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path: root/packages/instant/src/util/buy_quote_fetcher.ts
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// TODO: rename file and export object
import { AssetBuyer, AssetBuyerError, BuyQuote } from '@0x/asset-buyer';
import { BigNumber } from '@0x/utils';
import { Web3Wrapper } from '@0x/web3-wrapper';
import * as _ from 'lodash';
import { Dispatch } from 'redux';
import { oc } from 'ts-optchain';

import { Action, actions } from '../redux/actions';
import { AffiliateInfo, ERC20Asset } from '../types';
import { assetUtils } from '../util/asset';

import { errorFlasher } from './error_flasher';

export const updateBuyQuoteOrFlashErrorAsync = async (
    assetBuyer: AssetBuyer,
    asset: ERC20Asset,
    assetAmount: BigNumber,
    dispatch: Dispatch<Action>,
    affiliateInfo?: AffiliateInfo,
) => {
    // get a new buy quote.
    const baseUnitValue = Web3Wrapper.toBaseUnitAmount(assetAmount, asset.metaData.decimals);

    const feePercentage = oc(affiliateInfo).feePercentage();
    let newBuyQuote: BuyQuote | undefined;
    try {
        newBuyQuote = await assetBuyer.getBuyQuoteAsync(asset.assetData, baseUnitValue, { feePercentage });
    } catch (error) {
        dispatch(actions.setQuoteRequestStateFailure());
        let errorMessage;
        if (error.message === AssetBuyerError.InsufficientAssetLiquidity) {
            const assetName = assetUtils.bestNameForAsset(asset, 'of this asset');
            errorMessage = `Not enough ${assetName} available`;
        } else if (error.message === AssetBuyerError.InsufficientZrxLiquidity) {
            errorMessage = 'Not enough ZRX available';
        } else if (
            error.message === AssetBuyerError.StandardRelayerApiError ||
            error.message.startsWith(AssetBuyerError.AssetUnavailable)
        ) {
            const assetName = assetUtils.bestNameForAsset(asset, 'This asset');
            errorMessage = `${assetName} is currently unavailable`;
        }
        if (!_.isUndefined(errorMessage)) {
            errorFlasher.flashNewErrorMessage(dispatch, errorMessage);
        } else {
            throw error;
        }
        return;
    }
    // We have a successful new buy quote
    errorFlasher.clearError(dispatch);
    // invalidate the last buy quote.
    dispatch(actions.updateLatestBuyQuote(newBuyQuote));
};