fix: block e-mode exit when LTV=0 collateral assets have outstanding borrows

Author: foodaka

src/components/transactions/Emode/EmodeModalContent.tsx

@@ -51,6 +51,7 @@ import { EmodeActions } from './EmodeActions';
 export enum ErrorType {
   EMODE_DISABLED_LIQUIDATION,
   CLOSE_POSITIONS_BEFORE_SWITCHING,
+  ZERO_LTV_COLLATERAL_BLOCKING,
 }
 
 export type EModeCategoryDisplay = EmodeCategory & {
@@ -138,17 +139,48 @@ export const EmodeModalContent = ({ user }: { user: ExtendedFormattedUser }) =>
     marketReferencePriceInUsd,
   });
 
+  // Check for collateral assets with LTV=0 outside of e-mode that would block exit
+  const zeroLtvCollateralSymbols = user.userReservesData
+    .filter(
+      (userReserve) =>
+        Number(userReserve.scaledATokenBalance) > 0 &&
+        userReserve.reserve.baseLTVasCollateral === '0' &&
+        userReserve.usageAsCollateralEnabledOnUser &&
+        userReserve.reserve.reserveLiquidationThreshold !== '0'
+    )
+    .map((r) => r.reserve.symbol);
+
+  const hasBorrows = Number(user.totalBorrowsUSD) > 0;
+
   // error handling
   let blockingError: ErrorType | undefined = undefined;
   // if user is disabling eMode
   if (user.isInEmode && disableEmode) {
-    if (Number(newSummary.healthFactor) < 1.01 && newSummary.healthFactor !== '-1') {
-      blockingError = ErrorType.EMODE_DISABLED_LIQUIDATION; // intl.formatMessage(messages.eModeDisabledLiquidation);
+    if (hasBorrows && zeroLtvCollateralSymbols.length > 0) {
+      blockingError = ErrorType.ZERO_LTV_COLLATERAL_BLOCKING;
+    } else if (Number(newSummary.healthFactor) < 1.01 && newSummary.healthFactor !== '-1') {
+      blockingError = ErrorType.EMODE_DISABLED_LIQUIDATION;
     }
   }
 
   const Blocked: React.FC = () => {
     switch (blockingError) {
+      case ErrorType.ZERO_LTV_COLLATERAL_BLOCKING:
+        return (
+          <Warning severity="info" sx={{ mt: 6, alignItems: 'center' }}>
+            <Typography variant="subheader1">
+              <Trans>Cannot disable E-Mode</Trans>
+            </Typography>
+            <Typography variant="caption">
+              <Trans>
+                You must repay your borrow positions before exiting E-Mode.{' '}
+                {zeroLtvCollateralSymbols.join(', ')}{' '}
+                {zeroLtvCollateralSymbols.length === 1 ? 'has' : 'have'} 0 LTV outside of E-Mode and
+                cannot remain as collateral.
+              </Trans>
+            </Typography>
+          </Warning>
+        );
       case ErrorType.EMODE_DISABLED_LIQUIDATION:
         return (
           <Warning severity="error" sx={{ mt: 6, alignItems: 'center' }}>
@@ -233,7 +265,7 @@ export const EmodeModalContent = ({ user }: { user: ExtendedFormattedUser }) =>
         </Trans>
       </Typography>
 
-      {blockingError === ErrorType.EMODE_DISABLED_LIQUIDATION && <Blocked />}
+      {blockingError !== undefined && <Blocked />}
       {showLiquidationRiskWarning && (
         <Warning severity="error" sx={{ mt: 6, alignItems: 'center' }}>
           <Typography variant="subheader1" color="#4F1919">

src/locales/el/messages.js

@@ -2448,6 +2448,7 @@ msgstr "supply"
 msgid "Supply"
 msgstr "Supply"
 
+#: src/components/transactions/Emode/EmodeModalContent.tsx
 #: src/components/transactions/Emode/EmodeModalContent.tsx
 msgid "Cannot disable E-Mode"
 msgstr "Cannot disable E-Mode"
@@ -3638,6 +3639,10 @@ msgstr "Exchange rate"
 msgid "You unstake here"
 msgstr "You unstake here"
 
+#: src/components/transactions/Emode/EmodeModalContent.tsx
+msgid "You must repay your borrow positions before exiting E-Mode. {0} {1} 0 LTV outside of E-Mode and cannot remain as collateral."
+msgstr "You must repay your borrow positions before exiting E-Mode. {0} {1} 0 LTV outside of E-Mode and cannot remain as collateral."
+
 #: src/components/caps/CapsHint.tsx
 #: src/modules/dashboard/lists/BorrowAssetsList/BorrowAssetsListMobileItem.tsx
 #: src/modules/reserve-overview/ReserveActions.tsx