feat(expert mode): Add expert mode (#828)

* Add expert mode scaffolding

* move advanced settings to settings tab, add expert mode

* update settings modal

* update font weight

* fix text

* update with modal
;

* add null checks

* update with input checking

* merge and add fixes

* update language and bg
Co-authored-by: ianlapham <ianlapham@gmail.com>

src/components/Button/index.tsx

@@ -244,6 +244,9 @@ const ButtonErrorStyle = styled(Base)`
   &:disabled {
     opacity: 50%;
     cursor: auto;
+    box-shadow: none;
+    background-color: ${({ theme }) => theme.red1};
+    border: 1px solid ${({ theme }) => theme.red1};
   }
 `
 

src/components/Header/index.tsx

@@ -17,6 +17,7 @@ import { useTokenBalanceTreatingWETHasETH } from '../../state/wallet/hooks'
 import { ExternalLink, StyledInternalLink } from '../../theme'
 import { YellowCard } from '../Card'
 import { AutoColumn } from '../Column'
+import Settings from '../Settings'
 import Menu from '../Menu'
 
 import Row, { RowBetween } from '../Row'
@@ -31,15 +32,12 @@ const HeaderFrame = styled.div`
   width: 100%;
   top: 0;
   position: absolute;
-
-  pointer-events: none;
-
+  z-index: 2;
   ${({ theme }) => theme.mediaWidth.upToExtraSmall`
     padding: 12px 0 0 0;
     width: calc(100%);
     position: relative;
   `};
-  z-index: 2;
 `
 
 const HeaderElement = styled.div`
@@ -130,6 +128,12 @@ const NETWORK_LABELS: { [chainId in ChainId]: string | null } = {
   [ChainId.KOVAN]: 'Kovan'
 }
 
+const BalanceWrapper = styled.div`
+  ${({ theme }) => theme.mediaWidth.upToExtraSmall`
+    display: none;
+  `};
+`
+
 export default function Header() {
   const { account, chainId } = useActiveWeb3React()
 
@@ -174,16 +178,17 @@ export default function Header() {
             {!isMobile && NETWORK_LABELS[chainId] && <NetworkCard>{NETWORK_LABELS[chainId]}</NetworkCard>}
           </TestnetWrapper>
           <AccountElement active={!!account} style={{ pointerEvents: 'auto' }}>
-            {account && userEthBalance ? (
-              <Text style={{ flexShrink: 0 }} pl="0.75rem" pr="0.5rem" fontWeight={500}>
-                {userEthBalance?.toSignificant(4)} ETH
-              </Text>
-            ) : null}
+            <BalanceWrapper>
+              {account && userEthBalance ? (
+                <Text style={{ flexShrink: 0 }} pl="0.75rem" pr="0.5rem" fontWeight={500}>
+                  {userEthBalance?.toSignificant(4)} ETH
+                </Text>
+              ) : null}
+            </BalanceWrapper>
             <Web3Status />
           </AccountElement>
-          <div style={{ pointerEvents: 'auto' }}>
-            <Menu />
-          </div>
+          <Settings />
+          <Menu />
         </HeaderElement>
       </RowBetween>
     </HeaderFrame>

src/components/Settings/index.tsx

+import React, { useRef, useEffect, useContext, useState } from 'react'
+import { Settings, X } from 'react-feather'
+import styled from 'styled-components'
+
+import {
+  useUserSlippageTolerance,
+  useExpertModeManager,
+  useUserDeadline,
+  useDarkModeManager
+} from '../../state/user/hooks'
+import SlippageTabs from '../SlippageTabs'
+import { RowFixed, RowBetween } from '../Row'
+import { TYPE } from '../../theme'
+import QuestionHelper from '../QuestionHelper'
+import Toggle from '../Toggle'
+import { ThemeContext } from 'styled-components'
+import { AutoColumn } from '../Column'
+import { ButtonError } from '../Button'
+import { useSettingsMenuOpen, useToggleSettingsMenu } from '../../state/application/hooks'
+import { Text } from 'rebass'
+import Modal from '../Modal'
+
+const StyledMenuIcon = styled(Settings)`
+  height: 20px;
+  width: 20px;
+
+  > * {
+    stroke: ${({ theme }) => theme.text1};
+  }
+`
+
+const StyledCloseIcon = styled(X)`
+  height: 20px;
+  width: 20px;
+  :hover {
+    cursor: pointer;
+  }
+
+  > * {
+    stroke: ${({ theme }) => theme.text1};
+  }
+`
+
+const StyledMenuButton = styled.button`
+  position: relative;
+  width: 100%;
+  height: 100%;
+  border: none;
+  background-color: transparent;
+  margin: 0;
+  padding: 0;
+  height: 35px;
+  background-color: ${({ theme }) => theme.bg3};
+
+  padding: 0.15rem 0.5rem;
+  border-radius: 0.5rem;
+
+  :hover,
+  :focus {
+    cursor: pointer;
+    outline: none;
+    background-color: ${({ theme }) => theme.bg4};
+  }
+
+  svg {
+    margin-top: 2px;
+  }
+`
+const EmojiWrapper = styled.div`
+  position: absolute;
+  bottom: -6px;
+  right: 0px;
+  font-size: 14px;
+`
+
+const StyledMenu = styled.div`
+  margin-left: 0.5rem;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  position: relative;
+  border: none;
+  text-align: left;
+`
+
+const MenuFlyout = styled.span`
+  min-width: 20.125rem;
+  background-color: ${({ theme }) => theme.bg1};
+  box-shadow: 0px 0px 1px rgba(0, 0, 0, 0.01), 0px 4px 8px rgba(0, 0, 0, 0.04), 0px 16px 24px rgba(0, 0, 0, 0.04),
+    0px 24px 32px rgba(0, 0, 0, 0.01);
+  border-radius: 0.5rem;
+  display: flex;
+  flex-direction: column;
+  font-size: 1rem;
+  position: absolute;
+  top: 3rem;
+  right: 0rem;
+  z-index: 100;
+
+  ${({ theme }) => theme.mediaWidth.upToExtraSmall`
+    min-width: 18.125rem;
+    right: -46px;
+  `};
+`
+
+const Break = styled.div`
+  width: 100%;
+  height: 1px;
+  background-color: ${({ theme }) => theme.bg3};
+`
+
+const ModalContentWrapper = styled.div`
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 2rem 0;
+  background-color: ${({ theme }) => theme.bg2};
+  border-radius: 20px;
+`
+
+export default function SettingsTab() {
+  const node = useRef<HTMLDivElement>()
+  const open = useSettingsMenuOpen()
+  const toggle = useToggleSettingsMenu()
+
+  const theme = useContext(ThemeContext)
+  const [userSlippageTolerance, setUserslippageTolerance] = useUserSlippageTolerance()
+
+  const [deadline, setDeadline] = useUserDeadline()
+
+  const [expertMode, toggleExpertMode] = useExpertModeManager()
+
+  const [darkMode, toggleDarkMode] = useDarkModeManager()
+
+  // show confirmation view before turning on
+  const [showConfirmation, setShowConfirmation] = useState(false)
+
+  useEffect(() => {
+    const handleClickOutside = e => {
+      if (node.current?.contains(e.target) ?? false) {
+        return
+      }
+      toggle()
+    }
+
+    if (open) {
+      document.addEventListener('mousedown', handleClickOutside)
+    } else {
+      document.removeEventListener('mousedown', handleClickOutside)
+    }
+
+    return () => {
+      document.removeEventListener('mousedown', handleClickOutside)
+    }
+  }, [open, toggle])
+
+  return (
+    <StyledMenu ref={node}>
+      <Modal isOpen={showConfirmation} onDismiss={() => setShowConfirmation(false)}>
+        <ModalContentWrapper>
+          <AutoColumn gap="lg">
+            <RowBetween style={{ padding: '0 2rem' }}>
+              <div />
+              <Text fontWeight={500} fontSize={20}>
+                Are you sure?
+              </Text>
+              <StyledCloseIcon onClick={() => setShowConfirmation(false)} />
+            </RowBetween>
+            <Break />
+            <AutoColumn gap="lg" style={{ padding: '0 2rem' }}>
+              <Text fontWeight={500} fontSize={20}>
+                Expert mode turns off the confirm transaction prompt and allows high slippage trades that often result
+                in bad rates and lost funds.
+              </Text>
+              <Text fontWeight={600} fontSize={20}>
+                ONLY USE THIS MODE IF YOU KNOW WHAT YOU ARE DOING.
+              </Text>
+              <ButtonError
+                error={true}
+                padding={'12px'}
+                onClick={() => {
+                  if (window.prompt(`Please type the word "confirm" to enable expert mode.`) === 'confirm') {
+                    toggleExpertMode()
+                    setShowConfirmation(false)
+                  }
+                }}
+              >
+                <Text fontSize={20} fontWeight={500}>
+                  Turn On Expert Mode
+                </Text>
+              </ButtonError>
+            </AutoColumn>
+          </AutoColumn>
+        </ModalContentWrapper>
+      </Modal>
+      <StyledMenuButton onClick={toggle}>
+        <StyledMenuIcon />
+        {expertMode && (
+          <EmojiWrapper>
+            <span role="img" aria-label="wizard-icon">
+              🧙
+            </span>
+          </EmojiWrapper>
+        )}
+      </StyledMenuButton>
+      {open && (
+        <MenuFlyout>
+          <AutoColumn gap="md" style={{ padding: '1rem' }}>
+            <Text fontWeight={600} fontSize={14}>
+              Transaction Settings
+            </Text>
+            <SlippageTabs
+              rawSlippage={userSlippageTolerance}
+              setRawSlippage={setUserslippageTolerance}
+              deadline={deadline}
+              setDeadline={setDeadline}
+            />
+            <Text fontWeight={600} fontSize={14}>
+              Interface Settings
+            </Text>
+            <RowBetween>
+              <RowFixed>
+                <TYPE.black fontWeight={400} fontSize={14} color={theme.text2}>
+                  Toggle Expert Mode
+                </TYPE.black>
+                <QuestionHelper text="Bypasses confirmation modals and allows high slippage trades. Use at your own risk." />
+              </RowFixed>
+              <Toggle
+                isActive={expertMode}
+                toggle={
+                  expertMode
+                    ? () => {
+                        toggleExpertMode()
+                        setShowConfirmation(false)
+                      }
+                    : () => setShowConfirmation(true)
+                }
+              />
+            </RowBetween>
+            <RowBetween>
+              <RowFixed>
+                <TYPE.black fontWeight={400} fontSize={14} color={theme.text2}>
+                  Toggle Dark Mode
+                </TYPE.black>
+              </RowFixed>
+              <Toggle isActive={darkMode} toggle={toggleDarkMode} />
+            </RowBetween>
+          </AutoColumn>
+        </MenuFlyout>
+      )}
+    </StyledMenu>
+  )
+}

src/components/SlippageTabs/index.tsx

@@ -78,10 +78,6 @@ const OptionCustom = styled(FancyButton)<{ active?: boolean; warning?: boolean }
   }
 `
 
-const SlippageSelector = styled.div`
-  padding: 0 20px;
-`
-
 export interface SlippageTabsProps {
   rawSlippage: number
   setRawSlippage: (rawSlippage: number) => void
@@ -146,15 +142,14 @@ export default function SlippageTabs({ rawSlippage, setRawSlippage, deadline, se
   }
 
   return (
-    <>
-      <RowFixed padding={'0 20px'}>
-        <TYPE.black fontWeight={400} fontSize={14} color={theme.text2}>
-          Set slippage tolerance
-        </TYPE.black>
-        <QuestionHelper text="Your transaction will revert if the price changes unfavorably by more than this percentage." />
-      </RowFixed>
-
-      <SlippageSelector>
+    <AutoColumn gap="md">
+      <AutoColumn gap="sm">
+        <RowFixed>
+          <TYPE.black fontWeight={400} fontSize={14} color={theme.text2}>
+            Slippage tolerance
+          </TYPE.black>
+          <QuestionHelper text="Your transaction will revert if the price changes unfavorably by more than this percentage." />
+        </RowFixed>
         <RowBetween>
           <Option
             onClick={() => {
@@ -220,16 +215,16 @@ export default function SlippageTabs({ rawSlippage, setRawSlippage, deadline, se
               : 'Your transaction may be frontrun'}
           </RowBetween>
         )}
-      </SlippageSelector>
+      </AutoColumn>
 
       <AutoColumn gap="sm">
-        <RowFixed padding={'0 20px'}>
+        <RowFixed>
           <TYPE.black fontSize={14} fontWeight={400} color={theme.text2}>
-            Deadline
+            Transaction deadline
           </TYPE.black>
           <QuestionHelper text="Your transaction will revert if it is pending for more than this long." />
         </RowFixed>
-        <RowFixed padding={'0 20px'}>
+        <RowFixed>
           <OptionCustom style={{ width: '80px' }} tabIndex={-1}>
             <Input
               color={!!deadlineError ? 'red' : undefined}
@@ -246,6 +241,6 @@ export default function SlippageTabs({ rawSlippage, setRawSlippage, deadline, se
           </TYPE.body>
         </RowFixed>
       </AutoColumn>
-    </>
+    </AutoColumn>
   )
 }

src/components/Toggle/index.tsx

+import React from 'react'
+import styled from 'styled-components'
+
+const ToggleElement = styled.span<{ isActive?: boolean; isOnSwitch?: boolean }>`
+  padding: 0.25rem 0.5rem;
+  border-radius: 14px;
+  background: ${({ theme, isActive, isOnSwitch }) => (isActive ? (isOnSwitch ? theme.primary1 : theme.text4) : 'none')};
+  color: ${({ theme, isActive, isOnSwitch }) => (isActive ? (isOnSwitch ? theme.white : theme.text2) : theme.text3)};
+  font-size: 0.825rem;
+  font-weight: 400;
+`
+
+const StyledToggle = styled.a<{ isActive?: boolean; activeElement?: boolean }>`
+  border-radius: 16px;
+  border: 1px solid ${({ theme, isActive }) => (isActive ? theme.primary5 : theme.text4)};
+  display: flex;
+  width: fit-content;
+  cursor: pointer;
+  text-decoration: none;
+  :hover {
+    text-decoration: none;
+  }
+`
+
+export interface ToggleProps {
+  isActive: boolean
+  toggle: () => void
+}
+
+export default function Toggle({ isActive, toggle }: ToggleProps) {
+  return (
+    <StyledToggle isActive={isActive} target="_self" onClick={toggle}>
+      <ToggleElement isActive={isActive} isOnSwitch={true}>
+        On
+      </ToggleElement>
+      <ToggleElement isActive={!isActive} isOnSwitch={false}>
+        Off
+      </ToggleElement>
+    </StyledToggle>
+  )
+}

src/components/swap/AdvancedSwapDetails.tsx

@@ -10,10 +10,10 @@ import { AutoColumn } from '../Column'
 import { SectionBreak } from './styleds'
 import QuestionHelper from '../QuestionHelper'
 import { RowBetween, RowFixed } from '../Row'
-import SlippageTabs, { SlippageTabsProps } from '../SlippageTabs'
 import FormattedPriceImpact from './FormattedPriceImpact'
 import TokenLogo from '../TokenLogo'
 import flatMap from 'lodash.flatmap'
+import { useUserSlippageTolerance } from '../../state/user/hooks'
 
 function TradeSummary({ trade, allowedSlippage }: { trade: Trade; allowedSlippage: number }) {
   const theme = useContext(ThemeContext)
@@ -61,20 +61,20 @@ function TradeSummary({ trade, allowedSlippage }: { trade: Trade; allowedSlippag
           </TYPE.black>
         </RowBetween>
       </AutoColumn>
-
-      <SectionBreak />
     </>
   )
 }
 
-export interface AdvancedSwapDetailsProps extends SlippageTabsProps {
+export interface AdvancedSwapDetailsProps {
   trade?: Trade
   onDismiss: () => void
 }
 
-export function AdvancedSwapDetails({ trade, onDismiss, ...slippageTabProps }: AdvancedSwapDetailsProps) {
+export function AdvancedSwapDetails({ trade, onDismiss }: AdvancedSwapDetailsProps) {
   const theme = useContext(ThemeContext)
 
+  const [allowedSlippage] = useUserSlippageTolerance()
+
   return (
     <AutoColumn gap="md">
       <CursorPointer>
@@ -85,13 +85,9 @@ export function AdvancedSwapDetails({ trade, onDismiss, ...slippageTabProps }: A
           <ChevronUp color={theme.text2} />
         </RowBetween>
       </CursorPointer>
-
       <SectionBreak />
-
-      {trade && <TradeSummary trade={trade} allowedSlippage={slippageTabProps.rawSlippage} />}
-
-      <SlippageTabs {...slippageTabProps} />
-
+      {trade && <TradeSummary trade={trade} allowedSlippage={allowedSlippage} />}
+      {trade?.route?.path?.length > 2 && <SectionBreak />}
       {trade?.route?.path?.length > 2 && (
         <AutoColumn style={{ padding: '0 20px' }}>
           <RowFixed>

src/components/swap/PriceSlippageWarningCard.tsx

-import { Percent } from '@uniswap/sdk'
-import React, { useContext } from 'react'
-import { Text } from 'rebass'
-import { ThemeContext } from 'styled-components'
-import { YellowCard } from '../Card'
-import { AutoColumn } from '../Column'
-import { RowBetween, RowFixed } from '../Row'
-
-export function PriceSlippageWarningCard({ priceSlippage }: { priceSlippage: Percent }) {
-  const theme = useContext(ThemeContext)
-  return (
-    <YellowCard style={{ padding: '20px', paddingTop: '10px' }}>
-      <AutoColumn gap="md">
-        <RowBetween>
-          <RowFixed style={{ paddingTop: '8px' }}>
-            <span role="img" aria-label="warning">
-              ⚠️
-            </span>{' '}
-            <Text fontWeight={500} marginLeft="4px" color={theme.text1}>
-              Price Warning
-            </Text>
-          </RowFixed>
-        </RowBetween>
-        <Text lineHeight="145.23%;" fontSize={16} fontWeight={400} color={theme.text1}>
-          This trade will move the price by ~{priceSlippage.toFixed(2)}%.
-        </Text>
-      </AutoColumn>
-    </YellowCard>
-  )
-}

src/components/swap/styleds.ts

@@ -45,9 +45,15 @@ export const BottomGrouping = styled.div`
   position: relative;
 `
 
-export const ErrorText = styled(Text)<{ severity?: 0 | 1 | 2 | 3 }>`
+export const ErrorText = styled(Text)<{ severity?: 0 | 1 | 2 | 3 | 4 }>`
   color: ${({ theme, severity }) =>
-    severity === 3 ? theme.red1 : severity === 2 ? theme.yellow2 : severity === 1 ? theme.text1 : theme.green1};
+    severity === 3 || severity === 4
+      ? theme.red1
+      : severity === 2
+      ? theme.yellow2
+      : severity === 1
+      ? theme.text1
+      : theme.green1};
 `
 
 export const InputGroup = styled(AutoColumn)`

src/constants/index.ts

@@ -153,6 +153,8 @@ export const BIPS_BASE = JSBI.BigInt(10000)
 export const ALLOWED_PRICE_IMPACT_LOW: Percent = new Percent(JSBI.BigInt(100), BIPS_BASE) // 1%
 export const ALLOWED_PRICE_IMPACT_MEDIUM: Percent = new Percent(JSBI.BigInt(500), BIPS_BASE) // 5%
 export const ALLOWED_PRICE_IMPACT_HIGH: Percent = new Percent(JSBI.BigInt(1000), BIPS_BASE) // 10%
+// for non expert mode disable swaps above this
+export const BLOCKED_PRICE_IMPACT_NON_EXPERT: Percent = new Percent(JSBI.BigInt(5000), BIPS_BASE) // 50%
 
 // if the price slippage exceeds this number, force the user to type 'confirm' to execute
 export const PRICE_IMPACT_WITHOUT_FEE_CONFIRM_MIN: Percent = new Percent(JSBI.BigInt(2500), BIPS_BASE) // 25%

src/hooks/useSwapCallback.ts

@@ -60,8 +60,8 @@ function getSwapType(trade: Trade | undefined): SwapType | undefined {
 // and the user has approved the slippage adjusted input amount for the trade
 export function useSwapCallback(
   trade?: Trade, // trade to execute, required
-  allowedSlippage: number = INITIAL_ALLOWED_SLIPPAGE, // in bips, optional
-  deadline: number = DEFAULT_DEADLINE_FROM_NOW, // in seconds from now, optional
+  allowedSlippage: number = INITIAL_ALLOWED_SLIPPAGE, // in bips
+  deadline: number = DEFAULT_DEADLINE_FROM_NOW, // in seconds from now
   to?: string // recipient of output, optional
 ): null | (() => Promise<string>) {
   const { account, chainId, library } = useActiveWeb3React()

src/pages/AddLiquidity/index.tsx

@@ -17,7 +17,7 @@ import Row, { AutoRow, RowBetween, RowFixed, RowFlat } from '../../components/Ro
 
 import TokenLogo from '../../components/TokenLogo'
 
-import { ROUTER_ADDRESS, MIN_ETH, ONE_BIPS, DEFAULT_DEADLINE_FROM_NOW, INITIAL_ALLOWED_SLIPPAGE } from '../../constants'
+import { ROUTER_ADDRESS, MIN_ETH, ONE_BIPS } from '../../constants'
 import { useActiveWeb3React } from '../../hooks'
 
 import { useTransactionAdder } from '../../state/transactions/hooks'
@@ -34,7 +34,7 @@ import {
 import { Field } from '../../state/mint/actions'
 import { useApproveCallback, ApprovalState } from '../../hooks/useApproveCallback'
 import { useWalletModalToggle } from '../../state/application/hooks'
-import AdvancedSwapDetailsDropdown from '../../components/swap/AdvancedSwapDetailsDropdown'
+import { useUserSlippageTolerance, useUserDeadline, useIsExpertMode } from '../../state/user/hooks'
 
 export default function AddLiquidity({ match: { params } }: RouteComponentProps<{ tokens: string }>) {
   useDefaultsFromURLMatchParams(params)
@@ -45,6 +45,8 @@ export default function AddLiquidity({ match: { params } }: RouteComponentProps<
   // toggle wallet when disconnected
   const toggleWalletModal = useWalletModalToggle()
 
+  const expertMode = useIsExpertMode()
+
   // mint state
   const { independentField, typedValue, otherTypedValue } = useMintState()
   const {
@@ -64,14 +66,13 @@ export default function AddLiquidity({ match: { params } }: RouteComponentProps<
   const isValid = !error
 
   // modal and loading
-  const [showAdvanced, setShowAdvanced] = useState<boolean>(false) // toggling slippage, deadline, etc. on and off
-  const [showConfirm, setShowConfirm] = useState<boolean>(false) // show confirmation modal
-  const [attemptingTxn, setAttemptingTxn] = useState<boolean>(false) // waiting for user confirmaion/rejection
-  const [txHash, setTxHash] = useState<string>('')
+  const [showConfirm, setShowConfirm] = useState<boolean>(false)
+  const [attemptingTxn, setAttemptingTxn] = useState<boolean>(false) // clicked confirm
 
-  // tx parameters
-  const [deadline, setDeadline] = useState<number>(DEFAULT_DEADLINE_FROM_NOW)
-  const [allowedSlippage, setAllowedSlippage] = useState<number>(INITIAL_ALLOWED_SLIPPAGE)
+  // txn values
+  const [deadline] = useUserDeadline() // custom from users settings
+  const [allowedSlippage] = useUserSlippageTolerance() // custom from users
+  const [txHash, setTxHash] = useState<string>('')
 
   // get formatted amounts
   const formattedAmounts = {
@@ -427,7 +428,7 @@ export default function AddLiquidity({ match: { params } }: RouteComponentProps<
                   )}
                 <ButtonError
                   onClick={() => {
-                    setShowConfirm(true)
+                    expertMode ? onAdd() : setShowConfirm(true)
                   }}
                   disabled={!isValid || approvalA !== ApprovalState.APPROVED || approvalB !== ApprovalState.APPROVED}
                   error={!isValid && !!parsedAmounts[Field.TOKEN_A] && !!parsedAmounts[Field.TOKEN_B]}
@@ -442,17 +443,6 @@ export default function AddLiquidity({ match: { params } }: RouteComponentProps<
         </Wrapper>
       </AppBody>
 
-      {isValid && !!parsedAmounts[Field.TOKEN_A] && !!parsedAmounts[Field.TOKEN_B] ? (
-        <AdvancedSwapDetailsDropdown
-          rawSlippage={allowedSlippage}
-          deadline={deadline}
-          showAdvanced={showAdvanced}
-          setShowAdvanced={setShowAdvanced}
-          setDeadline={setDeadline}
-          setRawSlippage={setAllowedSlippage}
-        />
-      ) : null}
-
       {pair && !noLiquidity ? (
         <AutoColumn style={{ minWidth: '20rem', marginTop: '1rem' }}>
           <PositionCard pair={pair} minimal={true} />

src/pages/RemoveLiquidity/index.tsx

@@ -18,7 +18,7 @@ import Row, { RowBetween, RowFixed } from '../../components/Row'
 
 import Slider from '../../components/Slider'
 import TokenLogo from '../../components/TokenLogo'
-import { ROUTER_ADDRESS, DEFAULT_DEADLINE_FROM_NOW, INITIAL_ALLOWED_SLIPPAGE } from '../../constants'
+import { ROUTER_ADDRESS } from '../../constants'
 import { useActiveWeb3React } from '../../hooks'
 import { usePairContract } from '../../hooks/useContract'
 
@@ -31,9 +31,9 @@ import { useApproveCallback, ApprovalState } from '../../hooks/useApproveCallbac
 import { Dots } from '../../components/swap/styleds'
 import { useDefaultsFromURLMatchParams, useBurnActionHandlers } from '../../state/burn/hooks'
 import { useDerivedBurnInfo, useBurnState } from '../../state/burn/hooks'
-import AdvancedSwapDetailsDropdown from '../../components/swap/AdvancedSwapDetailsDropdown'
 import { Field } from '../../state/burn/actions'
 import { useWalletModalToggle } from '../../state/application/hooks'
+import { useUserDeadline, useUserSlippageTolerance } from '../../state/user/hooks'
 import { BigNumber } from '@ethersproject/bignumber'
 
 export default function RemoveLiquidity({ match: { params } }: RouteComponentProps<{ tokens: string }>) {
@@ -52,15 +52,14 @@ export default function RemoveLiquidity({ match: { params } }: RouteComponentPro
   const isValid = !error
 
   // modal and loading
-  const [showDetailed, setShowDetailed] = useState<boolean>(false) // toggling detailed view
-  const [showAdvanced, setShowAdvanced] = useState<boolean>(false) // toggling slippage, deadline, etc. on and off
-  const [showConfirm, setShowConfirm] = useState<boolean>(false) // show confirmation modal
-  const [attemptingTxn, setAttemptingTxn] = useState<boolean>(false) // waiting for user confirmaion/rejection
-  const [txHash, setTxHash] = useState<string>('')
+  const [showConfirm, setShowConfirm] = useState<boolean>(false)
+  const [showDetailed, setShowDetailed] = useState<boolean>(false)
+  const [attemptingTxn, setAttemptingTxn] = useState(false) // clicked confirm
 
-  // tx parameters
-  const [deadline, setDeadline] = useState<number>(DEFAULT_DEADLINE_FROM_NOW)
-  const [allowedSlippage, setAllowedSlippage] = useState<number>(INITIAL_ALLOWED_SLIPPAGE)
+  // txn values
+  const [txHash, setTxHash] = useState<string>('')
+  const [deadline] = useUserDeadline()
+  const [allowedSlippage] = useUserSlippageTolerance()
 
   const formattedAmounts = {
     [Field.LIQUIDITY_PERCENT]: parsedAmounts[Field.LIQUIDITY_PERCENT].equalTo('0')
@@ -592,17 +591,6 @@ export default function RemoveLiquidity({ match: { params } }: RouteComponentPro
         </Wrapper>
       </AppBody>
 
-      {isValid ? (
-        <AdvancedSwapDetailsDropdown
-          rawSlippage={allowedSlippage}
-          deadline={deadline}
-          showAdvanced={showAdvanced}
-          setShowAdvanced={setShowAdvanced}
-          setDeadline={setDeadline}
-          setRawSlippage={setAllowedSlippage}
-        />
-      ) : null}
-
       {pair ? (
         <AutoColumn style={{ minWidth: '20rem', marginTop: '1rem' }}>
           <PositionCard pair={pair} minimal={true} />

src/pages/Send/index.tsx

@@ -22,19 +22,14 @@ import { TransferModalHeader } from '../../components/swap/TransferModalHeader'
 import BetterTradeLink from '../../components/swap/BetterTradeLink'
 import TokenLogo from '../../components/TokenLogo'
 import { TokenWarningCards } from '../../components/TokenWarningCard'
-import {
-  DEFAULT_DEADLINE_FROM_NOW,
-  INITIAL_ALLOWED_SLIPPAGE,
-  MIN_ETH,
-  BETTER_TRADE_LINK_THRESHOLD
-} from '../../constants'
+import { INITIAL_ALLOWED_SLIPPAGE, MIN_ETH, BETTER_TRADE_LINK_THRESHOLD } from '../../constants'
 import { getTradeVersion, isTradeBetter } from '../../data/V1'
 import { useActiveWeb3React } from '../../hooks'
 import { useApproveCallbackFromTrade, ApprovalState } from '../../hooks/useApproveCallback'
 import { useSendCallback } from '../../hooks/useSendCallback'
 import { useSwapCallback } from '../../hooks/useSwapCallback'
+import { useWalletModalToggle, useToggleSettingsMenu } from '../../state/application/hooks'
 import useToggledVersion, { Version } from '../../hooks/useToggledVersion'
-import { useWalletModalToggle } from '../../state/application/hooks'
 import { Field } from '../../state/swap/actions'
 import {
   useDefaultsFromURLSearch,
@@ -46,7 +41,8 @@ import { useAllTokenBalancesTreatingWETHasETH } from '../../state/wallet/hooks'
 import { CursorPointer, TYPE } from '../../theme'
 import { computeSlippageAdjustedAmounts, computeTradePriceBreakdown, warningSeverity } from '../../utils/prices'
 import AppBody from '../AppBody'
-import { PriceSlippageWarningCard } from '../../components/swap/PriceSlippageWarningCard'
+import { useUserSlippageTolerance, useUserDeadline, useExpertModeManager } from '../../state/user/hooks'
+import { ClickableText } from '../Pool/styleds'
 
 export default function Send() {
   useDefaultsFromURLSearch()
@@ -59,6 +55,10 @@ export default function Send() {
   // toggle wallet when disconnected
   const toggleWalletModal = useWalletModalToggle()
 
+  // for expert mode
+  const toggleSettings = useToggleSettingsMenu()
+  const [expertMode] = useExpertModeManager()
+
   // sending state
   const [sendingWithSwap, setSendingWithSwap] = useState<boolean>(false)
   const [recipient, setRecipient] = useState<string>('')
@@ -102,10 +102,8 @@ export default function Send() {
   const [showConfirm, setShowConfirm] = useState<boolean>(false) // show confirmation modal
   const [attemptingTxn, setAttemptingTxn] = useState<boolean>(false) // waiting for user confirmaion/rejection
   const [txHash, setTxHash] = useState<string>('')
-
-  // tx parameters
-  const [deadline, setDeadline] = useState<number>(DEFAULT_DEADLINE_FROM_NOW)
-  const [allowedSlippage, setAllowedSlippage] = useState<number>(INITIAL_ALLOWED_SLIPPAGE)
+  const [deadline] = useUserDeadline() // custom from user settings
+  const [allowedSlippage] = useUserSlippageTolerance() // custom from user settings
 
   const route = bestTrade?.route
   const userHasSpecifiedInputOutput =
@@ -223,7 +221,8 @@ export default function Send() {
     ((sendingWithSwap && isSwapValid) || (!sendingWithSwap && isSendValid)) &&
     (approval === ApprovalState.NOT_APPROVED ||
       approval === ApprovalState.PENDING ||
-      (approvalSubmitted && approval === ApprovalState.APPROVED))
+      (approvalSubmitted && approval === ApprovalState.APPROVED)) &&
+    !(severity > 3 && !expertMode)
 
   function modalHeader() {
     if (!sendingWithSwap) {
@@ -487,6 +486,20 @@ export default function Send() {
                     <TradePrice showInverted={showInverted} setShowInverted={setShowInverted} trade={bestTrade} />
                   </RowBetween>
 
+                  {allowedSlippage !== INITIAL_ALLOWED_SLIPPAGE && (
+                    <RowBetween align="center">
+                      <ClickableText>
+                        <Text fontWeight={500} fontSize={14} color={theme.text2} onClick={toggleSettings}>
+                          Slippage Tolerance
+                        </Text>
+                      </ClickableText>
+                      <ClickableText>
+                        <Text fontWeight={500} fontSize={14} color={theme.text2} onClick={toggleSettings}>
+                          {allowedSlippage ? allowedSlippage / 100 : '-'}%
+                        </Text>
+                      </ClickableText>
+                    </RowBetween>
+                  )}
                   {bestTrade && severity > 1 && (
                     <RowBetween>
                       <TYPE.main
@@ -536,7 +549,7 @@ export default function Send() {
                 </ButtonPrimary>
                 <ButtonError
                   onClick={() => {
-                    setShowConfirm(true)
+                    expertMode ? (sendingWithSwap ? onSwap() : onSend()) : setShowConfirm(true)
                   }}
                   width="48%"
                   id="send-button"
@@ -544,23 +557,28 @@ export default function Send() {
                   error={sendingWithSwap && isSwapValid && severity > 2}
                 >
                   <Text fontSize={16} fontWeight={500}>
-                    {`Send${severity > 2 ? ' Anyway' : ''}`}
+                    {severity > 3 && !expertMode ? `Price Impact High` : `Send${severity > 2 ? ' Anyway' : ''}`}
                   </Text>
                 </ButtonError>
               </RowBetween>
             ) : (
               <ButtonError
                 onClick={() => {
-                  setShowConfirm(true)
+                  expertMode ? (sendingWithSwap ? onSwap() : onSend()) : setShowConfirm(true)
                 }}
                 id="send-button"
-                disabled={(sendingWithSwap && !isSwapValid) || (!sendingWithSwap && !isSendValid)}
+                disabled={
+                  (sendingWithSwap && !isSwapValid) ||
+                  (!sendingWithSwap && !isSendValid) ||
+                  (severity > 3 && !expertMode && sendingWithSwap)
+                }
                 error={sendingWithSwap && isSwapValid && severity > 2}
               >
                 <Text fontSize={20} fontWeight={500}>
                   {(sendingWithSwap ? swapError : null) ||
                     sendAmountError ||
                     recipientError ||
+                    (severity > 3 && !expertMode && `Price Impact Too High`) ||
                     `Send${severity > 2 ? ' Anyway' : ''}`}
                 </Text>
               </ButtonError>
@@ -571,21 +589,7 @@ export default function Send() {
       </AppBody>
 
       {bestTrade && (
-        <AdvancedSwapDetailsDropdown
-          trade={bestTrade}
-          rawSlippage={allowedSlippage}
-          deadline={deadline}
-          showAdvanced={showAdvanced}
-          setShowAdvanced={setShowAdvanced}
-          setDeadline={setDeadline}
-          setRawSlippage={setAllowedSlippage}
-        />
-      )}
-
-      {priceImpactWithoutFee && severity > 2 && (
-        <AutoColumn gap="lg" style={{ marginTop: '1rem' }}>
-          <PriceSlippageWarningCard priceSlippage={priceImpactWithoutFee} />
-        </AutoColumn>
+        <AdvancedSwapDetailsDropdown trade={bestTrade} showAdvanced={showAdvanced} setShowAdvanced={setShowAdvanced} />
       )}
     </>
   )

src/pages/Swap/index.tsx

@@ -20,18 +20,15 @@ import SwapModalHeader from '../../components/swap/SwapModalHeader'
 import TradePrice from '../../components/swap/TradePrice'
 import BetterTradeLink from '../../components/swap/BetterTradeLink'
 import { TokenWarningCards } from '../../components/TokenWarningCard'
-import {
-  DEFAULT_DEADLINE_FROM_NOW,
-  INITIAL_ALLOWED_SLIPPAGE,
-  MIN_ETH,
-  BETTER_TRADE_LINK_THRESHOLD
-} from '../../constants'
-import { getTradeVersion, isTradeBetter } from '../../data/V1'
 import { useActiveWeb3React } from '../../hooks'
 import { useApproveCallbackFromTrade, ApprovalState } from '../../hooks/useApproveCallback'
 import { useSwapCallback } from '../../hooks/useSwapCallback'
+import { useWalletModalToggle, useToggleSettingsMenu } from '../../state/application/hooks'
+import { useExpertModeManager, useUserSlippageTolerance, useUserDeadline } from '../../state/user/hooks'
+
+import { INITIAL_ALLOWED_SLIPPAGE, MIN_ETH, BETTER_TRADE_LINK_THRESHOLD } from '../../constants'
+import { getTradeVersion, isTradeBetter } from '../../data/V1'
 import useToggledVersion, { Version } from '../../hooks/useToggledVersion'
-import { useWalletModalToggle } from '../../state/application/hooks'
 import { Field } from '../../state/swap/actions'
 import {
   useDefaultsFromURLSearch,
@@ -42,7 +39,7 @@ import {
 import { CursorPointer, TYPE } from '../../theme'
 import { computeSlippageAdjustedAmounts, computeTradePriceBreakdown, warningSeverity } from '../../utils/prices'
 import AppBody from '../AppBody'
-import { PriceSlippageWarningCard } from '../../components/swap/PriceSlippageWarningCard'
+import { ClickableText } from '../Pool/styleds'
 
 export default function Swap() {
   useDefaultsFromURLSearch()
@@ -53,6 +50,14 @@ export default function Swap() {
   // toggle wallet when disconnected
   const toggleWalletModal = useWalletModalToggle()
 
+  // for expert mode
+  const toggleSettings = useToggleSettingsMenu()
+  const [expertMode] = useExpertModeManager()
+
+  // get custom setting values for user
+  const [deadline] = useUserDeadline()
+  const [allowedSlippage] = useUserSlippageTolerance()
+
   // swap state
   const { independentField, typedValue } = useSwapState()
   const { bestTrade: bestTradeV2, tokenBalances, parsedAmount, tokens, error, v1Trade } = useDerivedSwapInfo()
@@ -84,10 +89,6 @@ export default function Swap() {
   const [attemptingTxn, setAttemptingTxn] = useState<boolean>(false) // waiting for user confirmaion/rejection
   const [txHash, setTxHash] = useState<string>('')
 
-  // tx parameters
-  const [deadline, setDeadline] = useState<number>(DEFAULT_DEADLINE_FROM_NOW)
-  const [allowedSlippage, setAllowedSlippage] = useState<number>(INITIAL_ALLOWED_SLIPPAGE)
-
   const formattedAmounts = {
     [independentField]: typedValue,
     [dependentField]: parsedAmounts[dependentField] ? parsedAmounts[dependentField].toSignificant(6) : ''
@@ -107,13 +108,6 @@ export default function Swap() {
   // check if user has gone through approval process, used to show two step buttons, reset on token change
   const [approvalSubmitted, setApprovalSubmitted] = useState<boolean>(false)
 
-  // show approve flow when: no error on inputs, not approved or pending, or approved in current session
-  const showApproveFlow =
-    !error &&
-    (approval === ApprovalState.NOT_APPROVED ||
-      approval === ApprovalState.PENDING ||
-      (approvalSubmitted && approval === ApprovalState.APPROVED))
-
   // mark when a user has submitted an approval, reset onTokenSelection for input field
   useEffect(() => {
     if (approval === ApprovalState.PENDING) {
@@ -146,7 +140,6 @@ export default function Swap() {
     if (priceImpactWithoutFee && !confirmPriceImpactWithoutFee(priceImpactWithoutFee)) {
       return
     }
-
     setAttemptingTxn(true)
     swapCallback()
       .then(hash => {
@@ -178,6 +171,15 @@ export default function Swap() {
   // warnings on slippage
   const priceImpactSeverity = warningSeverity(priceImpactWithoutFee)
 
+  // show approve flow when: no error on inputs, not approved or pending, or approved in current session
+  // never show if price impact is above threshold in non expert mode
+  const showApproveFlow =
+    !error &&
+    (approval === ApprovalState.NOT_APPROVED ||
+      approval === ApprovalState.PENDING ||
+      (approvalSubmitted && approval === ApprovalState.APPROVED)) &&
+    !(priceImpactSeverity > 3 && !expertMode)
+
   function modalHeader() {
     return (
       <SwapModalHeader
@@ -292,6 +294,17 @@ export default function Swap() {
                     <TradePrice trade={bestTrade} showInverted={showInverted} setShowInverted={setShowInverted} />
                   </RowBetween>
 
+                  {allowedSlippage !== INITIAL_ALLOWED_SLIPPAGE && (
+                    <RowBetween align="center">
+                      <ClickableText fontWeight={500} fontSize={14} color={theme.text2} onClick={toggleSettings}>
+                        Slippage Tolerance
+                      </ClickableText>
+                      <ClickableText fontWeight={500} fontSize={14} color={theme.text2} onClick={toggleSettings}>
+                        {allowedSlippage ? allowedSlippage / 100 : '-'}%
+                      </ClickableText>
+                    </RowBetween>
+                  )}
+
                   {bestTrade && priceImpactSeverity > 1 && (
                     <RowBetween>
                       <TYPE.main
@@ -335,29 +348,35 @@ export default function Swap() {
                 </ButtonPrimary>
                 <ButtonError
                   onClick={() => {
-                    setShowConfirm(true)
+                    expertMode ? onSwap() : setShowConfirm(true)
                   }}
                   width="48%"
                   id="swap-button"
-                  disabled={!isValid || approval !== ApprovalState.APPROVED}
+                  disabled={!isValid || approval !== ApprovalState.APPROVED || (priceImpactSeverity > 3 && !expertMode)}
                   error={isValid && priceImpactSeverity > 2}
                 >
                   <Text fontSize={16} fontWeight={500}>
-                    {`Swap${priceImpactSeverity > 2 ? ' Anyway' : ''}`}
+                    {priceImpactSeverity > 3 && !expertMode
+                      ? `Price Impact High`
+                      : `Swap${priceImpactSeverity > 2 ? ' Anyway' : ''}`}
                   </Text>
                 </ButtonError>
               </RowBetween>
             ) : (
               <ButtonError
                 onClick={() => {
-                  setShowConfirm(true)
+                  expertMode ? onSwap() : setShowConfirm(true)
                 }}
                 id="swap-button"
-                disabled={!isValid}
+                disabled={!isValid || (priceImpactSeverity > 3 && !expertMode)}
                 error={isValid && priceImpactSeverity > 2}
               >
                 <Text fontSize={20} fontWeight={500}>
-                  {error ?? `Swap${priceImpactSeverity > 2 ? ' Anyway' : ''}`}
+                  {error
+                    ? error
+                    : priceImpactSeverity > 3 && !expertMode
+                    ? `Price Impact Too High`
+                    : `Swap${priceImpactSeverity > 2 ? ' Anyway' : ''}`}
                 </Text>
               </ButtonError>
             )}
@@ -367,21 +386,7 @@ export default function Swap() {
       </AppBody>
 
       {bestTrade && (
-        <AdvancedSwapDetailsDropdown
-          trade={bestTrade}
-          rawSlippage={allowedSlippage}
-          deadline={deadline}
-          showAdvanced={showAdvanced}
-          setShowAdvanced={setShowAdvanced}
-          setDeadline={setDeadline}
-          setRawSlippage={setAllowedSlippage}
-        />
-      )}
-
-      {priceImpactWithoutFee && priceImpactSeverity > 2 && (
-        <AutoColumn gap="lg" style={{ marginTop: '1rem' }}>
-          <PriceSlippageWarningCard priceSlippage={priceImpactWithoutFee} />
-        </AutoColumn>
+        <AdvancedSwapDetailsDropdown trade={bestTrade} showAdvanced={showAdvanced} setShowAdvanced={setShowAdvanced} />
       )}
     </>
   )

src/state/application/actions.ts

@@ -23,5 +23,6 @@ export type PopupContent =
 
 export const updateBlockNumber = createAction<{ chainId: number; blockNumber: number }>('updateBlockNumber')
 export const toggleWalletModal = createAction<void>('toggleWalletModal')
+export const toggleSettingsMenu = createAction<void>('toggleSettingsMenu')
 export const addPopup = createAction<{ key?: string; content: PopupContent }>('addPopup')
 export const removePopup = createAction<{ key: string }>('removePopup')

src/state/application/hooks.ts

 import { useCallback, useMemo } from 'react'
 import { useActiveWeb3React } from '../../hooks'
-import { addPopup, PopupContent, removePopup, toggleWalletModal } from './actions'
+import { addPopup, PopupContent, removePopup, toggleWalletModal, toggleSettingsMenu } from './actions'
 import { useSelector, useDispatch } from 'react-redux'
 import { AppState } from '../index'
 
@@ -19,6 +19,15 @@ export function useWalletModalToggle(): () => void {
   return useCallback(() => dispatch(toggleWalletModal()), [dispatch])
 }
 
+export function useSettingsMenuOpen(): boolean {
+  return useSelector((state: AppState) => state.application.settingsMenuOpen)
+}
+
+export function useToggleSettingsMenu(): () => void {
+  const dispatch = useDispatch()
+  return useCallback(() => dispatch(toggleSettingsMenu()), [dispatch])
+}
+
 // returns a function that allows adding a popup
 export function useAddPopup(): (content: PopupContent, key?: string) => void {
   const dispatch = useDispatch()

src/state/application/reducer.ts

 import { createReducer, nanoid } from '@reduxjs/toolkit'
-import { addPopup, PopupContent, removePopup, toggleWalletModal, updateBlockNumber } from './actions'
+import {
+  addPopup,
+  PopupContent,
+  removePopup,
+  toggleWalletModal,
+  toggleSettingsMenu,
+  updateBlockNumber
+} from './actions'
 
 type PopupList = Array<{ key: string; show: boolean; content: PopupContent }>
 
@@ -7,12 +14,14 @@ interface ApplicationState {
   blockNumber: { [chainId: number]: number }
   popupList: PopupList
   walletModalOpen: boolean
+  settingsMenuOpen: boolean
 }
 
 const initialState: ApplicationState = {
   blockNumber: {},
   popupList: [],
-  walletModalOpen: false
+  walletModalOpen: false,
+  settingsMenuOpen: false
 }
 
 export default createReducer(initialState, builder =>
@@ -28,6 +37,9 @@ export default createReducer(initialState, builder =>
     .addCase(toggleWalletModal, state => {
       state.walletModalOpen = !state.walletModalOpen
     })
+    .addCase(toggleSettingsMenu, state => {
+      state.settingsMenuOpen = !state.settingsMenuOpen
+    })
     .addCase(addPopup, (state, { payload: { content, key } }) => {
       if (key && state.popupList.some(popup => popup.key === key)) return
       state.popupList.push({

src/state/swap/hooks.ts

+import { Version } from './../../hooks/useToggledVersion'
 import { parseUnits } from '@ethersproject/units'
 import { ChainId, JSBI, Token, TokenAmount, Trade, WETH } from '@uniswap/sdk'
 import { ParsedQs } from 'qs'
@@ -13,6 +14,9 @@ import { AppDispatch, AppState } from '../index'
 import { useTokenBalancesTreatWETHAsETH } from '../wallet/hooks'
 import { Field, replaceSwapState, selectToken, switchTokens, typeInput } from './actions'
 import { SwapState } from './reducer'
+import useToggledVersion from '../../hooks/useToggledVersion'
+import { useUserSlippageTolerance } from '../user/hooks'
+import { computeSlippageAdjustedAmounts } from '../../utils/prices'
 
 export function useSwapState(): AppState['swap'] {
   return useSelector<AppState, AppState['swap']>(state => state.swap)
@@ -83,6 +87,8 @@ export function useDerivedSwapInfo(): {
 } {
   const { account } = useActiveWeb3React()
 
+  const toggledVersion = useToggledVersion()
+
   const {
     independentField,
     typedValue,
@@ -132,12 +138,29 @@ export function useDerivedSwapInfo(): {
     error = error ?? 'Select a token'
   }
 
-  // this check is incorrect, it should check against the maximum amount in
-  // rather than the estimated amount in
-  // const [balanceIn, amountIn] = [tokenBalances[Field.INPUT], parsedAmounts[Field.INPUT]]
-  // if (balanceIn && amountIn && balanceIn.lessThan(amountIn)) {
-  //   error = 'Insufficient ' + amountIn.token.symbol + ' balance'
-  // }
+  const [allowedSlippage] = useUserSlippageTolerance()
+
+  const slippageAdjustedAmounts =
+    bestTrade && allowedSlippage && computeSlippageAdjustedAmounts(bestTrade, allowedSlippage)
+
+  const slippageAdjustedAmountsV1 =
+    v1Trade && allowedSlippage && computeSlippageAdjustedAmounts(v1Trade, allowedSlippage)
+
+  // compare input balance to MAx input based on version
+  const [balanceIn, amountIn] = [
+    tokenBalances[Field.INPUT],
+    toggledVersion === Version.v1
+      ? slippageAdjustedAmountsV1
+        ? slippageAdjustedAmountsV1[Field.INPUT]
+        : null
+      : slippageAdjustedAmounts
+      ? slippageAdjustedAmounts[Field.INPUT]
+      : null
+  ]
+
+  if (balanceIn && amountIn && balanceIn.lessThan(amountIn)) {
+    error = 'Insufficient ' + amountIn.token.symbol + ' balance'
+  }
 
   return {
     tokens,

src/state/user/actions.ts

@@ -16,6 +16,11 @@ export interface SerializedPair {
 export const updateVersion = createAction<void>('updateVersion')
 export const updateMatchesDarkMode = createAction<{ matchesDarkMode: boolean }>('updateMatchesDarkMode')
 export const updateUserDarkMode = createAction<{ userDarkMode: boolean }>('updateUserDarkMode')
+export const updateUserExpertMode = createAction<{ userExpertMode: boolean }>('updateUserExpertMode')
+export const updateUserSlippageTolerance = createAction<{ userSlippageTolerance: number }>(
+  'updateUserSlippageTolerance'
+)
+export const updateUserDeadline = createAction<{ userDeadline: number }>('updateUserDeadline')
 export const addSerializedToken = createAction<{ serializedToken: SerializedToken }>('addSerializedToken')
 export const removeSerializedToken = createAction<{ chainId: number; address: string }>('removeSerializedToken')
 export const addSerializedPair = createAction<{ serializedPair: SerializedPair }>('addSerializedPair')

src/state/user/hooks.tsx

@@ -13,7 +13,10 @@ import {
   removeSerializedToken,
   SerializedPair,
   SerializedToken,
-  updateUserDarkMode
+  updateUserDarkMode,
+  updateUserExpertMode,
+  updateUserSlippageTolerance,
+  updateUserDeadline
 } from './actions'
 import { BASES_TO_TRACK_LIQUIDITY_FOR, DUMMY_PAIRS_TO_PIN } from '../../constants'
 
@@ -63,6 +66,54 @@ export function useDarkModeManager(): [boolean, () => void] {
   return [darkMode, toggleSetDarkMode]
 }
 
+export function useIsExpertMode(): boolean {
+  const userExpertMode = useSelector<AppState, AppState['user']['userExpertMode']>(state => state.user.userExpertMode)
+  return userExpertMode
+}
+
+export function useExpertModeManager(): [boolean, () => void] {
+  const dispatch = useDispatch<AppDispatch>()
+  const expertMode = useIsExpertMode()
+
+  const toggleSetExpertMode = useCallback(() => {
+    dispatch(updateUserExpertMode({ userExpertMode: !expertMode }))
+  }, [expertMode, dispatch])
+
+  return [expertMode, toggleSetExpertMode]
+}
+
+export function useUserSlippageTolerance(): [number, (slippage: number) => void] {
+  const dispatch = useDispatch<AppDispatch>()
+  const userSlippageTolerance = useSelector<AppState, AppState['user']['userSlippageTolerance']>(state => {
+    return state.user.userSlippageTolerance
+  })
+
+  const setUserSlippageTolerance = useCallback(
+    (userSlippageTolerance: number) => {
+      dispatch(updateUserSlippageTolerance({ userSlippageTolerance }))
+    },
+    [dispatch]
+  )
+
+  return [userSlippageTolerance, setUserSlippageTolerance]
+}
+
+export function useUserDeadline(): [number, (slippage: number) => void] {
+  const dispatch = useDispatch<AppDispatch>()
+  const userDeadline = useSelector<AppState, AppState['user']['userDeadline']>(state => {
+    return state.user.userDeadline
+  })
+
+  const setUserDeadline = useCallback(
+    (userDeadline: number) => {
+      dispatch(updateUserDeadline({ userDeadline }))
+    },
+    [dispatch]
+  )
+
+  return [userDeadline, setUserDeadline]
+}
+
 export function useAddUserToken(): (token: Token) => void {
   const dispatch = useDispatch<AppDispatch>()
   return useCallback(

src/state/user/reducer.ts

+import { INITIAL_ALLOWED_SLIPPAGE, DEFAULT_DEADLINE_FROM_NOW } from './../../constants/index'
 import { createReducer } from '@reduxjs/toolkit'
-import { ChainId, WETH } from '@uniswap/sdk'
 import {
   addSerializedPair,
   addSerializedToken,
@@ -10,7 +10,10 @@ import {
   SerializedToken,
   updateMatchesDarkMode,
   updateUserDarkMode,
-  updateVersion
+  updateVersion,
+  updateUserExpertMode,
+  updateUserSlippageTolerance,
+  updateUserDeadline
 } from './actions'
 
 const currentTimestamp = () => new Date().getTime()
@@ -21,6 +24,14 @@ interface UserState {
   userDarkMode: boolean | null // the user's choice for dark mode or light mode
   matchesDarkMode: boolean // whether the dark mode media query matches
 
+  userExpertMode: boolean
+
+  // user defined slippage tolerance in bips, used in all txns
+  userSlippageTolerance: number
+
+  // deadline set by user in minutes, used in all txns
+  userDeadline: number
+
   tokens: {
     [chainId: number]: {
       [address: string]: SerializedToken
@@ -50,13 +61,13 @@ function pairKey(token0Address: string, token1Address: string) {
 
 const initialState: UserState = {
   lastVersion: '',
-
   userDarkMode: null,
   matchesDarkMode: false,
-
+  userExpertMode: false,
+  userSlippageTolerance: INITIAL_ALLOWED_SLIPPAGE,
+  userDeadline: DEFAULT_DEADLINE_FROM_NOW,
   tokens: {},
   pairs: {},
-
   timestamp: currentTimestamp()
 }
 
@@ -68,12 +79,14 @@ export default createReducer(initialState, builder =>
       if (GIT_COMMIT_HASH && state.lastVersion !== GIT_COMMIT_HASH) {
         state.lastVersion = GIT_COMMIT_HASH
 
-        // Wed May 20, 2020 @ ~9pm central
-        if (state.timestamp < 1590027589111) {
-          // this should remove the user added token from 'eth' for mainnet
-          if (state.tokens[ChainId.MAINNET]) {
-            delete state.tokens[ChainId.MAINNET][WETH[ChainId.MAINNET].address]
-          }
+        // slippage isnt being tracked in local storage, reset to default
+        if (typeof state.userSlippageTolerance !== 'number') {
+          state.userSlippageTolerance = INITIAL_ALLOWED_SLIPPAGE
+        }
+
+        // deadline isnt being tracked in local storage, reset to default
+        if (typeof state.userDeadline !== 'number') {
+          state.userDeadline = DEFAULT_DEADLINE_FROM_NOW
         }
       }
       state.timestamp = currentTimestamp()
@@ -86,6 +99,18 @@ export default createReducer(initialState, builder =>
       state.matchesDarkMode = action.payload.matchesDarkMode
       state.timestamp = currentTimestamp()
     })
+    .addCase(updateUserExpertMode, (state, action) => {
+      state.userExpertMode = action.payload.userExpertMode
+      state.timestamp = currentTimestamp()
+    })
+    .addCase(updateUserSlippageTolerance, (state, action) => {
+      state.userSlippageTolerance = action.payload.userSlippageTolerance
+      state.timestamp = currentTimestamp()
+    })
+    .addCase(updateUserDeadline, (state, action) => {
+      state.userDeadline = action.payload.userDeadline
+      state.timestamp = currentTimestamp()
+    })
     .addCase(addSerializedToken, (state, { payload: { serializedToken } }) => {
       state.tokens[serializedToken.chainId] = state.tokens[serializedToken.chainId] || {}
       state.tokens[serializedToken.chainId][serializedToken.address] = serializedToken

src/utils/prices.ts

+import { BLOCKED_PRICE_IMPACT_NON_EXPERT } from './../constants/index'
 import { Fraction, JSBI, Percent, TokenAmount, Trade } from '@uniswap/sdk'
 import { ALLOWED_PRICE_IMPACT_HIGH, ALLOWED_PRICE_IMPACT_LOW, ALLOWED_PRICE_IMPACT_MEDIUM } from '../constants'
 import { Field } from '../state/swap/actions'
@@ -51,7 +52,8 @@ export function computeSlippageAdjustedAmounts(
   }
 }
 
-export function warningSeverity(priceImpact: Percent): 0 | 1 | 2 | 3 {
+export function warningSeverity(priceImpact: Percent): 0 | 1 | 2 | 3 | 4 {
+  if (!priceImpact?.lessThan(BLOCKED_PRICE_IMPACT_NON_EXPERT)) return 4
   if (!priceImpact?.lessThan(ALLOWED_PRICE_IMPACT_HIGH)) return 3
   if (!priceImpact?.lessThan(ALLOWED_PRICE_IMPACT_MEDIUM)) return 2
   if (!priceImpact?.lessThan(ALLOWED_PRICE_IMPACT_LOW)) return 1