import { InterfacePageName } from '@uniswap/analytics-events'
import { Pair } from '@uniswap/v2-sdk'
import { V2Unsupported } from 'components/V2Unsupported'
import { useAccount } from 'hooks/useAccount'
import { useNetworkSupportsV2 } from 'hooks/useNetworkSupportsV2'
import { useTokenBalances } from 'hooks/useTokenBalances'
import { Trans } from 'i18n'
import JSBI from 'jsbi'
import { PoolVersionMenu } from 'pages/Pool/shared'
import { useMemo } from 'react'
import { ChevronsRight } from 'react-feather'
import { Link } from 'react-router-dom'
import { Text } from 'rebass'
import styled, { useTheme } from 'styled-components'
import { ExternalLink, HideSmall, ThemedText } from 'theme/components'
import { ProtocolVersion } from 'uniswap/src/data/graphql/uniswap-data-api/__generated__/types-and-hooks'
import Trace from 'uniswap/src/features/telemetry/Trace'
import { currencyKey } from 'utils/currencyKey'
import { ButtonOutlined, ButtonPrimary, ButtonSecondary } from '../../components/Button'
import Card from '../../components/Card'
import { AutoColumn } from '../../components/Column'
import FullPositionCard from '../../components/PositionCard'
import Row, { RowBetween, RowFixed } from '../../components/Row'
import { SwitchLocaleLink } from '../../components/SwitchLocaleLink'
import { CardBGImage, CardNoise, CardSection, DataCard } from '../../components/earn/styled'
import { Dots } from '../../components/swap/styled'
import { BIG_INT_ZERO } from '../../constants/misc'
import { useV2Pairs } from '../../hooks/useV2Pairs'
import { useStakingInfo } from '../../state/stake/hooks'
import { toV2LiquidityToken, useTrackedTokenPairs } from '../../state/user/hooks'

const PageWrapper = styled(AutoColumn)`
  max-width: 640px;
  width: 100%;

  ${({ theme }) => theme.deprecated_mediaWidth.deprecated_upToSmall`
    padding: 0px 8px;
  `};
`

const LPFeeExplainer = styled(DataCard)`
  background: radial-gradient(76.02% 75.41% at 1.84% 0%, #27ae60 0%, #000000 100%);
  margin: 0 0 16px 0;
  overflow: hidden;
`

const ButtonRow = styled(RowFixed)`
  gap: 8px;
  ${({ theme }) => theme.deprecated_mediaWidth.deprecated_upToSmall`
    width: 100%;
    flex-direction: row-reverse;
    justify-content: space-between;
  `};
`

const ResponsiveButtonPrimary = styled(ButtonPrimary)`
  height: 40px;
  width: fit-content;
  border-radius: 12px;
  ${({ theme }) => theme.deprecated_mediaWidth.deprecated_upToSmall`
    width: 48%;
  `};
`

const ResponsiveButtonSecondary = styled(ButtonSecondary)`
  height: 40px;
  width: fit-content;
  ${({ theme }) => theme.deprecated_mediaWidth.deprecated_upToSmall`
    width: 48%;
  `};
`

const EmptyProposals = styled.div`
  border: 1px solid ${({ theme }) => theme.neutral2};
  padding: 16px 12px;
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
`

const Header = styled(ThemedText.H1Small)`
  margin-top: 8px;
  justify-self: flex-start;
  font-weight: 535;
`

export default function Pool() {
  const theme = useTheme()
  const account = useAccount()
  const networkSupportsV2 = useNetworkSupportsV2()

  // fetch the user's balances of all tracked V2 LP tokens
  let trackedTokenPairs = useTrackedTokenPairs()
  if (!networkSupportsV2) {
    trackedTokenPairs = []
  }
  const tokenPairsWithLiquidityTokens = useMemo(
    () => trackedTokenPairs.map((tokens) => ({ liquidityToken: toV2LiquidityToken(tokens), tokens })),
    [trackedTokenPairs]
  )
  const { balanceMap, loading: fetchingV2PairBalances } = useTokenBalances()

  // fetch the reserves for all V2 pools in which the user has a balance
  const liquidityTokensWithBalances = useMemo(
    () =>
      tokenPairsWithLiquidityTokens.filter(({ liquidityToken }) => {
        const liquidityTokenKey = currencyKey(liquidityToken)
        return balanceMap[liquidityTokenKey]?.balance > 0
      }),
    [tokenPairsWithLiquidityTokens, balanceMap]
  )

  const v2Pairs = useV2Pairs(liquidityTokensWithBalances.map(({ tokens }) => tokens))
  const v2IsLoading =
    fetchingV2PairBalances || v2Pairs?.length < liquidityTokensWithBalances.length || v2Pairs?.some((V2Pair) => !V2Pair)

  const allV2PairsWithLiquidity = v2Pairs.map(([, pair]) => pair).filter((v2Pair): v2Pair is Pair => Boolean(v2Pair))

  // show liquidity even if its deposited in rewards contract
  const stakingInfo = useStakingInfo()
  const stakingInfosWithBalance = stakingInfo?.filter((pool) =>
    JSBI.greaterThan(pool.stakedAmount.quotient, BIG_INT_ZERO)
  )
  const stakingPairs = useV2Pairs(stakingInfosWithBalance?.map((stakingInfo) => stakingInfo.tokens))

  // remove any pairs that also are included in pairs with stake in mining pool
  const v2PairsWithoutStakedAmount = allV2PairsWithLiquidity.filter((v2Pair) => {
    return (
      stakingPairs
        ?.map((stakingPair) => stakingPair[1])
        .filter((stakingPair) => stakingPair?.liquidityToken.address === v2Pair.liquidityToken.address).length === 0
    )
  })

  return (
    <Trace logImpression page={InterfacePageName.POOL_PAGE}>
      <>
        <PageWrapper>
          <LPFeeExplainer>
            <CardBGImage />
            <CardNoise />
            <CardSection>
              <AutoColumn gap="md">
                <RowBetween>
                  <ThemedText.DeprecatedWhite fontWeight={535}>
                    <Trans i18nKey="pool.liquidity.rewards" />
                  </ThemedText.DeprecatedWhite>
                </RowBetween>
                <RowBetween>
                  <ThemedText.DeprecatedWhite fontSize={14}>
                    <Trans i18nKey="pool.liquidity.earn.fee" />
                  </ThemedText.DeprecatedWhite>
                </RowBetween>
                <ExternalLink
                  style={{ color: theme.white, textDecoration: 'underline' }}
                  target="_blank"
                  href="https://docs.uniswap.org/contracts/v2/concepts/core-concepts/pools"
                >
                  <ThemedText.DeprecatedWhite fontSize={14}>
                    <Trans i18nKey="pool.learnAbout" />
                  </ThemedText.DeprecatedWhite>
                </ExternalLink>
              </AutoColumn>
            </CardSection>
            <CardBGImage />
            <CardNoise />
          </LPFeeExplainer>

          {!networkSupportsV2 ? (
            <V2Unsupported />
          ) : (
            <AutoColumn gap="lg" justify="center">
              <AutoColumn gap="md" style={{ width: '100%' }}>
                <Row gap="md" justify="space-between" style={{ marginTop: '1rem' }} padding="0">
                  <Row gap="md" width="content">
                    <HideSmall>
                      <Header>
                        <Trans i18nKey="pool.yourv2" />
                      </Header>
                    </HideSmall>
                    <PoolVersionMenu protocolVersion={ProtocolVersion.V2} />
                  </Row>
                  <ButtonRow>
                    <ResponsiveButtonSecondary as={Link} padding="6px 8px" to="/add/v2/ETH">
                      <Trans i18nKey="pool.create.pair" />
                    </ResponsiveButtonSecondary>
                    <ResponsiveButtonPrimary id="find-pool-button" as={Link} to="/pools/v2/find" padding="6px 8px">
                      <Text fontWeight={535} fontSize={16}>
                        <Trans i18nKey="pool.import" />
                      </Text>
                    </ResponsiveButtonPrimary>
                    <ResponsiveButtonPrimary id="join-pool-button" as={Link} to="/add/v2/ETH" padding="6px 8px">
                      <Text fontWeight={535} fontSize={16}>
                        <Trans i18nKey="pool.v2.add" />
                      </Text>
                    </ResponsiveButtonPrimary>
                  </ButtonRow>
                </Row>

                {!account ? (
                  <Card padding="40px">
                    <ThemedText.DeprecatedBody color={theme.neutral3} textAlign="center">
                      <Trans i18nKey="pool.liquidity.connectToAdd" />
                    </ThemedText.DeprecatedBody>
                  </Card>
                ) : v2IsLoading ? (
                  <EmptyProposals>
                    <ThemedText.DeprecatedBody color={theme.neutral3} textAlign="center">
                      <Dots>
                        <Trans i18nKey="common.loading" />
                      </Dots>
                    </ThemedText.DeprecatedBody>
                  </EmptyProposals>
                ) : allV2PairsWithLiquidity?.length > 0 || stakingPairs?.length > 0 ? (
                  <>
                    <ButtonSecondary>
                      <RowBetween>
                        <ExternalLink href={'https://v2.info.uniswap.org/account/' + account}>
                          <Trans i18nKey="pool.account.analyticsFees" />
                        </ExternalLink>
                        <span> ↗ </span>
                      </RowBetween>
                    </ButtonSecondary>
                    {v2PairsWithoutStakedAmount.map((v2Pair) => (
                      <FullPositionCard key={v2Pair.liquidityToken.address} pair={v2Pair} />
                    ))}
                    {stakingPairs.map(
                      (stakingPair, i) =>
                        stakingPair[1] && ( // skip pairs that arent loaded
                          <FullPositionCard
                            key={stakingInfosWithBalance[i].stakingRewardAddress}
                            pair={stakingPair[1]}
                            stakedBalance={stakingInfosWithBalance[i].stakedAmount}
                          />
                        )
                    )}
                    <RowFixed justify="center" style={{ width: '100%' }}>
                      <ButtonOutlined
                        as={Link}
                        to="/migrate/v2"
                        id="import-pool-link"
                        style={{
                          padding: '8px 16px',
                          margin: '0 4px',
                          borderRadius: '12px',
                          width: 'fit-content',
                          fontSize: '14px',
                        }}
                      >
                        <ChevronsRight size={16} style={{ marginRight: '8px' }} />
                        <Trans i18nKey="pool.v2.migratev3" />
                      </ButtonOutlined>
                    </RowFixed>
                  </>
                ) : (
                  <EmptyProposals>
                    <ThemedText.DeprecatedBody color={theme.neutral3} textAlign="center">
                      <Trans i18nKey="pool.noLiquidity" />
                    </ThemedText.DeprecatedBody>
                  </EmptyProposals>
                )}
              </AutoColumn>
            </AutoColumn>
          )}
        </PageWrapper>
        <SwitchLocaleLink />
      </>
    </Trace>
  )
}
