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.
  
  import webbrowser
  import datetime
  
  from electrum_ltc.wallet import AddTransactionException, TX_HEIGHT_LOCAL
  from .util import *
  from electrum_ltc.i18n import _
  from electrum_ltc.util import block_explorer_URL, profiler
  
  try:
      from electrum_ltc.plot import plot_history, NothingToPlotException
  except:
      plot_history = None
  
  # note: this list needs to be kept in sync with another in kivy
  TX_ICONS = [
      "unconfirmed.png",
      "warning.png",
      "unconfirmed.png",
      "offline_tx.png",
      "clock1.png",
      "clock2.png",
      "clock3.png",
      "clock4.png",
      "clock5.png",
      "confirmed.png",
  ]
  
  
  class HistoryList(MyTreeWidget, AcceptFileDragDrop):
      filter_columns = [2, 3, 4]  # Date, Description, Amount
  
      def __init__(self, parent=None):
          MyTreeWidget.__init__(self, parent, self.create_menu, [], 3)
          AcceptFileDragDrop.__init__(self, ".txn")
          self.refresh_headers()
          self.setColumnHidden(1, True)
          self.setSortingEnabled(True)
          self.sortByColumn(0, Qt.AscendingOrder)
          self.start_timestamp = None
          self.end_timestamp = None
          self.years = []
          self.create_toolbar_buttons()
          self.wallet = None
  
      def format_date(self, d):
          return str(datetime.date(d.year, d.month, d.day)) if d else _('None')
  
      def refresh_headers(self):
          headers = ['', '', _('Date'), _('Description'), _('Amount'), _('Balance')]
          fx = self.parent.fx
          if fx and fx.show_history():
              headers.extend(['%s '%fx.ccy + _('Value')])
              self.editable_columns |= {6}
              if fx.get_history_capital_gains_config():
                  headers.extend(['%s '%fx.ccy + _('Acquisition price')])
                  headers.extend(['%s '%fx.ccy + _('Capital Gains')])
          else:
              self.editable_columns -= {6}
          self.update_headers(headers)
  
      def get_domain(self):
          '''Replaced in address_dialog.py'''
          return self.wallet.get_addresses()
  
      def on_combo(self, x):
          s = self.period_combo.itemText(x)
          x = s == _('Custom')
          self.start_button.setEnabled(x)
          self.end_button.setEnabled(x)
          if s == _('All'):
              self.start_timestamp = None
              self.end_timestamp = None
              self.start_button.setText("-")
              self.end_button.setText("-")
          else:
              try:
                  year = int(s)
              except:
                  return
              start_date = datetime.datetime(year, 1, 1)
              end_date = datetime.datetime(year+1, 1, 1)
              self.start_timestamp = time.mktime(start_date.timetuple())
              self.end_timestamp = time.mktime(end_date.timetuple())
              self.start_button.setText(_('From') + ' ' + self.format_date(start_date))
              self.end_button.setText(_('To') + ' ' + self.format_date(end_date))
          self.update()
  
      def create_toolbar_buttons(self):
          self.period_combo = QComboBox()
          self.start_button = QPushButton('-')
          self.start_button.pressed.connect(self.select_start_date)
          self.start_button.setEnabled(False)
          self.end_button = QPushButton('-')
          self.end_button.pressed.connect(self.select_end_date)
          self.end_button.setEnabled(False)
          self.period_combo.addItems([_('All'), _('Custom')])
          self.period_combo.activated.connect(self.on_combo)
  
      def get_toolbar_buttons(self):
          return self.period_combo, self.start_button, self.end_button
  
      def on_hide_toolbar(self):
          self.start_timestamp = None
          self.end_timestamp = None
          self.update()
  
      def save_toolbar_state(self, state, config):
          config.set_key('show_toolbar_history', state)
  
      def select_start_date(self):
          self.start_timestamp = self.select_date(self.start_button)
          self.update()
  
      def select_end_date(self):
          self.end_timestamp = self.select_date(self.end_button)
          self.update()
  
      def select_date(self, button):
          d = WindowModalDialog(self, _("Select date"))
          d.setMinimumSize(600, 150)
          d.date = None
          vbox = QVBoxLayout()
          def on_date(date):
              d.date = date
          cal = QCalendarWidget()
          cal.setGridVisible(True)
          cal.clicked[QDate].connect(on_date)
          vbox.addWidget(cal)
          vbox.addLayout(Buttons(OkButton(d), CancelButton(d)))
          d.setLayout(vbox)
          if d.exec_():
              if d.date is None:
                  return None
              date = d.date.toPyDate()
              button.setText(self.format_date(date))
              return time.mktime(date.timetuple())
  
      def show_summary(self):
          h = self.summary
          if not h:
              self.parent.show_message(_("Nothing to summarize."))
              return
          start_date = h.get('start_date')
          end_date = h.get('end_date')
          format_amount = lambda x: self.parent.format_amount(x.value) + ' ' + self.parent.base_unit()
          d = WindowModalDialog(self, _("Summary"))
          d.setMinimumSize(600, 150)
          vbox = QVBoxLayout()
          grid = QGridLayout()
          grid.addWidget(QLabel(_("Start")), 0, 0)
          grid.addWidget(QLabel(self.format_date(start_date)), 0, 1)
          grid.addWidget(QLabel(str(h.get('start_fiat_value')) + '/LTC'), 0, 2)
          grid.addWidget(QLabel(_("Initial balance")), 1, 0)
          grid.addWidget(QLabel(format_amount(h['start_balance'])), 1, 1)
          grid.addWidget(QLabel(str(h.get('start_fiat_balance'))), 1, 2)
          grid.addWidget(QLabel(_("End")), 2, 0)
          grid.addWidget(QLabel(self.format_date(end_date)), 2, 1)
          grid.addWidget(QLabel(str(h.get('end_fiat_value')) + '/LTC'), 2, 2)
          grid.addWidget(QLabel(_("Final balance")), 4, 0)
          grid.addWidget(QLabel(format_amount(h['end_balance'])), 4, 1)
          grid.addWidget(QLabel(str(h.get('end_fiat_balance'))), 4, 2)
          grid.addWidget(QLabel(_("Income")), 5, 0)
          grid.addWidget(QLabel(format_amount(h.get('income'))), 5, 1)
          grid.addWidget(QLabel(str(h.get('fiat_income'))), 5, 2)
          grid.addWidget(QLabel(_("Expenditures")), 6, 0)
          grid.addWidget(QLabel(format_amount(h.get('expenditures'))), 6, 1)
          grid.addWidget(QLabel(str(h.get('fiat_expenditures'))), 6, 2)
          grid.addWidget(QLabel(_("Capital gains")), 7, 0)
          grid.addWidget(QLabel(str(h.get('capital_gains'))), 7, 2)
          grid.addWidget(QLabel(_("Unrealized gains")), 8, 0)
          grid.addWidget(QLabel(str(h.get('unrealized_gains', ''))), 8, 2)
          vbox.addLayout(grid)
          vbox.addLayout(Buttons(CloseButton(d)))
          d.setLayout(vbox)
          d.exec_()
  
      def plot_history_dialog(self):
          if plot_history is None:
              self.parent.show_message(
                  _("Can't plot history.") + '\n' +
                  _("Perhaps some dependencies are missing...") + " (matplotlib?)")
              return
          try:
              plt = plot_history(self.transactions)
              plt.show()
          except NothingToPlotException as e:
              self.parent.show_message(str(e))
  
      @profiler
      def on_update(self):
          self.wallet = self.parent.wallet
          fx = self.parent.fx
          r = self.wallet.get_full_history(domain=self.get_domain(), from_timestamp=self.start_timestamp, to_timestamp=self.end_timestamp, fx=fx)
          self.transactions = r['transactions']
          self.summary = r['summary']
          if not self.years and self.transactions:
              from datetime import date
              start_date = self.transactions[0].get('date') or date.today()
              end_date = self.transactions[-1].get('date') or date.today()
              self.years = [str(i) for i in range(start_date.year, end_date.year + 1)]
              self.period_combo.insertItems(1, self.years)
          item = self.currentItem()
          current_tx = item.data(0, Qt.UserRole) if item else None
          self.clear()
          if fx: fx.history_used_spot = False
          for tx_item in self.transactions:
              tx_hash = tx_item['txid']
              height = tx_item['height']
              conf = tx_item['confirmations']
              timestamp = tx_item['timestamp']
              value = tx_item['value'].value
              balance = tx_item['balance'].value
              label = tx_item['label']
              status, status_str = self.wallet.get_tx_status(tx_hash, height, conf, timestamp)
              has_invoice = self.wallet.invoices.paid.get(tx_hash)
              icon = self.icon_cache.get(":icons/" + TX_ICONS[status])
              v_str = self.parent.format_amount(value, is_diff=True, whitespaces=True)
              balance_str = self.parent.format_amount(balance, whitespaces=True)
              entry = ['', tx_hash, status_str, label, v_str, balance_str]
              fiat_value = None
              if value is not None and fx and fx.show_history():
                  fiat_value = tx_item['fiat_value'].value
                  value_str = fx.format_fiat(fiat_value)
                  entry.append(value_str)
                  # fixme: should use is_mine
                  if value < 0:
                      entry.append(fx.format_fiat(tx_item['acquisition_price'].value))
                      entry.append(fx.format_fiat(tx_item['capital_gain'].value))
              item = SortableTreeWidgetItem(entry)
              item.setIcon(0, icon)
              item.setToolTip(0, str(conf) + " confirmation" + ("s" if conf != 1 else ""))
              item.setData(0, SortableTreeWidgetItem.DataRole, (status, conf))
              if has_invoice:
                  item.setIcon(3, self.icon_cache.get(":icons/seal"))
              for i in range(len(entry)):
                  if i>3:
                      item.setTextAlignment(i, Qt.AlignRight | Qt.AlignVCenter)
                  if i!=2:
                      item.setFont(i, QFont(MONOSPACE_FONT))
              if value and value < 0:
                  item.setForeground(3, QBrush(QColor("#BC1E1E")))
                  item.setForeground(4, QBrush(QColor("#BC1E1E")))
              if fiat_value and not tx_item['fiat_default']:
                  item.setForeground(6, QBrush(QColor("#1E1EFF")))
              if tx_hash:
                  item.setData(0, Qt.UserRole, tx_hash)
              self.insertTopLevelItem(0, item)
              if current_tx == tx_hash:
                  self.setCurrentItem(item)
  
      def on_edited(self, item, column, prior):
          '''Called only when the text actually changes'''
          key = item.data(0, Qt.UserRole)
          text = item.text(column)
          # fixme
          if column == 3:
              self.parent.wallet.set_label(key, text)
              self.update_labels()
              self.parent.update_completions()
          elif column == 6:
              self.parent.wallet.set_fiat_value(key, self.parent.fx.ccy, text)
              self.on_update()
  
      def on_doubleclick(self, item, column):
          if self.permit_edit(item, column):
              super(HistoryList, self).on_doubleclick(item, column)
          else:
              tx_hash = item.data(0, Qt.UserRole)
              tx = self.wallet.transactions.get(tx_hash)
              self.parent.show_transaction(tx)
  
      def update_labels(self):
          root = self.invisibleRootItem()
          child_count = root.childCount()
          for i in range(child_count):
              item = root.child(i)
              txid = item.data(0, Qt.UserRole)
              label = self.wallet.get_label(txid)
              item.setText(3, label)
  
      def update_item(self, tx_hash, height, conf, timestamp):
          if self.wallet is None:
              return
          status, status_str = self.wallet.get_tx_status(tx_hash, height, conf, timestamp)
          icon = self.icon_cache.get(":icons/" +  TX_ICONS[status])
          items = self.findItems(tx_hash, Qt.UserRole|Qt.MatchContains|Qt.MatchRecursive, column=1)
          if items:
              item = items[0]
              item.setIcon(0, icon)
              item.setData(0, SortableTreeWidgetItem.DataRole, (status, conf))
              item.setText(2, status_str)
  
      def create_menu(self, position):
          self.selectedIndexes()
          item = self.currentItem()
          if not item:
              return
          column = self.currentColumn()
          tx_hash = item.data(0, Qt.UserRole)
          if not tx_hash:
              return
          if column is 0:
              column_title = "ID"
              column_data = tx_hash
          else:
              column_title = self.headerItem().text(column)
              column_data = item.text(column)
          tx_URL = block_explorer_URL(self.config, 'tx', tx_hash)
          height, conf, timestamp = self.wallet.get_tx_height(tx_hash)
          tx = self.wallet.transactions.get(tx_hash)
          is_relevant, is_mine, v, fee = self.wallet.get_wallet_delta(tx)
          is_unconfirmed = height <= 0
          pr_key = self.wallet.invoices.paid.get(tx_hash)
          menu = QMenu()
          if height == TX_HEIGHT_LOCAL:
              menu.addAction(_("Remove"), lambda: self.remove_local_tx(tx_hash))
          menu.addAction(_("Copy {}").format(column_title), lambda: self.parent.app.clipboard().setText(column_data))
          for c in self.editable_columns:
              menu.addAction(_("Edit {}").format(self.headerItem().text(c)),
                             lambda bound_c=c: self.editItem(item, bound_c))
          menu.addAction(_("Details"), lambda: self.parent.show_transaction(tx))
          if is_unconfirmed and tx:
              # note: the current implementation of RBF *needs* the old tx fee
              rbf = is_mine and not tx.is_final() and fee is not None
              if rbf:
                  menu.addAction(_("Increase fee"), lambda: self.parent.bump_fee_dialog(tx))
              else:
                  child_tx = self.wallet.cpfp(tx, 0)
                  if child_tx:
                      menu.addAction(_("Child pays for parent"), lambda: self.parent.cpfp(tx, child_tx))
          if pr_key:
              menu.addAction(self.icon_cache.get(":icons/seal"), _("View invoice"), lambda: self.parent.show_invoice(pr_key))
          if tx_URL:
              menu.addAction(_("View on block explorer"), lambda: webbrowser.open(tx_URL))
          menu.exec_(self.viewport().mapToGlobal(position))
  
      def remove_local_tx(self, delete_tx):
          to_delete = {delete_tx}
          to_delete |= self.wallet.get_depending_transactions(delete_tx)
          question = _("Are you sure you want to remove this transaction?")
          if len(to_delete) > 1:
              question = _(
                  "Are you sure you want to remove this transaction and {} child transactions?".format(len(to_delete) - 1)
              )
          answer = QMessageBox.question(self.parent, _("Please confirm"), question, QMessageBox.Yes, QMessageBox.No)
          if answer == QMessageBox.No:
              return
          for tx in to_delete:
              self.wallet.remove_transaction(tx)
          self.wallet.save_transactions(write=True)
          # need to update at least: history_list, utxo_list, address_list
          self.parent.need_update.set()
  
      def onFileAdded(self, fn):
          try:
              with open(fn) as f:
                  tx = self.parent.tx_from_text(f.read())
                  self.parent.save_transaction_into_wallet(tx)
          except IOError as e:
              self.parent.show_error(e)
  
      def export_history_dialog(self):
          d = WindowModalDialog(self, _('Export History'))
          d.setMinimumSize(400, 200)
          vbox = QVBoxLayout(d)
          defaultname = os.path.expanduser('~/garlium-history.csv')
          select_msg = _('Select file to export your wallet transactions to')
          hbox, filename_e, csv_button = filename_field(self, self.config, defaultname, select_msg)
          vbox.addLayout(hbox)
          vbox.addStretch(1)
          hbox = Buttons(CancelButton(d), OkButton(d, _('Export')))
          vbox.addLayout(hbox)
          #run_hook('export_history_dialog', self, hbox)
          self.update()
          if not d.exec_():
              return
          filename = filename_e.text()
          if not filename:
              return
          try:
              self.do_export_history(self.wallet, filename, csv_button.isChecked())
          except (IOError, os.error) as reason:
              export_error_label = _("Electrum was unable to produce a transaction export.")
              self.parent.show_critical(export_error_label + "\n" + str(reason), title=_("Unable to export history"))
              return
          self.parent.show_message(_("Your wallet history has been successfully exported."))
  
      def do_export_history(self, wallet, fileName, is_csv):
          history = self.transactions
          lines = []
          for item in history:
              if is_csv:
                  lines.append([item['txid'], item.get('label', ''), item['confirmations'], item['value'], item['date']])
              else:
                  lines.append(item)
          with open(fileName, "w+", encoding='utf-8') as f:
              if is_csv:
                  import csv
                  transaction = csv.writer(f, lineterminator='\n')
                  transaction.writerow(["transaction_hash","label", "confirmations", "value", "timestamp"])
                  for line in lines:
                      transaction.writerow(line)
              else:
                  from electrum_ltc.util import json_encode
                  f.write(json_encode(history))
  