#include <QApplication>
#include <QClipboard>
#include <QDebug>
#include <QDesktopServices>
#include <QFile>
#include <QHostInfo>
#include <QItemSelectionModel>
#include <QJsonDocument>
#include <QJsonObject>
#include <QKeyEvent>
#include <QMenu>
#include <QMetaEnum>
#include <QSysInfo>
#include <QThread>
#include <QTimer>
#include <QQmlFile>
#include <QMetaObject>
#include <QStandardPaths>

#include "amnezia_application.h"

#include "configurators/cloak_configurator.h"
#include "configurators/vpn_configurator.h"
#include "configurators/openvpn_configurator.h"
#include "configurators/shadowsocks_configurator.h"
#include "configurators/ssh_configurator.h"

#include "core/servercontroller.h"
#include "core/server_defs.h"
#include "core/errorstrings.h"

#include "containers/containers_defs.h"

#include "ui/qautostart.h"

#include "logger.h"
#include "version.h"
#include "uilogic.h"
#include "utilities.h"
#include "vpnconnection.h"
#include <functional>

#if defined Q_OS_MAC || defined Q_OS_LINUX
#include "ui/macos_util.h"
#endif

#ifdef Q_OS_ANDROID
#include "platforms/android/android_controller.h"
#endif

#include "platforms/ios/MobileUtils.h"

#include "pages_logic/AppSettingsLogic.h"
#include "pages_logic/GeneralSettingsLogic.h"
#include "pages_logic/NetworkSettingsLogic.h"
#include "pages_logic/NewServerProtocolsLogic.h"
#include "pages_logic/QrDecoderLogic.h"
#include "pages_logic/ServerConfiguringProgressLogic.h"
#include "pages_logic/ServerListLogic.h"
#include "pages_logic/ServerSettingsLogic.h"
#include "pages_logic/ServerContainersLogic.h"
#include "pages_logic/ShareConnectionLogic.h"
#include "pages_logic/SitesLogic.h"
#include "pages_logic/StartPageLogic.h"
#include "pages_logic/ViewConfigLogic.h"
#include "pages_logic/VpnLogic.h"
#include "pages_logic/WizardLogic.h"
#include "pages_logic/AdvancedServerSettingsLogic.h"
#include "pages_logic/ClientManagementLogic.h"
#include "pages_logic/ClientInfoLogic.h"

#include "pages_logic/protocols/CloakLogic.h"
#include "pages_logic/protocols/OpenVpnLogic.h"
#include "pages_logic/protocols/ShadowSocksLogic.h"
#include "pages_logic/protocols/OtherProtocolsLogic.h"
#include "pages_logic/protocols/WireGuardLogic.h"

using namespace amnezia;
using namespace PageEnumNS;

UiLogic::UiLogic(std::shared_ptr<Settings> settings, std::shared_ptr<VpnConfigurator> configurator,
    QObject *parent) :
    QObject(parent),
    m_settings(settings),
    m_configurator(configurator)
{
    m_containersModel = new ContainersModel(settings, this);
    m_protocolsModel = new ProtocolsModel(settings, this);
    m_clientManagementModel = new ClientManagementModel(this);
    m_vpnConnection = new VpnConnection(settings, configurator);
    m_vpnConnection->moveToThread(&m_vpnConnectionThread);
    m_vpnConnectionThread.start();


    m_protocolLogicMap.insert(Proto::OpenVpn, new OpenVpnLogic(this));
    m_protocolLogicMap.insert(Proto::ShadowSocks, new ShadowSocksLogic(this));
    m_protocolLogicMap.insert(Proto::Cloak, new CloakLogic(this));
    m_protocolLogicMap.insert(Proto::WireGuard, new WireGuardLogic(this));

    m_protocolLogicMap.insert(Proto::Dns, new OtherProtocolsLogic(this));
    m_protocolLogicMap.insert(Proto::Sftp, new OtherProtocolsLogic(this));
    m_protocolLogicMap.insert(Proto::TorWebSite, new OtherProtocolsLogic(this));

}

UiLogic::~UiLogic()
{
    emit hide();

#ifdef AMNEZIA_DESKTOP
    if (m_vpnConnection->connectionState() != VpnProtocol::VpnConnectionState::Disconnected) {
        m_vpnConnection->disconnectFromVpn();
        for (int i = 0; i < 50; i++) {
            qApp->processEvents(QEventLoop::ExcludeUserInputEvents);
            QThread::msleep(100);
            if (m_vpnConnection->isDisconnected()) {
                break;
            }
        }
    }
#endif

    m_vpnConnection->deleteLater();
    m_vpnConnectionThread.quit();
    m_vpnConnectionThread.wait(3000);

    qDebug() << "Application closed";
}

void UiLogic::initializeUiLogic()
{
#ifdef Q_OS_ANDROID
    connect(AndroidController::instance(), &AndroidController::initialized, [this](bool status, bool connected, const QDateTime& connectionDate) {
        if (connected) {
            pageLogic<VpnLogic>()->onConnectionStateChanged(VpnProtocol::Connected);
            m_vpnConnection->restoreConnection();
        }
    });
    if (!AndroidController::instance()->initialize(pageLogic<StartPageLogic>())) {
         qCritical() << QString("Init failed") ;
         emit VpnProtocol::Error;
         return;
    }
#endif

    m_notificationHandler = NotificationHandler::create(qmlRoot());

    connect(m_vpnConnection, &VpnConnection::connectionStateChanged, m_notificationHandler, &NotificationHandler::setConnectionState);
    connect(m_notificationHandler, &NotificationHandler::raiseRequested, this, &UiLogic::raise);
    connect(m_notificationHandler, &NotificationHandler::connectRequested, pageLogic<VpnLogic>(), &VpnLogic::onConnect);
    connect(m_notificationHandler, &NotificationHandler::disconnectRequested, pageLogic<VpnLogic>(), &VpnLogic::onDisconnect);

    if (m_settings->serversCount() > 0) {
        if (m_settings->defaultServerIndex() < 0) m_settings->setDefaultServer(0);
        emit goToPage(Page::Vpn, true, false);
    }
    else {
        emit goToPage(Page::Start, true, false);
    }

    m_selectedServerIndex = m_settings->defaultServerIndex();

    qInfo().noquote() << QString("Started %1 version %2").arg(APPLICATION_NAME).arg(APP_VERSION);
    qInfo().noquote() << QString("%1 (%2)").arg(QSysInfo::prettyProductName()).arg(QSysInfo::currentCpuArchitecture());
}

void UiLogic::showOnStartup()
{
    if (! m_settings->isStartMinimized()) {
        emit show();
    }
    else {
#ifdef Q_OS_WIN
        emit hide();
#elif defined Q_OS_MACX
    // TODO: fix: setDockIconVisible(false);
#endif
    }
}

void UiLogic::onUpdateAllPages()
{
    for (auto logic : m_logicMap) {
        if (dynamic_cast<ClientInfoLogic*>(logic) || dynamic_cast<ClientManagementLogic*>(logic)) {
            continue;
        }
        logic->onUpdatePage();
    }
}

void UiLogic::keyPressEvent(Qt::Key key)
{
    switch (key) {
    case Qt::Key_AsciiTilde:
    case Qt::Key_QuoteLeft: emit toggleLogPanel();
        break;
    case Qt::Key_L: Logger::openLogsFolder();
        break;
    case Qt::Key_K: Logger::openServiceLogsFolder();
        break;
#ifdef QT_DEBUG
    case Qt::Key_Q:
        qApp->quit();
        break;
    case Qt::Key_H:
        m_selectedServerIndex = m_settings->defaultServerIndex();
        m_selectedDockerContainer = m_settings->defaultContainer(m_selectedServerIndex);

        //updateSharingPage(selectedServerIndex, m_settings->serverCredentials(selectedServerIndex), selectedDockerContainer);
        emit goToPage(Page::ShareConnection);
        break;
#endif
    case Qt::Key_C:
        qDebug().noquote() << "Def server" << m_settings->defaultServerIndex() << m_settings->defaultContainerName(m_settings->defaultServerIndex());
        qDebug().noquote() << QJsonDocument(m_settings->defaultServer()).toJson();
        break;
    case Qt::Key_A:
        emit goToPage(Page::Start);
        break;
    case Qt::Key_S:
        m_selectedServerIndex = m_settings->defaultServerIndex();
        emit goToPage(Page::ServerSettings);
        break;
    case Qt::Key_P:
        onGotoCurrentProtocolsPage();
        break;
    case Qt::Key_T:
        m_configurator->sshConfigurator->openSshTerminal(m_settings->serverCredentials(m_settings->defaultServerIndex()));
        break;
    case Qt::Key_Escape:
        if (currentPage() == Page::Vpn) break;
        if (currentPage() == Page::ServerConfiguringProgress) break;
    case Qt::Key_Back:

//        if (currentPage() == Page::Start && pagesStack.size() < 2) break;
//        if (currentPage() == Page::Sites &&
//                ui->tableView_sites->selectionModel()->selection().indexes().size() > 0) {
//            ui->tableView_sites->clearSelection();
//            break;
//        }

            emit closePage();
        //}
    default:
        ;
    }
}

void UiLogic::onCloseWindow()
{
#ifdef Q_OS_ANDROID
    qApp->quit();
#else
    if (m_settings->serversCount() == 0)
    {
        qApp->quit();
    } else {
        emit hide();
    }
#endif
}

QString UiLogic::containerName(int container)
{
    return ContainerProps::containerHumanNames().value(static_cast<DockerContainer>(container));
}

QString UiLogic::containerDesc(int container)
{
    return ContainerProps::containerDescriptions().value(static_cast<DockerContainer>(container));

}

void UiLogic::onGotoCurrentProtocolsPage()
{
    m_selectedServerIndex = m_settings->defaultServerIndex();
    m_selectedDockerContainer = m_settings->defaultContainer(m_selectedServerIndex);
    emit goToPage(Page::ServerContainers);
}

void UiLogic::installServer(QPair<DockerContainer, QJsonObject> &container)
{
    emit goToPage(Page::ServerConfiguringProgress);
    QEventLoop loop;
    QTimer::singleShot(500, &loop, SLOT(quit()));
    loop.exec();
    qApp->processEvents();

    ServerConfiguringProgressLogic::PageFunc pageFunc;
    pageFunc.setEnabledFunc = [this] (bool enabled) -> void {
        pageLogic<ServerConfiguringProgressLogic>()->set_pageEnabled(enabled);
    };

    ServerConfiguringProgressLogic::ButtonFunc noButton;

    ServerConfiguringProgressLogic::LabelFunc waitInfoFunc;
    waitInfoFunc.setTextFunc = [this] (const QString& text) -> void {
        pageLogic<ServerConfiguringProgressLogic>()->set_labelWaitInfoText(text);
    };
    waitInfoFunc.setVisibleFunc = [this] (bool visible) -> void {
        pageLogic<ServerConfiguringProgressLogic>()->set_labelWaitInfoVisible(visible);
    };

    ServerConfiguringProgressLogic::ProgressFunc progressBarFunc;
    progressBarFunc.setVisibleFunc = [this] (bool visible) -> void {
        pageLogic<ServerConfiguringProgressLogic>()->set_progressBarVisible(visible);
    };
    progressBarFunc.setValueFunc = [this] (int value) -> void {
        pageLogic<ServerConfiguringProgressLogic>()->set_progressBarValue(value);
    };
    progressBarFunc.getValueFunc = [this] (void) -> int {
        return pageLogic<ServerConfiguringProgressLogic>()->progressBarValue();
    };
    progressBarFunc.getMaximumFunc = [this] (void) -> int {
        return pageLogic<ServerConfiguringProgressLogic>()->progressBarMaximum();
    };
    progressBarFunc.setTextVisibleFunc = [this] (bool visible) -> void {
        pageLogic<ServerConfiguringProgressLogic>()->set_progressBarTextVisible(visible);
    };
    progressBarFunc.setTextFunc = [this] (const QString& text) -> void {
        pageLogic<ServerConfiguringProgressLogic>()->set_progressBarText(text);
    };

    ServerConfiguringProgressLogic::LabelFunc busyInfoFunc;
    busyInfoFunc.setTextFunc = [this] (const QString& text) -> void {
        pageLogic<ServerConfiguringProgressLogic>()->set_labelServerBusyText(text);
    };
    busyInfoFunc.setVisibleFunc = [this] (bool visible) -> void {
        pageLogic<ServerConfiguringProgressLogic>()->set_labelServerBusyVisible(visible);
    };

    ServerConfiguringProgressLogic::ButtonFunc cancelButtonFunc;
    cancelButtonFunc.setVisibleFunc = [this] (bool visible) -> void {
        pageLogic<ServerConfiguringProgressLogic>()->set_pushButtonCancelVisible(visible);
    };

    bool isServerCreated = false;
    ErrorCode errorCode = addAlreadyInstalledContainersGui(isServerCreated);
    if (errorCode == ErrorCode::NoError) {
        if (!isContainerAlreadyAddedToGui(container.first)) {
            progressBarFunc.setTextFunc(QString("Installing %1").arg(ContainerProps::containerToString(container.first)));
            auto installAction = [&] () {
                ServerController serverController(m_settings);
                return serverController.setupContainer(m_installCredentials, container.first, container.second);
            };
            errorCode = pageLogic<ServerConfiguringProgressLogic>()->doInstallAction(installAction, pageFunc, progressBarFunc,
                                                                                     noButton, waitInfoFunc,
                                                                                     busyInfoFunc, cancelButtonFunc);
            if (errorCode == ErrorCode::NoError) {
                if (!isServerCreated) {
                    QJsonObject server;
                    server.insert(config_key::hostName, m_installCredentials.hostName);
                    server.insert(config_key::userName, m_installCredentials.userName);
                    server.insert(config_key::password, m_installCredentials.password);
                    server.insert(config_key::port, m_installCredentials.port);
                    server.insert(config_key::description, m_settings->nextAvailableServerName());

                    server.insert(config_key::containers, QJsonArray{container.second});
                    server.insert(config_key::defaultContainer, ContainerProps::containerToString(container.first));

                    m_settings->addServer(server);
                    m_settings->setDefaultServer(m_settings->serversCount() - 1);
                } else {
                    m_settings->setContainerConfig(m_settings->serversCount() - 1, container.first, container.second);
                    m_settings->setDefaultContainer(m_settings->serversCount() - 1, container.first);
                }
                onUpdateAllPages();

                emit setStartPage(Page::Vpn);
                qApp->processEvents();
                return;
            }
        } else {
            onUpdateAllPages();
            emit showWarningMessage("Attention! The container you are trying to install is already installed on the server. "
                                    "All installed containers have been added to the application ");
            emit setStartPage(Page::Vpn);
            return;
        }
    }
    emit showWarningMessage(tr("Error occurred while configuring server.") + "\n" +
                            tr("Error message: ") + errorString(errorCode) + "\n" +
                            tr("See logs for details."));
    emit closePage();
}

PageProtocolLogicBase *UiLogic::protocolLogic(Proto p)
{
    PageProtocolLogicBase *logic = m_protocolLogicMap.value(p);
    if (logic) return logic;
    else {
        qCritical() << "UiLogic::protocolLogic Warning: logic missing for" << p;
        return new PageProtocolLogicBase(this);
    }
}

QObject *UiLogic::qmlRoot() const
{
    return m_qmlRoot;
}

void UiLogic::setQmlRoot(QObject *newQmlRoot)
{
    m_qmlRoot = newQmlRoot;
}

NotificationHandler *UiLogic::notificationHandler() const
{
    return m_notificationHandler;
}

void UiLogic::setQmlContextProperty(PageLogicBase *logic)
{
    amnApp->qmlEngine()->rootContext()->setContextProperty(logic->metaObject()->className(), logic);
}

PageEnumNS::Page UiLogic::currentPage()
{
    return static_cast<PageEnumNS::Page>(currentPageValue());
}

void UiLogic::saveTextFile(const QString& desc, const QString& suggestedName, QString ext, const QString& data)
{
#ifdef Q_OS_IOS
    shareTempFile(suggestedName, ext, data);
    return;
#endif

    ext.replace("*", "");
    QString docDir = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation);
    QUrl fileName;
#ifdef AMNEZIA_DESKTOP
    fileName = QFileDialog::getSaveFileUrl(nullptr, desc,
        QUrl::fromLocalFile(docDir + "/" + suggestedName), "*" + ext);
    if (fileName.isEmpty()) return;
    if (!fileName.toString().endsWith(ext)) fileName = QUrl(fileName.toString() + ext);
#elif defined Q_OS_ANDROID
    qDebug() << "UiLogic::shareConfig" << data;
    AndroidController::instance()->shareConfig(data, suggestedName);
    return;
#endif

    if (fileName.isEmpty()) return;

#ifdef AMNEZIA_DESKTOP
    QFile save(fileName.toLocalFile());
#else
    QFile save(QQmlFile::urlToLocalFileOrQrc(fileName));
#endif

    save.open(QIODevice::WriteOnly);
    save.write(data.toUtf8());
    save.close();

    QFileInfo fi(fileName.toLocalFile());
    QDesktopServices::openUrl(fi.absoluteDir().absolutePath());
}

void UiLogic::saveBinaryFile(const QString &desc, QString ext, const QString &data)
{
    ext.replace("*", "");
    QString fileName = QFileDialog::getSaveFileName(nullptr, desc,
        QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation), "*" + ext);

    if (fileName.isEmpty()) return;
    if (!fileName.endsWith(ext)) fileName.append(ext);

    QFile save(fileName);
    save.open(QIODevice::WriteOnly);
    save.write(QByteArray::fromBase64(data.toUtf8()));
    save.close();

    QFileInfo fi(fileName);
    QDesktopServices::openUrl(fi.absoluteDir().absolutePath());
}

void UiLogic::copyToClipboard(const QString &text)
{
#ifdef Q_OS_ANDROID
    AndroidController::instance()->copyTextToClipboard(text);
#else
    qApp->clipboard()->setText(text);
#endif
}

void UiLogic::shareTempFile(const QString &suggestedName, QString ext, const QString& data) {
    ext.replace("*", "");
    QString fileName = QDir::tempPath() + "/" + suggestedName;

    if (fileName.isEmpty()) return;
    if (!fileName.endsWith(ext)) fileName.append(ext);

    QFile::remove(fileName);

    QFile save(fileName);
    save.open(QIODevice::WriteOnly);
    save.write(data.toUtf8());
    save.close();

    QStringList filesToSend;
    filesToSend.append(fileName);
    MobileUtils::shareText(filesToSend);
}

QString UiLogic::getOpenFileName(QWidget *parent, const QString &caption, const QString &dir,
    const QString &filter, QString *selectedFilter, QFileDialog::Options options)
{
    QString fileName = QFileDialog::getOpenFileName(parent, caption, dir, filter, selectedFilter, options);

#ifdef Q_OS_ANDROID
    // patch for files containing spaces etc
    const QString sep {"raw%3A%2F"};
    if (fileName.startsWith("content://") && fileName.contains(sep)) {
        QString contentUrl = fileName.split(sep).at(0);
        QString rawUrl = fileName.split(sep).at(1);
        rawUrl.replace(" ", "%20");
        fileName = contentUrl + sep + rawUrl;
    }
#endif
    return fileName;
}

void UiLogic::registerPagesLogic()
{
    amnApp->qmlEngine()->rootContext()->setContextProperty("UiLogic", this);

    registerPageLogic<AppSettingsLogic>();
    registerPageLogic<GeneralSettingsLogic>();
    registerPageLogic<NetworkSettingsLogic>();
    registerPageLogic<NewServerProtocolsLogic>();
    registerPageLogic<QrDecoderLogic>();
    registerPageLogic<ServerConfiguringProgressLogic>();
    registerPageLogic<ServerListLogic>();
    registerPageLogic<ServerSettingsLogic>();
    registerPageLogic<ServerContainersLogic>();
    registerPageLogic<ShareConnectionLogic>();
    registerPageLogic<SitesLogic>();
    registerPageLogic<StartPageLogic>();
    registerPageLogic<ViewConfigLogic>();
    registerPageLogic<VpnLogic>();
    registerPageLogic<WizardLogic>();
    registerPageLogic<ClientManagementLogic>();
    registerPageLogic<ClientInfoLogic>();
    registerPageLogic<AdvancedServerSettingsLogic>();
}

ErrorCode UiLogic::addAlreadyInstalledContainersGui(bool &isServerCreated)
{
    isServerCreated = false;
    ServerCredentials installCredentials = m_installCredentials;
    bool createNewServer = true;
    int serverIndex;

    for (int i = 0; i < m_settings->serversCount(); i++) {
        const ServerCredentials credentials = m_settings->serverCredentials(i);
        if (m_installCredentials.hostName == credentials.hostName && m_installCredentials.port == credentials.port) {
            createNewServer = false;
            isServerCreated = true;
            installCredentials = credentials;
            serverIndex = i;
            break;
        }
    }

    QMap<DockerContainer, QJsonObject> installedContainers;
    ServerController serverController(m_settings);
    ErrorCode errorCode = serverController.getAlreadyInstalledContainers(installCredentials, installedContainers);
    if (errorCode != ErrorCode::NoError) {
        return errorCode;
    }

    if (!installedContainers.empty()) {
        QJsonObject server;
        QJsonArray containerConfigs;
        if (createNewServer) {
            server.insert(config_key::hostName, installCredentials.hostName);
            server.insert(config_key::userName, installCredentials.userName);
            server.insert(config_key::password, installCredentials.password);
            server.insert(config_key::port, installCredentials.port);
            server.insert(config_key::description, m_settings->nextAvailableServerName());
        }

        for (auto container = installedContainers.begin(); container != installedContainers.end(); container++) {
            if (isContainerAlreadyAddedToGui(container.key())) {
                continue;
            }

            if (createNewServer) {
                containerConfigs.append(container.value());
                server.insert(config_key::containers, containerConfigs);
            } else {
                m_settings->setContainerConfig(serverIndex, container.key(), container.value());
                m_settings->setDefaultContainer(serverIndex, installedContainers.firstKey());
            }
        }

        if (createNewServer) {
            server.insert(config_key::defaultContainer, ContainerProps::containerToString(installedContainers.firstKey()));
            m_settings->addServer(server);
            m_settings->setDefaultServer(m_settings->serversCount() - 1);
            isServerCreated = true;
        }
    }

    return ErrorCode::NoError;
}

bool UiLogic::isContainerAlreadyAddedToGui(DockerContainer container)
{
    for (int i = 0; i < m_settings->serversCount(); i++) {
        const ServerCredentials credentials = m_settings->serverCredentials(i);
        if (m_installCredentials.hostName == credentials.hostName && m_installCredentials.port == credentials.port) {
            const QJsonObject containerConfig = m_settings->containerConfig(i, container);
            if (!containerConfig.isEmpty()) {
                return true;
            }
        }
    }
    return false;
}