LorenEteval_Furious/Furious/Widget/UserServersQTableWidget.py

# Copyright (C) 2024  Loren Eteval <loren.eteval@proton.me>
#
# This file is part of Furious.
#
# 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, either version 3 of the License, or
# (at your option) any later version.
#
# 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/>.

from __future__ import annotations

from Furious.Interface import *
from Furious.PyFramework import *
from Furious.QtFramework import *
from Furious.QtFramework import gettext as _
from Furious.Utility import *
from Furious.Library import *
from Furious.Core import *
from Furious.TrayActions.Import import *
from Furious.Widget.GuiHysteria1 import *
from Furious.Widget.GuiHysteria2 import *
from Furious.Widget.GuiShadowsocks import *
from Furious.Widget.GuiTrojan import *
from Furious.Widget.GuiVLESS import *
from Furious.Widget.GuiVMess import *
from Furious.Window.QRCodeWindow import *
from Furious.Window.TextEditorWindow import *

from PySide6 import QtCore
from PySide6.QtGui import *
from PySide6.QtWidgets import *
from PySide6.QtNetwork import *

from typing import Callable, Union, Sequence, MutableSequence

import queue
import logging
import icmplib
import functools

__all__ = ['UserServersQTableWidget']

logger = logging.getLogger(__name__)

registerAppSettings('ActivatedItemIndex')
registerAppSettings('ServerWidgetSectionSizeTable')


class SubscriptionManager(AppQNetworkAccessManager):
    def __init__(self, parent):
        super().__init__(parent)

        self.networkReplyTable = {}

    def handleFinishedByNetworkReply(self, networkReply):
        assert isinstance(networkReply, QNetworkReply)

        unique, webURL = (
            self.networkReplyTable[networkReply]['unique'],
            self.networkReplyTable[networkReply]['webURL'],
        )

        if networkReply.error() != QNetworkReply.NetworkError.NoError:
            logger.error(f'update subs {webURL} failed. {networkReply.errorString()}')
        else:
            logger.info(f'update subs {webURL} success')

            try:
                data = networkReply.readAll().data()

                uris = list(
                    filter(
                        lambda x: x != '',
                        PyBase64Encoder.decode(data).decode().split('\n'),
                    )
                )
            except Exception as ex:
                # Any non-exit exceptions

                logger.error(f'parse share link failed: {ex}')
            else:
                parent = self.parent()

                if isinstance(parent, UserServersQTableWidget):
                    isConnected = APP().isSystemTrayConnected()

                    subsIndexes = list(
                        index
                        for index, server in enumerate(AS_UserServers())
                        if server.getExtras('subsId') == unique
                    )

                    subsGroupIndex = -1
                    activatedIndex = AS_UserActivatedItemIndex()

                    if activatedIndex in subsIndexes:
                        for index, server in enumerate(AS_UserServers()):
                            if index <= activatedIndex:
                                if server.getExtras('subsId') == unique:
                                    subsGroupIndex += 1
                            else:
                                break

                    parent.deleteItemByIndex(
                        subsIndexes, showTrayMessage=bool(subsGroupIndex < 0)
                    )

                    remaining = len(AS_UserServers())

                    for uri in uris:
                        parent.appendNewItem(config=uri, subsId=unique)

                    if subsGroupIndex >= 0:
                        newIndex = remaining + subsGroupIndex

                        if newIndex < len(AS_UserServers()):
                            parent.activateItemByIndex(newIndex, True)

                            if isConnected and not APP().isSystemTrayConnected():
                                # Trigger connect
                                APP().systemTray.ConnectAction.trigger()

        # Done. Remove entry. Key should be found, but protect it anyway
        self.networkReplyTable.pop(networkReply, None)

    def configureHttpProxy(self, httpProxy: Union[str, None]) -> bool:
        useProxy = super().configureHttpProxy(httpProxy)

        if useProxy:
            logger.info(f'update subs uses proxy server {httpProxy}')
        else:
            logger.info(f'update subs uses no proxy')

        return useProxy

    def updateSubs(self, unique: str, webURL: str):
        networkReply = self.get(QNetworkRequest(QtCore.QUrl(webURL)))

        self.networkReplyTable[networkReply] = {
            'unique': unique,
            'webURL': webURL,
        }

        networkReply.finished.connect(
            functools.partial(
                self.handleFinishedByNetworkReply,
                networkReply,
            )
        )


class WorkerSequence(ItemUpdateProtocol):
    def __init__(self, sequence: Sequence, index: int, item: ConfigurationFactory):
        super().__init__(sequence, index, item)

    def currentItemDeleted(self) -> bool:
        return super().currentItemDeleted() or FastItemDeletionSearch.isInTrash(
            self.currentItem
        )

    def updateResult(self):
        # Extra guard
        if APP() is None or APP().isExiting():
            return

        super().updateResult()


class TestPingLatencyWorker(WorkerSequence, QtCore.QObject, QtCore.QRunnable):
    finished = QtCore.Signal(int, object)

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        # Explictly called __init__
        QtCore.QObject.__init__(self)
        QtCore.QRunnable.__init__(self)

    def updateImpl(self):
        self.finished.emit(self.currentIndex, self.currentItem)

    def run(self):
        if self.currentItemDeleted():
            # Deleted. Do nothing
            return

        assert isinstance(self.currentItem, ConfigurationFactory)

        try:
            result = icmplib.ping(
                self.currentItem.itemAddress,
                count=1,
                timeout=2,
                interval=1,
            )
        except Exception as ex:
            # Any non-exit exceptions

            def classname(ob) -> str:
                return ob.__class__.__name__

            self.currentItem.setExtras('delayResult', classname(ex))
            self.updateResult()
        else:
            # Result address should not be empty
            if result.address and result.is_alive:
                self.currentItem.setExtras('delayResult', f'{round(result.avg_rtt)}ms')
            else:
                if result.packet_loss == 1:
                    self.currentItem.setExtras('delayResult', 'Timeout')
                else:
                    self.currentItem.setExtras('delayResult', 'Error')

            self.updateResult()


class TestTcpingLatencyWorker(WorkerSequence, QtCore.QObject, QtCore.QRunnable):
    finished = QtCore.Signal(int, object)

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        # Explictly called __init__
        QtCore.QObject.__init__(self)
        QtCore.QRunnable.__init__(self)

    def updateImpl(self):
        self.finished.emit(self.currentIndex, self.currentItem)

    def run(self):
        if self.currentItemDeleted():
            # Deleted. Do nothing
            return

        assert isinstance(self.currentItem, ConfigurationFactory)

        try:
            sent, rtts = tcping(
                self.currentItem.itemAddress,
                int(self.currentItem.itemPort.split(',')[0]),
                count=1,
                timeout=2,
                interval=1,
            )
        except Exception as ex:
            # Any non-exit exceptions

            def classname(ob) -> str:
                return ob.__class__.__name__

            self.currentItem.setExtras('delayResult', classname(ex))
            self.updateResult()
        else:
            if rtts:
                self.currentItem.setExtras('delayResult', f'{round(rtts[0] * 1000)}ms')
            else:
                self.currentItem.setExtras('delayResult', 'Timeout')

            self.updateResult()


class TestDownloadSpeedWorker(WorkerSequence, QtCore.QObject):
    progressed = QtCore.Signal(int, object)

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        # Explictly called __init__
        QtCore.QObject.__init__(self)

        self.hasSpeedResult = False
        self.totalBytesRead = 0

        self.coreManager = CoreManager()

        self.networkAccessManager = QNetworkAccessManager()
        self.networkReply = None
        self.elapsedTimer = QtCore.QElapsedTimer()

    def isFinished(self) -> bool:
        if isinstance(self.networkReply, QNetworkReply):
            return self.networkReply.isFinished()
        else:
            return True

    def abort(self):
        if isinstance(self.networkReply, QNetworkReply):
            self.networkReply.abort()

    def updateImpl(self):
        self.progressed.emit(self.currentIndex, self.currentItem)

    def run(self):
        if self.currentItemDeleted():
            # Deleted. Do nothing
            return

        assert isinstance(self.currentItem, ConfigurationFactory)

        if not self.currentItem.isValid():
            self.currentItem.setExtras('speedResult', 'Invalid')
            self.updateResult()

            return

        def coreExitCallback(config: ConfigurationFactory, exitcode: int):
            if exitcode == CoreProcess.ExitCode.ConfigurationError:
                self.currentItem.setExtras('speedResult', f'Invalid')

                return self.updateResult()
            if exitcode == CoreProcess.ExitCode.ServerStartFailure:
                self.currentItem.setExtras('speedResult', f'Core start failed')

                return self.updateResult()
            if exitcode == CoreProcess.ExitCode.SystemShuttingDown:
                pass
            else:
                self.currentItem.setExtras('speedResult', f'Core exited {exitcode}')

                return self.updateResult()

        def msgCallback(line: str):
            try:
                loggerCore().appendLine(line)
            except Exception:
                # Any non-exit exceptions

                pass

        self.currentItem.setExtras('speedResult', 'Starting')
        self.updateResult()

        itemcopy = self.currentItem.deepcopy()

        if isinstance(itemcopy, ConfigurationXray):
            # Force redirect
            itemcopy['inbounds'] = [
                {
                    'tag': 'http',
                    'port': 20809,
                    'listen': '127.0.0.1',
                    'protocol': 'http',
                    'sniffing': {
                        'enabled': True,
                        'destOverride': [
                            'http',
                            'tls',
                        ],
                    },
                    'settings': {
                        'auth': 'noauth',
                        'udp': True,
                        'allowTransparent': False,
                    },
                },
            ]

            try:
                for outboundObject in itemcopy['outbounds']:
                    if outboundObject['tag'] == 'proxy':
                        # Avoid confusion with potentially existing 'proxy' tag
                        outboundObject['tag'] = 'proxy20809'
            except Exception:
                # Any non-exit exceptions

                pass

            self.coreManager.start(
                itemcopy,
                'Global',
                coreExitCallback,
                msgCallbackCore=msgCallback,
                deepcopy=False,
                proxyModeOnly=True,
                log=False,
            )
        elif isinstance(itemcopy, ConfigurationHysteria1) or isinstance(
            itemcopy, ConfigurationHysteria2
        ):
            # Force redirect
            itemcopy['http'] = {
                'listen': '127.0.0.1:20809',
                'timeout': 300,
                'disable_udp': False,
            }
            # No socks inbounds
            itemcopy.pop('socks5', '')

            self.coreManager.start(
                itemcopy,
                'Global',
                coreExitCallback,
                msgCallbackCore=msgCallback,
                deepcopy=False,
                proxyModeOnly=True,
                log=False,
            )
        else:
            self.currentItem.setExtras('speedResult', 'Invalid')
            self.updateResult()

            return

        self.networkAccessManager.setProxy(
            QNetworkProxy(QNetworkProxy.ProxyType.HttpProxy, '127.0.0.1', 20809)
        )
        self.networkReply = self.networkAccessManager.get(
            QNetworkRequest(
                QtCore.QUrl(
                    'http://speed.cloudflare.com/__down?during=download&bytes=104857600'
                )
            )
        )
        self.networkReply.readyRead.connect(self.handleReadyRead)
        self.networkReply.finished.connect(self.handleFinished)
        self.elapsedTimer.start()

    @QtCore.Slot()
    def handleReadyRead(self):
        if self.coreManager.allRunning():
            self.totalBytesRead += self.networkReply.readAll().length()

            # Convert to seconds
            elapsedSecond = self.elapsedTimer.elapsed() / 1000
            downloadSpeed = self.totalBytesRead / elapsedSecond / 1024 / 1024

            # Has speed test result
            self.hasSpeedResult = True
            self.currentItem.setExtras('speedResult', f'{downloadSpeed:.2f} MiB/s')
            self.updateResult()

    @QtCore.Slot()
    def handleFinished(self):
        if self.networkReply.error() != QNetworkReply.NetworkError.NoError:
            if not self.hasSpeedResult:
                if not self.coreManager.allRunning():
                    # Core ExitCallback has been called
                    return

                if (
                    self.networkReply.error()
                    == QNetworkReply.NetworkError.OperationCanceledError
                ):
                    # Canceled by application
                    self.currentItem.setExtras('speedResult', 'Canceled')
                else:
                    try:
                        error = self.networkReply.error().name
                    except Exception:
                        # Any non-exit exceptions

                        error = 'UnknownError'

                    if isinstance(error, bytes):
                        # Some old version PySide6 returns it as bytes. Protect it.
                        errorString = error.decode('utf-8', 'replace')
                    elif isinstance(error, str):
                        errorString = error
                    else:
                        errorString = 'UnknownError'

                    if errorString != 'UnknownError' and errorString.endswith('Error'):
                        self.currentItem.setExtras('speedResult', errorString[:-5])
                    else:
                        self.currentItem.setExtras('speedResult', errorString)
        else:
            if self.coreManager.allRunning():
                self.totalBytesRead += self.networkReply.readAll().length()

                # Convert to seconds
                elapsedSecond = self.elapsedTimer.elapsed() / 1000
                downloadSpeed = self.totalBytesRead / elapsedSecond / 1024 / 1024

                self.currentItem.setExtras('speedResult', f'{downloadSpeed:.2f} MiB/s')
            else:
                self.currentItem.setExtras('speedResult', f'Core start failed')

        self.coreManager.stopAll()
        self.updateResult()


class UserServersQTableWidgetHorizontalHeader(AppQHeaderView):
    class SortOrder:
        Ascending_ = False
        Descending = True

    @staticmethod
    def emptyClickGuard():
        return False

    def __init__(self, *args, **kwargs):
        self.clickGuardFn = kwargs.pop('clickGuardFn', self.emptyClickGuard)
        self.customSortFn = kwargs.pop('customSortFn', None)

        super().__init__(QtCore.Qt.Orientation.Horizontal, *args, **kwargs)

        self.sortOrderTable = list(
            self.SortOrder.Ascending_ for i in range(self.columnCount)
        )

        self.sectionClicked.connect(self.handleSectionClicked)

    def customSort(self, clickedIndex):
        self.customSortFn(clickedIndex, reverse=self.sortOrderTable[clickedIndex])
        # Toggle
        self.sortOrderTable[clickedIndex] = not self.sortOrderTable[clickedIndex]

    @QtCore.Slot(int)
    def handleSectionClicked(self, clickedIndex: int):
        if callable(self.clickGuardFn) and self.clickGuardFn():
            # Guarded. Do nothing
            return

        if self.customSortFn is None:
            # Sorting not supported
            return

        parent = self.parent()

        if isinstance(parent, AppQTableWidget):
            # Support item activation
            activatedIndex = AS_UserActivatedItemIndex()

            if activatedIndex < 0:
                activatedServerId = None
            else:
                activatedServerId = id(AS_UserServers()[activatedIndex])

                # De-activated temporarily for sorting
                parent.activateItemByIndex(activatedIndex, False)

            self.customSort(clickedIndex)

            if activatedServerId is not None:
                foundActivatedItem = False

                for index, server in enumerate(AS_UserServers()):
                    if activatedServerId == id(server):
                        foundActivatedItem = True

                        parent.setCurrentItem(parent.item(index, 0))
                        parent.activateItemByIndex(index, True)

                        break

                # Object id should be found
                assert foundActivatedItem

        else:
            # Not yet implemented
            pass


class UserServersQTableWidgetVerticalHeader(AppQHeaderView):
    def __init__(self, *args, **kwargs):
        super().__init__(QtCore.Qt.Orientation.Vertical, *args, **kwargs)


class UserServersQTableWidgetHeaders:
    def __init__(self, name: str, func: Callable[[ConfigurationFactory], str] = None):
        self.name = name
        self.func = func

    def __call__(self, item: ConfigurationFactory) -> str:
        if callable(self.func):
            return self.func(item)
        else:
            return getattr(item, f'item{self}')

    def __eq__(self, other):
        return str(self) == str(other)

    def __str__(self):
        return self.name


# ALL Headers VALUE
TRANSLATABLE_HEADERS = [
    _('Remark'),
    _('Protocol'),
    _('Address'),
    _('Port'),
    _('Transport'),
    _('TLS'),
    _('Subscription'),
    _('Latency'),
    _('Speed'),
]


class UserServersQTableWidget(QTranslatable, AppQTableWidget):
    Headers = [
        UserServersQTableWidgetHeaders('Remark'),
        UserServersQTableWidgetHeaders('Protocol'),
        UserServersQTableWidgetHeaders('Address'),
        UserServersQTableWidgetHeaders('Port'),
        UserServersQTableWidgetHeaders('Transport'),
        UserServersQTableWidgetHeaders('TLS'),
        UserServersQTableWidgetHeaders('Subscription'),
        UserServersQTableWidgetHeaders('Latency'),
        UserServersQTableWidgetHeaders('Speed'),
    ]

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        self.subsManager = SubscriptionManager(parent=self)

        self.testDownloadSpeedQueue = queue.Queue()
        self.testDownloadSpeedTimer = QtCore.QTimer()
        self.testDownloadSpeedTimer.timeout.connect(self.handleTestDownloadSpeedJob)

        # Text Editor Window
        self.textEditorWindow = TextEditorWindow(parent=self.parent())

        # Must set before flush all
        self.setColumnCount(len(self.Headers))

        # Flush all data to table
        self.flushAll()

        # Install custom header
        self.setHorizontalHeader(
            UserServersQTableWidgetHorizontalHeader(
                parent=self,
                clickGuardFn=lambda: False,
                customSortFn=self.customSortFn,
                sectionSizeSettingsName='ServerWidgetSectionSizeTable',
            )
        )
        self.setVerticalHeader(UserServersQTableWidgetVerticalHeader(self))

        self.horizontalHeader().setCustomSectionResizeMode()
        self.horizontalHeader().restoreSectionSize()

        self.setHorizontalHeaderLabels(list(_(str(header)) for header in self.Headers))

        # Selection
        self.setSelectionColor(AppHue.disconnectedColor())
        self.setSelectionBehavior(QTableWidget.SelectionBehavior.SelectRows)
        self.setSelectionMode(QTableWidget.SelectionMode.ExtendedSelection)

        # No drag and drop
        self.setDragEnabled(False)
        self.setDragDropMode(QAbstractItemView.DragDropMode.NoDragDrop)
        self.setDropIndicatorShown(False)
        self.setDefaultDropAction(QtCore.Qt.DropAction.IgnoreAction)

        self.editConfigActionRef = AppQAction(
            _('Customize JSON Configuration...'),
            icon=bootstrapIcon('pencil-square.svg'),
            callback=lambda: self.editSelectedItemConfiguration(),
            shortcut=QtCore.QKeyCombination(
                QtCore.Qt.KeyboardModifier.ControlModifier,
                QtCore.Qt.Key.Key_E,
            ),
        )

        contextMenuActions = [
            AppQAction(
                _('Move Up'),
                callback=lambda: self.moveUpSelectedItem(),
            ),
            AppQAction(
                _('Move Down'),
                callback=lambda: self.moveDownSelectedItem(),
            ),
            AppQAction(
                _('Duplicate'),
                callback=lambda: self.duplicateSelectedItem(),
            ),
            AppQAction(
                _('Delete'),
                callback=lambda: self.deleteSelectedItem(),
            ),
            AppQSeperator(),
            self.editConfigActionRef,
            AppQSeperator(),
            AppQAction(
                _('Select All'),
                callback=lambda: self.selectAll(),
                shortcut=QtCore.QKeyCombination(
                    QtCore.Qt.KeyboardModifier.ControlModifier,
                    QtCore.Qt.Key.Key_A,
                ),
            ),
            AppQSeperator(),
            AppQAction(
                _('Scroll To Activated Server'),
                callback=lambda: self.scrollToActivatedItem(),
                shortcut=QtCore.QKeyCombination(
                    QtCore.Qt.KeyboardModifier.ControlModifier,
                    QtCore.Qt.Key.Key_G,
                ),
            ),
            AppQSeperator(),
            AppQAction(
                _('Test Ping Latency'),
                callback=lambda: self.testSelectedItemPingLatency(),
                shortcut=QtCore.QKeyCombination(
                    QtCore.Qt.KeyboardModifier.ControlModifier,
                    QtCore.Qt.Key.Key_P,
                ),
            ),
            AppQAction(
                _('Test Tcping Latency'),
                callback=lambda: self.testSelectedItemTcpingLatency(),
                shortcut=QtCore.QKeyCombination(
                    QtCore.Qt.KeyboardModifier.ControlModifier,
                    QtCore.Qt.Key.Key_O,
                ),
            ),
            AppQAction(
                _('Test Download Speed'),
                callback=lambda: self.testSelectedItemDownloadSpeed(),
                shortcut=QtCore.QKeyCombination(
                    QtCore.Qt.KeyboardModifier.ControlModifier,
                    QtCore.Qt.Key.Key_T,
                ),
            ),
            AppQAction(
                _('Clear Test Results'),
                callback=lambda: self.clearSelectedItemTestResult(),
                shortcut=QtCore.QKeyCombination(
                    QtCore.Qt.KeyboardModifier.ControlModifier,
                    QtCore.Qt.Key.Key_R,
                ),
            ),
            AppQSeperator(),
            AppQAction(
                _('New Empty Configuration'),
                callback=lambda: self.newEmptyItem(),
                shortcut=QtCore.QKeyCombination(
                    QtCore.Qt.KeyboardModifier.ControlModifier,
                    QtCore.Qt.Key.Key_N,
                ),
            ),
            ImportFromFileAction(),
            ImportURIFromClipboardAction(
                shortcut=QtCore.QKeyCombination(
                    QtCore.Qt.KeyboardModifier.ControlModifier,
                    QtCore.Qt.Key.Key_V,
                ),
            ),
            ImportJSONFromClipboardAction(
                shortcut=QtCore.QKeyCombination(
                    QtCore.Qt.KeyboardModifier.ControlModifier
                    | QtCore.Qt.KeyboardModifier.ShiftModifier,
                    QtCore.Qt.Key.Key_J,
                ),
            ),
            AppQSeperator(),
            AppQAction(
                _('Export Share Link To Clipboard'),
                callback=lambda: self.exportSelectedItemURI(),
                shortcut=QtCore.QKeyCombination(
                    QtCore.Qt.KeyboardModifier.ControlModifier,
                    QtCore.Qt.Key.Key_C,
                ),
            ),
            AppQAction(
                _('Export As QR Code'),
                icon=bootstrapIcon('qr-code.svg'),
                callback=lambda: self.exportSelectedItemQR(),
            ),
            AppQAction(
                _('Export JSON Configuration To Clipboard'),
                callback=lambda: self.exportSelectedItemJSON(),
                shortcut=QtCore.QKeyCombination(
                    QtCore.Qt.KeyboardModifier.ControlModifier,
                    QtCore.Qt.Key.Key_J,
                ),
            ),
        ]

        self.contextMenu = AppQMenu(*contextMenuActions)

        # Add actions to self in order to activate shortcuts
        self.addActions(self.contextMenu.actions())
        self.setContextMenuPolicy(QtCore.Qt.ContextMenuPolicy.CustomContextMenu)
        self.customContextMenuRequested.connect(self.handleCustomContextMenuRequested)

        # Distinguish double-click and activated
        self.doubleClickedFlag = False

        # Signals
        self.itemChanged.connect(self.handleItemChanged)
        self.itemSelectionChanged.connect(self.handleItemSelectionChanged)
        self.itemActivated.connect(self.handleItemActivated)
        self.itemDoubleClicked.connect(self.handleItemDoubleClicked)

        if self.activatedItem() is not None:
            self.setCurrentItem(self.activatedItem())
            self.activateItemByIndex(AS_UserActivatedItemIndex(), True)

    @QtCore.Slot(QTableWidgetItem)
    def handleItemChanged(self, item: QTableWidgetItem):
        index = item.row()

        if self.item(index, 0) is None:
            return

        itemText = self.item(index, 0).text()

        if AS_UserServers()[index].getExtras('remark') != itemText:
            AS_UserServers()[index].setExtras('remark', itemText)

    @QtCore.Slot()
    def handleItemSelectionChanged(self):
        if len(self.selectedIndex) > 1:
            self.editConfigActionRef.setDisabled(True)
        else:
            self.editConfigActionRef.setDisabled(False)

    @QtCore.Slot(QTableWidgetItem)
    def handleItemActivated(self, item: QTableWidgetItem):
        if self.doubleClickedFlag:
            # Ignore double-click
            self.doubleClickedFlag = False

            return

        oldIndex = AS_UserActivatedItemIndex()
        newIndex = item.row()

        if oldIndex == newIndex:
            # Same item activated. Do nothing
            return

        if APP().systemTray.ConnectAction.isConnecting():
            mbox = AppQMessageBox(icon=AppQMessageBox.Icon.Information)
            mbox.setWindowTitle(_('Connecting'))
            mbox.setText(_('Connecting. Please wait...'))

            if PLATFORM != 'Darwin':
                # Show the MessageBox asynchronously
                mbox.open()
            else:
                # Show the MessageBox asynchronously
                # TODO: Verify
                mbox.open()

            return

        if oldIndex >= 0:
            self.activateItemByIndex(oldIndex, False)

        self.activateItemByIndex(newIndex, True)

        if APP().isSystemTrayConnected():
            APP().systemTray.ConnectAction.doDisconnect()
            APP().systemTray.ConnectAction.trigger()

    @functools.lru_cache(None)
    def getGuiEditorByProtocol(self, protocol, **kwargs):
        logger.debug(f'getGuiEditorByProtocol called with protocol {protocol}')

        if protocolRepr(protocol) == Protocol.VMess:
            return GuiVMess(parent=self, **kwargs)
        if protocolRepr(protocol) == Protocol.VLESS:
            return GuiVLESS(parent=self, **kwargs)
        if protocolRepr(protocol) == Protocol.Shadowsocks:
            return GuiShadowsocks(parent=self, **kwargs)
        if protocolRepr(protocol) == Protocol.Trojan:
            return GuiTrojan(parent=self, **kwargs)
        if protocolRepr(protocol) == Protocol.Hysteria2:
            return GuiHysteria2(parent=self, **kwargs)
        if protocolRepr(protocol) == Protocol.Hysteria1:
            return GuiHysteria1(parent=self, **kwargs)

        return None

    def getGuiEditorByFactory(self, factory, **kwargs):
        if isinstance(factory, ConfigurationXray):
            protocol = factory.proxyProtocol

            guiEditor = self.getGuiEditorByProtocol(protocol, **kwargs)
        elif isinstance(factory, ConfigurationHysteria2):
            guiEditor = self.getGuiEditorByProtocol(Protocol.Hysteria2, **kwargs)
        elif isinstance(factory, ConfigurationHysteria1):
            guiEditor = self.getGuiEditorByProtocol(Protocol.Hysteria1, **kwargs)
        else:
            guiEditor = None

        return guiEditor

    @QtCore.Slot(QTableWidgetItem)
    def handleItemDoubleClicked(self, item: QTableWidgetItem):
        self.doubleClickedFlag = True

        index = item.row()
        factory = AS_UserServers()[index]

        guiEditor = self.getGuiEditorByFactory(factory, translatable=False)

        if guiEditor is None:
            # Unrecognized.
            showUnrecognizedConfigMBox()

            return

        guiEditor.setWindowTitle(f'{index + 1} - ' + factory.getExtras('remark'))

        try:
            guiEditor.factoryToInput(factory)
        except Exception as ex:
            # Any non-exit exceptions

            logger.error(f'error while converting factory to input: {ex}')

        guiEditor.accepted.connect(
            functools.partial(
                self.handleGuiEditorAccepted,
                guiEditor,
                index,
                factory,
            )
        )
        guiEditor.rejected.connect(
            functools.partial(
                self.handleGuiEditorRejected,
                guiEditor,
            )
        )
        guiEditor.open()

    def handleGuiEditorAccepted(
        self,
        editor: GuiEditorWidgetQDialog,
        index: int,
        factory: ConfigurationFactory,
    ):
        logger.debug(f'guiEditor accepted with index {index}')

        modified = editor.inputToFactory(factory)

        # Still flush to row since remark may be modified
        self.flushRow(index, factory)

        if modified and index == AS_UserActivatedItemIndex():
            showNewChangesNextTimeMBox()

        editor.accepted.disconnect()
        editor.rejected.disconnect()

    @staticmethod
    def handleGuiEditorRejected(editor: GuiEditorWidgetQDialog):
        editor.accepted.disconnect()
        editor.rejected.disconnect()

    @QtCore.Slot(QtCore.QPoint)
    def handleCustomContextMenuRequested(self, point):
        self.contextMenu.exec(self.mapToGlobal(point))

    def customSortFn(self, clickedIndex, **kwargs):
        def keyFn(server):
            data = self.Headers[clickedIndex](server)

            if clickedIndex == self.Headers.index('Latency'):
                if data.endswith('ms'):
                    # Strip value
                    data = data[:-2]

                try:
                    return float(data)
                except Exception:
                    # Any non-exit exceptions

                    return abs(hash(data)) + 2**20

            if clickedIndex == self.Headers.index('Speed'):
                if data.endswith(' MiB/s'):
                    # Strip value
                    data = data[:-6]

                try:
                    return float(data)
                except Exception:
                    # Any non-exit exceptions

                    return abs(hash(data)) + 2**20

            return data

        AS_UserServers().sort(key=keyFn, **kwargs)

        self.flushAll()

    def activatedItem(self) -> QTableWidgetItem:
        return self.item(AS_UserActivatedItemIndex(), 0)

    def activateItemByIndex(self, index, activate):
        super().activateItemByIndex(index, activate)

        if activate:
            AppSettings.set('ActivatedItemIndex', str(index))

    def flushItem(self, row: int, column: int, item: ConfigurationFactory):
        header = self.Headers[column]

        oldItem = self.item(row, column)
        newItem = QTableWidgetItem(header(item))

        if oldItem is None:
            # Item does not exist
            newItem.setFont(QFont(APP().customFontName))

            if str(header) == 'Latency' or str(header) == 'Speed':
                # Test results. Align right and vcenter
                newItem.setTextAlignment(
                    QtCore.Qt.AlignmentFlag.AlignRight
                    | QtCore.Qt.AlignmentFlag.AlignVCenter
                )
        else:
            # Use existing
            newItem.setFont(oldItem.font())
            newItem.setForeground(oldItem.foreground())

            if oldItem.textAlignment() != 0:
                newItem.setTextAlignment(oldItem.textAlignment())

        #
        # Legacy flags. Not used
        #
        # if str(header) == 'Remark':
        #     # Remark is editable
        #     newItem.setFlags(
        #         QtCore.Qt.ItemFlag.ItemIsEnabled
        #         | QtCore.Qt.ItemFlag.ItemIsSelectable
        #         | QtCore.Qt.ItemFlag.ItemIsEditable
        #     )
        # else:
        #     newItem.setFlags(
        #         QtCore.Qt.ItemFlag.ItemIsEnabled | QtCore.Qt.ItemFlag.ItemIsSelectable
        #     )

        # Remark is now editable via GUI window
        newItem.setFlags(
            QtCore.Qt.ItemFlag.ItemIsEnabled | QtCore.Qt.ItemFlag.ItemIsSelectable
        )

        self.setItem(row, column, newItem)

    def addServerViaGui(
        self,
        protocol: str,
        windowTitle: str = APPLICATION_NAME,
        **kwargs,
    ):
        factory = getEmptyFactory(protocol)

        guiEditor = self.getGuiEditorByFactory(factory, **kwargs)

        if guiEditor is None:
            # Unrecognized. Do nothing
            return

        guiEditor.setWindowTitle(windowTitle)

        try:
            guiEditor.factoryToInput(factory)
        except Exception as ex:
            # Any non-exit exceptions

            logger.error(f'error while converting factory to input: {ex}')

        guiEditor.accepted.connect(
            functools.partial(
                self.handleAddServerViaGuiAccepted,
                guiEditor,
                factory,
            )
        )
        guiEditor.rejected.connect(
            functools.partial(
                self.handleAddServerViaGuiRejected,
                guiEditor,
            )
        )
        guiEditor.open()

    def handleAddServerViaGuiAccepted(
        self,
        editor: GuiEditorWidgetQDialog,
        factory: ConfigurationFactory,
    ):
        editor.inputToFactory(factory)

        self.appendNewItemByFactory(factory)

        editor.accepted.disconnect()
        editor.rejected.disconnect()

    def handleAddServerViaGuiRejected(self, editor: GuiEditorWidgetQDialog):
        editor.accepted.disconnect()
        editor.rejected.disconnect()

    def flushRow(self, row: int, item: ConfigurationFactory):
        for column in list(range(self.columnCount())):
            self.flushItem(row, column, item)

    def flushAll(self):
        if self.rowCount() == 0:
            # Should insert row
            for index, item in enumerate(AS_UserServers()):
                self.insertRow(index)
                self.flushRow(index, item)
        else:
            for index, item in enumerate(AS_UserServers()):
                self.flushRow(index, item)

    def swapItem(self, index0: int, index1: int):
        def swapSequenceItem(sequence: MutableSequence, param0: int, param1: int):
            swap = sequence[param0]

            sequence[param0] = sequence[param1]
            sequence[param1] = swap

        swapSequenceItem(AS_UserServers(), index0, index1)

        self.flushRow(index0, AS_UserServers()[index0])
        self.flushRow(index1, AS_UserServers()[index1])

        if index0 == AS_UserActivatedItemIndex():
            # De-activate
            self.activateItemByIndex(index0, False)
            # Activate
            self.activateItemByIndex(index1, True)
        elif index1 == AS_UserActivatedItemIndex():
            # De-activate
            self.activateItemByIndex(index1, False)
            # Activate
            self.activateItemByIndex(index0, True)

    def newEmptyItem(self):
        self.appendNewItem(remark=_('Untitled'), acceptInvalid=True)

    def moveUpItemByIndex(self, index):
        if index <= 0 or index >= len(AS_UserServers()):
            # The top item, or does not exist. Do nothing
            return

        self.swapItem(index, index - 1)

    def moveUpSelectedItem(self):
        indexes = self.selectedIndex

        if len(indexes) == 0:
            # Nothing selected. Do nothing
            return

        for index in indexes:
            self.moveUpItemByIndex(index)

        with QBlockSignals(self):
            self.setCurrentIndex(self.indexFromItem(self.item(indexes[-1] - 1, 0)))

        self.selectMultipleRows(list(index - 1 for index in indexes), True)

    def moveDownItemByIndex(self, index):
        if index < 0 or index >= len(AS_UserServers()) - 1:
            # The bottom item, or does not exist. Do nothing
            return

        self.swapItem(index, index + 1)

    def moveDownSelectedItem(self):
        indexes = self.selectedIndex

        if len(indexes) == 0:
            # Nothing selected. Do nothing
            return

        for index in indexes[::-1]:
            self.moveDownItemByIndex(index)

        with QBlockSignals(self):
            self.setCurrentIndex(self.indexFromItem(self.item(indexes[0] + 1, 0)))

        self.selectMultipleRows(list(index + 1 for index in indexes), True)

    def duplicateSelectedItem(self):
        indexes = self.selectedIndex

        if len(indexes) == 0:
            # Nothing selected. Do nothing
            return

        for index in indexes:
            if 0 <= index < len(AS_UserServers()):
                # Do not clone subsId
                self.appendNewItem(
                    remark=AS_UserServers()[index].getExtras('remark'),
                    config=AS_UserServers()[index],
                )

    def deleteItemByIndex(self, indexes, showTrayMessage=True) -> int:
        if len(indexes) == 0:
            # Nothing selected. Do nothing
            return 0

        if AS_UserActivatedItemIndex() in indexes:
            deleteActivated = True
        else:
            deleteActivated = False

        for i in range(len(indexes)):
            deleteIndex = indexes[i] - i

            with QBlockSignals(self):
                self.removeRow(deleteIndex)

            FastItemDeletionSearch.moveToTrash(AS_UserServers()[deleteIndex])

            AS_UserServers().pop(deleteIndex)

            if not deleteActivated and deleteIndex < AS_UserActivatedItemIndex():
                AppSettings.set(
                    'ActivatedItemIndex', str(AS_UserActivatedItemIndex() - 1)
                )

        if deleteActivated:
            # Set invalid first
            AppSettings.set('ActivatedItemIndex', str(-1))

            if APP().isSystemTrayConnected():
                if showTrayMessage:
                    # Trigger disconnect
                    APP().systemTray.ConnectAction.trigger()
                else:
                    # Trigger disconnect silently
                    APP().systemTray.ConnectAction.doDisconnect()

        return len(indexes)

    def deleteSelectedItem(self):
        indexes = self.selectedIndex

        if len(indexes) == 0:
            # Nothing selected. Do nothing
            return

        def handleResultCode(_indexes, code):
            if code == PySide6LegacyEnumValueWrapper(AppQMessageBox.StandardButton.Yes):
                self.deleteItemByIndex(_indexes)
            else:
                pass

        if PLATFORM == 'Windows':
            # Windows
            mbox = QuestionDeleteMBox(icon=AppQMessageBox.Icon.Question)
        else:
            # macOS & linux
            mbox = QuestionDeleteMBox(
                icon=AppQMessageBox.Icon.Question, parent=self.parent()
            )
            mbox.setWindowModality(QtCore.Qt.WindowModality.WindowModal)

        mbox.isMulti = bool(len(indexes) > 1)
        mbox.possibleRemark = f'{indexes[0] + 1} - {self.item(indexes[0], 0).text()}'
        mbox.setText(mbox.customText())
        mbox.finished.connect(functools.partial(handleResultCode, indexes))

        # dummy ref
        setattr(self, '_questionDeleteMBox', mbox)

        # Show the MessageBox asynchronously
        mbox.open()

    def editSelectedItemConfiguration(self):
        indexes = self.selectedIndex

        if len(indexes) == 0:
            # Nothing selected. Do nothing
            return

        if len(indexes) != 1:
            # Should not reach here
            return

        index = indexes[0]
        title = f'{index + 1} - ' + AS_UserServers()[index].getExtras('remark')

        self.textEditorWindow.currentIndex = index
        self.textEditorWindow.customWindowTitle = title
        self.textEditorWindow.setWindowTitle(title)
        self.textEditorWindow.setPlainText(AS_UserServers()[index].toJSONString(), True)
        self.textEditorWindow.show()

    def scrollToActivatedItem(self):
        activatedItem = self.activatedItem()

        self.setCurrentItem(activatedItem)
        self.scrollToItem(activatedItem)

    def testSelectedItemPingLatency(self):
        indexes = self.selectedIndex

        if len(indexes) == 0:
            # Nothing selected. Do nothing
            return

        # Real selected factory
        references = list(AS_UserServers()[index] for index in indexes)

        for index, reference in zip(indexes, references):
            worker = TestPingLatencyWorker(AS_UserServers(), index, reference)

            worker.setAutoDelete(True)
            worker.finished.connect(
                lambda paramIndex, paramFactory: self.flushItem(
                    paramIndex, self.Headers.index('Latency'), paramFactory
                )
            )

            APP().threadPool.start(worker)

    def testSelectedItemTcpingLatency(self):
        indexes = self.selectedIndex

        if len(indexes) == 0:
            # Nothing selected. Do nothing
            return

        # Real selected factory
        references = list(AS_UserServers()[index] for index in indexes)

        for index, reference in zip(indexes, references):
            worker = TestTcpingLatencyWorker(AS_UserServers(), index, reference)

            worker.setAutoDelete(True)
            worker.finished.connect(
                lambda paramIndex, paramFactory: self.flushItem(
                    paramIndex, self.Headers.index('Latency'), paramFactory
                )
            )

            APP().threadPool.start(worker)

    @QtCore.Slot()
    def handleTestDownloadSpeedJob(self):
        try:
            index, server = self.testDownloadSpeedQueue.get_nowait()
        except queue.Empty:
            # Queue is empty

            # Power Optimization. Timer gets fired only when needed
            self.testDownloadSpeedTimer.stop()

            return

        assert isinstance(server, ConfigurationFactory)

        def testDownloadSpeed(counter=0, timeout=5000, step=100):
            worker = TestDownloadSpeedWorker(AS_UserServers(), index, server)
            worker.progressed.connect(
                lambda paramIndex, paramFactory: self.flushItem(
                    paramIndex, self.Headers.index('Speed'), paramFactory
                )
            )
            worker.run()

            while (
                not APP().isExiting() and not worker.isFinished() and counter < timeout
            ):
                PySide6LegacyEventLoopWait(step)

                counter += step

            if not worker.isFinished():
                worker.abort()

                while not worker.isFinished():
                    PySide6LegacyEventLoopWait(step)

            if APP().isExiting():
                # Stop timer
                self.testDownloadSpeedTimer.stop()

        testDownloadSpeed()

    def testSelectedItemDownloadSpeed(self):
        indexes = self.selectedIndex

        if len(indexes) == 0:
            # Nothing selected. Do nothing
            return

        # Real selected factory
        references = list(AS_UserServers()[index] for index in indexes)

        for index, reference in zip(indexes, references):
            try:
                # Served by FIFO
                self.testDownloadSpeedQueue.put_nowait((index, reference))
            except Exception:
                # Any non-exit exceptions

                pass

        # Power Optimization
        if not self.testDownloadSpeedTimer.isActive():
            self.testDownloadSpeedTimer.start(250)

    def clearSelectedItemTestResult(self):
        indexes = self.selectedIndex

        if len(indexes) == 0:
            # Nothing selected. Do nothing
            return

        for index in indexes:
            factory = AS_UserServers()[index]
            factory.setExtras('delayResult', '')
            factory.setExtras('speedResult', '')

            self.flushItem(index, self.Headers.index('Latency'), factory)
            self.flushItem(index, self.Headers.index('Speed'), factory)

    def updateSubs(self, httpProxy: Union[str, None]):
        self.subsManager.configureHttpProxy(httpProxy)

        for key, value in AS_UserSubscription().items():
            self.subsManager.updateSubs(key, value.get('webURL', ''))

    def appendNewItemByFactory(self, factory: ConfigurationFactory):
        AS_UserServers().append(factory)

        row = self.rowCount()

        self.insertRow(row)
        self.flushRow(row, factory)

        if len(AS_UserServers()) == 1:
            # The first one. Click it
            self.setCurrentItem(self.item(0, 0))

            # Try to be user-friendly in some extreme cases
            if not APP().isSystemTrayConnected():
                # Activate automatically
                self.activateItemByIndex(0, True)

    def appendNewItem(self, **kwargs):
        acceptInvalid = kwargs.pop('acceptInvalid', False)

        model = {
            'remark': kwargs.pop('remark', ''),
            'config': kwargs.pop('config', ''),
            'subsId': kwargs.pop('subsId', ''),
        }
        tostr = f'{model}'

        factory = constructFromAny(model.pop('config', ''), **model)

        if factory.isValid():
            self.appendNewItemByFactory(factory)
        else:
            if acceptInvalid:
                self.appendNewItemByFactory(factory)
            else:
                logger.error(f'invalid item: {tostr}')

    def exportSelectedItemURI(self):
        indexes = self.selectedIndex

        if len(indexes) == 0:
            # Nothing selected. Do nothing
            return

        def toURI(factory) -> str:
            assert isinstance(factory, ConfigurationFactory)

            try:
                return factory.toURI()
            except Exception:
                # Any non-exit exceptions

                return ''

        # TODO: MessageBox?
        QApplication.clipboard().setText(
            '\n'.join(list(toURI(AS_UserServers()[index]) for index in indexes))
        )

    def exportSelectedItemQR(self):
        indexes = self.selectedIndex

        if len(indexes) == 0:
            # Nothing selected. Do nothing
            return

        window = QRCodeWindow()
        window.initTabByIndex(indexes)

        if window.tabCount() > 0:
            window.show()

    def exportSelectedItemJSON(self):
        indexes = self.selectedIndex

        if len(indexes) == 0:
            # Nothing selected. Do nothing
            return

        # TODO: MessageBox?
        QApplication.clipboard().setText(
            '\n'.join(list(AS_UserServers()[index].toJSONString() for index in indexes))
        )

    def showTabAndSpaces(self):
        self.textEditorWindow.showTabAndSpaces()

    def hideTabAndSpaces(self):
        self.textEditorWindow.hideTabAndSpaces()

    def keyPressEvent(self, event):
        if event.key() == QtCore.Qt.Key.Key_Delete:
            self.deleteSelectedItem()
        elif event.key() == QtCore.Qt.Key.Key_Return:
            if PLATFORM == 'Darwin':
                # Activate by Enter key on macOS
                self.itemActivated.emit(self.currentItem())
            else:
                super().keyPressEvent(event)
        else:
            super().keyPressEvent(event)

    def disconnectedCallback(self):
        super().disconnectedCallback()

        self.activateItemByIndex(AS_UserActivatedItemIndex(), True)

    def connectedCallback(self):
        super().connectedCallback()

        self.activateItemByIndex(AS_UserActivatedItemIndex(), True)

    def retranslate(self):
        self.setHorizontalHeaderLabels(list(_(str(header)) for header in self.Headers))