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import {useCallback} from 'react'
import {msg, plural} from '@lingui/macro'
import {I18nContext, useLingui} from '@lingui/react'
import {differenceInSeconds} from 'date-fns'
export type TimeAgoOptions = {
lingui: I18nContext['_']
format?: 'long' | 'short'
}
export function useGetTimeAgo() {
const {_} = useLingui()
return useCallback(
(
earlier: number | string | Date,
later: number | string | Date,
options?: Omit<TimeAgoOptions, 'lingui'>,
) => {
return dateDiff(earlier, later, {lingui: _, format: options?.format})
},
[_],
)
}
const NOW = 5
const MINUTE = 60
const HOUR = MINUTE * 60
const DAY = HOUR * 24
const MONTH_30 = DAY * 30
/**
* Returns the difference between `earlier` and `later` dates, formatted as a
* natural language string.
*
* - All month are considered exactly 30 days.
* - Dates assume `earlier` <= `later`, and will otherwise return 'now'.
* - Differences >= 360 days are returned as the "M/D/YYYY" string
* - All values round down
*/
export function dateDiff(
earlier: number | string | Date,
later: number | string | Date,
options: TimeAgoOptions,
): string {
const _ = options.lingui
const format = options?.format || 'short'
const long = format === 'long'
const diffSeconds = differenceInSeconds(new Date(later), new Date(earlier))
if (diffSeconds < NOW) {
return _(msg`now`)
} else if (diffSeconds < MINUTE) {
return `${diffSeconds}${
long ? ` ${plural(diffSeconds, {one: 'second', other: 'seconds'})}` : 's'
}`
} else if (diffSeconds < HOUR) {
const diff = Math.floor(diffSeconds / MINUTE)
return `${diff}${
long ? ` ${plural(diff, {one: 'minute', other: 'minutes'})}` : 'm'
}`
} else if (diffSeconds < DAY) {
const diff = Math.floor(diffSeconds / HOUR)
return `${diff}${
long ? ` ${plural(diff, {one: 'hour', other: 'hours'})}` : 'h'
}`
} else if (diffSeconds < MONTH_30) {
const diff = Math.floor(diffSeconds / DAY)
return `${diff}${
long ? ` ${plural(diff, {one: 'day', other: 'days'})}` : 'd'
}`
} else {
const diff = Math.floor(diffSeconds / MONTH_30)
if (diff < 12) {
return `${diff}${
long ? ` ${plural(diff, {one: 'month', other: 'months'})}` : 'mo'
}`
} else {
const str = new Date(earlier).toLocaleDateString()
if (long) {
return _(msg`on ${str}`)
}
return str
}
}
}
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