// @flow
import WalletAddressValidator from 'wallet-address-validator';
import { normalise } from './ens';
import { toChecksumAddress } from 'ethereumjs-util';

export function isValidETHAddress(address: string): boolean {
  if (!address) {
    return false;
  }
  if (address == '0x0000000000000000000000000000000000000000') return false;
  return validateEtherAddress(address);
}

export function isValidBTCAddress(address: string): boolean {
  return WalletAddressValidator.validate(address, 'BTC');
}

export function isValidHex(str: string): boolean {
  if (typeof str !== 'string') {
    return false;
  }
  if (str === '') return true;
  str = str.substring(0, 2) == '0x'
    ? str.substring(2).toUpperCase()
    : str.toUpperCase();
  var re = /^[0-9A-F]+$/g;
  return re.test(str);
}

export function isValidENSorEtherAddress(address: string): boolean {
  return isValidETHAddress(address) || isValidENSAddress(address);
}

export function isValidENSName(str: string) {
  try {
    return (
      str.length > 6 && normalise(str) != '' && str.substring(0, 2) != '0x'
    );
  } catch (e) {
    return false;
  }
}

export function isValidENSAddress(address: string): boolean {
  try {
    const normalized = normalise(address);
    var tld = normalized.substr(normalized.lastIndexOf('.') + 1);
    var validTLDs = {
      eth: true,
      test: true,
      reverse: true
    };
    if (validTLDs[tld]) return true;
  } catch (e) {
    return false;
  }
  return false;
}

function isChecksumAddress(address: string): boolean {
  return address == toChecksumAddress(address);
}

// FIXME we probably want to do checksum checks sideways
function validateEtherAddress(address: string): boolean {
  if (address.substring(0, 2) != '0x') return false;
  else if (!/^(0x)?[0-9a-f]{40}$/i.test(address)) return false;
  else if (
    /^(0x)?[0-9a-f]{40}$/.test(address) ||
    /^(0x)?[0-9A-F]{40}$/.test(address)
  )
    return true;
  else return isChecksumAddress(address);
}

export function isValidPrivKey(length: number): boolean {
  return length === 64 || length === 128 || length === 132;
}