package fo

import (
	"math"
	"strconv"
	"time"

	"github.com/go-playground/locales"
	"github.com/go-playground/locales/currency"
)

type fo struct {
	locale                 string
	pluralsCardinal        []locales.PluralRule
	pluralsOrdinal         []locales.PluralRule
	pluralsRange           []locales.PluralRule
	decimal                string
	group                  string
	minus                  string
	percent                string
	percentSuffix          string
	perMille               string
	timeSeparator          string
	inifinity              string
	currencies             []string // idx = enum of currency code
	currencyPositiveSuffix string
	currencyNegativePrefix string
	currencyNegativeSuffix string
	monthsAbbreviated      []string
	monthsNarrow           []string
	monthsWide             []string
	daysAbbreviated        []string
	daysNarrow             []string
	daysShort              []string
	daysWide               []string
	periodsAbbreviated     []string
	periodsNarrow          []string
	periodsShort           []string
	periodsWide            []string
	erasAbbreviated        []string
	erasNarrow             []string
	erasWide               []string
	timezones              map[string]string
}

// New returns a new instance of translator for the 'fo' locale
func New() locales.Translator {
	return &fo{
		locale:                 "fo",
		pluralsCardinal:        []locales.PluralRule{2, 6},
		pluralsOrdinal:         nil,
		pluralsRange:           nil,
		decimal:                ",",
		group:                  ".",
		minus:                  "−",
		percent:                "%",
		perMille:               "‰",
		timeSeparator:          ":",
		inifinity:              "∞",
		currencies:             []string{"ADP ", "AED", "AFA ", "AFN", "ALK ", "ALL", "AMD", "ANG", "AOA", "AOK ", "AON ", "AOR ", "ARA ", "ARL ", "ARM ", "ARP ", "ARS", "ATS ", "A$", "AWG", "AZM ", "AZN", "BAD ", "BAM", "BAN ", "BBD", "BDT", "BEC ", "BEF ", "BEL ", "BGL ", "BGM ", "BGN", "BGO ", "BHD", "BIF", "BMD", "BND", "BOB", "BOL ", "BOP ", "BOV ", "BRB ", "BRC ", "BRE ", "R$", "BRN ", "BRR ", "BRZ ", "BSD", "BTN", "BUK ", "BWP", "BYB ", "BYR", "BZD", "CA$", "CDF", "CHE ", "CHF", "CHW ", "CLE ", "CLF ", "CLP", "CNX ", "CN¥", "COP", "COU ", "CRC", "CSD ", "CSK ", "CUC", "CUP", "CVE", "CYP ", "CZK", "DDM ", "DEM ", "DJF", "kr", "DOP", "DZD", "ECS ", "ECV ", "EEK ", "EGP", "ERN", "ESA ", "ESB ", "ESP ", "ETB", "€", "FIM ", "FJD", "FKP", "FRF ", "£", "GEK ", "GEL", "GHC ", "GHS", "GIP", "GMD", "GNF", "GNS ", "GQE ", "GRD ", "GTQ", "GWE ", "GWP ", "GYD", "HK$", "HNL", "HRD ", "HRK", "HTG", "HUF", "IDR", "IEP ", "ILP ", "ILR ", "₪", "₹", "IQD", "IRR", "ISJ ", "ISK", "ITL ", "JMD", "JOD", "JP¥", "KES", "KGS", "KHR", "KMF", "KPW", "KRH ", "KRO ", "₩", "KWD", "KYD", "KZT", "LAK", "LBP", "LKR", "LRD", "LSL ", "LTL ", "LTT ", "LUC ", "LUF ", "LUL ", "LVL ", "LVR ", "LYD", "MAD", "MAF ", "MCF ", "MDC ", "MDL", "MGA", "MGF ", "MKD", "MKN ", "MLF ", "MMK", "MNT", "MOP", "MRO", "MTL ", "MTP ", "MUR", "MVP ", "MVR", "MWK", "MX$", "MXP ", "MXV ", "MYR", "MZE ", "MZM ", "MZN", "NAD", "NGN", "NIC ", "NIO", "NLG ", "NOK", "NPR", "NZ$", "OMR", "PAB", "PEI ", "PEN", "PES ", "PGK", "PHP", "PKR", "PLN", "PLZ ", "PTE ", "PYG", "QAR", "RHD ", "ROL ", "RON", "RSD", "RUB", "RUR ", "RWF", "SAR", "SBD", "SCR", "SDD ", "SDG", "SDP ", "SEK", "SGD", "SHP", "SIT ", "SKK ", "SLL", "SOS", "SRD", "SRG ", "SSP", "STD", "SUR ", "SVC ", "SYP", "SZL", "THB", "TJR ", "TJS", "TMM ", "TMT", "TND", "TOP", "TPE ", "TRL ", "TRY", "TTD", "NT$", "TZS", "UAH", "UAK ", "UGS ", "UGX", "US$", "USN ", "USS ", "UYI ", "UYP ", "UYU", "UZS", "VEB ", "VEF", "₫", "VNN ", "VUV", "WST", "FCFA", "XAG ", "XAU ", "XBA ", "XBB ", "XBC ", "XBD ", "EC$", "XDR ", "XEU ", "XFO ", "XFU ", "CFA", "XPD ", "CFPF", "XPT ", "XRE ", "XSU ", "XTS ", "XUA ", "XXX ", "YDD ", "YER", "YUD ", "YUM ", "YUN ", "YUR ", "ZAL ", "ZAR", "ZMK ", "ZMW", "ZRN ", "ZRZ ", "ZWD ", "ZWL ", "ZWR "},
		percentSuffix:          " ",
		currencyPositiveSuffix: " ",
		currencyNegativePrefix: "(",
		currencyNegativeSuffix: " )",
		monthsAbbreviated:      []string{"", "jan.", "feb.", "mar.", "apr.", "mai", "jun.", "jul.", "aug.", "sep.", "okt.", "nov.", "des."},
		monthsNarrow:           []string{"", "J", "F", "M", "A", "M", "J", "J", "A", "S", "O", "N", "D"},
		monthsWide:             []string{"", "januar", "februar", "mars", "apríl", "mai", "juni", "juli", "august", "september", "oktober", "november", "desember"},
		daysAbbreviated:        []string{"sun.", "mán.", "týs.", "mik.", "hós.", "frí.", "ley."},
		daysNarrow:             []string{"S", "M", "T", "M", "H", "F", "L"},
		daysShort:              []string{"su.", "má.", "tý.", "mi.", "hó.", "fr.", "le."},
		daysWide:               []string{"sunnudagur", "mánadagur", "týsdagur", "mikudagur", "hósdagur", "fríggjadagur", "leygardagur"},
		periodsAbbreviated:     []string{"AM", "PM"},
		periodsNarrow:          []string{"AM", "PM"},
		periodsWide:            []string{"AM", "PM"},
		erasAbbreviated:        []string{"f.Kr.", "e.Kr."},
		erasNarrow:             []string{"fKr", "eKr"},
		erasWide:               []string{"fyri Krist", "eftir Krist"},
		timezones:              map[string]string{"CDT": "Central summartíð", "NZST": "Nýsæland vanlig tíð", "ADT": "Atlantic summartíð", "HNT": "Newfoundland vanlig tíð", "PDT": "Pacific summartíð", "WEZ": "Vesturevropa vanlig tíð", "CLT": "Kili vanlig tíð", "WITA": "Mið Indonesia tíð", "GYT": "Gujana tíð", "MEZ": "Miðevropa vanlig tíð", "EST": "Eastern vanlig tíð", "HAST": "Hawaii-Aleutian vanlig tíð", "IST": "India tíð", "ART": "Argentina vanlig tíð", "TMT": "Turkmenistan vanlig tíð", "LHDT": "Lord Howe summartíð", "UYT": "Uruguai vanlig tíð", "CLST": "Kili summartíð", "ECT": "Ekvador tíð", "ACDT": "mið Avstralia summartíð", "TMST": "Turkmenistan summartíð", "JDT": "Japan summartíð", "MDT": "Mountain summartíð", "WAST": "Vesturafrika summartíð", "OEZ": "Eysturevropa vanlig tíð", "AKST": "Alaska vanlig tíð", "AWDT": "vestur Avstralia summartíð", "MYT": "Malaisia tíð", "WART": "Vestur Argentina vanlig tíð", "MESZ": "Miðevropa summartíð", "VET": "Venesuela tíð", "WESZ": "Vesturevropa summartíð", "ACWDT": "miðvestur Avstralia summartíð", "MST": "Mountain vanlig tíð", "AST": "Atlantic vanlig tíð", "BT": "Butan tíð", "COST": "Kolombia summartíð", "JST": "Japan vanlig tíð", "ACWST": "miðvestur Avstralia vanlig tíð", "ACST": "mið Avstralia vanlig tíð", "SRT": "Surinam tíð", "AKDT": "Alaska summartíð", "AWST": "vestur Avstralia vanlig tíð", "UYST": "Uruguai summartíð", "ChST": "Chamorro vanlig tíð", "EDT": "Eastern summartíð", "WAT": "Vesturafrika vanlig tíð", "BOT": "Bolivia tíð", "CHADT": "Chatham summartíð", "OESZ": "Eysturevropa summartíð", "EAT": "Eysturafrika tíð", "CAT": "Miðafrika tíð", "COT": "Kolombia vanlig tíð", "GFT": "Franska Gujana tíð", "CST": "Central vanlig tíð", "CHAST": "Chatham vanlig tíð", "HADT": "Hawaii-Aleutian summartíð", "HKT": "Hong Kong vanlig tíð", "HKST": "Hong Kong summartíð", "WARST": "Vestur Argentina summartíð", "WIB": "Vestur Indonesia tíð", "AEST": "eystur Avstralia vanlig tíð", "GMT": "Greenwich Mean tíð", "HAT": "Newfoundland summartíð", "LHST": "Lord Howe vanlig tíð", "NZDT": "Nýsæland summartíð", "∅∅∅": "Brasilia summartíð", "SAST": "Suðurafrika vanlig tíð", "SGT": "Singapor tíð", "ARST": "Argentina summartíð", "AEDT": "eystur Avstralia summartíð", "WIT": "Eystur Indonesia tíð", "PST": "Pacific vanlig tíð"},
	}
}

// Locale returns the current translators string locale
func (fo *fo) Locale() string {
	return fo.locale
}

// PluralsCardinal returns the list of cardinal plural rules associated with 'fo'
func (fo *fo) PluralsCardinal() []locales.PluralRule {
	return fo.pluralsCardinal
}

// PluralsOrdinal returns the list of ordinal plural rules associated with 'fo'
func (fo *fo) PluralsOrdinal() []locales.PluralRule {
	return fo.pluralsOrdinal
}

// PluralsRange returns the list of range plural rules associated with 'fo'
func (fo *fo) PluralsRange() []locales.PluralRule {
	return fo.pluralsRange
}

// CardinalPluralRule returns the cardinal PluralRule given 'num' and digits/precision of 'v' for 'fo'
func (fo *fo) CardinalPluralRule(num float64, v uint64) locales.PluralRule {

	n := math.Abs(num)

	if n == 1 {
		return locales.PluralRuleOne
	}

	return locales.PluralRuleOther
}

// OrdinalPluralRule returns the ordinal PluralRule given 'num' and digits/precision of 'v' for 'fo'
func (fo *fo) OrdinalPluralRule(num float64, v uint64) locales.PluralRule {
	return locales.PluralRuleUnknown
}

// RangePluralRule returns the ordinal PluralRule given 'num1', 'num2' and digits/precision of 'v1' and 'v2' for 'fo'
func (fo *fo) RangePluralRule(num1 float64, v1 uint64, num2 float64, v2 uint64) locales.PluralRule {
	return locales.PluralRuleUnknown
}

// MonthAbbreviated returns the locales abbreviated month given the 'month' provided
func (fo *fo) MonthAbbreviated(month time.Month) string {
	return fo.monthsAbbreviated[month]
}

// MonthsAbbreviated returns the locales abbreviated months
func (fo *fo) MonthsAbbreviated() []string {
	return fo.monthsAbbreviated[1:]
}

// MonthNarrow returns the locales narrow month given the 'month' provided
func (fo *fo) MonthNarrow(month time.Month) string {
	return fo.monthsNarrow[month]
}

// MonthsNarrow returns the locales narrow months
func (fo *fo) MonthsNarrow() []string {
	return fo.monthsNarrow[1:]
}

// MonthWide returns the locales wide month given the 'month' provided
func (fo *fo) MonthWide(month time.Month) string {
	return fo.monthsWide[month]
}

// MonthsWide returns the locales wide months
func (fo *fo) MonthsWide() []string {
	return fo.monthsWide[1:]
}

// WeekdayAbbreviated returns the locales abbreviated weekday given the 'weekday' provided
func (fo *fo) WeekdayAbbreviated(weekday time.Weekday) string {
	return fo.daysAbbreviated[weekday]
}

// WeekdaysAbbreviated returns the locales abbreviated weekdays
func (fo *fo) WeekdaysAbbreviated() []string {
	return fo.daysAbbreviated
}

// WeekdayNarrow returns the locales narrow weekday given the 'weekday' provided
func (fo *fo) WeekdayNarrow(weekday time.Weekday) string {
	return fo.daysNarrow[weekday]
}

// WeekdaysNarrow returns the locales narrow weekdays
func (fo *fo) WeekdaysNarrow() []string {
	return fo.daysNarrow
}

// WeekdayShort returns the locales short weekday given the 'weekday' provided
func (fo *fo) WeekdayShort(weekday time.Weekday) string {
	return fo.daysShort[weekday]
}

// WeekdaysShort returns the locales short weekdays
func (fo *fo) WeekdaysShort() []string {
	return fo.daysShort
}

// WeekdayWide returns the locales wide weekday given the 'weekday' provided
func (fo *fo) WeekdayWide(weekday time.Weekday) string {
	return fo.daysWide[weekday]
}

// WeekdaysWide returns the locales wide weekdays
func (fo *fo) WeekdaysWide() []string {
	return fo.daysWide
}

// FmtNumber returns 'num' with digits/precision of 'v' for 'fo' and handles both Whole and Real numbers based on 'v'
func (fo *fo) FmtNumber(num float64, v uint64) string {

	s := strconv.FormatFloat(math.Abs(num), 'f', int(v), 64)
	l := len(s) + 4 + 1*len(s[:len(s)-int(v)-1])/3
	count := 0
	inWhole := v == 0
	b := make([]byte, 0, l)

	for i := len(s) - 1; i >= 0; i-- {

		if s[i] == '.' {
			b = append(b, fo.decimal[0])
			inWhole = true
			continue
		}

		if inWhole {
			if count == 3 {
				b = append(b, fo.group[0])
				count = 1
			} else {
				count++
			}
		}

		b = append(b, s[i])
	}

	if num < 0 {
		for j := len(fo.minus) - 1; j >= 0; j-- {
			b = append(b, fo.minus[j])
		}
	}

	// reverse
	for i, j := 0, len(b)-1; i < j; i, j = i+1, j-1 {
		b[i], b[j] = b[j], b[i]
	}

	return string(b)
}

// FmtPercent returns 'num' with digits/precision of 'v' for 'fo' and handles both Whole and Real numbers based on 'v'
// NOTE: 'num' passed into FmtPercent is assumed to be in percent already
func (fo *fo) FmtPercent(num float64, v uint64) string {
	s := strconv.FormatFloat(math.Abs(num), 'f', int(v), 64)
	l := len(s) + 7
	b := make([]byte, 0, l)

	for i := len(s) - 1; i >= 0; i-- {

		if s[i] == '.' {
			b = append(b, fo.decimal[0])
			continue
		}

		b = append(b, s[i])
	}

	if num < 0 {
		for j := len(fo.minus) - 1; j >= 0; j-- {
			b = append(b, fo.minus[j])
		}
	}

	// reverse
	for i, j := 0, len(b)-1; i < j; i, j = i+1, j-1 {
		b[i], b[j] = b[j], b[i]
	}

	b = append(b, fo.percentSuffix...)

	b = append(b, fo.percent...)

	return string(b)
}

// FmtCurrency returns the currency representation of 'num' with digits/precision of 'v' for 'fo'
func (fo *fo) FmtCurrency(num float64, v uint64, currency currency.Type) string {

	s := strconv.FormatFloat(math.Abs(num), 'f', int(v), 64)
	symbol := fo.currencies[currency]
	l := len(s) + len(symbol) + 6 + 1*len(s[:len(s)-int(v)-1])/3
	count := 0
	inWhole := v == 0
	b := make([]byte, 0, l)

	for i := len(s) - 1; i >= 0; i-- {

		if s[i] == '.' {
			b = append(b, fo.decimal[0])
			inWhole = true
			continue
		}

		if inWhole {
			if count == 3 {
				b = append(b, fo.group[0])
				count = 1
			} else {
				count++
			}
		}

		b = append(b, s[i])
	}

	if num < 0 {
		for j := len(fo.minus) - 1; j >= 0; j-- {
			b = append(b, fo.minus[j])
		}
	}

	// reverse
	for i, j := 0, len(b)-1; i < j; i, j = i+1, j-1 {
		b[i], b[j] = b[j], b[i]
	}

	if int(v) < 2 {

		if v == 0 {
			b = append(b, fo.decimal...)
		}

		for i := 0; i < 2-int(v); i++ {
			b = append(b, '0')
		}
	}

	b = append(b, fo.currencyPositiveSuffix...)

	b = append(b, symbol...)

	return string(b)
}

// FmtAccounting returns the currency representation of 'num' with digits/precision of 'v' for 'fo'
// in accounting notation.
func (fo *fo) FmtAccounting(num float64, v uint64, currency currency.Type) string {

	s := strconv.FormatFloat(math.Abs(num), 'f', int(v), 64)
	symbol := fo.currencies[currency]
	l := len(s) + len(symbol) + 8 + 1*len(s[:len(s)-int(v)-1])/3
	count := 0
	inWhole := v == 0
	b := make([]byte, 0, l)

	for i := len(s) - 1; i >= 0; i-- {

		if s[i] == '.' {
			b = append(b, fo.decimal[0])
			inWhole = true
			continue
		}

		if inWhole {
			if count == 3 {
				b = append(b, fo.group[0])
				count = 1
			} else {
				count++
			}
		}

		b = append(b, s[i])
	}

	if num < 0 {

		b = append(b, fo.currencyNegativePrefix[0])

	}

	// reverse
	for i, j := 0, len(b)-1; i < j; i, j = i+1, j-1 {
		b[i], b[j] = b[j], b[i]
	}

	if int(v) < 2 {

		if v == 0 {
			b = append(b, fo.decimal...)
		}

		for i := 0; i < 2-int(v); i++ {
			b = append(b, '0')
		}
	}

	if num < 0 {
		b = append(b, fo.currencyNegativeSuffix...)
		b = append(b, symbol...)
	} else {

		b = append(b, fo.currencyPositiveSuffix...)
		b = append(b, symbol...)
	}

	return string(b)
}

// FmtDateShort returns the short date representation of 't' for 'fo'
func (fo *fo) FmtDateShort(t time.Time) string {

	b := make([]byte, 0, 32)

	if t.Day() < 10 {
		b = append(b, '0')
	}

	b = strconv.AppendInt(b, int64(t.Day()), 10)
	b = append(b, []byte{0x2e}...)

	if t.Month() < 10 {
		b = append(b, '0')
	}

	b = strconv.AppendInt(b, int64(t.Month()), 10)

	b = append(b, []byte{0x2e}...)

	if t.Year() > 9 {
		b = append(b, strconv.Itoa(t.Year())[2:]...)
	} else {
		b = append(b, strconv.Itoa(t.Year())[1:]...)
	}

	return string(b)
}

// FmtDateMedium returns the medium date representation of 't' for 'fo'
func (fo *fo) FmtDateMedium(t time.Time) string {

	b := make([]byte, 0, 32)

	if t.Day() < 10 {
		b = append(b, '0')
	}

	b = strconv.AppendInt(b, int64(t.Day()), 10)
	b = append(b, []byte{0x2e}...)

	if t.Month() < 10 {
		b = append(b, '0')
	}

	b = strconv.AppendInt(b, int64(t.Month()), 10)

	b = append(b, []byte{0x2e}...)
	b = strconv.AppendInt(b, int64(t.Year()), 10)

	return string(b)
}

// FmtDateLong returns the long date representation of 't' for 'fo'
func (fo *fo) FmtDateLong(t time.Time) string {

	b := make([]byte, 0, 32)

	b = strconv.AppendInt(b, int64(t.Day()), 10)
	b = append(b, []byte{0x2e, 0x20}...)
	b = append(b, fo.monthsWide[t.Month()]...)
	b = append(b, []byte{0x20}...)
	b = strconv.AppendInt(b, int64(t.Year()), 10)

	return string(b)
}

// FmtDateFull returns the full date representation of 't' for 'fo'
func (fo *fo) FmtDateFull(t time.Time) string {

	b := make([]byte, 0, 32)

	b = append(b, fo.daysWide[t.Weekday()]...)
	b = append(b, []byte{0x2c, 0x20}...)
	b = strconv.AppendInt(b, int64(t.Day()), 10)
	b = append(b, []byte{0x2e, 0x20}...)
	b = append(b, fo.monthsWide[t.Month()]...)
	b = append(b, []byte{0x20}...)
	b = strconv.AppendInt(b, int64(t.Year()), 10)

	return string(b)
}

// FmtTimeShort returns the short time representation of 't' for 'fo'
func (fo *fo) FmtTimeShort(t time.Time) string {

	b := make([]byte, 0, 32)

	if t.Hour() < 10 {
		b = append(b, '0')
	}

	b = strconv.AppendInt(b, int64(t.Hour()), 10)
	b = append(b, fo.timeSeparator...)

	if t.Minute() < 10 {
		b = append(b, '0')
	}

	b = strconv.AppendInt(b, int64(t.Minute()), 10)

	return string(b)
}

// FmtTimeMedium returns the medium time representation of 't' for 'fo'
func (fo *fo) FmtTimeMedium(t time.Time) string {

	b := make([]byte, 0, 32)

	if t.Hour() < 10 {
		b = append(b, '0')
	}

	b = strconv.AppendInt(b, int64(t.Hour()), 10)
	b = append(b, fo.timeSeparator...)

	if t.Minute() < 10 {
		b = append(b, '0')
	}

	b = strconv.AppendInt(b, int64(t.Minute()), 10)
	b = append(b, fo.timeSeparator...)

	if t.Second() < 10 {
		b = append(b, '0')
	}

	b = strconv.AppendInt(b, int64(t.Second()), 10)

	return string(b)
}

// FmtTimeLong returns the long time representation of 't' for 'fo'
func (fo *fo) FmtTimeLong(t time.Time) string {

	b := make([]byte, 0, 32)

	if t.Hour() < 10 {
		b = append(b, '0')
	}

	b = strconv.AppendInt(b, int64(t.Hour()), 10)
	b = append(b, fo.timeSeparator...)

	if t.Minute() < 10 {
		b = append(b, '0')
	}

	b = strconv.AppendInt(b, int64(t.Minute()), 10)
	b = append(b, fo.timeSeparator...)

	if t.Second() < 10 {
		b = append(b, '0')
	}

	b = strconv.AppendInt(b, int64(t.Second()), 10)
	b = append(b, []byte{0x20}...)

	tz, _ := t.Zone()
	b = append(b, tz...)

	return string(b)
}

// FmtTimeFull returns the full time representation of 't' for 'fo'
func (fo *fo) FmtTimeFull(t time.Time) string {

	b := make([]byte, 0, 32)

	if t.Hour() < 10 {
		b = append(b, '0')
	}

	b = strconv.AppendInt(b, int64(t.Hour()), 10)
	b = append(b, fo.timeSeparator...)

	if t.Minute() < 10 {
		b = append(b, '0')
	}

	b = strconv.AppendInt(b, int64(t.Minute()), 10)
	b = append(b, fo.timeSeparator...)

	if t.Second() < 10 {
		b = append(b, '0')
	}

	b = strconv.AppendInt(b, int64(t.Second()), 10)
	b = append(b, []byte{0x20}...)

	tz, _ := t.Zone()

	if btz, ok := fo.timezones[tz]; ok {
		b = append(b, btz...)
	} else {
		b = append(b, tz...)
	}

	return string(b)
}
