#include <QXmlStreamWriter>
#include <QXmlStreamReader>
#include <QXmlStreamAttribute>
#include <QFile>
#include <QMessageBox>
#include <QThread>
#include <QErrorMessage>
#include "serverlmswidget.h"
#include "dialogsettingstray.h"
#include "ui_serverlmswidget.h"
#include "metatypes.h"

const QString ServerLMSWidget::languageENG = "en_EN";
const QString ServerLMSWidget::languageRUS = "ru_RU";

ServerLMSWidget::ServerLMSWidget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::ServerLMSWidget),
    server(nullptr),
    updateThread(nullptr),
    loggerThread(nullptr),
    mutex(nullptr),
    dataParser(nullptr),
    processingSystem(nullptr),
    updateController(nullptr),
    assetsManager(nullptr),
    commonClientHandler(nullptr),
    chatSystem(nullptr),
    providerDBLMS(nullptr),
    first (true),
    language(languageENG),
    errorCode(0)
{
    ui->setupUi(this);

    qDebug() << "ServerLMSWidget init thread ID " << QThread::currentThreadId();

    registerMetaType();

    updateMyStyleSheet();

    setLanguageInterfase();

    mutex = new QMutex;

    ui->btnStopServer->setEnabled(false);
    ui->btnStartServer->setEnabled(true);

    updateThread = new QThread;
    loggerThread = new QThread;

    providerDBLMS = new ProviderDBLMS(this);
    providerDBLMS->ConnectionToDB();
    providerDBLMS->deAuthorizationAll();

    //Настройки БД
    DataBaseSettings dbSettings = providerDBLMS->getDBSettings();
    QString strDBsettings = QString("%1 (%2) %3 : %4").arg(dbSettings.dbName,
                                                           dbSettings.dbType,
                                                           dbSettings.dbHostName,
                                                           QString::number(dbSettings.dbPort));
    ui->lblDBsettings->setText(strDBsettings);

    chatSystem = new ChatSystem();

    connect(providerDBLMS, &ProviderDBLMS::signal_BlockAutorization, this, &ServerLMSWidget::slot_BlockAutorization);

    assetsManager = new AssetsManager;
    assetsManager->moveToThread(updateThread);

    updateController = new UpdateController;
    updateController->moveToThread(updateThread);

    processingSystem = new ProcessingSystem(providerDBLMS, updateController);
    //processingSystem->moveToThread(updateThread);

    dataParser = new DataParser(assetsManager,processingSystem);

    commonClientHandler = new CommonClientHandler;
    server = new MultiThreadServer(this,updateController,processingSystem,dataParser,6000);

    loggerThread->start();
    updateThread->start();

    commonClientHandler->initialize(server->getClientsMap(),processingSystem,dataParser);
    processingSystem->initialize(server,dataParser,commonClientHandler,updateController,chatSystem);
    chatSystem->initialize(commonClientHandler,dataParser,server->getClientsMap());

    Logger::instance().moveToThread(loggerThread);
    Logger::instance().setLoggingType(LoggingType::WIDGET);
    Logger::instance().setLogToFile(true);

    connect(this,&ServerLMSWidget::sigUpdateController,updateController,&UpdateController::initialize,Qt::DirectConnection);
    connect(this,&ServerLMSWidget::sigCalculateFullHash,updateController,&UpdateController::calculateFullHash,Qt::AutoConnection);
    connect(updateController,&UpdateController::sigErrorRequired,this,&ServerLMSWidget::setError);
    connect(&Logger::instance(),&Logger::sigLogToWidget,this, &ServerLMSWidget::addToLog,Qt::QueuedConnection);

    emit sigUpdateController(commonClientHandler,dataParser,assetsManager);
    on_btnStartServer_clicked();    
}

ServerLMSWidget::~ServerLMSWidget()
{
    server->stopServer();
    updateThread->exit();
    loggerThread->exit();

    delete server;
    delete commonClientHandler;
    delete dataParser;
    delete processingSystem;
    delete updateController;
    delete assetsManager;
    delete chatSystem;
    delete providerDBLMS;
    delete loggerThread;
    delete updateThread;
    delete mutex;

    delete ui;
}

void ServerLMSWidget::setError(int code)
{
    errorCode = code;
}

QString ServerLMSWidget::getLanguage()
{
    return language;
}

void ServerLMSWidget::slotUpdateListClients()
{
    //Очищаем список
    ui->listWidget_Clients->clear();

    for (const ClientHandler *handler : server->getClientsMap()->values())
    {
        QString strClient = handler->getClient()->getFullName();

        ui->listWidget_Clients->addItem(strClient);
        ui->listWidget_Clients->scrollToBottom();
        ui->listWidget_Clients->setCurrentRow(ui->listWidget_Clients->count() - 1);
    }

    int countClients = (*server->getClientsMap()).count();
    Logger::instance().log("SERVER: countClients = " + QString::number(countClients));
}

void ServerLMSWidget::addToLog(QString message)
{
    ui->loggerTextField->appendPlainText(message);
}

void ServerLMSWidget::slot_BlockAutorization(bool block)
{
    if(block)
    {
        server->blockAutorization();
        ui->lblBlockAuth->setPixmap(QPixmap(QStringLiteral(":/resources/icons/lock.png")));
    }
    else
    {
        server->unBlockAutorization();
        ui->lblBlockAuth->setPixmap(QPixmap(QStringLiteral(":/resources/icons/open.png")));
    }
}

void ServerLMSWidget::slot_LanguageChanged(QString language)
{
    qtLanguageTranslator.load(QString("translations/ServerLMS_") + language, ".");
    qApp->installTranslator(&qtLanguageTranslator);

    emit signal_LanguageChanged(language);
}

void ServerLMSWidget::on_btnStartServer_clicked()
{
    if(server->startServer())
    {
        QApplication::setOverrideCursor(Qt::WaitCursor);
        QApplication::restoreOverrideCursor();

        ui->btnStartServer->setEnabled(false);
        ui->btnStopServer->setEnabled(true);
        ui->lblOnOff->setPixmap(QPixmap(QStringLiteral(":/resources/icons/switchOn.png")));
    }
}

void ServerLMSWidget::on_btnStopServer_clicked()
{
    if(server->stopServer())
    {
        ui->btnStopServer->setEnabled(false);
        ui->btnStartServer->setEnabled(true);
        ui->lblOnOff->setPixmap(QPixmap(QStringLiteral(":/resources/icons/switchOff.png")));
        slot_BlockAutorization(false);
    }
}

QMutex *ServerLMSWidget::getMutex() const
{
    return mutex;
}

void ServerLMSWidget::changeEvent(QEvent *event)
{
    // В случае получения события изменения языка приложения
    if (event->type() == QEvent::LanguageChange)
    {
        ui->retranslateUi(this);    // переведём окно заново

        //Настройки БД
        DataBaseSettings dbSettings = providerDBLMS->getDBSettings();
        QString strDBsettings = QString("%1 (%2) %3 : %4").arg(dbSettings.dbName,
                                                               dbSettings.dbType,
                                                               dbSettings.dbHostName,
                                                               QString::number(dbSettings.dbPort));
        ui->lblDBsettings->setText(strDBsettings);
    }
}

void ServerLMSWidget::on_btnSettings_clicked()
{
    DialogSettingsTray dlg(this);
    dlg.setWindowFlags(dlg.windowFlags() & ~Qt::WindowContextHelpButtonHint);

    connect(&dlg, &DialogSettingsTray::signal_LanguageChanged, this, &ServerLMSWidget::slot_LanguageChanged);
    //connect(&dlg, &DialogSettingsTray::signal_UpdateStyleSheet, this, &InstructorsAndTraineesWidget::slot_UpdateStyleSheet);


    switch( dlg.exec() )
    {
    case QDialog::Accepted:
    {
        language = dlg.getSettings().Language;

        if(dlg.settingsServerIsChanged())
        {//TODO Здесь нужно переподключать БД

            //SpecialMessageBox(this, SpecialMessageBox::TypeSpecMsgBox::warningClose, tr("Server settings have been changed. Please reconnect to the server.")).exec();

            providerDBLMS->deAuthorizationAll();

            on_btnStopServer_clicked();

            providerDBLMS->DisConnectionFromDB();

            providerDBLMS->ConnectionToDB();

            //on_btnStartServer_clicked();
        }

        break;
    }
    case QDialog::Rejected:
        break;
    default:
        break;
    }
}

void ServerLMSWidget::setLanguageInterfase()
{
    ServerDBSettings settings;
    DialogSettingsTray::loadSettings(&settings);

    if(settings.Language == "ENG")
    {
        qtLanguageTranslator.load(QString("translations/ServerLMS_") + languageENG, ".");
        language = languageENG;
    }
    else
    {
        qtLanguageTranslator.load(QString("translations/ServerLMS_") + languageRUS, ".");
        language = languageRUS;
    }

    qApp->installTranslator(&qtLanguageTranslator);

    emit signal_LanguageChanged(language);
}

void ServerLMSWidget::updateMyStyleSheet()
{
    QString styleSheet = loadStyleSheet();
    styleSheet = styleSheet.replace("\n", "");

    this->setStyleSheet(styleSheet);
}

QString ServerLMSWidget::loadStyleSheet()
{
    QString fileName = "./resources/css/styleSheetMain.css";
    QFile styleSheetFile(fileName);
    if (!styleSheetFile.open(QFile::ReadOnly | QFile::Text))
    {
        QMessageBox::warning(this, tr("Warning!"), tr("The file could not be opened ") + fileName);
        return QStringLiteral("");
    }
    else
    {
        QByteArray byteArray = styleSheetFile.readAll();
        styleSheetFile.close();

        QString style = byteArray;
        return style;
    }
}