#!/usr/bin/env python
#
# Electrum - lightweight Bitcoin client
# Copyright (C) 2012 thomasv@gitorious
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
import sys
import time
import threading
import os
import json
import weakref
import csv
from decimal import Decimal
import base64
from functools import partial
import queue
import asyncio
from typing import Optional, TYPE_CHECKING, Sequence, Union, Dict, Mapping, Callable, List, Set
import concurrent.futures
import inspect

from PyQt6.QtGui import QPixmap, QKeySequence, QIcon, QCursor, QFont, QFontMetrics, QAction, QShortcut
from PyQt6.QtCore import Qt, QRect, QStringListModel, QSize, pyqtSignal, QTimer
from PyQt6.QtWidgets import (QMessageBox, QTabWidget, QMenuBar, QFileDialog, QCheckBox, QLabel,
                             QVBoxLayout, QGridLayout, QLineEdit, QHBoxLayout, QPushButton, QScrollArea, QTextEdit,
                             QMainWindow, QInputDialog, QWidget, QSizePolicy, QStatusBar, QToolTip,
                             QMenu, QToolButton, QDialog)

import electrum_ecc as ecc

import electrum
from electrum.gui import messages
from electrum import (keystore, constants, util, bitcoin, commands,
                      lnutil)
from electrum.bitcoin import COIN, is_address, DummyAddress
from electrum.plugin import run_hook
from electrum.i18n import _
from electrum.util import (format_time, UserCancelled, profiler, bfh, InvalidPassword,
                           UserFacingException, get_new_wallet_name,
                           send_exception_to_crash_reporter,
                           AddTransactionException, os_chmod, UI_UNIT_NAME_TXSIZE_VBYTES,
                           is_valid_email, ChoiceItem, event_listener)
from electrum.bip21 import BITCOIN_BIP21_URI_SCHEME
from electrum.payment_identifier import PaymentIdentifier
from electrum.invoices import PR_PAID, Invoice
from electrum.transaction import (Transaction, PartialTxInput, TxOutput,
                                  PartialTransaction, PartialTxOutput)
from electrum.wallet import (Multisig_Wallet, Abstract_Wallet,
                             sweep_preparations, InternalAddressCorruption,
                             CannotCPFP)
from electrum.version import ELECTRUM_VERSION
from electrum.network import Network, UntrustedServerReturnedError
from electrum.exchange_rate import FxThread
from electrum.simple_config import SimpleConfig
from electrum.logging import Logger
from electrum.lntransport import extract_nodeid, ConnStringFormatError
from electrum.bolt11 import decode_bolt11_invoice, BOLT11Addr
from electrum.submarine_swaps import SwapServerTransport, NostrTransport
from electrum.fee_policy import FeePolicy

from electrum.gui.common_qt.util import TaskThread, QtEventListener, qt_event_listener

from .rate_limiter import rate_limited
from .exception_window import Exception_Hook
from .amountedit import BTCAmountEdit
from .qrcodewidget import QRDialog
from .qrtextedit import ShowQRTextEdit, ScanQRTextEdit, ScanShowQRTextEdit
from .transaction_dialog import show_transaction
from .fee_slider import FeeSlider, FeeComboBox
from .util import (read_QIcon, ColorScheme, text_dialog, icon_path, WaitingDialog,
                   WindowModalDialog, HelpLabel, Buttons,
                   OkButton, InfoButton, WWLabel, CancelButton,
                   CloseButton, MessageBoxMixin, EnterButton, import_meta_gui, export_meta_gui,
                   filename_field, address_field, char_width_in_lineedit, webopen,
                   TRANSACTION_FILE_EXTENSION_FILTER_ANY, MONOSPACE_FONT,
                   getOpenFileName, getSaveFileName, ShowQRLineEdit, scan_qr_from_screenshot)
from .wizard.wallet import WIF_HELP_TEXT
from .history_list import HistoryList, HistoryModel
from .update_checker import UpdateCheck, UpdateCheckThread
from .channels_list import ChannelsList
from .confirm_tx_dialog import ConfirmTxDialog, TxEditorContext
from .rbf_dialog import BumpFeeDialog, DSCancelDialog
from .qrreader import scan_qrcode_from_camera
from .swap_dialog import SwapDialog, InvalidSwapParameters
from .balance_dialog import (BalanceToolButton, COLOR_FROZEN, COLOR_UNMATURED, COLOR_UNCONFIRMED, COLOR_CONFIRMED,
                             COLOR_LIGHTNING, COLOR_FROZEN_LIGHTNING)

if TYPE_CHECKING:
    from . import ElectrumGui
    from electrum.submarine_swaps import SwapOffer
    from electrum.lnchannel import Channel


class StatusBarButton(QToolButton):
    # note: this class has a custom stylesheet applied in stylesheet_patcher.py
    def __init__(self, icon, tooltip, func, sb_height):
        QToolButton.__init__(self)
        self.setText('')
        self.setIcon(icon)
        self.setToolTip(tooltip)
        self.setToolButtonStyle(Qt.ToolButtonStyle.ToolButtonTextBesideIcon)
        self.setAutoRaise(True)
        size = max(25, round(0.9 * sb_height))
        self.setMaximumWidth(size)
        self.clicked.connect(self.onPress)
        self.func = func
        self.setIconSize(QSize(size, size))
        self.setCursor(QCursor(Qt.CursorShape.PointingHandCursor))

    def onPress(self, checked=False):
        '''Drops the unwanted PyQt "checked" argument'''
        self.func()

    def keyPressEvent(self, e):
        if e.key() in [Qt.Key.Key_Return, Qt.Key.Key_Enter]:
            self.func()


def protected(func):
    '''Password request wrapper.  The password is passed to the function
        as the 'password' named argument.  "None" indicates either an
        unencrypted wallet, or the user cancelled the password request.
        An empty input is passed as the empty string.'''
    def request_password(self, *args, **kwargs):
        parent = self.top_level_window()
        password = None
        msg = kwargs.get('message')
        while self._protected_requires_password():
            password = self.wallet.get_unlocked_password() or self.password_dialog(parent=parent, msg=msg)
            if password is None:
                # User cancelled password input
                return
            try:
                self.wallet.check_password(password)
                break
            except Exception as e:
                self.show_error(str(e), parent=parent)
                continue

        kwargs['password'] = password
        return func(self, *args, **kwargs)
    return request_password


class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger, QtEventListener):

    computing_privkeys_signal = pyqtSignal()
    show_privkeys_signal = pyqtSignal()
    show_error_signal = pyqtSignal(str)
    show_message_signal = pyqtSignal(str)
    labels_changed_signal = pyqtSignal()

    def __init__(self, gui_object: 'ElectrumGui', wallet: Abstract_Wallet):
        QMainWindow.__init__(self)
        self.gui_object = gui_object
        self.should_stop_wallet_on_close = True
        self.config = config = gui_object.config  # type: SimpleConfig
        self.gui_thread = gui_object.gui_thread
        assert wallet, "no wallet"
        self.wallet = wallet
        self._protected_requires_password = self.wallet.has_keystore_encryption
        if wallet.has_lightning() and not self.config.cv.GUI_QT_SHOW_TAB_CHANNELS.is_set():
            self.config.GUI_QT_SHOW_TAB_CHANNELS = True  # override default, but still allow disabling tab manually

        Exception_Hook.maybe_setup(config=self.config, wallet=self.wallet)

        self.network = gui_object.daemon.network  # type: Network
        self.fx = gui_object.daemon.fx  # type: FxThread
        self.contacts = wallet.contacts
        self.tray = gui_object.tray
        self.app = gui_object.app
        self._cleaned_up = False
        self.qr_window = None
        self.pluginsdialog = None
        self.showing_cert_mismatch_error = False
        self.tl_windows = []
        Logger.__init__(self)

        self._coroutines_scheduled = {}  # type: Dict[concurrent.futures.Future, str]
        self._coroutines_scheduled_lock = threading.Lock()
        self.thread = TaskThread(self, self.on_error)

        self.tx_notification_queue = queue.Queue()
        self.tx_notification_last_time = 0

        self.create_status_bar()
        self.need_update = threading.Event()

        self.completions = QStringListModel()

        coincontrol_sb = self.create_coincontrol_statusbar()

        self.tabs = tabs = QTabWidget(self)
        self.send_tab = self.create_send_tab()
        self.receive_tab = self.create_receive_tab()
        self.addresses_tab = self.create_addresses_tab()
        self.utxo_tab = self.create_utxo_tab()
        self.console_tab = self.create_console_tab()
        self.notes_tab = self.create_notes_tab()
        self.contacts_tab = self.create_contacts_tab()
        self.channels_tab = self.create_channels_tab()
        tabs.addTab(self.create_history_tab(), read_QIcon("tab_history.png"), _('History'))
        tabs.addTab(self.send_tab, read_QIcon("tab_send.png"), _('Send'))
        tabs.addTab(self.receive_tab, read_QIcon("tab_receive.png"), _('Receive'))

        def add_optional_tab(tabs, tab, icon, description):
            tab.tab_icon = icon
            tab.tab_description = description
            tab.tab_pos = len(tabs)
            if tab.is_shown_cv.get():
                tabs.addTab(tab, icon, description.replace("&", ""))

        add_optional_tab(tabs, self.addresses_tab, read_QIcon("tab_addresses.png"), _("&Addresses"))
        add_optional_tab(tabs, self.channels_tab, read_QIcon("lightning.png"), _("Channels"))
        add_optional_tab(tabs, self.utxo_tab, read_QIcon("tab_coins.png"), _("Co&ins"))
        add_optional_tab(tabs, self.contacts_tab, read_QIcon("tab_contacts.png"), _("Con&tacts"))
        add_optional_tab(tabs, self.console_tab, read_QIcon("tab_console.png"), _("Con&sole"))
        add_optional_tab(tabs, self.notes_tab, read_QIcon("pen.png"), _("&Notes"))

        tabs.setSizePolicy(QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Expanding)

        central_widget = QScrollArea()
        vbox = QVBoxLayout(central_widget)
        vbox.setContentsMargins(0, 0, 0, 0)
        vbox.addWidget(tabs)
        vbox.addWidget(coincontrol_sb)

        self.setCentralWidget(central_widget)

        self.setMinimumWidth(640)
        self.setMinimumHeight(400)
        if self.config.GUI_QT_WINDOW_IS_MAXIMIZED:
            self.showMaximized()

        self.setWindowIcon(read_QIcon("electrum.png"))
        self.init_menubar()

        wrtabs = weakref.proxy(tabs)
        QShortcut(QKeySequence("Ctrl+W"), self, self.close)
        QShortcut(QKeySequence("Ctrl+Q"), self, self.close)
        QShortcut(QKeySequence("Ctrl+R"), self, self.update_wallet)
        QShortcut(QKeySequence("F5"), self, self.update_wallet)
        QShortcut(QKeySequence("Ctrl+PgUp"), self, lambda: wrtabs.setCurrentIndex((wrtabs.currentIndex() - 1)%wrtabs.count()))
        QShortcut(QKeySequence("Ctrl+PgDown"), self, lambda: wrtabs.setCurrentIndex((wrtabs.currentIndex() + 1)%wrtabs.count()))

        for i in range(wrtabs.count()):
            QShortcut(QKeySequence("Alt+" + str(i + 1)), self, lambda i=i: wrtabs.setCurrentIndex(i))

        self.app.refresh_tabs_signal.connect(self.refresh_tabs)
        self.app.refresh_amount_edits_signal.connect(self.refresh_amount_edits)
        self.app.update_status_signal.connect(self.update_status)
        self.app.update_fiat_signal.connect(self.update_fiat)

        self.show_error_signal.connect(self.show_error)
        self.show_message_signal.connect(self.show_message)
        self.history_list.setFocus()

        # network callbacks
        self.register_callbacks()
        # wallet closing warning callbacks
        self.closing_warning_callbacks = []  # type: List[Callable[[], Optional[str]]]
        self.register_closing_warning_callback(self._check_ongoing_submarine_swaps_callback)
        self.register_closing_warning_callback(self._check_ongoing_force_closures)
        # banner may already be there
        if self.network and self.network.banner:
            self.console.showMessage(self.network.banner)

        # update fee slider in case we missed the callback
        #self.fee_slider.update()
        self.load_wallet(wallet)

        self.timer = QTimer(self)
        self.timer.setInterval(500)
        self.timer.setSingleShot(False)
        self.timer.timeout.connect(self.timer_actions)
        self.timer.start()

        self.contacts.fetch_openalias(self.config)

        # If the option hasn't been set yet
        if not config.cv.AUTOMATIC_CENTRALIZED_UPDATE_CHECKS.is_set():
            choice = self.question(title="Electrum - " + _("Enable update check"),
                                   msg=_("For security reasons we advise that you always use the latest version of Electrum.") + " " +
                                       _("Would you like to be notified when there is a newer version of Electrum available?"))
            config.AUTOMATIC_CENTRALIZED_UPDATE_CHECKS = bool(choice)

        self._update_check_thread = None
        if config.AUTOMATIC_CENTRALIZED_UPDATE_CHECKS:
            # The references to both the thread and the window need to be stored somewhere
            # to prevent GC from getting in our way.
            def on_version_received(v):
                if UpdateCheck.is_newer(v):
                    self.update_check_button.setText(_("Update to Electrum {} is available").format(v))
                    self.update_check_button.clicked.connect(lambda: self.show_update_check(v))
                    self.update_check_button.show()
            self._update_check_thread = UpdateCheckThread()
            self._update_check_thread.checked.connect(on_version_received)
            self._update_check_thread.start()

    def run_coroutine_dialog(self, coro, text):
        """ run coroutine in a waiting dialog, with a Cancel button that cancels the coroutine"""
        from .util import RunCoroutineDialog
        d = RunCoroutineDialog(self, text, coro)
        return d.run()

    def run_coroutine_from_thread(self, coro, name, on_result=None):
        if self._cleaned_up:
            self.logger.warning(f"stopping or already stopped but run_coroutine_from_thread was called.")
            return
        async def wrapper():
            try:
                res = await coro
            except Exception as e:
                self.logger.exception("exception in coro scheduled via window.wallet")
                self.show_error_signal.emit(repr(e))
            else:
                if on_result:
                    on_result(res)
            finally:
                with self._coroutines_scheduled_lock:
                    self._coroutines_scheduled.pop(fut)
                self.need_update.set()

        fut = asyncio.run_coroutine_threadsafe(wrapper(), self.network.asyncio_loop)
        with self._coroutines_scheduled_lock:
            self._coroutines_scheduled[fut] = name
        self.need_update.set()

    def toggle_lock(self):
        if self.wallet.get_unlocked_password():
            self.lock_wallet()
        else:
            msg = ' '.join([
                _('Your wallet is locked.'),
                _('If you unlock it, its password will not be required to sign transactions.'),
                _('Enter your password to unlock your wallet:')
            ])
            self.unlock_wallet(message=msg)

    def update_lock_menu(self):
        self.lock_menu.setEnabled(self._protected_requires_password())
        text = _('Lock') if self.wallet.get_unlocked_password() else _('Unlock')
        self.lock_menu.setText(text)

    @protected
    def unlock_wallet(self, password, message=None):
        self.wallet.unlock(password)
        self.update_lock_icon()
        self.update_lock_menu()
        self.wallet.txbatcher.set_password_future(password)
        icon = read_QIcon("unlock.png")
        msg = ' '.join([
            _('Your wallet is unlocked.'),
            _('Its password will not be required to sign transactions.'),
        ])
        self.show_message(msg, icon=icon.pixmap(30))

    def lock_wallet(self):
        self.wallet.lock_wallet()
        self.update_lock_icon()
        self.update_lock_menu()
        icon = read_QIcon("lock.png")
        msg = ' '.join([
            _('Your wallet is locked.'),
            _('Its password will be required to sign transactions.'),
        ])
        self.show_message(msg, icon=icon.pixmap(30))

    def on_fx_history(self):
        self.history_model.refresh('fx_history')
        self.address_list.refresh_all()

    def on_fx_quotes(self):
        self.update_status()
        # Refresh edits with the new rate
        edit = self.send_tab.fiat_send_e if self.send_tab.fiat_send_e.is_last_edited else self.send_tab.amount_e
        edit.textEdited.emit(edit.text())
        edit = self.receive_tab.fiat_receive_e if self.receive_tab.fiat_receive_e.is_last_edited else self.receive_tab.receive_amount_e
        edit.textEdited.emit(edit.text())
        # History tab needs updating if it used spot
        if self.fx.history_used_spot:
            self.history_model.refresh('fx_quotes')
        self.address_list.refresh_all()

    def toggle_tab(self, tab):
        show = not tab.is_shown_cv.get()
        tab.is_shown_cv.set(show)
        if show:
            # Find out where to place the tab
            index = len(self.tabs)
            for i in range(len(self.tabs)):
                try:
                    if tab.tab_pos < self.tabs.widget(i).tab_pos:
                        index = i
                        break
                except AttributeError:
                    pass
            self.tabs.insertTab(index, tab, tab.tab_icon, tab.tab_description.replace("&", ""))
        else:
            i = self.tabs.indexOf(tab)
            self.tabs.removeTab(i)

    def push_top_level_window(self, window):
        '''Used for e.g. tx dialog box to ensure new dialogs are appropriately
        parented.  This used to be done by explicitly providing the parent
        window, but that isn't something hardware wallet prompts know.'''
        self.tl_windows.append(window)

    def pop_top_level_window(self, window):
        self.tl_windows.remove(window)

    def top_level_window(self, test_func=None):
        '''Do the right thing in the presence of tx dialog windows'''
        override = self.tl_windows[-1] if self.tl_windows else None
        if override and test_func and not test_func(override):
            override = None  # only override if ok for test_func
        return self.top_level_window_recurse(override, test_func)

    def diagnostic_name(self):
        #return '{}:{}'.format(self.__class__.__name__, self.wallet.diagnostic_name())
        return self.wallet.diagnostic_name()

    def is_hidden(self):
        return self.isMinimized() or self.isHidden()

    def show_or_hide(self):
        if self.is_hidden():
            self.bring_to_top()
        else:
            self.hide()

    def bring_to_top(self):
        self.show()
        self.raise_()

    def on_error(self, exc_info):
        e = exc_info[1]
        if isinstance(e, (UserCancelled, concurrent.futures.CancelledError)):
            pass
        elif isinstance(e, UserFacingException):
            self.show_error(str(e))
        else:
            # TODO would be nice if we just sent these to the crash reporter...
            #      anything we don't want to send there, we should explicitly catch
            # send_exception_to_crash_reporter(e)
            try:
                self.logger.error("on_error", exc_info=exc_info)
            except OSError:
                pass  # see #4418
            self.show_error(repr(e))

    @event_listener
    def on_event_wallet_updated(self, wallet):
        if wallet == self.wallet:
            self.need_update.set()

    @event_listener
    def on_event_new_transaction(self, wallet: Abstract_Wallet, tx: Transaction):
        if wallet == self.wallet:
            self.tx_notification_queue.put(tx)
            self.need_update.set()

    @qt_event_listener
    def on_event_password_required(self, wallet):
        if wallet == self.wallet:
            self.password_required_button.show()

    @qt_event_listener
    def on_event_password_not_required(self, wallet):
        if wallet == self.wallet:
            self.password_required_button.hide()

    def on_password_required_button_clicked(self):
        if self.wallet.txbatcher.password_future is None:
            return
        txids = self.wallet.txbatcher.password_future.txids
        labels = [ ' - %s ' % (self.wallet.get_label_for_txid(txid) or (txid[0:15] + '...')) for txid in txids ]
        message = _('Your password is needed to sign the following transactions:') + '\n' + '\n'.join(labels)
        password = self.get_password(message=message)
        if password:
            self.wallet.txbatcher.set_password_future(password)

    @qt_event_listener
    def on_event_status(self):
        self.update_status()

    @qt_event_listener
    def on_event_network_updated(self, *args):
        self.update_status()

    @qt_event_listener
    def on_event_blockchain_updated(self, *args):
        # update the number of confirmations in history
        self.refresh_tabs()

    @qt_event_listener
    def on_event_on_quotes(self, *args):
        self.on_fx_quotes()

    @qt_event_listener
    def on_event_on_history(self, *args):
        self.on_fx_history()

    @qt_event_listener
    def on_event_gossip_db_loaded(self, *args):
        self.channels_list.gossip_db_loaded.emit(*args)

    @qt_event_listener
    def on_event_channels_updated(self, *args):
        wallet = args[0]
        if wallet == self.wallet:
            self.channels_list.update_rows.emit(*args)

    @qt_event_listener
    def on_event_channel(self, *args):
        wallet = args[0]
        if wallet == self.wallet:
            self.channels_list.update_single_row.emit(*args)
            self.update_status()

    @qt_event_listener
    def on_event_banner(self, *args):
        self.console.showMessage(args[0])

    @qt_event_listener
    def on_event_adb_set_future_tx(self, adb, txid):
        if adb == self.wallet.adb:
            self.history_model.refresh('set_future_tx')
            self.utxo_list.refresh_all()  # for coin frozen status
            self.update_status()  # frozen balance

    @qt_event_listener
    def on_event_verified(self, *args):
        wallet, tx_hash, tx_mined_status = args
        if wallet == self.wallet:
            self.history_model.update_tx_mined_status(tx_hash, tx_mined_status)

    @qt_event_listener
    def on_event_fee_histogram(self, *args):
        self.history_model.on_fee_histogram()

    @qt_event_listener
    def on_event_ln_gossip_sync_progress(self, *args):
        self.update_lightning_icon()

    @qt_event_listener
    def on_event_cert_mismatch(self, *args):
        self.show_cert_mismatch_error()

    @qt_event_listener
    def on_event_tor_probed(self, is_tor):
        self.tor_button.setVisible(is_tor)

    @qt_event_listener
    def on_event_proxy_set(self, *args):
        self.tor_button.setVisible(False)

    @qt_event_listener
    def on_event_recently_opened_wallets_update(self, *args):
        self.update_recently_opened_menu()

    def close_wallet(self):
        if self.wallet:
            self.logger.info(f'close_wallet {self.wallet.storage.get_path()}')
        run_hook('close_wallet', self.wallet)

    @profiler
    def load_wallet(self, wallet: Abstract_Wallet):
        self.update_recently_opened_menu()
        if wallet.has_lightning():
            util.trigger_callback('channels_updated', wallet)
        self.need_update.set()
        # Once GUI has been initialized check if we want to announce something since the callback has been called before the GUI was initialized
        # update menus
        self.seed_menu.setEnabled(self.wallet.has_seed())
        self.update_lock_icon()
        self.update_buttons_on_seed()
        self.update_console()
        self.receive_tab.do_clear()
        self.receive_tab.request_list.update()
        self.channels_list.update()
        self.tabs.show()
        self.init_geometry()
        if self.config.GUI_QT_HIDE_ON_STARTUP and self.gui_object.tray.isVisible():
            self.hide()
        else:
            self.show()
        self.watching_only_changed()
        run_hook('load_wallet', wallet, self)
        try:
            wallet.try_detecting_internal_addresses_corruption()
        except InternalAddressCorruption as e:
            self.show_error(str(e))
            send_exception_to_crash_reporter(e)

    def init_geometry(self):
        # note: does not support multiple monitors well
        winpos = self.wallet.db.get("winpos-qt")
        try:
            winrect = QRect(*winpos)
        except TypeError:
            winrect = None
        screen = self.app.primaryScreen().geometry()
        if winrect and screen.contains(winrect):
            self.setGeometry(winrect)
        else:
            self.logger.info("using default geometry")
            self.setGeometry(100, 100, 840, 400)

    @classmethod
    def get_app_name_and_version_str(cls) -> str:
        name = "Electrum"
        if constants.net.TESTNET:
            name += " " + constants.net.NET_NAME.capitalize()
        return f"{name} {ELECTRUM_VERSION}"

    def watching_only_changed(self):
        name_and_version = self.get_app_name_and_version_str()
        title = f"{name_and_version}  -  {self.wallet.basename()}"
        extra = [self.wallet.db.get('wallet_type', '?')]
        if self.wallet.is_watching_only():
            extra.append(_('watching only'))
        title += '  [%s]'% ', '.join(extra)
        self.setWindowTitle(title)
        self.password_menu.setEnabled(self.wallet.may_have_password())
        self.import_privkey_menu.setVisible(self.wallet.can_import_privkey())
        self.import_address_menu.setVisible(self.wallet.can_import_address())
        self.export_menu.setEnabled(self.wallet.can_export())

    def warn_if_watching_only(self):
        if self.wallet.is_watching_only():
            msg = ' '.join([
                _("This wallet is watching-only."),
                _("This means you will not be able to spend Bitcoins with it."),
                _("Make sure you own the seed phrase or the private keys, before you request Bitcoins to be sent to this wallet.")
            ])
            self.show_warning(msg, title=_('Watch-only wallet'))

    def warn_if_testnet(self):
        if not constants.net.TESTNET:
            return
        # user might have opted out already
        if self.config.DONT_SHOW_TESTNET_WARNING:
            return
        # only show once per process lifecycle
        if getattr(self.gui_object, '_warned_testnet', False):
            return
        self.gui_object._warned_testnet = True
        msg = ''.join([
            _("You are in testnet mode."), ' ',
            _("Testnet coins are worthless."), '\n',
            _("Testnet is separate from the main Bitcoin network. It is used for testing.")
        ])
        cb = QCheckBox(_("Don't show this again."))
        cb_checked = False
        def on_cb(_x):
            nonlocal cb_checked
            cb_checked = cb.isChecked()
        cb.stateChanged.connect(on_cb)
        self.show_warning(msg, title=_('Testnet'), checkbox=cb)
        if cb_checked:
            self.config.DONT_SHOW_TESTNET_WARNING = True

    def open_wallet(self):
        try:
            wallet_folder = self.get_wallet_folder()
        except FileNotFoundError as e:
            self.show_error(str(e))
            return
        filename, __ = QFileDialog.getOpenFileName(self, "Select your wallet file", wallet_folder)
        if not filename:
            return
        self.gui_object.new_window(filename)

    def select_backup_dir(self, b):
        name = self.config.WALLET_BACKUP_DIRECTORY or ""
        dirname = QFileDialog.getExistingDirectory(self, "Select your wallet backup directory", name)
        if dirname:
            self.config.WALLET_BACKUP_DIRECTORY = dirname
            self.backup_dir_e.setText(dirname)

    def backup_wallet(self):
        d = WindowModalDialog(self, _("File Backup"))
        vbox = QVBoxLayout(d)
        grid = QGridLayout()
        backup_help = ""
        backup_dir = self.config.WALLET_BACKUP_DIRECTORY
        backup_dir_label = HelpLabel(_('Backup directory') + ':', backup_help)
        msg = _('Please select a backup directory')
        if self.wallet.has_lightning() and self.wallet.lnworker.channels:
            msg += '\n\n' + ' '.join([
                _("Note that lightning channels will be converted to channel backups."),
                _("You cannot use channel backups to perform lightning payments."),
                _("Channel backups can only be used to request your channels to be closed.")
            ])
        self.backup_dir_e = QPushButton(backup_dir)
        self.backup_dir_e.clicked.connect(self.select_backup_dir)
        grid.addWidget(backup_dir_label, 1, 0)
        grid.addWidget(self.backup_dir_e, 1, 1)
        vbox.addLayout(grid)
        vbox.addWidget(WWLabel(msg))
        vbox.addLayout(Buttons(CancelButton(d), OkButton(d)))
        if not d.exec():
            return False
        backup_dir = self.config.get_backup_dir()
        if backup_dir is None:
            self.show_message(_("You need to configure a backup directory in your preferences"), title=_("Backup not configured"))
            return
        try:
            new_path = self.wallet.save_backup(backup_dir)
        except BaseException as reason:
            self.show_critical(_("Electrum was unable to copy your wallet file to the specified location.") + "\n" + str(reason), title=_("Unable to create backup"))
            return
        msg = _("A copy of your wallet file was created in")+" '%s'" % str(new_path)
        self.show_message(msg, title=_("Wallet backup created"))
        return True

    def update_recently_opened_menu(self):
        recent = self.config.RECENTLY_OPEN_WALLET_FILES or []
        self.recently_visited_menu.clear()
        for i, k in enumerate(recent):
            b = os.path.basename(k)

            def loader(k):
                return lambda: self.gui_object.new_window(k)
            self.recently_visited_menu.addAction(b, loader(k)).setShortcut(QKeySequence("Ctrl+%d" % (i+1)))
        self.recently_visited_menu.setEnabled(bool(len(recent)))

    def get_wallet_folder(self):
        return os.path.abspath(self.config.get_datadir_wallet_path())

    def new_wallet(self):
        try:
            wallet_folder = self.get_wallet_folder()
        except FileNotFoundError as e:
            self.show_error(str(e))
            return
        try:
            filename = get_new_wallet_name(wallet_folder)
        except OSError as e:
            self.logger.exception("")
            self.show_error(repr(e))
            path = self.config.get_fallback_wallet_path()
        else:
            path = os.path.join(wallet_folder, filename)
        self.gui_object.start_new_window(path, uri=None, force_wizard=True)

    def init_menubar(self):
        menubar = QMenuBar()

        self.file_menu = menubar.addMenu(_("&File"))
        self.recently_visited_menu = self.file_menu.addMenu(_("&Recently open"))
        self.file_menu.addAction(_("&Open"), self.open_wallet).setShortcut(QKeySequence.StandardKey.Open)
        self.file_menu.addAction(_("&New/Restore"), self.new_wallet).setShortcut(QKeySequence.StandardKey.New)
        self.file_menu.addAction(_("&Save backup"), self.backup_wallet).setShortcut(QKeySequence.StandardKey.SaveAs)
        self.file_menu.addAction(_("Delete"), self.remove_wallet)
        self.file_menu.addSeparator()
        self.file_menu.addAction(_("&Quit"), self.close)

        self.wallet_menu = menubar.addMenu(_("&Wallet"))
        self.wallet_menu.addAction(_("&Information"), self.show_wallet_info)
        self.wallet_menu.addSeparator()

        self.password_menu = self.wallet_menu.addAction(_("&Password"), self.change_password_dialog)
        self.lock_menu = self.wallet_menu.addAction(_("&Unlock"), self.toggle_lock)
        self.update_lock_menu()
        self.seed_menu = self.wallet_menu.addAction(_("&Seed"), self.show_seed_dialog)
        self.private_keys_menu = self.wallet_menu.addMenu(_("&Private keys"))
        self.private_keys_menu.addAction(_("&Sweep"), self.sweep_key_dialog)
        self.import_privkey_menu = self.private_keys_menu.addAction(_("&Import"), self.do_import_privkey)
        self.export_menu = self.private_keys_menu.addAction(_("&Export"), self.export_privkeys_dialog)
        self.import_address_menu = self.wallet_menu.addAction(_("Import addresses"), self.import_addresses)

        self.labels_menu = self.wallet_menu.addMenu(_("&Labels"))
        self.labels_menu.addAction(_("&Import"), self.do_import_labels)
        self.labels_menu.addAction(_("&Export"), self.do_export_labels)

        self.wallet_menu.addAction(_("Find"), self.toggle_search).setShortcut(QKeySequence("Ctrl+F"))
        self.wallet_menu.addSeparator()

        def add_toggle_action(tab):
            is_shown = tab.is_shown_cv.get()
            tab.menu_action = self.view_menu.addAction(tab.tab_description, lambda: self.toggle_tab(tab))
            tab.menu_action.setCheckable(True)
            tab.menu_action.setChecked(is_shown)
        self.view_menu = menubar.addMenu(_("&View"))
        add_toggle_action(self.addresses_tab)
        add_toggle_action(self.utxo_tab)
        add_toggle_action(self.channels_tab)
        add_toggle_action(self.contacts_tab)
        add_toggle_action(self.console_tab)
        add_toggle_action(self.notes_tab)

        self.tools_menu = menubar.addMenu(_("&Tools"))  # type: QMenu
        preferences_action = self.tools_menu.addAction(_("Preferences"), self.settings_dialog)  # type: QAction
        if sys.platform == 'darwin':
            # "Settings"/"Preferences" are all reserved keywords in macOS.
            # preferences_action will get picked up based on name (and put into a standardized location,
            # and given a standard reserved hotkey)
            # Hence, this menu item will be at a "uniform location re macOS processes"
            preferences_action.setMenuRole(QAction.MenuRole.PreferencesRole)  # make sure OS recognizes it as preferences
            # Add another preferences item, to also have a "uniform location for Electrum between different OSes"
            self.tools_menu.addAction(_("Electrum preferences"), self.settings_dialog)

        self.tools_menu.addAction(_("&Network"), self.gui_object.show_network_dialog).setEnabled(bool(self.network))
        self.tools_menu.addAction(_("&Plugins"), self.gui_object.show_plugins_dialog)
        self.tools_menu.addSeparator()
        self.tools_menu.addAction(_("&Sign/verify message"), self.sign_verify_message)
        self.tools_menu.addAction(_("&Encrypt/decrypt message"), self.encrypt_message)
        self.tools_menu.addSeparator()

        raw_transaction_menu = self.tools_menu.addMenu(_("&Load transaction"))
        raw_transaction_menu.addAction(_("&From file"), self.do_process_from_file)
        raw_transaction_menu.addAction(_("&From text"), self.do_process_from_text)
        raw_transaction_menu.addAction(_("&From the blockchain"), self.do_process_from_txid)
        raw_transaction_menu.addAction(_("&From QR code"), self.read_tx_from_qrcode)
        self.raw_transaction_menu = raw_transaction_menu

        self.help_menu = menubar.addMenu(_("&Help"))
        if sys.platform != 'darwin':
            self.help_menu.addAction(_("&About"), self.show_about)
        else:
            # macOS reserves the "About" menu item name, similarly to "Preferences" (see above).
            # The "About" keyword seems even more strictly locked down:
            # not allowed as either a prefix or a suffix.
            about_action = QAction(self)
            about_action.triggered.connect(self.show_about)
            about_action.setMenuRole(QAction.MenuRole.AboutRole)  # make sure OS recognizes it as "About"
            self.help_menu.addAction(about_action)
        self.help_menu.addAction(_("&Changelog"), lambda: webopen(constants.RELEASE_NOTES_URL))
        self.help_menu.addAction(_("&Check for updates"), self.show_update_check)
        self.help_menu.addAction(_("&Official website"), lambda: webopen("https://electrum.org"))
        self.help_menu.addSeparator()
        self.help_menu.addAction(_("&Documentation"), lambda: webopen("http://docs.electrum.org/")).setShortcut(QKeySequence.StandardKey.HelpContents)
        if not constants.net.TESTNET:
            self.help_menu.addAction(_("&Bitcoin Paper"), self.show_bitcoin_paper)
        self.help_menu.addAction(_("&Report Bug"), self.show_report_bug)
        self.help_menu.addSeparator()
        if self.network:
            self.help_menu.addAction(_("&Donate to server"), self.donate_to_server)

        run_hook('init_menubar', self)
        self.setMenuBar(menubar)

    def donate_to_server(self):
        d = self.network.get_donation_address()
        if d:
            self.show_send_tab()
            host = self.network.get_parameters().server.host
            self.handle_payment_identifier('bitcoin:%s?message=donation for %s' % (d, host))
        else:
            self.show_error(_('No donation address for this server'))

    def show_about(self):
        QMessageBox.about(self, "Electrum",
                          (_("Version")+" %s" % ELECTRUM_VERSION + "\n\n" +
                           _("Electrum's focus is speed, with low resource usage and simplifying Bitcoin.") + " " +
                           _("You do not need to perform regular backups, because your wallet can be "
                              "recovered from a secret phrase that you can memorize or write on paper.") + " " +
                           _("Startup times are instant because it operates in conjunction with high-performance "
                              "servers that handle the most complicated parts of the Bitcoin system.") + "\n\n" +
                           _("Uses icons from the Icons8 icon pack (icons8.com).")))

    def show_bitcoin_paper(self):
        filename = os.path.join(self.config.path, 'bitcoin.pdf')
        if not os.path.exists(filename):
            def fetch_bitcoin_paper():
                s = self._fetch_tx_from_network("54e48e5f5c656b26c3bca14a8c95aa583d07ebe84dde3b7dd4a78f4e4186e713")
                if not s:
                    raise concurrent.futures.CancelledError
                s = s.split("0100000000000000")[1:-1]
                out = ''.join(x[6:136] + x[138:268] + x[270:400] if len(x) > 136 else x[6:] for x in s)[16:-20]
                with open(filename, 'wb') as f:
                    f.write(bytes.fromhex(out))
            WaitingDialog(
                self,
                _("Fetching Bitcoin Paper..."),
                fetch_bitcoin_paper,
                on_success=lambda _: webopen('file:///' + filename),
                on_error=self.on_error,
            )
            return
        webopen('file:///' + filename)

    def show_update_check(self, version=None):
        self.gui_object._update_check = UpdateCheck(latest_version=version)

    def show_report_bug(self):
        msg = ' '.join([
            _("Please report any bugs as issues on github:<br/>"),
            f'''<a href="{constants.GIT_REPO_ISSUES_URL}">{constants.GIT_REPO_ISSUES_URL}</a><br/><br/>''',
            _("Before reporting a bug, upgrade to the most recent version of Electrum (latest release or git HEAD), and include the version number in your report."),
            _("Try to explain not only what the bug is, but how it occurs.")
         ])
        self.show_message(msg, title="Electrum - " + _("Reporting Bugs"), rich_text=True)

    def notify_transactions(self):
        if self.tx_notification_queue.qsize() == 0:
            return
        if not self.wallet.is_up_to_date():
            return  # no notifications while syncing
        now = time.time()
        rate_limit = 20  # seconds
        if self.tx_notification_last_time + rate_limit > now:
            return
        self.tx_notification_last_time = now
        self.logger.info("Notifying GUI about new transactions")
        txns = []
        while True:
            try:
                txns.append(self.tx_notification_queue.get_nowait())
            except queue.Empty:
                break

        for notification in self.wallet.get_user_notifications_for_new_txns(txns):
            self.notify(notification)

    def notify(self, message):
        if self.tray:
            self.tray.showMessage("Electrum", message, read_QIcon("electrum_dark_icon"), 20000)

    def timer_actions(self):
        # refresh invoices and requests because they show ETA
        self.receive_tab.request_list.refresh_all()
        self.send_tab.invoice_list.refresh_all()
        # Note this runs in the GUI thread
        if self.need_update.is_set():
            self.need_update.clear()
            self.update_wallet()
        elif not self.wallet.is_up_to_date():
            # this updates "synchronizing" progress
            self.update_status()
        # resolve aliases
        # FIXME this might do blocking network calls that has a timeout of several seconds
        # self.send_tab.payto_e.on_timer_check_text()
        self.notify_transactions()

    def format_amount(
        self,
        amount_sat,
        is_diff=False,
        whitespaces=False,
        *,
        add_thousands_sep: bool = None,
    ) -> str:
        """Formats amount as string, converting to desired unit.
        E.g. 500_000 -> '0.005'
        """
        return self.config.format_amount(
            amount_sat,
            is_diff=is_diff,
            whitespaces=whitespaces,
            add_thousands_sep=add_thousands_sep,
        )

    def format_amount_and_units(self, amount_sat, *, timestamp: int = None) -> str:
        """Returns string with both bitcoin and fiat amounts, in desired units.
        E.g. 500_000 -> '0.005 BTC (191.42 EUR)'
        """
        text = self.config.format_amount_and_units(amount_sat)
        fiat = self.fx.format_amount_and_units(amount_sat, timestamp=timestamp) if self.fx else None
        if text and fiat:
            text += f' ({fiat})'
        return text

    def format_fiat_and_units(self, amount_sat) -> str:
        """Returns string of FX fiat amount, in desired units.
        E.g. 500_000 -> '191.42 EUR'
        """
        return self.fx.format_amount_and_units(amount_sat) if self.fx else ''

    def format_fee_rate(self, fee_rate) -> str:
        """fee_rate is in sat/kvByte."""
        return self.config.format_fee_rate(fee_rate)

    def get_decimal_point(self):
        return self.config.BTC_AMOUNTS_DECIMAL_POINT

    def base_unit(self):
        return self.config.get_base_unit()

    def connect_fields(self, btc_e, fiat_e):

        def edit_changed(edit):
            if edit.follows:
                return
            edit.setStyleSheet(ColorScheme.DEFAULT.as_stylesheet())
            fiat_e.is_last_edited = (edit == fiat_e)
            amount = edit.get_amount()
            rate = self.fx.exchange_rate() if self.fx else Decimal('NaN')
            if rate.is_nan() or amount is None:
                if edit is fiat_e:
                    btc_e.setText("")
                else:
                    fiat_e.setText("")
            else:
                if edit is fiat_e:
                    btc_e.follows = True
                    btc_e.setAmount(int(amount / Decimal(rate) * COIN))
                    btc_e.setStyleSheet(ColorScheme.BLUE.as_stylesheet())
                    btc_e.follows = False
                else:
                    fiat_e.follows = True
                    fiat_e.setText(self.fx.ccy_amount_str(
                        amount * Decimal(rate) / COIN, add_thousands_sep=False))
                    fiat_e.setStyleSheet(ColorScheme.BLUE.as_stylesheet())
                    fiat_e.follows = False

        btc_e.follows = False
        fiat_e.follows = False
        fiat_e.textChanged.connect(partial(edit_changed, fiat_e))
        btc_e.textChanged.connect(partial(edit_changed, btc_e))
        fiat_e.is_last_edited = False

    def update_status(self):
        if not self.wallet:
            return

        network_text = ""
        balance_text = ""

        if self.tor_button:
            self.tor_button.setVisible(self.network and bool(self.network.is_proxy_tor))

        if self.network is None:
            network_text = _("Offline")
            icon = read_QIcon("status_disconnected.png")

        elif self.network.is_connected():
            server_height = self.network.get_server_height()
            server_lag = self.network.get_local_height() - server_height
            fork_str = "_fork" if len(self.network.get_blockchains())>1 else ""
            # Server height can be 0 after switching to a new server
            # until we get a headers subscription request response.
            # Display the synchronizing message in that case.
            if not self.wallet.is_up_to_date() or server_height == 0:
                num_sent, num_answered = self.wallet.adb.get_history_sync_state_details()
                network_text = ("{} ({}/{})"
                                .format(_("Synchronizing..."), num_answered, num_sent))
                icon = read_QIcon("status_waiting.png")
            elif server_lag > 1:
                network_text = _("Server is lagging ({} blocks)").format(server_lag)
                icon = read_QIcon("status_lagging%s.png"%fork_str)
            else:
                network_text = _("Connected")
                p_bal = self.wallet.get_balances_for_piechart()
                self.balance_label.update_list(
                    [
                        (_('Frozen'), COLOR_FROZEN, p_bal.frozen),
                        (_('Unmatured'), COLOR_UNMATURED, p_bal.unmatured),
                        (_('Unconfirmed'), COLOR_UNCONFIRMED, p_bal.unconfirmed),
                        (_('On-chain'), COLOR_CONFIRMED, p_bal.confirmed),
                        (_('Lightning'), COLOR_LIGHTNING, p_bal.lightning),
                        (_('Lightning frozen'), COLOR_FROZEN_LIGHTNING, p_bal.lightning_frozen),
                    ],
                    warning = self.wallet.is_low_reserve(),
                )
                balance = p_bal.total()
                balance_text =  _("Balance") + ": %s "%(self.format_amount_and_units(balance))
                # append fiat balance and price
                if self.fx.is_enabled():
                    balance_text += self.fx.get_fiat_status_text(balance,
                        self.base_unit(), self.get_decimal_point()) or ''
                if not self.network.proxy or not self.network.proxy.enabled:
                    icon = read_QIcon("status_connected%s.png"%fork_str)
                else:
                    icon = read_QIcon("status_connected_proxy%s.png"%fork_str)
        else:
            if self.network.proxy and self.network.proxy.enabled:
                network_text = "{} ({})".format(_("Not connected"), _("proxy enabled"))
            else:
                network_text = _("Not connected")
            icon = read_QIcon("status_disconnected.png")

        if self.tray:
            # note: don't include balance in systray tooltip, as some OSes persist tooltips,
            #       hence "leaking" the wallet balance (see #5665)
            name_and_version = self.get_app_name_and_version_str()
            self.tray.setToolTip(f"{name_and_version} ({network_text})")
        self.balance_label.setText(balance_text or network_text)
        if self.status_button:
            self.status_button.setIcon(icon)

        num_tasks = self.num_tasks()
        if num_tasks == 0:
            name = ''
        elif num_tasks == 1:
            with self._coroutines_scheduled_lock:
                name = list(self._coroutines_scheduled.values())[0] + '...'
        else:
            name = f"{num_tasks} " + _('tasks') + '...'
        self.tasks_label.setText(name)
        self.tasks_label.setVisible(num_tasks > 0)

    def num_tasks(self):
        # For the moment, all the coroutines in this set are outgoing LN payments,
        # so we can use this to disable buttons for rebalance/swap suggestions
        return len(self._coroutines_scheduled)

    def update_wallet(self):
        self.update_status()
        if self.wallet.is_up_to_date() or not self.network or not self.network.is_connected():
            self.update_tabs()

    def update_tabs(self, wallet=None):
        if wallet is None:
            wallet = self.wallet
        if wallet != self.wallet:
            return
        self.history_model.refresh('update_tabs')
        self.receive_tab.request_list.update()
        self.receive_tab.update_current_request()
        self.send_tab.invoice_list.update()
        self.address_list.update()
        self.utxo_list.update()
        self.contact_list.update()
        self.channels_list.update_rows.emit(wallet)
        self.update_completions()

    def refresh_tabs(self, wallet=None):
        self.history_model.refresh('refresh_tabs')
        self.receive_tab.request_list.refresh_all()
        self.send_tab.invoice_list.refresh_all()
        self.address_list.refresh_all()
        self.utxo_list.refresh_all()
        self.contact_list.refresh_all()
        self.channels_list.update_rows.emit(self.wallet)

    def create_channels_tab(self):
        self.channels_list = ChannelsList(self)
        tab = self.create_list_tab(self.channels_list)
        tab.is_shown_cv = self.config.cv.GUI_QT_SHOW_TAB_CHANNELS
        return tab

    def create_history_tab(self):
        self.history_model = HistoryModel(self)
        self.history_list = l = HistoryList(self, self.history_model)
        self.history_model.set_view(self.history_list)
        l.searchable_list = l
        tab = self.create_list_tab(self.history_list)
        return tab

    def show_address(self, addr: str, *, parent: QWidget = None):
        from . import address_dialog
        d = address_dialog.AddressDialog(self, addr, parent=parent)
        d.exec()

    def show_utxo(self, utxo):
        from . import utxo_dialog
        d = utxo_dialog.UTXODialog(self, utxo)
        d.exec()

    def show_channel_details(self, chan):
        from .channel_details import ChannelDetailsDialog
        ChannelDetailsDialog(self, chan).show()

    def show_transaction(
        self,
        tx: Transaction,
        *,
        prompt_if_complete_unsaved: bool = True,
        external_keypairs: Mapping[bytes, bytes] = None,
        invoice: Invoice = None,
        on_closed: Callable[[Optional[Transaction]], None] = None,
        show_sign_button: bool = True,
        show_broadcast_button: bool = True,
    ):
        show_transaction(
            tx,
            parent=self,
            prompt_if_complete_unsaved=prompt_if_complete_unsaved,
            external_keypairs=external_keypairs,
            invoice=invoice,
            on_closed=on_closed,
            show_sign_button=show_sign_button,
            show_broadcast_button=show_broadcast_button,
        )

    def show_lightning_transaction(self, tx_item):
        from .lightning_tx_dialog import LightningTxDialog
        d = LightningTxDialog(self, tx_item)
        d.show()

    def create_receive_tab(self):
        from .receive_tab import ReceiveTab
        return ReceiveTab(self)

    def do_copy(self, text: str, *, title: str = None) -> None:
        self.gui_object.do_copy(text, title=title)

    def show_tooltip_after_delay(self, message):
        # tooltip cannot be displayed immediately when called from a menu; wait 200ms
        QTimer.singleShot(200, lambda: QToolTip.showText(QCursor.pos(), message, self))

    def toggle_qr_window(self):
        from . import qrwindow
        if not self.qr_window:
            self.qr_window = qrwindow.QR_Window(self)
            self.qr_window.setVisible(True)
            self.qr_window_geometry = self.qr_window.geometry()
        else:
            if not self.qr_window.isVisible():
                self.qr_window.setVisible(True)
                self.qr_window.setGeometry(self.qr_window_geometry)
            else:
                self.qr_window_geometry = self.qr_window.geometry()
                self.qr_window.setVisible(False)
        self.receive_tab.update_receive_qr_window()

    def show_send_tab(self):
        self.tabs.setCurrentIndex(self.tabs.indexOf(self.send_tab))

    def show_receive_tab(self):
        self.tabs.setCurrentIndex(self.tabs.indexOf(self.receive_tab))

    def create_send_tab(self):
        from .send_tab import SendTab
        return SendTab(self)

    def get_contact_payto(self, key):
        _type, label = self.contacts.get(key)
        return label + '  <' + key + '>' if _type == 'address' else key

    def update_completions(self):
        l = [self.get_contact_payto(key) for key in self.contacts.keys()]
        self.completions.setStringList(l)

    @protected
    def protect(self, func, args, password):
        return func(*args, password)

    def run_swap_dialog(
        self,
        *,
        is_reverse: Optional[bool] = None,
        recv_amount_sat_or_max: Optional[Union[int, str]] = None,
        channels: Optional[Sequence['Channel']] = None,
        get_coins: Optional[Callable[..., Sequence[PartialTxInput]]] = None,
    ) -> bool:
        if not self.network:
            self.show_error(_("You are offline."))
            return False
        if not self.wallet.lnworker:
            self.show_error(_('Lightning is disabled'))
            return False
        if not self.wallet.lnworker.num_sats_can_send() and not self.wallet.lnworker.num_sats_can_receive():
            self.show_error(_("You do not have liquidity in your active channels."))
            return False

        transport = self.create_sm_transport()
        if not transport:
            return False

        with transport:
            if not self.initialize_swap_manager(transport):
                return False
            d = SwapDialog(
                self,
                transport,
                is_reverse=is_reverse,
                recv_amount_sat_or_max=recv_amount_sat_or_max,
                channels=channels,
                get_coins=get_coins
            )
            try:
                return d.run(transport)
            except InvalidSwapParameters as e:
                self.show_error(str(e))
                return False
            except UserCancelled:
                return False

    def create_sm_transport(self) -> Optional['SwapServerTransport']:
        sm = self.wallet.lnworker.swap_manager
        if sm.is_server:
            self.show_error(_('Swap server is active'))
            return None

        if self.network is None:
            return None

        if not self.config.SWAPSERVER_URL and not self.config.SWAPSERVER_NPUB:
            if not self.question('\n'.join([
                    _('Electrum uses Nostr in order to find liquidity providers.'),
                    _('Do you want to enable Nostr?'),
            ])):
                return None

        return sm.create_transport()

    def initialize_swap_manager(self, transport: 'SwapServerTransport'):
        sm = self.wallet.lnworker.swap_manager
        if not sm.is_initialized.is_set():
            async def wait_until_initialized():
                timeout = transport.connect_timeout + 1
                try:
                    await asyncio.wait_for(sm.is_initialized.wait(), timeout=timeout)
                except asyncio.TimeoutError:
                    return
            try:
                self.run_coroutine_dialog(wait_until_initialized(), _('Please wait...'))
            except UserCancelled:
                return False
            except Exception as e:
                self.show_error(str(e))
                return False

        if not sm.is_initialized.is_set():
            if not self.config.SWAPSERVER_URL:
                if not self.choose_swapserver_dialog(transport):
                    return False
            else:
                self.show_error(f'Could not contact swap server at {self.config.SWAPSERVER_URL:}')
                return False

        assert sm.is_initialized.is_set()
        return True

    def choose_swapserver_dialog(self, transport: NostrTransport) -> bool:
        assert isinstance(transport, NostrTransport)
        if not transport.is_connected.is_set():
            self.show_message(
                '\n'.join([
                    _('Could not connect to a Nostr relay.'),
                    _('Please check your relays and network connection'),
                ]))
            return False
        recent_offers = transport.get_recent_offers()
        if not recent_offers:
            self.show_message(
                '\n'.join([
                    _('Could not find a swap provider.'),
                ]))
            return False
        sm = self.wallet.lnworker.swap_manager
        from .swap_dialog import SwapServerDialog
        d = SwapServerDialog(self, recent_offers)
        choice = d.run()
        if choice is None:
            return False
        self.config.SWAPSERVER_NPUB = choice
        offer = transport.get_offer(choice)
        sm.update_pairs(offer.pairs)
        return True

    @qt_event_listener
    def on_event_request_status(self, wallet, key, status):
        if wallet != self.wallet:
            return
        req = self.wallet.get_request(key)
        if req is None:
            return
        if status == PR_PAID:
            # FIXME notification should only be shown if request was not PAID before
            msg = _('Payment received')
            amount = req.get_amount_sat()
            if amount:
                msg += ': ' + self.format_amount_and_units(amount)
            msg += '\n' + req.get_message()
            self.notify(msg)
            self.receive_tab.request_list.delete_item(key)
            self.receive_tab.do_clear()
            self.need_update.set()
        else:
            self.receive_tab.request_list.refresh_item(key)

    @qt_event_listener
    def on_event_invoice_status(self, wallet, key, status):
        if wallet != self.wallet:
            return
        if status == PR_PAID:
            self.send_tab.invoice_list.delete_item(key)
        else:
            self.send_tab.invoice_list.refresh_item(key)

    @qt_event_listener
    def on_event_payment_succeeded(self, wallet, key):
        # sent by lnworker, redundant with invoice_status
        if wallet != self.wallet:
            return
        description = self.wallet.get_label_for_rhash(key)
        self.notify(_('Payment sent') + '\n\n' + description)
        self.need_update.set()

    @qt_event_listener
    def on_event_payment_failed(self, wallet, key, reason):
        if wallet != self.wallet:
            return
        description = self.wallet.get_label_for_rhash(key)
        self.notify(_('Payment failed') + '\n\n' + description + '\n\n' + reason)

    def get_coins(self, **kwargs) -> Sequence[PartialTxInput]:
        coins = self.get_manually_selected_coins()
        if coins is not None:
            return coins
        else:
            return self.wallet.get_spendable_coins(None, **kwargs)

    def get_manually_selected_coins(self) -> Optional[Sequence[PartialTxInput]]:
        """Return a list of selected coins or None.
        Note: None means selection is not being used,
              while an empty sequence means the user specifically selected that.
        """
        return self.utxo_list.get_spend_list()

    def broadcast_or_show(self, tx: Transaction, *, invoice: 'Invoice' = None):
        if not tx.is_complete():
            self.show_transaction(tx, invoice=invoice)
            return
        if not self.network:
            self.show_error(_("You can't broadcast a transaction without a live network connection."))
            self.show_transaction(tx, invoice=invoice)
            return
        self.broadcast_transaction(tx, invoice=invoice)

    def broadcast_transaction(self, tx: Transaction, *, invoice: Invoice = None):
        self.send_tab.broadcast_transaction(tx, invoice=invoice)

    @protected
    def sign_tx(
        self,
        tx: PartialTransaction,
        *,
        callback,
        external_keypairs: Optional[Mapping[bytes, bytes]],
        password,
    ):
        self.sign_tx_with_password(tx, callback=callback, password=password, external_keypairs=external_keypairs)

    def sign_tx_with_password(
        self,
        tx: PartialTransaction,
        *,
        callback,
        password,
        external_keypairs: Mapping[bytes, bytes] = None,
    ):
        '''Sign the transaction in a separate thread.  When done, calls
        the callback with a success code of True or False.
        '''

        def on_success(result):
            callback(True)
        def on_failure(exc_info):
            self.on_error(exc_info)
            callback(False)
        on_success = run_hook('tc_sign_wrapper', self.wallet, tx, on_success, on_failure) or on_success
        if external_keypairs:
            # can sign directly
            task = partial(tx.sign, external_keypairs)
        else:
            # ignore_warnings=True, because UI checks and asks user confirmation itself
            task = partial(self.wallet.sign_transaction, tx, password, ignore_warnings=True)
        msg = _('Signing transaction...')
        WaitingDialog(self, msg, task, on_success, on_failure)

    def mktx_for_open_channel(self, *, funding_sat, node_id, get_coins=None):
        def make_tx(fee_policy, *, confirmed_only=False, base_tx=None):
            assert base_tx is None
            coins = get_coins() if get_coins else self.get_coins(nonlocal_only=True, confirmed_only=confirmed_only)
            return self.wallet.lnworker.mktx_for_open_channel(
                coins=coins,
                funding_sat=funding_sat,
                node_id=node_id,
                fee_policy=fee_policy)
        return make_tx

    def open_channel(self, connect_str, funding_sat, *, push_amt=0, get_coins=None):
        try:
            node_id, rest = extract_nodeid(connect_str)
        except ConnStringFormatError as e:
            self.show_error(str(e))
            return
        if self.wallet.lnworker.has_conflicting_backup_with(node_id):
            msg = messages.MSG_CONFLICTING_BACKUP_INSTANCE
            if not self.question(msg):
                return
        # we need to know the fee before we broadcast, because the txid is required
        make_tx = self.mktx_for_open_channel(funding_sat=funding_sat, node_id=node_id, get_coins=get_coins)
        funding_tx, _, _ = self.confirm_tx_dialog(make_tx, funding_sat, context=TxEditorContext.CHANNEL_FUNDING)
        if not funding_tx:
            return
        self._open_channel(connect_str, funding_sat, push_amt, funding_tx)

    def confirm_tx_dialog(
        self,
        make_tx,
        output_value, *,
        payee_outputs: Optional[list[TxOutput]] = None,
        context: TxEditorContext = TxEditorContext.PAYMENT,
        batching_candidates: Sequence[Transaction] = None,
    ) -> tuple[Optional[PartialTransaction], bool, bool]:
        d = ConfirmTxDialog(
            window=self,
            make_tx=make_tx,
            output_value=output_value,
            payee_outputs=payee_outputs,
            context=context,
            batching_candidates=batching_candidates,
        )
        return d.run(), d.is_preview, d.did_swap

    @protected
    def _open_channel(self, connect_str, funding_sat, push_amt, funding_tx, password):
        # read funding_sat from tx; converts '!' to int value
        funding_sat = funding_tx.output_value_for_address(DummyAddress.CHANNEL)
        def task():
            return self.wallet.lnworker.open_channel(
                connect_str=connect_str,
                funding_tx=funding_tx,
                funding_sat=funding_sat,
                push_amt_sat=push_amt,
                password=password)
        def on_failure(exc_info):
            type_, e, traceback = exc_info
            #self.logger.error("Could not open channel", exc_info=exc_info)
            self.show_error(_('Could not open channel: {}').format(repr(e)))
        WaitingDialog(self, _('Opening channel...'), task, self.on_open_channel_success, on_failure)

    def on_open_channel_success(self, args):
        chan, funding_tx = args
        lnworker = self.wallet.lnworker
        if not chan.has_onchain_backup():
            data = lnworker.export_channel_backup(chan.channel_id)
            help_text = messages.MSG_CREATED_NON_RECOVERABLE_CHANNEL
            help_text += '\n\n' + _('Alternatively, you can save a backup of your wallet file from the File menu')
            self.show_qrcode(
                data, _('Save channel backup'),
                help_text=help_text,
                show_copy_text_btn=True)
        n = chan.constraints.funding_txn_minimum_depth
        message = '\n'.join([
            _('Channel established.'),
            _('Remote peer ID') + ':' + chan.node_id.hex(),
            _('This channel will be usable after {} confirmations').format(n)
        ])
        if not funding_tx.is_complete():
            message += '\n\n' + _('Please sign and broadcast the funding transaction')
            self.show_message(message)
            self.show_transaction(funding_tx)
        else:
            self.show_message(message)

    def handle_payment_identifier(self, text: str):
        pi = PaymentIdentifier(self.wallet, text)
        if pi.is_valid():
            self.send_tab.set_payment_identifier(text)
        else:
            if pi.error:
                self.show_error(str(pi.error))

    def set_frozen_state_of_addresses(self, addrs, freeze: bool):
        self.wallet.set_frozen_state_of_addresses(addrs, freeze)
        self.address_list.refresh_all()
        self.utxo_list.refresh_all()
        self.address_list.selectionModel().clearSelection()

    def set_frozen_state_of_coins(self, utxos: Sequence[PartialTxInput], freeze: bool):
        utxos_str = {utxo.prevout.to_str() for utxo in utxos}
        self.wallet.set_frozen_state_of_coins(utxos_str, freeze)
        self.utxo_list.refresh_all()
        self.utxo_list.selectionModel().clearSelection()

    def create_list_tab(self, l):
        w = QWidget()
        w.searchable_list = l
        vbox = QVBoxLayout()
        w.setLayout(vbox)
        #vbox.setContentsMargins(0, 0, 0, 0)
        #vbox.setSpacing(0)
        toolbar = l.create_toolbar(self.config)
        if toolbar:
            vbox.addLayout(toolbar)
        vbox.addWidget(l)
        if toolbar:
            l.show_toolbar()
        return w

    def create_addresses_tab(self):
        from .address_list import AddressList
        self.address_list = AddressList(self)
        tab =  self.create_list_tab(self.address_list)
        tab.is_shown_cv = self.config.cv.GUI_QT_SHOW_TAB_ADDRESSES
        return tab

    def create_utxo_tab(self):
        from .utxo_list import UTXOList
        self.utxo_list = UTXOList(self)
        tab = self.create_list_tab(self.utxo_list)
        tab.is_shown_cv = self.config.cv.GUI_QT_SHOW_TAB_UTXO
        return tab

    def create_contacts_tab(self):
        from .contact_list import ContactList
        self.contact_list = l = ContactList(self)
        tab = self.create_list_tab(l)
        tab.is_shown_cv = self.config.cv.GUI_QT_SHOW_TAB_CONTACTS
        return tab

    def remove_address(self, addr):
        if not self.question(_("Do you want to remove {} from your wallet?").format(addr)):
            return
        try:
            self.wallet.delete_address(addr)
        except UserFacingException as e:
            self.show_error(str(e))
        else:
            self.need_update.set()  # history, addresses, coins
            self.receive_tab.do_clear()

    def payto_contacts(self, labels):
        self.send_tab.payto_contacts(labels)

    def set_contact(self, label, address):
        if not (is_address(address) or is_valid_email(address)):  # email = lightning address
            self.show_error(_('Invalid Address'))
            self.contact_list.update()  # Displays original unchanged value
            return False
        address_type = 'address' if is_address(address) else 'lnaddress'
        self.contacts[address] = (address_type, label)
        self.contact_list.update()
        self.history_list.update()
        self.update_completions()
        return True

    def delete_contacts(self, labels):
        if not self.question(_("Remove {} from your list of contacts?")
                             .format(" + ".join(labels))):
            return
        for label in labels:
            self.contacts.pop(label)
        self.history_list.update()
        self.contact_list.update()
        self.update_completions()

    def show_onchain_invoice(self, invoice: Invoice):
        amount_str = self.format_amount(invoice.get_amount_sat()) + ' ' + self.base_unit()
        d = WindowModalDialog(self, _("Onchain Invoice"))
        vbox = QVBoxLayout(d)
        grid = QGridLayout()
        grid.addWidget(QLabel(_("Amount") + ':'), 1, 0)
        grid.addWidget(QLabel(amount_str), 1, 1)
        if len(invoice.outputs) == 1:
            grid.addWidget(QLabel(_("Address") + ':'), 2, 0)
            grid.addWidget(QLabel(invoice.get_address()), 2, 1)
        else:
            outputs_str = '\n'.join(map(lambda x: x.address + ' : ' + self.format_amount(x.value)+ self.base_unit(), invoice.outputs))
            grid.addWidget(QLabel(_("Outputs") + ':'), 2, 0)
            grid.addWidget(QLabel(outputs_str), 2, 1)
        grid.addWidget(QLabel(_("Description") + ':'), 3, 0)
        grid.addWidget(QLabel(invoice.message), 3, 1)
        if invoice.exp:
            grid.addWidget(QLabel(_("Expires") + ':'), 4, 0)
            grid.addWidget(QLabel(format_time(invoice.exp + invoice.time)), 4, 1)
        buttons = Buttons(CloseButton(d))
        vbox.addLayout(grid)
        vbox.addLayout(buttons)
        d.exec()

    def show_lightning_invoice(self, invoice: Invoice):
        from electrum.util import format_short_id
        lnaddr = decode_bolt11_invoice(invoice.lightning_invoice)
        d = WindowModalDialog(self, _("Lightning Invoice"))
        vbox = QVBoxLayout(d)
        grid = QGridLayout()
        pubkey_e = ShowQRLineEdit(lnaddr.pubkey.serialize().hex(), self.config, title=_("Public Key"))
        pubkey_e.setMinimumWidth(700)
        grid.addWidget(QLabel(_("Public Key") + ':'), 0, 0)
        grid.addWidget(pubkey_e, 0, 1)
        grid.addWidget(QLabel(_("Amount") + ':'), 1, 0)
        amount_str = self.format_amount(invoice.get_amount_sat()) + ' ' + self.base_unit()
        grid.addWidget(QLabel(amount_str), 1, 1)
        grid.addWidget(QLabel(_("Description") + ':'), 2, 0)
        grid.addWidget(QLabel(invoice.message), 2, 1)
        grid.addWidget(QLabel(_("Creation time") + ':'), 3, 0)
        grid.addWidget(QLabel(format_time(invoice.time)), 3, 1)
        if invoice.exp:
            grid.addWidget(QLabel(_("Expiration time") + ':'), 4, 0)
            grid.addWidget(QLabel(format_time(invoice.time + invoice.exp)), 4, 1)
        grid.addWidget(QLabel(_('Features') + ':'), 5, 0)
        grid.addWidget(QLabel(', '.join(lnaddr.get_features().get_names())), 5, 1)
        payhash_e = ShowQRLineEdit(lnaddr.paymenthash.hex(), self.config, title=_("Payment Hash"))
        grid.addWidget(QLabel(_("Payment Hash") + ':'), 6, 0)
        grid.addWidget(payhash_e, 6, 1)
        fallback = lnaddr.get_fallback_address()
        if fallback:
            fallback_e = ShowQRLineEdit(fallback, self.config, title=_("Fallback address"))
            grid.addWidget(QLabel(_("Fallback address") + ':'), 7, 0)
            grid.addWidget(fallback_e, 7, 1)
        invoice_e = ShowQRTextEdit(config=self.config)
        invoice_e.setFont(QFont(MONOSPACE_FONT))
        invoice_e.addCopyButton()
        invoice_e.setText(invoice.lightning_invoice)
        grid.addWidget(QLabel(_('Text') + ':'), 8, 0)
        grid.addWidget(invoice_e, 8, 1)
        r_tags = lnaddr.get_routing_info('r')
        r_tags = '\n'.join(repr(r) for r in BOLT11Addr.format_bolt11_routing_info_as_human_readable(r_tags))
        routing_e = QTextEdit(str(r_tags))
        routing_e.setReadOnly(True)
        grid.addWidget(QLabel(_("Routing Hints") + ':'), 9, 0)
        grid.addWidget(routing_e, 9, 1)
        vbox.addLayout(grid)
        vbox.addLayout(Buttons(CloseButton(d),))
        d.exec()

    def create_console_tab(self):
        from .console import Console
        self.console = console = Console()
        console.is_shown_cv = self.config.cv.GUI_QT_SHOW_TAB_CONSOLE
        return console

    def create_notes_tab(self):
        from PyQt6 import QtGui, QtWidgets
        notes_tab = QtWidgets.QPlainTextEdit()
        notes_tab.setWordWrapMode(QtGui.QTextOption.WrapMode.WrapAnywhere)
        notes_tab.setFont(QtGui.QFont(MONOSPACE_FONT, 10, QtGui.QFont.Weight.Normal))
        notes_tab.setPlainText(self.wallet.db.get('notes_text', ''))
        notes_tab.is_shown_cv = self.config.cv.GUI_QT_SHOW_TAB_NOTES
        notes_tab.textChanged.connect(self.maybe_save_notes_text)
        return notes_tab

    @rate_limited(10, ts_after=True)
    def maybe_save_notes_text(self):
        self.save_notes_text()

    def save_notes_text(self):
        self.logger.info('saving notes')
        self.wallet.db.put('notes_text', self.notes_tab.toPlainText())

    def update_console(self):
        console = self.console
        console.history = self.wallet.db.get_stored_item("qt-console-history", [])
        console.history_index = len(console.history)

        console.updateNamespace({
            'wallet': self.wallet,
            'network': self.network,
            'plugins': self.gui_object.plugins,
            'window': self,
            'config': self.config,
            'electrum': electrum,
            'daemon': self.gui_object.daemon,
            'util': util,
            'bitcoin': bitcoin,
            'lnutil': lnutil,
            'channels': list(self.wallet.lnworker.channels.values()) if self.wallet.lnworker else [],
            'scan_qr': scan_qr_from_screenshot,
        })

        c = commands.Commands(
            config=self.config,
            daemon=self.gui_object.daemon,
            network=self.network,
            callback=lambda: self.console.set_json(True))
        methods = {}
        def mkfunc(f, method):
            return lambda *args, **kwargs: f(method,
                                             args,
                                             self.password_dialog,
                                             **{**kwargs, 'wallet': self.wallet})
        for m in dir(c):
            if m[0]=='_' or m in ['network','wallet','config','daemon']: continue
            methods[m] = mkfunc(c._run, m)

        console.updateNamespace(methods)

    def show_balance_dialog(self):
        balance = self.wallet.get_balances_for_piechart().total()
        if balance == 0 and not self.balance_label.has_warning:
            return
        from .balance_dialog import BalanceDialog
        d = BalanceDialog(self, wallet=self.wallet)
        d.run()

    def create_status_bar(self):
        sb = QStatusBar()
        self.balance_label = BalanceToolButton()
        self.balance_label.setText("Loading wallet...")
        self.balance_label.setAutoRaise(True)
        self.balance_label.clicked.connect(self.show_balance_dialog)
        sb.addWidget(self.balance_label)

        font_height = QFontMetrics(self.balance_label.font()).height()
        sb_height = max(35, int(2 * font_height))
        sb.setFixedHeight(sb_height)

        # remove border of all items in status bar
        self.setStyleSheet("QStatusBar::item { border: 0px;} ")

        self.search_box = QLineEdit()
        self.search_box.textChanged.connect(self.do_search)
        self.search_box.hide()
        sb.addPermanentWidget(self.search_box)

        self.update_check_button = QPushButton("")
        self.update_check_button.setFlat(True)
        self.update_check_button.setCursor(QCursor(Qt.CursorShape.PointingHandCursor))
        self.update_check_button.setIcon(read_QIcon("update.png"))
        self.update_check_button.hide()
        sb.addPermanentWidget(self.update_check_button)

        self.password_required_button = QPushButton(_('Password required'))
        self.password_required_button.setFlat(True)
        self.password_required_button.setCursor(QCursor(Qt.CursorShape.PointingHandCursor))
        self.password_required_button.setIcon(read_QIcon("warning.png"))
        self.password_required_button.setIconSize(self.password_required_button.iconSize() * 1.3)
        self.password_required_button.clicked.connect(self.on_password_required_button_clicked)
        self.password_required_button.hide()
        sb.addPermanentWidget(self.password_required_button)

        self.tasks_label = QLabel('')
        sb.addPermanentWidget(self.tasks_label)

        self.password_button = StatusBarButton(QIcon(), _("Password"), self.change_password_dialog, sb_height)
        sb.addPermanentWidget(self.password_button)

        sb.addPermanentWidget(StatusBarButton(read_QIcon("preferences.png"), _("Preferences"), self.settings_dialog, sb_height))
        self.seed_button = StatusBarButton(read_QIcon("seed.png"), _("Seed"), self.show_seed_dialog, sb_height)
        sb.addPermanentWidget(self.seed_button)
        self.lightning_button = StatusBarButton(read_QIcon("lightning.png"), _("Lightning Network"), self.gui_object.show_lightning_dialog, sb_height)
        sb.addPermanentWidget(self.lightning_button)
        self.update_lightning_icon()
        self.status_button = None
        self.tor_button = None
        if self.network:
            self.tor_button = StatusBarButton(
                read_QIcon("tor_logo.png"),
                _("Tor"),
                partial(self.gui_object.show_network_dialog, proxy_tab=True),
                sb_height,
            )
            sb.addPermanentWidget(self.tor_button)
            self.tor_button.setVisible(False)
            # add status btn last, to place it at rightmost pos
            self.status_button = StatusBarButton(
                read_QIcon("status_disconnected.png"),
                _("Network"),
                self.gui_object.show_network_dialog,
                sb_height,
            )
            sb.addPermanentWidget(self.status_button)
        # add plugins
        run_hook('create_status_bar', sb)
        self.setStatusBar(sb)

    def create_coincontrol_statusbar(self):
        self.coincontrol_sb = sb = QStatusBar()
        sb.setSizeGripEnabled(False)
        #sb.setFixedHeight(3 * char_width_in_lineedit())
        sb.setStyleSheet('QStatusBar::item {border: None;} '
                         + ColorScheme.GREEN.as_stylesheet(True))

        self.coincontrol_label = QLabel()
        self.coincontrol_label.setSizePolicy(QSizePolicy.Policy.Preferred, QSizePolicy.Policy.Preferred)
        self.coincontrol_label.setTextInteractionFlags(Qt.TextInteractionFlag.TextSelectableByMouse)
        sb.addWidget(self.coincontrol_label)

        clear_cc_button = EnterButton(_('Reset'), lambda: self.utxo_list.clear_coincontrol())
        clear_cc_button.setStyleSheet("margin-right: 5px;")
        sb.addPermanentWidget(clear_cc_button)

        sb.setVisible(False)
        return sb

    def set_coincontrol_msg(self, msg: Optional[str]) -> None:
        if not msg:
            self.coincontrol_label.setText("")
            self.coincontrol_sb.setVisible(False)
            return
        self.coincontrol_label.setText(msg)
        self.coincontrol_sb.setVisible(True)

    def update_lightning_icon(self):
        if not self.wallet.has_lightning():
            self.lightning_button.setVisible(False)
            return
        if self.network is None or self.network.channel_db is None:
            self.lightning_button.setVisible(False)
            return
        self.lightning_button.setVisible(True)

        cur, total, progress_percent = self.network.lngossip.get_sync_progress_estimate()
        # self.logger.debug(f"updating lngossip sync progress estimate: cur={cur}, total={total}")
        progress_str = "??%"
        if progress_percent is not None:
            progress_str = f"{progress_percent}%"
        if progress_percent and progress_percent >= 100:
            self.lightning_button.setMaximumWidth(25)
            self.lightning_button.setText('')
            self.lightning_button.setToolTip(_("The Lightning Network graph is fully synced."))
        else:
            self.lightning_button.setMaximumWidth(25 + 6 * char_width_in_lineedit())
            self.lightning_button.setText(progress_str)
            self.lightning_button.setToolTip(_("The Lightning Network graph is syncing...\n"
                                               "Payments are more likely to succeed with a more complete graph."))

    def update_lock_icon(self):
        icon = read_QIcon("lock.png") if self.wallet.has_password() and (self.wallet.get_unlocked_password() is None) else read_QIcon("unlock.png")
        self.password_button.setIcon(icon)

    def update_buttons_on_seed(self):
        self.seed_button.setVisible(self.wallet.has_seed())
        self.password_button.setVisible(self.wallet.may_have_password())

    def change_password_dialog(self):
        from electrum.stored_dict import StorageEncryptionVersion
        if StorageEncryptionVersion.XPUB_PASSWORD in self.wallet.get_available_storage_encryption_versions():
            from .password_dialog import ChangePasswordDialogForHW
            d = ChangePasswordDialogForHW(self, self.wallet)
            ok, old_password, new_password, encrypt_with_xpub = d.run()
            if not ok:
                return
            has_xpub_encryption = self.wallet.storage.get_encryption_version() == StorageEncryptionVersion.XPUB_PASSWORD
            def on_password(hw_dev_pw):
                self._update_wallet_password(
                    old_password = hw_dev_pw if has_xpub_encryption else old_password,
                    new_password = hw_dev_pw if encrypt_with_xpub else new_password,
                    xpub_encrypt=encrypt_with_xpub,
                )
            self.thread.add(
                self.wallet.keystore.get_password_for_storage_encryption,
                on_success=on_password)
        else:
            from .password_dialog import ChangePasswordDialogForSW
            d = ChangePasswordDialogForSW(self, self.wallet)
            ok, old_password, new_password, encrypt_file = d.run()
            if not ok:
                return
            self._update_wallet_password(
                old_password=old_password, new_password=new_password)
        self.update_lock_menu()

    def _update_wallet_password(self, *, old_password, new_password, xpub_encrypt=False):
        try:
            self.wallet.update_password(old_password, new_password, encrypt_storage=True, xpub_encrypt=xpub_encrypt)
        except InvalidPassword as e:
            self.show_error(str(e))
            return
        except BaseException:
            self.logger.exception('Failed to update password')
            self.show_error(_('Failed to update password'))
            return
        msg = _('Password was updated successfully') if self.wallet.has_password() else _('Password is disabled, this wallet is not protected')
        self.show_message(msg, title=_("Success"))
        self.update_lock_icon()

    def toggle_search(self):
        self.search_box.setHidden(not self.search_box.isHidden())
        if not self.search_box.isHidden():
            self.search_box.setFocus()
        else:
            self.do_search('')

    def do_search(self, t):
        tab = self.tabs.currentWidget()
        if hasattr(tab, 'searchable_list'):
            tab.searchable_list.filter(t)

    def new_channel_dialog(self, *, amount_sat=None, min_amount_sat=None):
        from electrum.lnutil import MIN_FUNDING_SAT
        from .new_channel_dialog import NewChannelDialog
        assert self.wallet.can_have_lightning()
        confirmed = self.wallet.get_spendable_balance_sat(confirmed_only=True)
        min_amount_sat = min_amount_sat or MIN_FUNDING_SAT
        if confirmed < min_amount_sat:
            msg = _('Not enough funds') + '\n\n' + _('You need at least {} to open a channel.').format(self.format_amount_and_units(min_amount_sat))
            self.show_error(msg)
            return
        if not self.wallet.has_lightning() and not self.init_lightning_dialog():
            return
        lnworker = self.wallet.lnworker
        if not lnworker.channels and not lnworker.channel_backups:
            msg = _('Do you want to create your first channel?') + '\n\n' + messages.MSG_LIGHTNING_WARNING
            if not self.question(msg):
                return
        d = NewChannelDialog(self, amount_sat=amount_sat, min_amount_sat=min_amount_sat)
        return d.run()

    def new_contact_dialog(self):
        d = WindowModalDialog(self, _("New Contact"))
        vbox = QVBoxLayout(d)
        vbox.addWidget(QLabel(_('New Contact') + ':'))
        grid = QGridLayout()
        line1 = QLineEdit()
        line1.setFixedWidth(32 * char_width_in_lineedit())
        line2 = QLineEdit()
        line2.setFixedWidth(32 * char_width_in_lineedit())
        address_label = QLabel(_("Address"))
        address_label.setToolTip(_("Bitcoin- or Lightning address"))
        grid.addWidget(address_label, 1, 0)
        grid.addWidget(line1, 1, 1)
        grid.addWidget(QLabel(_("Name")), 2, 0)
        grid.addWidget(line2, 2, 1)
        vbox.addLayout(grid)
        vbox.addLayout(Buttons(CancelButton(d), OkButton(d)))
        if d.exec():
            self.set_contact(line2.text(), line1.text())

    def init_lightning_dialog(self, close_dialog: Optional[QDialog] = None) -> bool:
        assert not self.wallet.has_lightning()
        if self.wallet.can_have_deterministic_lightning():
            msg = _(
                "Lightning is not enabled because this wallet was created with an old version of Electrum. "
                "Create lightning keys?")
        else:
            msg = _(
                "Warning: this wallet type does not support channel recovery from seed. "
                "You will need to backup your wallet every time you create a new channel. "
                "Create lightning keys?")
        if self.question(msg):
            self._init_lightning_dialog(close_dialog=close_dialog)
        return self.wallet.has_lightning()

    @protected
    def _init_lightning_dialog(self, *, close_dialog: Optional[QDialog], password):
        if close_dialog is not None:
            close_dialog.close()
        self.wallet.init_lightning(password=password)
        self.update_lightning_icon()
        self.show_message(_('Lightning keys have been initialized.'))

    def show_wallet_info(self):
        from .wallet_info_dialog import WalletInfoDialog
        d = WalletInfoDialog(self, window=self)
        d.exec()

    def remove_wallet(self):
        if self.question('\n'.join([
                _('Delete wallet file?'),
                "%s"%self.wallet.storage.get_path(),
                _('If your wallet contains funds, make sure you have saved its seed.')])):
            self._delete_wallet()

    @protected
    def _delete_wallet(self, password):
        wallet_path = self.wallet.storage.get_path()
        basename = os.path.basename(wallet_path)
        r = self.gui_object.daemon.delete_wallet(wallet_path)
        self.close()
        if r:
            self.show_error(_("Wallet removed: {}").format(basename))
        else:
            self.show_error(_("Wallet file not found: {}").format(basename))

    @protected
    def get_password(self, password, message=None):
        # may be used by plugins to get password
        return password

    @protected
    def show_seed_dialog(self, password):
        if not self.wallet.has_seed():
            self.show_message(_('This wallet has no seed'))
            return
        keystore = self.wallet.get_keystore()
        try:
            seed = keystore.get_seed(password)
            passphrase = keystore.get_passphrase(password)
        except BaseException as e:
            self.show_error(repr(e))
            return
        from .seed_dialog import SeedDialog
        d = SeedDialog(self, seed, passphrase, config=self.config)
        d.exec()

    def show_qrcode(self, data, title=None, parent=None, *,
                    help_text=None, show_copy_text_btn=False):
        if not data:
            return
        if title is None:
            title = _("QR code")
        d = QRDialog(
            data=data,
            parent=parent or self,
            title=title,
            help_text=help_text,
            show_copy_text_btn=show_copy_text_btn,
            config=self.config,
        )
        d.exec()

    @protected
    def show_private_key(self, address, password):
        if not address:
            return
        try:
            pk = self.wallet.export_private_key(address, password)
        except Exception as e:
            self.logger.exception('')
            self.show_message(repr(e))
            return
        xtype = bitcoin.deserialize_privkey(pk)[0]
        d = WindowModalDialog(self, _("Private key"))
        d.setMinimumSize(600, 150)
        vbox = QVBoxLayout()
        vbox.addWidget(QLabel(_("Address") + ': ' + address))
        vbox.addWidget(QLabel(_("Script type") + ': ' + xtype))
        vbox.addWidget(QLabel(_("Private key") + ':'))
        keys_e = ShowQRTextEdit(text=pk, config=self.config)
        keys_e.addCopyButton()
        vbox.addWidget(keys_e)
        vbox.addLayout(Buttons(CloseButton(d)))
        d.setLayout(vbox)
        d.exec()

    msg_sign = _("Signing with an address actually means signing with the corresponding "
                "private key, and verifying with the corresponding public key. The "
                "address you have entered does not have a unique public key, so these "
                "operations cannot be performed.") + '\n\n' + \
               _('The operation is undefined. Not just in Electrum, but in general.')

    @protected
    def do_sign(self, address, message, signature, password):
        address  = address.text().strip()
        message = message.toPlainText().strip()
        if not bitcoin.is_address(address):
            self.show_message(_('Invalid Bitcoin address.'))
            return
        if self.wallet.is_watching_only():
            self.show_message(_('This is a watching-only wallet.'))
            return
        if not self.wallet.is_mine(address):
            self.show_message(_('Address not in wallet.'))
            return
        txin_type = self.wallet.get_txin_type(address)
        if txin_type not in ['p2pkh', 'p2wpkh', 'p2wpkh-p2sh']:
            self.show_message(_('Cannot sign messages with this type of address:') + \
                              ' ' + txin_type + '\n\n' + self.msg_sign)
            return
        task = partial(self.wallet.sign_message, address, message, password)

        def show_signed_message(sig):
            try:
                signature.setText(base64.b64encode(sig).decode('ascii'))
            except RuntimeError:
                # (signature) wrapped C/C++ object has been deleted
                pass

        self.thread.add(task, on_success=show_signed_message)

    def do_verify(self, address, message, signature):
        address  = address.text().strip()
        message = message.toPlainText().strip().encode('utf-8')
        if not bitcoin.is_address(address):
            self.show_message(_('Invalid Bitcoin address.'))
            return
        try:
            # This can throw on invalid base64
            sig = base64.b64decode(str(signature.toPlainText()), validate=True)
            verified = bitcoin.verify_usermessage_with_address(address, sig, message)
        except Exception as e:
            verified = False
        if verified:
            self.show_message(_("Signature verified"))
        else:
            self.show_error(_("Wrong signature"))

    def sign_verify_message(self, address=''):
        d = WindowModalDialog(self, _('Sign/verify Message'))
        d.setMinimumSize(610, 290)

        layout = QGridLayout(d)

        message_e = QTextEdit()
        message_e.setAcceptRichText(False)
        layout.addWidget(QLabel(_('Message')), 1, 0)
        layout.addWidget(message_e, 1, 1)
        layout.setRowStretch(2,3)

        address_e = QLineEdit()
        address_e.setText(address)
        layout.addWidget(QLabel(_('Address')), 2, 0)
        layout.addWidget(address_e, 2, 1)

        signature_e = ScanShowQRTextEdit(config=self.config)
        layout.addWidget(QLabel(_('Signature')), 3, 0)
        layout.addWidget(signature_e, 3, 1)
        layout.setRowStretch(3,1)

        hbox = QHBoxLayout()

        b = QPushButton(_("Sign"))
        b.clicked.connect(lambda: self.do_sign(address_e, message_e, signature_e))
        hbox.addWidget(b)

        b = QPushButton(_("Verify"))
        b.clicked.connect(lambda: self.do_verify(address_e, message_e, signature_e))
        hbox.addWidget(b)

        b = QPushButton(_("Close"))
        b.clicked.connect(d.accept)
        hbox.addWidget(b)
        layout.addLayout(hbox, 4, 1)
        d.exec()

    @protected
    def do_decrypt(self, message_e, pubkey_e, encrypted_e, password):
        if self.wallet.is_watching_only():
            self.show_message(_('This is a watching-only wallet.'))
            return
        ciphertext = encrypted_e.toPlainText()
        task = partial(self.wallet.decrypt_message, pubkey_e.text(), ciphertext, password)

        def setText(text):
            try:
                message_e.setText(text.decode('utf-8'))
            except RuntimeError:
                # (message_e) wrapped C/C++ object has been deleted
                pass

        self.thread.add(task, on_success=setText)

    def do_encrypt(self, message_e, pubkey_e, encrypted_e):
        from electrum import crypto
        message = message_e.toPlainText()
        message = message.encode('utf-8')
        try:
            public_key = ecc.ECPubkey(bfh(pubkey_e.text()))
        except BaseException as e:
            self.logger.exception('Invalid Public key')
            self.show_warning(_('Invalid Public key'))
            return
        encrypted = crypto.ecies_encrypt_message(public_key, message)
        encrypted_e.setText(encrypted.decode('ascii'))

    def encrypt_message(self, address=''):
        d = WindowModalDialog(self, _('Encrypt/decrypt Message'))
        d.setMinimumSize(610, 490)

        layout = QGridLayout(d)

        message_e = QTextEdit()
        message_e.setAcceptRichText(False)
        layout.addWidget(QLabel(_('Message')), 1, 0)
        layout.addWidget(message_e, 1, 1)
        layout.setRowStretch(2,3)

        pubkey_e = QLineEdit()
        if address:
            pubkey = self.wallet.get_public_key(address)
            pubkey_e.setText(pubkey)
        layout.addWidget(QLabel(_('Public key')), 2, 0)
        layout.addWidget(pubkey_e, 2, 1)

        encrypted_e = QTextEdit()
        encrypted_e.setAcceptRichText(False)
        layout.addWidget(QLabel(_('Encrypted')), 3, 0)
        layout.addWidget(encrypted_e, 3, 1)
        layout.setRowStretch(3,1)

        hbox = QHBoxLayout()
        b = QPushButton(_("Encrypt"))
        b.clicked.connect(lambda: self.do_encrypt(message_e, pubkey_e, encrypted_e))
        hbox.addWidget(b)

        b = QPushButton(_("Decrypt"))
        b.clicked.connect(lambda: self.do_decrypt(message_e, pubkey_e, encrypted_e))
        hbox.addWidget(b)

        b = QPushButton(_("Close"))
        b.clicked.connect(d.accept)
        hbox.addWidget(b)

        layout.addLayout(hbox, 4, 1)
        d.exec()

    def tx_from_text(self, data: Union[str, bytes]) -> Union[None, 'PartialTransaction', 'Transaction']:
        from electrum.transaction import tx_from_any
        try:
            return tx_from_any(data)
        except BaseException as e:
            self.show_critical(_("Electrum was unable to parse your transaction") + ":\n" + repr(e))
            return

    def import_channel_backup(self, encrypted: str):
        if not self.question('Import channel backup?'):
            return
        if not self.wallet.lnworker:
            self.show_error(_('Lightning is disabled'))
            return
        try:
            self.wallet.lnworker.import_channel_backup(encrypted)
        except Exception as e:
            self.show_error("failed to import backup" + '\n' + str(e))
            return

    def read_tx_from_qrcode(self):
        def cb(success: bool, error: str, data):
            if not success:
                if error:
                    self.show_error(error)
                return
            if not data:
                return
            # if the user scanned a bitcoin URI
            if data.lower().startswith(BITCOIN_BIP21_URI_SCHEME + ':'):
                self.handle_payment_identifier(data)
                return
            if data.lower().startswith('channel_backup:'):
                self.import_channel_backup(data)
                return
            # else if the user scanned an offline signed tx
            tx = self.tx_from_text(data)
            if not tx:
                return
            self.show_transaction(tx)

        scan_qrcode_from_camera(parent=self.top_level_window(), config=self.config, callback=cb)

    def read_tx_from_file(self) -> Optional[Transaction]:
        fileName = getOpenFileName(
            parent=self,
            title=_("Select your transaction file"),
            filter=TRANSACTION_FILE_EXTENSION_FILTER_ANY,
            config=self.config,
        )
        if not fileName:
            return
        file_content = None  # type: None | str | bytes
        # 1. try to open file as "text"
        try:
            with open(fileName, "r", encoding="ascii") as f:
                file_content = f.read()  # type: str
        except (ValueError, IOError, os.error) as reason:
            pass
        else:
            assert isinstance(file_content, str), f"expected str, got {type(file_content)}"
            file_content = file_content.strip()  # for text, we can safely strip leading/trailing whitespaces
        # 2. try to open file as "binary"
        if file_content is None:
            try:
                with open(fileName, "rb") as f:
                    file_content = f.read()  # type: bytes
            except (ValueError, IOError, os.error) as reason:
                self.show_critical(_("Electrum was unable to open your transaction file") + "\n" + str(reason),
                                   title=_("Unable to read file or no transaction found"))
        if file_content is None:
            return None
        return self.tx_from_text(file_content)

    def do_process_from_text(self):
        text = text_dialog(
            parent=self,
            title=_('Input raw transaction'),
            header_layout=_("Transaction:"),
            ok_label=_("Load transaction"),
            config=self.config,
        )
        if not text:
            return
        tx = self.tx_from_text(text)
        if tx:
            self.show_transaction(tx)

    def do_process_from_text_channel_backup(self):
        text = text_dialog(
            parent=self,
            title=_('Input channel backup'),
            header_layout=_("Channel Backup:"),
            ok_label=_("Load backup"),
            config=self.config,
        )
        if not text:
            return
        if text.startswith('channel_backup:'):
            self.import_channel_backup(text)

    def do_process_from_file(self):
        tx = self.read_tx_from_file()
        if tx:
            self.show_transaction(tx)

    def do_process_from_txid(self, *, parent: QWidget = None, txid: str = None):
        if parent is None:
            parent = self
        from electrum import transaction
        if txid is None:
            txid, ok = QInputDialog.getText(parent, _('Lookup transaction'), _('Transaction ID') + ':')
            if not ok:
                txid = None
        if not txid:
            return
        txid = str(txid).strip()
        tx = self.wallet.adb.get_transaction(txid)
        if tx is None:
            raw_tx = self._fetch_tx_from_network(txid, parent=parent)
            if not raw_tx:
                return
            tx = transaction.Transaction(raw_tx)
        self.show_transaction(tx)

    def _fetch_tx_from_network(self, txid: str, *, parent: QWidget = None) -> Optional[str]:
        if not self.network:
            self.show_message(_("You are offline."), parent=parent)
            return
        try:
            raw_tx = self.network.run_from_another_thread(
                self.network.get_transaction(txid, timeout=10))
        except UntrustedServerReturnedError as e:
            self.logger.info(f"Error getting transaction from network: {repr(e)}")
            self.show_message(
                _("Error getting transaction from network") + ":\n" + e.get_message_for_gui(),
                parent=parent,
            )
            return
        except Exception as e:
            self.show_message(
                _("Error getting transaction from network") + ":\n" + repr(e),
                parent=parent,
            )
            return
        return raw_tx

    @protected
    def export_privkeys_dialog(self, password):
        if self.wallet.is_watching_only():
            self.show_message(_("This is a watching-only wallet"))
            return

        if isinstance(self.wallet, Multisig_Wallet):
            self.show_message(_('WARNING: This is a multi-signature wallet.') + '\n' +
                              _('It cannot be "backed up" by simply exporting these private keys.'))

        d = WindowModalDialog(self, _('Private keys'))
        d.setMinimumSize(980, 300)
        vbox = QVBoxLayout(d)

        msg = "%s\n%s\n%s" % (_("WARNING: ALL your private keys are secret."),
                              _("Exposing a single private key can compromise your entire wallet!"),
                              _("In particular, DO NOT use 'redeem private key' services proposed by third parties."))
        vbox.addWidget(QLabel(msg))

        e = QTextEdit()
        e.setReadOnly(True)
        vbox.addWidget(e)

        defaultname = f'electrum-private-keys-{self.wallet.basename()}.csv'
        select_msg = _('Select file to export your private keys to')
        hbox, filename_e, csv_button = filename_field(self, self.config, defaultname, select_msg)
        vbox.addLayout(hbox)

        b = OkButton(d, _('Export'))
        b.setEnabled(False)
        vbox.addLayout(Buttons(CancelButton(d), b))

        private_keys = {}
        addresses = self.wallet.get_addresses()
        done = False
        cancelled = False
        def privkeys_thread():
            for addr in addresses:
                time.sleep(0.1)
                if done or cancelled:
                    break
                privkey = self.wallet.export_private_key(addr, password)
                private_keys[addr] = privkey
                self.computing_privkeys_signal.emit()
            if not cancelled:
                self.computing_privkeys_signal.disconnect()
                self.show_privkeys_signal.emit()

        def show_privkeys():
            s = "\n".join(map(lambda x: x[0] + "\t"+ x[1], private_keys.items()))
            e.setText(s)
            b.setEnabled(True)
            self.show_privkeys_signal.disconnect()
            nonlocal done
            done = True

        def on_dialog_closed(*args):
            nonlocal cancelled
            if not done:
                cancelled = True
                self.computing_privkeys_signal.disconnect()
                self.show_privkeys_signal.disconnect()

        self.computing_privkeys_signal.connect(lambda: e.setText("Please wait... %d/%d"%(len(private_keys),len(addresses))))
        self.show_privkeys_signal.connect(show_privkeys)
        d.finished.connect(on_dialog_closed)
        threading.Thread(target=privkeys_thread).start()

        if not d.exec():
            done = True
            return

        filename = filename_e.text()
        if not filename:
            return

        try:
            self.do_export_privkeys(filename, private_keys, csv_button.isChecked())
        except (IOError, os.error) as reason:
            txt = "\n".join([
                _("Electrum was unable to produce a private key-export."),
                str(reason)
            ])
            self.show_critical(txt, title=_("Unable to create csv"))

        except Exception as e:
            self.show_message(repr(e))
            return

        self.show_message(_("Private keys exported."))

    def do_export_privkeys(self, fileName, pklist, is_csv):
        with open(fileName, "w+") as f:
            os_chmod(fileName, 0o600)  # set restrictive perms *before* we write data
            if is_csv:
                transaction = csv.writer(f)
                transaction.writerow(["address", "private_key"])
                for addr, pk in pklist.items():
                    transaction.writerow(["%34s"%addr,pk])
            else:
                f.write(json.dumps(pklist, indent = 4))

    def do_import_labels(self):
        def on_import():
            self.need_update.set()
        import_meta_gui(self, _('labels'), self.wallet.import_labels, on_import)

    def do_export_labels(self):
        export_meta_gui(self, _('labels'), self.wallet.export_labels)

    def import_invoices(self):
        import_meta_gui(self, _('invoices'), self.wallet.import_invoices, self.send_tab.invoice_list.update)

    def export_invoices(self):
        export_meta_gui(self, _('invoices'), self.wallet.export_invoices)

    def import_requests(self):
        import_meta_gui(self, _('requests'), self.wallet.import_requests, self.receive_tab.request_list.update)

    def export_requests(self):
        export_meta_gui(self, _('requests'), self.wallet.export_requests)

    def import_contacts(self):
        import_meta_gui(self, _('contacts'), self.contacts.import_file, self.contact_list.update)

    def export_contacts(self):
        export_meta_gui(self, _('contacts'), self.contacts.export_file)


    def sweep_key_dialog(self):
        if not self.network:
            self.show_error(_("You are offline."))
            return
        d = WindowModalDialog(self, title=_('Sweep private keys'))
        d.setMinimumSize(600, 300)
        vbox = QVBoxLayout(d)
        hbox_top = QHBoxLayout()
        hbox_top.addWidget(QLabel(_("Enter private keys to sweep coins from:")))
        hbox_top.addWidget(InfoButton(WIF_HELP_TEXT), alignment=Qt.AlignmentFlag.AlignRight)
        vbox.addLayout(hbox_top)
        keys_e = ScanQRTextEdit(allow_multi=True, config=self.config)
        keys_e.setTabChangesFocus(True)
        vbox.addWidget(keys_e)
        vbox.addWidget(QLabel(_("Send to address") + ":"))

        addresses = self.wallet.get_unused_addresses()
        if not addresses:
            addresses = self.wallet.get_receiving_addresses()
        h, address_e = address_field(addresses)
        vbox.addLayout(h)

        vbox.addStretch(1)
        button = OkButton(d, _('Sweep'))
        vbox.addLayout(Buttons(CancelButton(d), button))
        button.setEnabled(False)

        def get_address():
            addr = str(address_e.text()).strip()
            if bitcoin.is_address(addr):
                return addr

        def get_pk(*, raise_on_error=False) -> Sequence[str]:
            text = str(keys_e.toPlainText())
            return keystore.get_private_keys(text, raise_on_error=raise_on_error)

        def on_edit():
            valid_privkeys = False
            try:
                valid_privkeys = bool(get_pk(raise_on_error=True))
            except Exception as e:
                button.setToolTip(f'{_("Error")}: {repr(e)}')
            else:
                button.setToolTip('')
            button.setEnabled(get_address() is not None and valid_privkeys)
        on_address = lambda text: address_e.setStyleSheet((ColorScheme.DEFAULT if get_address() else ColorScheme.RED).as_stylesheet())
        keys_e.textChanged.connect(on_edit)
        address_e.textChanged.connect(on_edit)
        address_e.textChanged.connect(on_address)
        on_address(str(address_e.text()))
        if not d.exec():
            return
        # user pressed "sweep"
        addr = get_address()
        try:
            self.wallet.check_address_for_corruption(addr)
        except InternalAddressCorruption as e:
            self.show_error(str(e))
            raise
        privkeys = get_pk()

        def on_success(result):
            coins, keypairs = result
            outputs = [PartialTxOutput.from_address_and_value(addr, value='!')]
            self.warn_if_watching_only()
            self.send_tab.pay_onchain_dialog(
                outputs, external_keypairs=keypairs, get_coins=lambda *args, **kwargs: coins)
        def on_failure(exc_info):
            self.on_error(exc_info)
        msg = _('Preparing sweep transaction...')
        task = lambda: self.network.run_from_another_thread(
            sweep_preparations(privkeys, self.network))
        WaitingDialog(self, msg, task, on_success, on_failure)

    def _do_import(self, title, header_layout, func):
        text = text_dialog(
            parent=self,
            title=title,
            header_layout=header_layout,
            ok_label=_('Import'),
            allow_multi=True,
            config=self.config,
        )
        if not text:
            return
        keys = str(text).split()
        good_inputs, bad_inputs = func(keys)
        if good_inputs:
            msg = '\n'.join(good_inputs[:10])
            if len(good_inputs) > 10: msg += '\n...'
            self.show_message(_("The following addresses were added")
                              + f' ({len(good_inputs)}):\n' + msg)
        if bad_inputs:
            msg = "\n".join(f"{key[:10]}... ({msg})" for key, msg in bad_inputs[:10])
            if len(bad_inputs) > 10: msg += '\n...'
            self.show_error(_("The following inputs could not be imported")
                            + f' ({len(bad_inputs)}):\n' + msg)
        self.address_list.update()
        self.history_list.update()

    def import_addresses(self):
        if not self.wallet.can_import_address():
            return
        title, msg = _('Import addresses'), _("Enter addresses")+':'
        self._do_import(title, msg, self.wallet.import_addresses)

    @protected
    def do_import_privkey(self, password):
        if not self.wallet.can_import_privkey():
            return
        title = _('Import private keys')
        header_layout = QHBoxLayout()
        header_layout.addWidget(QLabel(_("Enter private keys")+':'))
        header_layout.addWidget(InfoButton(WIF_HELP_TEXT), alignment=Qt.AlignmentFlag.AlignRight)
        self._do_import(title, header_layout, lambda x: self.wallet.import_private_keys(x, password))

    def refresh_amount_edits(self):
        edits = self.send_tab.amount_e, self.receive_tab.receive_amount_e
        amounts = [edit.get_amount() for edit in edits]
        for edit, amount in zip(edits, amounts):
            edit.setAmount(amount)

    def update_fiat(self):
        b = self.fx and self.fx.is_enabled()
        self.send_tab.fiat_send_e.setVisible(b)
        self.receive_tab.fiat_receive_e.setVisible(b)
        self.history_model.refresh('update_fiat')
        self.history_list.update_toolbar_menu()
        self.address_list.refresh_headers()
        self.address_list.update()
        self.update_status()

    def settings_dialog(self):
        from .settings_dialog import SettingsDialog
        d = SettingsDialog(self, self.config)
        d.exec()
        if self.fx:
            self.fx.trigger_update()
        run_hook('close_settings_dialog')
        if d.need_restart:
            self.show_warning(_('Please restart Electrum to activate the new GUI settings'), title=_('Success'))
        else:
            # Some values might need to be updated if settings have changed.
            # For example 'Can send' in the lightning tab will change if the fees config is changed.
            self.refresh_tabs()

    def _show_closing_warnings(self) -> bool:
        """Show any closing warnings and return True if the user chose to quit anyway."""

        warnings: Set[str] = set()
        for cb in self.closing_warning_callbacks:
            if warning := cb():
                warnings.add(warning)

        for warning in list(warnings)[:3]:
            warning = ''.join([
                _("Are you sure you want to close Electrum?"),
                '\n\n',
                _("An ongoing operation requires you to stay online."),
                '\n',
                warning
            ])
            result = self.question(
                msg=warning,
                icon=QMessageBox.Icon.Warning,
                title=_("Warning"),
            )
            if not result:
                break
        else:
            # user chose to cancel all warnings or there were no warnings
            return True
        return False

    def register_closing_warning_callback(self, callback: Callable[[], Optional[str]]) -> None:
        """
        Registers a callback that will be called when the wallet is closed. If the callback
        returns a string it will be shown to the user as a warning to prevent them closing the wallet.
        """
        assert not inspect.iscoroutinefunction(callback)
        def warning_callback() -> Optional[str]:
            try:
                return callback()
            except Exception:
                self.logger.exception("Error in closing warning callback")
                return None
        self.logger.debug(f"registering wallet closing warning callback")
        self.closing_warning_callbacks.append(warning_callback)

    def _check_ongoing_force_closures(self) -> Optional[str]:
        from electrum.lnutil import MIN_FINAL_CLTV_DELTA_ACCEPTED
        if not self.wallet.has_lightning():
            return None
        if not self.network:
            return None
        force_closes = self.wallet.lnworker.lnwatcher.get_pending_force_closes()
        if not force_closes:
            return
        # fixme: this is inaccurate, we need local_height - cltv_of_htlc
        cltv_delta = MIN_FINAL_CLTV_DELTA_ACCEPTED
        msg = '\n\n'.join([
            _("Pending channel force-close"),
            messages.MSG_FORCE_CLOSE_WARNING.format(cltv_delta),
        ])
        return msg

    def _check_ongoing_submarine_swaps_callback(self) -> Optional[str]:
        """Callback that will return a warning string if there are unconfirmed swap funding txs."""
        from electrum.submarine_swaps import MIN_FINAL_CLTV_DELTA_FOR_CLIENT, LOCKTIME_DELTA_REFUND
        if not (self.wallet.has_lightning() and self.wallet.lnworker.swap_manager):
            return None
        if not self.network:
            return None
        ongoing_swaps = self.wallet.lnworker.swap_manager.get_pending_swaps()
        if not ongoing_swaps:
            return None
        is_forward = any(not swap.is_reverse for swap in ongoing_swaps)
        if is_forward:
            # fixme: this is inaccurate, we need local_height - cltv_of_htlc
            delta = MIN_FINAL_CLTV_DELTA_FOR_CLIENT
            warning = messages.MSG_FORWARD_SWAP_WARNING.format(delta)
        else:
            locktime = min(swap.locktime for swap in ongoing_swaps)
            delta = locktime - self.wallet.adb.get_local_height()
            warning = messages.MSG_REVERSE_SWAP_WARNING.format(delta)
        return "\n\n".join((
            _("Pending submarine swap"),
            warning,
        ))

    def closeEvent(self, event):
        # note that closeEvent is NOT called if the user quits with Ctrl-C
        if not self._show_closing_warnings():
            event.ignore()
            return
        self.clean_up()
        event.accept()

    def clean_up(self):
        if self._cleaned_up:
            return
        self._cleaned_up = True
        if self.thread:
            self.thread.stop()
            self.thread = None
        with self._coroutines_scheduled_lock:
            coro_keys = list(self._coroutines_scheduled.keys())
        for fut in coro_keys:
            fut.cancel()
        self.wallet.txbatcher.set_password_future(None)
        self.unregister_callbacks()
        self.config.GUI_QT_WINDOW_IS_MAXIMIZED = self.isMaximized()
        self.save_notes_text()
        if not self.isMaximized():
            g = self.geometry()
            self.wallet.db.put(
                "winpos-qt", [g.left(),g.top(), g.width(),g.height()])
        if self.qr_window:
            self.qr_window.close()
        self.close_wallet()

        if self._update_check_thread:
            self._update_check_thread.stop()
        if self.tray:
            self.tray = None
        self.timer.stop()
        self.gui_object.close_window(self)

    def cpfp_dialog(self, parent_tx: Transaction) -> None:
        new_tx = self.wallet.cpfp(parent_tx, 0)
        total_size = parent_tx.estimated_size() + new_tx.estimated_size()
        parent_txid = parent_tx.txid()
        assert parent_txid
        parent_fee = self.wallet.get_tx_info(parent_tx).fee
        if parent_fee is None:
            self.show_error(_("Can't CPFP: unknown fee for parent transaction."))
            return
        d = WindowModalDialog(self, _('Child Pays for Parent'))
        vbox = QVBoxLayout(d)
        msg = _(
            "A CPFP is a transaction that sends an unconfirmed output back to "
            "yourself, with a high fee. The goal is to have miners confirm "
            "the parent transaction in order to get the fee attached to the "
            "child transaction.")
        vbox.addWidget(WWLabel(msg))
        msg2 = _("The proposed fee is computed using your "
            "fee/kB settings, applied to the total size of both child and "
            "parent transactions. After you broadcast a CPFP transaction, "
            "it is normal to see a new unconfirmed transaction in your history.")
        vbox.addWidget(WWLabel(msg2))
        grid = QGridLayout()
        grid.addWidget(QLabel(_('Total size') + ':'), 0, 0)
        grid.addWidget(QLabel(f"{total_size} {UI_UNIT_NAME_TXSIZE_VBYTES}"), 0, 1)
        max_fee = new_tx.output_value()
        grid.addWidget(QLabel(_('Input amount') + ':'), 1, 0)
        grid.addWidget(QLabel(self.format_amount(max_fee) + ' ' + self.base_unit()), 1, 1)
        output_amount = QLabel('')
        grid.addWidget(QLabel(_('Output amount') + ':'), 2, 0)
        grid.addWidget(output_amount, 2, 1)
        fee_e = BTCAmountEdit(self.get_decimal_point)
        combined_fee = QLabel('')
        combined_feerate = QLabel('')
        def on_fee_edit(x):
            fee_for_child = fee_e.get_amount()
            if fee_for_child is None:
                return
            out_amt = max_fee - fee_for_child
            out_amt_str = (self.format_amount(out_amt) + ' ' + self.base_unit()) if out_amt else ''
            output_amount.setText(out_amt_str)
            comb_fee = parent_fee + fee_for_child
            comb_fee_str = (self.format_amount(comb_fee) + ' ' + self.base_unit()) if comb_fee else ''
            combined_fee.setText(comb_fee_str)
            comb_feerate = comb_fee / total_size * 1000
            comb_feerate_str = self.format_fee_rate(comb_feerate) if comb_feerate else ''
            combined_feerate.setText(comb_feerate_str)
        fee_e.textChanged.connect(on_fee_edit)
        def get_child_fee_from_total_feerate(fee_per_kb: Optional[int]) -> Optional[int]:
            if fee_per_kb is None:
                return None
            package_fee = FeePolicy.estimate_fee_for_feerate(fee_per_kb=fee_per_kb, size=total_size)
            child_fee = package_fee - parent_fee
            child_fee = min(max_fee, child_fee)
            # pay at least minrelayfee for combined size:
            min_child_fee = FeePolicy.estimate_fee_for_feerate(fee_per_kb=self.wallet.relayfee(), size=total_size)
            child_fee = max(min_child_fee, child_fee)
            return child_fee
        fee_policy = FeePolicy(self.config.FEE_POLICY)
        suggested_feerate = fee_policy.fee_per_kb(self.network)
        fee = get_child_fee_from_total_feerate(suggested_feerate)
        fee_e.setAmount(fee)
        grid.addWidget(QLabel(_('Fee for child') + ':'), 3, 0)
        grid.addWidget(fee_e, 3, 1)
        def on_rate(fee_rate):
            fee = get_child_fee_from_total_feerate(fee_rate)
            fee_e.setAmount(fee)
        fee_slider = FeeSlider(parent=self, network=self.network, fee_policy=fee_policy, callback=on_rate)
        fee_combo = FeeComboBox(fee_slider)
        fee_slider.update()
        grid.addWidget(fee_slider, 4, 1)
        grid.addWidget(fee_combo, 4, 2)
        grid.addWidget(QLabel(_('Total fee') + ':'), 5, 0)
        grid.addWidget(combined_fee, 5, 1)
        grid.addWidget(QLabel(_('Total feerate') + ':'), 6, 0)
        grid.addWidget(combined_feerate, 6, 1)
        vbox.addLayout(grid)
        vbox.addLayout(Buttons(CancelButton(d), OkButton(d)))
        if not d.exec():
            return
        fee = fee_e.get_amount()
        if fee is None:
            return  # fee left empty, treat it as "cancel"
        if fee > max_fee:
            self.show_error(_('Max fee exceeded'))
            return
        try:
            new_tx = self.wallet.cpfp(parent_tx, fee)
        except CannotCPFP as e:
            self.show_error(str(e))
            return
        self.show_transaction(new_tx)

    def bump_fee_dialog(self, tx: Transaction):
        if not isinstance(tx, PartialTransaction):
            tx = PartialTransaction.from_tx(tx)
        if not tx.add_info_from_wallet_and_network(wallet=self.wallet, show_error=self.show_error):
            return
        d = BumpFeeDialog(main_window=self, tx=tx)
        d.run()

    def dscancel_dialog(self, tx: Transaction):
        if not isinstance(tx, PartialTransaction):
            tx = PartialTransaction.from_tx(tx)
        if not tx.add_info_from_wallet_and_network(wallet=self.wallet, show_error=self.show_error):
            return
        d = DSCancelDialog(main_window=self, tx=tx)
        d.run()

    def save_transaction_into_wallet(self, tx: Transaction):
        win = self.top_level_window()
        try:
            if not self.wallet.adb.add_transaction(tx):
                win.show_error(_("Transaction could not be saved.") + "\n" +
                               _("It conflicts with current history."))
                return False
        except AddTransactionException as e:
            win.show_error(e)
            return False
        else:
            self.wallet.save_db()
            # need to update at least: history_list, utxo_list, address_list
            self.need_update.set()
            msg = (_("Transaction added to wallet history.") + '\n\n' +
                   _("Note: this is an offline transaction, if you want the network "
                     "to see it, you need to broadcast it."))
            win.msg_box(QPixmap(icon_path("offline_tx.png")), None, _('Success'), msg)
            return True

    def show_cert_mismatch_error(self):
        if self.showing_cert_mismatch_error:
            return
        self.showing_cert_mismatch_error = True
        self.show_critical(title=_("Certificate mismatch"),
                           msg=_("The SSL certificate provided by the main server did not match the fingerprint passed in with the --serverfingerprint option.") + "\n\n" +
                               _("Electrum will now exit."))
        self.showing_cert_mismatch_error = False
        self.close()

    def rebalance_dialog(self, chan1, chan2, amount_sat=None):
        from .rebalance_dialog import RebalanceDialog
        if chan1 is None or chan2 is None:
            return
        d = RebalanceDialog(self, chan1, chan2, amount_sat)
        d.run()

    def on_swap_result(self, txid: Optional[str], *, is_reverse: bool):
        msg = _("Submarine swap") + ': ' + (_("Success") if txid else _("Expired")) + '\n\n'
        if txid:
            msg += _("Funding transaction") + ': ' + txid + '\n\n'
            if is_reverse:
                msg += messages.MSG_REVERSE_SWAP_FUNDING_MEMPOOL
            else:
                msg += messages.MSG_FORWARD_SWAP_FUNDING_MEMPOOL
            self.show_message_signal.emit(msg)
        else:
            msg += _("Lightning funds were not received.")  # FIXME should this not depend on is_reverse?
            self.show_error_signal.emit(msg)

    def set_payment_identifier(self, pi: str):
        # delegate to send_tab
        self.send_tab.set_payment_identifier(pi)
