text: # Copyright (C) 2018 The Electrum developers
  # Distributed under the MIT software license, see the accompanying
  # file LICENCE or http://www.opensource.org/licenses/mit-license.php
  
  import os
  import json
  import sys
  import threading
  import traceback
  from typing import Tuple, List, Callable, NamedTuple, Optional, TYPE_CHECKING
  from functools import partial
  
  from PyQt5.QtCore import QRect, QEventLoop, Qt, pyqtSignal
  from PyQt5.QtGui import QPalette, QPen, QPainter, QPixmap
  from PyQt5.QtWidgets import (QWidget, QDialog, QLabel, QHBoxLayout, QMessageBox,
                               QVBoxLayout, QLineEdit, QFileDialog, QPushButton,
                               QGridLayout, QSlider, QScrollArea, QApplication)
  
  from electrum.wallet import Wallet, Abstract_Wallet
  from electrum.storage import WalletStorage, StorageReadWriteError
  from electrum.util import UserCancelled, InvalidPassword, WalletFileException, get_new_wallet_name
  from electrum.base_wizard import BaseWizard, HWD_SETUP_DECRYPT_WALLET, GoBack, ReRunDialog
  from electrum.network import Network
  from electrum.i18n import _
  
  from .seed_dialog import SeedLayout, KeysLayout
  from .network_dialog import NetworkChoiceLayout
  from .util import (MessageBoxMixin, Buttons, icon_path, ChoicesLayout, WWLabel,
                     InfoButton, char_width_in_lineedit, PasswordLineEdit)
  from .password_dialog import PasswordLayout, PasswordLayoutForHW, PW_NEW
  from .bip39_recovery_dialog import Bip39RecoveryDialog
  from electrum.plugin import run_hook, Plugins
  
  if TYPE_CHECKING:
      from electrum.simple_config import SimpleConfig
      from electrum.wallet_db import WalletDB
      from . import ElectrumGui
  
  
  MSG_ENTER_PASSWORD = _("Choose a password to encrypt your wallet keys.") + '\n'\
                       + _("Leave this field empty if you want to disable encryption.")
  MSG_HW_STORAGE_ENCRYPTION = _("Set wallet file encryption.") + '\n'\
                            + _("Your wallet file does not contain secrets, mostly just metadata. ") \
                            + _("It also contains your master public key that allows watching your addresses.") + '\n\n'\
                            + _("Note: If you enable this setting, you will need your hardware device to open your wallet.")
  WIF_HELP_TEXT = (_('WIF keys are typed in Electrum, based on script type.') + '\n\n' +
                   _('A few examples') + ':\n' +
                   'p2pkh:KxZcY47uGp9a...       \t-> 1DckmggQM...\n' +
                   'p2wpkh-p2sh:KxZcY47uGp9a... \t-> 3NhNeZQXF...\n' +
                   'p2wpkh:KxZcY47uGp9a...      \t-> bc1q3fjfk...')
  # note: full key is KxZcY47uGp9aVQAb6VVvuBs8SwHKgkSR2DbZUzjDzXf2N2GPhG9n
  MSG_PASSPHRASE_WARN_ISSUE4566 = _("Warning") + ": "\
                                + _("You have multiple consecutive whitespaces or leading/trailing "
                                    "whitespaces in your passphrase.") + " " \
                                + _("This is discouraged.") + " " \
                                + _("Due to a bug, old versions of Electrum will NOT be creating the "
                                    "same wallet as newer versions or other software.")
  
  
  class CosignWidget(QWidget):
      size = 120
  
      def __init__(self, m, n):
          QWidget.__init__(self)
          self.R = QRect(0, 0, self.size, self.size)
          self.setGeometry(self.R)
          self.setMinimumHeight(self.size)
          self.setMaximumHeight(self.size)
          self.m = m
          self.n = n
  
      def set_n(self, n):
          self.n = n
          self.update()
  
      def set_m(self, m):
          self.m = m
          self.update()
  
      def paintEvent(self, event):
          bgcolor = self.palette().color(QPalette.Background)
          pen = QPen(bgcolor, 7, Qt.SolidLine)
          qp = QPainter()
          qp.begin(self)
          qp.setPen(pen)
          qp.setRenderHint(QPainter.Antialiasing)
          qp.setBrush(Qt.gray)
          for i in range(self.n):
              alpha = int(16* 360 * i/self.n)
              alpha2 = int(16* 360 * 1/self.n)
              qp.setBrush(Qt.green if i<self.m else Qt.gray)
              qp.drawPie(self.R, alpha, alpha2)
          qp.end()
  
  
  
  def wizard_dialog(func):
      def func_wrapper(*args, **kwargs):
          run_next = kwargs['run_next']
          wizard = args[0]  # type: InstallWizard
          while True:
              #wizard.logger.debug(f"dialog stack. len: {len(wizard._stack)}. stack: {wizard._stack}")
              wizard.back_button.setText(_('Back') if wizard.can_go_back() else _('Cancel'))
              # current dialog
              try:
                  out = func(*args, **kwargs)
                  if type(out) is not tuple:
                      out = (out,)
              except GoBack:
                  if not wizard.can_go_back():
                      wizard.close()
                      raise UserCancelled
                  else:
                      # to go back from the current dialog, we just let the caller unroll the stack:
                      raise
              # next dialog
              try:
                  while True:
                      try:
                          run_next(*out)
                      except ReRunDialog:
                          # restore state, and then let the loop re-run next
                          wizard.go_back(rerun_previous=False)
                      else:
                          break
              except GoBack as e:
                  # to go back from the next dialog, we ask the wizard to restore state
                  wizard.go_back(rerun_previous=False)
                  # and we re-run the current dialog
                  if wizard.can_go_back():
                      # also rerun any calculations that might have populated the inputs to the current dialog,
                      # by going back to just after the *previous* dialog finished
                      raise ReRunDialog() from e
                  else:
                      continue
              else:
                  break
      return func_wrapper
  
  
  class WalletAlreadyOpenInMemory(Exception):
      def __init__(self, wallet: Abstract_Wallet):
          super().__init__()
          self.wallet = wallet
  
  
  # WindowModalDialog must come first as it overrides show_error
  class InstallWizard(QDialog, MessageBoxMixin, BaseWizard):
  
      accept_signal = pyqtSignal()
  
      def __init__(self, config: 'SimpleConfig', app: QApplication, plugins: 'Plugins', *, gui_object: 'ElectrumGui'):
          QDialog.__init__(self, None)
          BaseWizard.__init__(self, config, plugins)
          self.setWindowTitle('Electrum LitecoinFinance  -  ' + _('Install Wizard'))
          self.app = app
          self.config = config
          self.gui_thread = gui_object.gui_thread
          self.setMinimumSize(600, 400)
          self.accept_signal.connect(self.accept)
          self.title = QLabel()
          self.main_widget = QWidget()
          self.back_button = QPushButton(_("Back"), self)
          self.back_button.setText(_('Back') if self.can_go_back() else _('Cancel'))
          self.next_button = QPushButton(_("Next"), self)
          self.next_button.setDefault(True)
          self.logo = QLabel()
          self.please_wait = QLabel(_("Please wait..."))
          self.please_wait.setAlignment(Qt.AlignCenter)
          self.icon_filename = None
          self.loop = QEventLoop()
          self.rejected.connect(lambda: self.loop.exit(0))
          self.back_button.clicked.connect(lambda: self.loop.exit(1))
          self.next_button.clicked.connect(lambda: self.loop.exit(2))
          outer_vbox = QVBoxLayout(self)
          inner_vbox = QVBoxLayout()
          inner_vbox.addWidget(self.title)
          inner_vbox.addWidget(self.main_widget)
          inner_vbox.addStretch(1)
          inner_vbox.addWidget(self.please_wait)
          inner_vbox.addStretch(1)
          scroll_widget = QWidget()
          scroll_widget.setLayout(inner_vbox)
          scroll = QScrollArea()
          scroll.setWidget(scroll_widget)
          scroll.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
          scroll.setWidgetResizable(True)
          icon_vbox = QVBoxLayout()
          icon_vbox.addWidget(self.logo)
          icon_vbox.addStretch(1)
          hbox = QHBoxLayout()
          hbox.addLayout(icon_vbox)
          hbox.addSpacing(5)
          hbox.addWidget(scroll)
          hbox.setStretchFactor(scroll, 1)
          outer_vbox.addLayout(hbox)
          outer_vbox.addLayout(Buttons(self.back_button, self.next_button))
          self.set_icon('electrum.png')
          self.show()
          self.raise_()
          self.refresh_gui()  # Need for QT on MacOSX.  Lame.
  
      def select_storage(self, path, get_wallet_from_daemon) -> Tuple[str, Optional[WalletStorage]]:
  
          vbox = QVBoxLayout()
          hbox = QHBoxLayout()
          hbox.addWidget(QLabel(_('Wallet') + ':'))
          name_e = QLineEdit()
          hbox.addWidget(name_e)
          button = QPushButton(_('Choose...'))
          hbox.addWidget(button)
          vbox.addLayout(hbox)
  
          msg_label = WWLabel('')
          vbox.addWidget(msg_label)
          hbox2 = QHBoxLayout()
          pw_e = PasswordLineEdit('', self)
          pw_e.setFixedWidth(17 * char_width_in_lineedit())
          pw_label = QLabel(_('Password') + ':')
          hbox2.addWidget(pw_label)
          hbox2.addWidget(pw_e)
          hbox2.addStretch()
          vbox.addLayout(hbox2)
  
          vbox.addSpacing(50)
          vbox_create_new = QVBoxLayout()
          vbox_create_new.addWidget(QLabel(_('Alternatively') + ':'), alignment=Qt.AlignLeft)
          button_create_new = QPushButton(_('Create New Wallet'))
          button_create_new.setMinimumWidth(120)
          vbox_create_new.addWidget(button_create_new, alignment=Qt.AlignLeft)
          widget_create_new = QWidget()
          widget_create_new.setLayout(vbox_create_new)
          vbox_create_new.setContentsMargins(0, 0, 0, 0)
          vbox.addWidget(widget_create_new)
  
          self.set_layout(vbox, title=_('Electrum wallet'))
  
          temp_storage = None  # type: Optional[WalletStorage]
          wallet_folder = os.path.dirname(path)
  
          def on_choose():
              path, __ = QFileDialog.getOpenFileName(self, "Select your wallet file", wallet_folder)
              if path:
                  name_e.setText(path)
  
          def on_filename(filename):
              # FIXME? "filename" might contain ".." (etc) and hence sketchy path traversals are possible
              nonlocal temp_storage
              temp_storage = None
              msg = None
              if filename:
                  path = os.path.join(wallet_folder, filename)
                  wallet_from_memory = get_wallet_from_daemon(path)
                  try:
                      if wallet_from_memory:
                          temp_storage = wallet_from_memory.storage  # type: Optional[WalletStorage]
                      else:
                          temp_storage = WalletStorage(path)
                  except (StorageReadWriteError, WalletFileException) as e:
                      msg = _('Cannot read file') + f'\n{repr(e)}'
                  except Exception as e:
                      self.logger.exception('')
                      msg = _('Cannot read file') + f'\n{repr(e)}'
              else:
                  msg = ""
              self.next_button.setEnabled(temp_storage is not None)
              user_needs_to_enter_password = False
              if temp_storage:
                  if not temp_storage.file_exists():
                      msg =_("This file does not exist.") + '\n' \
                            + _("Press 'Next' to create this wallet, or choose another file.")
                  elif not wallet_from_memory:
                      if temp_storage.is_encrypted_with_user_pw():
                          msg = _("This file is encrypted with a password.") + '\n' \
                                + _('Enter your password or choose another file.')
                          user_needs_to_enter_password = True
                      elif temp_storage.is_encrypted_with_hw_device():
                          msg = _("This file is encrypted using a hardware device.") + '\n' \
                                + _("Press 'Next' to choose device to decrypt.")
                      else:
                          msg = _("Press 'Next' to open this wallet.")
                  else:
                      msg = _("This file is already open in memory.") + "\n" \
                          + _("Press 'Next' to create/focus window.")
              if msg is None:
                  msg = _('Cannot read file')
              msg_label.setText(msg)
              widget_create_new.setVisible(bool(temp_storage and temp_storage.file_exists()))
              if user_needs_to_enter_password:
                  pw_label.show()
                  pw_e.show()
                  pw_e.setFocus()
              else:
                  pw_label.hide()
                  pw_e.hide()
  
          button.clicked.connect(on_choose)
          button_create_new.clicked.connect(
              partial(
                  name_e.setText,
                  get_new_wallet_name(wallet_folder)))
          name_e.textChanged.connect(on_filename)
          name_e.setText(os.path.basename(path))
  
          def run_user_interaction_loop():
              while True:
                  if self.loop.exec_() != 2:  # 2 = next
                      raise UserCancelled()
                  assert temp_storage
                  if temp_storage.file_exists() and not temp_storage.is_encrypted():
                      break
                  if not temp_storage.file_exists():
                      break
                  wallet_from_memory = get_wallet_from_daemon(temp_storage.path)
                  if wallet_from_memory:
                      raise WalletAlreadyOpenInMemory(wallet_from_memory)
                  if temp_storage.file_exists() and temp_storage.is_encrypted():
                      if temp_storage.is_encrypted_with_user_pw():
                          password = pw_e.text()
                          try:
                              temp_storage.decrypt(password)
                              break
                          except InvalidPassword as e:
                              self.show_message(title=_('Error'), msg=str(e))
                              continue
                          except BaseException as e:
                              self.logger.exception('')
                              self.show_message(title=_('Error'), msg=repr(e))
                              raise UserCancelled()
                      elif temp_storage.is_encrypted_with_hw_device():
                          try:
                              self.run('choose_hw_device', HWD_SETUP_DECRYPT_WALLET, storage=temp_storage)
                          except InvalidPassword as e:
                              self.show_message(title=_('Error'),
                                                msg=_('Failed to decrypt using this hardware device.') + '\n' +
                                                    _('If you use a passphrase, make sure it is correct.'))
                              self.reset_stack()
                              return self.select_storage(path, get_wallet_from_daemon)
                          except (UserCancelled, GoBack):
                              raise
                          except BaseException as e:
                              self.logger.exception('')
                              self.show_message(title=_('Error'), msg=repr(e))
                              raise UserCancelled()
                          if temp_storage.is_past_initial_decryption():
                              break
                          else:
                              raise UserCancelled()
                      else:
                          raise Exception('Unexpected encryption version')
  
          try:
              run_user_interaction_loop()
          finally:
              try:
                  pw_e.clear()
              except RuntimeError:  # wrapped C/C++ object has been deleted.
                  pass              # happens when decrypting with hw device
  
          return temp_storage.path, (temp_storage if temp_storage.file_exists() else None)
  
      def run_upgrades(self, storage: WalletStorage, db: 'WalletDB') -> None:
          path = storage.path
          if db.requires_split():
              self.hide()
              msg = _("The wallet '{}' contains multiple accounts, which are no longer supported since Electrum 2.7.\n\n"
                      "Do you want to split your wallet into multiple files?").format(path)
              if not self.question(msg):
                  return
              file_list = db.split_accounts(path)
              msg = _('Your accounts have been moved to') + ':\n' + '\n'.join(file_list) + '\n\n'+ _('Do you want to delete the old file') + ':\n' + path
              if self.question(msg):
                  os.remove(path)
                  self.show_warning(_('The file was removed'))
              # raise now, to avoid having the old storage opened
              raise UserCancelled()
  
          action = db.get_action()
          if action and db.requires_upgrade():
              raise WalletFileException('Incomplete wallet files cannot be upgraded.')
          if action:
              self.hide()
              msg = _("The file '{}' contains an incompletely created wallet.\n"
                      "Do you want to complete its creation now?").format(path)
              if not self.question(msg):
                  if self.question(_("Do you want to delete '{}'?").format(path)):
                      os.remove(path)
                      self.show_warning(_('The file was removed'))
                  return
              self.show()
              self.data = json.loads(storage.read())
              self.run(action)
              for k, v in self.data.items():
                  db.put(k, v)
              db.write(storage)
              return
  
          if db.requires_upgrade():
              self.upgrade_db(storage, db)
  
      def on_error(self, exc_info):
          if not isinstance(exc_info[1], UserCancelled):
              self.logger.error("on_error", exc_info=exc_info)
              self.show_error(str(exc_info[1]))
  
      def set_icon(self, filename):
          prior_filename, self.icon_filename = self.icon_filename, filename
          self.logo.setPixmap(QPixmap(icon_path(filename))
                              .scaledToWidth(60, mode=Qt.SmoothTransformation))
          return prior_filename
  
      def set_layout(self, layout, title=None, next_enabled=True):
          self.title.setText("<b>%s</b>"%title if title else "")
          self.title.setVisible(bool(title))
          # Get rid of any prior layout by assigning it to a temporary widget
          prior_layout = self.main_widget.layout()
          if prior_layout:
              QWidget().setLayout(prior_layout)
          self.main_widget.setLayout(layout)
          self.back_button.setEnabled(True)
          self.next_button.setEnabled(next_enabled)
          if next_enabled:
              self.next_button.setFocus()
          self.main_widget.setVisible(True)
          self.please_wait.setVisible(False)
  
      def exec_layout(self, layout, title=None, raise_on_cancel=True,
                          next_enabled=True, focused_widget=None):
          self.set_layout(layout, title, next_enabled)
          if focused_widget:
              focused_widget.setFocus()
          result = self.loop.exec_()
          if not result and raise_on_cancel:
              raise UserCancelled()
          if result == 1:
              raise GoBack from None
          self.title.setVisible(False)
          self.back_button.setEnabled(False)
          self.next_button.setEnabled(False)
          self.main_widget.setVisible(False)
          self.please_wait.setVisible(True)
          self.refresh_gui()
          return result
  
      def refresh_gui(self):
          # For some reason, to refresh the GUI this needs to be called twice
          self.app.processEvents()
          self.app.processEvents()
  
      def remove_from_recently_open(self, filename):
          self.config.remove_from_recently_open(filename)
  
      def text_input(self, title, message, is_valid, allow_multi=False):
          slayout = KeysLayout(parent=self, header_layout=message, is_valid=is_valid,
                               allow_multi=allow_multi, config=self.config)
          self.exec_layout(slayout, title, next_enabled=False)
          return slayout.get_text()
  
      def seed_input(self, title, message, is_seed, options):
          slayout = SeedLayout(
              title=message,
              is_seed=is_seed,
              options=options,
              parent=self,
              config=self.config,
          )
          self.exec_layout(slayout, title, next_enabled=False)
          return slayout.get_seed(), slayout.is_bip39, slayout.is_ext
  
      @wizard_dialog
      def add_xpub_dialog(self, title, message, is_valid, run_next, allow_multi=False, show_wif_help=False):
          header_layout = QHBoxLayout()
          label = WWLabel(message)
          label.setMinimumWidth(400)
          header_layout.addWidget(label)
          if show_wif_help:
              header_layout.addWidget(InfoButton(WIF_HELP_TEXT), alignment=Qt.AlignRight)
          return self.text_input(title, header_layout, is_valid, allow_multi)
  
      @wizard_dialog
      def add_cosigner_dialog(self, run_next, index, is_valid):
          title = _("Add Cosigner") + " %d"%index
          message = ' '.join([
              _('Please enter the master public key (xpub) of your cosigner.'),
              _('Enter their master private key (xprv) if you want to be able to sign for them.')
          ])
          return self.text_input(title, message, is_valid)
  
      @wizard_dialog
      def restore_seed_dialog(self, run_next, test):
          options = []
          if self.opt_ext:
              options.append('ext')
          if self.opt_bip39:
              options.append('bip39')
          title = _('Enter Seed')
          message = _('Please enter your seed phrase in order to restore your wallet.')
          return self.seed_input(title, message, test, options)
  
      @wizard_dialog
      def confirm_seed_dialog(self, run_next, seed, test):
          self.app.clipboard().clear()
          title = _('Confirm Seed')
          message = ' '.join([
              _('Your seed is important!'),
              _('If you lose your seed, your money will be permanently lost.'),
              _('To make sure that you have properly saved your seed, please retype it here.')
          ])
          seed, is_bip39, is_ext = self.seed_input(title, message, test, None)
          return seed
  
      @wizard_dialog
      def show_seed_dialog(self, run_next, seed_text):
          title = _("Your wallet generation seed is:")
          slayout = SeedLayout(
              seed=seed_text,
              title=title,
              msg=True,
              options=['ext'],
              config=self.config,
          )
          self.exec_layout(slayout)
          return slayout.is_ext
  
      def pw_layout(self, msg, kind, force_disable_encrypt_cb):
          pw_layout = PasswordLayout(
              msg=msg, kind=kind, OK_button=self.next_button,
              force_disable_encrypt_cb=force_disable_encrypt_cb)
          pw_layout.encrypt_cb.setChecked(True)
          try:
              self.exec_layout(pw_layout.layout(), focused_widget=pw_layout.new_pw)
              return pw_layout.new_password(), pw_layout.encrypt_cb.isChecked()
          finally:
              pw_layout.clear_password_fields()
  
      @wizard_dialog
      def request_password(self, run_next, force_disable_encrypt_cb=False):
          """Request the user enter a new password and confirm it.  Return
          the password or None for no password."""
          return self.pw_layout(MSG_ENTER_PASSWORD, PW_NEW, force_disable_encrypt_cb)
  
      @wizard_dialog
      def request_storage_encryption(self, run_next):
          playout = PasswordLayoutForHW(MSG_HW_STORAGE_ENCRYPTION)
          playout.encrypt_cb.setChecked(True)
          self.exec_layout(playout.layout())
          return playout.encrypt_cb.isChecked()
  
      @wizard_dialog
      def confirm_dialog(self, title, message, run_next):
          self.confirm(message, title)
  
      def confirm(self, message, title):
          label = WWLabel(message)
          vbox = QVBoxLayout()
          vbox.addWidget(label)
          self.exec_layout(vbox, title)
  
      @wizard_dialog
      def action_dialog(self, action, run_next):
          self.run(action)
  
      def terminate(self, **kwargs):
          self.accept_signal.emit()
  
      def waiting_dialog(self, task, msg, on_finished=None):
          label = WWLabel(msg)
          vbox = QVBoxLayout()
          vbox.addSpacing(100)
          label.setMinimumWidth(300)
          label.setAlignment(Qt.AlignCenter)
          vbox.addWidget(label)
          self.set_layout(vbox, next_enabled=False)
          self.back_button.setEnabled(False)
  
          t = threading.Thread(target=task)
          t.start()
          while True:
              t.join(1.0/60)
              if t.is_alive():
                  self.refresh_gui()
              else:
                  break
          if on_finished:
              on_finished()
  
      def run_task_without_blocking_gui(self, task, *, msg=None):
          assert self.gui_thread == threading.current_thread(), 'must be called from GUI thread'
          if msg is None:
              msg = _("Please wait...")
  
          exc = None  # type: Optional[Exception]
          res = None
          def task_wrapper():
              nonlocal exc
              nonlocal res
              try:
                  res = task()
              except Exception as e:
                  exc = e
          self.waiting_dialog(task_wrapper, msg=msg)
          if exc is None:
              return res
          else:
              raise exc
  
      @wizard_dialog
      def choice_dialog(self, title, message, choices, run_next):
          c_values = [x[0] for x in choices]
          c_titles = [x[1] for x in choices]
          clayout = ChoicesLayout(message, c_titles)
          vbox = QVBoxLayout()
          vbox.addLayout(clayout.layout())
          self.exec_layout(vbox, title)
          action = c_values[clayout.selected_index()]
          return action
  
      def query_choice(self, msg, choices):
          """called by hardware wallets"""
          clayout = ChoicesLayout(msg, choices)
          vbox = QVBoxLayout()
          vbox.addLayout(clayout.layout())
          self.exec_layout(vbox, '')
          return clayout.selected_index()
  
      @wizard_dialog
      def derivation_and_script_type_gui_specific_dialog(
              self,
              *,
              title: str,
              message1: str,
              choices: List[Tuple[str, str, str]],
              hide_choices: bool = False,
              message2: str,
              test_text: Callable[[str], int],
              run_next,
              default_choice_idx: int = 0,
              get_account_xpub=None,
      ) -> Tuple[str, str]:
          vbox = QVBoxLayout()
  
          if get_account_xpub:
              button = QPushButton(_("Detect Existing Accounts"))
              def on_account_select(account):
                  script_type = account["script_type"]
                  if script_type == "p2pkh":
                      script_type = "standard"
                  button_index = c_values.index(script_type)
                  button = clayout.group.buttons()[button_index]
                  button.setChecked(True)
                  line.setText(account["derivation_path"])
              button.clicked.connect(lambda: Bip39RecoveryDialog(self, get_account_xpub, on_account_select))
              vbox.addWidget(button, alignment=Qt.AlignLeft)
              vbox.addWidget(QLabel(_("Or")))
  
          c_values = [x[0] for x in choices]
          c_titles = [x[1] for x in choices]
          c_default_text = [x[2] for x in choices]
          def on_choice_click(clayout):
              idx = clayout.selected_index()
              line.setText(c_default_text[idx])
          clayout = ChoicesLayout(message1, c_titles, on_choice_click,
                                  checked_index=default_choice_idx)
          if not hide_choices:
              vbox.addLayout(clayout.layout())
  
          vbox.addWidget(WWLabel(message2))
  
          line = QLineEdit()
          def on_text_change(text):
              self.next_button.setEnabled(test_text(text))
          line.textEdited.connect(on_text_change)
          on_choice_click(clayout)  # set default text for "line"
          vbox.addWidget(line)
  
          self.exec_layout(vbox, title)
          choice = c_values[clayout.selected_index()]
          return str(line.text()), choice
  
      @wizard_dialog
      def line_dialog(self, run_next, title, message, default, test, warning='',
                      presets=(), warn_issue4566=False):
          vbox = QVBoxLayout()
          vbox.addWidget(WWLabel(message))
          line = QLineEdit()
          line.setText(default)
          def f(text):
              self.next_button.setEnabled(test(text))
              if warn_issue4566:
                  text_whitespace_normalised = ' '.join(text.split())
                  warn_issue4566_label.setVisible(text != text_whitespace_normalised)
          line.textEdited.connect(f)
          vbox.addWidget(line)
          vbox.addWidget(WWLabel(warning))
  
          warn_issue4566_label = WWLabel(MSG_PASSPHRASE_WARN_ISSUE4566)
          warn_issue4566_label.setVisible(False)
          vbox.addWidget(warn_issue4566_label)
  
          for preset in presets:
              button = QPushButton(preset[0])
              button.clicked.connect(lambda __, text=preset[1]: line.setText(text))
              button.setMinimumWidth(150)
              hbox = QHBoxLayout()
              hbox.addWidget(button, alignment=Qt.AlignCenter)
              vbox.addLayout(hbox)
  
          self.exec_layout(vbox, title, next_enabled=test(default))
          return line.text()
  
      @wizard_dialog
      def show_xpub_dialog(self, xpub, run_next):
          msg = ' '.join([
              _("Here is your master public key."),
              _("Please share it with your cosigners.")
          ])
          vbox = QVBoxLayout()
          layout = SeedLayout(
              xpub,
              title=msg,
              icon=False,
              for_seed_words=False,
              config=self.config,
          )
          vbox.addLayout(layout.layout())
          self.exec_layout(vbox, _('Master Public Key'))
          return None
  
      def init_network(self, network: 'Network'):
          message = _("Electrum communicates with remote servers to get "
                    "information about your transactions and addresses. The "
                    "servers all fulfill the same purpose only differing in "
                    "hardware. In most cases you simply want to let Electrum "
                    "pick one at random.  However if you prefer feel free to "
                    "select a server manually.")
          choices = [_("Auto connect"), _("Select server manually")]
          title = _("How do you want to connect to a server? ")
          clayout = ChoicesLayout(message, choices)
          self.back_button.setText(_('Cancel'))
          self.exec_layout(clayout.layout(), title)
          r = clayout.selected_index()
          if r == 1:
              nlayout = NetworkChoiceLayout(network, self.config, wizard=True)
              if self.exec_layout(nlayout.layout()):
                  nlayout.accept()
                  self.config.set_key('auto_connect', network.auto_connect, True)
          else:
              network.auto_connect = True
              self.config.set_key('auto_connect', True, True)
  
      @wizard_dialog
      def multisig_dialog(self, run_next):
          cw = CosignWidget(2, 2)
          m_edit = QSlider(Qt.Horizontal, self)
          n_edit = QSlider(Qt.Horizontal, self)
          n_edit.setMinimum(2)
          n_edit.setMaximum(15)
          m_edit.setMinimum(1)
          m_edit.setMaximum(2)
          n_edit.setValue(2)
          m_edit.setValue(2)
          n_label = QLabel()
          m_label = QLabel()
          grid = QGridLayout()
          grid.addWidget(n_label, 0, 0)
          grid.addWidget(n_edit, 0, 1)
          grid.addWidget(m_label, 1, 0)
          grid.addWidget(m_edit, 1, 1)
          def on_m(m):
              m_label.setText(_('Require {0} signatures').format(m))
              cw.set_m(m)
              backup_warning_label.setVisible(cw.m != cw.n)
          def on_n(n):
              n_label.setText(_('From {0} cosigners').format(n))
              cw.set_n(n)
              m_edit.setMaximum(n)
              backup_warning_label.setVisible(cw.m != cw.n)
          n_edit.valueChanged.connect(on_n)
          m_edit.valueChanged.connect(on_m)
          vbox = QVBoxLayout()
          vbox.addWidget(cw)
          vbox.addWidget(WWLabel(_("Choose the number of signatures needed to unlock funds in your wallet:")))
          vbox.addLayout(grid)
          vbox.addSpacing(2 * char_width_in_lineedit())
          backup_warning_label = WWLabel(_("Warning: to be able to restore a multisig wallet, "
                                           "you should include the master public key for each cosigner "
                                           "in all of your backups."))
          vbox.addWidget(backup_warning_label)
          on_n(2)
          on_m(2)
          self.exec_layout(vbox, _("Multi-Signature Wallet"))
          m = int(m_edit.value())
          n = int(n_edit.value())
          return (m, n)
  