import {
    blockchainTests,
    constants,
    expect,
    getRandomInteger,
    getRandomPortion,
    randomAddress,
} from '@0x/contracts-test-utils';
import { Order } from '@0x/types';
import { BigNumber, hexUtils } from '@0x/utils';
import * as _ from 'lodash';

import { artifacts } from './artifacts';
import { TestERC20BridgeSamplerContract } from './wrappers';

blockchainTests('erc20-bridge-sampler', env => {
    let testContract: TestERC20BridgeSamplerContract;
    const RATE_DENOMINATOR = constants.ONE_ETHER;
    const MIN_RATE = new BigNumber('0.01');
    const MAX_RATE = new BigNumber('100');
    const MIN_DECIMALS = 4;
    const MAX_DECIMALS = 20;
    const WETH_ADDRESS = '0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2';
    const KYBER_SALT = '0x0ff3ca9d46195c39f9a12afb74207b4970349fb3cfb1e459bbf170298d326bc7';
    const ETH2DAI_SALT = '0xb713b61bb9bb2958a0f5d1534b21e94fc68c4c0c034b0902ed844f2f6cd1b4f7';
    const UNISWAP_BASE_SALT = '0x1d6a6a0506b0b4a554b907a4c29d9f4674e461989d9c1921feb17b26716385ab';
    const ERC20_PROXY_ID = '0xf47261b0';
    const INVALID_TOKEN_PAIR_ERROR = 'ERC20BridgeSampler/INVALID_TOKEN_PAIR';
    const MAKER_TOKEN = randomAddress();
    const TAKER_TOKEN = randomAddress();

    before(async () => {
        testContract = await TestERC20BridgeSamplerContract.deployFrom0xArtifactAsync(
            artifacts.TestERC20BridgeSampler,
            env.provider,
            env.txDefaults,
            {},
        );
    });

    function getPackedHash(...args: string[]): string {
        return hexUtils.hash(hexUtils.concat(...args.map(a => hexUtils.toHex(a))));
    }

    function getUniswapExchangeSalt(tokenAddress: string): string {
        return getPackedHash(UNISWAP_BASE_SALT, tokenAddress);
    }

    function getDeterministicRate(salt: string, sellToken: string, buyToken: string): BigNumber {
        const hash = getPackedHash(salt, sellToken, buyToken);
        const _minRate = RATE_DENOMINATOR.times(MIN_RATE);
        const _maxRate = RATE_DENOMINATOR.times(MAX_RATE);
        return new BigNumber(hash)
            .mod(_maxRate.minus(_minRate))
            .plus(_minRate)
            .div(RATE_DENOMINATOR);
    }

    function getDeterministicTokenDecimals(token: string): number {
        if (token === WETH_ADDRESS) {
            return 18;
        }
        // HACK(dorothy-zbornak): Linter will complain about the addition not being
        // between two numbers, even though they are.
        // tslint:disable-next-line restrict-plus-operands
        return new BigNumber(getPackedHash(token)).mod(MAX_DECIMALS - MIN_DECIMALS).toNumber() + MIN_DECIMALS;
    }

    function getDeterministicSellQuote(
        salt: string,
        sellToken: string,
        buyToken: string,
        sellAmount: BigNumber,
    ): BigNumber {
        const sellBase = new BigNumber(10).pow(getDeterministicTokenDecimals(sellToken));
        const buyBase = new BigNumber(10).pow(getDeterministicTokenDecimals(buyToken));
        const rate = getDeterministicRate(salt, sellToken, buyToken);
        return sellAmount
            .times(rate)
            .times(buyBase)
            .dividedToIntegerBy(sellBase);
    }

    function getDeterministicBuyQuote(
        salt: string,
        sellToken: string,
        buyToken: string,
        buyAmount: BigNumber,
    ): BigNumber {
        const sellBase = new BigNumber(10).pow(getDeterministicTokenDecimals(sellToken));
        const buyBase = new BigNumber(10).pow(getDeterministicTokenDecimals(buyToken));
        const rate = getDeterministicRate(salt, sellToken, buyToken);
        return buyAmount
            .times(sellBase)
            .dividedToIntegerBy(rate)
            .dividedToIntegerBy(buyBase);
    }

    function areAddressesEqual(a: string, b: string): boolean {
        return a.toLowerCase() === b.toLowerCase();
    }

    function getDeterministicUniswapSellQuote(sellToken: string, buyToken: string, sellAmount: BigNumber): BigNumber {
        if (areAddressesEqual(buyToken, WETH_ADDRESS)) {
            return getDeterministicSellQuote(getUniswapExchangeSalt(sellToken), sellToken, WETH_ADDRESS, sellAmount);
        }
        if (areAddressesEqual(sellToken, WETH_ADDRESS)) {
            return getDeterministicSellQuote(getUniswapExchangeSalt(buyToken), buyToken, WETH_ADDRESS, sellAmount);
        }
        const ethBought = getDeterministicSellQuote(
            getUniswapExchangeSalt(sellToken),
            sellToken,
            WETH_ADDRESS,
            sellAmount,
        );
        return getDeterministicSellQuote(getUniswapExchangeSalt(buyToken), buyToken, WETH_ADDRESS, ethBought);
    }

    function getDeterministicUniswapBuyQuote(sellToken: string, buyToken: string, buyAmount: BigNumber): BigNumber {
        if (areAddressesEqual(buyToken, WETH_ADDRESS)) {
            return getDeterministicBuyQuote(getUniswapExchangeSalt(sellToken), WETH_ADDRESS, sellToken, buyAmount);
        }
        if (areAddressesEqual(sellToken, WETH_ADDRESS)) {
            return getDeterministicBuyQuote(getUniswapExchangeSalt(buyToken), WETH_ADDRESS, buyToken, buyAmount);
        }
        const ethSold = getDeterministicBuyQuote(getUniswapExchangeSalt(buyToken), WETH_ADDRESS, buyToken, buyAmount);
        return getDeterministicBuyQuote(getUniswapExchangeSalt(sellToken), WETH_ADDRESS, sellToken, ethSold);
    }

    function getDeterministicSellQuotes(
        sellToken: string,
        buyToken: string,
        sources: string[],
        sampleAmounts: BigNumber[],
    ): BigNumber[][] {
        const quotes: BigNumber[][] = [];
        for (const source of sources) {
            const sampleOutputs = [];
            for (const amount of sampleAmounts) {
                if (source === 'Kyber' || source === 'Eth2Dai') {
                    sampleOutputs.push(
                        getDeterministicSellQuote(
                            source === 'Kyber' ? KYBER_SALT : ETH2DAI_SALT,
                            sellToken,
                            buyToken,
                            amount,
                        ),
                    );
                } else if (source === 'Uniswap') {
                    sampleOutputs.push(getDeterministicUniswapSellQuote(sellToken, buyToken, amount));
                }
            }
            quotes.push(sampleOutputs);
        }
        return quotes;
    }

    function getDeterministicBuyQuotes(
        sellToken: string,
        buyToken: string,
        sources: string[],
        sampleAmounts: BigNumber[],
    ): BigNumber[][] {
        const quotes: BigNumber[][] = [];
        for (const source of sources) {
            const sampleOutputs = [];
            for (const amount of sampleAmounts) {
                if (source === 'Eth2Dai') {
                    sampleOutputs.push(getDeterministicBuyQuote(ETH2DAI_SALT, sellToken, buyToken, amount));
                } else if (source === 'Uniswap') {
                    sampleOutputs.push(getDeterministicUniswapBuyQuote(sellToken, buyToken, amount));
                }
            }
            quotes.push(sampleOutputs);
        }
        return quotes;
    }

    function getDeterministicFillableTakerAssetAmount(order: Order): BigNumber {
        const hash = getPackedHash(hexUtils.leftPad(order.salt));
        const orderStatus = new BigNumber(hash).mod(100).toNumber() > 90 ? 5 : 3;
        const isValidSignature = !!new BigNumber(hash).mod(2).toNumber();
        if (orderStatus !== 3 || !isValidSignature) {
            return constants.ZERO_AMOUNT;
        }
        return order.takerAssetAmount.minus(new BigNumber(hash).mod(order.takerAssetAmount));
    }

    function getDeterministicFillableMakerAssetAmount(order: Order): BigNumber {
        const takerAmount = getDeterministicFillableTakerAssetAmount(order);
        return order.makerAssetAmount
            .times(takerAmount)
            .div(order.takerAssetAmount)
            .integerValue(BigNumber.ROUND_UP);
    }

    function getERC20AssetData(tokenAddress: string): string {
        return hexUtils.concat(ERC20_PROXY_ID, hexUtils.leftPad(tokenAddress));
    }

    function getSampleAmounts(tokenAddress: string, count?: number): BigNumber[] {
        const tokenDecimals = getDeterministicTokenDecimals(tokenAddress);
        const _upperLimit = getRandomPortion(getRandomInteger(1, 1000).times(10 ** tokenDecimals));
        const _count = count || _.random(1, 16);
        const d = _upperLimit.div(_count);
        return _.times(_count, i => d.times((i + 1) / _count).integerValue());
    }

    function createOrder(makerToken: string, takerToken: string): Order {
        return {
            chainId: 1337,
            exchangeAddress: randomAddress(),
            makerAddress: randomAddress(),
            takerAddress: randomAddress(),
            senderAddress: randomAddress(),
            feeRecipientAddress: randomAddress(),
            makerAssetAmount: getRandomInteger(1, 1e18),
            takerAssetAmount: getRandomInteger(1, 1e18),
            makerFee: getRandomInteger(1, 1e18),
            takerFee: getRandomInteger(1, 1e18),
            makerAssetData: getERC20AssetData(makerToken),
            takerAssetData: getERC20AssetData(takerToken),
            makerFeeAssetData: getERC20AssetData(randomAddress()),
            takerFeeAssetData: getERC20AssetData(randomAddress()),
            salt: new BigNumber(hexUtils.random()),
            expirationTimeSeconds: getRandomInteger(0, 2 ** 32),
        };
    }

    function createOrders(makerToken: string, takerToken: string, count?: number): Order[] {
        return _.times(count || _.random(1, 16), () => createOrder(makerToken, takerToken));
    }

    async function enableFailTriggerAsync(): Promise<void> {
        await testContract.enableFailTrigger().awaitTransactionSuccessAsync({ value: 1 });
    }

    describe('getOrderFillableTakerAssetAmounts()', () => {
        it('returns the expected amount for each order', async () => {
            const orders = createOrders(MAKER_TOKEN, TAKER_TOKEN);
            const signatures: string[] = _.times(orders.length, i => hexUtils.random());
            const expected = orders.map(getDeterministicFillableTakerAssetAmount);
            const actual = await testContract.getOrderFillableTakerAssetAmounts(orders, signatures).callAsync();
            expect(actual).to.deep.eq(expected);
        });

        it('returns empty for no orders', async () => {
            const actual = await testContract.getOrderFillableTakerAssetAmounts([], []).callAsync();
            expect(actual).to.deep.eq([]);
        });

        it('returns zero for an order with zero maker asset amount', async () => {
            const orders = createOrders(MAKER_TOKEN, TAKER_TOKEN, 1);
            orders[0].makerAssetAmount = constants.ZERO_AMOUNT;
            const signatures: string[] = _.times(orders.length, i => hexUtils.random());
            const actual = await testContract.getOrderFillableTakerAssetAmounts(orders, signatures).callAsync();
            expect(actual).to.deep.eq([constants.ZERO_AMOUNT]);
        });

        it('returns zero for an order with zero taker asset amount', async () => {
            const orders = createOrders(MAKER_TOKEN, TAKER_TOKEN, 1);
            orders[0].takerAssetAmount = constants.ZERO_AMOUNT;
            const signatures: string[] = _.times(orders.length, i => hexUtils.random());
            const actual = await testContract.getOrderFillableTakerAssetAmounts(orders, signatures).callAsync();
            expect(actual).to.deep.eq([constants.ZERO_AMOUNT]);
        });

        it('returns zero for an order with an empty signature', async () => {
            const orders = createOrders(MAKER_TOKEN, TAKER_TOKEN, 1);
            const signatures: string[] = _.times(orders.length, () => constants.NULL_BYTES);
            const actual = await testContract.getOrderFillableTakerAssetAmounts(orders, signatures).callAsync();
            expect(actual).to.deep.eq([constants.ZERO_AMOUNT]);
        });
    });

    describe('getOrderFillableMakerAssetAmounts()', () => {
        it('returns the expected amount for each order', async () => {
            const orders = createOrders(MAKER_TOKEN, TAKER_TOKEN);
            const signatures: string[] = _.times(orders.length, i => hexUtils.random());
            const expected = orders.map(getDeterministicFillableMakerAssetAmount);
            const actual = await testContract.getOrderFillableMakerAssetAmounts(orders, signatures).callAsync();
            expect(actual).to.deep.eq(expected);
        });

        it('returns empty for no orders', async () => {
            const actual = await testContract.getOrderFillableMakerAssetAmounts([], []).callAsync();
            expect(actual).to.deep.eq([]);
        });

        it('returns zero for an order with zero maker asset amount', async () => {
            const orders = createOrders(MAKER_TOKEN, TAKER_TOKEN, 1);
            orders[0].makerAssetAmount = constants.ZERO_AMOUNT;
            const signatures: string[] = _.times(orders.length, i => hexUtils.random());
            const actual = await testContract.getOrderFillableMakerAssetAmounts(orders, signatures).callAsync();
            expect(actual).to.deep.eq([constants.ZERO_AMOUNT]);
        });

        it('returns zero for an order with zero taker asset amount', async () => {
            const orders = createOrders(MAKER_TOKEN, TAKER_TOKEN, 1);
            orders[0].takerAssetAmount = constants.ZERO_AMOUNT;
            const signatures: string[] = _.times(orders.length, i => hexUtils.random());
            const actual = await testContract.getOrderFillableMakerAssetAmounts(orders, signatures).callAsync();
            expect(actual).to.deep.eq([constants.ZERO_AMOUNT]);
        });

        it('returns zero for an order with an empty signature', async () => {
            const orders = createOrders(MAKER_TOKEN, TAKER_TOKEN, 1);
            const signatures: string[] = _.times(orders.length, () => constants.NULL_BYTES);
            const actual = await testContract.getOrderFillableMakerAssetAmounts(orders, signatures).callAsync();
            expect(actual).to.deep.eq([constants.ZERO_AMOUNT]);
        });
    });

    blockchainTests.resets('sampleSellsFromKyberNetwork()', () => {
        before(async () => {
            await testContract.createTokenExchanges([MAKER_TOKEN, TAKER_TOKEN]).awaitTransactionSuccessAsync();
        });

        it('throws if tokens are the same', async () => {
            const tx = testContract.sampleSellsFromKyberNetwork(MAKER_TOKEN, MAKER_TOKEN, []).callAsync();
            return expect(tx).to.revertWith(INVALID_TOKEN_PAIR_ERROR);
        });

        it('can return no quotes', async () => {
            const quotes = await testContract.sampleSellsFromKyberNetwork(TAKER_TOKEN, MAKER_TOKEN, []).callAsync();
            expect(quotes).to.deep.eq([]);
        });

        it('can quote token - token', async () => {
            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
            const [expectedQuotes] = getDeterministicSellQuotes(TAKER_TOKEN, MAKER_TOKEN, ['Kyber'], sampleAmounts);
            const quotes = await testContract
                .sampleSellsFromKyberNetwork(TAKER_TOKEN, MAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('returns zero if token -> token fails', async () => {
            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
            await enableFailTriggerAsync();
            const quotes = await testContract
                .sampleSellsFromKyberNetwork(TAKER_TOKEN, MAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('can quote token -> ETH', async () => {
            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
            const [expectedQuotes] = getDeterministicSellQuotes(TAKER_TOKEN, WETH_ADDRESS, ['Kyber'], sampleAmounts);
            const quotes = await testContract
                .sampleSellsFromKyberNetwork(TAKER_TOKEN, WETH_ADDRESS, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('returns zero if token -> ETH fails', async () => {
            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
            await enableFailTriggerAsync();
            const quotes = await testContract
                .sampleSellsFromKyberNetwork(TAKER_TOKEN, WETH_ADDRESS, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('can quote ETH -> token', async () => {
            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
            const [expectedQuotes] = getDeterministicSellQuotes(WETH_ADDRESS, TAKER_TOKEN, ['Kyber'], sampleAmounts);
            const quotes = await testContract
                .sampleSellsFromKyberNetwork(WETH_ADDRESS, TAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('returns zero if ETH -> token fails', async () => {
            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
            await enableFailTriggerAsync();
            const quotes = await testContract
                .sampleSellsFromKyberNetwork(WETH_ADDRESS, TAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });
    });

    blockchainTests.resets('sampleSellsFromEth2Dai()', () => {
        before(async () => {
            await testContract.createTokenExchanges([MAKER_TOKEN, TAKER_TOKEN]).awaitTransactionSuccessAsync();
        });

        it('throws if tokens are the same', async () => {
            const tx = testContract.sampleSellsFromEth2Dai(MAKER_TOKEN, MAKER_TOKEN, []).callAsync();
            return expect(tx).to.revertWith(INVALID_TOKEN_PAIR_ERROR);
        });

        it('can return no quotes', async () => {
            const quotes = await testContract.sampleSellsFromEth2Dai(TAKER_TOKEN, MAKER_TOKEN, []).callAsync();
            expect(quotes).to.deep.eq([]);
        });

        it('can quote token -> token', async () => {
            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
            const [expectedQuotes] = getDeterministicSellQuotes(TAKER_TOKEN, MAKER_TOKEN, ['Eth2Dai'], sampleAmounts);
            const quotes = await testContract
                .sampleSellsFromEth2Dai(TAKER_TOKEN, MAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('returns zero if token -> token fails', async () => {
            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
            await enableFailTriggerAsync();
            const quotes = await testContract
                .sampleSellsFromEth2Dai(TAKER_TOKEN, MAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('can quote token -> ETH', async () => {
            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
            const [expectedQuotes] = getDeterministicSellQuotes(TAKER_TOKEN, WETH_ADDRESS, ['Eth2Dai'], sampleAmounts);
            const quotes = await testContract
                .sampleSellsFromEth2Dai(TAKER_TOKEN, WETH_ADDRESS, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('returns zero if token -> ETH fails', async () => {
            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
            await enableFailTriggerAsync();
            const quotes = await testContract
                .sampleSellsFromEth2Dai(TAKER_TOKEN, WETH_ADDRESS, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('can quote ETH -> token', async () => {
            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
            const [expectedQuotes] = getDeterministicSellQuotes(WETH_ADDRESS, TAKER_TOKEN, ['Eth2Dai'], sampleAmounts);
            const quotes = await testContract
                .sampleSellsFromEth2Dai(WETH_ADDRESS, TAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('returns zero if ETH -> token fails', async () => {
            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
            await enableFailTriggerAsync();
            const quotes = await testContract
                .sampleSellsFromEth2Dai(WETH_ADDRESS, TAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });
    });

    blockchainTests.resets('sampleBuysFromEth2Dai()', () => {
        before(async () => {
            await testContract.createTokenExchanges([MAKER_TOKEN, TAKER_TOKEN]).awaitTransactionSuccessAsync();
        });

        it('throws if tokens are the same', async () => {
            const tx = testContract.sampleBuysFromEth2Dai(MAKER_TOKEN, MAKER_TOKEN, []).callAsync();
            return expect(tx).to.revertWith(INVALID_TOKEN_PAIR_ERROR);
        });

        it('can return no quotes', async () => {
            const quotes = await testContract.sampleBuysFromEth2Dai(TAKER_TOKEN, MAKER_TOKEN, []).callAsync();
            expect(quotes).to.deep.eq([]);
        });

        it('can quote token -> token', async () => {
            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
            const [expectedQuotes] = getDeterministicBuyQuotes(TAKER_TOKEN, MAKER_TOKEN, ['Eth2Dai'], sampleAmounts);
            const quotes = await testContract
                .sampleBuysFromEth2Dai(TAKER_TOKEN, MAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('returns zero if token -> token fails', async () => {
            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
            await enableFailTriggerAsync();
            const quotes = await testContract
                .sampleBuysFromEth2Dai(TAKER_TOKEN, MAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('can quote token -> ETH', async () => {
            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
            const [expectedQuotes] = getDeterministicBuyQuotes(TAKER_TOKEN, WETH_ADDRESS, ['Eth2Dai'], sampleAmounts);
            const quotes = await testContract
                .sampleBuysFromEth2Dai(TAKER_TOKEN, WETH_ADDRESS, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('returns zero if token -> ETH fails', async () => {
            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
            await enableFailTriggerAsync();
            const quotes = await testContract
                .sampleBuysFromEth2Dai(TAKER_TOKEN, WETH_ADDRESS, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('can quote ETH -> token', async () => {
            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
            const [expectedQuotes] = getDeterministicBuyQuotes(WETH_ADDRESS, TAKER_TOKEN, ['Eth2Dai'], sampleAmounts);
            const quotes = await testContract
                .sampleBuysFromEth2Dai(WETH_ADDRESS, TAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('returns zero if ETH -> token fails', async () => {
            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
            await enableFailTriggerAsync();
            const quotes = await testContract
                .sampleBuysFromEth2Dai(WETH_ADDRESS, TAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });
    });

    blockchainTests.resets('sampleSellsFromUniswap()', () => {
        before(async () => {
            await testContract.createTokenExchanges([MAKER_TOKEN, TAKER_TOKEN]).awaitTransactionSuccessAsync();
        });

        it('throws if tokens are the same', async () => {
            const tx = testContract.sampleSellsFromUniswap(MAKER_TOKEN, MAKER_TOKEN, []).callAsync();
            return expect(tx).to.revertWith(INVALID_TOKEN_PAIR_ERROR);
        });

        it('can return no quotes', async () => {
            const quotes = await testContract.sampleSellsFromUniswap(TAKER_TOKEN, MAKER_TOKEN, []).callAsync();
            expect(quotes).to.deep.eq([]);
        });

        it('can quote token -> token', async () => {
            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
            const [expectedQuotes] = getDeterministicSellQuotes(TAKER_TOKEN, MAKER_TOKEN, ['Uniswap'], sampleAmounts);
            const quotes = await testContract
                .sampleSellsFromUniswap(TAKER_TOKEN, MAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('returns zero if token -> token fails', async () => {
            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
            await enableFailTriggerAsync();
            const quotes = await testContract
                .sampleSellsFromUniswap(TAKER_TOKEN, MAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('can quote token -> ETH', async () => {
            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
            const [expectedQuotes] = getDeterministicSellQuotes(TAKER_TOKEN, WETH_ADDRESS, ['Uniswap'], sampleAmounts);
            const quotes = await testContract
                .sampleSellsFromUniswap(TAKER_TOKEN, WETH_ADDRESS, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('returns zero if token -> ETH fails', async () => {
            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
            await enableFailTriggerAsync();
            const quotes = await testContract
                .sampleSellsFromUniswap(TAKER_TOKEN, WETH_ADDRESS, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('can quote ETH -> token', async () => {
            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
            const [expectedQuotes] = getDeterministicSellQuotes(WETH_ADDRESS, TAKER_TOKEN, ['Uniswap'], sampleAmounts);
            const quotes = await testContract
                .sampleSellsFromUniswap(WETH_ADDRESS, TAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('returns zero if ETH -> token fails', async () => {
            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
            await enableFailTriggerAsync();
            const quotes = await testContract
                .sampleSellsFromUniswap(WETH_ADDRESS, TAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('returns zero if no exchange exists for the maker token', async () => {
            const nonExistantToken = randomAddress();
            const sampleAmounts = getSampleAmounts(TAKER_TOKEN);
            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
            const quotes = await testContract
                .sampleSellsFromUniswap(TAKER_TOKEN, nonExistantToken, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('returns zero if no exchange exists for the taker token', async () => {
            const nonExistantToken = randomAddress();
            const sampleAmounts = getSampleAmounts(nonExistantToken);
            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
            const quotes = await testContract
                .sampleSellsFromUniswap(nonExistantToken, MAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });
    });

    blockchainTests.resets('sampleBuysFromUniswap()', () => {
        before(async () => {
            await testContract.createTokenExchanges([MAKER_TOKEN, TAKER_TOKEN]).awaitTransactionSuccessAsync();
        });

        it('throws if tokens are the same', async () => {
            const tx = testContract.sampleBuysFromUniswap(MAKER_TOKEN, MAKER_TOKEN, []).callAsync();
            return expect(tx).to.revertWith(INVALID_TOKEN_PAIR_ERROR);
        });

        it('can return no quotes', async () => {
            const quotes = await testContract.sampleBuysFromUniswap(TAKER_TOKEN, MAKER_TOKEN, []).callAsync();
            expect(quotes).to.deep.eq([]);
        });

        it('can quote token -> token', async () => {
            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
            const [expectedQuotes] = getDeterministicBuyQuotes(TAKER_TOKEN, MAKER_TOKEN, ['Uniswap'], sampleAmounts);
            const quotes = await testContract
                .sampleBuysFromUniswap(TAKER_TOKEN, MAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('returns zero if token -> token fails', async () => {
            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
            await enableFailTriggerAsync();
            const quotes = await testContract
                .sampleBuysFromUniswap(TAKER_TOKEN, MAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('can quote token -> ETH', async () => {
            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
            const [expectedQuotes] = getDeterministicBuyQuotes(TAKER_TOKEN, WETH_ADDRESS, ['Uniswap'], sampleAmounts);
            const quotes = await testContract
                .sampleBuysFromUniswap(TAKER_TOKEN, WETH_ADDRESS, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('returns zero if token -> ETH fails', async () => {
            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
            await enableFailTriggerAsync();
            const quotes = await testContract
                .sampleBuysFromUniswap(TAKER_TOKEN, WETH_ADDRESS, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('can quote ETH -> token', async () => {
            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
            const [expectedQuotes] = getDeterministicBuyQuotes(WETH_ADDRESS, TAKER_TOKEN, ['Uniswap'], sampleAmounts);
            const quotes = await testContract
                .sampleBuysFromUniswap(WETH_ADDRESS, TAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('returns zero if ETH -> token fails', async () => {
            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
            await enableFailTriggerAsync();
            const quotes = await testContract
                .sampleBuysFromUniswap(WETH_ADDRESS, TAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('returns zero if no exchange exists for the maker token', async () => {
            const nonExistantToken = randomAddress();
            const sampleAmounts = getSampleAmounts(nonExistantToken);
            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
            const quotes = await testContract
                .sampleBuysFromUniswap(TAKER_TOKEN, nonExistantToken, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });

        it('returns zero if no exchange exists for the taker token', async () => {
            const nonExistantToken = randomAddress();
            const sampleAmounts = getSampleAmounts(MAKER_TOKEN);
            const expectedQuotes = _.times(sampleAmounts.length, () => constants.ZERO_AMOUNT);
            const quotes = await testContract
                .sampleBuysFromUniswap(nonExistantToken, MAKER_TOKEN, sampleAmounts)
                .callAsync();
            expect(quotes).to.deep.eq(expectedQuotes);
        });
    });

    describe('batchCall()', () => {
        it('can call one function', async () => {
            const orders = createOrders(MAKER_TOKEN, TAKER_TOKEN);
            const signatures: string[] = _.times(orders.length, i => hexUtils.random());
            const expected = orders.map(getDeterministicFillableTakerAssetAmount);
            const calls = [
                testContract.getOrderFillableTakerAssetAmounts(orders, signatures).getABIEncodedTransactionData(),
            ];
            const r = await testContract.batchCall(calls).callAsync();
            expect(r).to.be.length(1);
            const actual = testContract.getABIDecodedReturnData<BigNumber[]>('getOrderFillableTakerAssetAmounts', r[0]);
            expect(actual).to.deep.eq(expected);
        });

        it('can call two functions', async () => {
            const numOrders = _.random(1, 10);
            const orders = _.times(2, () => createOrders(MAKER_TOKEN, TAKER_TOKEN, numOrders));
            const signatures: string[] = _.times(numOrders, i => hexUtils.random());
            const expecteds = [
                orders[0].map(getDeterministicFillableTakerAssetAmount),
                orders[1].map(getDeterministicFillableMakerAssetAmount),
            ];
            const calls = [
                testContract.getOrderFillableTakerAssetAmounts(orders[0], signatures).getABIEncodedTransactionData(),
                testContract.getOrderFillableMakerAssetAmounts(orders[1], signatures).getABIEncodedTransactionData(),
            ];
            const r = await testContract.batchCall(calls).callAsync();
            expect(r).to.be.length(2);
            expect(testContract.getABIDecodedReturnData('getOrderFillableTakerAssetAmounts', r[0])).to.deep.eq(
                expecteds[0],
            );
            expect(testContract.getABIDecodedReturnData('getOrderFillableMakerAssetAmounts', r[1])).to.deep.eq(
                expecteds[1],
            );
        });

        it('can make recursive calls', async () => {
            const numOrders = _.random(1, 10);
            const orders = createOrders(MAKER_TOKEN, TAKER_TOKEN, numOrders);
            const signatures: string[] = _.times(numOrders, i => hexUtils.random());
            const expected = orders.map(getDeterministicFillableTakerAssetAmount);
            let r = await testContract
                .batchCall([
                    testContract
                        .batchCall([
                            testContract
                                .getOrderFillableTakerAssetAmounts(orders, signatures)
                                .getABIEncodedTransactionData(),
                        ])
                        .getABIEncodedTransactionData(),
                ])
                .callAsync();
            expect(r).to.be.length(1);
            r = testContract.getABIDecodedReturnData<string[]>('batchCall', r[0]);
            expect(r).to.be.length(1);
            expect(testContract.getABIDecodedReturnData('getOrderFillableTakerAssetAmounts', r[0])).to.deep.eq(
                expected,
            );
        });
    });
});