// Copyright 2015, 2016 Ethcore (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 { api } from './parity';

import { eip20 as eip20Abi } from '../../contracts/abi';

export const getTokenTotalSupply = (tokenAddress) => {
  return api
    .eth
    .getCode(tokenAddress)
    .then(code => {
      if (!code || /^(0x)?0?$/.test(code)) {
        return null;
      }

      const contract = api.newContract(eip20Abi, tokenAddress);

      return contract
        .instance
        .totalSupply
        .call({}, []);
    });
};