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.REVERT);
        });

        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),
            );
        });
    });
});