#include "network_refresh_service.h"
#include "../util/logger.h"

#include <algorithm>
#include <cmath>
#include <cstdlib>
#include <map>
#include <set>

using json = nlohmann::json;

namespace dragonx {
namespace services {

namespace {

template <typename T>
std::optional<T> readOptional(const json& source, const char* key)
{
    try {
        if (source.contains(key)) return source[key].get<T>();
    } catch (...) {}
    return std::nullopt;
}

std::optional<double> readBalanceString(const json& source, const char* key)
{
    try {
        if (source.contains(key)) return std::stod(source[key].get<std::string>());
    } catch (...) {}
    return std::nullopt;
}

void applyBalancesFromUnspent(std::vector<AddressInfo>& addresses, const json& unspent)
{
    if (!unspent.is_array()) return;

    std::map<std::string, double> balances;
    for (const auto& output : unspent) {
        auto address = readOptional<std::string>(output, "address");
        auto amount = readOptional<double>(output, "amount");
        if (address && amount) balances[*address] += *amount;
    }

    for (auto& info : addresses) {
        auto balance = balances.find(info.address);
        if (balance != balances.end()) info.balance = balance->second;
    }
}

bool hasTransactionType(const std::vector<TransactionInfo>& transactions,
                        const std::string& txid,
                        const std::string& type)
{
    for (const auto& transaction : transactions) {
        if (transaction.txid == txid && transaction.type == type) return true;
    }
    return false;
}

bool tryFetchRawTransaction(NetworkRefreshService::RefreshRpcGateway& rpc,
                            const std::string& txid,
                            json& rawTransaction)
{
    try {
        rawTransaction = rpc.call("gettransaction", json::array({txid}));
        return !rawTransaction.is_null();
    } catch (...) {
        return false;
    }
}

void applyRawTransactionMetadata(TransactionInfo& info,
                                 const json& rawTransaction,
                                 bool includeSendDetails)
{
    if (rawTransaction.is_null()) return;

    if (auto value = readOptional<std::int64_t>(rawTransaction, "time")) info.timestamp = *value;
    else if (auto value = readOptional<std::int64_t>(rawTransaction, "timereceived")) info.timestamp = *value;
    if (auto value = readOptional<int>(rawTransaction, "confirmations")) info.confirmations = *value;

    if (!includeSendDetails) return;

    if (auto value = readOptional<double>(rawTransaction, "amount")) info.amount = *value;

    if (!rawTransaction.contains("details") || !rawTransaction["details"].is_array()) return;
    for (const auto& detail : rawTransaction["details"]) {
        auto category = readOptional<std::string>(detail, "category");
        if (!category || *category != "send") continue;

        if (auto value = readOptional<double>(detail, "amount")) info.amount = *value;
        if (auto value = readOptional<std::string>(detail, "address")) info.address = *value;
        break;
    }
}

void applyRawTransactionMetadata(NetworkRefreshService::TransactionViewCacheEntry& entry,
                                 const json& rawTransaction)
{
    if (rawTransaction.is_null()) return;

    if (auto value = readOptional<std::int64_t>(rawTransaction, "time")) entry.timestamp = *value;
    else if (auto value = readOptional<std::int64_t>(rawTransaction, "timereceived")) entry.timestamp = *value;
    if (auto value = readOptional<int>(rawTransaction, "confirmations")) entry.confirmations = *value;
}

void appendTrackedSendPlaceholder(std::vector<TransactionInfo>& transactions,
                                  const std::string& txid,
                                  const json* rawTransaction)
{
    if (hasTransactionType(transactions, txid, "send")) return;

    TransactionInfo info;
    info.txid = txid;
    info.type = "send";
    if (rawTransaction) applyRawTransactionMetadata(info, *rawTransaction, true);
    transactions.push_back(std::move(info));
}

void appendMissingPreviousTransactions(std::vector<TransactionInfo>& transactions,
                                       const std::vector<TransactionInfo>& previousTransactions,
                                       bool includeAll,
                                       const std::unordered_set<std::string>& pinnedTxids)
{
    for (const auto& transaction : previousTransactions) {
        bool pinned = pinnedTxids.find(transaction.txid) != pinnedTxids.end();
        if (!includeAll && !pinned) {
            bool shieldedRelated = (!transaction.address.empty() && transaction.address[0] == 'z') ||
                                   (!transaction.from_address.empty() && transaction.from_address[0] == 'z') ||
                                   !transaction.memo.empty();
            if (!shieldedRelated) continue;
        }
        if (hasTransactionType(transactions, transaction.txid, transaction.type)) continue;
        transactions.push_back(transaction);
    }
}

} // namespace

NetworkRefreshService::ConnectionInfoResult NetworkRefreshService::parseConnectionInfoResult(const json& info)
{
    ConnectionInfoResult result;
    if (!info.is_object()) return result;

    result.ok = true;
    result.daemonVersion = readOptional<int>(info, "version");
    result.protocolVersion = readOptional<int>(info, "protocolversion");
    result.p2pPort = readOptional<int>(info, "p2pport");
    result.longestChain = readOptional<int>(info, "longestchain");
    result.notarized = readOptional<int>(info, "notarized");
    result.blocks = readOptional<int>(info, "blocks");
    return result;
}

NetworkRefreshService::WalletEncryptionResult NetworkRefreshService::parseWalletEncryptionResult(const json& walletInfo)
{
    WalletEncryptionResult result;
    if (!walletInfo.is_object()) return result;

    result.ok = true;
    result.encrypted = walletInfo.contains("unlocked_until");
    if (result.encrypted) {
        try {
            result.unlockedUntil = walletInfo["unlocked_until"].get<std::int64_t>();
        } catch (...) {
            result.ok = false;
        }
    }
    return result;
}

NetworkRefreshService::WarmupPollResult NetworkRefreshService::collectWarmupPollResult(RefreshRpcGateway& rpc)
{
    WarmupPollResult result;
    try {
        json info = rpc.call("getinfo", json::array());
        result.ready = true;
        result.info = parseConnectionInfoResult(info);
    } catch (const std::exception& e) {
        result.errorMessage = e.what();
    }
    return result;
}

NetworkRefreshService::ConnectionInitResult NetworkRefreshService::collectConnectionInitResult(
    RefreshRpcGateway& rpc,
    const std::optional<ConnectionInfoResult>& prefetchedInfo)
{
    ConnectionInitResult result;

    if (prefetchedInfo && prefetchedInfo->ok) {
        result.info = *prefetchedInfo;
    } else {
        try {
            json info = rpc.call("getinfo", json::array());
            result.info = parseConnectionInfoResult(info);
        } catch (...) {}
    }

    try {
        json walletInfo = rpc.call("getwalletinfo", json::array());
        result.encryption = parseWalletEncryptionResult(walletInfo);
    } catch (...) {}

    return result;
}

NetworkRefreshService::CoreRefreshResult NetworkRefreshService::parseCoreRefreshResult(
    const json& totalBalance, bool balanceOk, const json& blockInfo, bool blockOk)
{
    CoreRefreshResult result;
    result.balanceOk = balanceOk && totalBalance.is_object();
    if (result.balanceOk) {
        result.shieldedBalance = readBalanceString(totalBalance, "private");
        result.transparentBalance = readBalanceString(totalBalance, "transparent");
        result.totalBalance = readBalanceString(totalBalance, "total");
    }

    result.blockchainOk = blockOk && blockInfo.is_object();
    if (result.blockchainOk) {
        result.blocks = readOptional<int>(blockInfo, "blocks");
        result.headers = readOptional<int>(blockInfo, "headers");
        result.bestBlockHash = readOptional<std::string>(blockInfo, "bestblockhash");
        result.verificationProgress = readOptional<double>(blockInfo, "verificationprogress");
        result.longestChain = readOptional<int>(blockInfo, "longestchain");
        result.notarized = readOptional<int>(blockInfo, "notarized");
    }
    return result;
}

NetworkRefreshService::CoreRefreshResult NetworkRefreshService::collectCoreRefreshResult(RefreshRpcGateway& rpc)
{
    json totalBalance;
    json blockInfo;
    bool balanceOk = false;
    bool blockOk = false;

    try {
        totalBalance = rpc.call("z_gettotalbalance", json::array());
        balanceOk = true;
    } catch (const std::exception& e) {
        DEBUG_LOGF("Balance error: %s\n", e.what());
    }

    try {
        blockInfo = rpc.call("getblockchaininfo", json::array());
        blockOk = true;
    } catch (const std::exception& e) {
        DEBUG_LOGF("BlockchainInfo error: %s\n", e.what());
    }

    return parseCoreRefreshResult(totalBalance, balanceOk, blockInfo, blockOk);
}

NetworkRefreshService::MiningRefreshResult NetworkRefreshService::parseMiningRefreshResult(
    const json& miningInfo, bool miningOk, const json& localHashrate, bool hashrateOk, double daemonMemoryMb)
{
    MiningRefreshResult result;
    result.daemonMemoryMb = daemonMemoryMb;

    if (hashrateOk) {
        try {
            result.localHashrate = localHashrate.get<double>();
        } catch (...) {}
    }

    result.miningOk = miningOk && miningInfo.is_object();
    if (result.miningOk) {
        result.generate = readOptional<bool>(miningInfo, "generate");
        result.genproclimit = readOptional<int>(miningInfo, "genproclimit");
        result.blocks = readOptional<int>(miningInfo, "blocks");
        result.difficulty = readOptional<double>(miningInfo, "difficulty");
        result.networkHashrate = readOptional<double>(miningInfo, "networkhashps");
        result.chain = readOptional<std::string>(miningInfo, "chain");
    }
    return result;
}

NetworkRefreshService::MiningRefreshResult NetworkRefreshService::collectMiningRefreshResult(
    RefreshRpcGateway& rpc,
    double daemonMemoryMb,
    bool includeSlowRefresh,
    bool includeLocalHashrate)
{
    json miningInfo;
    json localHashrate;
    bool miningOk = false;
    bool hashrateOk = false;

    if (includeLocalHashrate) {
        try {
            localHashrate = rpc.call("getlocalsolps", json::array());
            hashrateOk = true;
        } catch (const std::exception& e) {
            DEBUG_LOGF("getLocalHashrate error: %s\n", e.what());
        }
    }

    if (includeSlowRefresh) {
        try {
            miningInfo = rpc.call("getmininginfo", json::array());
            miningOk = true;
        } catch (const std::exception& e) {
            DEBUG_LOGF("getMiningInfo error: %s\n", e.what());
        }
    }

    return parseMiningRefreshResult(miningInfo, miningOk, localHashrate, hashrateOk, daemonMemoryMb);
}

NetworkRefreshService::PeerRefreshResult NetworkRefreshService::parsePeerRefreshResult(
    const json& peers, const json& bannedPeers)
{
    PeerRefreshResult result;

    if (peers.is_array()) {
        for (const auto& peer : peers) {
            PeerInfo info;
            if (auto value = readOptional<int>(peer, "id")) info.id = *value;
            if (auto value = readOptional<std::string>(peer, "addr")) info.addr = *value;
            if (auto value = readOptional<std::string>(peer, "subver")) info.subver = *value;
            if (auto value = readOptional<std::string>(peer, "services")) info.services = *value;
            if (auto value = readOptional<int>(peer, "version")) info.version = *value;
            if (auto value = readOptional<std::int64_t>(peer, "conntime")) info.conntime = *value;
            if (auto value = readOptional<int>(peer, "banscore")) info.banscore = *value;
            if (auto value = readOptional<double>(peer, "pingtime")) info.pingtime = *value;
            if (auto value = readOptional<std::int64_t>(peer, "bytessent")) info.bytessent = *value;
            if (auto value = readOptional<std::int64_t>(peer, "bytesrecv")) info.bytesrecv = *value;
            if (auto value = readOptional<int>(peer, "startingheight")) info.startingheight = *value;
            if (auto value = readOptional<int>(peer, "synced_headers")) info.synced_headers = *value;
            if (auto value = readOptional<int>(peer, "synced_blocks")) info.synced_blocks = *value;
            if (auto value = readOptional<bool>(peer, "inbound")) info.inbound = *value;
            if (auto value = readOptional<std::string>(peer, "tls_cipher")) info.tls_cipher = *value;
            if (auto value = readOptional<bool>(peer, "tls_verified")) info.tls_verified = *value;
            result.peers.push_back(std::move(info));
        }
    }

    if (bannedPeers.is_array()) {
        for (const auto& ban : bannedPeers) {
            BannedPeer info;
            if (auto value = readOptional<std::string>(ban, "address")) info.address = *value;
            if (auto value = readOptional<std::int64_t>(ban, "banned_until")) info.banned_until = *value;
            result.bannedPeers.push_back(std::move(info));
        }
    }

    return result;
}

NetworkRefreshService::PeerRefreshResult NetworkRefreshService::collectPeerRefreshResult(RefreshRpcGateway& rpc)
{
    json peers = json::array();
    json bannedPeers = json::array();
    bool peersOk = false;
    bool bannedOk = false;

    try {
        peers = rpc.call("getpeerinfo", json::array());
        peersOk = true;
    } catch (const std::exception& e) {
        DEBUG_LOGF("getPeerInfo error: %s\n", e.what());
    }

    try {
        bannedPeers = rpc.call("listbanned", json::array());
        bannedOk = true;
    } catch (const std::exception& e) {
        DEBUG_LOGF("listBanned error: %s\n", e.what());
    }

    return parsePeerRefreshResult(peersOk ? peers : json::array(),
                                  bannedOk ? bannedPeers : json::array());
}

std::optional<NetworkRefreshService::PriceRefreshResult> NetworkRefreshService::parseCoinGeckoPriceResponse(
    const std::string& response, std::time_t fetchedAt)
{
    try {
        auto parsed = json::parse(response);
        if (!parsed.contains("dragonx-2")) return std::nullopt;

        const auto& data = parsed["dragonx-2"];
        PriceRefreshResult result;
        result.market.price_usd = data.value("usd", 0.0);
        result.market.price_btc = data.value("btc", 0.0);
        result.market.change_24h = data.value("usd_24h_change", 0.0);
        result.market.volume_24h = data.value("usd_24h_vol", 0.0);
        result.market.market_cap = data.value("usd_market_cap", 0.0);

        char buf[64];
        std::tm* tm = std::localtime(&fetchedAt);
        if (tm && std::strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm) > 0) {
            result.market.last_updated = buf;
        }
        return result;
    } catch (...) {
        return std::nullopt;
    }
}

NetworkRefreshService::PriceHttpResult NetworkRefreshService::parsePriceHttpResponse(
    const PriceHttpResponse& response,
    std::time_t fetchedAt)
{
    PriceHttpResult result;

    if (!response.transportOk || response.httpStatus != 200) {
        const std::string reason = response.transportOk ? "OK" : response.transportError;
        result.errorMessage = "Price fetch failed: " + reason +
            " (HTTP " + std::to_string(response.httpStatus) + ")";
        return result;
    }

    auto parsed = parseCoinGeckoPriceResponse(response.body, fetchedAt);
    if (!parsed) {
        result.errorMessage = "Price fetch returned an unrecognized response";
        return result;
    }

    result.price = std::move(*parsed);
    return result;
}

AddressInfo NetworkRefreshService::buildShieldedAddressInfo(const std::string& address,
                                                            const json& validation,
                                                            bool validationSucceeded)
{
    AddressInfo info;
    info.address = address;
    info.type = "shielded";

    if (!validationSucceeded) {
        info.has_spending_key = true;
        return info;
    }

    info.has_spending_key = false;
    if (auto isMine = readOptional<bool>(validation, "ismine")) {
        info.has_spending_key = *isMine;
    }
    return info;
}

AddressInfo NetworkRefreshService::buildTransparentAddressInfo(const std::string& address)
{
    AddressInfo info;
    info.address = address;
    info.type = "transparent";
    return info;
}

std::vector<AddressInfo> NetworkRefreshService::parseTransparentAddressList(const json& addressList)
{
    std::vector<AddressInfo> addresses;
    if (!addressList.is_array()) return addresses;

    for (const auto& addressJson : addressList) {
        try {
            addresses.push_back(buildTransparentAddressInfo(addressJson.get<std::string>()));
        } catch (...) {}
    }
    return addresses;
}

void NetworkRefreshService::applyShieldedBalancesFromUnspent(std::vector<AddressInfo>& addresses,
                                                             const json& unspent)
{
    applyBalancesFromUnspent(addresses, unspent);
}

void NetworkRefreshService::applyTransparentBalancesFromUnspent(std::vector<AddressInfo>& addresses,
                                                                const json& unspent)
{
    applyBalancesFromUnspent(addresses, unspent);
}

NetworkRefreshService::AddressRefreshSnapshot NetworkRefreshService::buildAddressRefreshSnapshot(const WalletState& state)
{
    AddressRefreshSnapshot snapshot;
    for (const auto& info : state.z_addresses) {
        if (!info.address.empty()) snapshot.shieldedSpendingKeys[info.address] = info.has_spending_key;
    }
    return snapshot;
}

NetworkRefreshService::AddressRefreshResult NetworkRefreshService::collectAddressRefreshResult(
    RefreshRpcGateway& rpc,
    const AddressRefreshSnapshot& snapshot)
{
    AddressRefreshResult result;

    try {
        json zList = rpc.call("z_listaddresses", json::array());
        if (zList.is_array()) {
            for (const auto& addressJson : zList) {
                std::string address;
                try {
                    address = addressJson.get<std::string>();
                } catch (...) {
                    continue;
                }

                auto cached = snapshot.shieldedSpendingKeys.find(address);
                if (cached != snapshot.shieldedSpendingKeys.end()) {
                    AddressInfo info;
                    info.address = address;
                    info.type = "shielded";
                    info.has_spending_key = cached->second;
                    result.shieldedAddresses.push_back(std::move(info));
                } else {
                    json validationResult;
                    bool validationSucceeded = false;
                    try {
                        validationResult = rpc.call("z_validateaddress", json::array({address}));
                        validationSucceeded = true;
                    } catch (...) {
                        // Older daemons can fail validation for wallet-owned addresses.
                    }
                    result.shieldedAddresses.push_back(
                        buildShieldedAddressInfo(address, validationResult, validationSucceeded));
                }
            }
        }
    } catch (const std::exception& e) {
        DEBUG_LOGF("z_listaddresses error: %s\n", e.what());
    }

    try {
        json unspent = rpc.call("z_listunspent", json::array());
        applyShieldedBalancesFromUnspent(result.shieldedAddresses, unspent);
    } catch (const std::exception& e) {
        DEBUG_LOGF("z_listunspent unavailable (%s), falling back to z_getbalance\n", e.what());
        for (auto& info : result.shieldedAddresses) {
            try {
                json balance = rpc.call("z_getbalance", json::array({info.address}));
                if (!balance.is_null()) info.balance = balance.get<double>();
            } catch (...) {}
        }
    }

    try {
        json tList = rpc.call("getaddressesbyaccount", json::array({""}));
        result.transparentAddresses = parseTransparentAddressList(tList);
    } catch (const std::exception& e) {
        DEBUG_LOGF("getaddressesbyaccount error: %s\n", e.what());
    }

    try {
        json unspent = rpc.call("listunspent", json::array());
        applyTransparentBalancesFromUnspent(result.transparentAddresses, unspent);
    } catch (const std::exception& e) {
        DEBUG_LOGF("listunspent error: %s\n", e.what());
    }

    return result;
}

NetworkRefreshService::TransactionRefreshSnapshot NetworkRefreshService::buildTransactionRefreshSnapshot(
    const WalletState& state,
    const TransactionViewCache& viewTxCache,
    const std::unordered_set<std::string>& sendTxids)
{
    TransactionRefreshSnapshot snapshot;

    for (const auto& address : state.z_addresses) {
        if (!address.address.empty()) snapshot.shieldedAddresses.push_back(address.address);
    }

    for (const auto& cachedView : viewTxCache) {
        snapshot.fullyEnrichedTxids.insert(cachedView.first);
    }
    for (const auto& transaction : state.transactions) {
        if (transaction.confirmations > 6 && transaction.timestamp != 0 && !transaction.txid.empty()) {
            snapshot.fullyEnrichedTxids.insert(transaction.txid);
        }
    }

    snapshot.viewTxCache = viewTxCache;
    snapshot.sendTxids = sendTxids;
    snapshot.previousTransactions = state.transactions;
    return snapshot;
}

void NetworkRefreshService::appendTransparentTransactions(std::vector<TransactionInfo>& transactions,
                                                          std::set<std::string>& knownTxids,
                                                          const json& result,
                                                          const std::set<std::string>& miningAddresses)
{
    if (!result.is_array()) return;

    for (const auto& transactionJson : result) {
        TransactionInfo info;
        if (auto value = readOptional<std::string>(transactionJson, "txid")) info.txid = *value;
        if (auto value = readOptional<std::string>(transactionJson, "category")) info.type = *value;
        if (auto value = readOptional<double>(transactionJson, "amount")) info.amount = *value;
        if (auto value = readOptional<std::int64_t>(transactionJson, "time")) {
            info.timestamp = *value;
        } else if (auto received = readOptional<std::int64_t>(transactionJson, "timereceived")) {
            info.timestamp = *received;
        }
        if (auto value = readOptional<int>(transactionJson, "confirmations")) info.confirmations = *value;
        if (auto value = readOptional<std::string>(transactionJson, "address")) info.address = *value;
        if (info.type == "receive" && !info.address.empty() && miningAddresses.count(info.address)) {
            info.type = "mined";
        }
        if (!info.txid.empty()) knownTxids.insert(info.txid);
        transactions.push_back(std::move(info));
    }
}

void NetworkRefreshService::appendShieldedReceivedTransactions(std::vector<TransactionInfo>& transactions,
                                                               std::set<std::string>& knownTxids,
                                                               const std::string& address,
                                                               const json& received,
                                                               const std::set<std::string>& miningAddresses)
{
    if (received.is_null() || !received.is_array()) return;

    for (const auto& note : received) {
        auto txid = readOptional<std::string>(note, "txid");
        if (!txid || txid->empty()) continue;

        auto change = readOptional<bool>(note, "change");
        if (change && *change) continue;

        bool dominated = false;
        for (const auto& existing : transactions) {
            if (existing.txid == *txid && existing.type == "receive") {
                dominated = true;
                break;
            }
        }
        if (dominated) continue;

        TransactionInfo info;
        info.txid = *txid;
        info.type = miningAddresses.count(address) ? "mined" : "receive";
        info.address = address;
        if (auto value = readOptional<double>(note, "amount")) info.amount = *value;
        if (auto value = readOptional<int>(note, "confirmations")) info.confirmations = *value;
        if (auto value = readOptional<std::int64_t>(note, "time")) info.timestamp = *value;
        if (auto value = readOptional<std::string>(note, "memoStr")) info.memo = *value;
        knownTxids.insert(*txid);
        transactions.push_back(std::move(info));
    }
}

NetworkRefreshService::TransactionViewCacheEntry NetworkRefreshService::parseViewTransactionCacheEntry(
    const json& viewTransaction)
{
    TransactionViewCacheEntry entry;
    if (!viewTransaction.is_object()) return entry;

    if (viewTransaction.contains("spends") && viewTransaction["spends"].is_array()) {
        for (const auto& spend : viewTransaction["spends"]) {
            if (auto address = readOptional<std::string>(spend, "address")) {
                entry.from_address = *address;
                break;
            }
        }
    }

    if (viewTransaction.contains("outputs") && viewTransaction["outputs"].is_array()) {
        for (const auto& output : viewTransaction["outputs"]) {
            bool outgoing = false;
            if (auto value = readOptional<bool>(output, "outgoing")) outgoing = *value;
            if (!outgoing) continue;

            TransactionViewCacheEntry::Output out;
            if (auto value = readOptional<std::string>(output, "address")) out.address = *value;
            if (auto value = readOptional<double>(output, "value")) out.value = *value;
            if (auto value = readOptional<std::string>(output, "memoStr")) out.memo = *value;
            entry.outgoing_outputs.push_back(std::move(out));
        }
    }

    return entry;
}

void NetworkRefreshService::appendViewTransactionOutputs(std::vector<TransactionInfo>& transactions,
                                                         const std::string& txid,
                                                         const TransactionViewCacheEntry& entry)
{
    for (const auto& out : entry.outgoing_outputs) {
        bool alreadyTracked = false;
        for (const auto& existing : transactions) {
            if (existing.txid == txid && existing.type == "send" &&
                std::abs(existing.amount + out.value) < 0.00000001) {
                alreadyTracked = true;
                break;
            }
        }
        if (alreadyTracked) continue;

        TransactionInfo info;
        info.txid = txid;
        info.type = "send";
        info.address = out.address;
        info.amount = -out.value;
        info.memo = out.memo;
        info.from_address = entry.from_address;
        bool foundExistingMetadata = false;
        for (const auto& existing : transactions) {
            if (existing.txid == txid) {
                info.confirmations = existing.confirmations;
                info.timestamp = existing.timestamp;
                foundExistingMetadata = true;
                break;
            }
        }
        if (!foundExistingMetadata) {
            info.confirmations = entry.confirmations;
            info.timestamp = entry.timestamp;
        }
        transactions.push_back(std::move(info));
    }
}

void NetworkRefreshService::sortTransactionsNewestFirst(std::vector<TransactionInfo>& transactions)
{
    std::sort(transactions.begin(), transactions.end(),
        [](const TransactionInfo& left, const TransactionInfo& right) {
            return left.timestamp > right.timestamp;
        });
}

NetworkRefreshService::TransactionRefreshResult NetworkRefreshService::collectTransactionRefreshResult(
    RefreshRpcGateway& rpc,
    const TransactionRefreshSnapshot& snapshot,
    int currentBlockHeight,
    int maxViewTransactionsPerCycle)
{
    TransactionRefreshResult result;
    result.blockHeight = currentBlockHeight;
    result.shieldedAddressCount = snapshot.shieldedAddresses.size();
    result.shieldedScanHeights = snapshot.shieldedScanHeights;

    std::set<std::string> knownTxids;

    bool transactionRpcError = false;
    try {
        constexpr int pageSize = 1000;
        int skip = 0;
        while (true) {
            json transactions = rpc.call("listtransactions", json::array({"", pageSize, skip}));
            appendTransparentTransactions(result.transactions, knownTxids, transactions, snapshot.miningAddresses);
            if (!transactions.is_array() || transactions.size() < static_cast<std::size_t>(pageSize)) break;
            skip += pageSize;
        }
    } catch (const std::exception& e) {
        transactionRpcError = true;
        DEBUG_LOGF("listtransactions error: %s\n", e.what());
    }

    auto scannedAtTip = [&](const std::string& address) {
        if (currentBlockHeight < 0) return false;
        auto it = result.shieldedScanHeights.find(address);
        return it != result.shieldedScanHeights.end() && it->second >= currentBlockHeight;
    };

    std::size_t shieldedStart = snapshot.shieldedScanStartIndex;
    if (shieldedStart >= snapshot.shieldedAddresses.size()) shieldedStart = 0;
    std::size_t nextSearchIndex = shieldedStart;

    for (std::size_t index = shieldedStart; index < snapshot.shieldedAddresses.size(); ++index) {
        const auto& address = snapshot.shieldedAddresses[index];
        if (scannedAtTip(address)) {
            nextSearchIndex = index + 1;
            continue;
        }
        if (snapshot.maxShieldedReceiveScans > 0 &&
            result.shieldedAddressesScanned >= snapshot.maxShieldedReceiveScans) {
            nextSearchIndex = index;
            break;
        }
        ++result.shieldedAddressesScanned;
        nextSearchIndex = index + 1;
        try {
            json received = rpc.call("z_listreceivedbyaddress", json::array({address, 0}));
            appendShieldedReceivedTransactions(result.transactions, knownTxids, address, received, snapshot.miningAddresses);
            if (currentBlockHeight >= 0) result.shieldedScanHeights[address] = currentBlockHeight;
        } catch (const std::exception& e) {
            transactionRpcError = true;
            DEBUG_LOGF("z_listreceivedbyaddress error: %s\n", e.what());
        }
    }

    auto findPendingShieldedIndex = [&]() -> std::optional<std::size_t> {
        if (snapshot.shieldedAddresses.empty()) return std::nullopt;
        std::size_t start = nextSearchIndex < snapshot.shieldedAddresses.size() ? nextSearchIndex : 0;
        for (std::size_t offset = 0; offset < snapshot.shieldedAddresses.size(); ++offset) {
            std::size_t index = (start + offset) % snapshot.shieldedAddresses.size();
            if (!scannedAtTip(snapshot.shieldedAddresses[index])) return index;
        }
        return std::nullopt;
    };

    auto pendingShieldedIndex = findPendingShieldedIndex();
    result.shieldedScanComplete = !pendingShieldedIndex.has_value();
    result.nextShieldedScanStartIndex = pendingShieldedIndex.value_or(0);

    for (const auto& txid : snapshot.sendTxids) {
        knownTxids.insert(txid);
    }

    for (const auto& [txid, cachedView] : snapshot.viewTxCache) {
        if (!cachedView.outgoing_outputs.empty()) knownTxids.insert(txid);
    }

    int viewTxCount = 0;
    for (const auto& txid : knownTxids) {
        bool trackedSend = snapshot.sendTxids.count(txid) > 0;

        auto cached = snapshot.viewTxCache.find(txid);
        if (cached != snapshot.viewTxCache.end()) {
            if (!trackedSend || !cached->second.outgoing_outputs.empty()) {
                appendViewTransactionOutputs(result.transactions, txid, cached->second);
                continue;
            }
        }

        if (!trackedSend && snapshot.fullyEnrichedTxids.count(txid)) continue;

        if (viewTxCount >= maxViewTransactionsPerCycle) break;
        ++viewTxCount;

        try {
            json viewTransaction = rpc.call("z_viewtransaction", json::array({txid}));
            if (viewTransaction.is_null() || !viewTransaction.is_object()) {
                if (trackedSend) {
                    json rawTransaction;
                    bool hasRawTransaction = tryFetchRawTransaction(rpc, txid, rawTransaction);
                    appendTrackedSendPlaceholder(result.transactions,
                                                 txid,
                                                 hasRawTransaction ? &rawTransaction : nullptr);
                }
                continue;
            }

            auto entry = parseViewTransactionCacheEntry(viewTransaction);
            appendViewTransactionOutputs(result.transactions, txid, entry);

            json rawTransaction;
            bool hasRawTransaction = false;
            bool needsRawTransaction = false;
            for (const auto& info : result.transactions) {
                if (info.txid == txid && info.timestamp == 0) {
                    needsRawTransaction = true;
                    break;
                }
            }
            if (needsRawTransaction) {
                hasRawTransaction = tryFetchRawTransaction(rpc, txid, rawTransaction);
                if (hasRawTransaction) {
                    applyRawTransactionMetadata(entry, rawTransaction);
                    for (auto& info : result.transactions) {
                        if (info.txid == txid && info.timestamp == 0) {
                            applyRawTransactionMetadata(info, rawTransaction, false);
                        }
                    }
                }
            }

            if (trackedSend && !hasTransactionType(result.transactions, txid, "send")) {
                if (!hasRawTransaction) hasRawTransaction = tryFetchRawTransaction(rpc, txid, rawTransaction);
                appendTrackedSendPlaceholder(result.transactions,
                                             txid,
                                             hasRawTransaction ? &rawTransaction : nullptr);
            }

            if (!trackedSend || !entry.outgoing_outputs.empty()) {
                result.newViewTxEntries[txid] = std::move(entry);
            }
        } catch (const std::exception& e) {
            (void)e;
            if (trackedSend) {
                json rawTransaction;
                bool hasRawTransaction = tryFetchRawTransaction(rpc, txid, rawTransaction);
                appendTrackedSendPlaceholder(result.transactions,
                                             txid,
                                             hasRawTransaction ? &rawTransaction : nullptr);
            }
        }
    }

    if (!snapshot.previousTransactions.empty()) {
        if (transactionRpcError) {
            appendMissingPreviousTransactions(result.transactions, snapshot.previousTransactions, true, snapshot.pendingOpids);
        } else if (snapshot.shieldedAddresses.empty() || !result.shieldedScanComplete ||
                   result.shieldedAddressesScanned < result.shieldedAddressCount) {
            appendMissingPreviousTransactions(result.transactions, snapshot.previousTransactions, false, snapshot.pendingOpids);
        }
    }

    sortTransactionsNewestFirst(result.transactions);
    return result;
}

NetworkRefreshService::TransactionRefreshResult NetworkRefreshService::collectRecentTransactionRefreshResult(
    RefreshRpcGateway& rpc,
    const TransactionRefreshSnapshot& snapshot,
    int currentBlockHeight,
    int pageSize)
{
    TransactionRefreshResult result;
    result.blockHeight = currentBlockHeight;
    result.transactions = snapshot.previousTransactions;
    result.shieldedAddressCount = snapshot.shieldedAddresses.size();
    result.shieldedScanHeights = snapshot.shieldedScanHeights;

    try {
        std::set<std::string> recentTxids;
        std::vector<TransactionInfo> recentTransactions;
        json transactions = rpc.call("listtransactions", json::array({"", pageSize, 0}));
        appendTransparentTransactions(recentTransactions, recentTxids, transactions, snapshot.miningAddresses);

        for (auto& recent : recentTransactions) {
            bool replaced = false;
            for (auto& existing : result.transactions) {
                if (existing.txid == recent.txid && existing.type == recent.type) {
                    existing = recent;
                    replaced = true;
                    break;
                }
            }
            if (!replaced) result.transactions.push_back(std::move(recent));
        }
    } catch (const std::exception& e) {
        DEBUG_LOGF("recent listtransactions error: %s\n", e.what());
    }

    std::size_t shieldedStart = snapshot.shieldedScanStartIndex;
    if (shieldedStart >= snapshot.shieldedAddresses.size()) shieldedStart = 0;
    std::size_t shieldedLimit = snapshot.shieldedAddresses.size() - shieldedStart;
    if (snapshot.maxShieldedReceiveScans > 0) {
        shieldedLimit = std::min(shieldedLimit, snapshot.maxShieldedReceiveScans);
    }

    for (std::size_t index = shieldedStart; index < shieldedStart + shieldedLimit; ++index) {
        const auto& address = snapshot.shieldedAddresses[index];
        try {
            std::vector<TransactionInfo> scannedTransactions;
            std::set<std::string> scannedTxids;
            json received = rpc.call("z_listreceivedbyaddress", json::array({address, 0}));
            appendShieldedReceivedTransactions(scannedTransactions, scannedTxids, address, received, snapshot.miningAddresses);
            for (auto& scanned : scannedTransactions) {
                bool replaced = false;
                for (auto& existing : result.transactions) {
                    if (existing.txid == scanned.txid && existing.type == scanned.type) {
                        existing = scanned;
                        replaced = true;
                        break;
                    }
                }
                if (!replaced) result.transactions.push_back(std::move(scanned));
            }
            if (currentBlockHeight >= 0) result.shieldedScanHeights[address] = currentBlockHeight;
            ++result.shieldedAddressesScanned;
        } catch (const std::exception& e) {
            DEBUG_LOGF("recent z_listreceivedbyaddress error: %s\n", e.what());
        }
    }

    result.nextShieldedScanStartIndex =
        (shieldedStart + shieldedLimit >= snapshot.shieldedAddresses.size()) ? 0 : shieldedStart + shieldedLimit;
    result.shieldedScanComplete = true;

    sortTransactionsNewestFirst(result.transactions);
    return result;
}

NetworkRefreshService::OperationStatusPollResult NetworkRefreshService::parseOperationStatusPoll(
    const json& result,
    const std::vector<std::string>& requestedOpids)
{
    OperationStatusPollResult parsed;
    if (!result.is_array()) return parsed;

    std::set<std::string> reported;
    for (const auto& op : result) {
        if (!op.is_object()) continue;
        std::string opid = op.value("id", std::string());
        if (opid.empty()) continue;
        reported.insert(opid);

        std::string status = op.value("status", std::string());
        if (status == "success") {
            parsed.doneOpids.push_back(opid);
            parsed.anySuccess = true;
            if (op.contains("result") && op["result"].is_object() && op["result"].contains("txid")) {
                try {
                    std::string txid = op["result"]["txid"].get<std::string>();
                    if (!txid.empty()) {
                        parsed.successTxids.push_back(txid);
                        parsed.successTxidsByOpid[opid] = std::move(txid);
                    }
                } catch (...) {}
            }
        } else if (status == "failed" || status == "cancelled" || status == "canceled") {
            parsed.doneOpids.push_back(opid);
            std::string msg = status == "failed" ? "Transaction failed" : "Transaction cancelled";
            if (op.contains("error") && op["error"].is_object() && op["error"].contains("message")) {
                try {
                    msg = op["error"]["message"].get<std::string>();
                } catch (...) {}
            }
            parsed.failureMessages.push_back(msg);
        }
    }

    for (const auto& opid : requestedOpids) {
        if (!opid.empty() && reported.find(opid) == reported.end()) {
            parsed.staleOpids.push_back(opid);
        }
    }

    return parsed;
}

void NetworkRefreshService::applyConnectionInfoResult(WalletState& state, const ConnectionInfoResult& result)
{
    if (!result.ok) return;

    if (result.daemonVersion) state.daemon_version = *result.daemonVersion;
    if (result.protocolVersion) state.protocol_version = *result.protocolVersion;
    if (result.p2pPort) state.p2p_port = *result.p2pPort;
    if (result.longestChain && *result.longestChain > 0) state.longestchain = *result.longestChain;
    if (result.notarized) state.notarized = *result.notarized;
    if (result.blocks) state.sync.blocks = *result.blocks;
    if (state.longestchain > 0 && state.sync.blocks > state.longestchain) state.longestchain = state.sync.blocks;
}

void NetworkRefreshService::applyWalletEncryptionResult(WalletState& state, const WalletEncryptionResult& result)
{
    if (!result.ok) return;

    if (result.encrypted) {
        state.encrypted = true;
        state.unlocked_until = result.unlockedUntil;
        state.locked = (result.unlockedUntil == 0);
    } else {
        state.encrypted = false;
        state.locked = false;
        state.unlocked_until = 0;
    }
    state.encryption_state_known = true;
}

void NetworkRefreshService::applyConnectionInitResult(WalletState& state, const ConnectionInitResult& result)
{
    applyConnectionInfoResult(state, result.info);
    applyWalletEncryptionResult(state, result.encryption);
}

void NetworkRefreshService::applyCoreRefreshResult(WalletState& state,
                                                   const CoreRefreshResult& result,
                                                   std::time_t updatedAt)
{
    if (result.balanceOk) {
        if (result.shieldedBalance) state.shielded_balance = *result.shieldedBalance;
        if (result.transparentBalance) state.transparent_balance = *result.transparentBalance;
        if (result.totalBalance) state.total_balance = *result.totalBalance;
        state.last_balance_update = updatedAt;
    }

    if (!result.blockchainOk) return;

    if (result.blocks) state.sync.blocks = *result.blocks;
    if (result.headers) state.sync.headers = *result.headers;
    if (result.bestBlockHash) state.sync.best_blockhash = *result.bestBlockHash;
    if (result.verificationProgress) state.sync.verification_progress = *result.verificationProgress;
    if (result.longestChain && *result.longestChain > 0) state.longestchain = *result.longestChain;
    if (state.longestchain > 0 && state.sync.blocks > state.longestchain) state.longestchain = state.sync.blocks;
    if (state.longestchain > 0)
        state.sync.syncing = (state.sync.blocks < state.longestchain - 2);
    else
        state.sync.syncing = (state.sync.blocks < state.sync.headers - 2);
    if (result.notarized) state.notarized = *result.notarized;
}

void NetworkRefreshService::applyMiningRefreshResult(WalletState& state,
                                                     const MiningRefreshResult& result,
                                                     std::time_t updatedAt)
{
    if (result.localHashrate) {
        state.mining.localHashrate = *result.localHashrate;
        state.mining.hashrate_history.push_back(state.mining.localHashrate);
        if (state.mining.hashrate_history.size() > MiningInfo::MAX_HISTORY) {
            state.mining.hashrate_history.erase(state.mining.hashrate_history.begin());
        }
    }

    if (result.miningOk) {
        if (result.generate) state.mining.generate = *result.generate;
        if (result.genproclimit) state.mining.genproclimit = *result.genproclimit;
        if (result.blocks) state.mining.blocks = *result.blocks;
        if (result.difficulty) state.mining.difficulty = *result.difficulty;
        if (result.networkHashrate) state.mining.networkHashrate = *result.networkHashrate;
        if (result.chain) state.mining.chain = *result.chain;
        state.last_mining_update = updatedAt;
    }

    state.mining.daemon_memory_mb = result.daemonMemoryMb;
}

void NetworkRefreshService::applyPeerRefreshResult(WalletState& state,
                                                   PeerRefreshResult&& result,
                                                   std::time_t updatedAt)
{
    state.peers = std::move(result.peers);
    state.bannedPeers = std::move(result.bannedPeers);
    state.last_peer_update = updatedAt;
}

void NetworkRefreshService::markPriceRefreshStarted(WalletState& state)
{
    state.market.price_loading = true;
    state.market.price_error.clear();
}

void NetworkRefreshService::applyPriceRefreshResult(WalletState& state,
                                                    const PriceRefreshResult& result,
                                                    std::chrono::steady_clock::time_point fetchedAt)
{
    state.market.price_loading = false;
    state.market.price_error.clear();
    state.market.price_usd = result.market.price_usd;
    state.market.price_btc = result.market.price_btc;
    state.market.change_24h = result.market.change_24h;
    state.market.volume_24h = result.market.volume_24h;
    state.market.market_cap = result.market.market_cap;
    state.market.last_updated = result.market.last_updated;
    state.market.last_fetch_time = fetchedAt;

    state.market.price_history.push_back(result.market.price_usd);
    if (state.market.price_history.size() > MarketInfo::MAX_HISTORY) {
        state.market.price_history.erase(state.market.price_history.begin());
    }
}

void NetworkRefreshService::applyPriceRefreshFailure(WalletState& state,
                                                     const std::string& errorMessage)
{
    state.market.price_loading = false;
    state.market.price_error = errorMessage.empty()
        ? std::string("Price fetch failed")
        : errorMessage;
}

void NetworkRefreshService::applyAddressRefreshResult(WalletState& state,
                                                      AddressRefreshResult&& result)
{
    state.z_addresses = std::move(result.shieldedAddresses);
    state.t_addresses = std::move(result.transparentAddresses);
}

void NetworkRefreshService::applyTransactionRefreshResult(WalletState& state,
                                                          TransactionCacheUpdate cacheUpdate,
                                                          TransactionRefreshResult&& result,
                                                          std::time_t updatedAt)
{
    state.transactions = std::move(result.transactions);
    state.last_tx_update = updatedAt;
    cacheUpdate.lastTxBlockHeight = result.blockHeight;

    for (auto& [txid, entry] : result.newViewTxEntries) {
        bool hasOutgoingOutputs = !entry.outgoing_outputs.empty();
        cacheUpdate.viewTxCache[txid] = std::move(entry);
        if (hasOutgoingOutputs) cacheUpdate.sendTxids.erase(txid);
    }

    cacheUpdate.confirmedTxCache.clear();
    cacheUpdate.confirmedTxIds.clear();
    for (const auto& tx : state.transactions) {
        if (tx.confirmations >= 10 && tx.timestamp != 0) {
            cacheUpdate.confirmedTxIds.insert(tx.txid);
            cacheUpdate.confirmedTxCache.push_back(tx);
        }
    }
    cacheUpdate.confirmedCacheBlock = result.blockHeight;
}

bool NetworkRefreshService::shouldRefreshTransactions(int lastTxBlockHeight,
                                                      int currentBlockHeight,
                                                      bool transactionsDirty) const
{
    return scheduler_.shouldRefreshTransactions(lastTxBlockHeight,
                                                currentBlockHeight,
                                                transactionsDirty);
}

bool NetworkRefreshService::beginJob(Job job)
{
    return beginDispatch(job).accepted;
}

bool NetworkRefreshService::beginJob(Job job, std::size_t queuedWork, std::size_t maxQueuedWork)
{
    return beginDispatch(job, queuedWork, maxQueuedWork).accepted;
}

void NetworkRefreshService::finishJob(Job job)
{
    jobFlag(job).store(false, std::memory_order_release);
}

bool NetworkRefreshService::jobInProgress(Job job) const
{
    return jobFlag(job).load(std::memory_order_acquire);
}

void NetworkRefreshService::resetJobs()
{
    coreInProgress_.store(false, std::memory_order_release);
    addressesInProgress_.store(false, std::memory_order_release);
    transactionsInProgress_.store(false, std::memory_order_release);
    miningInProgress_.store(false, std::memory_order_release);
    peersInProgress_.store(false, std::memory_order_release);
    priceInProgress_.store(false, std::memory_order_release);
    encryptionInProgress_.store(false, std::memory_order_release);
    connectionInitInProgress_.store(false, std::memory_order_release);
}

NetworkRefreshService::DispatchTicket NetworkRefreshService::beginDispatch(
    Job job, std::size_t queuedWork, std::size_t maxQueuedWork)
{
    std::size_t index = jobIndex(job);
    lastQueueDepth_[index].store(queuedWork, std::memory_order_release);
    if (maxQueuedWork > 0 && queuedWork >= maxQueuedWork) {
        skippedQueuePressure_[index].fetch_add(1, std::memory_order_relaxed);
        return {job, generations_[index].load(std::memory_order_acquire), false};
    }

    bool expected = false;
    if (!jobFlag(job).compare_exchange_strong(expected, true, std::memory_order_acq_rel)) {
        skippedInFlight_[index].fetch_add(1, std::memory_order_relaxed);
        return {job, generations_[index].load(std::memory_order_acquire), false};
    }

    std::uint64_t generation = generations_[index].fetch_add(1, std::memory_order_acq_rel) + 1;
    started_[index].fetch_add(1, std::memory_order_relaxed);
    return {job, generation, true};
}

bool NetworkRefreshService::completeDispatch(const DispatchTicket& ticket)
{
    if (!ticket.accepted) return false;
    std::size_t index = jobIndex(ticket.job);
    if (generations_[index].load(std::memory_order_acquire) != ticket.generation) {
        staleCallbacks_[index].fetch_add(1, std::memory_order_relaxed);
        return false;
    }
    jobFlag(ticket.job).store(false, std::memory_order_release);
    finished_[index].fetch_add(1, std::memory_order_relaxed);
    return true;
}

void NetworkRefreshService::cancelDispatch(const DispatchTicket& ticket)
{
    if (!ticket.accepted) return;
    std::size_t index = jobIndex(ticket.job);
    if (generations_[index].load(std::memory_order_acquire) == ticket.generation) {
        jobFlag(ticket.job).store(false, std::memory_order_release);
    } else {
        staleCallbacks_[index].fetch_add(1, std::memory_order_relaxed);
    }
}

NetworkRefreshService::JobStats NetworkRefreshService::stats(Job job) const
{
    std::size_t index = jobIndex(job);
    return {
        started_[index].load(std::memory_order_acquire),
        finished_[index].load(std::memory_order_acquire),
        skippedInFlight_[index].load(std::memory_order_acquire),
        skippedQueuePressure_[index].load(std::memory_order_acquire),
        staleCallbacks_[index].load(std::memory_order_acquire),
        lastQueueDepth_[index].load(std::memory_order_acquire)
    };
}

std::atomic<bool>& NetworkRefreshService::jobFlag(Job job)
{
    switch (job) {
        case Job::Core:         return coreInProgress_;
        case Job::Addresses:    return addressesInProgress_;
        case Job::Transactions: return transactionsInProgress_;
        case Job::Mining:       return miningInProgress_;
        case Job::Peers:        return peersInProgress_;
        case Job::Price:        return priceInProgress_;
        case Job::Encryption:   return encryptionInProgress_;
        case Job::ConnectionInit: return connectionInitInProgress_;
        case Job::Count:        return coreInProgress_;
    }
    return coreInProgress_;
}

const std::atomic<bool>& NetworkRefreshService::jobFlag(Job job) const
{
    switch (job) {
        case Job::Core:         return coreInProgress_;
        case Job::Addresses:    return addressesInProgress_;
        case Job::Transactions: return transactionsInProgress_;
        case Job::Mining:       return miningInProgress_;
        case Job::Peers:        return peersInProgress_;
        case Job::Price:        return priceInProgress_;
        case Job::Encryption:   return encryptionInProgress_;
        case Job::ConnectionInit: return connectionInitInProgress_;
        case Job::Count:        return coreInProgress_;
    }
    return coreInProgress_;
}

std::size_t NetworkRefreshService::jobIndex(Job job)
{
    std::size_t index = static_cast<std::size_t>(job);
    constexpr std::size_t count = static_cast<std::size_t>(Job::Count);
    return index < count ? index : 0;
}

} // namespace services
} // namespace dragonx