#include "serversModel.h"

#include <QHash>
#include <QSet>
#include <QJsonDocument>

#include "core/models/serverConfig.h"
#include "core/utils/api/apiEnums.h"
#include "core/utils/constants/apiKeys.h"
#include "core/utils/constants/apiConstants.h"
#include "core/utils/selfhosted/sshSession.h"
#include "core/utils/networkUtilities.h"

#if defined(Q_OS_IOS) || defined(MACOS_NE)
    #include <AmneziaVPN-Swift.h>
#endif

#include "core/utils/api/apiUtils.h"

using namespace amnezia;

namespace
{
    namespace configKey
    {
        constexpr char apiConfig[] = "api_config";
        constexpr char serviceInfo[] = "service_info";
        constexpr char availableCountries[] = "available_countries";
        constexpr char serverCountryCode[] = "server_country_code";
        constexpr char serverCountryName[] = "server_country_name";
        constexpr char userCountryCode[] = "user_country_code";
        constexpr char serviceType[] = "service_type";
        constexpr char serviceProtocol[] = "service_protocol";

        constexpr char publicKeyInfo[] = "public_key";
        constexpr char expiresAt[] = "expires_at";

        constexpr char xraySubscriptionConfig[] = "xray_subscription_config";
        constexpr char xraySubscriptionConfigName[] = "xray_subscription_config_name";
        constexpr char xraySubscriptionConfigCurrent[] = "xray_subscription_config_current";
    }

    QString normalizeVpnKey(const QString &vpnKey)
    {
        QString normalized = vpnKey.trimmed();
        if (normalized.startsWith(QStringLiteral("vpn://"), Qt::CaseInsensitive)) {
            normalized = normalized.mid(QStringLiteral("vpn://").size());
        }
        return normalized;
    }
}

ServersModel::ServersModel(QObject *parent) : QAbstractListModel(parent)
{
    connect(this, &ServersModel::defaultServerIndexChanged, this, &ServersModel::defaultServerNameChanged);

    connect(this, &ServersModel::defaultServerIndexChanged, this, [this](const int serverIndex) {
        if (serverIndex < 0 || serverIndex >= m_servers.size()) {
            return;
        }
        auto defaultContainer = m_servers.at(serverIndex).defaultContainer();
        emit ServersModel::defaultServerDefaultContainerChanged(defaultContainer);
        emit ServersModel::defaultServerNameChanged();
    });

    connect(this, &ServersModel::processedServerIndexChanged, this, &ServersModel::processedServerChanged);
}

int ServersModel::rowCount(const QModelIndex &parent) const
{
    Q_UNUSED(parent);
    return static_cast<int>(m_servers.size());
}

QVariant ServersModel::data(const QModelIndex &index, int role) const
{
    if (!index.isValid() || index.row() < 0 || index.row() >= static_cast<int>(m_servers.size())) {
        return QVariant();
    }

    const ServerConfig &server = m_servers.at(index.row());
    const int configVersion = server.configVersion();
    
    switch (role) {
    case NameRole: {
        if (configVersion) {
            if (server.isApiV1()) {
                return server.as<ApiV1ServerConfig>()->name;
            } else if (server.isApiV2()) {
                return server.as<ApiV2ServerConfig>()->name;
            }
        }
        QString name = server.description();
        if (name.isEmpty()) {
            return server.hostName();
        }
        return name;
    }
    case ServerDescriptionRole: {
        auto description = getServerDescription(server, index.row());
        return configVersion ? description : server.isXRayConfig() ? description : description + server.hostName();
    }
    case HostNameRole: return server.hostName();
    case CredentialsRole: return QVariant::fromValue(serverCredentials(index.row()));
    case CredentialsLoginRole: return serverCredentials(index.row()).userName;
    case IsDefaultRole: return index.row() == m_defaultServerIndex;
    case IsCurrentlyProcessedRole: return index.row() == m_processedServerIndex;
    case HasWriteAccessRole: {
        auto credentials = serverCredentials(index.row());
        return (!credentials.userName.isEmpty() && !credentials.secretData.isEmpty());
    }
    case ContainsAmneziaDnsRole: {
        QString primaryDns = server.dns1();
        return primaryDns == protocols::dns::amneziaDnsIp;
    }
    case DefaultContainerRole: {
        return server.defaultContainer();
    }
    case HasInstalledContainers: {
        return serverHasInstalledContainers(index.row());
    }
    case IsServerFromTelegramApiRole: {
        return configVersion == apiDefs::ConfigSource::Telegram;
    }
    case IsServerFromGatewayApiRole: {
        return configVersion == apiDefs::ConfigSource::AmneziaGateway;
    }
    case ApiConfigRole: {
        return QVariant();
    }
    case IsCountrySelectionAvailableRole: {
        if (server.isApiV2()) {
            return !server.as<ApiV2ServerConfig>()->apiConfig.availableCountries.isEmpty();
        }
        return false;
    }
    case ApiAvailableCountriesRole: {
        if (server.isApiV2()) {
            return server.as<ApiV2ServerConfig>()->apiConfig.availableCountries;
        }
        return QJsonArray();
    }
    case ApiServerCountryCodeRole: {
        if (server.isApiV2()) {
            return server.as<ApiV2ServerConfig>()->apiConfig.serverCountryCode;
        }
        return QString();
    }
    case HasAmneziaDns: {
        QString primaryDns = server.dns1();
        return primaryDns == protocols::dns::amneziaDnsIp;
    }
    case IsAdVisibleRole: {
        if (server.isApiV2()) {
            return server.as<ApiV2ServerConfig>()->apiConfig.serviceInfo.isAdVisible;
        }
        return false;
    }
    case AdHeaderRole: {
        if (server.isApiV2()) {
            return server.as<ApiV2ServerConfig>()->apiConfig.serviceInfo.adHeader;
        }
        return QString();
    }
    case AdDescriptionRole: {
        if (server.isApiV2()) {
            return server.as<ApiV2ServerConfig>()->apiConfig.serviceInfo.adDescription;
        }
        return QString();
    }
    case AdEndpointRole: {
        if (server.isApiV2()) {
            return server.as<ApiV2ServerConfig>()->apiConfig.serviceInfo.adEndpoint;
        }
        return QString();
    }
    case IsRenewalAvailableRole: {
        if (server.isApiV2()) {
            return server.as<ApiV2ServerConfig>()->apiConfig.serviceInfo.isRenewalAvailable;
        }
        return false;
    }
    case IsSubscriptionExpiredRole: {
        if (!server.isApiV2()) {
            return false;
        }

        const ApiConfig &apiConfig = server.as<ApiV2ServerConfig>()->apiConfig;
        if (apiConfig.isInAppPurchase) {
            return false;
        }
        if (apiConfig.subscriptionExpiredByServer) {
            return true;
        }
        if (apiConfig.subscription.endDate.isEmpty()) {
            return false;
        }
        return apiUtils::isSubscriptionExpired(apiConfig.subscription.endDate);
    }
    case IsSubscriptionExpiringSoonRole: {
        if (!server.isApiV2()) {
            return false;
        }

        const ApiConfig &apiConfig = server.as<ApiV2ServerConfig>()->apiConfig;
        if (apiConfig.isInAppPurchase) {
            return false;
        }
        if (apiConfig.subscription.endDate.isEmpty()) {
            return false;
        }
        return apiUtils::isSubscriptionExpiringSoon(apiConfig.subscription.endDate);
    }
    case IsXRayConfigSelectionAvailableRole: {
        if (server.isXRayConfig()) {
            return !server.as<XRaySubscriptionConfig>()->configString.isEmpty();
        }
    }
    }

    return QVariant();
}

QVariant ServersModel::data(const int index, int role) const
{
    QModelIndex modelIndex = this->index(index);
    return data(modelIndex, role);
}

void ServersModel::updateModel(const QVector<ServerConfig> &servers, int defaultServerIndex, bool isAmneziaDnsEnabled)
{
    beginResetModel();
    m_servers = servers;
    m_defaultServerIndex = defaultServerIndex;
    m_isAmneziaDnsEnabled = isAmneziaDnsEnabled;
    endResetModel();
    emit defaultServerIndexChanged(m_defaultServerIndex);
    emit processedServerChanged();
}

const int ServersModel::getDefaultServerIndex()
{
    return m_defaultServerIndex;
}

QString ServersModel::getServerDescription(const ServerConfig &server, const int index) const
{
    const int configVersion = server.configVersion();
    QString description;

    if (server.isApiV2()) {
        const ApiV2ServerConfig *apiV2 = server.as<ApiV2ServerConfig>();
        if (apiV2 && !apiV2->apiConfig.serverCountryCode.isEmpty()) {
            return apiV2->apiConfig.serverCountryName;
        }
        return apiV2 ? apiV2->description : server.description();
    } else if (server.isApiV1()) {
        const ApiV1ServerConfig *apiV1 = server.as<ApiV1ServerConfig>();
        return apiV1 ? apiV1->description : server.description();
    } else if (server.isXRayConfig()) {
        const XRaySubscriptionConfig *xray = server.as<XRaySubscriptionConfig>();
        return xray ? xray->configName.at(xray->currentConfig).toString() : server.description();
    } else if (data(index, HasWriteAccessRole).toBool()) {
        QMap<DockerContainer, ContainerConfig> containers = server.containers();
        bool isDnsInstalled = containers.contains(DockerContainer::Dns);
        if (m_isAmneziaDnsEnabled && isDnsInstalled) {
            description += "Amnezia DNS | ";
        }
    } else {
        if (data(index, HasAmneziaDns).toBool()) {
            description += "Amnezia DNS | ";
        }
    }
    return description;
}

const int ServersModel::getServersCount()
{
    return m_servers.size();
}

bool ServersModel::hasServerWithWriteAccess()
{
    for (size_t i = 0; i < getServersCount(); i++) {
        if (qvariant_cast<bool>(data(i, HasWriteAccessRole))) {
            return true;
        }
    }
    return false;
}

void ServersModel::setProcessedServerIndex(const int index)
{
    if (m_processedServerIndex != index) {
        m_processedServerIndex = index;
        emit processedServerIndexChanged(m_processedServerIndex);
    }
}

const ServerCredentials ServersModel::getProcessedServerCredentials()
{
    return serverCredentials(m_processedServerIndex);
}

bool ServersModel::isDefaultServerCurrentlyProcessed()
{
    return m_defaultServerIndex == m_processedServerIndex;
}

bool ServersModel::isDefaultServerFromApi()
{
    return data(m_defaultServerIndex, IsServerFromTelegramApiRole).toBool()
            || data(m_defaultServerIndex, IsServerFromGatewayApiRole).toBool();
}

bool ServersModel::isDefaultServerContainXRayConfigs()
{
    return data(m_defaultServerIndex, IsXRayConfigSelectionAvailableRole).toBool();
}

bool ServersModel::isProcessedServerHasWriteAccess()
{
    return qvariant_cast<bool>(data(m_processedServerIndex, HasWriteAccessRole));
}

bool ServersModel::isDefaultServerHasWriteAccess()
{
    return qvariant_cast<bool>(data(m_defaultServerIndex, HasWriteAccessRole));
}

QHash<int, QByteArray> ServersModel::roleNames() const
{
    QHash<int, QByteArray> roles;

    roles[NameRole] = "name";
    roles[ServerDescriptionRole] = "serverDescription";
    roles[CollapsedServerDescriptionRole] = "collapsedServerDescription";
    roles[ExpandedServerDescriptionRole] = "expandedServerDescription";

    roles[HostNameRole] = "hostName";

    roles[CredentialsRole] = "credentials";
    roles[CredentialsLoginRole] = "credentialsLogin";

    roles[IsDefaultRole] = "isDefault";
    roles[IsCurrentlyProcessedRole] = "isCurrentlyProcessed";

    roles[HasWriteAccessRole] = "hasWriteAccess";

    roles[ContainsAmneziaDnsRole] = "containsAmneziaDns";

    roles[DefaultContainerRole] = "defaultContainer";
    roles[HasInstalledContainers] = "hasInstalledContainers";

    roles[IsServerFromTelegramApiRole] = "isServerFromTelegramApi";
    roles[IsServerFromGatewayApiRole] = "isServerFromGatewayApi";
    roles[ApiConfigRole] = "apiConfig";
    roles[IsCountrySelectionAvailableRole] = "isCountrySelectionAvailable";
    roles[ApiAvailableCountriesRole] = "apiAvailableCountries";
    roles[ApiServerCountryCodeRole] = "apiServerCountryCode";

    roles[IsAdVisibleRole] = "isAdVisible";
    roles[AdHeaderRole] = "adHeader";
    roles[AdDescriptionRole] = "adDescription";
    roles[AdEndpointRole] = "adEndpoint";
    roles[IsRenewalAvailableRole] = "isRenewalAvailable";
    roles[IsSubscriptionExpiredRole] = "isSubscriptionExpired";
    roles[IsSubscriptionExpiringSoonRole] = "isSubscriptionExpiringSoon";

    roles[IsXRayConfigSelectionAvailableRole] = "isXRayConfigSelectionAvailable";

    return roles;
}

ServerCredentials ServersModel::serverCredentials(int index) const
{
    if (index < 0 || index >= m_servers.size()) {
        return ServerCredentials();
    }
    const ServerConfig &server = m_servers.at(index);
    
    if (server.isSelfHosted()) {
        const SelfHostedServerConfig *selfHosted = server.as<SelfHostedServerConfig>();
        if (selfHosted) {
            ServerCredentials credentials;
            credentials.hostName = selfHosted->hostName;
            credentials.userName = selfHosted->userName.value_or("");
            credentials.secretData = selfHosted->password.value_or("");
            credentials.port = selfHosted->port.value_or(22);
            return credentials;
        }
    }
    
    return ServerCredentials();
}

bool ServersModel::isServerFromApi(const int serverIndex)
{
    return data(serverIndex, IsServerFromTelegramApiRole).toBool()
            || data(serverIndex, IsServerFromGatewayApiRole).toBool();
}

QVariant ServersModel::getDefaultServerData(const QString roleString)
{
    auto roles = roleNames();
    for (auto it = roles.begin(); it != roles.end(); it++) {
        if (QString(it.value()) == roleString) {
            return data(m_defaultServerIndex, it.key());
        }
    }

    return {};
}

QVariant ServersModel::getProcessedServerData(const QString &roleString)
{
    auto roles = roleNames();
    for (auto it = roles.begin(); it != roles.end(); it++) {
        if (QString(it.value()) == roleString) {
            return data(m_processedServerIndex, it.key());
        }
    }

    return {};
}


bool ServersModel::serverHasInstalledContainers(const int serverIndex) const
{
    const ServerConfig &server = m_servers.at(serverIndex);
    QMap<DockerContainer, ContainerConfig> containers = server.containers();
    
    for (auto it = containers.begin(); it != containers.end(); ++it) {
        DockerContainer container = it.key();
        if (ContainerUtils::containerService(container) == ServiceType::Vpn) {
            return true;
        }
        if (container == DockerContainer::SSXray) {
            return true;
        }
    }
    return false;
}