#include "ipSplitTunnelingController.h"
#include "core/utils/networkUtilities.h"
#include <QJsonObject>

IpSplitTunnelingController::IpSplitTunnelingController(SecureAppSettingsRepository* appSettingsRepository, QObject* parent)
    : QObject(parent),
      m_appSettingsRepository(appSettingsRepository)
{
    m_currentRouteMode = m_appSettingsRepository->routeMode();
    if (m_currentRouteMode == RouteMode::VpnAllSites) { // for old split tunneling configs
        m_appSettingsRepository->setRouteMode(RouteMode::VpnOnlyForwardSites);
        m_currentRouteMode = RouteMode::VpnOnlyForwardSites;
    }
    fillSites();
}

bool IpSplitTunnelingController::addSiteInternal(const QString &hostname, const QString &ip)
{
    QVariantMap existing = m_appSettingsRepository->vpnSites(m_currentRouteMode);
    if (existing.contains(hostname) && ip.isEmpty()) {
        return false;
    }

    for (int i = 0; i < m_sites.size(); i++) {
        if (m_sites[i].first == hostname && (m_sites[i].second.isEmpty() && !ip.isEmpty())) {
            m_sites[i].second = ip;
            m_appSettingsRepository->addVpnSite(m_currentRouteMode, hostname, ip);
            return true;
        } else if (m_sites[i].first == hostname && (m_sites[i].second == ip)) {
            return false;
        }
    }
    m_sites.append(qMakePair(hostname, ip));
    m_appSettingsRepository->addVpnSite(m_currentRouteMode, hostname, ip);
    return true;
}

void IpSplitTunnelingController::addSites(const QMap<QString, QString> &sites, bool replaceExisting)
{
    if (replaceExisting) {
        m_sites.clear();
    }
    for (auto it = sites.constBegin(); it != sites.constEnd(); ++it) {
        const QString &hostname = it.key();
        const QString &ip = it.value();
        bool found = false;
        for (int i = 0; i < m_sites.size(); i++) {
            if (m_sites[i].first == hostname) {
                if (!ip.isEmpty()) {
                    m_sites[i].second = ip;
                }
                found = true;
                break;
            }
        }
        if (!found) {
            m_sites.append(qMakePair(hostname, ip));
        }
    }
    if (replaceExisting) {
        m_appSettingsRepository->removeAllVpnSites(m_currentRouteMode);
    }
    m_appSettingsRepository->addVpnSites(m_currentRouteMode, sites);
}

bool IpSplitTunnelingController::addSite(const QString &hostname)
{
    QString normalizedHostname = normalizeHostname(hostname);
    
    if (!validateHostname(normalizedHostname)) {
        return false;
    }
    
    if (NetworkUtilities::ipAddressWithSubnetRegExp().exactMatch(normalizedHostname)) {
        processSite(normalizedHostname, "");
        return true;
    }
    
    if (addSiteInternal(normalizedHostname, "")) {
        QHostInfo::lookupHost(normalizedHostname, this, SLOT(onHostResolved(QHostInfo)));
        return true;
    }
    
    return false;
}

bool IpSplitTunnelingController::removeSite(const QString &hostname)
{
    for (int i = 0; i < m_sites.size(); i++) {
        if (m_sites[i].first == hostname) {
            m_sites.removeAt(i);
            m_appSettingsRepository->removeVpnSite(m_currentRouteMode, hostname);
            return true;
        }
    }
    return false;
}

void IpSplitTunnelingController::removeSites()
{
    m_sites.clear();
    m_appSettingsRepository->removeAllVpnSites(m_currentRouteMode);
}

void IpSplitTunnelingController::setRouteMode(RouteMode routeMode)
{
    m_currentRouteMode = routeMode;
    fillSites();
    m_appSettingsRepository->setRouteMode(routeMode);
}

void IpSplitTunnelingController::toggleSplitTunneling(bool enabled)
{
    m_appSettingsRepository->setSitesSplitTunnelingEnabled(enabled);
}

RouteMode IpSplitTunnelingController::getRouteMode() const
{
    return m_currentRouteMode;
}

bool IpSplitTunnelingController::isSplitTunnelingEnabled() const
{
    return m_appSettingsRepository->isSitesSplitTunnelingEnabled();
}

QVector<QPair<QString, QString>> IpSplitTunnelingController::getCurrentSites() const
{
    return m_sites;
}

void IpSplitTunnelingController::fillSites()
{
    QVariantMap sitesMap = m_appSettingsRepository->vpnSites(m_currentRouteMode);
    m_sites.clear();
    for (auto it = sitesMap.begin(); it != sitesMap.end(); ++it) {
        m_sites.append(qMakePair(it.key(), it.value().toString()));
    }
}

QString IpSplitTunnelingController::normalizeHostname(const QString &hostname) const
{
    QString normalized = hostname;
    normalized.replace("https://", "");
    normalized.replace("http://", "");
    normalized.replace("ftp://", "");
    normalized = normalized.split("/", Qt::SkipEmptyParts).first();
    return normalized;
}

bool IpSplitTunnelingController::validateHostname(const QString &hostname) const
{
    if (hostname.isEmpty()) {
        return false;
    }
    if (!hostname.contains(".") && !NetworkUtilities::ipAddressWithSubnetRegExp().exactMatch(hostname)) {
        return false;
    }
    return true;
}


void IpSplitTunnelingController::onHostResolved(const QHostInfo &hostInfo)
{
    const QList<QHostAddress> &addresses = hostInfo.addresses();
    QString hostname = hostInfo.hostName();
    
    for (const QHostAddress &addr : addresses) {
        if (addr.protocol() == QAbstractSocket::NetworkLayerProtocol::IPv4Protocol) {
            processSiteAfterResolve(hostname, addr.toString());
            break;
        }
    }
}

void IpSplitTunnelingController::processSiteAfterResolve(const QString &hostname, const QString &ip)
{
    for (int i = 0; i < m_sites.size(); i++) {
        if (m_sites[i].first == hostname && m_sites[i].second.isEmpty()) {
            m_sites[i].second = ip;
            m_appSettingsRepository->addVpnSite(m_currentRouteMode, hostname, ip);
            break;
        }
    }
}

void IpSplitTunnelingController::processSite(const QString &hostname, const QString &ip)
{
    addSiteInternal(hostname, ip);
}

bool IpSplitTunnelingController::importSitesFromJson(const QByteArray& jsonData, bool replaceExisting, QString &errorMessage)
{
    QJsonParseError parseError;
    QJsonDocument jsonDocument = QJsonDocument::fromJson(jsonData, &parseError);
    
    if (parseError.error != QJsonParseError::NoError) {
        errorMessage = tr("Failed to parse JSON data: %1").arg(parseError.errorString());
        return false;
    }
    
    if (!jsonDocument.isArray()) {
        errorMessage = tr("The JSON data is not an array");
        return false;
    }
    
    QJsonArray jsonArray = jsonDocument.array();
    QMap<QString, QString> sites;
    
    for (auto jsonValue : jsonArray) {
        QJsonObject jsonObject = jsonValue.toObject();
        QString hostname = jsonObject.value("hostname").toString("");
        QString ip = jsonObject.value("ip").toString("");
        
        QString normalizedHostname = normalizeHostname(hostname);
        
        if (!validateHostname(normalizedHostname)) {
            qDebug() << normalizedHostname << " not look like ip adress or domain name";
            continue;
        }
        
        sites.insert(normalizedHostname, ip);
    }
    
    addSites(sites, replaceExisting);
    
    return true;
}

QByteArray IpSplitTunnelingController::exportSitesToJson() const
{
    QVector<QPair<QString, QString>> sites = getCurrentSites();
    QJsonArray jsonArray;
    
    for (const auto &site : sites) {
        QJsonObject jsonObject;
        jsonObject["hostname"] = site.first;
        jsonObject["ip"] = site.second;
        jsonArray.append(jsonObject);
    }
    
    QJsonDocument jsonDocument(jsonArray);
    return jsonDocument.toJson();
}