import { useEffect, useMemo, useRef, useState } from 'react'
import { useWeb3React } from '@web3-react/core'
import Web3 from 'web3'

import { defaultEVMNetworkId } from '@contracts/networks'

import { web3NoAccountInstances } from '@utils/web3'

export const useWeb3 = () => {
  const { library, chainId } = useWeb3React()
  const web3NoAccount = useMemo(
    () =>
      web3NoAccountInstances[
        chainId ? chainId.toString() : defaultEVMNetworkId
      ],
    [chainId]
  )
  const refChainId = useRef(chainId)
  const refWeb3 = useRef(library)
  const [web3, setweb3] = useState(library ? new Web3(library) : web3NoAccount)

  useEffect(() => {
    if (library !== refWeb3.current || chainId !== refChainId.current) {
      setweb3(library ? new Web3(library) : web3NoAccount)
      refWeb3.current = library
      refChainId.current = chainId
    }
  }, [chainId, library, web3NoAccount])

  return web3
}