text: import tty
  import sys
  import curses
  import datetime
  import locale
  from decimal import Decimal
  import getpass
  import logging
  
  import electrum_vestx
  from electrum_vestx.util import format_satoshis
  from electrum_vestx.bitcoin import is_address, COIN, TYPE_ADDRESS
  from electrum_vestx.transaction import TxOutput
  from electrum_vestx.wallet import Wallet
  from electrum_vestx.storage import WalletStorage
  from electrum_vestx.network import NetworkParameters, TxBroadcastError, BestEffortRequestFailed
  from electrum_vestx.interface import deserialize_server
  from electrum_vestx.logging import console_stderr_handler
  
  _ = lambda x:x  # i18n
  
  
  class ElectrumGui:
  
      def __init__(self, config, daemon, plugins):
  
          self.config = config
          self.network = daemon.network
          storage = WalletStorage(config.get_wallet_path())
          if not storage.file_exists():
              print("Wallet not found. try 'electrum create'")
              exit()
          if storage.is_encrypted():
              password = getpass.getpass('Password:', stream=None)
              storage.decrypt(password)
          self.wallet = Wallet(storage)
          self.wallet.start_network(self.network)
          self.contacts = self.wallet.contacts
  
          locale.setlocale(locale.LC_ALL, '')
          self.encoding = locale.getpreferredencoding()
  
          self.stdscr = curses.initscr()
          curses.noecho()
          curses.cbreak()
          curses.start_color()
          curses.use_default_colors()
          curses.init_pair(1, curses.COLOR_WHITE, curses.COLOR_BLUE)
          curses.init_pair(2, curses.COLOR_WHITE, curses.COLOR_CYAN)
          curses.init_pair(3, curses.COLOR_BLACK, curses.COLOR_WHITE)
          self.stdscr.keypad(1)
          self.stdscr.border(0)
          self.maxy, self.maxx = self.stdscr.getmaxyx()
          self.set_cursor(0)
          self.w = curses.newwin(10, 50, 5, 5)
  
          console_stderr_handler.setLevel(logging.CRITICAL)
          self.tab = 0
          self.pos = 0
          self.popup_pos = 0
  
          self.str_recipient = ""
          self.str_description = ""
          self.str_amount = ""
          self.str_fee = ""
          self.history = None
  
          if self.network:
              self.network.register_callback(self.update, ['wallet_updated', 'network_updated'])
  
          self.tab_names = [_("History"), _("Send"), _("Receive"), _("Addresses"), _("Contacts"), _("Banner")]
          self.num_tabs = len(self.tab_names)
  
  
      def set_cursor(self, x):
          try:
              curses.curs_set(x)
          except Exception:
              pass
  
      def restore_or_create(self):
          pass
  
      def verify_seed(self):
          pass
  
      def get_string(self, y, x):
          self.set_cursor(1)
          curses.echo()
          self.stdscr.addstr( y, x, " "*20, curses.A_REVERSE)
          s = self.stdscr.getstr(y,x)
          curses.noecho()
          self.set_cursor(0)
          return s
  
      def update(self, event, *args):
          self.update_history()
          if self.tab == 0:
              self.print_history()
          self.refresh()
  
      def print_history(self):
  
          width = [20, 40, 14, 14]
          delta = (self.maxx - sum(width) - 4)/3
          format_str = "%"+"%d"%width[0]+"s"+"%"+"%d"%(width[1]+delta)+"s"+"%"+"%d"%(width[2]+delta)+"s"+"%"+"%d"%(width[3]+delta)+"s"
  
          if self.history is None:
              self.update_history()
  
          self.print_list(self.history[::-1], format_str%( _("Date"), _("Description"), _("Amount"), _("Balance")))
  
      def update_history(self):
          width = [20, 40, 14, 14]
          delta = (self.maxx - sum(width) - 4)/3
          format_str = "%"+"%d"%width[0]+"s"+"%"+"%d"%(width[1]+delta)+"s"+"%"+"%d"%(width[2]+delta)+"s"+"%"+"%d"%(width[3]+delta)+"s"
  
          b = 0
          self.history = []
          for tx_hash, tx_mined_status, value, balance in self.wallet.get_history():
              if tx_mined_status.conf:
                  timestamp = tx_mined_status.timestamp
                  try:
                      time_str = datetime.datetime.fromtimestamp(timestamp).isoformat(' ')[:-3]
                  except Exception:
                      time_str = "------"
              else:
                  time_str = 'unconfirmed'
  
              label = self.wallet.get_label(tx_hash)
              if len(label) > 40:
                  label = label[0:37] + '...'
              self.history.append( format_str%( time_str, label, format_satoshis(value, whitespaces=True), format_satoshis(balance, whitespaces=True) ) )
  
  
      def print_balance(self):
          if not self.network:
              msg = _("Offline")
          elif self.network.is_connected():
              if not self.wallet.up_to_date:
                  msg = _("Synchronizing...")
              else:
                  c, u, x =  self.wallet.get_balance()
                  msg = _("Balance")+": %f  "%(Decimal(c) / COIN)
                  if u:
                      msg += "  [%f unconfirmed]"%(Decimal(u) / COIN)
                  if x:
                      msg += "  [%f unmatured]"%(Decimal(x) / COIN)
          else:
              msg = _("Not connected")
  
          self.stdscr.addstr( self.maxy -1, 3, msg)
  
          for i in range(self.num_tabs):
              self.stdscr.addstr( 0, 2 + 2*i + len(''.join(self.tab_names[0:i])), ' '+self.tab_names[i]+' ', curses.A_BOLD if self.tab == i else 0)
  
          self.stdscr.addstr(self.maxy -1, self.maxx-30, ' '.join([_("Settings"), _("Network"), _("Quit")]))
  
      def print_receive(self):
          addr = self.wallet.get_receiving_address()
          self.stdscr.addstr(2, 1, "Address: "+addr)
          self.print_qr(addr)
  
      def print_contacts(self):
          messages = map(lambda x: "%20s   %45s "%(x[0], x[1][1]), self.contacts.items())
          self.print_list(messages, "%19s  %15s "%("Key", "Value"))
  
      def print_addresses(self):
          fmt = "%-35s  %-30s"
          messages = map(lambda addr: fmt % (addr, self.wallet.labels.get(addr,"")), self.wallet.get_addresses())
          self.print_list(messages,   fmt % ("Address", "Label"))
  
      def print_edit_line(self, y, label, text, index, size):
          text += " "*(size - len(text) )
          self.stdscr.addstr( y, 2, label)
          self.stdscr.addstr( y, 15, text, curses.A_REVERSE if self.pos%6==index else curses.color_pair(1))
  
      def print_send_tab(self):
          self.stdscr.clear()
          self.print_edit_line(3, _("Pay to"), self.str_recipient, 0, 40)
          self.print_edit_line(5, _("Description"), self.str_description, 1, 40)
          self.print_edit_line(7, _("Amount"), self.str_amount, 2, 15)
          self.print_edit_line(9, _("Fee"), self.str_fee, 3, 15)
          self.stdscr.addstr( 12, 15, _("[Send]"), curses.A_REVERSE if self.pos%6==4 else curses.color_pair(2))
          self.stdscr.addstr( 12, 25, _("[Clear]"), curses.A_REVERSE if self.pos%6==5 else curses.color_pair(2))
          self.maxpos = 6
  
      def print_banner(self):
          if self.network and self.network.banner:
              banner = self.network.banner
              banner = banner.replace('\r', '')
              self.print_list(banner.split('\n'))
  
      def print_qr(self, data):
          import qrcode
          try:
              from StringIO import StringIO
          except ImportError:
              from io import StringIO
  
          s = StringIO()
          self.qr = qrcode.QRCode()
          self.qr.add_data(data)
          self.qr.print_ascii(out=s, invert=False)
          msg = s.getvalue()
          lines = msg.split('\n')
          try:
              for i, l in enumerate(lines):
                  l = l.encode("utf-8")
                  self.stdscr.addstr(i+5, 5, l, curses.color_pair(3))
          except curses.error:
              m = 'error. screen too small?'
              m = m.encode(self.encoding)
              self.stdscr.addstr(5, 1, m, 0)
  
  
      def print_list(self, lst, firstline = None):
          lst = list(lst)
          self.maxpos = len(lst)
          if not self.maxpos: return
          if firstline:
              firstline += " "*(self.maxx -2 - len(firstline))
              self.stdscr.addstr( 1, 1, firstline )
          for i in range(self.maxy-4):
              msg = lst[i] if i < len(lst) else ""
              msg += " "*(self.maxx - 2 - len(msg))
              m = msg[0:self.maxx - 2]
              m = m.encode(self.encoding)
              self.stdscr.addstr( i+2, 1, m, curses.A_REVERSE if i == (self.pos % self.maxpos) else 0)
  
      def refresh(self):
          if self.tab == -1: return
          self.stdscr.border(0)
          self.print_balance()
          self.stdscr.refresh()
  
      def main_command(self):
          c = self.stdscr.getch()
          print(c)
          cc = curses.unctrl(c).decode()
          if   c == curses.KEY_RIGHT: self.tab = (self.tab + 1)%self.num_tabs
          elif c == curses.KEY_LEFT: self.tab = (self.tab - 1)%self.num_tabs
          elif c == curses.KEY_DOWN: self.pos +=1
          elif c == curses.KEY_UP: self.pos -= 1
          elif c == 9: self.pos +=1 # tab
          elif cc in ['^W', '^C', '^X', '^Q']: self.tab = -1
          elif cc in ['^N']: self.network_dialog()
          elif cc == '^S': self.settings_dialog()
          else: return c
          if self.pos<0: self.pos=0
          if self.pos>=self.maxpos: self.pos=self.maxpos - 1
  
      def run_tab(self, i, print_func, exec_func):
          while self.tab == i:
              self.stdscr.clear()
              print_func()
              self.refresh()
              c = self.main_command()
              if c: exec_func(c)
  
  
      def run_history_tab(self, c):
          if c == 10:
              out = self.run_popup('',["blah","foo"])
  
  
      def edit_str(self, target, c, is_num=False):
          # detect backspace
          cc = curses.unctrl(c).decode()
          if c in [8, 127, 263] and target:
              target = target[:-1]
          elif not is_num or cc in '0123456789.':
              target += cc
          return target
  
  
      def run_send_tab(self, c):
          if self.pos%6 == 0:
              self.str_recipient = self.edit_str(self.str_recipient, c)
          if self.pos%6 == 1:
              self.str_description = self.edit_str(self.str_description, c)
          if self.pos%6 == 2:
              self.str_amount = self.edit_str(self.str_amount, c, True)
          elif self.pos%6 == 3:
              self.str_fee = self.edit_str(self.str_fee, c, True)
          elif self.pos%6==4:
              if c == 10: self.do_send()
          elif self.pos%6==5:
              if c == 10: self.do_clear()
  
  
      def run_receive_tab(self, c):
          if c == 10:
              out = self.run_popup('Address', ["Edit label", "Freeze", "Prioritize"])
  
      def run_contacts_tab(self, c):
          if c == 10 and self.contacts:
              out = self.run_popup('Address', ["Copy", "Pay to", "Edit label", "Delete"]).get('button')
              key = list(self.contacts.keys())[self.pos%len(self.contacts.keys())]
              if out == "Pay to":
                  self.tab = 1
                  self.str_recipient = key
                  self.pos = 2
              elif out == "Edit label":
                  s = self.get_string(6 + self.pos, 18)
                  if s:
                      self.wallet.labels[key] = s
  
      def run_banner_tab(self, c):
          self.show_message(repr(c))
          pass
  
      def main(self):
  
          tty.setraw(sys.stdin)
          try:
              while self.tab != -1:
                  self.run_tab(0, self.print_history, self.run_history_tab)
                  self.run_tab(1, self.print_send_tab, self.run_send_tab)
                  self.run_tab(2, self.print_receive, self.run_receive_tab)
                  self.run_tab(3, self.print_addresses, self.run_banner_tab)
                  self.run_tab(4, self.print_contacts, self.run_contacts_tab)
                  self.run_tab(5, self.print_banner, self.run_banner_tab)
          except curses.error as e:
              raise Exception("Error with curses. Is your screen too small?") from e
          finally:
              tty.setcbreak(sys.stdin)
              curses.nocbreak()
              self.stdscr.keypad(0)
              curses.echo()
              curses.endwin()
  
  
      def do_clear(self):
          self.str_amount = ''
          self.str_recipient = ''
          self.str_fee = ''
          self.str_description = ''
  
      def do_send(self):
          if not is_address(self.str_recipient):
              self.show_message(_('Invalid Bitcoin address'))
              return
          try:
              amount = int(Decimal(self.str_amount) * COIN)
          except Exception:
              self.show_message(_('Invalid Amount'))
              return
          try:
              fee = int(Decimal(self.str_fee) * COIN)
          except Exception:
              self.show_message(_('Invalid Fee'))
              return
  
          if self.wallet.has_password():
              password = self.password_dialog()
              if not password:
                  return
          else:
              password = None
          try:
              tx = self.wallet.mktx([TxOutput(TYPE_ADDRESS, self.str_recipient, amount)],
                                    password, self.config, fee)
          except Exception as e:
              self.show_message(str(e))
              return
  
          if self.str_description:
              self.wallet.labels[tx.txid()] = self.str_description
  
          self.show_message(_("Please wait..."), getchar=False)
          try:
              self.network.run_from_another_thread(self.network.broadcast_transaction(tx))
          except TxBroadcastError as e:
              msg = e.get_message_for_gui()
              self.show_message(msg)
          except BestEffortRequestFailed as e:
              msg = repr(e)
              self.show_message(msg)
          else:
              self.show_message(_('Payment sent.'))
              self.do_clear()
              #self.update_contacts_tab()
  
      def show_message(self, message, getchar = True):
          w = self.w
          w.clear()
          w.border(0)
          for i, line in enumerate(message.split('\n')):
              w.addstr(2+i,2,line)
          w.refresh()
          if getchar: c = self.stdscr.getch()
  
      def run_popup(self, title, items):
          return self.run_dialog(title, list(map(lambda x: {'type':'button','label':x}, items)), interval=1, y_pos = self.pos+3)
  
      def network_dialog(self):
          if not self.network:
              return
          net_params = self.network.get_parameters()
          host, port, protocol = net_params.host, net_params.port, net_params.protocol
          proxy_config, auto_connect = net_params.proxy, net_params.auto_connect
          srv = 'auto-connect' if auto_connect else self.network.default_server
          out = self.run_dialog('Network', [
              {'label':'server', 'type':'str', 'value':srv},
              {'label':'proxy', 'type':'str', 'value':self.config.get('proxy', '')},
              ], buttons = 1)
          if out:
              if out.get('server'):
                  server = out.get('server')
                  auto_connect = server == 'auto-connect'
                  if not auto_connect:
                      try:
                          host, port, protocol = deserialize_server(server)
                      except Exception:
                          self.show_message("Error:" + server + "\nIn doubt, type \"auto-connect\"")
                          return False
              if out.get('server') or out.get('proxy'):
                  proxy = electrum_vestx.network.deserialize_proxy(out.get('proxy')) if out.get('proxy') else proxy_config
                  net_params = NetworkParameters(host, port, protocol, proxy, auto_connect)
                  self.network.run_from_another_thread(self.network.set_parameters(net_params))
  
      def settings_dialog(self):
          fee = str(Decimal(self.config.fee_per_kb()) / COIN)
          out = self.run_dialog('Settings', [
              {'label':'Default fee', 'type':'satoshis', 'value': fee }
              ], buttons = 1)
          if out:
              if out.get('Default fee'):
                  fee = int(Decimal(out['Default fee']) * COIN)
                  self.config.set_key('fee_per_kb', fee, True)
  
  
      def password_dialog(self):
          out = self.run_dialog('Password', [
              {'label':'Password', 'type':'password', 'value':''}
              ], buttons = 1)
          return out.get('Password')
  
  
      def run_dialog(self, title, items, interval=2, buttons=None, y_pos=3):
          self.popup_pos = 0
  
          self.w = curses.newwin( 5 + len(list(items))*interval + (2 if buttons else 0), 50, y_pos, 5)
          w = self.w
          out = {}
          while True:
              w.clear()
              w.border(0)
              w.addstr( 0, 2, title)
  
              num = len(list(items))
  
              numpos = num
              if buttons: numpos += 2
  
              for i in range(num):
                  item = items[i]
                  label = item.get('label')
                  if item.get('type') == 'list':
                      value = item.get('value','')
                  elif item.get('type') == 'satoshis':
                      value = item.get('value','')
                  elif item.get('type') == 'str':
                      value = item.get('value','')
                  elif item.get('type') == 'password':
                      value = '*'*len(item.get('value',''))
                  else:
                      value = ''
                  if value is None:
                      value = ''
                  if len(value)<20:
                      value += ' '*(20-len(value))
  
                  if 'value' in item:
                      w.addstr( 2+interval*i, 2, label)
                      w.addstr( 2+interval*i, 15, value, curses.A_REVERSE if self.popup_pos%numpos==i else curses.color_pair(1) )
                  else:
                      w.addstr( 2+interval*i, 2, label, curses.A_REVERSE if self.popup_pos%numpos==i else 0)
  
              if buttons:
                  w.addstr( 5+interval*i, 10, "[  ok  ]", curses.A_REVERSE if self.popup_pos%numpos==(numpos-2) else curses.color_pair(2))
                  w.addstr( 5+interval*i, 25, "[cancel]", curses.A_REVERSE if self.popup_pos%numpos==(numpos-1) else curses.color_pair(2))
  
              w.refresh()
  
              c = self.stdscr.getch()
              if c in [ord('q'), 27]: break
              elif c in [curses.KEY_LEFT, curses.KEY_UP]: self.popup_pos -= 1
              elif c in [curses.KEY_RIGHT, curses.KEY_DOWN]: self.popup_pos +=1
              else:
                  i = self.popup_pos%numpos
                  if buttons and c==10:
                      if i == numpos-2:
                          return out
                      elif i == numpos -1:
                          return {}
  
                  item = items[i]
                  _type = item.get('type')
  
                  if _type == 'str':
                      item['value'] = self.edit_str(item['value'], c)
                      out[item.get('label')] = item.get('value')
  
                  elif _type == 'password':
                      item['value'] = self.edit_str(item['value'], c)
                      out[item.get('label')] = item ['value']
  
                  elif _type == 'satoshis':
                      item['value'] = self.edit_str(item['value'], c, True)
                      out[item.get('label')] = item.get('value')
  
                  elif _type == 'list':
                      choices = item.get('choices')
                      try:
                          j = choices.index(item.get('value'))
                      except Exception:
                          j = 0
                      new_choice = choices[(j + 1)% len(choices)]
                      item['value'] = new_choice
                      out[item.get('label')] = item.get('value')
  
                  elif _type == 'button':
                      out['button'] = item.get('label')
                      break
  
          return out
  