'use client'

import { Fragment, useEffect, useId, useRef, useState } from 'react'
import { Tab, TabGroup, TabList, TabPanel, TabPanels } from '@headlessui/react'
import clsx from 'clsx'
import {
  type MotionProps,
  type Variant,
  type Variants,
  AnimatePresence,
  motion,
} from 'framer-motion'
import { useDebouncedCallback } from 'use-debounce'

import { AppScreen } from '@/components/AppScreen'
import { CircleBackground } from '@/components/CircleBackground'
import { Container } from '@/components/Container'
import { PhoneFrame } from '@/components/PhoneFrame'
import {
  DiageoLogo,
  LaravelLogo,
  MirageLogo,
  ReversableLogo,
  StatamicLogo,
  StaticKitLogo,
  TransistorLogo,
  TupleLogo,
} from '@/components/StockLogos'

const MotionAppScreenHeader = motion(AppScreen.Header)
const MotionAppScreenBody = motion(AppScreen.Body)

interface CustomAnimationProps {
  isForwards: boolean
  changeCount: number
}

const features = [
  {
    name: 'Invite friends for better returns',
    description:
      'For every friend you invite to EngageOS, you get insider notifications 5 seconds sooner. And it’s 10 seconds if you invite an insider.',
    icon: DeviceUserIcon,
    screen: InviteScreen,
  },
  {
    name: 'Notifications on stock dips',
    description:
      'Get a push notification every time we find out something that’s going to lower the share price on your holdings so you can sell before the information hits the public markets.',
    icon: DeviceNotificationIcon,
    screen: StocksScreen,
  },
  {
    name: 'Invest what you want',
    description:
      'We hide your stock purchases behind thousands of anonymous trading accounts, so suspicious activity can never be traced back to you.',
    icon: DeviceTouchIcon,
    screen: InvestScreen,
  },
]

function DeviceUserIcon(props: React.ComponentPropsWithoutRef<'svg'>) {
  return (
    <svg viewBox="0 0 32 32" aria-hidden="true" {...props}>
      <circle cx={16} cy={16} r={16} fill="#A3A3A3" fillOpacity={0.2} />
      <path
        fillRule="evenodd"
        clipRule="evenodd"
        d="M16 23a3 3 0 100-6 3 3 0 000 6zm-1 2a4 4 0 00-4 4v1a2 2 0 002 2h6a2 2 0 002-2v-1a4 4 0 00-4-4h-2z"
        fill="#737373"
      />
      <path
        fillRule="evenodd"
        clipRule="evenodd"
        d="M5 4a4 4 0 014-4h14a4 4 0 014 4v24a4.002 4.002 0 01-3.01 3.877c-.535.136-.99-.325-.99-.877s.474-.98.959-1.244A2 2 0 0025 28V4a2 2 0 00-2-2h-1.382a1 1 0 00-.894.553l-.448.894a1 1 0 01-.894.553h-6.764a1 1 0 01-.894-.553l-.448-.894A1 1 0 0010.382 2H9a2 2 0 00-2 2v24a2 2 0 001.041 1.756C8.525 30.02 9 30.448 9 31s-.455 1.013-.99.877A4.002 4.002 0 015 28V4z"
        fill="#A3A3A3"
      />
    </svg>
  )
}

function DeviceNotificationIcon(props: React.ComponentPropsWithoutRef<'svg'>) {
  return (
    <svg viewBox="0 0 32 32" aria-hidden="true" {...props}>
      <circle cx={16} cy={16} r={16} fill="#A3A3A3" fillOpacity={0.2} />
      <path
        fillRule="evenodd"
        clipRule="evenodd"
        d="M9 0a4 4 0 00-4 4v24a4 4 0 004 4h14a4 4 0 004-4V4a4 4 0 00-4-4H9zm0 2a2 2 0 00-2 2v24a2 2 0 002 2h14a2 2 0 002-2V4a2 2 0 00-2-2h-1.382a1 1 0 00-.894.553l-.448.894a1 1 0 01-.894.553h-6.764a1 1 0 01-.894-.553l-.448-.894A1 1 0 0010.382 2H9z"
        fill="#A3A3A3"
      />
      <path
        d="M9 8a2 2 0 012-2h10a2 2 0 012 2v2a2 2 0 01-2 2H11a2 2 0 01-2-2V8z"
        fill="#737373"
      />
    </svg>
  )
}

function DeviceTouchIcon(props: React.ComponentPropsWithoutRef<'svg'>) {
  let id = useId()

  return (
    <svg viewBox="0 0 32 32" fill="none" aria-hidden="true" {...props}>
      <defs>
        <linearGradient
          id={`${id}-gradient`}
          x1={14}
          y1={14.5}
          x2={7}
          y2={17}
          gradientUnits="userSpaceOnUse"
        >
          <stop stopColor="#737373" />
          <stop offset={1} stopColor="#D4D4D4" stopOpacity={0} />
        </linearGradient>
      </defs>
      <circle cx={16} cy={16} r={16} fill="#A3A3A3" fillOpacity={0.2} />
      <path
        fillRule="evenodd"
        clipRule="evenodd"
        d="M5 4a4 4 0 014-4h14a4 4 0 014 4v13h-2V4a2 2 0 00-2-2h-1.382a1 1 0 00-.894.553l-.448.894a1 1 0 01-.894.553h-6.764a1 1 0 01-.894-.553l-.448-.894A1 1 0 0010.382 2H9a2 2 0 00-2 2v24a2 2 0 002 2h4v2H9a4 4 0 01-4-4V4z"
        fill="#A3A3A3"
      />
      <path
        d="M7 22c0-4.694 3.5-8 8-8"
        stroke={`url(#${id}-gradient)`}
        strokeWidth={2}
        strokeLinecap="round"
        strokeLinejoin="round"
      />
      <path
        d="M21 20l.217-5.513a1.431 1.431 0 00-2.85-.226L17.5 21.5l-1.51-1.51a2.107 2.107 0 00-2.98 0 .024.024 0 00-.005.024l3.083 9.25A4 4 0 0019.883 32H25a4 4 0 004-4v-5a3 3 0 00-3-3h-5z"
        fill="#A3A3A3"
      />
    </svg>
  )
}

const headerAnimation: Variants = {
  initial: { opacity: 0, transition: { duration: 0.3 } },
  animate: { opacity: 1, transition: { duration: 0.3, delay: 0.3 } },
  exit: { opacity: 0, transition: { duration: 0.3 } },
}

const maxZIndex = 2147483647

const bodyVariantBackwards: Variant = {
  opacity: 0.4,
  scale: 0.8,
  zIndex: 0,
  filter: 'blur(4px)',
  transition: { duration: 0.4 },
}

const bodyVariantForwards: Variant = (custom: CustomAnimationProps) => ({
  y: '100%',
  zIndex: maxZIndex - custom.changeCount,
  transition: { duration: 0.4 },
})

const bodyAnimation: MotionProps = {
  initial: 'initial',
  animate: 'animate',
  exit: 'exit',
  variants: {
    initial: (custom: CustomAnimationProps, ...props) =>
      custom.isForwards
        ? bodyVariantForwards(custom, ...props)
        : bodyVariantBackwards,
    animate: (custom: CustomAnimationProps) => ({
      y: '0%',
      opacity: 1,
      scale: 1,
      zIndex: maxZIndex / 2 - custom.changeCount,
      filter: 'blur(0px)',
      transition: { duration: 0.4 },
    }),
    exit: (custom: CustomAnimationProps, ...props) =>
      custom.isForwards
        ? bodyVariantBackwards
        : bodyVariantForwards(custom, ...props),
  },
}

type ScreenProps =
  | {
      animated: true
      custom: CustomAnimationProps
    }
  | { animated?: false }

function InviteScreen(props: ScreenProps) {
  return (
    <AppScreen className="w-full">
      <MotionAppScreenHeader {...(props.animated ? headerAnimation : {})}>
        <AppScreen.Title>Invite people</AppScreen.Title>
        <AppScreen.Subtitle>
          Get tips <span className="text-white">5s sooner</span> for every
          invite.
        </AppScreen.Subtitle>
      </MotionAppScreenHeader>
      <MotionAppScreenBody
        {...(props.animated ? { ...bodyAnimation, custom: props.custom } : {})}
      >
        <div className="px-4 py-6">
          <div className="space-y-6">
            {[
              { label: 'Full name', value: 'Albert H. Wiggin' },
              { label: 'Email address', value: 'awiggin@chase.com' },
            ].map((field) => (
              <div key={field.label}>
                <div className="text-sm text-gray-500">{field.label}</div>
                <div className="mt-2 border-b border-gray-200 pb-2 text-sm text-gray-900">
                  {field.value}
                </div>
              </div>
            ))}
          </div>
          <div className="mt-6 rounded-lg bg-cyan-500 px-3 py-2 text-center text-sm font-semibold text-white">
            Invite person
          </div>
        </div>
      </MotionAppScreenBody>
    </AppScreen>
  )
}

function StocksScreen(props: ScreenProps) {
  return (
    <AppScreen className="w-full">
      <MotionAppScreenHeader {...(props.animated ? headerAnimation : {})}>
        <AppScreen.Title>Stocks</AppScreen.Title>
        <AppScreen.Subtitle>March 9, 2022</AppScreen.Subtitle>
      </MotionAppScreenHeader>
      <MotionAppScreenBody
        {...(props.animated ? { ...bodyAnimation, custom: props.custom } : {})}
      >
        <div className="divide-y divide-gray-100">
          {[
            {
              name: 'Laravel',
              price: '4,098.01',
              change: '+4.98%',
              color: '#F9322C',
              logo: LaravelLogo,
            },
            {
              name: 'Tuple',
              price: '5,451.10',
              change: '-3.38%',
              color: '#5A67D8',
              logo: TupleLogo,
            },
            {
              name: 'Transistor',
              price: '4,098.41',
              change: '+6.25%',
              color: '#2A5B94',
              logo: TransistorLogo,
            },
            {
              name: 'Diageo',
              price: '250.65',
              change: '+1.25%',
              color: '#3320A7',
              logo: DiageoLogo,
            },
            {
              name: 'StaticKit',
              price: '250.65',
              change: '-3.38%',
              color: '#2A3034',
              logo: StaticKitLogo,
            },
            {
              name: 'Statamic',
              price: '5,040.85',
              change: '-3.11%',
              color: '#0EA5E9',
              logo: StatamicLogo,
            },
            {
              name: 'Mirage',
              price: '140.44',
              change: '+9.09%',
              color: '#16A34A',
              logo: MirageLogo,
            },
            {
              name: 'Reversable',
              price: '550.60',
              change: '-1.25%',
              color: '#8D8D8D',
              logo: ReversableLogo,
            },
          ].map((stock) => (
            <div key={stock.name} className="flex items-center gap-4 px-4 py-3">
              <div
                className="flex-none rounded-full"
                style={{ backgroundColor: stock.color }}
              >
                <stock.logo className="h-10 w-10" />
              </div>
              <div className="flex-auto text-sm text-gray-900">
                {stock.name}
              </div>
              <div className="flex-none text-right">
                <div className="text-sm font-medium text-gray-900">
                  {stock.price}
                </div>
                <div
                  className={clsx(
                    'text-xs/5',
                    stock.change.startsWith('+')
                      ? 'text-cyan-500'
                      : 'text-gray-500',
                  )}
                >
                  {stock.change}
                </div>
              </div>
            </div>
          ))}
        </div>
      </MotionAppScreenBody>
    </AppScreen>
  )
}

function InvestScreen(props: ScreenProps) {
  return (
    <AppScreen className="w-full">
      <MotionAppScreenHeader {...(props.animated ? headerAnimation : {})}>
        <AppScreen.Title>Buy $LA</AppScreen.Title>
        <AppScreen.Subtitle>
          <span className="text-white">$34.28</span> per share
        </AppScreen.Subtitle>
      </MotionAppScreenHeader>
      <MotionAppScreenBody
        {...(props.animated ? { ...bodyAnimation, custom: props.custom } : {})}
      >
        <div className="px-4 py-6">
          <div className="space-y-4">
            {[
              { label: 'Number of shares', value: '100' },
              {
                label: 'Current market price',
                value: (
                  <div className="flex">
                    $34.28
                    <svg viewBox="0 0 24 24" fill="none" className="h-6 w-6">
                      <path
                        d="M17 15V7H9M17 7 7 17"
                        stroke="#06B6D4"
                        strokeWidth="2"
                        strokeLinecap="round"
                        strokeLinejoin="round"
                      />
                    </svg>
                  </div>
                ),
              },
              { label: 'Estimated cost', value: '$3,428.00' },
            ].map((item) => (
              <div
                key={item.label}
                className="flex justify-between border-b border-gray-100 pb-4"
              >
                <div className="text-sm text-gray-500">{item.label}</div>
                <div className="text-sm font-semibold text-gray-900">
                  {item.value}
                </div>
              </div>
            ))}
            <div className="rounded-lg bg-cyan-500 px-3 py-2 text-center text-sm font-semibold text-white">
              Buy shares
            </div>
          </div>
        </div>
      </MotionAppScreenBody>
    </AppScreen>
  )
}

function usePrevious<T>(value: T) {
  let ref = useRef<T>()

  useEffect(() => {
    ref.current = value
  }, [value])

  return ref.current
}

function FeaturesDesktop() {
  let [changeCount, setChangeCount] = useState(0)
  let [selectedIndex, setSelectedIndex] = useState(0)
  let prevIndex = usePrevious(selectedIndex)
  let isForwards = prevIndex === undefined ? true : selectedIndex > prevIndex

  let onChange = useDebouncedCallback(
    (selectedIndex) => {
      setSelectedIndex(selectedIndex)
      setChangeCount((changeCount) => changeCount + 1)
    },
    100,
    { leading: true },
  )

  return (
    <TabGroup
      className="grid grid-cols-12 items-center gap-8 lg:gap-16 xl:gap-24"
      selectedIndex={selectedIndex}
      onChange={onChange}
      vertical
    >
      <TabList className="relative z-10 order-last col-span-6 space-y-6">
        {features.map((feature, featureIndex) => (
          <div
            key={feature.name}
            className="relative rounded-2xl transition-colors hover:bg-gray-800/30"
          >
            {featureIndex === selectedIndex && (
              <motion.div
                layoutId="activeBackground"
                className="absolute inset-0 bg-gray-800"
                initial={{ borderRadius: 16 }}
              />
            )}
            <div className="relative z-10 p-8">
              <feature.icon className="h-8 w-8" />
              <h3 className="mt-6 lg:text-lg text-base font-semibold text-white">
                <Tab className="text-left data-selected:not-data-focus:outline-hidden">
                  <span className="absolute inset-0 rounded-2xl" />
                  {feature.name}
                </Tab>
              </h3>
              <p className="mt-2 text-sm text-gray-400">
                {feature.description}
              </p>
            </div>
          </div>
        ))}
      </TabList>
      <div className="relative col-span-6">
        <div className="absolute top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2">
          <CircleBackground color="#13B5C8" className="animate-spin-slower" />
        </div>
        <PhoneFrame className="z-10 mx-auto w-full max-w-[366px]">
          <TabPanels as={Fragment}>
            <AnimatePresence
              initial={false}
              custom={{ isForwards, changeCount }}
            >
              {features.map((feature, featureIndex) =>
                selectedIndex === featureIndex ? (
                  <TabPanel
                    static
                    key={feature.name + changeCount}
                    className="col-start-1 row-start-1 flex focus:outline-offset-32 data-selected:not-data-focus:outline-hidden"
                  >
                    <feature.screen
                      animated
                      custom={{ isForwards, changeCount }}
                    />
                  </TabPanel>
                ) : null,
              )}
            </AnimatePresence>
          </TabPanels>
        </PhoneFrame>
      </div>
    </TabGroup>
  )
}

function FeaturesMobile() {
  let [activeIndex, setActiveIndex] = useState(0)
  let slideContainerRef = useRef<React.ElementRef<'div'>>(null)
  let slideRefs = useRef<Array<React.ElementRef<'div'>>>([])

  useEffect(() => {
    let observer = new window.IntersectionObserver(
      (entries) => {
        for (let entry of entries) {
          if (entry.isIntersecting && entry.target instanceof HTMLDivElement) {
            setActiveIndex(slideRefs.current.indexOf(entry.target))
            break
          }
        }
      },
      {
        root: slideContainerRef.current,
        threshold: 0.6,
      },
    )

    for (let slide of slideRefs.current) {
      if (slide) {
        observer.observe(slide)
      }
    }

    return () => {
      observer.disconnect()
    }
  }, [slideContainerRef, slideRefs])

  return (
    <>
      <div
        ref={slideContainerRef}
        className="-mb-4 flex snap-x snap-mandatory -space-x-4 overflow-x-auto overscroll-x-contain scroll-smooth pb-4 [scrollbar-width:none] sm:-space-x-6 [&::-webkit-scrollbar]:hidden"
      >
        {features.map((feature, featureIndex) => (
          <div
            key={featureIndex}
            ref={(ref) => ref && (slideRefs.current[featureIndex] = ref)}
            className="w-full flex-none snap-center px-4 sm:px-6"
          >
            <div className="relative transform overflow-hidden rounded-2xl bg-gray-800 px-5 py-6">
              <div className="absolute top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2">
                <CircleBackground
                  color="#13B5C8"
                  className={featureIndex % 2 === 1 ? 'rotate-180' : undefined}
                />
              </div>
              <PhoneFrame className="relative mx-auto w-full max-w-[366px]">
                <feature.screen />
              </PhoneFrame>
              <div className="absolute inset-x-0 bottom-0 bg-gray-800/95 p-6 backdrop-blur-sm sm:p-10">
                <feature.icon className="h-8 w-8" />
                <h3 className="mt-6 text-sm font-semibold text-white sm:lg:text-lg text-base">
                  {feature.name}
                </h3>
                <p className="mt-2 text-sm text-gray-400">
                  {feature.description}
                </p>
              </div>
            </div>
          </div>
        ))}
      </div>
      <div className="mt-6 flex justify-center gap-3">
        {features.map((_, featureIndex) => (
          <button
            type="button"
            key={featureIndex}
            className={clsx(
              'relative h-0.5 w-4 rounded-full',
              featureIndex === activeIndex ? 'bg-gray-300' : 'bg-gray-500',
            )}
            aria-label={`Go to slide ${featureIndex + 1}`}
            onClick={() => {
              slideRefs.current[featureIndex].scrollIntoView({
                block: 'nearest',
                inline: 'nearest',
              })
            }}
          >
            <span className="absolute -inset-x-1.5 -inset-y-3" />
          </button>
        ))}
      </div>
    </>
  )
}

export function PrimaryFeatures() {
  return (
    <section
      id="features"
      aria-label="Features for investing all your money"
      className="bg-gray-900 py-20 sm:py-32"
    >
      <Container>
        <div className="mx-auto max-w-2xl lg:mx-0 lg:max-w-3xl">
          <h2 className="text-3xl font-medium tracking-tight text-white">
            Every feature you need to win. Try it for yourself.
          </h2>
          <p className="mt-2 lg:text-lg text-base text-gray-400">
            EngageOS was built for investors like you who play by their own rules
            and aren’t going to let SEC regulations get in the way of their
            dreams. If other investing tools are afraid to build it, EngageOS has
            it.
          </p>
        </div>
      </Container>
      <div className="mt-16 md:hidden">
        <FeaturesMobile />
      </div>
      <Container className="hidden md:mt-20 md:block">
        <FeaturesDesktop />
      </Container>
    </section>
  )
}