// Copyright 2015, 2016 Parity Technologies (UK) Ltd.
// This file is part of Parity.

// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Parity.  If not, see <http://www.gnu.org/licenses/>.

import CryptoJS from 'crypto-js';
import CryptoSha3 from 'crypto-js/sha3';

export function sha3 (value, options) {
  if (options && options.encoding === 'hex') {
    if (value.length > 2 && value.substr(0, 2) === '0x') {
      value = value.substr(2);
    }

    value = CryptoJS.enc.Hex.parse(value);
  }

  const hash = CryptoSha3(value, {
    outputLength: 256
  }).toString();

  return `0x${hash}`;
}