def add_send_edit(self):
     self.send_fiat_e = AmountEdit(self.fiat_unit)
     btc_e = self.win.amount_e
     fee_e = self.win.fee_e
     self.connect_fields(btc_e, self.send_fiat_e, fee_e)
     self.win.send_grid.addWidget(self.send_fiat_e, 4, 3, Qt.AlignHCenter)
     btc_e.frozen.connect(
         lambda: self.send_fiat_e.setFrozen(btc_e.isReadOnly()))
 def add_send_edit(self):
     self.send_fiat_e = AmountEdit(self.fiat_unit)
     btc_e = self.win.amount_e
     fee_e = self.win.fee_e
     self.connect_fields(btc_e, self.send_fiat_e, fee_e)
     self.win.send_grid.addWidget(self.send_fiat_e, 4, 3, Qt.AlignHCenter)
     btc_e.frozen.connect(lambda: self.send_fiat_e.setFrozen(btc_e.isReadOnly()))
 def add_receive_edit(self):
     self.receive_fiat_e = AmountEdit(self.fiat_unit)
     btc_e = self.win.receive_amount_e
     self.connect_fields(btc_e, self.receive_fiat_e, None)
     self.win.receive_grid.addWidget(self.receive_fiat_e, 2, 3,
                                     Qt.AlignHCenter)
class Plugin(BasePlugin):
    def __init__(self, a, b):
        BasePlugin.__init__(self, a, b)
        self.currencies = [self.fiat_unit()]
        self.exchanges = [self.config.get('use_exchange', "BTC-e")]
        # Do price discovery
        self.exchanger = Exchanger(self)
        self.exchanger.start()
        self.win = None

    @hook
    def init_qt(self, gui):
        self.gui = gui
        self.win = self.gui.main_window
        self.win.connect(self.win, SIGNAL("refresh_currencies()"),
                         self.win.update_status)
        self.btc_rate = Decimal("0.0")
        self.resp_hist = {}
        self.tx_list = {}
        self.gui.exchanger = self.exchanger  #
        self.add_send_edit()
        self.add_receive_edit()
        self.win.update_status()

    def close(self):
        BasePlugin.close(self)
        self.exchanger.stop()
        self.exchanger = None
        self.gui.exchanger = None
        self.send_fiat_e.hide()
        self.receive_fiat_e.hide()
        self.win.update_status()

    def set_currencies(self, currency_options):
        self.currencies = sorted(currency_options)
        if self.win:
            self.win.emit(SIGNAL("refresh_currencies()"))
            self.win.emit(SIGNAL("refresh_currencies_combo()"))

    @hook
    def get_fiat_balance_text(self, btc_balance, r):
        # return balance as: 1.23 USD
        r[0] = self.create_fiat_balance_text(Decimal(btc_balance) / COIN)

    def get_fiat_price_text(self, r):
        # return BTC price as: 123.45 USD
        r[0] = self.create_fiat_balance_text(1)
        quote = r[0]
        if quote:
            r[0] = "%s" % quote

    @hook
    def get_fiat_status_text(self, btc_balance, r2):
        # return status as:   (1.23 USD)    1 BTC~123.45 USD
        text = ""
        r = {}
        self.get_fiat_price_text(r)
        quote = r.get(0)
        if quote:
            price_text = "1 BTA~%s" % quote
            fiat_currency = quote[-3:]
            btc_price = self.btc_rate
            fiat_balance = Decimal(btc_price) * Decimal(btc_balance) / COIN
            balance_text = "(%.2f %s)" % (fiat_balance, fiat_currency)
            text = "  " + balance_text + "     " + price_text + " "
        r2[0] = text

    def create_fiat_balance_text(self, btc_balance):
        quote_currency = self.fiat_unit()
        self.exchanger.use_exchange = self.config.get("use_exchange", "BTC-e")
        cur_rate = self.exchanger.exchange(Decimal("1.0"), quote_currency)
        if cur_rate is None:
            quote_text = ""
        else:
            quote_balance = btc_balance * Decimal(cur_rate)
            self.btc_rate = cur_rate
            quote_text = "%.2f %s" % (quote_balance, quote_currency)
        return quote_text

    @hook
    def load_wallet(self, wallet, window):
        tx_list = {}
        for item in self.wallet.get_history(
                self.wallet.storage.get("current_account", None)):
            tx_hash, conf, value, timestamp, balance = item
            tx_list[tx_hash] = {'value': value, 'timestamp': timestamp}

        self.tx_list = tx_list
        self.cur_exchange = self.config.get('use_exchange', "BTC-e")
        t = threading.Thread(target=self.request_history_rates, args=())
        t.setDaemon(True)
        t.start()

    def requires_settings(self):
        return True

    def request_history_rates(self):
        if self.config.get('history_rates') != "checked":
            return
        if not self.tx_list:
            return

        try:
            mintimestr = datetime.datetime.fromtimestamp(
                int(
                    min(self.tx_list.items(), key=lambda x: x[1]['timestamp'])
                    [1]['timestamp'])).strftime('%Y-%m-%d')
        except Exception:
            return
        maxtimestr = datetime.datetime.now().strftime('%Y-%m-%d')

        if self.cur_exchange == "CoinDesk":
            try:
                self.resp_hist = self.exchanger.get_json(
                    'api.coindesk.com',
                    "/v1/bpi/historical/close.json?start=" + mintimestr +
                    "&end=" + maxtimestr)
            except Exception:
                return
        elif self.cur_exchange == "Winkdex":
            try:
                self.resp_hist = self.exchanger.get_json(
                    'winkdex.com', "/api/v0/series?start_time=1342915200"
                )['series'][0]['results']
            except Exception:
                return
        elif self.cur_exchange == "BitcoinVenezuela":
            cur_currency = self.fiat_unit()
            if cur_currency in ("ARS", "EUR", "USD", "VEF"):
                try:
                    self.resp_hist = self.exchanger.get_json(
                        'api.bitcoinvenezuela.com',
                        "/historical/index.php?coin=BTA")[cur_currency +
                                                          '_BTA']
                except Exception:
                    return
            else:
                return
        elif self.cur_exchange == "Kraken":
            cur_currency = self.fiat_unit()
            if cur_currency in ("EUR", "USD"):
                try:
                    self.resp_hist = self.exchanger.get_json(
                        'api.kraken.com',
                        "https://api.kraken.com/0/public/OHLC?pair=BTA" +
                        cur_currency +
                        "&interval=1440")['result']['XBTAZ' + cur_currency]
                    self.resp_hist = dict([(t[0], t[4])
                                           for t in self.resp_hist])
                except Exception:
                    return
            else:
                return

        self.win.need_update.set()

    @hook
    def history_tab_update(self):
        if self.config.get('history_rates') != "checked":
            return
        if not self.resp_hist:
            return
        if not self.wallet:
            return

        self.win.is_edit = True
        self.win.history_list.setColumnCount(6)
        self.win.history_list.setHeaderLabels([
            '',
            _('Date'),
            _('Description'),
            _('Amount'),
            _('Balance'),
            _('Fiat Amount')
        ])
        root = self.win.history_list.invisibleRootItem()
        childcount = root.childCount()
        for i in range(childcount):
            item = root.child(i)
            try:
                tx_info = self.tx_list[str(
                    item.data(0, Qt.UserRole).toPyObject())]
            except Exception:
                newtx = self.wallet.get_history()
                v = newtx[[x[0] for x in newtx].index(
                    str(item.data(0, Qt.UserRole).toPyObject()))][2]
                tx_info = {'timestamp': int(time.time()), 'value': v}
                pass
            tx_time = int(tx_info['timestamp'])
            tx_value = Decimal(str(tx_info['value'])) / COIN
            if self.cur_exchange == "CoinDesk":
                tx_time_str = datetime.datetime.fromtimestamp(
                    tx_time).strftime('%Y-%m-%d')
                try:
                    tx_fiat_val = "%.2f %s" % (tx_value * Decimal(
                        self.resp_hist['bpi'][tx_time_str]), "USD")
                except KeyError:
                    tx_fiat_val = "%.2f %s" % (self.btc_rate * Decimal(
                        str(tx_info['value'])) / COIN, "USD")
            elif self.cur_exchange == "Winkdex":
                tx_time_str = datetime.datetime.fromtimestamp(
                    tx_time).strftime('%Y-%m-%d') + "T16:00:00-04:00"
                try:
                    tx_rate = self.resp_hist[[
                        x['timestamp'] for x in self.resp_hist
                    ].index(tx_time_str)]['price']
                    tx_fiat_val = "%.2f %s" % (tx_value * Decimal(tx_rate) /
                                               Decimal("100.0"), "USD")
                except ValueError:
                    tx_fiat_val = "%.2f %s" % (self.btc_rate * Decimal(
                        tx_info['value']) / COIN, "USD")
                except KeyError:
                    tx_fiat_val = _("No data")
            elif self.cur_exchange == "BitcoinVenezuela":
                tx_time_str = datetime.datetime.fromtimestamp(
                    tx_time).strftime('%Y-%m-%d')
                try:
                    num = self.resp_hist[tx_time_str].replace(',', '')
                    tx_fiat_val = "%.2f %s" % (tx_value * Decimal(num),
                                               self.fiat_unit())
                except KeyError:
                    tx_fiat_val = _("No data")
            elif self.cur_exchange == "Kraken":
                tx_day_time = int(tx_time / 86400) * 86400
                try:
                    num = self.resp_hist[tx_day_time]
                    tx_fiat_val = "%.2f %s" % (Decimal(str(tx_info['value'])) /
                                               COIN * Decimal(num),
                                               self.fiat_unit())
                except KeyError:
                    tx_fiat_val = _("No data")
            tx_fiat_val = " " * (12 - len(tx_fiat_val)) + tx_fiat_val
            item.setText(5, tx_fiat_val)
            item.setFont(5, QFont(MONOSPACE_FONT))
            if Decimal(str(tx_info['value'])) < 0:
                item.setForeground(5, QBrush(QColor("#BC1E1E")))

        self.win.history_list.setColumnWidth(5, 120)
        self.win.is_edit = False

    def settings_widget(self, window):
        return EnterButton(_('Settings'), self.settings_dialog)

    def settings_dialog(self):
        d = QDialog()
        d.setWindowTitle("Settings")
        layout = QGridLayout(d)
        layout.addWidget(QLabel(_('Exchange rate API: ')), 0, 0)
        layout.addWidget(QLabel(_('Currency: ')), 1, 0)
        layout.addWidget(QLabel(_('History Rates: ')), 2, 0)
        combo = QComboBox()
        combo_ex = QComboBox()
        hist_checkbox = QCheckBox()
        hist_checkbox.setEnabled(False)
        hist_checkbox.setChecked(
            self.config.get('history_rates', 'unchecked') != 'unchecked')
        ok_button = QPushButton(_("OK"))

        def on_change(x):
            try:
                cur_request = str(self.currencies[x])
            except Exception:
                return
            if cur_request != self.fiat_unit():
                self.config.set_key('currency', cur_request, True)
                cur_exchange = self.config.get('use_exchange', "BTC-e")
                if (cur_exchange, cur_request) in EXCH_SUPPORT_HIST:
                    hist_checkbox.setEnabled(True)
                else:
                    disable_check()
                self.win.update_status()
                try:
                    self.fiat_button
                except:
                    pass
                else:
                    self.fiat_button.setText(cur_request)

        def disable_check():
            hist_checkbox.setChecked(False)
            hist_checkbox.setEnabled(False)

        def on_change_ex(x):
            cur_request = str(self.exchanges[x])
            if cur_request != self.config.get('use_exchange', "BTC-e"):
                self.config.set_key('use_exchange', cur_request, True)
                self.currencies = []
                combo.clear()
                self.exchanger.query_rates.set()
                cur_currency = self.fiat_unit()
                if (cur_request, cur_currency) in EXCH_SUPPORT_HIST:
                    hist_checkbox.setEnabled(True)
                else:
                    disable_check()
                set_currencies(combo)
                self.win.update_status()

        def on_change_hist(checked):
            if checked:
                self.config.set_key('history_rates', 'checked')
                self.request_history_rates()
            else:
                self.config.set_key('history_rates', 'unchecked')
                self.win.history_list.setHeaderLabels([
                    '',
                    _('Date'),
                    _('Description'),
                    _('Amount'),
                    _('Balance')
                ])
                self.win.history_list.setColumnCount(5)

        def set_hist_check(hist_checkbox):
            cur_exchange = self.config.get('use_exchange', "BTC-e")
            hist_checkbox.setEnabled(
                cur_exchange in ["BitcoinVenezuela", "Kraken"])

        def set_currencies(combo):
            try:
                combo.blockSignals(True)
                current_currency = self.fiat_unit()
                combo.clear()
            except Exception:
                return
            combo.addItems(self.currencies)
            try:
                index = self.currencies.index(current_currency)
            except Exception:
                index = 0
                if len(self.currencies):
                    on_change(0)
            combo.blockSignals(False)
            combo.setCurrentIndex(index)

        def set_exchanges(combo_ex):
            try:
                combo_ex.clear()
            except Exception:
                return
            combo_ex.addItems(self.exchanges)
            try:
                index = self.exchanges.index(
                    self.config.get('use_exchange', "BTC-e"))
            except Exception:
                index = 0
            combo_ex.setCurrentIndex(index)

        def ok_clicked():
            if self.config.get('use_exchange',
                               "BTC-e") in ["CoinDesk", "itBit"]:
                self.exchanger.query_rates.set()
            d.accept()

        set_exchanges(combo_ex)
        set_currencies(combo)
        set_hist_check(hist_checkbox)
        combo.currentIndexChanged.connect(on_change)
        combo_ex.currentIndexChanged.connect(on_change_ex)
        hist_checkbox.stateChanged.connect(on_change_hist)
        combo.connect(self.win, SIGNAL('refresh_currencies_combo()'),
                      lambda: set_currencies(combo))
        combo_ex.connect(d, SIGNAL('refresh_exchanges_combo()'),
                         lambda: set_exchanges(combo_ex))
        ok_button.clicked.connect(lambda: ok_clicked())
        layout.addWidget(combo, 1, 1)
        layout.addWidget(combo_ex, 0, 1)
        layout.addWidget(hist_checkbox, 2, 1)
        layout.addWidget(ok_button, 3, 1)

        if d.exec_():
            return True
        else:
            return False

    def fiat_unit(self):
        return self.config.get("currency", "EUR")

    def add_send_edit(self):
        self.send_fiat_e = AmountEdit(self.fiat_unit)
        btc_e = self.win.amount_e
        fee_e = self.win.fee_e
        self.connect_fields(btc_e, self.send_fiat_e, fee_e)
        self.win.send_grid.addWidget(self.send_fiat_e, 4, 3, Qt.AlignHCenter)
        btc_e.frozen.connect(
            lambda: self.send_fiat_e.setFrozen(btc_e.isReadOnly()))

    def add_receive_edit(self):
        self.receive_fiat_e = AmountEdit(self.fiat_unit)
        btc_e = self.win.receive_amount_e
        self.connect_fields(btc_e, self.receive_fiat_e, None)
        self.win.receive_grid.addWidget(self.receive_fiat_e, 2, 3,
                                        Qt.AlignHCenter)

    def connect_fields(self, btc_e, fiat_e, fee_e):
        def fiat_changed():
            try:
                fiat_amount = Decimal(str(fiat_e.text()))
            except:
                btc_e.setText("")
                if fee_e: fee_e.setText("")
                return
            exchange_rate = self.exchanger.exchange(Decimal("1.0"),
                                                    self.fiat_unit())
            if exchange_rate is not None:
                btc_amount = fiat_amount / exchange_rate
                btc_e.setAmount(int(btc_amount * Decimal(COIN)))
                if fee_e: self.win.update_fee()

        fiat_e.textEdited.connect(fiat_changed)

        def btc_changed():
            if self.exchanger is None:
                return
            btc_amount = btc_e.get_amount()
            if btc_amount is None:
                fiat_e.setText("")
                return
            fiat_amount = self.exchanger.exchange(
                Decimal(btc_amount) / Decimal(COIN), self.fiat_unit())
            if fiat_amount is not None:
                pos = fiat_e.cursorPosition()
                fiat_e.setText("%.2f" % fiat_amount)
                fiat_e.setCursorPosition(pos)

        btc_e.textEdited.connect(btc_changed)
class Plugin(BasePlugin):

    def __init__(self,a,b):
        BasePlugin.__init__(self,a,b)
        self.currencies = [self.fiat_unit()]
        self.exchanges = [self.config.get('use_exchange', "BTC-e")]
        # Do price discovery
        self.exchanger = Exchanger(self)
        self.exchanger.start()
        self.win = None

    @hook
    def init_qt(self, gui):
        self.gui = gui
        self.win = self.gui.main_window
        self.win.connect(self.win, SIGNAL("refresh_currencies()"), self.win.update_status)
        self.btc_rate = Decimal("0.0")
        self.resp_hist = {}
        self.tx_list = {}
        self.gui.exchanger = self.exchanger #
        self.add_send_edit()
        self.add_receive_edit()
        self.win.update_status()

    def close(self):
        BasePlugin.close(self)
        self.exchanger.stop()
        self.exchanger = None
        self.gui.exchanger = None
        self.send_fiat_e.hide()
        self.receive_fiat_e.hide()
        self.win.update_status()

    def set_currencies(self, currency_options):
        self.currencies = sorted(currency_options)
        if self.win:
            self.win.emit(SIGNAL("refresh_currencies()"))
            self.win.emit(SIGNAL("refresh_currencies_combo()"))

    @hook
    def get_fiat_balance_text(self, btc_balance, r):
        # return balance as: 1.23 USD
        r[0] = self.create_fiat_balance_text(Decimal(btc_balance) / COIN)

    def get_fiat_price_text(self, r):
        # return BTC price as: 123.45 USD
        r[0] = self.create_fiat_balance_text(1)
        quote = r[0]
        if quote:
            r[0] = "%s"%quote

    @hook
    def get_fiat_status_text(self, btc_balance, r2):
        # return status as:   (1.23 USD)    1 BTC~123.45 USD
        text = ""
        r = {}
        self.get_fiat_price_text(r)
        quote = r.get(0)
        if quote:
            price_text = "1 BTA~%s"%quote
            fiat_currency = quote[-3:]
            btc_price = self.btc_rate
            fiat_balance = Decimal(btc_price) * Decimal(btc_balance) / COIN
            balance_text = "(%.2f %s)" % (fiat_balance,fiat_currency)
            text = "  " + balance_text + "     " + price_text + " "
        r2[0] = text

    def create_fiat_balance_text(self, btc_balance):
        quote_currency = self.fiat_unit()
        self.exchanger.use_exchange = self.config.get("use_exchange", "BTC-e")
        cur_rate = self.exchanger.exchange(Decimal("1.0"), quote_currency)
        if cur_rate is None:
            quote_text = ""
        else:
            quote_balance = btc_balance * Decimal(cur_rate)
            self.btc_rate = cur_rate
            quote_text = "%.2f %s" % (quote_balance, quote_currency)
        return quote_text

    @hook
    def load_wallet(self, wallet, window):
        tx_list = {}
        for item in self.wallet.get_history(self.wallet.storage.get("current_account", None)):
            tx_hash, conf, value, timestamp, balance = item
            tx_list[tx_hash] = {'value': value, 'timestamp': timestamp }

        self.tx_list = tx_list
        self.cur_exchange = self.config.get('use_exchange', "BTC-e")
        t = threading.Thread(target=self.request_history_rates, args=())
        t.setDaemon(True)
        t.start()


    def requires_settings(self):
        return True


    def request_history_rates(self):
        if self.config.get('history_rates') != "checked":
            return
        if not self.tx_list:
            return

        try:
            mintimestr = datetime.datetime.fromtimestamp(int(min(self.tx_list.items(), key=lambda x: x[1]['timestamp'])[1]['timestamp'])).strftime('%Y-%m-%d')
        except Exception:
            return
        maxtimestr = datetime.datetime.now().strftime('%Y-%m-%d')

        if self.cur_exchange == "CoinDesk":
            try:
                self.resp_hist = self.exchanger.get_json('api.coindesk.com', "/v1/bpi/historical/close.json?start=" + mintimestr + "&end=" + maxtimestr)
            except Exception:
                return
        elif self.cur_exchange == "Winkdex":
            try:
                self.resp_hist = self.exchanger.get_json('winkdex.com', "/api/v0/series?start_time=1342915200")['series'][0]['results']
            except Exception:
                return
        elif self.cur_exchange == "BitcoinVenezuela":
            cur_currency = self.fiat_unit()
            if cur_currency in ("ARS", "EUR", "USD", "VEF"):
                try:
                    self.resp_hist = self.exchanger.get_json('api.bitcoinvenezuela.com', "/historical/index.php?coin=BTA")[cur_currency + '_BTA']
                except Exception:
                    return
            else:
                return
        elif self.cur_exchange == "Kraken":
            cur_currency = self.fiat_unit()
            if cur_currency in ("EUR", "USD"):
                try:
                    self.resp_hist = self.exchanger.get_json('api.kraken.com', "https://api.kraken.com/0/public/OHLC?pair=BTA"+cur_currency+"&interval=1440")['result']['XBTAZ'+cur_currency]
                    self.resp_hist = dict([(t[0], t[4]) for t in self.resp_hist])
                except Exception:
                    return
            else:
                return

        self.win.need_update.set()

    @hook
    def history_tab_update(self):
        if self.config.get('history_rates') != "checked":
            return
        if not self.resp_hist:
            return
        if not self.wallet:
            return

        self.win.is_edit = True
        self.win.history_list.setColumnCount(6)
        self.win.history_list.setHeaderLabels( [ '', _('Date'), _('Description') , _('Amount'), _('Balance'), _('Fiat Amount')] )
        root = self.win.history_list.invisibleRootItem()
        childcount = root.childCount()
        for i in range(childcount):
            item = root.child(i)
            try:
                tx_info = self.tx_list[str(item.data(0, Qt.UserRole).toPyObject())]
            except Exception:
                newtx = self.wallet.get_history()
                v = newtx[[x[0] for x in newtx].index(str(item.data(0, Qt.UserRole).toPyObject()))][2]
                tx_info = {'timestamp':int(time.time()), 'value': v}
                pass
            tx_time = int(tx_info['timestamp'])
            tx_value = Decimal(str(tx_info['value'])) / COIN
            if self.cur_exchange == "CoinDesk":
                tx_time_str = datetime.datetime.fromtimestamp(tx_time).strftime('%Y-%m-%d')
                try:
                    tx_fiat_val = "%.2f %s" % (tx_value * Decimal(self.resp_hist['bpi'][tx_time_str]), "USD")
                except KeyError:
                    tx_fiat_val = "%.2f %s" % (self.btc_rate * Decimal(str(tx_info['value']))/COIN , "USD")
            elif self.cur_exchange == "Winkdex":
                tx_time_str = datetime.datetime.fromtimestamp(tx_time).strftime('%Y-%m-%d') + "T16:00:00-04:00"
                try:
                    tx_rate = self.resp_hist[[x['timestamp'] for x in self.resp_hist].index(tx_time_str)]['price']
                    tx_fiat_val = "%.2f %s" % (tx_value * Decimal(tx_rate)/Decimal("100.0"), "USD")
                except ValueError:
                    tx_fiat_val = "%.2f %s" % (self.btc_rate * Decimal(tx_info['value'])/COIN , "USD")
                except KeyError:
                    tx_fiat_val = _("No data")
            elif self.cur_exchange == "BitcoinVenezuela":
                tx_time_str = datetime.datetime.fromtimestamp(tx_time).strftime('%Y-%m-%d')
                try:
                    num = self.resp_hist[tx_time_str].replace(',','')
                    tx_fiat_val = "%.2f %s" % (tx_value * Decimal(num), self.fiat_unit())
                except KeyError:
                    tx_fiat_val = _("No data")
            elif self.cur_exchange == "Kraken":
                tx_day_time = int(tx_time / 86400) * 86400
                try:
                    num = self.resp_hist[tx_day_time]
                    tx_fiat_val = "%.2f %s" % (Decimal(str(tx_info['value'])) / COIN * Decimal(num), self.fiat_unit())
                except KeyError:
                    tx_fiat_val = _("No data")
            tx_fiat_val = " "*(12-len(tx_fiat_val)) + tx_fiat_val
            item.setText(5, tx_fiat_val)
            item.setFont(5, QFont(MONOSPACE_FONT))
            if Decimal(str(tx_info['value'])) < 0:
                item.setForeground(5, QBrush(QColor("#BC1E1E")))

        self.win.history_list.setColumnWidth(5, 120)
        self.win.is_edit = False


    def settings_widget(self, window):
        return EnterButton(_('Settings'), self.settings_dialog)

    def settings_dialog(self):
        d = QDialog()
        d.setWindowTitle("Settings")
        layout = QGridLayout(d)
        layout.addWidget(QLabel(_('Exchange rate API: ')), 0, 0)
        layout.addWidget(QLabel(_('Currency: ')), 1, 0)
        layout.addWidget(QLabel(_('History Rates: ')), 2, 0)
        combo = QComboBox()
        combo_ex = QComboBox()
        hist_checkbox = QCheckBox()
        hist_checkbox.setEnabled(False)
        hist_checkbox.setChecked(self.config.get('history_rates', 'unchecked') != 'unchecked')
        ok_button = QPushButton(_("OK"))

        def on_change(x):
            try:
                cur_request = str(self.currencies[x])
            except Exception:
                return
            if cur_request != self.fiat_unit():
                self.config.set_key('currency', cur_request, True)
                cur_exchange = self.config.get('use_exchange', "BTC-e")
                if (cur_exchange, cur_request) in EXCH_SUPPORT_HIST:
                    hist_checkbox.setEnabled(True)
                else:
                    disable_check()
                self.win.update_status()
                try:
                    self.fiat_button
                except:
                    pass
                else:
                    self.fiat_button.setText(cur_request)

        def disable_check():
            hist_checkbox.setChecked(False)
            hist_checkbox.setEnabled(False)

        def on_change_ex(x):
            cur_request = str(self.exchanges[x])
            if cur_request != self.config.get('use_exchange', "BTC-e"):
                self.config.set_key('use_exchange', cur_request, True)
                self.currencies = []
                combo.clear()
                self.exchanger.query_rates.set()
                cur_currency = self.fiat_unit()
                if (cur_request, cur_currency) in EXCH_SUPPORT_HIST:
                    hist_checkbox.setEnabled(True)
                else:
                    disable_check()
                set_currencies(combo)
                self.win.update_status()

        def on_change_hist(checked):
            if checked:
                self.config.set_key('history_rates', 'checked')
                self.request_history_rates()
            else:
                self.config.set_key('history_rates', 'unchecked')
                self.win.history_list.setHeaderLabels( [ '', _('Date'), _('Description') , _('Amount'), _('Balance')] )
                self.win.history_list.setColumnCount(5)

        def set_hist_check(hist_checkbox):
            cur_exchange = self.config.get('use_exchange', "BTC-e")
            hist_checkbox.setEnabled(cur_exchange in ["BitcoinVenezuela", "Kraken"])

        def set_currencies(combo):
            try:
                combo.blockSignals(True)
                current_currency = self.fiat_unit()
                combo.clear()
            except Exception:
                return
            combo.addItems(self.currencies)
            try:
                index = self.currencies.index(current_currency)
            except Exception:
                index = 0
                if len(self.currencies):
                    on_change(0)
            combo.blockSignals(False)
            combo.setCurrentIndex(index)

        def set_exchanges(combo_ex):
            try:
                combo_ex.clear()
            except Exception:
                return
            combo_ex.addItems(self.exchanges)
            try:
                index = self.exchanges.index(self.config.get('use_exchange', "BTC-e"))
            except Exception:
                index = 0
            combo_ex.setCurrentIndex(index)

        def ok_clicked():
            if self.config.get('use_exchange', "BTC-e") in ["CoinDesk", "itBit"]:
                self.exchanger.query_rates.set()
            d.accept();

        set_exchanges(combo_ex)
        set_currencies(combo)
        set_hist_check(hist_checkbox)
        combo.currentIndexChanged.connect(on_change)
        combo_ex.currentIndexChanged.connect(on_change_ex)
        hist_checkbox.stateChanged.connect(on_change_hist)
        combo.connect(self.win, SIGNAL('refresh_currencies_combo()'), lambda: set_currencies(combo))
        combo_ex.connect(d, SIGNAL('refresh_exchanges_combo()'), lambda: set_exchanges(combo_ex))
        ok_button.clicked.connect(lambda: ok_clicked())
        layout.addWidget(combo,1,1)
        layout.addWidget(combo_ex,0,1)
        layout.addWidget(hist_checkbox,2,1)
        layout.addWidget(ok_button,3,1)

        if d.exec_():
            return True
        else:
            return False

    def fiat_unit(self):
        return self.config.get("currency", "EUR")

    def add_send_edit(self):
        self.send_fiat_e = AmountEdit(self.fiat_unit)
        btc_e = self.win.amount_e
        fee_e = self.win.fee_e
        self.connect_fields(btc_e, self.send_fiat_e, fee_e)
        self.win.send_grid.addWidget(self.send_fiat_e, 4, 3, Qt.AlignHCenter)
        btc_e.frozen.connect(lambda: self.send_fiat_e.setFrozen(btc_e.isReadOnly()))

    def add_receive_edit(self):
        self.receive_fiat_e = AmountEdit(self.fiat_unit)
        btc_e = self.win.receive_amount_e
        self.connect_fields(btc_e, self.receive_fiat_e, None)
        self.win.receive_grid.addWidget(self.receive_fiat_e, 2, 3, Qt.AlignHCenter)

    def connect_fields(self, btc_e, fiat_e, fee_e):
        def fiat_changed():
            try:
                fiat_amount = Decimal(str(fiat_e.text()))
            except:
                btc_e.setText("")
                if fee_e: fee_e.setText("")
                return
            exchange_rate = self.exchanger.exchange(Decimal("1.0"), self.fiat_unit())
            if exchange_rate is not None:
                btc_amount = fiat_amount/exchange_rate
                btc_e.setAmount(int(btc_amount*Decimal(COIN)))
                if fee_e: self.win.update_fee()
        fiat_e.textEdited.connect(fiat_changed)
        def btc_changed():
            if self.exchanger is None:
                return
            btc_amount = btc_e.get_amount()
            if btc_amount is None:
                fiat_e.setText("")
                return
            fiat_amount = self.exchanger.exchange(Decimal(btc_amount)/Decimal(COIN), self.fiat_unit())
            if fiat_amount is not None:
                pos = fiat_e.cursorPosition()
                fiat_e.setText("%.2f"%fiat_amount)
                fiat_e.setCursorPosition(pos)
        btc_e.textEdited.connect(btc_changed)