import { AssetBuyer, BuyQuote } from '@0x/asset-buyer'; import { AssetProxyId, ObjectMap } from '@0x/types'; import { BigNumber } from '@0x/utils'; import { Web3Wrapper } from '@0x/web3-wrapper'; import * as _ from 'lodash'; import { assetMetaDataMap } from '../data/asset_meta_data_map'; import { Asset, AssetMetaData, AsyncProcessState, DisplayStatus, Network, OrderProcessState, OrderState, } from '../types'; import { assetUtils } from '../util/asset'; import { BigNumberInput } from '../util/big_number_input'; import { Action, ActionTypes } from './actions'; export interface State { network: Network; assetBuyer?: AssetBuyer; assetMetaDataMap: ObjectMap; selectedAsset?: Asset; selectedAssetAmount?: BigNumberInput; buyOrderState: OrderState; ethUsdPrice?: BigNumber; latestBuyQuote?: BuyQuote; quoteRequestState: AsyncProcessState; latestError?: any; latestErrorDisplay: DisplayStatus; } export const INITIAL_STATE: State = { network: Network.Mainnet, selectedAssetAmount: undefined, assetMetaDataMap, buyOrderState: { processState: OrderProcessState.NONE }, ethUsdPrice: undefined, latestBuyQuote: undefined, latestError: undefined, latestErrorDisplay: DisplayStatus.Hidden, quoteRequestState: AsyncProcessState.NONE, }; export const reducer = (state: State = INITIAL_STATE, action: Action): State => { switch (action.type) { case ActionTypes.UPDATE_ETH_USD_PRICE: return { ...state, ethUsdPrice: action.data, }; case ActionTypes.UPDATE_SELECTED_ASSET_AMOUNT: return { ...state, selectedAssetAmount: action.data, }; case ActionTypes.UPDATE_LATEST_BUY_QUOTE: const newBuyQuoteIfExists = action.data; const shouldUpdate = _.isUndefined(newBuyQuoteIfExists) || doesBuyQuoteMatchState(newBuyQuoteIfExists, state); if (shouldUpdate) { return { ...state, latestBuyQuote: newBuyQuoteIfExists, quoteRequestState: AsyncProcessState.SUCCESS, }; } else { return state; } case ActionTypes.SET_QUOTE_REQUEST_STATE_PENDING: return { ...state, latestBuyQuote: undefined, quoteRequestState: AsyncProcessState.PENDING, }; case ActionTypes.SET_QUOTE_REQUEST_STATE_FAILURE: return { ...state, latestBuyQuote: undefined, quoteRequestState: AsyncProcessState.FAILURE, }; case ActionTypes.UPDATE_BUY_ORDER_STATE: return { ...state, buyOrderState: action.data, }; case ActionTypes.SET_ERROR: return { ...state, latestError: action.data, latestErrorDisplay: DisplayStatus.Present, }; case ActionTypes.HIDE_ERROR: return { ...state, latestErrorDisplay: DisplayStatus.Hidden, }; case ActionTypes.CLEAR_ERROR: return { ...state, latestError: undefined, latestErrorDisplay: DisplayStatus.Hidden, }; case ActionTypes.UPDATE_SELECTED_ASSET: const newSelectedAssetData = action.data; let newSelectedAsset: Asset | undefined; if (!_.isUndefined(newSelectedAssetData)) { newSelectedAsset = assetUtils.createAssetFromAssetData( newSelectedAssetData, state.assetMetaDataMap, state.network, ); } return { ...state, selectedAsset: newSelectedAsset, }; case ActionTypes.RESET_AMOUNT: return { ...state, latestBuyQuote: undefined, quoteRequestState: AsyncProcessState.NONE, buyOrderState: { processState: OrderProcessState.NONE }, selectedAssetAmount: undefined, }; default: return state; } }; const doesBuyQuoteMatchState = (buyQuote: BuyQuote, state: State): boolean => { const selectedAssetIfExists = state.selectedAsset; const selectedAssetAmountIfExists = state.selectedAssetAmount; // if no selectedAsset or selectedAssetAmount exists on the current state, return false if (_.isUndefined(selectedAssetIfExists) || _.isUndefined(selectedAssetAmountIfExists)) { return false; } // if buyQuote's assetData does not match that of the current selected asset, return false if (selectedAssetIfExists.assetData !== buyQuote.assetData) { return false; } // if ERC20 and buyQuote's assetBuyAmount does not match selectedAssetAmount, return false // if ERC721, return true const selectedAssetMetaData = selectedAssetIfExists.metaData; if (selectedAssetMetaData.assetProxyId === AssetProxyId.ERC20) { const selectedAssetAmountBaseUnits = Web3Wrapper.toBaseUnitAmount( selectedAssetAmountIfExists, selectedAssetMetaData.decimals, ); const doesAssetAmountMatch = selectedAssetAmountBaseUnits.eq(buyQuote.assetBuyAmount); return doesAssetAmountMatch; } else { return true; } };