explorer-monorepo/frontend/src/components/common/ClientRelativeTime.tsx

'use client'

import { useEffect, useState } from 'react'
import { formatRelativeAgeAt } from '@/utils/format'

const PLACEHOLDER = '…'

export default function ClientRelativeTime({
  value,
  prefix = '',
  suffix = '',
  fallback = 'Unknown',
  className,
}: {
  value?: string | null
  prefix?: string
  suffix?: string
  fallback?: string
  className?: string
}) {
  const [label, setLabel] = useState(PLACEHOLDER)

  useEffect(() => {
    if (!value) {
      setLabel(fallback)
      return
    }
    const parsed = Date.parse(value)
    if (!Number.isFinite(parsed)) {
      setLabel(fallback)
      return
    }
    const update = () => setLabel(formatRelativeAgeAt(Date.now(), value))
    update()
    const id = window.setInterval(update, 30_000)
    return () => window.clearInterval(id)
  }, [value, fallback])

  const content = label === PLACEHOLDER ? PLACEHOLDER : label
  if (className) {
    return (
      <span className={className} suppressHydrationWarning>
        {prefix}
        {content}
        {suffix}
      </span>
    )
  }

  return (
    <span suppressHydrationWarning>
      {prefix}
      {content}
      {suffix}
    </span>
  )
}