import { cn } from '@/lib/utils'
import { useFavoriteRelaysActivity } from '@/providers/favorite-relays-activity-context'
import { RelayPulseActiveNpubsOpenButton } from './RelayPulseActiveNpubsSheet'
import type { TFunction } from 'i18next'
import { useEffect, useMemo, useState } from 'react'
import { useTranslation } from 'react-i18next'

function relativePastPhrase(timestampMs: number, t: TFunction): string {
  const sec = Math.floor((Date.now() - timestampMs) / 1000)
  if (sec < 45) return t('just now')
  const min = Math.floor(sec / 60)
  if (min < 60) return t('n minutes ago', { n: min })
  const h = Math.floor(min / 60)
  if (h < 48) return t('n hours ago', { n: h })
  const d = Math.floor(h / 24)
  return t('n days ago', { n: d })
}

function useRelativePastPhrase(timestampMs: number | null, t: TFunction): string {
  const [tick, setTick] = useState(0)
  useEffect(() => {
    if (timestampMs == null) return
    const id = window.setInterval(() => setTick((x) => x + 1), 30_000)
    return () => clearInterval(id)
  }, [timestampMs])
  return useMemo(() => {
    if (timestampMs == null) return ''
    return relativePastPhrase(timestampMs, t)
  }, [timestampMs, t, tick])
}

/** Home feed / mobile: full label above the page title */
export function FavoriteRelaysActiveStripMobileBar({ className }: { className?: string }) {
  const { t } = useTranslation()
  const { totalCount, loading, relayActivityReady, lastFetchedAtMs } = useFavoriteRelaysActivity()

  const relativeLabel = useRelativePastPhrase(lastFetchedAtMs, t)

  if (!relayActivityReady && !loading) {
    return (
      <div
        className={cn(
          'w-full min-w-0 max-w-full border-b border-border/60 bg-muted/15 px-3 py-2 sm:px-4 animate-pulse',
          className
        )}
      >
        <p className="text-xs font-medium text-foreground">{t('Relay pulse')}</p>
      </div>
    )
  }

  if (relayActivityReady && !loading && totalCount === 0) {
    return (
      <div
        className={cn(
          'w-full min-w-0 max-w-full border-b border-border/60 bg-muted/20 px-3 py-2 sm:px-4',
          className
        )}
      >
        <p className="text-xs font-medium text-foreground">{t('Relay pulse')}</p>
        {lastFetchedAtMs != null && relativeLabel ? (
          <p className="mt-0.5 text-[0.65rem] text-muted-foreground">
            {t('Relay pulse updated', { relative: relativeLabel })}
          </p>
        ) : null}
        <p className="mt-1 text-xs text-muted-foreground leading-snug">
          {t('Relay pulse empty')}
        </p>
      </div>
    )
  }

  return (
    <div
      className={cn(
        'w-full min-w-0 max-w-full border-b border-border/60 bg-muted/15 px-3 py-2 sm:px-4',
        loading && 'animate-pulse',
        className
      )}
    >
      <div className="flex w-full min-w-0 flex-col gap-1.5">
        <div className="flex min-w-0 max-w-full items-center justify-between gap-2">
          <div className="flex min-w-0 shrink items-center gap-2">
            <p className="text-xs font-medium leading-tight text-foreground">{t('Relay pulse')}</p>
            <RelayPulseActiveNpubsOpenButton size="sm" variant="outline" className="h-7 shrink-0" />
          </div>
          {lastFetchedAtMs != null && relativeLabel ? (
            <p className="shrink-0 text-[0.65rem] text-muted-foreground tabular-nums">
              {t('Relay pulse updated', { relative: relativeLabel })}
            </p>
          ) : null}
        </div>
      </div>
    </div>
  )
}

/** Desktop sidebar: compact row under nav */
export function FavoriteRelaysActiveStripSidebar({ className }: { className?: string }) {
  const { t } = useTranslation()
  const { totalCount, loading, relayActivityReady, lastFetchedAtMs } = useFavoriteRelaysActivity()

  const relativeLabel = useRelativePastPhrase(lastFetchedAtMs, t)

  if (!relayActivityReady && !loading) {
    return (
      <div
        className={cn(
          'px-1 py-2 xl:px-0 animate-pulse',
          className
        )}
      >
        <p className="text-[0.65rem] font-medium leading-snug text-foreground">
          {t('Relay pulse')}
        </p>
        <div className="mt-0.5 h-4 w-16 rounded bg-muted/50" aria-hidden />
      </div>
    )
  }

  if (relayActivityReady && !loading && totalCount === 0) {
    return (
      <div className={cn('hidden px-1 py-2 xl:block xl:px-0', className)}>
        <div className="flex flex-wrap items-center gap-1.5 px-1">
          <p className="text-[0.65rem] font-medium leading-snug text-foreground">{t('Relay pulse')}</p>
          <RelayPulseActiveNpubsOpenButton size="icon" variant="ghost" className="size-7 shrink-0" />
        </div>
        {lastFetchedAtMs != null && relativeLabel ? (
          <p className="mt-0.5 px-1 text-[0.6rem] text-muted-foreground tabular-nums">
            {t('Relay pulse updated', { relative: relativeLabel })}
          </p>
        ) : null}
        <p className="mt-1 px-1 text-[0.65rem] leading-snug text-muted-foreground">
          {t('Relay pulse empty')}
        </p>
      </div>
    )
  }

  return (
    <div
      className={cn(
        'px-1 py-2 xl:px-0',
        loading && 'animate-pulse',
        className
      )}
    >
      <div className="max-xl:hidden mb-0.5 flex flex-wrap items-center gap-1 px-1">
        <p className="min-w-0 flex-1 text-[0.65rem] font-medium leading-snug text-foreground">
          {t('Relay pulse')}
        </p>
        <div className="flex shrink-0 items-center gap-0.5">
          <RelayPulseActiveNpubsOpenButton size="icon" variant="ghost" className="size-7 shrink-0" />
        </div>
      </div>
      {lastFetchedAtMs != null && relativeLabel ? (
        <p className="max-xl:hidden mb-1.5 px-1 text-[0.6rem] text-muted-foreground tabular-nums">
          {t('Relay pulse updated', { relative: relativeLabel })}
        </p>
      ) : null}
      <div className="mb-1 flex justify-center gap-0.5 xl:hidden">
        <RelayPulseActiveNpubsOpenButton size="icon" variant="ghost" className="size-8 shrink-0" />
      </div>
    </div>
  )
}