import { captureError } from '../errors'
import { lieProps } from '../lies'
import { hashMini } from '../utils/crypto'
import { createTimer, logTestResult, performanceLogger, hashSlice, LowerEntropy } from '../utils/helpers'
import { HTMLNote } from '../utils/html'

export default function getTimezone() {
	// inspired by https://arkenfox.github.io/TZP
	// https://github.com/vvo/tzdb/blob/master/time-zones-names.json
	const cities = [
		'UTC',
		'GMT',
		'Etc/GMT+0',
		'Etc/GMT+1',
		'Etc/GMT+10',
		'Etc/GMT+11',
		'Etc/GMT+12',
		'Etc/GMT+2',
		'Etc/GMT+3',
		'Etc/GMT+4',
		'Etc/GMT+5',
		'Etc/GMT+6',
		'Etc/GMT+7',
		'Etc/GMT+8',
		'Etc/GMT+9',
		'Etc/GMT-1',
		'Etc/GMT-10',
		'Etc/GMT-11',
		'Etc/GMT-12',
		'Etc/GMT-13',
		'Etc/GMT-14',
		'Etc/GMT-2',
		'Etc/GMT-3',
		'Etc/GMT-4',
		'Etc/GMT-5',
		'Etc/GMT-6',
		'Etc/GMT-7',
		'Etc/GMT-8',
		'Etc/GMT-9',
		'Etc/GMT',
		'Africa/Abidjan',
		'Africa/Accra',
		'Africa/Addis_Ababa',
		'Africa/Algiers',
		'Africa/Asmara',
		'Africa/Bamako',
		'Africa/Bangui',
		'Africa/Banjul',
		'Africa/Bissau',
		'Africa/Blantyre',
		'Africa/Brazzaville',
		'Africa/Bujumbura',
		'Africa/Cairo',
		'Africa/Casablanca',
		'Africa/Ceuta',
		'Africa/Conakry',
		'Africa/Dakar',
		'Africa/Dar_es_Salaam',
		'Africa/Djibouti',
		'Africa/Douala',
		'Africa/El_Aaiun',
		'Africa/Freetown',
		'Africa/Gaborone',
		'Africa/Harare',
		'Africa/Johannesburg',
		'Africa/Juba',
		'Africa/Kampala',
		'Africa/Khartoum',
		'Africa/Kigali',
		'Africa/Kinshasa',
		'Africa/Lagos',
		'Africa/Libreville',
		'Africa/Lome',
		'Africa/Luanda',
		'Africa/Lubumbashi',
		'Africa/Lusaka',
		'Africa/Malabo',
		'Africa/Maputo',
		'Africa/Maseru',
		'Africa/Mbabane',
		'Africa/Mogadishu',
		'Africa/Monrovia',
		'Africa/Nairobi',
		'Africa/Ndjamena',
		'Africa/Niamey',
		'Africa/Nouakchott',
		'Africa/Ouagadougou',
		'Africa/Porto-Novo',
		'Africa/Sao_Tome',
		'Africa/Tripoli',
		'Africa/Tunis',
		'Africa/Windhoek',
		'America/Adak',
		'America/Anchorage',
		'America/Anguilla',
		'America/Antigua',
		'America/Araguaina',
		'America/Argentina/Buenos_Aires',
		'America/Argentina/Catamarca',
		'America/Argentina/Cordoba',
		'America/Argentina/Jujuy',
		'America/Argentina/La_Rioja',
		'America/Argentina/Mendoza',
		'America/Argentina/Rio_Gallegos',
		'America/Argentina/Salta',
		'America/Argentina/San_Juan',
		'America/Argentina/San_Luis',
		'America/Argentina/Tucuman',
		'America/Argentina/Ushuaia',
		'America/Aruba',
		'America/Asuncion',
		'America/Atikokan',
		'America/Bahia',
		'America/Bahia_Banderas',
		'America/Barbados',
		'America/Belem',
		'America/Belize',
		'America/Blanc-Sablon',
		'America/Boa_Vista',
		'America/Bogota',
		'America/Boise',
		'America/Cambridge_Bay',
		'America/Campo_Grande',
		'America/Cancun',
		'America/Caracas',
		'America/Cayenne',
		'America/Cayman',
		'America/Chicago',
		'America/Chihuahua',
		'America/Costa_Rica',
		'America/Creston',
		'America/Cuiaba',
		'America/Curacao',
		'America/Danmarkshavn',
		'America/Dawson',
		'America/Dawson_Creek',
		'America/Denver',
		'America/Detroit',
		'America/Dominica',
		'America/Edmonton',
		'America/Eirunepe',
		'America/El_Salvador',
		'America/Fort_Nelson',
		'America/Fortaleza',
		'America/Glace_Bay',
		'America/Godthab',
		'America/Goose_Bay',
		'America/Grand_Turk',
		'America/Grenada',
		'America/Guadeloupe',
		'America/Guatemala',
		'America/Guayaquil',
		'America/Guyana',
		'America/Halifax',
		'America/Havana',
		'America/Hermosillo',
		'America/Indiana/Indianapolis',
		'America/Indiana/Knox',
		'America/Indiana/Marengo',
		'America/Indiana/Petersburg',
		'America/Indiana/Tell_City',
		'America/Indiana/Vevay',
		'America/Indiana/Vincennes',
		'America/Indiana/Winamac',
		'America/Inuvik',
		'America/Iqaluit',
		'America/Jamaica',
		'America/Juneau',
		'America/Kentucky/Louisville',
		'America/Kentucky/Monticello',
		'America/Kralendijk',
		'America/La_Paz',
		'America/Lima',
		'America/Los_Angeles',
		'America/Lower_Princes',
		'America/Maceio',
		'America/Managua',
		'America/Manaus',
		'America/Marigot',
		'America/Martinique',
		'America/Matamoros',
		'America/Mazatlan',
		'America/Menominee',
		'America/Merida',
		'America/Metlakatla',
		'America/Mexico_City',
		'America/Miquelon',
		'America/Moncton',
		'America/Monterrey',
		'America/Montevideo',
		'America/Montserrat',
		'America/Nassau',
		'America/New_York',
		'America/Nipigon',
		'America/Nome',
		'America/Noronha',
		'America/North_Dakota/Beulah',
		'America/North_Dakota/Center',
		'America/North_Dakota/New_Salem',
		'America/Ojinaga',
		'America/Panama',
		'America/Pangnirtung',
		'America/Paramaribo',
		'America/Phoenix',
		'America/Port-au-Prince',
		'America/Port_of_Spain',
		'America/Porto_Velho',
		'America/Puerto_Rico',
		'America/Punta_Arenas',
		'America/Rainy_River',
		'America/Rankin_Inlet',
		'America/Recife',
		'America/Regina',
		'America/Resolute',
		'America/Rio_Branco',
		'America/Santarem',
		'America/Santiago',
		'America/Santo_Domingo',
		'America/Sao_Paulo',
		'America/Scoresbysund',
		'America/Sitka',
		'America/St_Barthelemy',
		'America/St_Johns',
		'America/St_Kitts',
		'America/St_Lucia',
		'America/St_Thomas',
		'America/St_Vincent',
		'America/Swift_Current',
		'America/Tegucigalpa',
		'America/Thule',
		'America/Thunder_Bay',
		'America/Tijuana',
		'America/Toronto',
		'America/Tortola',
		'America/Vancouver',
		'America/Whitehorse',
		'America/Winnipeg',
		'America/Yakutat',
		'America/Yellowknife',
		'Antarctica/Casey',
		'Antarctica/Davis',
		'Antarctica/DumontDUrville',
		'Antarctica/Macquarie',
		'Antarctica/Mawson',
		'Antarctica/McMurdo',
		'Antarctica/Palmer',
		'Antarctica/Rothera',
		'Antarctica/Syowa',
		'Antarctica/Troll',
		'Antarctica/Vostok',
		'Arctic/Longyearbyen',
		'Asia/Aden',
		'Asia/Almaty',
		'Asia/Amman',
		'Asia/Anadyr',
		'Asia/Aqtau',
		'Asia/Aqtobe',
		'Asia/Ashgabat',
		'Asia/Atyrau',
		'Asia/Baghdad',
		'Asia/Bahrain',
		'Asia/Baku',
		'Asia/Bangkok',
		'Asia/Barnaul',
		'Asia/Beirut',
		'Asia/Bishkek',
		'Asia/Brunei',
		'Asia/Calcutta',
		'Asia/Chita',
		'Asia/Choibalsan',
		'Asia/Colombo',
		'Asia/Damascus',
		'Asia/Dhaka',
		'Asia/Dili',
		'Asia/Dubai',
		'Asia/Dushanbe',
		'Asia/Famagusta',
		'Asia/Gaza',
		'Asia/Hebron',
		'Asia/Ho_Chi_Minh',
		'Asia/Hong_Kong',
		'Asia/Hovd',
		'Asia/Irkutsk',
		'Asia/Jakarta',
		'Asia/Jayapura',
		'Asia/Jerusalem',
		'Asia/Kabul',
		'Asia/Kamchatka',
		'Asia/Karachi',
		'Asia/Kathmandu',
		'Asia/Khandyga',
		'Asia/Kolkata',
		'Asia/Krasnoyarsk',
		'Asia/Kuala_Lumpur',
		'Asia/Kuching',
		'Asia/Kuwait',
		'Asia/Macau',
		'Asia/Magadan',
		'Asia/Makassar',
		'Asia/Manila',
		'Asia/Muscat',
		'Asia/Nicosia',
		'Asia/Novokuznetsk',
		'Asia/Novosibirsk',
		'Asia/Omsk',
		'Asia/Oral',
		'Asia/Phnom_Penh',
		'Asia/Pontianak',
		'Asia/Pyongyang',
		'Asia/Qatar',
		'Asia/Qostanay',
		'Asia/Qyzylorda',
		'Asia/Riyadh',
		'Asia/Sakhalin',
		'Asia/Samarkand',
		'Asia/Seoul',
		'Asia/Shanghai',
		'Asia/Singapore',
		'Asia/Srednekolymsk',
		'Asia/Taipei',
		'Asia/Tashkent',
		'Asia/Tbilisi',
		'Asia/Tehran',
		'Asia/Thimphu',
		'Asia/Tokyo',
		'Asia/Tomsk',
		'Asia/Ulaanbaatar',
		'Asia/Urumqi',
		'Asia/Ust-Nera',
		'Asia/Vientiane',
		'Asia/Vladivostok',
		'Asia/Yakutsk',
		'Asia/Yangon',
		'Asia/Yekaterinburg',
		'Asia/Yerevan',
		'Atlantic/Azores',
		'Atlantic/Bermuda',
		'Atlantic/Canary',
		'Atlantic/Cape_Verde',
		'Atlantic/Faroe',
		'Atlantic/Madeira',
		'Atlantic/Reykjavik',
		'Atlantic/South_Georgia',
		'Atlantic/St_Helena',
		'Atlantic/Stanley',
		'Australia/Adelaide',
		'Australia/Brisbane',
		'Australia/Broken_Hill',
		'Australia/Currie',
		'Australia/Darwin',
		'Australia/Eucla',
		'Australia/Hobart',
		'Australia/Lindeman',
		'Australia/Lord_Howe',
		'Australia/Melbourne',
		'Australia/Perth',
		'Australia/Sydney',
		'Europe/Amsterdam',
		'Europe/Andorra',
		'Europe/Astrakhan',
		'Europe/Athens',
		'Europe/Belgrade',
		'Europe/Berlin',
		'Europe/Bratislava',
		'Europe/Brussels',
		'Europe/Bucharest',
		'Europe/Budapest',
		'Europe/Busingen',
		'Europe/Chisinau',
		'Europe/Copenhagen',
		'Europe/Dublin',
		'Europe/Gibraltar',
		'Europe/Guernsey',
		'Europe/Helsinki',
		'Europe/Isle_of_Man',
		'Europe/Istanbul',
		'Europe/Jersey',
		'Europe/Kaliningrad',
		'Europe/Kiev',
		'Europe/Kirov',
		'Europe/Lisbon',
		'Europe/Ljubljana',
		'Europe/London',
		'Europe/Luxembourg',
		'Europe/Madrid',
		'Europe/Malta',
		'Europe/Mariehamn',
		'Europe/Minsk',
		'Europe/Monaco',
		'Europe/Moscow',
		'Europe/Oslo',
		'Europe/Paris',
		'Europe/Podgorica',
		'Europe/Prague',
		'Europe/Riga',
		'Europe/Rome',
		'Europe/Samara',
		'Europe/San_Marino',
		'Europe/Sarajevo',
		'Europe/Saratov',
		'Europe/Simferopol',
		'Europe/Skopje',
		'Europe/Sofia',
		'Europe/Stockholm',
		'Europe/Tallinn',
		'Europe/Tirane',
		'Europe/Ulyanovsk',
		'Europe/Uzhgorod',
		'Europe/Vaduz',
		'Europe/Vatican',
		'Europe/Vienna',
		'Europe/Vilnius',
		'Europe/Volgograd',
		'Europe/Warsaw',
		'Europe/Zagreb',
		'Europe/Zaporozhye',
		'Europe/Zurich',
		'Indian/Antananarivo',
		'Indian/Chagos',
		'Indian/Christmas',
		'Indian/Cocos',
		'Indian/Comoro',
		'Indian/Kerguelen',
		'Indian/Mahe',
		'Indian/Maldives',
		'Indian/Mauritius',
		'Indian/Mayotte',
		'Indian/Reunion',
		'Pacific/Apia',
		'Pacific/Auckland',
		'Pacific/Bougainville',
		'Pacific/Chatham',
		'Pacific/Chuuk',
		'Pacific/Easter',
		'Pacific/Efate',
		'Pacific/Enderbury',
		'Pacific/Fakaofo',
		'Pacific/Fiji',
		'Pacific/Funafuti',
		'Pacific/Galapagos',
		'Pacific/Gambier',
		'Pacific/Guadalcanal',
		'Pacific/Guam',
		'Pacific/Honolulu',
		'Pacific/Kiritimati',
		'Pacific/Kosrae',
		'Pacific/Kwajalein',
		'Pacific/Majuro',
		'Pacific/Marquesas',
		'Pacific/Midway',
		'Pacific/Nauru',
		'Pacific/Niue',
		'Pacific/Norfolk',
		'Pacific/Noumea',
		'Pacific/Pago_Pago',
		'Pacific/Palau',
		'Pacific/Pitcairn',
		'Pacific/Pohnpei',
		'Pacific/Port_Moresby',
		'Pacific/Rarotonga',
		'Pacific/Saipan',
		'Pacific/Tahiti',
		'Pacific/Tarawa',
		'Pacific/Tongatapu',
		'Pacific/Wake',
		'Pacific/Wallis',
	]

	const getTimezoneOffset = () => {
		const [year, month, day] = JSON.stringify(new Date())
			.slice(1, 11)
			.split('-')
		const dateString = `${month}/${day}/${year}`
		const dateStringUTC = `${year}-${month}-${day}`
		const now = +new Date(dateString)
		const utc = +new Date(dateStringUTC)
		const offset = +((now - utc)/60000)
		return ~~offset
	}

	const getTimezoneOffsetHistory = ({ year, city = null }) => {
		const format = {
			timeZone: '',
			year: 'numeric',
			month: 'numeric',
			day: 'numeric',
			hour: 'numeric',
			minute: 'numeric',
			second: 'numeric',
		}
		const minute = 60000
		let formatter; let summer
		if (city) {
			const options = {
				...format,
				timeZone: city,
			}
			// @ts-ignore
			formatter = new Intl.DateTimeFormat('en', options)
			summer = +new Date(formatter.format(new Date(`7/1/${year}`)))
		} else {
			summer = +new Date(`7/1/${year}`)
		}
		const summerUTCTime = +new Date(`${year}-07-01`)
		const offset = (summer - summerUTCTime) / minute
		return offset
	}

	const binarySearch = (list, fn) => {
		const end = list.length
		const middle = Math.floor(end / 2)
		const [left, right] = [list.slice(0, middle), list.slice(middle, end)]
		const found = fn(left)
		return end == 1 || found.length ? found : binarySearch(right, fn)
	}

	const decryptLocation = ({ year, timeZone }) => {
		const system = getTimezoneOffsetHistory({ year })
		const resolvedOptions = getTimezoneOffsetHistory({ year, city: timeZone })
		const filter = (cities) => cities
			.filter((city) => system == getTimezoneOffsetHistory({ year, city }))

		// get city region set
		const decryption = (
			system == resolvedOptions ? [timeZone] : binarySearch(cities, filter)
		)

		// reduce set to one city
		const decrypted = (
			decryption.length == 1 && decryption[0] == timeZone ? timeZone : hashMini(decryption)
		)
		return decrypted
	}

	const formatLocation = (x) => {
		try {
			return x.replace(/_/, ' ').split('/').join(', ')
		} catch (error) {}
		return x
	}

	try {
		const timer = createTimer()
		timer.start()

		const lied = (
			lieProps['Date.getTimezoneOffset'] ||
			lieProps['Intl.DateTimeFormat.resolvedOptions'] ||
			lieProps['Intl.RelativeTimeFormat.resolvedOptions']
		) || false

		const year = 1113
		// eslint-disable-next-line new-cap
		const { timeZone } = Intl.DateTimeFormat().resolvedOptions()
		const decrypted = decryptLocation({ year, timeZone })
		const locationEpoch = +new Date(new Date(`7/1/${year}`))
		const notWithinParentheses = /.*\(|\).*/g
		const data = {
			zone: (''+new Date()).replace(notWithinParentheses, ''),
			location: formatLocation(timeZone),
			locationMeasured: formatLocation(decrypted),
			locationEpoch,
			offset: new Date().getTimezoneOffset(),
			offsetComputed: getTimezoneOffset(),
			lied,
		}
		logTestResult({ time: timer.stop(), test: 'timezone', passed: true })
		return { ...data }
	} catch (error) {
		logTestResult({ test: 'timezone', passed: false })
		captureError(error)
		return
	}
}

export function timezoneHTML(fp) {
	if (!fp.timezone) {
		return `
		<div class="col-six undefined">
			<strong>Timezone</strong>
			<div class="block-text">${HTMLNote.BLOCKED}</div>
		</div>`
	}
	const {
		timezone: {
			$hash,
			zone,
			location,
			locationMeasured,
			locationEpoch,
			offset,
			offsetComputed,
			lied,
		},
	} = fp
	return `
	<div class="relative col-six${lied ? ' rejected' : ''}">
		<span class="aside-note">${performanceLogger.getLog().timezone}</span>
		<strong>Timezone</strong><span class="${lied ? 'lies ' : LowerEntropy.TIME_ZONE ? 'bold-fail ' : ''}hash">${hashSlice($hash)}</span>
		<div class="block-text help"  title="Date\nDate.getTimezoneOffset\nIntl.DateTimeFormat">
			${zone ? zone : ''}
			<br>${location != locationMeasured ? locationMeasured : location}
			<br>${locationEpoch}
			<br>${offset != offsetComputed ? offsetComputed : offset}
		</div>
	</div>
	`
}