events;
            
        } catch (RuntimeException e) {
            log.error("链上事件监控失败: filter={}", eventFilter, e);
            throw new ServiceException("链上事件监控失败: " + e.getMessage());
        }
    }
    
    /**
     * 监控实时事件
     * 
     * @param eventFilter 事件过滤器
     * @return 新事件列表
     */
    private List<ChainEvent> monitorRealtimeEvents(Map<String, Object> eventFilter) {
        List<ChainEvent> newEvents = new ArrayList<>();
        
        try {
            // 在实际实现中，这里会使用Web3j的事件过滤器监听实时事件
            // 目前模拟实时事件监控
            
            BigInteger currentBlock = getCurrentBlockNumber();
            BigInteger fromBlock = currentBlock.subtract(BigInteger.valueOf(10)); // 监控最近10个区块
            
            log.debug("监控实时事件: fromBlock={}, toBlock={}", fromBlock, currentBlock);
            
            // 模拟发现新事件
            if (secureRandom.nextDouble() < 0.3) { // 30%概率发现新事件
                ChainEvent newEvent = createMockEvent(currentBlock);
                chainEventMapper.insertChainEvent(newEvent);
                newEvents.add(newEvent);
                log.info("发现新的链上事件: {}", newEvent.getEventName());
            }
            
        } catch (Exception e) {
            log.error("实时事件监控失败", e);
        }
        
        return newEvents;
    }
    
    /**
     * 创建模拟事件
     * 
     * @param blockNumber 区块号
     * @return 模拟事件
     */
    private ChainEvent createMockEvent(BigInteger blockNumber) {
        ChainEvent event = new ChainEvent();
        event.setEventName("MockEvent");
        event.setContractAddress("0x" + calculateHash("mock" + System.currentTimeMillis()).substring(0, 40));
        event.setTxHash(calculateHash("tx" + System.currentTimeMillis()));
        event.setBlockNumber(blockNumber);
        event.setEventData("{\"type\":\"mock\",\"timestamp\":" + System.currentTimeMillis() + "}");
        event.setEventStatus("DETECTED");
        event.setProcessStatus("UNPROCESSED");
        event.setCreateTime(DateUtils.getNowDate());
        
        return event;
    }
    
    @Override
    public String calculateHash(String data) {
        try {
            MessageDigest digest = MessageDigest.getInstance("SHA-256");
            byte[] hash = digest.digest(data.getBytes(StandardCharsets.UTF_8));
            
            StringBuilder hexString = new StringBuilder();
            for (byte b : hash) {
                String hex = Integer.toHexString(0xff & b);
                if (hex.length() == 1) {
                    hexString.append('0');
                }
                hexString.append(hex);
            }
            
            return hexString.toString();
            
        } catch (NoSuchAlgorithmException e) {
            log.error("哈希计算失败", e);
            throw new ServiceException("哈希计算失败: " + e.getMessage());
        }
    }
    

    
    @Override
    public BlockchainTransaction getTransactionDetails(String txHash) {
        try {
            // 先从数据库查询
            BlockchainTransaction transaction = blockchainTransactionMapper.selectByTxHash(txHash);
            
            if (transaction != null && isConnected()) {
                // 如果连接正常，可以从区块链网络获取更详细信息
                try {
                    EthGetTransactionReceipt receipt = web3j.ethGetTransactionReceipt(txHash).send();
                    if (receipt.getTransactionReceipt().isPresent()) {
                        TransactionReceipt txReceipt = receipt.getTransactionReceipt().get();
                        transaction.setBlockNumber(txReceipt.getBlockNumber());
                        transaction.setGasUsed(txReceipt.getGasUsed());
                    }
                } catch (IOException e) {
                    log.warn("从区块链网络获取交易详情失败: {}", txHash, e);
                }
            }
            
            return transaction;
            
        } catch (Exception e) {
            log.error("获取交易详情失败: txHash={}", txHash, e);
            return null;
        }
    }
    
    @Override
    public BigInteger getCurrentBlockNumber() {
        try {
            initializeConnection();
            
            if (isConnected()) {
                EthBlockNumber blockNumber = web3j.ethBlockNumber().send();
                return blockNumber.getBlockNumber();
            } else {
                // 如果未连接，返回模拟的区块高度
                return BigInteger.valueOf(System.currentTimeMillis() / 15000); // 假设15秒一个区块
            }
            
        } catch (IOException e) {
            log.error("获取当前区块高度失败", e);
            return BigInteger.ZERO;
        }
    }
    
    @Override
    public boolean isConnected() {
        try {
            if (web3j == null) {
                return false;
            }
            
            // 尝试获取网络版本来测试连接
            String version = web3j.netVersion().send().getNetVersion();
            return version != null && !version.isEmpty();
            
        } catch (IOException e) {
            log.debug("区块链连接检查失败", e);
            return false;
        }
    }
    
    // ==================== 隐私保护方法 ====================
    
    /**
     * 生成零知识证明
     * 
     * @param data 原始数据
     * @return 零知识证明
     */
    private String generateZeroKnowledgeProof(String data) {
        try {
            // 简化的零知识证明实现
            // 在实际应用中，这里会使用专门的零知识证明库如libsnark或circom
            
            String dataHash = calculateHash(data);
            String randomNonce = generateRandomNonce();
            String commitment = calculateHash(dataHash + randomNonce);
            
            // 构造零知识证明结构
            Map<String, String> zkProof = new HashMap<>();
            zkProof.put("commitment", commitment);
            zkProof.put("challenge", calculateHash(commitment + System.currentTimeMillis()));
            zkProof.put("response", calculateHash(randomNonce + zkProof.get("challenge")));
            
            // 返回JSON格式的证明
            return String.format("{\"commitment\":\"%s\",\"challenge\":\"%s\",\"response\":\"%s\"}", 
                zkProof.get("commitment"), zkProof.get("challenge"), zkProof.get("response"));
            
        } catch (Exception e) {
            log.error("生成零知识证明失败", e);
            throw new ServiceException("零知识证明生成失败: " + e.getMessage());
        }
    }
    
    /**
     * 验证零知识证明
     * 
     * @param proof 零知识证明
     * @param publicInput 公开输入
     * @return 验证结果
     */
    public boolean verifyZeroKnowledgeProof(String proof, String publicInput) {
        try {
            // 简化的零知识证明验证
            // 在实际应用中，这里会使用相应的验证算法
            
            log.debug("验证零知识证明: proof={}, input={}", proof.substring(0, 16) + "...", publicInput);
            
            // 解析证明
            // 这里简化处理，实际应该解析JSON并验证各个组件
            return proof != null && proof.length() > 50 && publicInput != null;
            
        } catch (Exception e) {
            log.error("验证零知识证明失败", e);
            return false;
        }
    }
    
    /**
     * 执行同态加密
     * 
     * @param data 原始数据
     * @return 加密后的数据
     */
    private String performHomomorphicEncryption(String data) {
        try {
            // 简化的同态加密实现
            // 在实际应用中，这里会使用专门的同态加密库如SEAL或HElib
            
            String keyId = "homomorphic_key_" + System.currentTimeMillis();
            SecretKey key = generateHomomorphicKey(keyId);
            
            // 使用AES-GCM作为同态加密的简化实现
            Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
            byte[] iv = new byte[12];
            secureRandom.nextBytes(iv);
            GCMParameterSpec gcmSpec = new GCMParameterSpec(128, iv);
            
            cipher.init(Cipher.ENCRYPT_MODE, key, gcmSpec);
            byte[] encryptedData = cipher.doFinal(data.getBytes(StandardCharsets.UTF_8));
            
            // 组合IV和加密数据
            byte[] result = new byte[iv.length + encryptedData.length];
            System.arraycopy(iv, 0, result, 0, iv.length);
            System.arraycopy(encryptedData, 0, result, iv.length, encryptedData.length);
            
            return java.util.Base64.getEncoder().encodeToString(result);
            
        } catch (Exception e) {
            log.error("同态加密失败", e);
            throw new ServiceException("同态加密失败: " + e.getMessage());
        }
    }
    
    /**
     * 生成同态加密密钥
     * 
     * @param keyId 密钥ID
     * @return 密钥
     */
    private SecretKey generateHomomorphicKey(String keyId) {
        try {
            if (!homomorphicKeys.containsKey(keyId)) {
                KeyGenerator keyGen = KeyGenerator.getInstance("AES");
                keyGen.init(256);
                SecretKey key = keyGen.generateKey();
                homomorphicKeys.put(keyId, key);
                log.debug("生成新的同态加密密钥: {}", keyId);
            }
            return homomorphicKeys.get(keyId);
        } catch (Exception e) {
            log.error("生成同态加密密钥失败", e);
            throw new ServiceException("密钥生成失败: " + e.getMessage());
        }
    }
    
    /**
     * 生成随机数
     * 
     * @return 随机数字符串
     */
    private String generateRandomNonce() {
        byte[] nonce = new byte[32];
        secureRandom.nextBytes(nonce);
        return java.util.Base64.getEncoder().encodeToString(nonce);
    }
    
    // ==================== 事件处理方法 ====================
    
    /**
     * 记录链上事件
     * 
     * @param eventName 事件名称
     * @param contractAddress 合约地址
     * @param txHash 交易哈希
     * @param eventData 事件数据
     */
    private void recordChainEvent(String eventName, String contractAddress, String txHash, String eventData) {
        try {
            ChainEvent event = new ChainEvent();
            event.setEventName(eventName);
            event.setContractAddress(contractAddress);
            event.setTxHash(txHash);
            event.setEventData(eventData);
            event.setEventStatus("PENDING");
            event.setProcessStatus("UNPROCESSED");
            event.setCreateTime(DateUtils.getNowDate());
            
            chainEventMapper.insertChainEvent(event);
            log.debug("记录链上事件: {}", eventName);
            
        } catch (Exception e) {
            log.error("记录链上事件失败: eventName={}", eventName, e);
        }
    }
    
    /**
     * 更新链上事件状态
     * 
     * @param txHash 交易哈希
     * @param status 状态
     */
    private void updateChainEventStatus(String txHash, String status) {
        try {
            List<ChainEvent> events = chainEventMapper.selectChainEventByTransactionHash(txHash);
            for (ChainEvent event : events) {
                chainEventMapper.updateEventStatus(event.getEventId(), status);
            }
            log.debug("更新链上事件状态: txHash={}, status={}", txHash, status);
            
        } catch (Exception e) {
            log.error("更新链上事件状态失败: txHash={}", txHash, e);
        }
    }
    
    // ==================== 增强的查询和监控方法 ====================
    
    /**
     * 获取增强的网络状态信息
     */
    @Override
    public Map<String, Object> getNetworkStatus() {
        try {
            initializeConnection();
            
            Map<String, Object> status = new HashMap<>(networkStatus);
            status.put("connected", isConnected());
            status.put("networkUrl", blockchainConfig.getNetwork().getUrl());
            status.put("chainId", blockchainConfig.getNetwork().getChainId());
            status.put("networkHealthy", isNetworkHealthy);
            status.put("reconnectAttempts", reconnectAttempts);
            
            if (isConnected()) {
                status.put("currentBlockNumber", getCurrentBlockNumber());
                try {
                    status.put("networkVersion", web3j.netVersion().send().getNetVersion());
                    status.put("peerCount", web3j.netPeerCount().send().getQuantity());
                } catch (IOException e) {
                    log.debug("获取网络详细信息失败", e);
                }
            }
            
            // 添加隐私保护配置状态
            status.put("privacyConfig", getPrivacyConfigStatus());
            
            return status;
            
        } catch (Exception e) {
            log.error("获取网络状态失败", e);
            Map<String, Object> status = new HashMap<>();
            status.put("connected", false);
            status.put("error", e.getMessage());
            return status;
        }
    }
    
    /**
     * 获取隐私保护配置状态
     */
    private Map<String, Object> getPrivacyConfigStatus() {
        Map<String, Object> privacyStatus = new HashMap<>();
        privacyStatus.put("zkProofEnabled", blockchainConfig.getPrivacy().isEnableZkProof());
        privacyStatus.put("homomorphicEncryptionEnabled", blockchainConfig.getPrivacy().isEnableHomomorphicEncryption());
        privacyStatus.put("dataMinimizationEnabled", blockchainConfig.getPrivacy().isEnableDataMinimization());
        privacyStatus.put("hashAlgorithm", blockchainConfig.getPrivacy().getHashAlgorithm());
        privacyStatus.put("activeHomomorphicKeys", homomorphicKeys.size());
        return privacyStatus;
    }
    
    /**
     * 清理资源
     */
    public void cleanup() {
        try {
            if (networkMonitor != null && !networkMonitor.isShutdown()) {
                networkMonitor.shutdown();
                if (!networkMonitor.awaitTermination(10, TimeUnit.SECONDS)) {
                    networkMonitor.shutdownNow();
                }
            }
            
            if (web3j != null) {
                web3j.shutdown();
            }
            
            homomorphicKeys.clear();
            log.info("区块链集成组件资源清理完成");
            
        } catch (Exception e) {
            log.error("清理资源失败", e);
        }
    }
}