import * as chai from 'chai';

import {Artifacts} from '../../../util/artifacts';
import {Balances} from '../../../util/balances';
import {constants} from '../../../util/constants';
import {ContractInstance} from '../../../util/types';
import {chaiSetup} from '../utils/chai_setup';

chaiSetup.configure();
const expect = chai.expect;
const {
  TokenTransferProxy,
  DummyToken,
  TokenRegistry,
} = new Artifacts(artifacts);

contract('TokenTransferProxy', (accounts: string[]) => {
  const INIT_BAL = 100000000;
  const INIT_ALLOW = 100000000;

  const owner = accounts[0];
  const notAuthorized = owner;

  let tokenTransferProxy: ContractInstance;
  let tokenRegistry: ContractInstance;
  let rep: ContractInstance;
  let dmyBalances: Balances;

  before(async () => {
    [tokenTransferProxy, tokenRegistry] = await Promise.all([
      TokenTransferProxy.deployed(),
      TokenRegistry.deployed(),
    ]);
    const repAddress = await tokenRegistry.getTokenAddressBySymbol('REP');
    rep = DummyToken.at(repAddress);

    dmyBalances = new Balances([rep], [accounts[0], accounts[1]]);
    await Promise.all([
      rep.approve(TokenTransferProxy.address, INIT_ALLOW, {from: accounts[0]}),
      rep.setBalance(accounts[0], INIT_BAL, {from: owner}),
      rep.approve(TokenTransferProxy.address, INIT_ALLOW, {from: accounts[1]}),
      rep.setBalance(accounts[1], INIT_BAL, {from: owner}),
    ]);
  });

  describe('transferFrom', () => {
    it('should throw when called by an unauthorized address', async () => {
      expect(tokenTransferProxy.transferFrom(rep.address, accounts[0], accounts[1], 1000, {from: notAuthorized}))
        .to.be.rejectedWith(constants.INVALID_OPCODE);
    });

    it('should allow an authorized address to transfer', async () => {
      const balances = await dmyBalances.getAsync();

      await tokenTransferProxy.addAuthorizedAddress(notAuthorized, {from: owner});
      const transferAmt = 10000;
      await tokenTransferProxy.transferFrom(rep.address, accounts[0], accounts[1], transferAmt, {from: notAuthorized});

      const newBalances = await dmyBalances.getAsync();
      expect(newBalances[accounts[0]][rep.address])
        .to.be.bignumber.equal(balances[accounts[0]][rep.address].minus(transferAmt));
      expect(newBalances[accounts[1]][rep.address])
        .to.be.bignumber.equal(balances[accounts[1]][rep.address].add(transferAmt));
    });
  });
});