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# -*- coding: utf-8 -*-

# Copyright (c) 2014 - 2019 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a dialog to select a time zone.
"""

from __future__ import unicode_literals

from PyQt5.QtCore import pyqtSlot
from PyQt5.QtWidgets import QDialog, QDialogButtonBox

from .Ui_TimezoneSelectionDialog import Ui_TimezoneSelectionDialog


class TimezoneSelectionDialog(QDialog, Ui_TimezoneSelectionDialog):
    """
    Class implementing a dialog to select a time zone.
    """
    Timezones = {
        'Africa': [
            'Abidjan',
            'Accra',
            'Addis_Ababa',
            'Algiers',
            'Asmara',
            'Asmera',
            'Bamako',
            'Bangui',
            'Banjul',
            'Bissau',
            'Blantyre',
            'Brazzaville',
            'Bujumbura',
            'Cairo',
            'Casablanca',
            'Ceuta',
            'Conakry',
            'Dakar',
            'Dar_es_Salaam',
            'Djibouti',
            'Douala',
            'El_Aaiun',
            'Freetown',
            'Gaborone',
            'Harare',
            'Johannesburg',
            'Juba',
            'Kampala',
            'Khartoum',
            'Kigali',
            'Kinshasa',
            'Lagos',
            'Libreville',
            'Lome',
            'Luanda',
            'Lubumbashi',
            'Lusaka',
            'Malabo',
            'Maputo',
            'Maseru',
            'Mbabane',
            'Mogadishu',
            'Monrovia',
            'Nairobi',
            'Ndjamena',
            'Niamey',
            'Nouakchott',
            'Ouagadougou',
            'Porto-Novo',
            'Sao_Tome',
            'Timbuktu',
            'Tripoli',
            'Tunis',
            'Windhoek',
        ],
        'America': [
            'Adak',
            'Anchorage',
            'Anguilla',
            'Antigua',
            'Araguaina',
            'Argentina/Buenos_Aires',
            'Argentina/Catamarca',
            'Argentina/ComodRivadavia',
            'Argentina/Cordoba',
            'Argentina/Jujuy',
            'Argentina/La_Rioja',
            'Argentina/Mendoza',
            'Argentina/Rio_Gallegos',
            'Argentina/Salta',
            'Argentina/San_Juan',
            'Argentina/San_Luis',
            'Argentina/Tucuman',
            'Argentina/Ushuaia',
            'Aruba',
            'Asuncion',
            'Atikokan',
            'Atka',
            'Bahia',
            'Bahia_Banderas',
            'Barbados',
            'Belem',
            'Belize',
            'Blanc-Sablon',
            'Boa_Vista',
            'Bogota',
            'Boise',
            'Buenos_Aires',
            'Cambridge_Bay',
            'Campo_Grande',
            'Cancun',
            'Caracas',
            'Catamarca',
            'Cayenne',
            'Cayman',
            'Chicago',
            'Chihuahua',
            'Coral_Harbour',
            'Cordoba',
            'Costa_Rica',
            'Creston',
            'Cuiaba',
            'Curacao',
            'Danmarkshavn',
            'Dawson',
            'Dawson_Creek',
            'Denver',
            'Detroit',
            'Dominica',
            'Edmonton',
            'Eirunepe',
            'El_Salvador',
            'Ensenada',
            'Fort_Wayne',
            'Fortaleza',
            'Glace_Bay',
            'Godthab',
            'Goose_Bay',
            'Grand_Turk',
            'Grenada',
            'Guadeloupe',
            'Guatemala',
            'Guayaquil',
            'Guyana',
            'Halifax',
            'Havana',
            'Hermosillo',
            'Indiana/Indianapolis',
            'Indiana/Knox',
            'Indiana/Marengo',
            'Indiana/Petersburg',
            'Indiana/Tell_City',
            'Indiana/Vevay',
            'Indiana/Vincennes',
            'Indiana/Winamac',
            'Indianapolis',
            'Inuvik',
            'Iqaluit',
            'Jamaica',
            'Jujuy',
            'Juneau',
            'Kentucky/Louisville',
            'Kentucky/Monticello',
            'Knox_IN',
            'Kralendijk',
            'La_Paz',
            'Lima',
            'Los_Angeles',
            'Louisville',
            'Lower_Princes',
            'Maceio',
            'Managua',
            'Manaus',
            'Marigot',
            'Martinique',
            'Matamoros',
            'Mazatlan',
            'Mendoza',
            'Menominee',
            'Merida',
            'Metlakatla',
            'Mexico_City',
            'Miquelon',
            'Moncton',
            'Monterrey',
            'Montevideo',
            'Montreal',
            'Montserrat',
            'Nassau',
            'New_York',
            'Nipigon',
            'Nome',
            'Noronha',
            'North_Dakota/Beulah',
            'North_Dakota/Center',
            'North_Dakota/New_Salem',
            'Ojinaga',
            'Panama',
            'Pangnirtung',
            'Paramaribo',
            'Phoenix',
            'Port-au-Prince',
            'Port_of_Spain',
            'Porto_Acre',
            'Porto_Velho',
            'Puerto_Rico',
            'Rainy_River',
            'Rankin_Inlet',
            'Recife',
            'Regina',
            'Resolute',
            'Rio_Branco',
            'Rosario',
            'Santa_Isabel',
            'Santarem',
            'Santiago',
            'Santo_Domingo',
            'Sao_Paulo',
            'Scoresbysund',
            'Shiprock',
            'Sitka',
            'St_Barthelemy',
            'St_Johns',
            'St_Kitts',
            'St_Lucia',
            'St_Thomas',
            'St_Vincent',
            'Swift_Current',
            'Tegucigalpa',
            'Thule',
            'Thunder_Bay',
            'Tijuana',
            'Toronto',
            'Tortola',
            'Vancouver',
            'Virgin',
            'Whitehorse',
            'Winnipeg',
            'Yakutat',
            'Yellowknife',
        ],
        'Antarctica': [
            'Casey',
            'Davis',
            'DumontDUrville',
            'Macquarie',
            'Mawson',
            'McMurdo',
            'Palmer',
            'Rothera',
            'South_Pole',
            'Syowa',
            'Vostok',
        ],
        'Arctic': [
            'Longyearbyen',
        ],
        'Asia': [
            'Aden',
            'Almaty',
            'Amman',
            'Anadyr',
            'Aqtau',
            'Aqtobe',
            'Ashgabat',
            'Ashkhabad',
            'Baghdad',
            'Bahrain',
            'Baku',
            'Bangkok',
            'Beirut',
            'Bishkek',
            'Brunei',
            'Calcutta',
            'Choibalsan',
            'Chongqing',
            'Chungking',
            'Colombo',
            'Dacca',
            'Damascus',
            'Dhaka',
            'Dili',
            'Dubai',
            'Dushanbe',
            'Gaza',
            'Harbin',
            'Hebron',
            'Ho_Chi_Minh',
            'Hong_Kong',
            'Hovd',
            'Irkutsk',
            'Istanbul',
            'Jakarta',
            'Jayapura',
            'Jerusalem',
            'Kabul',
            'Kamchatka',
            'Karachi',
            'Kashgar',
            'Kathmandu',
            'Katmandu',
            'Khandyga',
            'Kolkata',
            'Krasnoyarsk',
            'Kuala_Lumpur',
            'Kuching',
            'Kuwait',
            'Macao',
            'Macau',
            'Magadan',
            'Makassar',
            'Manila',
            'Muscat',
            'Nicosia',
            'Novokuznetsk',
            'Novosibirsk',
            'Omsk',
            'Oral',
            'Phnom_Penh',
            'Pontianak',
            'Pyongyang',
            'Qatar',
            'Qyzylorda',
            'Rangoon',
            'Riyadh',
            'Saigon',
            'Sakhalin',
            'Samarkand',
            'Seoul',
            'Shanghai',
            'Singapore',
            'Taipei',
            'Tashkent',
            'Tbilisi',
            'Tehran',
            'Tel_Aviv',
            'Thimbu',
            'Thimphu',
            'Tokyo',
            'Ujung_Pandang',
            'Ulaanbaatar',
            'Ulan_Bator',
            'Urumqi',
            'Ust-Nera',
            'Vientiane',
            'Vladivostok',
            'Yakutsk',
            'Yekaterinburg',
            'Yerevan',
        ],
        'Atlantic': [
            'Azores',
            'Bermuda',
            'Canary',
            'Cape_Verde',
            'Faeroe',
            'Faroe',
            'Jan_Mayen',
            'Madeira',
            'Reykjavik',
            'South_Georgia',
            'St_Helena',
            'Stanley',
        ],
        'Australia': [
            'ACT',
            'Adelaide',
            'Brisbane',
            'Broken_Hill',
            'Canberra',
            'Currie',
            'Darwin',
            'Eucla',
            'Hobart',
            'LHI',
            'Lindeman',
            'Lord_Howe',
            'Melbourne',
            'NSW',
            'North',
            'Perth',
            'Queensland',
            'South',
            'Sydney',
            'Tasmania',
            'Victoria',
            'West',
            'Yancowinna',
        ],
        'Europe': [
            'Amsterdam',
            'Andorra',
            'Athens',
            'Belfast',
            'Belgrade',
            'Berlin',
            'Bratislava',
            'Brussels',
            'Bucharest',
            'Budapest',
            'Busingen',
            'Chisinau',
            'Copenhagen',
            'Dublin',
            'Gibraltar',
            'Guernsey',
            'Helsinki',
            'Isle_of_Man',
            'Istanbul',
            'Jersey',
            'Kaliningrad',
            'Kiev',
            'Lisbon',
            'Ljubljana',
            'London',
            'Luxembourg',
            'Madrid',
            'Malta',
            'Mariehamn',
            'Minsk',
            'Monaco',
            'Moscow',
            'Nicosia',
            'Oslo',
            'Paris',
            'Podgorica',
            'Prague',
            'Riga',
            'Rome',
            'Samara',
            'San_Marino',
            'Sarajevo',
            'Simferopol',
            'Skopje',
            'Sofia',
            'Stockholm',
            'Tallinn',
            'Tirane',
            'Tiraspol',
            'Uzhgorod',
            'Vaduz',
            'Vatican',
            'Vienna',
            'Vilnius',
            'Volgograd',
            'Warsaw',
            'Zagreb',
            'Zaporozhye',
            'Zurich',
        ],
        'Indian': [
            'Antananarivo',
            'Chagos',
            'Christmas',
            'Cocos',
            'Comoro',
            'Kerguelen',
            'Mahe',
            'Maldives',
            'Mauritius',
            'Mayotte',
            'Reunion',
        ],
        'Pacific': [
            'Apia',
            'Auckland',
            'Chatham',
            'Chuuk',
            'Easter',
            'Efate',
            'Enderbury',
            'Fakaofo',
            'Fiji',
            'Funafuti',
            'Galapagos',
            'Gambier',
            'Guadalcanal',
            'Guam',
            'Honolulu',
            'Johnston',
            'Kiritimati',
            'Kosrae',
            'Kwajalein',
            'Majuro',
            'Marquesas',
            'Midway',
            'Nauru',
            'Niue',
            'Norfolk',
            'Noumea',
            'Pago_Pago',
            'Palau',
            'Pitcairn',
            'Pohnpei',
            'Ponape',
            'Port_Moresby',
            'Rarotonga',
            'Saipan',
            'Samoa',
            'Tahiti',
            'Tarawa',
            'Tongatapu',
            'Truk',
            'Wake',
            'Wallis',
            'Yap',
        ],
    }
    
    def __init__(self, parent=None):
        """
        Constructor
        
        @param parent reference to the parent widget (QWidget)
        """
        super(TimezoneSelectionDialog, self).__init__(parent)
        self.setupUi(self)
        
        self.buttonBox.button(QDialogButtonBox.Ok).setEnabled(False)
        
        self.regionCombo.addItems([" "] + sorted(self.Timezones.keys()))
    
    def __updateOK(self):
        """
        Private method to update the OK button.
        """
        self.buttonBox.button(QDialogButtonBox.Ok).setEnabled(
            bool(self.regionCombo.currentText()) and
            len(self.cityList.selectedItems()) == 1
        )
    
    @pyqtSlot(str)
    def on_regionCombo_currentIndexChanged(self, region):
        """
        Private slot handling the selection of a time zone region.
        
        @param region selected region (string)
        """
        self.cityList.clear()
        if region in self.Timezones:
            self.cityList.addItems(sorted(self.Timezones[region]))
        
        self.__updateOK()
    
    @pyqtSlot()
    def on_cityList_itemSelectionChanged(self):
        """
        Private slot handling a change of the city selection.
        """
        self.__updateOK()
    
    def getData(self):
        """
        Public method to retrieve the data.
        
        @return selected time zone (string)
        """
        if (self.regionCombo.currentText() and
                len(self.cityList.selectedItems()) == 1):
            return "{0}/{1}".format(
                self.regionCombo.currentText(),
                self.cityList.selectedItems()[0].text()
            )
        else:
            return ""
    
    @staticmethod
    def getTimezone(parent=None):
        """
        Public static method to select a time zone.
        
        @param parent reference to the parent widget (QWidget)
        @return tuple of selected time zone (string) and flag indicating
            the acceptance state (boolean)
        """
        dlg = TimezoneSelectionDialog(parent)
        tz = ""
        if dlg.exec_() == QDialog.Accepted:
            tz = dlg.getData()
        return tz, bool(tz)