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// import { assert } from '@0xproject/assert';
// import { APIOrder, HttpClient, OrderbookResponse } from '@0xproject/connect';
// import { ContractWrappers, OrderAndTraderInfo, OrderStatus } from '@0xproject/contract-wrappers';
// import { schemas } from '@0xproject/json-schemas';
// import { assetDataUtils } from '@0xproject/order-utils';
// import { RemainingFillableCalculator } from '@0xproject/order-utils/lib/src/remaining_fillable_calculator';
// import { RPCSubprovider, Web3ProviderEngine } from '@0xproject/subproviders';
// import { SignedOrder } from '@0xproject/types';
// import { BigNumber } from '@0xproject/utils';
// import * as _ from 'lodash';
// import { constants } from './constants';
// import { ForwarderHelperImpl, ForwarderHelperImplConfig } from '@0xproject/asset-buyer/src/asset_buyer';
// import { ForwarderHelper, ForwarderHelperFactoryError } from './types';
// import { orderUtils } from './utils/order_utils';
// export const forwarderHelperFactory = {
// /**
// * Given an array of orders and an array of feeOrders, get a ForwarderHelper
// * @param orders An array of objects conforming to SignedOrder. Each order should specify the same makerAssetData and takerAssetData
// * @param feeOrders An array of objects conforming to SignedOrder. Each order should specify ZRX as makerAssetData WETH as takerAssetData
// * @return A ForwarderHelper, see type for definition
// */
// getForwarderHelperForOrders(orders: SignedOrder[], feeOrders: SignedOrder[] = []): ForwarderHelper {
// assert.doesConformToSchema('orders', orders, schemas.signedOrdersSchema);
// assert.doesConformToSchema('feeOrders', orders, schemas.signedOrdersSchema);
// // TODO: Add assertion here for orders all having the same makerAsset and takerAsset
// const config: ForwarderHelperImplConfig = {
// orders,
// feeOrders,
// };
// const helper = new ForwarderHelperImpl(config);
// return helper;
// },
// /**
// * Given a desired makerAsset and SRA url, get a ForwarderHelper
// * @param makerAssetData An array of objects conforming to SignedOrder. Each order should specify the same makerAssetData and takerAssetData
// * @param sraUrl A url pointing to an SRA v2 compliant endpoint.
// * @param rpcUrl A url pointing to an ethereum node.
// * @param networkId The ethereum networkId, defaults to 1 (mainnet).
// * @return A ForwarderHelper, see type for definition
// */
// async getForwarderHelperForMakerAssetDataAsync(
// makerAssetData: string,
// sraUrl: string,
// rpcUrl?: string,
// networkId: number = 1,
// ): Promise<ForwarderHelper> {
// assert.isHexString('makerAssetData', makerAssetData);
// assert.isWebUri('sraUrl', sraUrl);
// if (!_.isUndefined(rpcUrl)) {
// assert.isWebUri('rpcUrl', rpcUrl);
// }
// assert.isNumber('networkId', networkId);
// // create provider
// const providerEngine = new Web3ProviderEngine();
// if (!_.isUndefined(rpcUrl)) {
// providerEngine.addProvider(new RPCSubprovider(rpcUrl));
// }
// providerEngine.start();
// // create contract wrappers given provider and networkId
// const contractWrappers = new ContractWrappers(providerEngine, { networkId });
// // find ether token asset data
// const etherTokenAddressIfExists = contractWrappers.etherToken.getContractAddressIfExists();
// if (_.isUndefined(etherTokenAddressIfExists)) {
// throw new Error(ForwarderHelperFactoryError.NoEtherTokenContractFound);
// }
// const etherTokenAssetData = assetDataUtils.encodeERC20AssetData(etherTokenAddressIfExists);
// // find zrx token asset data
// let zrxTokenAssetData: string;
// try {
// zrxTokenAssetData = contractWrappers.exchange.getZRXAssetData();
// } catch (err) {
// throw new Error(ForwarderHelperFactoryError.NoZrxTokenContractFound);
// }
// // get orderbooks for makerAsset/WETH and ZRX/WETH
// const sraClient = new HttpClient(sraUrl);
// const orderbookRequests = [
// { baseAssetData: makerAssetData, quoteAssetData: etherTokenAssetData },
// { baseAssetData: zrxTokenAssetData, quoteAssetData: etherTokenAssetData },
// ];
// const requestOpts = { networkId };
// let makerAssetOrderbook: OrderbookResponse;
// let zrxOrderbook: OrderbookResponse;
// try {
// [makerAssetOrderbook, zrxOrderbook] = await Promise.all(
// _.map(orderbookRequests, request => sraClient.getOrderbookAsync(request, requestOpts)),
// );
// } catch (err) {
// throw new Error(ForwarderHelperFactoryError.StandardRelayerApiError);
// }
// // validate orders and find remaining fillable from on chain state or sra api
// let ordersAndRemainingFillableMakerAssetAmounts: OrdersAndRemainingFillableMakerAssetAmounts;
// let feeOrdersAndRemainingFillableMakerAssetAmounts: OrdersAndRemainingFillableMakerAssetAmounts;
// if (!_.isUndefined(rpcUrl)) {
// // if we do have an rpc url, get on-chain orders and traders info via the OrderValidatorWrapper
// const ordersFromSra = getOpenAsksFromOrderbook(makerAssetOrderbook);
// const feeOrdersFromSra = getOpenAsksFromOrderbook(zrxOrderbook);
// // TODO: try catch these requests and throw a more domain specific error
// // TODO: optimization, reduce this to once RPC call buy combining orders into one array and then splitting up the response
// const [makerAssetOrdersAndTradersInfo, feeOrdersAndTradersInfo] = await Promise.all(
// _.map([ordersFromSra, feeOrdersFromSra], ordersToBeValidated => {
// const takerAddresses = _.map(ordersToBeValidated, () => constants.NULL_ADDRESS);
// return contractWrappers.orderValidator.getOrdersAndTradersInfoAsync(
// ordersToBeValidated,
// takerAddresses,
// );
// }),
// );
// // take maker asset orders from SRA + on chain information and find the valid orders and remaining fillable maker asset amounts
// ordersAndRemainingFillableMakerAssetAmounts = getValidOrdersAndRemainingFillableMakerAssetAmountsFromOnChain(
// ordersFromSra,
// makerAssetOrdersAndTradersInfo,
// zrxTokenAssetData,
// );
// // take fee orders from SRA + on chain information and find the valid orders and remaining fillable maker asset amounts
// feeOrdersAndRemainingFillableMakerAssetAmounts = getValidOrdersAndRemainingFillableMakerAssetAmountsFromOnChain(
// feeOrdersFromSra,
// feeOrdersAndTradersInfo,
// zrxTokenAssetData,
// );
// } else {
// // if we don't have an rpc url, assume all orders are valid and fallback to optional fill amounts from SRA
// // if fill amounts are not available from the SRA, assume all orders are completely fillable
// const apiOrdersFromSra = makerAssetOrderbook.asks.records;
// const feeApiOrdersFromSra = zrxOrderbook.asks.records;
// // take maker asset orders from SRA and the valid orders and remaining fillable maker asset amounts
// ordersAndRemainingFillableMakerAssetAmounts = getValidOrdersAndRemainingFillableMakerAssetAmountsFromApi(
// apiOrdersFromSra,
// );
// // take fee orders from SRA and find the valid orders and remaining fillable maker asset amounts
// feeOrdersAndRemainingFillableMakerAssetAmounts = getValidOrdersAndRemainingFillableMakerAssetAmountsFromApi(
// feeApiOrdersFromSra,
// );
// }
// // compile final config
// const config: ForwarderHelperImplConfig = {
// orders: ordersAndRemainingFillableMakerAssetAmounts.orders,
// feeOrders: feeOrdersAndRemainingFillableMakerAssetAmounts.orders,
// remainingFillableMakerAssetAmounts:
// ordersAndRemainingFillableMakerAssetAmounts.remainingFillableMakerAssetAmounts,
// remainingFillableFeeAmounts:
// feeOrdersAndRemainingFillableMakerAssetAmounts.remainingFillableMakerAssetAmounts,
// };
// const helper = new ForwarderHelperImpl(config);
// return helper;
// },
// };
// interface OrdersAndRemainingFillableMakerAssetAmounts {
// orders: SignedOrder[];
// remainingFillableMakerAssetAmounts: BigNumber[];
// }
// /**
// * Given an array of APIOrder objects from a standard relayer api, return an array
// * of fillable orders with their corresponding remainingFillableMakerAssetAmounts
// */
// function getValidOrdersAndRemainingFillableMakerAssetAmountsFromApi(
// apiOrders: APIOrder[],
// ): OrdersAndRemainingFillableMakerAssetAmounts {
// const result = _.reduce(
// apiOrders,
// (acc, apiOrder) => {
// // get current accumulations
// const { orders, remainingFillableMakerAssetAmounts } = acc;
// // get order and metadata
// const { order, metaData } = apiOrder;
// // if the order is expired or not open, move on
// if (orderUtils.isOrderExpired(order) || !orderUtils.isOpenOrder(order)) {
// return acc;
// }
// // calculate remainingFillableMakerAssetAmount from api metadata, else assume order is completely fillable
// const remainingFillableTakerAssetAmount = _.get(
// metaData,
// 'remainingTakerAssetAmount',
// order.takerAssetAmount,
// );
// const remainingFillableMakerAssetAmount = orderUtils.calculateRemainingMakerAssetAmount(
// order,
// remainingFillableTakerAssetAmount,
// );
// // if there is some amount of maker asset left to fill and add the order and remaining amount to the accumulations
// // if there is not any maker asset left to fill, do not add
// if (remainingFillableMakerAssetAmount.gt(constants.ZERO_AMOUNT)) {
// return {
// orders: _.concat(orders, order),
// remainingFillableMakerAssetAmounts: _.concat(
// remainingFillableMakerAssetAmounts,
// remainingFillableMakerAssetAmount,
// ),
// };
// } else {
// return acc;
// }
// },
// { orders: [] as SignedOrder[], remainingFillableMakerAssetAmounts: [] as BigNumber[] },
// );
// return result;
// }
// /**
// * Given an array of orders and corresponding on-chain infos, return a subset of the orders
// * that are still fillable orders with their corresponding remainingFillableMakerAssetAmounts
// */
// function getValidOrdersAndRemainingFillableMakerAssetAmountsFromOnChain(
// inputOrders: SignedOrder[],
// ordersAndTradersInfo: OrderAndTraderInfo[],
// zrxAssetData: string,
// ): OrdersAndRemainingFillableMakerAssetAmounts {
// // iterate through the input orders and find the ones that are still fillable
// // for the orders that are still fillable, calculate the remaining fillable maker asset amount
// const result = _.reduce(
// inputOrders,
// (acc, order, index) => {
// // get current accumulations
// const { orders, remainingFillableMakerAssetAmounts } = acc;
// // get corresponding on-chain state for the order
// const { orderInfo, traderInfo } = ordersAndTradersInfo[index];
// // if the order IS NOT fillable, do not add anything to the accumulations and continue iterating
// if (orderInfo.orderStatus !== OrderStatus.FILLABLE) {
// return acc;
// }
// // if the order IS fillable, add the order and calculate the remaining fillable amount
// const transferrableAssetAmount = BigNumber.min([traderInfo.makerAllowance, traderInfo.makerBalance]);
// const transferrableFeeAssetAmount = BigNumber.min([
// traderInfo.makerZrxAllowance,
// traderInfo.makerZrxBalance,
// ]);
// const remainingTakerAssetAmount = order.takerAssetAmount.minus(orderInfo.orderTakerAssetFilledAmount);
// const remainingMakerAssetAmount = orderUtils.calculateRemainingMakerAssetAmount(
// order,
// remainingTakerAssetAmount,
// );
// const remainingFillableCalculator = new RemainingFillableCalculator(
// order.makerFee,
// order.makerAssetAmount,
// order.makerAssetData === zrxAssetData,
// transferrableAssetAmount,
// transferrableFeeAssetAmount,
// remainingMakerAssetAmount,
// );
// const remainingFillableAmount = remainingFillableCalculator.computeRemainingFillable();
// return {
// orders: _.concat(orders, order),
// remainingFillableMakerAssetAmounts: _.concat(
// remainingFillableMakerAssetAmounts,
// remainingFillableAmount,
// ),
// };
// },
// { orders: [] as SignedOrder[], remainingFillableMakerAssetAmounts: [] as BigNumber[] },
// );
// return result;
// }
// function getOpenAsksFromOrderbook(orderbookResponse: OrderbookResponse): SignedOrder[] {
// const asks = _.map(orderbookResponse.asks.records, apiOrder => apiOrder.order);
// const result = _.filter(asks, ask => orderUtils.isOpenOrder(ask));
// return result;
// }
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