import React, { useMemo } from 'react'
import { Link } from 'react-router-dom'
import { useEventModel } from 'applesauce-react/hooks'
import { Hooks } from 'applesauce-react'
import { Models, Helpers } from 'applesauce-core'
import { decode, npubEncode } from 'nostr-tools/nip19'
import { getProfileDisplayName } from '../utils/nostrUriResolver'
import { isProfileInCacheOrStore } from '../utils/profileLoadingUtils'

const { getPubkeyFromDecodeResult } = Helpers

interface ResolvedMentionProps {
  encoded?: string
}

const ResolvedMention: React.FC<ResolvedMentionProps> = ({ encoded }) => {
  if (!encoded) return null
  let pubkey: string | undefined
  try {
    pubkey = getPubkeyFromDecodeResult(decode(encoded))
  } catch {
    // ignore; will fallback to showing the encoded value
  }

  const eventStore = Hooks.useEventStore()
  const profile = pubkey ? useEventModel(Models.ProfileModel, [pubkey]) : undefined
  
  // Check if profile is in cache or eventStore
  const isInCacheOrStore = useMemo(() => {
    if (!pubkey) return false
    return isProfileInCacheOrStore(pubkey, eventStore)
  }, [pubkey, eventStore])
  
  // Show loading if profile doesn't exist and not in cache/store
  const isLoading = !profile && pubkey && !isInCacheOrStore
  
  const display = pubkey ? getProfileDisplayName(profile, pubkey) : encoded
  const npub = pubkey ? npubEncode(pubkey) : undefined

  if (npub) {
    const className = isLoading ? 'nostr-mention profile-loading' : 'nostr-mention'
    return (
      <Link
        to={`/p/${npub}`}
        className={className}
      >
        @{display}
      </Link>
    )
  }

  return <span className="nostr-mention">{encoded}</span>
}

export default ResolvedMention