import * as React from "react"
import Ripples from 'react-ripples'
import styled from "styled-components"
import { variant } from "styled-system"
import { MdChevronLeft, MdChevronRight } from "react-icons/md"
import { useTransition, animated } from 'react-spring'
import { Box } from "./Box"
import { Text } from "./Text"

const Wrapper = styled(Box)`
  height: 400px;
  position: relative;
  width: 100%;
  display: grid;
  grid-template-columns: [left-chevron] 1fr [content] 8fr [right-chevron] 1fr;
`

const ContentWrapper = styled(Box)({
  gridColumn: 'content',
  position: 'relative',
  '& > div': {
    willChange: 'transform, opacity',
    position: 'absolute',
    width: '100%',
    height: '100%',
  },
})

const SlideControlWrapper = styled(Ripples)({
  display: 'flex',
  alignItems: 'center',
  justifyContent: 'center',
  cursor: 'pointer',
}, variant({
  variants: {
    disabled: { opacity: 0.6, pointerEvents: 'none' }
  }
}))

const SlideControl = ({ children, ...props }) =>
  <SlideControlWrapper {...props}>
    {children}
  </SlideControlWrapper>

const initialState = {
  currentIndex: 0,
  animation: {
    enter: { opacity: 1, transform: "translate3d(0%, 0, 0)" },
    leave: { opacity: 0, transform: "translate3d(100%, 0 ,0)" },
    from: { opacity: 0, transform: "translate3d(-50%, 0, 0)" },
  },
}

const CarouselContext = React.createContext({
  previous: () => {},
  next: () => {},
  carouselState: initialState,
})

export const useCarousel = () => React.useContext(CarouselContext)
export const Provider = ({ children }) => {
  const [carouselState, setCarouselState] = React.useState(initialState)

  const previous = () => {
    setCarouselState({
      currentIndex: carouselState.currentIndex - 1,
      animation: {
        enter: { opacity: 1, transform: "translate3d(0%, 0, 0)" },
        leave: { opacity: 0, transform: "translate3d(100%, 0 ,0)" },
        from: { opacity: 0, transform: "translate3d(-50%, 0, 0)" },
      },
    })
  }
  const next = () => {
    setCarouselState({
      currentIndex: carouselState.currentIndex + 1,
      animation: {
        from: { opacity: 0, transform: "translate3d(100%, 0 ,0)" },
        enter: { opacity: 1, transform: "translate3d(0%, 0, 0)" },
        leave: { opacity: 0, transform: "translate3d(-50%, 0, 0)" },
      },
    })
  }

  return (
    <CarouselContext.Provider value={{ previous, next, carouselState }}>
      {children}
    </CarouselContext.Provider>
  )
}

export const Carousel = ({ items }) => {
  const { previous, carouselState, next } = useCarousel()
  const transitions = useTransition([carouselState.currentIndex], item => item, {
    reset: true,
    unique: true,
    ...carouselState.animation,
  })

  return (
    <Wrapper>
      <SlideControl
        gridColumn="left-chevron"
        onClick={previous}
        variant={carouselState.currentIndex == 0 ? "disabled" : "normal"}
      >
        <Text color="black" fontSize="48px">
          <MdChevronLeft />
        </Text>
      </SlideControl>
      <ContentWrapper height="400px">
        {transitions.map(({ item, props, key }) => <animated.div key={key} style={props}>{items[item]()}</animated.div>)}
      </ContentWrapper>
      <SlideControl
        gridColumn="right-chevron"
        onClick={next}
        variant={
          carouselState.currentIndex == items.length - 1 ? "disabled" : "normal"
        }
      >
        <Text color="black" fontSize="48px">
          <MdChevronRight />
        </Text>
      </SlideControl>
    </Wrapper>
  )
}