import { Order } from '@0x/types';
import { BigNumber } from '@0x/utils';
import * as chai from 'chai';
import 'mocha';

import { orderHashUtils } from '../src';

import { constants } from '../src/constants';

import { chaiSetup } from './utils/chai_setup';

chaiSetup.configure();
const expect = chai.expect;

describe('Order hashing', () => {
    describe('#getOrderHashHex', () => {
        const expectedOrderHash = '0x434c6b41e2fb6dfcfe1b45c4492fb03700798e9c1afc6f801ba6203f948c1fa7';
        const fakeExchangeContractAddress = '0x1dc4c1cefef38a777b15aa20260a54e584b16c48';
        const order: Order = {
            makerAddress: constants.NULL_ADDRESS,
            takerAddress: constants.NULL_ADDRESS,
            senderAddress: constants.NULL_ADDRESS,
            feeRecipientAddress: constants.NULL_ADDRESS,
            makerAssetData: constants.NULL_ADDRESS,
            takerAssetData: constants.NULL_ADDRESS,
            exchangeAddress: fakeExchangeContractAddress,
            salt: new BigNumber(0),
            makerFee: new BigNumber(0),
            takerFee: new BigNumber(0),
            makerAssetAmount: new BigNumber(0),
            takerAssetAmount: new BigNumber(0),
            expirationTimeSeconds: new BigNumber(0),
        };
        it('calculates the order hash', async () => {
            const orderHash = orderHashUtils.getOrderHashHex(order);
            expect(orderHash).to.be.equal(expectedOrderHash);
        });
        it('calculates the order hash if amounts are strings', async () => {
            // It's common for developers using javascript to provide the amounts
            // as strings. Since we eventually toString() the BigNumber
            // before encoding we should result in the same orderHash in this scenario
            // tslint:disable-next-line:no-unnecessary-type-assertion
            const orderHash = orderHashUtils.getOrderHashHex({
                ...order,
                makerAssetAmount: '0',
                takerAssetAmount: '0',
                makerFee: '0',
                takerFee: '0',
            } as any);
            expect(orderHash).to.be.equal(expectedOrderHash);
        });
        it('throws a readable error message if taker format is invalid', async () => {
            const orderWithInvalidtakerFormat = {
                ...order,
                takerAddress: (null as any) as string,
            };
            const expectedErrorMessage =
                'Order taker must be of type string. If you want anyone to be able to fill an order - pass ZeroEx.NULL_ADDRESS';
            expect(() => orderHashUtils.getOrderHashHex(orderWithInvalidtakerFormat)).to.throw(expectedErrorMessage);
        });
    });
    describe('#isValidOrderHash', () => {
        it('returns false if the value is not a hex string', () => {
            const isValid = orderHashUtils.isValidOrderHash('not a hex');
            expect(isValid).to.be.false();
        });
        it('returns false if the length is wrong', () => {
            const isValid = orderHashUtils.isValidOrderHash('0xdeadbeef');
            expect(isValid).to.be.false();
        });
        it('returns true if order hash is correct', () => {
            const orderHashLength = 65;
            const isValid = orderHashUtils.isValidOrderHash('0x' + Array(orderHashLength).join('0'));
            expect(isValid).to.be.true();
        });
    });
});