text: #!/usr/bin/env python
  #
  # Electrum - lightweight Bitcoin client
  # Copyright (C) 2015 Thomas Voegtlin
  #
  # 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.
  
  from enum import IntEnum
  from typing import Sequence
  
  from PyQt5.QtCore import Qt, QItemSelectionModel
  from PyQt5.QtGui import QStandardItemModel, QStandardItem
  from PyQt5.QtWidgets import QAbstractItemView
  from PyQt5.QtWidgets import QMenu, QVBoxLayout, QTreeWidget, QTreeWidgetItem, QHeaderView
  
  from electrum_blk.i18n import _
  from electrum_blk.util import format_time
  from electrum_blk.invoices import Invoice, PR_UNPAID, PR_PAID, PR_INFLIGHT, PR_FAILED, PR_TYPE_ONCHAIN, PR_TYPE_LN
  from electrum_blk.lnutil import HtlcLog
  
  from .util import MyTreeView, read_QIcon, MySortModel, pr_icons
  from .util import CloseButton, Buttons
  from .util import WindowModalDialog
  
  
  
  ROLE_REQUEST_TYPE = Qt.UserRole
  ROLE_REQUEST_ID = Qt.UserRole + 1
  ROLE_SORT_ORDER = Qt.UserRole + 2
  
  
  class InvoiceList(MyTreeView):
  
      class Columns(IntEnum):
          DATE = 0
          DESCRIPTION = 1
          AMOUNT = 2
          STATUS = 3
  
      headers = {
          Columns.DATE: _('Date'),
          Columns.DESCRIPTION: _('Description'),
          Columns.AMOUNT: _('Amount'),
          Columns.STATUS: _('Status'),
      }
      filter_columns = [Columns.DATE, Columns.DESCRIPTION, Columns.AMOUNT]
  
      def __init__(self, parent):
          super().__init__(parent, self.create_menu,
                           stretch_column=self.Columns.DESCRIPTION)
          self.std_model = QStandardItemModel(self)
          self.proxy = MySortModel(self, sort_role=ROLE_SORT_ORDER)
          self.proxy.setSourceModel(self.std_model)
          self.setModel(self.proxy)
          self.setSortingEnabled(True)
          self.setSelectionMode(QAbstractItemView.ExtendedSelection)
          self.update()
  
      def update_item(self, key, invoice: Invoice):
          model = self.std_model
          for row in range(0, model.rowCount()):
              item = model.item(row, 0)
              if item.data(ROLE_REQUEST_ID) == key:
                  break
          else:
              return
          status_item = model.item(row, self.Columns.STATUS)
          status = self.parent.wallet.get_invoice_status(invoice)
          status_str = invoice.get_status_str(status)
          if self.parent.wallet.lnworker:
              log = self.parent.wallet.lnworker.logs.get(key)
              if log and status == PR_INFLIGHT:
                  status_str += '... (%d)'%len(log)
          status_item.setText(status_str)
          status_item.setIcon(read_QIcon(pr_icons.get(status)))
  
      def update(self):
          # not calling maybe_defer_update() as it interferes with conditional-visibility
          self.proxy.setDynamicSortFilter(False)  # temp. disable re-sorting after every change
          self.std_model.clear()
          self.update_headers(self.__class__.headers)
          for idx, item in enumerate(self.parent.wallet.get_unpaid_invoices()):
              key = self.parent.wallet.get_key_for_outgoing_invoice(item)
              if item.is_lightning():
                  icon_name = 'lightning.png'
              else:
                  icon_name = 'bitcoin.png'
                  if item.bip70:
                      icon_name = 'seal.png'
              status = self.parent.wallet.get_invoice_status(item)
              status_str = item.get_status_str(status)
              message = item.message
              amount = item.get_amount_sat()
              timestamp = item.time or 0
              date_str = format_time(timestamp) if timestamp else _('Unknown')
              amount_str = self.parent.format_amount(amount, whitespaces=True)
              labels = [date_str, message, amount_str, status_str]
              items = [QStandardItem(e) for e in labels]
              self.set_editability(items)
              items[self.Columns.DATE].setIcon(read_QIcon(icon_name))
              items[self.Columns.STATUS].setIcon(read_QIcon(pr_icons.get(status)))
              items[self.Columns.DATE].setData(key, role=ROLE_REQUEST_ID)
              items[self.Columns.DATE].setData(item.type, role=ROLE_REQUEST_TYPE)
              items[self.Columns.DATE].setData(timestamp, role=ROLE_SORT_ORDER)
              self.std_model.insertRow(idx, items)
          self.filter()
          self.proxy.setDynamicSortFilter(True)
          # sort requests by date
          self.sortByColumn(self.Columns.DATE, Qt.DescendingOrder)
          # hide list if empty
          if self.parent.isVisible():
              b = self.std_model.rowCount() > 0
              self.setVisible(b)
              self.parent.invoices_label.setVisible(b)
  
      def create_menu(self, position):
          wallet = self.parent.wallet
          items = self.selected_in_column(0)
          if len(items)>1:
              keys = [item.data(ROLE_REQUEST_ID) for item in items]
              invoices = [wallet.invoices.get(key) for key in keys]
              can_batch_pay = all([i.type == PR_TYPE_ONCHAIN and wallet.get_invoice_status(i) == PR_UNPAID for i in invoices])
              menu = QMenu(self)
              if can_batch_pay:
                  menu.addAction(_("Batch pay invoices") + "...", lambda: self.parent.pay_multiple_invoices(invoices))
              menu.addAction(_("Delete invoices"), lambda: self.parent.delete_invoices(keys))
              menu.exec_(self.viewport().mapToGlobal(position))
              return
          idx = self.indexAt(position)
          item = self.item_from_index(idx)
          item_col0 = self.item_from_index(idx.sibling(idx.row(), self.Columns.DATE))
          if not item or not item_col0:
              return
          key = item_col0.data(ROLE_REQUEST_ID)
          invoice = self.parent.wallet.get_invoice(key)
          menu = QMenu(self)
          self.add_copy_menu(menu, idx)
          if invoice.is_lightning():
              menu.addAction(_("Details"), lambda: self.parent.show_lightning_invoice(invoice))
          else:
              if len(invoice.outputs) == 1:
                  menu.addAction(_("Copy Address"), lambda: self.parent.do_copy(invoice.get_address(), title='Blackcoin Address'))
              menu.addAction(_("Details"), lambda: self.parent.show_onchain_invoice(invoice))
          status = wallet.get_invoice_status(invoice)
          if status == PR_UNPAID:
              menu.addAction(_("Pay") + "...", lambda: self.parent.do_pay_invoice(invoice))
          if status == PR_FAILED:
              menu.addAction(_("Retry"), lambda: self.parent.do_pay_invoice(invoice))
          if self.parent.wallet.lnworker:
              log = self.parent.wallet.lnworker.logs.get(key)
              if log:
                  menu.addAction(_("View log"), lambda: self.show_log(key, log))
          menu.addAction(_("Delete"), lambda: self.parent.delete_invoices([key]))
          menu.exec_(self.viewport().mapToGlobal(position))
  
      def show_log(self, key, log: Sequence[HtlcLog]):
          d = WindowModalDialog(self, _("Payment log"))
          d.setMinimumWidth(600)
          vbox = QVBoxLayout(d)
          log_w = QTreeWidget()
          log_w.setHeaderLabels([_('Hops'), _('Channel ID'), _('Message')])
          log_w.header().setSectionResizeMode(2, QHeaderView.Stretch)
          log_w.header().setSectionResizeMode(1, QHeaderView.ResizeToContents)
          for payment_attempt_log in log:
              route_str, chan_str, message = payment_attempt_log.formatted_tuple()
              x = QTreeWidgetItem([route_str, chan_str, message])
              log_w.addTopLevelItem(x)
          vbox.addWidget(log_w)
          vbox.addLayout(Buttons(CloseButton(d)))
          d.exec_()
  