import { 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 { LOADING_ACCOUNT, LOCKED_ACCOUNT } from '../constants'; import { assetMetaDataMap } from '../data/asset_meta_data_map'; import { Account, AccountReady, AccountState, AffiliateInfo, Asset, AssetMetaData, AsyncProcessState, DisplayStatus, Network, OrderProcessState, OrderState, ProviderState, } from '../types'; import { Action, ActionTypes } from './actions'; // State that is required and we have defaults for, before props are passed in export interface DefaultState { network: Network; assetMetaDataMap: ObjectMap; buyOrderState: OrderState; latestErrorDisplayStatus: DisplayStatus; quoteRequestState: AsyncProcessState; } // State that is required but needs to be derived from the props interface PropsDerivedState { providerState: ProviderState; } // State that is optional interface OptionalState { selectedAsset: Asset; availableAssets: Asset[]; selectedAssetAmount: BigNumber; ethUsdPrice: BigNumber; latestBuyQuote: BuyQuote; latestErrorMessage: string; affiliateInfo: AffiliateInfo; } export type State = DefaultState & PropsDerivedState & Partial; export const DEFAULT_STATE: DefaultState = { network: Network.Mainnet, assetMetaDataMap, buyOrderState: { processState: OrderProcessState.None }, latestErrorDisplayStatus: DisplayStatus.Hidden, quoteRequestState: AsyncProcessState.None, }; export const createReducer = (initialState: State) => { const reducer = (state: State = initialState, action: Action): State => { switch (action.type) { case ActionTypes.SET_ACCOUNT_STATE_LOADING: return reduceStateWithAccount(state, LOADING_ACCOUNT); case ActionTypes.SET_ACCOUNT_STATE_LOCKED: return reduceStateWithAccount(state, LOCKED_ACCOUNT); case ActionTypes.SET_ACCOUNT_STATE_READY: { const account: AccountReady = { state: AccountState.Ready, address: action.data, }; return reduceStateWithAccount(state, account); } case ActionTypes.UPDATE_ACCOUNT_ETH_BALANCE: { const { address, ethBalanceInWei } = action.data; const currentAccount = state.providerState.account; if (currentAccount.state !== AccountState.Ready || currentAccount.address !== address) { return state; } else { const newAccount: AccountReady = { ...currentAccount, ethBalanceInWei, }; return reduceStateWithAccount(state, newAccount); } } 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.SET_BUY_ORDER_STATE_NONE: return { ...state, buyOrderState: { processState: OrderProcessState.None }, }; case ActionTypes.SET_BUY_ORDER_STATE_VALIDATING: return { ...state, buyOrderState: { processState: OrderProcessState.Validating }, }; case ActionTypes.SET_BUY_ORDER_STATE_PROCESSING: const processingData = action.data; const { startTimeUnix, expectedEndTimeUnix } = processingData; return { ...state, buyOrderState: { processState: OrderProcessState.Processing, txHash: processingData.txHash, progress: { startTimeUnix, expectedEndTimeUnix, }, }, }; case ActionTypes.SET_BUY_ORDER_STATE_FAILURE: const failureTxHash = action.data; if ('txHash' in state.buyOrderState) { if (state.buyOrderState.txHash === failureTxHash) { const { txHash, progress } = state.buyOrderState; return { ...state, buyOrderState: { processState: OrderProcessState.Failure, txHash, progress, }, }; } } return state; case ActionTypes.SET_BUY_ORDER_STATE_SUCCESS: const successTxHash = action.data; if ('txHash' in state.buyOrderState) { if (state.buyOrderState.txHash === successTxHash) { const { txHash, progress } = state.buyOrderState; return { ...state, buyOrderState: { processState: OrderProcessState.Success, txHash, progress, }, }; } } return state; case ActionTypes.SET_ERROR_MESSAGE: return { ...state, latestErrorMessage: action.data, latestErrorDisplayStatus: DisplayStatus.Present, }; case ActionTypes.HIDE_ERROR: return { ...state, latestErrorDisplayStatus: DisplayStatus.Hidden, }; case ActionTypes.CLEAR_ERROR: return { ...state, latestErrorMessage: undefined, latestErrorDisplayStatus: DisplayStatus.Hidden, }; case ActionTypes.UPDATE_SELECTED_ASSET: return { ...state, selectedAsset: action.data, }; case ActionTypes.RESET_AMOUNT: return { ...state, latestBuyQuote: undefined, quoteRequestState: AsyncProcessState.None, buyOrderState: { processState: OrderProcessState.None }, selectedAssetAmount: undefined, }; case ActionTypes.SET_AVAILABLE_ASSETS: return { ...state, availableAssets: action.data, }; default: return state; } }; return reducer; }; const reduceStateWithAccount = (state: State, account: Account) => { const oldProviderState = state.providerState; const newProviderState: ProviderState = { ...oldProviderState, account, }; return { ...state, providerState: newProviderState, }; }; 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; } };