#!/usr/bin/env python3

#    Copyright (C) 2013-2017 Christian Thomas Jacobs.

#    This file is part of PyQSO.

#    PyQSO is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    PyQSO is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with PyQSO.  If not, see <http://www.gnu.org/licenses/>.

from gi.repository import Gtk
import logging
try:
    import configparser
except ImportError:
    import ConfigParser as configparser
import os.path
import base64
try:
    import Hamlib
    have_hamlib = True
except ImportError:
    logging.warning("Could not import the Hamlib module!")
    have_hamlib = False
try:
    import geocoder
    have_geocoder = True
except ImportError:
    logging.warning("Could not import the geocoder module!")
    have_geocoder = False

from pyqso.adif import AVAILABLE_FIELD_NAMES_ORDERED, MODES
from pyqso.auxiliary_dialogs import error

PREFERENCES_FILE = os.path.expanduser("~/.config/pyqso/preferences.ini")


class PreferencesDialog:

    """ A dialog to specify the PyQSO preferences. """

    def __init__(self, application):
        """ Set up the various pages of the preferences dialog.

        :arg application: The PyQSO application containing the main Gtk window, etc.
        """

        logging.debug("Setting up the preferences dialog...")

        self.application = application
        self.builder = self.application.builder
        glade_file_path = os.path.join(os.path.realpath(os.path.dirname(__file__)), "res", "pyqso.glade")
        self.builder.add_objects_from_file(glade_file_path, ("preferences_dialog",))
        self.dialog = self.builder.get_object("preferences_dialog")

        self.general = GeneralPage(self.dialog, self.builder)
        self.view = ViewPage(self.dialog, self.builder)
        self.records = RecordsPage(self.dialog, self.builder)
        self.import_export = ImportExportPage(self.dialog, self.builder)
        self.hamlib = HamlibPage(self.dialog, self.builder)
        self.world_map = WorldMapPage(self.dialog, self.builder)

        self.dialog.show_all()

        logging.debug("Preferences dialog ready!")

        return

    def commit(self):
        """ Commit the user preferences to the configuration file. """

        logging.debug("Committing the user preferences to the configuration file...")

        config = configparser.ConfigParser()

        # General
        config.add_section("general")
        for key in list(self.general.data.keys()):
            config.set("general", key.lower(), str(self.general.data[key]))

        # View
        config.add_section("view")
        for key in list(self.view.data.keys()):
            config.set("view", key.lower(), str(self.view.data[key]))

        # Records
        config.add_section("records")
        for key in list(self.records.data.keys()):
            config.set("records", key.lower(), str(self.records.data[key]))

        # Import/Export
        config.add_section("import_export")
        for key in list(self.import_export.data.keys()):
            config.set("import_export", key.lower(), str(self.import_export.data[key]))

        # Hamlib
        config.add_section("hamlib")
        for key in list(self.hamlib.data.keys()):
            config.set("hamlib", key.lower(), str(self.hamlib.data[key]))

        # World Map
        config.add_section("world_map")
        for key in list(self.world_map.data.keys()):
            config.set("world_map", key.lower(), str(self.world_map.data[key]))

        # Write the preferences to file.
        with open(os.path.expanduser(PREFERENCES_FILE), 'w') as f:
            config.write(f)

        return


class GeneralPage:

    """ The section of the preferences dialog containing general preferences. """

    def __init__(self, parent, builder):
        """ Set up the General page of the Preferences dialog. """

        self.parent = parent
        self.builder = builder
        self.sources = {}

        # Remember that the have_config conditional in the PyQSO class may be out-of-date the next time the user opens up the preferences dialog
        # because a configuration file may have been created after launching the application. Let's check to see if one exists again...
        config = configparser.ConfigParser()
        have_config = (config.read(PREFERENCES_FILE) != [])

        # Show toolbox.
        self.sources["SHOW_TOOLBOX"] = self.builder.get_object("general_show_toolbox_checkbutton")
        (section, option) = ("general", "show_toolbox")
        if(have_config and config.has_option(section, option)):
            self.sources["SHOW_TOOLBOX"].set_active(config.getboolean(section, option))
        else:
            self.sources["SHOW_TOOLBOX"].set_active(False)

        # Show statistics.
        self.sources["SHOW_YEARLY_STATISTICS"] = self.builder.get_object("general_show_yearly_statistics_checkbutton")
        (section, option) = ("general", "show_yearly_statistics")
        if(have_config and config.has_option(section, option)):
            self.sources["SHOW_YEARLY_STATISTICS"].set_active(config.getboolean(section, option))
        else:
            self.sources["SHOW_YEARLY_STATISTICS"].set_active(False)

        # Default logbook.
        self.sources["DEFAULT_LOGBOOK"] = self.builder.get_object("general_default_logbook_checkbutton")
        (section, option) = ("general", "default_logbook")
        if(have_config and config.has_option(section, option)):
            self.sources["DEFAULT_LOGBOOK"].set_active(config.getboolean(section, option))
        else:
            self.sources["DEFAULT_LOGBOOK"].set_active(False)
        self.sources["DEFAULT_LOGBOOK"].connect("toggled", self.on_default_logbook_toggled)

        self.sources["DEFAULT_LOGBOOK_PATH"] = self.builder.get_object("general_default_logbook_entry")
        (section, option) = ("general", "default_logbook")
        # Disable the text entry box if the default logbook checkbox is not checked.
        if(have_config and config.has_option(section, option)):
            self.sources["DEFAULT_LOGBOOK_PATH"].set_sensitive(self.sources["DEFAULT_LOGBOOK"].get_active())
            self.builder.get_object("general_default_logbook_button").set_sensitive(self.sources["DEFAULT_LOGBOOK"].get_active())
        else:
            self.sources["DEFAULT_LOGBOOK_PATH"].set_sensitive(False)
            self.builder.get_object("general_default_logbook_button").set_sensitive(False)
        (section, option) = ("general", "default_logbook_path")
        if(have_config and config.has_option(section, option)):
            self.sources["DEFAULT_LOGBOOK_PATH"].set_text(config.get(section, option))

        self.builder.get_object("general_default_logbook_button").connect("clicked", self.on_default_logbook_clicked)

        # Keep 'Add Record' dialog open.
        self.sources["KEEP_OPEN"] = self.builder.get_object("general_keep_open_checkbutton")
        (section, option) = ("general", "keep_open")
        if(have_config and config.has_option(section, option)):
            self.sources["KEEP_OPEN"].set_active(config.getboolean(section, option))
        else:
            self.sources["KEEP_OPEN"].set_active(False)

        return

    @property
    def data(self):
        """ User preferences regarding General settings. """
        data = {}
        data["SHOW_TOOLBOX"] = self.sources["SHOW_TOOLBOX"].get_active()
        data["SHOW_YEARLY_STATISTICS"] = self.sources["SHOW_YEARLY_STATISTICS"].get_active()
        data["DEFAULT_LOGBOOK"] = self.sources["DEFAULT_LOGBOOK"].get_active()
        data["DEFAULT_LOGBOOK_PATH"] = os.path.expanduser(self.sources["DEFAULT_LOGBOOK_PATH"].get_text())
        data["KEEP_OPEN"] = self.sources["KEEP_OPEN"].get_active()
        return data

    def on_default_logbook_toggled(self, widget, data=None):
        if(widget.get_active()):
            self.sources["DEFAULT_LOGBOOK_PATH"].set_sensitive(True)
            self.builder.get_object("general_default_logbook_button").set_sensitive(True)
        else:
            self.sources["DEFAULT_LOGBOOK_PATH"].set_sensitive(False)
            self.builder.get_object("general_default_logbook_button").set_sensitive(False)
        return

    def on_default_logbook_clicked(self, widget):
        """ Let the user select the default logbook file via a file chooser dialog,
        and set the path in the adjacent entry box. """

        dialog = Gtk.FileChooserDialog("Select SQLite Database File",
                                       self.parent,
                                       Gtk.FileChooserAction.OPEN,
                                       (Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
                                        Gtk.STOCK_OPEN, Gtk.ResponseType.OK))
        response = dialog.run()
        if(response == Gtk.ResponseType.OK):
            path = dialog.get_filename()
            self.sources["DEFAULT_LOGBOOK_PATH"].set_text(path)
        dialog.destroy()
        return


class ViewPage:

    """ The section of the preferences dialog containing view-related preferences. """

    def __init__(self, parent, builder):
        """ Set up the View page of the Preferences dialog. """

        self.parent = parent
        self.builder = builder
        self.sources = {}

        config = configparser.ConfigParser()
        have_config = (config.read(PREFERENCES_FILE) != [])

        # Visible fields
        for field_name in AVAILABLE_FIELD_NAMES_ORDERED:
            self.sources[field_name] = self.builder.get_object("visible_fields_%s" % (field_name.lower()))
            if(have_config and config.has_option("view", field_name.lower())):
                self.sources[field_name].set_active(config.getboolean("view", field_name.lower()))
            else:
                self.sources[field_name].set_active(True)

        return

    @property
    def data(self):
        """ User preferences regarding View settings. """
        data = {}
        for field_name in AVAILABLE_FIELD_NAMES_ORDERED:
            data[field_name] = self.sources[field_name].get_active()
        return data


class RecordsPage:

    """ The section of the preferences dialog containing record-related preferences. """

    def __init__(self, parent, builder):
        """ Set up the Record page of the Preferences dialog. """

        self.parent = parent
        self.builder = builder
        self.sources = {}

        # Remember that the have_config conditional in the PyQSO class may be out-of-date the next time the user opens up the preferences dialog
        # because a configuration file may have been created after launching the application. Let's check to see if one exists again...
        config = configparser.ConfigParser()
        have_config = (config.read(PREFERENCES_FILE) != [])

        # Autocomplete
        self.sources["AUTOCOMPLETE_BAND"] = self.builder.get_object("records_autocomplete_band_checkbutton")
        (section, option) = ("records", "autocomplete_band")
        if(have_config and config.has_option(section, option)):
            self.sources["AUTOCOMPLETE_BAND"].set_active(config.getboolean(section, option))
        else:
            self.sources["AUTOCOMPLETE_BAND"].set_active(True)

        self.sources["USE_UTC"] = self.builder.get_object("records_autocomplete_utc_checkbutton")
        (section, option) = ("records", "use_utc")
        if(have_config and config.has_option(section, option)):
            self.sources["USE_UTC"].set_active(config.getboolean(section, option))
        else:
            self.sources["USE_UTC"].set_active(True)

        # Default values

        # Mode
        self.sources["DEFAULT_MODE"] = self.builder.get_object("default_values_mode_combo")
        for mode in sorted(MODES.keys()):
            self.sources["DEFAULT_MODE"].append_text(mode)
        (section, option) = ("records", "default_mode")
        if(have_config and config.has_option(section, option)):
            mode = config.get(section, option)
        else:
            mode = ""
        self.sources["DEFAULT_MODE"].set_active(sorted(MODES.keys()).index(mode))
        self.sources["DEFAULT_MODE"].connect("changed", self.on_mode_changed)

        # Submode
        self.sources["DEFAULT_SUBMODE"] = self.builder.get_object("default_values_submode_combo")
        for submode in MODES[mode]:
            self.sources["DEFAULT_SUBMODE"].append_text(submode)
        (section, option) = ("records", "default_submode")
        if(have_config and config.has_option(section, option)):
            submode = config.get(section, option)
        else:
            submode = ""
        self.sources["DEFAULT_SUBMODE"].set_active(MODES[mode].index(submode))

        # Power
        self.sources["DEFAULT_POWER"] = self.builder.get_object("default_values_tx_power_entry")
        (section, option) = ("records", "default_power")
        if(have_config and config.has_option(section, option)):
            self.sources["DEFAULT_POWER"].set_text(config.get(section, option))
        else:
            self.sources["DEFAULT_POWER"].set_text("")

        # Frequency unit
        self.sources["DEFAULT_FREQUENCY_UNIT"] = self.builder.get_object("default_values_frequency_unit_combo")
        units = ["Hz", "kHz", "MHz", "GHz"]
        for unit in units:
            self.sources["DEFAULT_FREQUENCY_UNIT"].append_text(unit)
        (section, option) = ("records", "default_frequency_unit")
        if(have_config and config.has_option(section, option)):
            self.sources["DEFAULT_FREQUENCY_UNIT"].set_active(units.index(config.get(section, option)))
        else:
            self.sources["DEFAULT_FREQUENCY_UNIT"].set_active(units.index("MHz"))

        # Callsign lookup
        self.sources["CALLSIGN_DATABASE"] = self.builder.get_object("callsign_lookup_database_combo")
        callsign_database = ["", "qrz.com", "hamqth.com"]
        for database in callsign_database:
            self.sources["CALLSIGN_DATABASE"].append_text(database)
        (section, option) = ("records", "callsign_database")
        if(have_config and config.has_option(section, option)):
            self.sources["CALLSIGN_DATABASE"].set_active(callsign_database.index(config.get(section, option)))
        else:
            self.sources["CALLSIGN_DATABASE"].set_active(callsign_database.index(""))

        # Login details
        self.sources["CALLSIGN_DATABASE_USERNAME"] = self.builder.get_object("callsign_lookup_login_details_username_entry")
        (section, option) = ("records", "callsign_database_username")
        if(have_config and config.has_option(section, option)):
            self.sources["CALLSIGN_DATABASE_USERNAME"].set_text(config.get(section, option))

        self.sources["CALLSIGN_DATABASE_PASSWORD"] = self.builder.get_object("callsign_lookup_login_details_password_entry")
        (section, option) = ("records", "callsign_database_password")
        if(have_config and config.has_option(section, option)):
            password = base64.b64decode(config.get(section, option)).decode("utf-8")
            self.sources["CALLSIGN_DATABASE_PASSWORD"].set_text(password)

        self.sources["IGNORE_PREFIX_SUFFIX"] = self.builder.get_object("callsign_lookup_ignore_prefix_suffix_checkbutton")
        (section, option) = ("records", "ignore_prefix_suffix")
        if(have_config and config.has_option(section, option)):
            self.sources["IGNORE_PREFIX_SUFFIX"].set_active(config.getboolean(section, option))
        else:
            self.sources["IGNORE_PREFIX_SUFFIX"].set_active(True)

        return

    @property
    def data(self):
        """ User preferences regarding Records settings. """
        data = {}
        data["AUTOCOMPLETE_BAND"] = self.sources["AUTOCOMPLETE_BAND"].get_active()
        data["USE_UTC"] = self.sources["USE_UTC"].get_active()

        data["DEFAULT_MODE"] = self.sources["DEFAULT_MODE"].get_active_text()
        data["DEFAULT_SUBMODE"] = self.sources["DEFAULT_SUBMODE"].get_active_text()
        data["DEFAULT_POWER"] = self.sources["DEFAULT_POWER"].get_text()
        data["DEFAULT_FREQUENCY_UNIT"] = self.sources["DEFAULT_FREQUENCY_UNIT"].get_active_text()

        data["CALLSIGN_DATABASE"] = self.sources["CALLSIGN_DATABASE"].get_active_text()
        data["CALLSIGN_DATABASE_USERNAME"] = self.sources["CALLSIGN_DATABASE_USERNAME"].get_text()
        data["CALLSIGN_DATABASE_PASSWORD"] = base64.b64encode(self.sources["CALLSIGN_DATABASE_PASSWORD"].get_text().encode("utf-8")).decode("utf-8")  # Need to convert from bytes to str here.
        data["IGNORE_PREFIX_SUFFIX"] = self.sources["IGNORE_PREFIX_SUFFIX"].get_active()
        return data

    def on_mode_changed(self, combo):
        """ If the MODE field has changed its value, then fill the SUBMODE field with all the available SUBMODE options for that new MODE. """
        self.sources["DEFAULT_SUBMODE"].get_model().clear()
        mode = combo.get_active_text()
        for submode in MODES[mode]:
            self.sources["DEFAULT_SUBMODE"].append_text(submode)
        self.sources["DEFAULT_SUBMODE"].set_active(MODES[mode].index(""))
        return


class ImportExportPage:

    """ The section of the preferences dialog containing import/export-related preferences. """

    def __init__(self, parent, builder):
        """ Set up the Import/Export page of the Preferences dialog. """

        self.parent = parent
        self.builder = builder
        self.sources = {}

        # Remember that the have_config conditional in the PyQSO class may be out-of-date the next time the user opens up the preferences dialog
        # because a configuration file may have been created after launching the application. Let's check to see if one exists again...
        config = configparser.ConfigParser()
        have_config = (config.read(PREFERENCES_FILE) != [])

        # Import
        self.sources["MERGE_COMMENT"] = self.builder.get_object("adif_import_merge_comment_checkbutton")
        (section, option) = ("import_export", "merge_comment")
        if(have_config and config.has_option(section, option)):
            self.sources["MERGE_COMMENT"].set_active(config.getboolean(section, option))
        else:
            self.sources["MERGE_COMMENT"].set_active(False)

        return

    @property
    def data(self):
        """ User preferences regarding Import/Export settings. """
        data = {}
        data["MERGE_COMMENT"] = self.sources["MERGE_COMMENT"].get_active()
        return data


class HamlibPage:

    """ The section of the preferences dialog containing Hamlib-related preferences. """

    def __init__(self, parent, builder):
        """ Set up the Hamlib page of the Preferences dialog. """

        self.parent = parent
        self.builder = builder
        self.sources = {}

        config = configparser.ConfigParser()
        have_config = (config.read(PREFERENCES_FILE) != [])

        self.sources["AUTOFILL"] = self.builder.get_object("hamlib_support_checkbutton")
        (section, option) = ("hamlib", "autofill")
        if(have_config and config.has_option(section, option)):
            self.sources["AUTOFILL"].set_active(config.getboolean(section, option))
        else:
            self.sources["AUTOFILL"].set_active(False)

        # Get the list of rig models
        models = ["RIG_MODEL_NONE"]
        if(have_hamlib):
            try:
                for item in dir(Hamlib):
                    if(item.startswith("RIG_MODEL_")):
                        models.append(item)
            except:
                logging.error("Could not obtain rig models list via Hamlib!")
        else:
            logging.debug("Hamlib module not present. Could not obtain a list of rig models.")

        self.sources["RIG_MODEL"] = self.builder.get_object("hamlib_support_model_combo")
        for model in models:
            self.sources["RIG_MODEL"].append_text(model)
        (section, option) = ("hamlib", "rig_model")
        if(have_config and config.has_option("hamlib", "rig_model")):
            self.sources["RIG_MODEL"].set_active(models.index(config.get("hamlib", "rig_model")))
        else:
            self.sources["RIG_MODEL"].set_active(models.index("RIG_MODEL_NONE"))  # Set to RIG_MODEL_NONE as the default option.

        # Path to rig
        self.sources["RIG_PATHNAME"] = self.builder.get_object("hamlib_support_path_entry")
        (section, option) = ("hamlib", "rig_pathname")
        if(have_config and config.has_option(section, option)):
            self.sources["RIG_PATHNAME"].set_text(config.get(section, option))

        return

    @property
    def data(self):
        """ User preferences regarding Hamlib settings. """
        data = {}
        data["AUTOFILL"] = self.sources["AUTOFILL"].get_active()
        data["RIG_PATHNAME"] = self.sources["RIG_PATHNAME"].get_text()
        data["RIG_MODEL"] = self.sources["RIG_MODEL"].get_active_text()
        return data


class WorldMapPage:

    """ The section of the preferences dialog containing World Map preferences. """

    def __init__(self, parent, builder):
        """ Set up the World Map page of the Preferences dialog. """

        self.parent = parent
        self.builder = builder
        self.sources = {}

        # Remember that the have_config conditional in the PyQSO class may be out-of-date the next time the user opens up the preferences dialog
        # because a configuration file may have been created after launching the application. Let's check to see if one exists again...
        config = configparser.ConfigParser()
        have_config = (config.read(PREFERENCES_FILE) != [])

        # Option to pin-point QTH on grey line map.
        self.sources["SHOW_QTH"] = self.builder.get_object("world_map_show_qth_checkbutton")
        (section, option) = ("world_map", "show_qth")
        if(have_config and config.has_option(section, option)):
            self.sources["SHOW_QTH"].set_active(config.getboolean(section, option))
        else:
            self.sources["SHOW_QTH"].set_active(False)

        self.sources["QTH_NAME"] = self.builder.get_object("world_map_qth_name_entry")
        button = self.builder.get_object("world_map_qth_lookup")
        button.connect("clicked", self.lookup_callback)  # Uses geocoding to find the latitude-longitude coordinates.

        self.sources["QTH_LATITUDE"] = self.builder.get_object("world_map_qth_coordinates_latitude_entry")
        self.sources["QTH_LONGITUDE"] = self.builder.get_object("world_map_qth_coordinates_longitude_entry")

        (section, option) = ("world_map", "show_qth")
        # Disable the text entry boxes if the SHOW_QTH checkbox is not checked.
        if(have_config and config.has_option(section, option)):
            self.sources["QTH_NAME"].set_sensitive(self.sources["SHOW_QTH"].get_active())
            self.sources["QTH_LATITUDE"].set_sensitive(self.sources["SHOW_QTH"].get_active())
            self.sources["QTH_LONGITUDE"].set_sensitive(self.sources["SHOW_QTH"].get_active())
            button.set_sensitive(self.sources["SHOW_QTH"].get_active())
        else:
            self.sources["QTH_NAME"].set_sensitive(False)
            self.sources["QTH_LATITUDE"].set_sensitive(False)
            self.sources["QTH_LONGITUDE"].set_sensitive(False)
            button.set_sensitive(False)
        (section, option) = ("world_map", "qth_name")
        if(have_config and config.has_option(section, option)):
            self.sources["QTH_NAME"].set_text(config.get(section, option))
        (section, option) = ("world_map", "qth_latitude")
        if(have_config and config.has_option(section, option)):
            self.sources["QTH_LATITUDE"].set_text(config.get(section, option))
        (section, option) = ("world_map", "qth_longitude")
        if(have_config and config.has_option(section, option)):
            self.sources["QTH_LONGITUDE"].set_text(config.get(section, option))
        self.sources["SHOW_QTH"].connect("toggled", self.on_show_qth_toggled)

        # Option to show Maidenhead grid squares.
        self.sources["SHOW_GRID_SQUARES"] = self.builder.get_object("world_map_show_grid_squares_checkbutton")
        (section, option) = ("world_map", "show_grid_squares")
        if(have_config and config.has_option(section, option)):
            self.sources["SHOW_GRID_SQUARES"].set_active(config.getboolean(section, option))
        else:
            self.sources["SHOW_GRID_SQUARES"].set_active(False)

        # Option to shade in worked Maidenhead grid squares.
        self.sources["SHADE_WORKED_GRID_SQUARES"] = self.builder.get_object("world_map_shade_worked_grid_squares_checkbutton")
        (section, option) = ("world_map", "shade_worked_grid_squares")
        if(have_config and config.has_option(section, option)):
            self.sources["SHADE_WORKED_GRID_SQUARES"].set_active(config.getboolean(section, option))
        else:
            self.sources["SHADE_WORKED_GRID_SQUARES"].set_active(False)

        return

    @property
    def data(self):
        """ User preferences regarding World Map settings. """
        data = {}
        data["SHOW_QTH"] = self.sources["SHOW_QTH"].get_active()
        data["QTH_NAME"] = self.sources["QTH_NAME"].get_text()
        data["QTH_LATITUDE"] = self.sources["QTH_LATITUDE"].get_text()
        data["QTH_LONGITUDE"] = self.sources["QTH_LONGITUDE"].get_text()
        data["SHOW_GRID_SQUARES"] = self.sources["SHOW_GRID_SQUARES"].get_active()
        data["SHADE_WORKED_GRID_SQUARES"] = self.sources["SHADE_WORKED_GRID_SQUARES"].get_active()
        return data

    def on_show_qth_toggled(self, widget, data=None):
        if(widget.get_active()):
            self.sources["QTH_NAME"].set_sensitive(True)
            self.sources["QTH_LATITUDE"].set_sensitive(True)
            self.sources["QTH_LONGITUDE"].set_sensitive(True)
            self.builder.get_object("world_map_qth_lookup").set_sensitive(True)
        else:
            self.sources["QTH_NAME"].set_sensitive(False)
            self.sources["QTH_LATITUDE"].set_sensitive(False)
            self.sources["QTH_LONGITUDE"].set_sensitive(False)
            self.builder.get_object("world_map_qth_lookup").set_sensitive(False)
        return

    def lookup_callback(self, widget=None):
        """ Perform geocoding of the QTH location to obtain latitude-longitude coordinates. """
        if(not have_geocoder):
            error(parent=self.parent, message="Geocoder module could not be imported. Geocoding aborted.")
            return
        logging.debug("Geocoding QTH location...")
        name = self.sources["QTH_NAME"].get_text()
        try:
            g = geocoder.google(name)
            latitude, longitude = g.latlng
            self.sources["QTH_LATITUDE"].set_text(str(latitude))
            self.sources["QTH_LONGITUDE"].set_text(str(longitude))
            logging.debug("QTH coordinates found: (%s, %s)", str(latitude), str(longitude))
        except ValueError as e:
            error(parent=self.parent, message="Unable to lookup QTH coordinates. Is the QTH name correct?")
            logging.exception(e)
        except Exception as e:
            error(parent=self.parent, message="Unable to lookup QTH coordinates. Check connection to the internets? Lookup limit reached?")
            logging.exception(e)
        return
