// SPDX-License-Identifier: GPL-3.0-only
/*
 *  PolyMC - Minecraft Launcher
 *  Copyright (C) 2022 Sefa Eyeoglu <contact@scrumplex.net>
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, version 3.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 *      Copyright 2013-2021 MultiMC Contributors
 *
 *      Licensed under the Apache License, Version 2.0 (the "License");
 *      you may not use this file except in compliance with the License.
 *      You may obtain a copy of the License at
 *
 *          http://www.apache.org/licenses/LICENSE-2.0
 *
 *      Unless required by applicable law or agreed to in writing, software
 *      distributed under the License is distributed on an "AS IS" BASIS,
 *      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *      See the License for the specific language governing permissions and
 *      limitations under the License.
 */

#include "Application.h"
#include "BuildConfig.h"

#include "ui/MainWindow.h"
#include "ui/InstanceWindow.h"

#include "ui/instanceview/AccessibleInstanceView.h"

#include "ui/pages/BasePageProvider.h"
#include "ui/pages/global/LauncherPage.h"
#include "ui/pages/global/MinecraftPage.h"
#include "ui/pages/global/JavaPage.h"
#include "ui/pages/global/LanguagePage.h"
#include "ui/pages/global/ProxyPage.h"
#include "ui/pages/global/ExternalToolsPage.h"
#include "ui/pages/global/AccountListPage.h"
#include "ui/pages/global/APIPage.h"
#include "ui/pages/global/CustomCommandsPage.h"

#include "ui/themes/ITheme.h"
#include "ui/themes/SystemTheme.h"
#include "ui/themes/DarkTheme.h"
#include "ui/themes/BrightTheme.h"
#include "ui/themes/CustomTheme.h"

#include "ui/setupwizard/SetupWizard.h"
#include "ui/setupwizard/LanguageWizardPage.h"
#include "ui/setupwizard/JavaWizardPage.h"

#include "ui/dialogs/CustomMessageBox.h"

#include "ui/pagedialog/PageDialog.h"

#include "ApplicationMessage.h"

#include <iostream>

#include <QAccessible>
#include <QDir>
#include <QFileInfo>
#include <QNetworkAccessManager>
#include <QTranslator>
#include <QLibraryInfo>
#include <QList>
#include <QStringList>
#include <QDebug>
#include <QStyleFactory>
#include <QWindow>

#include "InstanceList.h"

#include <minecraft/auth/AccountList.h>
#include "icons/IconList.h"
#include "net/HttpMetaCache.h"

#include "java/JavaUtils.h"

#include "updater/UpdateChecker.h"

#include "tools/JProfiler.h"
#include "tools/JVisualVM.h"
#include "tools/MCEditTool.h"

#include <xdgicon.h>
#include "settings/INISettingsObject.h"
#include "settings/Setting.h"

#include "translations/TranslationsModel.h"
#include "meta/Index.h"

#include <Commandline.h>
#include <FileSystem.h>
#include <DesktopServices.h>
#include <LocalPeer.h>

#include <sys.h>


#if defined Q_OS_WIN32
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#include <stdio.h>
#endif

#define STRINGIFY(x) #x
#define TOSTRING(x) STRINGIFY(x)

static const QLatin1String liveCheckFile("live.check");

using namespace Commandline;

#define MACOS_HINT "If you are on macOS Sierra, you might have to move the app to your /Applications or ~/Applications folder. "\
    "This usually fixes the problem and you can move the application elsewhere afterwards.\n"\
    "\n"

namespace {
void appDebugOutput(QtMsgType type, const QMessageLogContext &context, const QString &msg)
{
    const char *levels = "DWCFIS";
    const QString format("%1 %2 %3\n");

    qint64 msecstotal = APPLICATION->timeSinceStart();
    qint64 seconds = msecstotal / 1000;
    qint64 msecs = msecstotal % 1000;
    QString foo;
    char buf[1025] = {0};
    ::snprintf(buf, 1024, "%5lld.%03lld", seconds, msecs);

    QString out = format.arg(buf).arg(levels[type]).arg(msg);

    APPLICATION->logFile->write(out.toUtf8());
    APPLICATION->logFile->flush();
    QTextStream(stderr) << out.toLocal8Bit();
    fflush(stderr);
}

QString getIdealPlatform(QString currentPlatform) {
    auto info = Sys::getKernelInfo();
    switch(info.kernelType) {
        case Sys::KernelType::Darwin: {
            if(info.kernelMajor >= 17) {
                // macOS 10.13 or newer
                return "osx64-5.15.2";
            }
            else {
                // macOS 10.12 or older
                return "osx64";
            }
        }
        case Sys::KernelType::Windows: {
            // FIXME: 5.15.2 is not stable on Windows, due to a large number of completely unpredictable and hard to reproduce issues
            break;
/*
            if(info.kernelMajor == 6 && info.kernelMinor >= 1) {
                // Windows 7
                return "win32-5.15.2";
            }
            else if (info.kernelMajor > 6) {
                // Above Windows 7
                return "win32-5.15.2";
            }
            else {
                // Below Windows 7
                return "win32";
            }
*/
        }
        case Sys::KernelType::Undetermined:
        case Sys::KernelType::Linux: {
            break;
        }
    }
    return currentPlatform;
}

}

Application::Application(int &argc, char **argv) : QApplication(argc, argv)
{
#if defined Q_OS_WIN32
    // attach the parent console
    if(AttachConsole(ATTACH_PARENT_PROCESS))
    {
        // if attach succeeds, reopen and sync all the i/o
        if(freopen("CON", "w", stdout))
        {
            std::cout.sync_with_stdio();
        }
        if(freopen("CON", "w", stderr))
        {
            std::cerr.sync_with_stdio();
        }
        if(freopen("CON", "r", stdin))
        {
            std::cin.sync_with_stdio();
        }
        auto out = GetStdHandle (STD_OUTPUT_HANDLE);
        DWORD written;
        const char * endline = "\n";
        WriteConsole(out, endline, strlen(endline), &written, NULL);
        consoleAttached = true;
    }
#endif
    setOrganizationName(BuildConfig.LAUNCHER_NAME);
    setOrganizationDomain(BuildConfig.LAUNCHER_DOMAIN);
    setApplicationName(BuildConfig.LAUNCHER_NAME);
    setApplicationDisplayName(BuildConfig.LAUNCHER_DISPLAYNAME);
    setApplicationVersion(BuildConfig.printableVersionString());
    setDesktopFileName(BuildConfig.LAUNCHER_DESKTOPFILENAME);
    startTime = QDateTime::currentDateTime();

    // Don't quit on hiding the last window
    this->setQuitOnLastWindowClosed(false);

    // Commandline parsing
    QHash<QString, QVariant> args;
    {
        Parser parser(FlagStyle::GNU, ArgumentStyle::SpaceAndEquals);

        // --help
        parser.addSwitch("help");
        parser.addShortOpt("help", 'h');
        parser.addDocumentation("help", "Display this help and exit.");
        // --version
        parser.addSwitch("version");
        parser.addShortOpt("version", 'V');
        parser.addDocumentation("version", "Display program version and exit.");
        // --dir
        parser.addOption("dir");
        parser.addShortOpt("dir", 'd');
        parser.addDocumentation("dir", "Use the supplied folder as application root instead of the binary location (use '.' for current)");
        // --launch
        parser.addOption("launch");
        parser.addShortOpt("launch", 'l');
        parser.addDocumentation("launch", "Launch the specified instance (by instance ID)");
        // --server
        parser.addOption("server");
        parser.addShortOpt("server", 's');
        parser.addDocumentation("server", "Join the specified server on launch (only valid in combination with --launch)");
        // --profile
        parser.addOption("profile");
        parser.addShortOpt("profile", 'a');
        parser.addDocumentation("profile", "Use the account specified by its profile name (only valid in combination with --launch)");
        // --alive
        parser.addSwitch("alive");
        parser.addDocumentation("alive", "Write a small '" + liveCheckFile + "' file after the launcher starts");
        // --import
        parser.addOption("import");
        parser.addShortOpt("import", 'I');
        parser.addDocumentation("import", "Import instance from specified zip (local path or URL)");

        // parse the arguments
        try
        {
            args = parser.parse(arguments());
        }
        catch (const ParsingError &e)
        {
            std::cerr << "CommandLineError: " << e.what() << std::endl;
            if(argc > 0)
                std::cerr << "Try '" << argv[0] << " -h' to get help on command line parameters."
                          << std::endl;
            m_status = Application::Failed;
            return;
        }

        // display help and exit
        if (args["help"].toBool())
        {
            std::cout << qPrintable(parser.compileHelp(arguments()[0]));
            m_status = Application::Succeeded;
            return;
        }

        // display version and exit
        if (args["version"].toBool())
        {
            std::cout << "Version " << BuildConfig.printableVersionString().toStdString() << std::endl;
            std::cout << "Git " << BuildConfig.GIT_COMMIT.toStdString() << std::endl;
            m_status = Application::Succeeded;
            return;
        }
    }

    m_instanceIdToLaunch = args["launch"].toString();
    m_serverToJoin = args["server"].toString();
    m_profileToUse = args["profile"].toString();
    m_liveCheck = args["alive"].toBool();
    m_zipToImport = args["import"].toUrl();

    // error if --launch is missing with --server or --profile
    if((!m_serverToJoin.isEmpty() || !m_profileToUse.isEmpty()) && m_instanceIdToLaunch.isEmpty())
    {
        std::cerr << "--server and --profile can only be used in combination with --launch!" << std::endl;
        m_status = Application::Failed;
        return;
    }

    QString origcwdPath = QDir::currentPath();
    QString binPath = applicationDirPath();

    {
        // Root path is used for updates and portable data
#if defined(Q_OS_LINUX) || defined(Q_OS_FREEBSD)
        QDir foo(FS::PathCombine(binPath, "..")); // typically portable-root or /usr
        m_rootPath = foo.absolutePath();
#elif defined(Q_OS_WIN32)
        m_rootPath = binPath;
#elif defined(Q_OS_MAC)
        QDir foo(FS::PathCombine(binPath, "../.."));
        m_rootPath = foo.absolutePath();
        // on macOS, touch the root to force Finder to reload the .app metadata (and fix any icon change issues)
        FS::updateTimestamp(m_rootPath);
#endif

#ifdef LAUNCHER_JARS_LOCATION
        m_jarsPath = TOSTRING(LAUNCHER_JARS_LOCATION);
#endif
    }

    QString adjustedBy;
    QString dataPath;
    // change folder
    QString dirParam = args["dir"].toString();
    if (!dirParam.isEmpty())
    {
        // the dir param. it makes multimc data path point to whatever the user specified
        // on command line
        adjustedBy = "Command line";
        dataPath = dirParam;
    }
    else
    {
        QDir foo(FS::PathCombine(QStandardPaths::writableLocation(QStandardPaths::AppDataLocation), ".."));
        dataPath = foo.absolutePath();
        adjustedBy = "Persistent data path";

#ifdef Q_OS_LINUX
        // TODO: this should be removed in a future version
        // TODO: provide a migration path similar to macOS migration
        QDir bar(FS::PathCombine(QStandardPaths::writableLocation(QStandardPaths::GenericDataLocation), "polymc"));
        if (bar.exists()) {
            dataPath = bar.absolutePath();
            adjustedBy = "Legacy data path";
        }
#endif

#ifndef Q_OS_MACOS
        if (QFile::exists(FS::PathCombine(m_rootPath, "portable.txt"))) {
            dataPath = m_rootPath;
            adjustedBy = "Portable data path";
        }
#endif
    }

    if (!FS::ensureFolderPathExists(dataPath))
    {
        showFatalErrorMessage(
            "The launcher data folder could not be created.",
            QString(
                "The launcher data folder could not be created.\n"
                "\n"
#if defined(Q_OS_MAC)
                MACOS_HINT
#endif
                "Make sure you have the right permissions to the launcher data folder and any folder needed to access it.\n"
                "(%1)\n"
                "\n"
                "The launcher cannot continue until you fix this problem."
            ).arg(dataPath)
        );
        return;
    }
    if (!QDir::setCurrent(dataPath))
    {
        showFatalErrorMessage(
            "The launcher data folder could not be opened.",
            QString(
                "The launcher data folder could not be opened.\n"
                "\n"
#if defined(Q_OS_MAC)
                MACOS_HINT
#endif
                "Make sure you have the right permissions to the launcher data folder.\n"
                "(%1)\n"
                "\n"
                "The launcher cannot continue until you fix this problem."
            ).arg(dataPath)
        );
        return;
    }

    /*
     * Establish the mechanism for communication with an already running PolyMC that uses the same data path.
     * If there is one, tell it what the user actually wanted to do and exit.
     * We want to initialize this before logging to avoid messing with the log of a potential already running copy.
     */
    auto appID = ApplicationId::fromPathAndVersion(QDir::currentPath(), BuildConfig.printableVersionString());
    {
        // FIXME: you can run the same binaries with multiple data dirs and they won't clash. This could cause issues for updates.
        m_peerInstance = new LocalPeer(this, appID);
        connect(m_peerInstance, &LocalPeer::messageReceived, this, &Application::messageReceived);
        if(m_peerInstance->isClient()) {
            int timeout = 2000;

            if(m_instanceIdToLaunch.isEmpty())
            {
                ApplicationMessage activate;
                activate.command = "activate";
                m_peerInstance->sendMessage(activate.serialize(), timeout);

                if(!m_zipToImport.isEmpty())
                {
                    ApplicationMessage import;
                    import.command = "import";
                    import.args.insert("path", m_zipToImport.toString());
                    m_peerInstance->sendMessage(import.serialize(), timeout);
                }
            }
            else
            {
                ApplicationMessage launch;
                launch.command = "launch";
                launch.args["id"] = m_instanceIdToLaunch;

                if(!m_serverToJoin.isEmpty())
                {
                    launch.args["server"] = m_serverToJoin;
                }
                if(!m_profileToUse.isEmpty())
                {
                    launch.args["profile"] = m_profileToUse;
                }
                m_peerInstance->sendMessage(launch.serialize(), timeout);
            }
            m_status = Application::Succeeded;
            return;
        }
    }

    // init the logger
    {
        static const QString logBase = BuildConfig.LAUNCHER_NAME + "-%0.log";
        auto moveFile = [](const QString &oldName, const QString &newName)
        {
            QFile::remove(newName);
            QFile::copy(oldName, newName);
            QFile::remove(oldName);
        };

        moveFile(logBase.arg(3), logBase.arg(4));
        moveFile(logBase.arg(2), logBase.arg(3));
        moveFile(logBase.arg(1), logBase.arg(2));
        moveFile(logBase.arg(0), logBase.arg(1));

        logFile = std::unique_ptr<QFile>(new QFile(logBase.arg(0)));
        if(!logFile->open(QIODevice::WriteOnly | QIODevice::Text | QIODevice::Truncate))
        {
            showFatalErrorMessage(
                "The launcher data folder is not writable!",
                QString(
                    "The launcher couldn't create a log file - the data folder is not writable.\n"
                    "\n"
    #if defined(Q_OS_MAC)
                    MACOS_HINT
    #endif
                    "Make sure you have write permissions to the data folder.\n"
                    "(%1)\n"
                    "\n"
                    "The launcher cannot continue until you fix this problem."
                ).arg(dataPath)
            );
            return;
        }
        qInstallMessageHandler(appDebugOutput);
        qDebug() << "<> Log initialized.";
    }

    {

        qDebug() << BuildConfig.LAUNCHER_DISPLAYNAME << ", (c) 2013-2021 " << BuildConfig.LAUNCHER_COPYRIGHT;
        qDebug() << "Version                    : " << BuildConfig.printableVersionString();
        qDebug() << "Git commit                 : " << BuildConfig.GIT_COMMIT;
        qDebug() << "Git refspec                : " << BuildConfig.GIT_REFSPEC;
        if (adjustedBy.size())
        {
            qDebug() << "Work dir before adjustment : " << origcwdPath;
            qDebug() << "Work dir after adjustment  : " << QDir::currentPath();
            qDebug() << "Adjusted by                : " << adjustedBy;
        }
        else
        {
            qDebug() << "Work dir                   : " << QDir::currentPath();
        }
        qDebug() << "Binary path                : " << binPath;
        qDebug() << "Application root path      : " << m_rootPath;
        if(!m_instanceIdToLaunch.isEmpty())
        {
            qDebug() << "ID of instance to launch   : " << m_instanceIdToLaunch;
        }
        if(!m_serverToJoin.isEmpty())
        {
            qDebug() << "Address of server to join  :" << m_serverToJoin;
        }
        qDebug() << "<> Paths set.";
    }

    if(m_liveCheck)
    {
        QFile check(liveCheckFile);
        if(check.open(QIODevice::WriteOnly | QIODevice::Truncate))
        {
            auto payload = appID.toString().toUtf8();
            if(check.write(payload) == payload.size())
            {
                check.close();
            } else {
                qWarning() << "Could not write into" << liveCheckFile << "!";
                check.remove();  // also closes file!
            }
        } else {
            qWarning() << "Could not open" << liveCheckFile << "for writing!";
        }
    }

    // Initialize application settings
    {
        m_settings.reset(new INISettingsObject(BuildConfig.LAUNCHER_CONFIGFILE, this));
        // Updates
        m_settings->registerSetting("UpdateChannel", BuildConfig.VERSION_CHANNEL);
        m_settings->registerSetting("AutoUpdate", true);

        // Theming
        m_settings->registerSetting("IconTheme", QString("pe_colored"));
        m_settings->registerSetting("ApplicationTheme", QString("system"));

        // Remembered state
        m_settings->registerSetting("LastUsedGroupForNewInstance", QString());

        m_settings->registerSetting("MenuBarInsteadOfToolBar", false);

        QString defaultMonospace;
        int defaultSize = 11;
#ifdef Q_OS_WIN32
        defaultMonospace = "Courier";
        defaultSize = 10;
#elif defined(Q_OS_MAC)
        defaultMonospace = "Menlo";
#else
        defaultMonospace = "Monospace";
#endif

        // resolve the font so the default actually matches
        QFont consoleFont;
        consoleFont.setFamily(defaultMonospace);
        consoleFont.setStyleHint(QFont::Monospace);
        consoleFont.setFixedPitch(true);
        QFontInfo consoleFontInfo(consoleFont);
        QString resolvedDefaultMonospace = consoleFontInfo.family();
        QFont resolvedFont(resolvedDefaultMonospace);
        qDebug() << "Detected default console font:" << resolvedDefaultMonospace
            << ", substitutions:" << resolvedFont.substitutions().join(',');

        m_settings->registerSetting("ConsoleFont", resolvedDefaultMonospace);
        m_settings->registerSetting("ConsoleFontSize", defaultSize);
        m_settings->registerSetting("ConsoleMaxLines", 100000);
        m_settings->registerSetting("ConsoleOverflowStop", true);

        // Folders
        m_settings->registerSetting("InstanceDir", "instances");
        m_settings->registerSetting({"CentralModsDir", "ModsDir"}, "mods");
        m_settings->registerSetting("IconsDir", "icons");

        // Editors
        m_settings->registerSetting("JsonEditor", QString());

        // Language
        m_settings->registerSetting("Language", QString());

        // Console
        m_settings->registerSetting("ShowConsole", false);
        m_settings->registerSetting("AutoCloseConsole", false);
        m_settings->registerSetting("ShowConsoleOnError", true);
        m_settings->registerSetting("LogPrePostOutput", true);

        // Window Size
        m_settings->registerSetting({"LaunchMaximized", "MCWindowMaximize"}, false);
        m_settings->registerSetting({"MinecraftWinWidth", "MCWindowWidth"}, 854);
        m_settings->registerSetting({"MinecraftWinHeight", "MCWindowHeight"}, 480);

        // Proxy Settings
        m_settings->registerSetting("ProxyType", "None");
        m_settings->registerSetting({"ProxyAddr", "ProxyHostName"}, "127.0.0.1");
        m_settings->registerSetting("ProxyPort", 8080);
        m_settings->registerSetting({"ProxyUser", "ProxyUsername"}, "");
        m_settings->registerSetting({"ProxyPass", "ProxyPassword"}, "");

        // Memory
        m_settings->registerSetting({"MinMemAlloc", "MinMemoryAlloc"}, 512);
        m_settings->registerSetting({"MaxMemAlloc", "MaxMemoryAlloc"}, 4096);
        m_settings->registerSetting("PermGen", 128);

        // Java Settings
        m_settings->registerSetting("JavaPath", "");
        m_settings->registerSetting("JavaTimestamp", 0);
        m_settings->registerSetting("JavaArchitecture", "");
        m_settings->registerSetting("JavaVersion", "");
        m_settings->registerSetting("JavaVendor", "");
        m_settings->registerSetting("LastHostname", "");
        m_settings->registerSetting("JvmArgs", "");
        m_settings->registerSetting("IgnoreJavaCompatibility", false);
        m_settings->registerSetting("IgnoreJavaWizard", false);

        // Native library workarounds
        m_settings->registerSetting("UseNativeOpenAL", false);
        m_settings->registerSetting("UseNativeGLFW", false);

        // Game time
        m_settings->registerSetting("ShowGameTime", true);
        m_settings->registerSetting("ShowGlobalGameTime", true);
        m_settings->registerSetting("RecordGameTime", true);

        // Minecraft launch method
        m_settings->registerSetting("MCLaunchMethod", "LauncherPart");

        // Minecraft offline player name
        m_settings->registerSetting("LastOfflinePlayerName", "");

        // Wrapper command for launch
        m_settings->registerSetting("WrapperCommand", "");

        // Custom Commands
        m_settings->registerSetting({"PreLaunchCommand", "PreLaunchCmd"}, "");
        m_settings->registerSetting({"PostExitCommand", "PostExitCmd"}, "");

        // The cat
        m_settings->registerSetting("TheCat", false);

        m_settings->registerSetting("InstSortMode", "Name");
        m_settings->registerSetting("SelectedInstance", QString());

        // Window state and geometry
        m_settings->registerSetting("MainWindowState", "");
        m_settings->registerSetting("MainWindowGeometry", "");

        m_settings->registerSetting("ConsoleWindowState", "");
        m_settings->registerSetting("ConsoleWindowGeometry", "");

        m_settings->registerSetting("SettingsGeometry", "");

        m_settings->registerSetting("PagedGeometry", "");

        m_settings->registerSetting("NewInstanceGeometry", "");

        m_settings->registerSetting("UpdateDialogGeometry", "");

        // pastebin URL
        m_settings->registerSetting("PastebinURL", "https://0x0.st");

        m_settings->registerSetting("CloseAfterLaunch", false);
        m_settings->registerSetting("QuitAfterGameStop", false);

        // Custom MSA credentials
        m_settings->registerSetting("MSAClientIDOverride", "");
        m_settings->registerSetting("CFKeyOverride", "");

        // Init page provider
        {
            m_globalSettingsProvider = std::make_shared<GenericPageProvider>(tr("Settings"));
            m_globalSettingsProvider->addPage<LauncherPage>();
            m_globalSettingsProvider->addPage<MinecraftPage>();
            m_globalSettingsProvider->addPage<JavaPage>();
            m_globalSettingsProvider->addPage<LanguagePage>();
            m_globalSettingsProvider->addPage<CustomCommandsPage>();
            m_globalSettingsProvider->addPage<ProxyPage>();
            m_globalSettingsProvider->addPage<ExternalToolsPage>();
            m_globalSettingsProvider->addPage<AccountListPage>();
            m_globalSettingsProvider->addPage<APIPage>();
        }
        qDebug() << "<> Settings loaded.";
    }

#ifndef QT_NO_ACCESSIBILITY
    QAccessible::installFactory(groupViewAccessibleFactory);
#endif /* !QT_NO_ACCESSIBILITY */

    // initialize network access and proxy setup
    {
        m_network = new QNetworkAccessManager();
        QString proxyTypeStr = settings()->get("ProxyType").toString();
        QString addr = settings()->get("ProxyAddr").toString();
        int port = settings()->get("ProxyPort").value<qint16>();
        QString user = settings()->get("ProxyUser").toString();
        QString pass = settings()->get("ProxyPass").toString();
        updateProxySettings(proxyTypeStr, addr, port, user, pass);
        qDebug() << "<> Network done.";
    }

    // load translations
    {
        m_translations.reset(new TranslationsModel("translations"));
        auto bcp47Name = m_settings->get("Language").toString();
        m_translations->selectLanguage(bcp47Name);
        qDebug() << "Your language is" << bcp47Name;
        qDebug() << "<> Translations loaded.";
    }

    // initialize the updater
    if(BuildConfig.UPDATER_ENABLED)
    {
        auto platform = getIdealPlatform(BuildConfig.BUILD_PLATFORM);
        auto channelUrl = BuildConfig.UPDATER_BASE + platform + "/channels.json";
        qDebug() << "Initializing updater with platform: " << platform << " -- " << channelUrl;
        m_updateChecker.reset(new UpdateChecker(m_network, channelUrl, BuildConfig.VERSION_CHANNEL, BuildConfig.VERSION_BUILD));
        qDebug() << "<> Updater started.";
    }

    // Instance icons
    {
        auto setting = APPLICATION->settings()->getSetting("IconsDir");
        QStringList instFolders =
        {
            ":/icons/multimc/32x32/instances/",
            ":/icons/multimc/50x50/instances/",
            ":/icons/multimc/128x128/instances/",
            ":/icons/multimc/scalable/instances/"
        };
        m_icons.reset(new IconList(instFolders, setting->get().toString()));
        connect(setting.get(), &Setting::SettingChanged,[&](const Setting &, QVariant value)
        {
            m_icons->directoryChanged(value.toString());
        });
        qDebug() << "<> Instance icons intialized.";
    }

    // Icon themes
    {
        // TODO: icon themes and instance icons do not mesh well together. Rearrange and fix discrepancies!
        // set icon theme search path!
        auto searchPaths = QIcon::themeSearchPaths();
        searchPaths.append("iconthemes");
        QIcon::setThemeSearchPaths(searchPaths);
        qDebug() << "<> Icon themes initialized.";
    }

    // Initialize widget themes
    {
        auto insertTheme = [this](ITheme * theme)
        {
            m_themes.insert(std::make_pair(theme->id(), std::unique_ptr<ITheme>(theme)));
        };
        auto darkTheme = new DarkTheme();
        insertTheme(new SystemTheme());
        insertTheme(darkTheme);
        insertTheme(new BrightTheme());
        insertTheme(new CustomTheme(darkTheme, "custom"));
        qDebug() << "<> Widget themes initialized.";
    }

    // initialize and load all instances
    {
        auto InstDirSetting = m_settings->getSetting("InstanceDir");
        // instance path: check for problems with '!' in instance path and warn the user in the log
        // and remember that we have to show him a dialog when the gui starts (if it does so)
        QString instDir = InstDirSetting->get().toString();
        qDebug() << "Instance path              : " << instDir;
        if (FS::checkProblemticPathJava(QDir(instDir)))
        {
            qWarning() << "Your instance path contains \'!\' and this is known to cause java problems!";
        }
        m_instances.reset(new InstanceList(m_settings, instDir, this));
        connect(InstDirSetting.get(), &Setting::SettingChanged, m_instances.get(), &InstanceList::on_InstFolderChanged);
        qDebug() << "Loading Instances...";
        m_instances->loadList();
        qDebug() << "<> Instances loaded.";
    }

    // and accounts
    {
        m_accounts.reset(new AccountList(this));
        qDebug() << "Loading accounts...";
        m_accounts->setListFilePath("accounts.json", true);
        m_accounts->loadList();
        m_accounts->fillQueue();
        qDebug() << "<> Accounts loaded.";
    }

    // init the http meta cache
    {
        m_metacache.reset(new HttpMetaCache("metacache"));
        m_metacache->addBase("asset_indexes", QDir("assets/indexes").absolutePath());
        m_metacache->addBase("asset_objects", QDir("assets/objects").absolutePath());
        m_metacache->addBase("versions", QDir("versions").absolutePath());
        m_metacache->addBase("libraries", QDir("libraries").absolutePath());
        m_metacache->addBase("minecraftforge", QDir("mods/minecraftforge").absolutePath());
        m_metacache->addBase("fmllibs", QDir("mods/minecraftforge/libs").absolutePath());
        m_metacache->addBase("liteloader", QDir("mods/liteloader").absolutePath());
        m_metacache->addBase("general", QDir("cache").absolutePath());
        m_metacache->addBase("ATLauncherPacks", QDir("cache/ATLauncherPacks").absolutePath());
        m_metacache->addBase("FTBPacks", QDir("cache/FTBPacks").absolutePath());
        m_metacache->addBase("ModpacksCHPacks", QDir("cache/ModpacksCHPacks").absolutePath());
        m_metacache->addBase("TechnicPacks", QDir("cache/TechnicPacks").absolutePath());
        m_metacache->addBase("FlamePacks", QDir("cache/FlamePacks").absolutePath());
        m_metacache->addBase("ModrinthPacks", QDir("cache/ModrinthPacks").absolutePath());
        m_metacache->addBase("root", QDir::currentPath());
        m_metacache->addBase("translations", QDir("translations").absolutePath());
        m_metacache->addBase("icons", QDir("cache/icons").absolutePath());
        m_metacache->addBase("meta", QDir("meta").absolutePath());
        m_metacache->Load();
        qDebug() << "<> Cache initialized.";
    }

    // now we have network, download translation updates
    m_translations->downloadIndex();

    //FIXME: what to do with these?
    m_profilers.insert("jprofiler", std::shared_ptr<BaseProfilerFactory>(new JProfilerFactory()));
    m_profilers.insert("jvisualvm", std::shared_ptr<BaseProfilerFactory>(new JVisualVMFactory()));
    for (auto profiler : m_profilers.values())
    {
        profiler->registerSettings(m_settings);
    }

    // Create the MCEdit thing... why is this here?
    {
        m_mcedit.reset(new MCEditTool(m_settings));
    }

    connect(this, &Application::aboutToQuit, [this](){
        if(m_instances)
        {
            // save any remaining instance state
            m_instances->saveNow();
        }
        if(logFile)
        {
            logFile->flush();
            logFile->close();
        }
    });

    {
        setIconTheme(settings()->get("IconTheme").toString());
        qDebug() << "<> Icon theme set.";
        setApplicationTheme(settings()->get("ApplicationTheme").toString(), true);
        qDebug() << "<> Application theme set.";
    }

    if(createSetupWizard())
    {
        return;
    }
    performMainStartupAction();
}

bool Application::createSetupWizard()
{
    bool javaRequired = [&]()
    {
        bool ignoreJavaWizard = m_settings->get("IgnoreJavaWizard").toBool();
        if(ignoreJavaWizard) {
            return false;
        }
        QString currentHostName = QHostInfo::localHostName();
        QString oldHostName = settings()->get("LastHostname").toString();
        if (currentHostName != oldHostName)
        {
            settings()->set("LastHostname", currentHostName);
            return true;
        }
        QString currentJavaPath = settings()->get("JavaPath").toString();
        QString actualPath = FS::ResolveExecutable(currentJavaPath);
        if (actualPath.isNull())
        {
            return true;
        }
        return false;
    }();
    bool languageRequired = [&]()
    {
        if (settings()->get("Language").toString().isEmpty())
            return true;
        return false;
    }();
    bool wizardRequired = javaRequired || languageRequired;

    if(wizardRequired)
    {
        m_setupWizard = new SetupWizard(nullptr);
        if (languageRequired)
        {
            m_setupWizard->addPage(new LanguageWizardPage(m_setupWizard));
        }

        if (javaRequired)
        {
            m_setupWizard->addPage(new JavaWizardPage(m_setupWizard));
        }
        connect(m_setupWizard, &QDialog::finished, this, &Application::setupWizardFinished);
        m_setupWizard->show();
        return true;
    }
    return false;
}

void Application::setupWizardFinished(int status)
{
    qDebug() << "Wizard result =" << status;
    performMainStartupAction();
}

void Application::performMainStartupAction()
{
    m_status = Application::Initialized;
    if(!m_instanceIdToLaunch.isEmpty())
    {
        auto inst = instances()->getInstanceById(m_instanceIdToLaunch);
        if(inst)
        {
            MinecraftServerTargetPtr serverToJoin = nullptr;
            MinecraftAccountPtr accountToUse = nullptr;

            qDebug() << "<> Instance" << m_instanceIdToLaunch << "launching";
            if(!m_serverToJoin.isEmpty())
            {
                // FIXME: validate the server string
                serverToJoin.reset(new MinecraftServerTarget(MinecraftServerTarget::parse(m_serverToJoin)));
                qDebug() << "   Launching with server" << m_serverToJoin;
            }

            if(!m_profileToUse.isEmpty())
            {
                accountToUse = accounts()->getAccountByProfileName(m_profileToUse);
                if(!accountToUse) {
                    return;
                }
                qDebug() << "   Launching with account" << m_profileToUse;
            }

            launch(inst, true, nullptr, serverToJoin, accountToUse);
            return;
        }
    }
    if(!m_mainWindow)
    {
        // normal main window
        showMainWindow(false);
        qDebug() << "<> Main window shown.";
    }
    if(!m_zipToImport.isEmpty())
    {
        qDebug() << "<> Importing instance from zip:" << m_zipToImport;
        m_mainWindow->droppedURLs({ m_zipToImport });
    }
}

void Application::showFatalErrorMessage(const QString& title, const QString& content)
{
    m_status = Application::Failed;
    auto dialog = CustomMessageBox::selectable(nullptr, title, content, QMessageBox::Critical);
    dialog->exec();
}

Application::~Application()
{
    // Shut down logger by setting the logger function to nothing
    qInstallMessageHandler(nullptr);

#if defined Q_OS_WIN32
    // Detach from Windows console
    if(consoleAttached)
    {
        fclose(stdout);
        fclose(stdin);
        fclose(stderr);
        FreeConsole();
    }
#endif
}

void Application::messageReceived(const QByteArray& message)
{
    if(status() != Initialized)
    {
        qDebug() << "Received message" << message << "while still initializing. It will be ignored.";
        return;
    }

    ApplicationMessage received;
    received.parse(message);

    auto & command = received.command;

    if(command == "activate")
    {
        showMainWindow();
    }
    else if(command == "import")
    {
        QString path = received.args["path"];
        if(path.isEmpty())
        {
            qWarning() << "Received" << command << "message without a zip path/URL.";
            return;
        }
        m_mainWindow->droppedURLs({ QUrl(path) });
    }
    else if(command == "launch")
    {
        QString id = received.args["id"];
        QString server = received.args["server"];
        QString profile = received.args["profile"];

        InstancePtr instance;
        if(!id.isEmpty()) {
            instance = instances()->getInstanceById(id);
            if(!instance) {
                qWarning() << "Launch command requires an valid instance ID. " << id << "resolves to nothing.";
                return;
            }
        }
        else {
            qWarning() << "Launch command called without an instance ID...";
            return;
        }

        MinecraftServerTargetPtr serverObject = nullptr;
        if(!server.isEmpty()) {
            serverObject = std::make_shared<MinecraftServerTarget>(MinecraftServerTarget::parse(server));
        }

        MinecraftAccountPtr accountObject;
        if(!profile.isEmpty()) {
            accountObject = accounts()->getAccountByProfileName(profile);
            if(!accountObject) {
                qWarning() << "Launch command requires the specified profile to be valid. " << profile << "does not resolve to any account.";
                return;
            }
        }

        launch(
            instance,
            true,
            nullptr,
            serverObject,
            accountObject
        );
    }
    else
    {
        qWarning() << "Received invalid message" << message;
    }
}

std::shared_ptr<TranslationsModel> Application::translations()
{
    return m_translations;
}

std::shared_ptr<JavaInstallList> Application::javalist()
{
    if (!m_javalist)
    {
        m_javalist.reset(new JavaInstallList());
    }
    return m_javalist;
}

std::vector<ITheme *> Application::getValidApplicationThemes()
{
    std::vector<ITheme *> ret;
    auto iter = m_themes.cbegin();
    while (iter != m_themes.cend())
    {
        ret.push_back((*iter).second.get());
        iter++;
    }
    return ret;
}

bool Application::isFlatpak()
{
    #ifdef Q_OS_LINUX
    return QFile::exists("/.flatpak-info");
    #else
    return false;
    #endif
}

void Application::setApplicationTheme(const QString& name, bool initial)
{
    auto systemPalette = qApp->palette();
    auto themeIter = m_themes.find(name);
    if(themeIter != m_themes.end())
    {
        auto & theme = (*themeIter).second;
        theme->apply(initial);
    }
    else
    {
        qWarning() << "Tried to set invalid theme:" << name;
    }
}

void Application::setIconTheme(const QString& name)
{
    XdgIcon::setThemeName(name);
}

QIcon Application::getThemedIcon(const QString& name)
{
    if(name == "logo") {
        return QIcon(":/org.polymc.PolyMC.svg");
    }
    return XdgIcon::fromTheme(name);
}

bool Application::openJsonEditor(const QString &filename)
{
    const QString file = QDir::current().absoluteFilePath(filename);
    if (m_settings->get("JsonEditor").toString().isEmpty())
    {
        return DesktopServices::openUrl(QUrl::fromLocalFile(file));
    }
    else
    {
        //return DesktopServices::openFile(m_settings->get("JsonEditor").toString(), file);
        return DesktopServices::run(m_settings->get("JsonEditor").toString(), {file});
    }
}

bool Application::launch(
        InstancePtr instance,
        bool online,
        BaseProfilerFactory *profiler,
        MinecraftServerTargetPtr serverToJoin,
        MinecraftAccountPtr accountToUse
) {
    if(m_updateRunning)
    {
        qDebug() << "Cannot launch instances while an update is running. Please try again when updates are completed.";
    }
    else if(instance->canLaunch())
    {
        auto & extras = m_instanceExtras[instance->id()];
        auto & window = extras.window;
        if(window)
        {
            if(!window->saveAll())
            {
                return false;
            }
        }
        auto & controller = extras.controller;
        controller.reset(new LaunchController());
        controller->setInstance(instance);
        controller->setOnline(online);
        controller->setProfiler(profiler);
        controller->setServerToJoin(serverToJoin);
        controller->setAccountToUse(accountToUse);
        if(window)
        {
            controller->setParentWidget(window);
        }
        else if(m_mainWindow)
        {
            controller->setParentWidget(m_mainWindow);
        }
        connect(controller.get(), &LaunchController::succeeded, this, &Application::controllerSucceeded);
        connect(controller.get(), &LaunchController::failed, this, &Application::controllerFailed);
        addRunningInstance();
        controller->start();
        return true;
    }
    else if (instance->isRunning())
    {
        showInstanceWindow(instance, "console");
        return true;
    }
    else if (instance->canEdit())
    {
        showInstanceWindow(instance);
        return true;
    }
    return false;
}

bool Application::kill(InstancePtr instance)
{
    if (!instance->isRunning())
    {
        qWarning() << "Attempted to kill instance" << instance->id() << ", which isn't running.";
        return false;
    }
    auto & extras = m_instanceExtras[instance->id()];
    // NOTE: copy of the shared pointer keeps it alive
    auto controller = extras.controller;
    if(controller)
    {
        return controller->abort();
    }
    return true;
}

void Application::closeCurrentWindow()
{
    if (focusWindow())
        focusWindow()->close();
}

void Application::addRunningInstance()
{
    m_runningInstances ++;
    if(m_runningInstances == 1)
    {
        emit updateAllowedChanged(false);
    }
}

void Application::subRunningInstance()
{
    if(m_runningInstances == 0)
    {
        qCritical() << "Something went really wrong and we now have less than 0 running instances... WTF";
        return;
    }
    m_runningInstances --;
    if(m_runningInstances == 0)
    {
        emit updateAllowedChanged(true);
    }
}

bool Application::shouldExitNow() const
{
    return m_runningInstances == 0 && m_openWindows == 0;
}

bool Application::updatesAreAllowed()
{
    return m_runningInstances == 0;
}

void Application::updateIsRunning(bool running)
{
    m_updateRunning = running;
}


void Application::controllerSucceeded()
{
    auto controller = qobject_cast<LaunchController *>(QObject::sender());
    if(!controller)
        return;
    auto id = controller->id();
    auto & extras = m_instanceExtras[id];

    // on success, do...
    if (controller->instance()->settings()->get("AutoCloseConsole").toBool())
    {
        if(extras.window)
        {
            extras.window->close();
        }
    }
    extras.controller.reset();
    subRunningInstance();

    // quit when there are no more windows.
    if(shouldExitNow())
    {
        m_status = Status::Succeeded;
        exit(0);
    }
}

void Application::controllerFailed(const QString& error)
{
    Q_UNUSED(error);
    auto controller = qobject_cast<LaunchController *>(QObject::sender());
    if(!controller)
        return;
    auto id = controller->id();
    auto & extras = m_instanceExtras[id];

    // on failure, do... nothing
    extras.controller.reset();
    subRunningInstance();

    // quit when there are no more windows.
    if(shouldExitNow())
    {
        m_status = Status::Failed;
        exit(1);
    }
}

void Application::ShowGlobalSettings(class QWidget* parent, QString open_page)
{
    if(!m_globalSettingsProvider) {
        return;
    }
    emit globalSettingsAboutToOpen();
    {
        SettingsObject::Lock lock(APPLICATION->settings());
        PageDialog dlg(m_globalSettingsProvider.get(), open_page, parent);
        dlg.exec();
    }
    emit globalSettingsClosed();
}

MainWindow* Application::showMainWindow(bool minimized)
{
    if(m_mainWindow)
    {
        m_mainWindow->setWindowState(m_mainWindow->windowState() & ~Qt::WindowMinimized);
        m_mainWindow->raise();
        m_mainWindow->activateWindow();
    }
    else
    {
        m_mainWindow = new MainWindow();
        m_mainWindow->restoreState(QByteArray::fromBase64(APPLICATION->settings()->get("MainWindowState").toByteArray()));
        m_mainWindow->restoreGeometry(QByteArray::fromBase64(APPLICATION->settings()->get("MainWindowGeometry").toByteArray()));
        if(minimized)
        {
            m_mainWindow->showMinimized();
        }
        else
        {
            m_mainWindow->show();
        }

        m_mainWindow->checkInstancePathForProblems();
        connect(this, &Application::updateAllowedChanged, m_mainWindow, &MainWindow::updatesAllowedChanged);
        connect(m_mainWindow, &MainWindow::isClosing, this, &Application::on_windowClose);
        m_openWindows++;
    }
    return m_mainWindow;
}

InstanceWindow *Application::showInstanceWindow(InstancePtr instance, QString page)
{
    if(!instance)
        return nullptr;
    auto id = instance->id();
    auto & extras = m_instanceExtras[id];
    auto & window = extras.window;

    if(window)
    {
        window->raise();
        window->activateWindow();
    }
    else
    {
        window = new InstanceWindow(instance);
        m_openWindows ++;
        connect(window, &InstanceWindow::isClosing, this, &Application::on_windowClose);
    }
    if(!page.isEmpty())
    {
        window->selectPage(page);
    }
    if(extras.controller)
    {
        extras.controller->setParentWidget(window);
    }
    return window;
}

void Application::on_windowClose()
{
    m_openWindows--;
    auto instWindow = qobject_cast<InstanceWindow *>(QObject::sender());
    if(instWindow)
    {
        auto & extras = m_instanceExtras[instWindow->instanceId()];
        extras.window = nullptr;
        if(extras.controller)
        {
            extras.controller->setParentWidget(m_mainWindow);
        }
    }
    auto mainWindow = qobject_cast<MainWindow *>(QObject::sender());
    if(mainWindow)
    {
        m_mainWindow = nullptr;
    }
    // quit when there are no more windows.
    if(shouldExitNow())
    {
        exit(0);
    }
}

void Application::updateProxySettings(QString proxyTypeStr, QString addr, int port, QString user, QString password)
{
    // Set the application proxy settings.
    if (proxyTypeStr == "SOCKS5")
    {
        QNetworkProxy::setApplicationProxy(
            QNetworkProxy(QNetworkProxy::Socks5Proxy, addr, port, user, password));
    }
    else if (proxyTypeStr == "HTTP")
    {
        QNetworkProxy::setApplicationProxy(
            QNetworkProxy(QNetworkProxy::HttpProxy, addr, port, user, password));
    }
    else if (proxyTypeStr == "None")
    {
        // If we have no proxy set, set no proxy and return.
        QNetworkProxy::setApplicationProxy(QNetworkProxy(QNetworkProxy::NoProxy));
    }
    else
    {
        // If we have "Default" selected, set Qt to use the system proxy settings.
        QNetworkProxyFactory::setUseSystemConfiguration(true);
    }

    qDebug() << "Detecting proxy settings...";
    QNetworkProxy proxy = QNetworkProxy::applicationProxy();
    m_network->setProxy(proxy);

    QString proxyDesc;
    if (proxy.type() == QNetworkProxy::NoProxy)
    {
        qDebug() << "Using no proxy is an option!";
        return;
    }
    switch (proxy.type())
    {
    case QNetworkProxy::DefaultProxy:
        proxyDesc = "Default proxy: ";
        break;
    case QNetworkProxy::Socks5Proxy:
        proxyDesc = "Socks5 proxy: ";
        break;
    case QNetworkProxy::HttpProxy:
        proxyDesc = "HTTP proxy: ";
        break;
    case QNetworkProxy::HttpCachingProxy:
        proxyDesc = "HTTP caching: ";
        break;
    case QNetworkProxy::FtpCachingProxy:
        proxyDesc = "FTP caching: ";
        break;
    default:
        proxyDesc = "DERP proxy: ";
        break;
    }
    proxyDesc += QString("%1:%2")
                     .arg(proxy.hostName())
                     .arg(proxy.port());
    qDebug() << proxyDesc;
}

shared_qobject_ptr< HttpMetaCache > Application::metacache()
{
    return m_metacache;
}

shared_qobject_ptr<QNetworkAccessManager> Application::network()
{
    return m_network;
}

shared_qobject_ptr<Meta::Index> Application::metadataIndex()
{
    if (!m_metadataIndex)
    {
        m_metadataIndex.reset(new Meta::Index());
    }
    return m_metadataIndex;
}

QString Application::getJarsPath()
{
    if(m_jarsPath.isEmpty())
    {
        return FS::PathCombine(QCoreApplication::applicationDirPath(), "jars");
    }
    return FS::PathCombine(m_rootPath, m_jarsPath);
}

QString Application::getMSAClientID()
{
    QString clientIDOverride = m_settings->get("MSAClientIDOverride").toString();
    if (!clientIDOverride.isEmpty()) {
        return clientIDOverride;
    }

    return BuildConfig.MSA_CLIENT_ID;
}

QString Application::getCurseKey()
{
    QString keyOverride = m_settings->get("CFKeyOverride").toString();
    if (!keyOverride.isEmpty()) {
        return keyOverride;
    }

    return BuildConfig.CURSEFORGE_API_KEY;
}