import { Trans } from '@lingui/macro'
import { Trace, TraceEvent } from '@uniswap/analytics'
import { BrowserEvent, InterfaceElementName, InterfacePageName, SharedEventName } from '@uniswap/analytics-events'
import { AboutFooter } from 'components/About/AboutFooter'
import Card, { CardType } from 'components/About/Card'
import { MAIN_CARDS, MORE_CARDS } from 'components/About/constants'
import ProtocolBanner from 'components/About/ProtocolBanner'
import { useAccountDrawer } from 'components/AccountDrawer'
import { BaseButton } from 'components/Button'
import { AppleLogo } from 'components/Logo/AppleLogo'
import { useDisableNFTRoutes } from 'hooks/useDisableNFTRoutes'
import Swap from 'pages/Swap'
import { parse } from 'qs'
import { useEffect, useMemo, useRef, useState } from 'react'
import { ArrowDownCircle } from 'react-feather'
import { useLocation, useNavigate } from 'react-router-dom'
import { Link as NativeLink } from 'react-router-dom'
import { useAppSelector } from 'state/hooks'
import styled, { css } from 'styled-components/macro'
import { BREAKPOINTS } from 'theme'
import { useIsDarkMode } from 'theme/components/ThemeToggle'
import { TRANSITION_DURATIONS } from 'theme/styles'
import { Z_INDEX } from 'theme/zIndex'

const PageContainer = styled.div`
  position: absolute;
  top: 0;
  padding: ${({ theme }) => theme.navHeight}px 0px 0px 0px;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  scroll-behavior: smooth;
  overflow-x: hidden;
`

const Gradient = styled.div<{ isDarkMode: boolean }>`
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  top: 0;
  bottom: 0;
  width: 100%;
  min-height: 550px;
  ${({ isDarkMode }) =>
    isDarkMode
      ? css`
          background: linear-gradient(rgba(8, 10, 24, 0) 0%, rgb(8 10 24 / 100%) 45%);
        `
      : css`
          background: linear-gradient(rgba(255, 255, 255, 0) 0%, rgb(255 255 255 /100%) 45%);
        `};
  z-index: ${Z_INDEX.under_dropdown};
  pointer-events: none;
  height: ${({ theme }) => `calc(100vh - ${theme.mobileBottomBarHeight}px)`};
  @media screen and (min-width: ${({ theme }) => theme.breakpoint.md}px) {
    height: 100vh;
  }
`

const GlowContainer = styled.div`
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  top: 0;
  bottom: 0;
  width: 100%;
  overflow-y: hidden;
  height: ${({ theme }) => `calc(100vh - ${theme.mobileBottomBarHeight}px)`};
  @media screen and (min-width: ${({ theme }) => theme.breakpoint.md}px) {
    height: 100vh;
  }
`

const Glow = styled.div`
  position: absolute;
  top: 68px;
  bottom: 0;
  background: radial-gradient(72.04% 72.04% at 50% 3.99%, #ff37eb 0%, rgba(166, 151, 255, 0) 100%);
  filter: blur(72px);
  border-radius: 24px;
  max-width: 480px;
  width: 100%;
  height: 100%;
`

const ContentContainer = styled.div<{ isDarkMode: boolean }>`
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  width: 100%;
  padding: 0 0 40px;
  max-width: min(720px, 90%);
  min-height: 500px;
  z-index: ${Z_INDEX.under_dropdown};
  transition: ${({ theme }) => `${theme.transition.duration.medium} ${theme.transition.timing.ease} opacity`};
  height: ${({ theme }) => `calc(100vh - ${theme.navHeight + theme.mobileBottomBarHeight}px)`};
  pointer-events: none;
  * {
    pointer-events: auto;
  }
`

const TitleText = styled.h1<{ isDarkMode: boolean }>`
  color: transparent;
  font-size: 36px;
  line-height: 44px;
  font-weight: 700;
  text-align: center;
  margin: 0 0 24px;
  ${({ isDarkMode }) =>
    isDarkMode
      ? css`
          background: linear-gradient(20deg, rgba(255, 244, 207, 1) 10%, rgba(255, 87, 218, 1) 100%);
        `
      : css`
          background: linear-gradient(10deg, rgba(255, 79, 184, 1) 0%, rgba(255, 159, 251, 1) 100%);
        `};
  background-clip: text;
  -webkit-background-clip: text;

  @media screen and (min-width: ${BREAKPOINTS.sm}px) {
    font-size: 48px;
    line-height: 56px;
  }

  @media screen and (min-width: ${BREAKPOINTS.md}px) {
    font-size: 64px;
    line-height: 72px;
  }
`

const SubText = styled.div`
  color: ${({ theme }) => theme.textSecondary};
  font-size: 16px;
  line-height: 24px;
  font-weight: 500;
  text-align: center;
  max-width: 600px;
  margin: 0 0 32px;

  @media screen and (min-width: ${BREAKPOINTS.md}px) {
    font-size: 20px;
    line-height: 28px;
  }
`

const SubTextContainer = styled.div`
  display: flex;
  justify-content: center;
`

const LandingButton = styled(BaseButton)`
  padding: 16px 0px;
  border-radius: 24px;
`

const ButtonCTA = styled(LandingButton)`
  background: linear-gradient(93.06deg, #ff00c7 2.66%, #ff9ffb 98.99%);
  border: none;
  color: ${({ theme }) => theme.white};
  transition: ${({ theme }) => `all ${theme.transition.duration.medium} ${theme.transition.timing.ease}`};

  &:hover {
    box-shadow: 0px 0px 16px 0px #ff00c7;
  }
`

const ButtonCTAText = styled.p`
  margin: 0px;
  font-size: 16px;
  font-weight: 600;
  white-space: nowrap;

  @media screen and (min-width: ${BREAKPOINTS.sm}px) {
    font-size: 20px;
  }
`

const ActionsContainer = styled.span`
  max-width: 300px;
  width: 100%;
  pointer-events: auto;
`

const LearnMoreContainer = styled.div`
  align-items: center;
  color: ${({ theme }) => theme.textTertiary};
  cursor: pointer;
  font-size: 20px;
  font-weight: 600;
  margin: 36px 0;
  display: flex;
  visibility: hidden;
  pointer-events: auto;
  @media screen and (min-width: ${BREAKPOINTS.sm}px) {
    visibility: visible;
  }

  transition: ${({ theme }) => `${theme.transition.duration.medium} ${theme.transition.timing.ease} opacity`};

  &:hover {
    opacity: 0.6;
  }
`

const LearnMoreArrow = styled(ArrowDownCircle)`
  margin-left: 14px;
  size: 20px;
`

const AboutContentContainer = styled.div<{ isDarkMode: boolean }>`
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 24px 5rem;
  width: 100%;
  ${({ isDarkMode }) =>
    isDarkMode
      ? css`
          background: linear-gradient(179.82deg, rgba(0, 0, 0, 0) 0.16%, #050026 99.85%);
        `
      : css`
          background: linear-gradient(179.82deg, rgba(255, 255, 255, 0) 0.16%, #eaeaea 99.85%);
        `};
  @media screen and (min-width: ${BREAKPOINTS.md}px) {
    padding: 0 96px 5rem;
  }
`

const CardGrid = styled.div<{ cols: number }>`
  display: grid;
  gap: 12px;
  width: 100%;
  padding: 24px 0 0;
  max-width: 1440px;
  scroll-margin: ${({ theme }) => `${theme.navHeight}px 0 0`};

  grid-template-columns: 1fr;
  @media screen and (min-width: ${BREAKPOINTS.sm}px) {
    // At this screen size, we show up to 2 columns.
    grid-template-columns: ${({ cols }) =>
      Array.from(Array(cols === 2 ? 2 : 1))
        .map(() => '1fr')
        .join(' ')};
    gap: 32px;
  }

  @media screen and (min-width: ${BREAKPOINTS.lg}px) {
    // at this screen size, always show the max number of columns
    grid-template-columns: ${({ cols }) =>
      Array.from(Array(cols))
        .map(() => '1fr')
        .join(' ')};
    gap: 32px;
  }
`

const LandingSwapContainer = styled.div`
  height: ${({ theme }) => `calc(100vh - ${theme.mobileBottomBarHeight}px)`};
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  z-index: 1;
`

const SwapCss = css`
  * {
    pointer-events: none;
  }

  &:hover {
    transform: translateY(-4px);
    transition: ${({ theme }) => `transform ${theme.transition.duration.medium} ${theme.transition.timing.ease}`};
  }
`

const LinkCss = css`
  text-decoration: none;
  max-width: 480px;
  width: 100%;
`

const LandingSwap = styled(Swap)`
  ${SwapCss}
  &:hover {
    border: 1px solid ${({ theme }) => theme.accentAction};
  }
`

const Link = styled(NativeLink)`
  ${LinkCss}
`

export default function Landing() {
  const isDarkMode = useIsDarkMode()

  const cardsRef = useRef<HTMLDivElement>(null)

  const [showContent, setShowContent] = useState(false)
  const selectedWallet = useAppSelector((state) => state.user.selectedWallet)
  const navigate = useNavigate()
  const location = useLocation()
  const queryParams = parse(location.search, {
    ignoreQueryPrefix: true,
  })

  const [accountDrawerOpen] = useAccountDrawer()
  useEffect(() => {
    if ((queryParams.intro || !selectedWallet) && !accountDrawerOpen) {
      setShowContent(true)
    } else {
      setShowContent(false)
      setTimeout(() => {
        navigate('/swap')
      }, TRANSITION_DURATIONS.medium)
    }
  }, [navigate, selectedWallet, queryParams.intro, accountDrawerOpen])

  const shouldDisableNFTRoutes = useDisableNFTRoutes()

  const cards = useMemo(
    () => MAIN_CARDS.filter((card) => !(shouldDisableNFTRoutes && card.to.startsWith('/nft'))),
    [shouldDisableNFTRoutes]
  )

  return (
    <Trace page={InterfacePageName.LANDING_PAGE} shouldLogImpression>
      <PageContainer data-testid="landing-page">
        <LandingSwapContainer>
          <TraceEvent
            events={[BrowserEvent.onClick]}
            name={SharedEventName.ELEMENT_CLICKED}
            element={InterfaceElementName.LANDING_PAGE_SWAP_ELEMENT}
          >
            <Link to="/swap">
              <LandingSwap />
            </Link>
          </TraceEvent>
        </LandingSwapContainer>
        {showContent && (
          <>
            <Gradient isDarkMode={isDarkMode} />
            <GlowContainer>
              <Glow />
            </GlowContainer>
            <ContentContainer isDarkMode={isDarkMode}>
              <TitleText isDarkMode={isDarkMode}>
                {shouldDisableNFTRoutes ? (
                  <Trans>Trade crypto with confidence</Trans>
                ) : (
                  <Trans>Trade crypto and NFTs with confidence</Trans>
                )}
              </TitleText>
              <SubTextContainer>
                <SubText>
                  {shouldDisableNFTRoutes ? (
                    <Trans>Buy, sell, and explore tokens</Trans>
                  ) : (
                    <Trans>Buy, sell, and explore tokens and NFTs</Trans>
                  )}
                </SubText>
              </SubTextContainer>
              <ActionsContainer>
                <TraceEvent
                  events={[BrowserEvent.onClick]}
                  name={SharedEventName.ELEMENT_CLICKED}
                  element={InterfaceElementName.CONTINUE_BUTTON}
                >
                  <ButtonCTA as={Link} to="/swap">
                    <ButtonCTAText>
                      <Trans>Get started</Trans>
                    </ButtonCTAText>
                  </ButtonCTA>
                </TraceEvent>
              </ActionsContainer>
              <LearnMoreContainer
                onClick={() => {
                  cardsRef?.current?.scrollIntoView({ behavior: 'smooth' })
                }}
              >
                <Trans>Learn more</Trans>
                <LearnMoreArrow />
              </LearnMoreContainer>

              <DownloadWalletLink href="https://wallet.uniswap.org/">
                <AppleLogo width="20" height="20" />
                Download the Uniswap Wallet for iOS
              </DownloadWalletLink>
            </ContentContainer>
            <AboutContentContainer isDarkMode={isDarkMode}>
              <CardGrid cols={cards.length} ref={cardsRef}>
                {cards.map(({ darkBackgroundImgSrc, lightBackgroundImgSrc, ...card }) => (
                  <Card
                    {...card}
                    backgroundImgSrc={isDarkMode ? darkBackgroundImgSrc : lightBackgroundImgSrc}
                    key={card.title}
                  />
                ))}
              </CardGrid>
              <CardGrid cols={3}>
                {MORE_CARDS.map(({ darkIcon, lightIcon, ...card }) => (
                  <Card {...card} icon={isDarkMode ? darkIcon : lightIcon} key={card.title} type={CardType.Secondary} />
                ))}
              </CardGrid>
              <ProtocolBanner />
              <AboutFooter />
            </AboutContentContainer>
          </>
        )}
      </PageContainer>
    </Trace>
  )
}

const DownloadWalletLink = styled.a`
  display: inline-flex;
  gap: 8px;
  color: ${({ theme }) => theme.textSecondary};
  text-decoration: none;
  font-size: 16px;
  line-height: 24px;
  font-weight: 500;
  text-align: center;

  :hover {
    color: ${({ theme }) => theme.textTertiary};
  }
`
