metamask-extension/ui/app/pages/swaps/view-quote/view-quote.js

import React, { useState, useContext, useMemo, useEffect, useRef } from 'react';
import { useSelector, useDispatch } from 'react-redux';
import { useHistory } from 'react-router-dom';
import BigNumber from 'bignumber.js';
import { isEqual } from 'lodash';
import classnames from 'classnames';
import { I18nContext } from '../../../contexts/i18n';
import SelectQuotePopover from '../select-quote-popover';
import { useEthFiatAmount } from '../../../hooks/useEthFiatAmount';
import { useEqualityCheck } from '../../../hooks/useEqualityCheck';
import { useNewMetricEvent } from '../../../hooks/useMetricEvent';
import { usePrevious } from '../../../hooks/usePrevious';
import { MetaMetricsContext } from '../../../contexts/metametrics.new';
import FeeCard from '../fee-card';
import {
  FALLBACK_GAS_MULTIPLIER,
  getQuotes,
  getSelectedQuote,
  getApproveTxParams,
  getFetchParams,
  setBalanceError,
  getQuotesLastFetched,
  getBalanceError,
  getCustomSwapsGas,
  getDestinationTokenInfo,
  getUsedSwapsGasPrice,
  getTopQuote,
  navigateBackToBuildQuote,
  signAndSendTransactions,
  getBackgroundSwapRouteState,
  swapsQuoteSelected,
  getSwapsQuoteRefreshTime,
} from '../../../ducks/swaps/swaps';
import {
  conversionRateSelector,
  getSelectedAccount,
  getCurrentCurrency,
  getTokenExchangeRates,
  getSwapsEthToken,
} from '../../../selectors';
import { toPrecisionWithoutTrailingZeros } from '../../../helpers/utils/util';
import { getTokens } from '../../../ducks/metamask/metamask';
import {
  safeRefetchQuotes,
  setCustomApproveTxData,
  setSwapsErrorKey,
  showModal,
} from '../../../store/actions';
import {
  ASSET_ROUTE,
  BUILD_QUOTE_ROUTE,
  DEFAULT_ROUTE,
  SWAPS_ERROR_ROUTE,
  AWAITING_SWAP_ROUTE,
} from '../../../helpers/constants/routes';
import { getTokenData } from '../../../helpers/utils/transactions.util';
import {
  calcTokenAmount,
  calcTokenValue,
  getTokenValueParam,
} from '../../../helpers/utils/token-util';
import {
  decimalToHex,
  hexToDecimal,
  getValueFromWeiHex,
} from '../../../helpers/utils/conversions.util';
import MainQuoteSummary from '../main-quote-summary';
import { calcGasTotal } from '../../send/send.utils';
import { getCustomTxParamsData } from '../../confirm-approve/confirm-approve.util';
import ActionableMessage from '../actionable-message';
import {
  quotesToRenderableData,
  getRenderableNetworkFeesForQuote,
} from '../swaps.util';
import { useTokenTracker } from '../../../hooks/useTokenTracker';
import { QUOTES_EXPIRED_ERROR } from '../../../helpers/constants/swaps';
import CountdownTimer from '../countdown-timer';
import SwapsFooter from '../swaps-footer';
import ViewQuotePriceDifference from './view-quote-price-difference';

export default function ViewQuote() {
  const history = useHistory();
  const dispatch = useDispatch();
  const t = useContext(I18nContext);
  const metaMetricsEvent = useContext(MetaMetricsContext);

  const [dispatchedSafeRefetch, setDispatchedSafeRefetch] = useState(false);
  const [submitClicked, setSubmitClicked] = useState(false);
  const [selectQuotePopoverShown, setSelectQuotePopoverShown] = useState(false);
  const [warningHidden, setWarningHidden] = useState(false);
  const [originalApproveAmount, setOriginalApproveAmount] = useState(null);

  const [
    acknowledgedPriceDifference,
    setAcknowledgedPriceDifference,
  ] = useState(false);
  const priceDifferenceRiskyBuckets = ['high', 'medium'];

  const routeState = useSelector(getBackgroundSwapRouteState);
  const quotes = useSelector(getQuotes, isEqual);
  useEffect(() => {
    if (!Object.values(quotes).length) {
      history.push(BUILD_QUOTE_ROUTE);
    } else if (routeState === 'awaiting') {
      history.push(AWAITING_SWAP_ROUTE);
    }
  }, [history, quotes, routeState]);

  const quotesLastFetched = useSelector(getQuotesLastFetched);

  // Select necessary data
  const gasPrice = useSelector(getUsedSwapsGasPrice);
  const customMaxGas = useSelector(getCustomSwapsGas);
  const tokenConversionRates = useSelector(getTokenExchangeRates);
  const memoizedTokenConversionRates = useEqualityCheck(tokenConversionRates);
  const { balance: ethBalance } = useSelector(getSelectedAccount);
  const conversionRate = useSelector(conversionRateSelector);
  const currentCurrency = useSelector(getCurrentCurrency);
  const swapsTokens = useSelector(getTokens);
  const balanceError = useSelector(getBalanceError);
  const fetchParams = useSelector(getFetchParams);
  const approveTxParams = useSelector(getApproveTxParams);
  const selectedQuote = useSelector(getSelectedQuote);
  const topQuote = useSelector(getTopQuote);
  const usedQuote = selectedQuote || topQuote;
  const tradeValue = usedQuote?.trade?.value ?? '0x0';
  const swapsQuoteRefreshTime = useSelector(getSwapsQuoteRefreshTime);
  const swapsEthToken = useSelector(getSwapsEthToken);

  const { isBestQuote } = usedQuote;

  const fetchParamsSourceToken = fetchParams?.sourceToken;

  const usedGasLimit =
    usedQuote?.gasEstimateWithRefund ||
    `0x${decimalToHex(usedQuote?.averageGas || 0)}`;

  const gasLimitForMax = usedQuote?.gasEstimate || `0x0`;

  const usedGasLimitWithMultiplier = new BigNumber(gasLimitForMax, 16)
    .times(usedQuote?.gasMultiplier || FALLBACK_GAS_MULTIPLIER, 10)
    .round(0)
    .toString(16);

  const nonCustomMaxGasLimit = usedQuote?.gasEstimate
    ? usedGasLimitWithMultiplier
    : `0x${decimalToHex(usedQuote?.maxGas || 0)}`;
  const maxGasLimit = customMaxGas || nonCustomMaxGasLimit;

  const gasTotalInWeiHex = calcGasTotal(maxGasLimit, gasPrice);

  const { tokensWithBalances } = useTokenTracker(swapsTokens, true);
  const balanceToken =
    fetchParamsSourceToken === swapsEthToken.address
      ? swapsEthToken
      : tokensWithBalances.find(
          ({ address }) => address === fetchParamsSourceToken,
        );

  const selectedFromToken = balanceToken || usedQuote.sourceTokenInfo;
  const tokenBalance =
    tokensWithBalances?.length &&
    calcTokenAmount(
      selectedFromToken.balance || '0x0',
      selectedFromToken.decimals,
    ).toFixed(9);
  const tokenBalanceUnavailable =
    tokensWithBalances && balanceToken === undefined;

  const approveData = getTokenData(approveTxParams?.data);
  const approveValue = approveData && getTokenValueParam(approveData);
  const approveAmount =
    approveValue &&
    selectedFromToken?.decimals !== undefined &&
    calcTokenAmount(approveValue, selectedFromToken.decimals).toFixed(9);
  const approveGas = approveTxParams?.gas;

  const renderablePopoverData = useMemo(() => {
    return quotesToRenderableData(
      quotes,
      gasPrice,
      conversionRate,
      currentCurrency,
      approveGas,
      memoizedTokenConversionRates,
    );
  }, [
    quotes,
    gasPrice,
    conversionRate,
    currentCurrency,
    approveGas,
    memoizedTokenConversionRates,
  ]);

  const renderableDataForUsedQuote = renderablePopoverData.find(
    (renderablePopoverDatum) =>
      renderablePopoverDatum.aggId === usedQuote.aggregator,
  );

  const {
    destinationTokenDecimals,
    destinationTokenSymbol,
    destinationTokenValue,
    destinationIconUrl,
    sourceTokenDecimals,
    sourceTokenSymbol,
    sourceTokenValue,
    sourceTokenIconUrl,
  } = renderableDataForUsedQuote;

  const { feeInFiat, feeInEth } = getRenderableNetworkFeesForQuote(
    usedGasLimit,
    approveGas,
    gasPrice,
    currentCurrency,
    conversionRate,
    tradeValue,
    sourceTokenSymbol,
    usedQuote.sourceAmount,
  );

  const {
    feeInFiat: maxFeeInFiat,
    feeInEth: maxFeeInEth,
    nonGasFee,
  } = getRenderableNetworkFeesForQuote(
    maxGasLimit,
    approveGas,
    gasPrice,
    currentCurrency,
    conversionRate,
    tradeValue,
    sourceTokenSymbol,
    usedQuote.sourceAmount,
  );

  const tokenCost = new BigNumber(usedQuote.sourceAmount);
  const ethCost = new BigNumber(usedQuote.trade.value || 0, 10).plus(
    new BigNumber(gasTotalInWeiHex, 16),
  );

  const insufficientTokens =
    (tokensWithBalances?.length || balanceError) &&
    tokenCost.gt(new BigNumber(selectedFromToken.balance || '0x0'));

  const insufficientEth = ethCost.gt(new BigNumber(ethBalance || '0x0'));

  const tokenBalanceNeeded = insufficientTokens
    ? toPrecisionWithoutTrailingZeros(
        calcTokenAmount(tokenCost, selectedFromToken.decimals)
          .minus(tokenBalance)
          .toString(10),
        6,
      )
    : null;

  const ethBalanceNeeded = insufficientEth
    ? toPrecisionWithoutTrailingZeros(
        ethCost
          .minus(ethBalance, 16)
          .div('1000000000000000000', 10)
          .toString(10),
        6,
      )
    : null;

  const destinationToken = useSelector(getDestinationTokenInfo);

  useEffect(() => {
    if (insufficientTokens || insufficientEth) {
      dispatch(setBalanceError(true));
    } else if (balanceError && !insufficientTokens && !insufficientEth) {
      dispatch(setBalanceError(false));
    }
  }, [insufficientTokens, insufficientEth, balanceError, dispatch]);

  useEffect(() => {
    const currentTime = Date.now();
    const timeSinceLastFetched = currentTime - quotesLastFetched;
    if (
      timeSinceLastFetched > swapsQuoteRefreshTime &&
      !dispatchedSafeRefetch
    ) {
      setDispatchedSafeRefetch(true);
      dispatch(safeRefetchQuotes());
    } else if (timeSinceLastFetched > swapsQuoteRefreshTime) {
      dispatch(setSwapsErrorKey(QUOTES_EXPIRED_ERROR));
      history.push(SWAPS_ERROR_ROUTE);
    }
  }, [
    quotesLastFetched,
    dispatchedSafeRefetch,
    dispatch,
    history,
    swapsQuoteRefreshTime,
  ]);

  useEffect(() => {
    if (!originalApproveAmount && approveAmount) {
      setOriginalApproveAmount(approveAmount);
    }
  }, [originalApproveAmount, approveAmount]);

  const showInsufficientWarning =
    (balanceError || tokenBalanceNeeded || ethBalanceNeeded) && !warningHidden;

  const numberOfQuotes = Object.values(quotes).length;
  const bestQuoteReviewedEventSent = useRef();
  const eventObjectBase = {
    token_from: sourceTokenSymbol,
    token_from_amount: sourceTokenValue,
    token_to: destinationTokenSymbol,
    token_to_amount: destinationTokenValue,
    request_type: fetchParams?.balanceError,
    slippage: fetchParams?.slippage,
    custom_slippage: fetchParams?.slippage !== 2,
    response_time: fetchParams?.responseTime,
    best_quote_source: topQuote?.aggregator,
    available_quotes: numberOfQuotes,
  };

  const allAvailableQuotesOpened = useNewMetricEvent({
    event: 'All Available Quotes Opened',
    category: 'swaps',
    sensitiveProperties: {
      ...eventObjectBase,
      other_quote_selected: usedQuote?.aggregator !== topQuote?.aggregator,
      other_quote_selected_source:
        usedQuote?.aggregator === topQuote?.aggregator
          ? null
          : usedQuote?.aggregator,
    },
  });
  const quoteDetailsOpened = useNewMetricEvent({
    event: 'Quote Details Opened',
    category: 'swaps',
    sensitiveProperties: {
      ...eventObjectBase,
      other_quote_selected: usedQuote?.aggregator !== topQuote?.aggregator,
      other_quote_selected_source:
        usedQuote?.aggregator === topQuote?.aggregator
          ? null
          : usedQuote?.aggregator,
    },
  });
  const editSpendLimitOpened = useNewMetricEvent({
    event: 'Edit Spend Limit Opened',
    category: 'swaps',
    sensitiveProperties: {
      ...eventObjectBase,
      custom_spend_limit_set: originalApproveAmount === approveAmount,
      custom_spend_limit_amount:
        originalApproveAmount === approveAmount ? null : approveAmount,
    },
  });

  const bestQuoteReviewedEvent = useNewMetricEvent({
    event: 'Best Quote Reviewed',
    category: 'swaps',
    sensitiveProperties: { ...eventObjectBase, network_fees: feeInFiat },
  });
  useEffect(() => {
    if (
      !bestQuoteReviewedEventSent.current &&
      [
        sourceTokenSymbol,
        sourceTokenValue,
        destinationTokenSymbol,
        destinationTokenValue,
        fetchParams,
        topQuote,
        numberOfQuotes,
        feeInFiat,
      ].every((dep) => dep !== null && dep !== undefined)
    ) {
      bestQuoteReviewedEventSent.current = true;
      bestQuoteReviewedEvent();
    }
  }, [
    sourceTokenSymbol,
    sourceTokenValue,
    destinationTokenSymbol,
    destinationTokenValue,
    fetchParams,
    topQuote,
    numberOfQuotes,
    feeInFiat,
    bestQuoteReviewedEvent,
  ]);

  const metaMaskFee = usedQuote.fee;

  const onFeeCardTokenApprovalClick = () => {
    editSpendLimitOpened();
    dispatch(
      showModal({
        name: 'EDIT_APPROVAL_PERMISSION',
        decimals: selectedFromToken.decimals,
        origin: 'MetaMask',
        setCustomAmount: (newCustomPermissionAmount) => {
          const customPermissionAmount =
            newCustomPermissionAmount === ''
              ? originalApproveAmount
              : newCustomPermissionAmount;
          const newData = getCustomTxParamsData(approveTxParams.data, {
            customPermissionAmount,
            decimals: selectedFromToken.decimals,
          });

          if (
            customPermissionAmount?.length &&
            approveTxParams.data !== newData
          ) {
            dispatch(setCustomApproveTxData(newData));
          }
        },
        tokenAmount: originalApproveAmount,
        customTokenAmount:
          originalApproveAmount === approveAmount ? null : approveAmount,
        tokenBalance,
        tokenSymbol: selectedFromToken.symbol,
        requiredMinimum: calcTokenAmount(
          usedQuote.sourceAmount,
          selectedFromToken.decimals,
        ),
      }),
    );
  };

  const nonGasFeeIsPositive = new BigNumber(nonGasFee, 16).gt(0);
  const approveGasTotal = calcGasTotal(approveGas || '0x0', gasPrice);
  const extraNetworkFeeTotalInHexWEI = new BigNumber(nonGasFee, 16)
    .plus(approveGasTotal, 16)
    .toString(16);
  const extraNetworkFeeTotalInEth = getValueFromWeiHex({
    value: extraNetworkFeeTotalInHexWEI,
    toDenomination: 'ETH',
    numberOfDecimals: 4,
  });

  let extraInfoRowLabel = '';
  if (approveGas && nonGasFeeIsPositive) {
    extraInfoRowLabel = t('approvalAndAggregatorTxFeeCost');
  } else if (approveGas) {
    extraInfoRowLabel = t('approvalTxGasCost');
  } else if (nonGasFeeIsPositive) {
    extraInfoRowLabel = t('aggregatorFeeCost');
  }

  const onFeeCardMaxRowClick = () =>
    dispatch(
      showModal({
        name: 'CUSTOMIZE_METASWAP_GAS',
        value: tradeValue,
        customGasLimitMessage: approveGas
          ? t('extraApprovalGas', [hexToDecimal(approveGas)])
          : '',
        customTotalSupplement: approveGasTotal,
        extraInfoRow: extraInfoRowLabel
          ? {
              label: extraInfoRowLabel,
              value: t('amountInEth', [extraNetworkFeeTotalInEth]),
            }
          : null,
        initialGasPrice: gasPrice,
        initialGasLimit: maxGasLimit,
        minimumGasLimit: new BigNumber(nonCustomMaxGasLimit, 16).toNumber(),
      }),
    );

  const tokenApprovalTextComponent = (
    <span key="swaps-view-quote-approve-symbol-1" className="view-quote__bold">
      {sourceTokenSymbol}
    </span>
  );

  const actionableBalanceErrorMessage = tokenBalanceUnavailable
    ? t('swapTokenBalanceUnavailable', [sourceTokenSymbol])
    : t('swapApproveNeedMoreTokens', [
        <span key="swapApproveNeedMoreTokens-1" className="view-quote__bold">
          {tokenBalanceNeeded || ethBalanceNeeded}
        </span>,
        tokenBalanceNeeded && !(sourceTokenSymbol === 'ETH')
          ? sourceTokenSymbol
          : 'ETH',
      ]);

  // Price difference warning
  const priceSlippageBucket = usedQuote?.priceSlippage?.bucket;
  const lastPriceDifferenceBucket = usePrevious(priceSlippageBucket);

  // If the user agreed to a different bucket of risk, make them agree again
  useEffect(() => {
    if (
      acknowledgedPriceDifference &&
      lastPriceDifferenceBucket === 'medium' &&
      priceSlippageBucket === 'high'
    ) {
      setAcknowledgedPriceDifference(false);
    }
  }, [
    priceSlippageBucket,
    acknowledgedPriceDifference,
    lastPriceDifferenceBucket,
  ]);

  let viewQuotePriceDifferenceComponent = null;
  const priceSlippageFromSource = useEthFiatAmount(
    usedQuote?.priceSlippage?.sourceAmountInETH || 0,
  );
  const priceSlippageFromDestination = useEthFiatAmount(
    usedQuote?.priceSlippage?.destinationAmountInETH || 0,
  );

  // We cannot present fiat value if there is a calculation error or no slippage
  // from source or destination
  const priceSlippageUnknownFiatValue =
    !priceSlippageFromSource ||
    !priceSlippageFromDestination ||
    usedQuote?.priceSlippage?.calculationError;

  let priceDifferencePercentage = 0;
  if (usedQuote?.priceSlippage?.ratio) {
    priceDifferencePercentage = parseFloat(
      new BigNumber(usedQuote.priceSlippage.ratio, 10)
        .minus(1, 10)
        .times(100, 10)
        .toFixed(2),
      10,
    );
  }

  const shouldShowPriceDifferenceWarning =
    !tokenBalanceUnavailable &&
    !showInsufficientWarning &&
    usedQuote &&
    (priceDifferenceRiskyBuckets.includes(priceSlippageBucket) ||
      priceSlippageUnknownFiatValue);

  if (shouldShowPriceDifferenceWarning) {
    viewQuotePriceDifferenceComponent = (
      <ViewQuotePriceDifference
        usedQuote={usedQuote}
        sourceTokenValue={sourceTokenValue}
        destinationTokenValue={destinationTokenValue}
        priceSlippageFromSource={priceSlippageFromSource}
        priceSlippageFromDestination={priceSlippageFromDestination}
        priceDifferencePercentage={priceDifferencePercentage}
        priceSlippageUnknownFiatValue={priceSlippageUnknownFiatValue}
        onAcknowledgementClick={() => {
          setAcknowledgedPriceDifference(true);
        }}
        acknowledged={acknowledgedPriceDifference}
      />
    );
  }

  const disableSubmissionDueToPriceWarning =
    shouldShowPriceDifferenceWarning && !acknowledgedPriceDifference;

  const isShowingWarning =
    showInsufficientWarning || shouldShowPriceDifferenceWarning;

  return (
    <div className="view-quote">
      <div
        className={classnames('view-quote__content', {
          'view-quote__content_modal': disableSubmissionDueToPriceWarning,
        })}
      >
        {selectQuotePopoverShown && (
          <SelectQuotePopover
            quoteDataRows={renderablePopoverData}
            onClose={() => setSelectQuotePopoverShown(false)}
            onSubmit={(aggId) => dispatch(swapsQuoteSelected(aggId))}
            swapToSymbol={destinationTokenSymbol}
            initialAggId={usedQuote.aggregator}
            onQuoteDetailsIsOpened={quoteDetailsOpened}
          />
        )}
        <div
          className={classnames('view-quote__warning-wrapper', {
            'view-quote__warning-wrapper--thin': !isShowingWarning,
          })}
        >
          {viewQuotePriceDifferenceComponent}
          {(showInsufficientWarning || tokenBalanceUnavailable) && (
            <ActionableMessage
              message={actionableBalanceErrorMessage}
              onClose={() => setWarningHidden(true)}
            />
          )}
        </div>
        <div className="view-quote__countdown-timer-container">
          <CountdownTimer
            timeStarted={quotesLastFetched}
            warningTime="0:30"
            infoTooltipLabelKey="swapQuotesAreRefreshed"
            labelKey="swapNewQuoteIn"
          />
        </div>
        <MainQuoteSummary
          sourceValue={calcTokenValue(sourceTokenValue, sourceTokenDecimals)}
          sourceDecimals={sourceTokenDecimals}
          sourceSymbol={sourceTokenSymbol}
          destinationValue={calcTokenValue(
            destinationTokenValue,
            destinationTokenDecimals,
          )}
          destinationDecimals={destinationTokenDecimals}
          destinationSymbol={destinationTokenSymbol}
          sourceIconUrl={sourceTokenIconUrl}
          destinationIconUrl={destinationIconUrl}
        />
        <div
          className={classnames('view-quote__fee-card-container', {
            'view-quote__fee-card-container--three-rows':
              approveTxParams && (!balanceError || warningHidden),
          })}
        >
          <FeeCard
            primaryFee={{
              fee: feeInEth,
              maxFee: maxFeeInEth,
            }}
            secondaryFee={{
              fee: feeInFiat,
              maxFee: maxFeeInFiat,
            }}
            onFeeCardMaxRowClick={onFeeCardMaxRowClick}
            hideTokenApprovalRow={
              !approveTxParams || (balanceError && !warningHidden)
            }
            tokenApprovalTextComponent={tokenApprovalTextComponent}
            tokenApprovalSourceTokenSymbol={sourceTokenSymbol}
            onTokenApprovalClick={onFeeCardTokenApprovalClick}
            metaMaskFee={String(metaMaskFee)}
            isBestQuote={isBestQuote}
            numberOfQuotes={Object.values(quotes).length}
            onQuotesClick={() => {
              allAvailableQuotesOpened();
              setSelectQuotePopoverShown(true);
            }}
            tokenConversionRate={
              destinationTokenSymbol === 'ETH'
                ? 1
                : memoizedTokenConversionRates[destinationToken.address]
            }
          />
        </div>
      </div>
      <SwapsFooter
        onSubmit={() => {
          setSubmitClicked(true);
          if (!balanceError) {
            dispatch(signAndSendTransactions(history, metaMetricsEvent));
          } else if (destinationToken.symbol === 'ETH') {
            history.push(DEFAULT_ROUTE);
          } else {
            history.push(`${ASSET_ROUTE}/${destinationToken.address}`);
          }
        }}
        submitText={t('swap')}
        onCancel={async () => await dispatch(navigateBackToBuildQuote(history))}
        disabled={
          submitClicked ||
          balanceError ||
          tokenBalanceUnavailable ||
          disableSubmissionDueToPriceWarning ||
          gasPrice === null ||
          gasPrice === undefined
        }
        className={isShowingWarning && 'view-quote__thin-swaps-footer'}
        showTopBorder
      />
    </div>
  );
}