import MuteButton from '@/components/MuteButton'
import Nip05 from '@/components/Nip05'
import UserAvatar from '@/components/UserAvatar'
import Username from '@/components/Username'
import { useFetchProfile } from '@/hooks'
import SecondaryPageLayout from '@/layouts/SecondaryPageLayout'
import { useMuteList } from '@/providers/MuteListProvider'
import { useNostr } from '@/providers/NostrProvider'
import { useEffect, useRef, useState } from 'react'
import { useTranslation } from 'react-i18next'
import NotFoundPage from '../NotFoundPage'

export default function MuteListPage({ index }: { index?: number }) {
  const { t } = useTranslation()
  const { profile } = useNostr()
  const { mutePubkeys } = useMuteList()
  const [visibleMutePubkeys, setVisibleMutePubkeys] = useState<string[]>([])
  const bottomRef = useRef<HTMLDivElement>(null)

  useEffect(() => {
    setVisibleMutePubkeys(mutePubkeys.slice(0, 10))
  }, [mutePubkeys])

  useEffect(() => {
    const options = {
      root: null,
      rootMargin: '10px',
      threshold: 1
    }

    const observerInstance = new IntersectionObserver((entries) => {
      if (entries[0].isIntersecting && mutePubkeys.length > visibleMutePubkeys.length) {
        setVisibleMutePubkeys((prev) => [
          ...prev,
          ...mutePubkeys.slice(prev.length, prev.length + 10)
        ])
      }
    }, options)

    const currentBottomRef = bottomRef.current
    if (currentBottomRef) {
      observerInstance.observe(currentBottomRef)
    }

    return () => {
      if (observerInstance && currentBottomRef) {
        observerInstance.unobserve(currentBottomRef)
      }
    }
  }, [visibleMutePubkeys, mutePubkeys])

  if (!profile) {
    return <NotFoundPage />
  }

  return (
    <SecondaryPageLayout
      index={index}
      title={t("username's muted", { username: profile.username })}
      displayScrollToTopButton
    >
      <div className="space-y-2 px-4">
        {visibleMutePubkeys.map((pubkey, index) => (
          <UserItem key={`${index}-${pubkey}`} pubkey={pubkey} />
        ))}
        {mutePubkeys.length > visibleMutePubkeys.length && <div ref={bottomRef} />}
      </div>
    </SecondaryPageLayout>
  )
}

function UserItem({ pubkey }: { pubkey: string }) {
  const { profile } = useFetchProfile(pubkey)

  return (
    <div className="flex gap-2 items-start">
      <UserAvatar userId={pubkey} className="shrink-0" />
      <div className="w-full overflow-hidden">
        <Username userId={pubkey} className="font-semibold truncate" skeletonClassName="h-4" />
        <Nip05 pubkey={pubkey} />
        <div className="truncate text-muted-foreground text-sm">{profile?.about}</div>
      </div>
      <MuteButton pubkey={pubkey} />
    </div>
  )
}
