import { useAtom } from 'jotai'
import { atomWithStorage } from 'jotai/utils'
import { useEffect } from 'react'
import { useUnitagByAddress } from 'uniswap/src/features/unitags/hooks'
import { shortenAddress } from 'utilities/src/addresses'
import { useAccount, useAccountEffect, useEnsName } from 'wagmi'

const recentAccountIdentifierMapAtom = atomWithStorage<{
  [account in string]?: { unitag?: string; ensName?: string }
}>('recentAccountIdentifierMap', { recent: {} })

// Returns an identifier for the current or recently connected account, prioritizing unitag -> ENS name -> address
export function useAccountIdentifier() {
  const [recentAccountIdentifierMap, updateRecentAccountIdentifierMap] = useAtom(recentAccountIdentifierMapAtom)
  const { address } = useAccount()

  const { unitag: unitagResponse } = useUnitagByAddress(address)
  const { data: ensNameResponse } = useEnsName({ address })

  // Clear the `recent` account identifier when the user disconnects
  useAccountEffect({
    onDisconnect() {
      updateRecentAccountIdentifierMap((prev) => ({ ...prev, recent: undefined }))
    },
  })

  // Keep the stored account identifiers synced with the latest unitag and ENS name
  useEffect(() => {
    if (!address) return
    updateRecentAccountIdentifierMap((prev) => {
      const updatedIdentifiers = prev[address] ?? {}
      if (unitagResponse) updatedIdentifiers.unitag = unitagResponse.username
      if (ensNameResponse) updatedIdentifiers.ensName = ensNameResponse

      return { ...prev, [address]: updatedIdentifiers, recent: updatedIdentifiers }
    })
  }, [address, unitagResponse, ensNameResponse, updateRecentAccountIdentifierMap])

  // If there is no account yet, optimistically use the stored `recent` account identifier
  const { unitag, ensName } =
    (address ? recentAccountIdentifierMap[address] : recentAccountIdentifierMap['recent']) ?? {}

  const accountIdentifier = unitag ?? ensName ?? shortenAddress(address)
  return {
    accountIdentifier,
    hasUnitag: Boolean(unitag),
    hasRecent: Boolean(Object.keys(recentAccountIdentifierMap['recent'] || {}).length),
  }
}
