#include <QXmlStreamWriter>
#include <QXmlStreamReader>
#include <QXmlStreamAttribute>
#include <QFile>
#include <QThread>
#include <QErrorMessage>

#include "serverlmswidget.h"
#include "dialogsettingstray.h"
#include "specialmessagebox.h"
#include "metatypes.h"
#include "ui_serverlmswidget.h"


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


ServerLMSWidget::ServerLMSWidget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::ServerLMSWidget),
    waitAnimationWidget(nullptr),    
    updateThread(nullptr),
    loggerThread(nullptr),
    serverThread(nullptr),
    server(nullptr),
    dataParser(nullptr),
    processingSystem(nullptr),
    commonClientHandler(nullptr),
    chatSystem(nullptr),
    providerDBLMS(nullptr),
    updateController(nullptr),
    assetsManager(nullptr),
    docsUpdater(nullptr),
    cfiController(nullptr),       
    first(true),
    language(languageENG),
    errorCode(0),
    stateVersionMaterials("..."),
    dbIsConnected(false),
    stateServer(EStateServer::stoped),
    stateBlockAutorization(EStateBlockAutorization::unblocked),
    flStartInitialization(false),
    flTryConnectionToDB(false),
    flNeedReconnectDB(false)
{
    ui->setupUi(this);

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

    ui->widget_Control->setObjectName("widgetControl");
    ui->btnStopServer->setObjectName("btnStopServer");
    ui->btnStartServer->setObjectName("btnStartServer");
    ui->btnSettings->setObjectName("btnSettings");

    registerMetaType();

    updateMyStyleSheet();

    initLanguageInterfase();

    waitAnimationWidget = new WaitAnimationWidget;
    QMovie *movie = new QMovie(":/resources/icons/762.gif");
    waitAnimationWidget->setParent(this);
    waitAnimationWidget->initialize(movie,this);

    updateStateOnlyVersionMaterials();
}

ServerLMSWidget::~ServerLMSWidget()
{
    if(flStartInitialization)
    {
        emit signal_StopServer();
        //server->stopServer();

        updateThread->quit();
        updateThread->wait();
        delete updateThread;

        serverThread->quit();
        serverThread->wait();
        delete serverThread;

        delete server;
        delete commonClientHandler;
        delete dataParser;
        delete processingSystem;
        delete updateController;
        delete cfiController;
        delete docsUpdater;
        delete assetsManager;
        delete chatSystem;

        loggerThread->quit();
        loggerThread->wait();
        delete loggerThread;

        delete providerDBLMS;
    }

    waitAnimationWidget->hideWithStop();
    delete waitAnimationWidget;

    delete ui;
}


//INTERFACE
void ServerLMSWidget::start()
{
    startInitialization_step0();
}


//EVENT

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

        updateStateOnlyServer();
        updateStateOnlyDB();
        updateStateOnlyVersionMaterials();
    }
}

void ServerLMSWidget::resizeEvent(QResizeEvent *event)
{
    QSize size = event->size();
    waitAnimationWidget->resize(size);
}


//STYLESHEET

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))
    {
        SpecMsgBox::WarningClose(this, tr("The file could not be opened ") + fileName);
        return QStringLiteral("");
    }
    else
    {
        QByteArray byteArray = styleSheetFile.readAll();
        styleSheetFile.close();

        QString style = byteArray;
        return style;
    }
}


//LANGUAGE

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

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

    qApp->installTranslator(&qtLanguageTranslator);

    emit signal_LanguageChanged(language);
}


//UPDATE STATES

void ServerLMSWidget::updateStateOnlyServer()
{
    if(stateServer == EStateServer::started)
    {
        if(stateBlockAutorization == EStateBlockAutorization::unblocked)
        {
            ui->lblOnOffText->setText(tr("started"));
            ui->lblOnOff->setPixmap(QPixmap(QStringLiteral(":/resources/icons/circleGreen.png")));
        }
        else
        {
            ui->lblOnOffText->setText(tr("started") + ", " + tr("locked"));
            ui->lblOnOff->setPixmap(QPixmap(QStringLiteral(":/resources/icons/lock.png")));
        }
    }
    else
    {
        ui->lblOnOffText->setText(tr("stoped"));
        ui->lblOnOff->setPixmap(QPixmap(QStringLiteral(":/resources/icons/stoped.png")));
    }

    emit signal_updateStateServer(stateServer, stateBlockAutorization);
}

void ServerLMSWidget::updateStateOnlyDB()
{
    if(dbIsConnected)
    {
        //Настройки БД
        QString strDBsettings = tr("connected") + QString("   [%1 (%2) %3 : %4]").arg(dbSettings.dbName,
                                                               dbSettings.dbType,
                                                               dbSettings.dbHostName,
                                                               QString::number(dbSettings.dbPort));
        ui->lblDBsettings->setText(strDBsettings);
        ui->lblDBisConnected->setPixmap(QPixmap(QStringLiteral(":/resources/icons/circleGreen.png")));
    }
    else
    {
        ui->lblDBsettings->setText(tr("not connected"));
        ui->lblDBisConnected->setPixmap(QPixmap(QStringLiteral(":/resources/icons/circleGray.png")));

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

void ServerLMSWidget::updateStateOnlyVersionMaterials()
{
    ui->lblVersionText->setText(stateVersionMaterials);
}


//SLOTS

void ServerLMSWidget::slot_UpdateListClients(QStringList listFullName)
{
    //Очищаем список
    ui->listWidget_Clients->clear();

    for (const QString clientFullName : listFullName)
    {
        //QString clientFullName = handler->getClient()->getFullName();

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

    int countClients = listFullName.count();
    Logger::instance().log("SERVER: countClients = " + QString::number(countClients));
}

void ServerLMSWidget::slot_AddMessageToLog(QString message)
{
    ui->loggerTextField->appendHtml(message);
}

void ServerLMSWidget::slot_ErrorPostgreSQL(QString text)
{
    emit signal_Menu_ShowWindow();
    SpecMsgBox::CriticalClose(this, tr("Error PostgreSQL!") + "\n" + text);
}

void ServerLMSWidget::slot_StateConnectionToDB(bool dbIsConnected, DataBaseSettings dbSettings)
{
    this->dbIsConnected = dbIsConnected;
    this->dbSettings = dbSettings;
    updateStateOnlyDB();
}

void ServerLMSWidget::slot_StateServer(EStateServer stateServer, EStateBlockAutorization stateBlockAutorization)
{
    if(this->stateServer != stateServer)
    {
        if(stateServer == EStateServer::started)
        {
            ui->btnStartServer->setEnabled(false);
            ui->btnStopServer->setEnabled(true);
            emit signal_Tray_ShowMessage(tr("Server is started!"));
        }
        else
        {
            ui->btnStopServer->setEnabled(false);
            ui->btnStartServer->setEnabled(true);
            emit signal_Tray_ShowMessage(tr("Server is stoped!"));
        }
    }
    this->stateServer = stateServer;
    this->stateBlockAutorization = stateBlockAutorization;
    updateStateOnlyServer();
}

void ServerLMSWidget::slot_StateVersionMaterials(QString versionStr)
{
    this->stateVersionMaterials = versionStr;
    updateStateOnlyVersionMaterials();
}

void ServerLMSWidget::slot_ResultTryConnectDb(bool result)
{
    if(flTryConnectionToDB)
    {
        flTryConnectionToDB = false;

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

            Logger::instance().log("Connection to DB completed!");

            emit signal_Tray_ShowMessage(tr("Database connection OK!") + "\n" + strDBsettings);

            on_btnStartServer_clicked();
        }
        else
        {
            Logger::instance().log("Database connection error!");

            emit signal_Tray_ShowMessage(tr("Database connection error!"), QSystemTrayIcon::Critical);

            emit signal_Menu_ShowWindow();

            SpecMsgBox::CriticalClose(this, tr("Database connection error!"));

            on_btnSettings_clicked();
        }
    }
}

void ServerLMSWidget::slot_ResultTryDisConnectDb(bool result)
{
    if(flNeedReconnectDB)
    {
        flNeedReconnectDB = false;

        SpecMsgBox::WarningClose(this, tr("Database settings have been changed.\nThe server will be restarted."));

        tryConnectionToDB();
    }
}


void ServerLMSWidget::slot_UpdateDocs()
{
    emit signal_updateDocsXML();
}

void ServerLMSWidget::slot_UpdateControllerInitializeFinished()
{
    startInitialization_step1();
}


void ServerLMSWidget::slot_BlockAutorizationIndicate(bool block, QString blocker, QString types)
{
    if(block)
    {
        //server->blockAutorization();
        Logger::instance().log(QString("BLOCK from: %1").arg(blocker), LogLevel::INFO);
        //if(type != "")
            Logger::instance().log(QString("Blockers: %1").arg(types), LogLevel::DEBUG);
    }
    else
    {
        //server->unBlockAutorization();
        Logger::instance().log(QString("UNBLOCK from: %1").arg(blocker), LogLevel::INFO);
        //if(type != "")
            Logger::instance().log(QString("Blockers: %1").arg(types), LogLevel::DEBUG);
    }
    updateStateOnlyServer();
}

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

    emit signal_LanguageChanged(language);
}


//ON_BTN

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

        ui->btnStartServer->setEnabled(false);
        ui->btnStopServer->setEnabled(true);
        //slot_BlockAutorizationIndicate(false, "SERVER");

        //updateStateOnlyServer();

        //emit signal_Tray_ShowMessage(tr("Server is started!"));

        //QApplication::restoreOverrideCursor();
    }
}

void ServerLMSWidget::on_btnStopServer_clicked()
{
    emit signal_StopServer();
    //if(server->stopServer())
    {
        //QApplication::setOverrideCursor(Qt::WaitCursor);

        ui->btnStopServer->setEnabled(false);
        ui->btnStartServer->setEnabled(true);
        //slot_BlockAutorizationIndicate(true, "SERVER");

        //updateStateOnlyServer();

        //emit signal_Tray_ShowMessage(tr("Server is stoped!"));

        //QApplication::restoreOverrideCursor();
    }
}

void ServerLMSWidget::on_btnSettings_clicked()
{
    ServerDBSettings settingsTemp;
    if(!DialogSettingsTray::loadSettings(&settingsTemp))
    {
        SpecMsgBox::CriticalClose(this, tr("Settings file could not be opened:") + "'config/settings.xml'");
        return;
    }

    DialogSettingsTray dlg(providerDBLMS, this);
    dlg.setWindowFlags(dlg.windowFlags() & ~Qt::WindowContextHelpButtonHint);

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

    connect(&dlg, &DialogSettingsTray::signal_UpdateDocs, this, &ServerLMSWidget::slot_UpdateDocs);


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

        if(dlg.settingsDBisChanged())
        {
            on_btnStopServer_clicked();

            //providerDBLMS->deAuthorizationAll();

            //providerDBLMS->DisConnectionFromDB();

            flNeedReconnectDB = true;
            flTryConnectionToDB = false;

            emit signal_TryDisConnectionFromDB();

            //updateStateOnlyDB();

            break;
        }

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


//INIT

void ServerLMSWidget::startInitialization_step0()
{
    emit signal_Tray_ShowMessage(tr("Starting the server..."));

    waitAnimationWidget->showWithPlay();    

    updateThread = new QThread;
    loggerThread = new QThread;
    serverThread = new QThread;

    providerDBLMS = new ProviderDBLMS();
    providerDBLMS->moveToThread(serverThread);

    connect(providerDBLMS, &ProviderDBLMS::signal_ErrorPostgreSQL, this, &ServerLMSWidget::slot_ErrorPostgreSQL);
    connect(providerDBLMS, &ProviderDBLMS::signal_StateConnectionToDB, this, &ServerLMSWidget::slot_StateConnectionToDB);
    connect(this, &ServerLMSWidget::signal_TryConnectionToDB, providerDBLMS, &ProviderDBLMS::slot_TryConnectionToDB);
    connect(this, &ServerLMSWidget::signal_TryDisConnectionFromDB, providerDBLMS, &ProviderDBLMS::slot_TryDisConnectionFromDB);
    connect(providerDBLMS, &ProviderDBLMS::signal_ResultTryConnectDb, this, &ServerLMSWidget::slot_ResultTryConnectDb);
    connect(providerDBLMS, &ProviderDBLMS::signal_ResultTryDisConnectDb, this, &ServerLMSWidget::slot_ResultTryDisConnectDb);

    chatSystem = new ChatSystem();
    chatSystem->moveToThread(serverThread);

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

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

    docsUpdater = new DocsUpdater(updateController/*, this*/);
    docsUpdater->moveToThread(updateThread);

    cfiController = new CfiController(updateController/*, this*/);
    cfiController->moveToThread(updateThread);

    processingSystem = new ProcessingSystem(providerDBLMS, updateController, docsUpdater, cfiController);
    processingSystem->moveToThread(serverThread);

    dataParser = new DataParser(assetsManager, processingSystem);
    dataParser->moveToThread(serverThread);

    commonClientHandler = new CommonClientHandler;
    commonClientHandler->moveToThread(serverThread);

    connect(docsUpdater, &DocsUpdater::signal_DocsChanged, commonClientHandler, &CommonClientHandler::slot_DocsChanged);

    server = new MultiThreadServer(updateController, docsUpdater, processingSystem, dataParser, 6000);
    server->moveToThread(serverThread);

    connect(server, &MultiThreadServer::signal_StateServer, this, &ServerLMSWidget::slot_StateServer);
    connect(server, &MultiThreadServer::signal_UpdateListClients, this, &ServerLMSWidget::slot_UpdateListClients);

    connect(this, &ServerLMSWidget::signal_StartServer, server, &MultiThreadServer::slot_StartServer);
    connect(this, &ServerLMSWidget::signal_StopServer, server, &MultiThreadServer::slot_StopServer);

    connect(server, &MultiThreadServer::signal_BlockAutorizationIndicate, this, &ServerLMSWidget::slot_BlockAutorizationIndicate);
    connect(providerDBLMS, &ProviderDBLMS::signal_BlockAutorization, server, &MultiThreadServer::slot_BlockAutorization, Qt::DirectConnection /*Тут именно DirectConnection!*/);
    connect(updateController, &UpdateController::signal_BlockAutorization, server, &MultiThreadServer::slot_BlockAutorization/*, Qt::DirectConnection*/);
    connect(server, &MultiThreadServer::signal_sendPacketToAllClients, commonClientHandler, &CommonClientHandler::slot_sendPacketToAllClients);

    loggerThread->start();
    updateThread->start();
    serverThread->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::sigUpdateControllerInitialize, updateController, &UpdateController::initialize);
    connect(updateController, &UpdateController::sigInitializeFinished, this, &ServerLMSWidget::slot_UpdateControllerInitializeFinished);
    connect(this, &ServerLMSWidget::sigCalculateFullHash, updateController, &UpdateController::calculateFullHash, Qt::AutoConnection);
    connect(updateController, &UpdateController::sigErrorRequired, this, &ServerLMSWidget::setError);
    connect(updateController, &UpdateController::sigUpdateDocs, this, &ServerLMSWidget::slot_UpdateDocs, Qt::AutoConnection);
    connect(&Logger::instance(), &Logger::sigLogToWidget, this, &ServerLMSWidget::slot_AddMessageToLog, Qt::QueuedConnection);

    connect(assetsManager, &AssetsManager::signal_setVersion, this, &ServerLMSWidget::slot_StateVersionMaterials);

    connect(this, &ServerLMSWidget::signal_updateDocsXML, docsUpdater, &DocsUpdater::slot_updateDocsXML);

    emit sigUpdateControllerInitialize(commonClientHandler, dataParser, assetsManager);
}

void ServerLMSWidget::startInitialization_step1()
{
    Logger::instance().log("Update docs.xml...");
    slot_UpdateDocs();
    Logger::instance().log("Update docs.xml completed!");

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

    flStartInitialization = true;

    updateStateOnlyServer();
    updateStateOnlyDB();
    updateStateOnlyVersionMaterials();

    //QApplication::restoreOverrideCursor();

    if(hasError() == 100)
        return;

    Logger::instance().log("Try connection to DB...");
    tryConnectionToDB();

    waitAnimationWidget->hideWithStop();

    emit signal_InitializeFinished();
}


//CONNECT DB

void ServerLMSWidget::tryConnectionToDB()
{
    flTryConnectionToDB = true;
    flNeedReconnectDB = false;
    emit signal_TryConnectionToDB();
    return;
}