import { t } from '@/i18n'
import { formatAbsoluteDateFromIso } from '@/lib/relativeDate'
import type { ApiKey } from '@/composables/useApiKeys'

const VISIBLE_PREFIX_LENGTH = 9
const END_OF_DAY = { hours: 23, minutes: 59, seconds: 59 }
const MINUTES_PER_HOUR = 60

export function displayPrefix(prefix: string) {
	return `${prefix.slice(0, VISIBLE_PREFIX_LENGTH)}…`
}

function twoDigits(value: number) {
	return String(value).padStart(2, '0')
}

function localEndOfDay(dateValue: string) {
	const [year, month, day] = dateValue.split('-').map(Number)
	return new Date(
		year!,
		month! - 1,
		day,
		END_OF_DAY.hours,
		END_OF_DAY.minutes,
		END_OF_DAY.seconds,
	)
}

function localOffset(date: Date) {
	const totalMinutes = -date.getTimezoneOffset()
	const sign = totalMinutes < 0 ? '-' : '+'
	const absolute = Math.abs(totalMinutes)
	return `${sign}${twoDigits(Math.floor(absolute / MINUTES_PER_HOUR))}:${twoDigits(absolute % MINUTES_PER_HOUR)}`
}

export function expiryInstant(dateValue: string) {
	const date = localEndOfDay(dateValue)
	const day = `${date.getFullYear()}-${twoDigits(date.getMonth() + 1)}-${twoDigits(date.getDate())}`
	return `${day}T${twoDigits(date.getHours())}:${twoDigits(date.getMinutes())}:${twoDigits(date.getSeconds())}${localOffset(date)}`
}

export function isFutureExpiry(dateValue: string, now: Date = new Date()) {
	return localEndOfDay(dateValue).getTime() > now.getTime()
}

export function formatKeyDate(iso: string | null, emptyLabel: string) {
	return iso ? formatAbsoluteDateFromIso(iso) : emptyLabel
}

export function lastUsedLabel(key: ApiKey) {
	return formatKeyDate(key.last_used_at, t('Never'))
}

export function expiresLabel(key: ApiKey) {
	return formatKeyDate(key.expires_at, t('None'))
}

export function creatorLabel(key: ApiKey) {
	return key.created_by_name || '—'
}