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import React from 'react'
import {View} from 'react-native'
import {useReducedMotion} from 'react-native-reanimated'
import {i18n} from '@lingui/core'
import {decideShouldRoll} from 'lib/custom-animations/util'
import {s} from 'lib/styles'
import {formatCount} from 'view/com/util/numeric/format'
import {Text} from 'view/com/util/text/Text'
import {atoms as a, useTheme} from '#/alf'
const animationConfig = {
duration: 400,
easing: 'cubic-bezier(0.4, 0, 0.2, 1)',
fill: 'forwards' as FillMode,
}
const enteringUpKeyframe = [
{opacity: 0, transform: 'translateY(18px)'},
{opacity: 1, transform: 'translateY(0)'},
]
const enteringDownKeyframe = [
{opacity: 0, transform: 'translateY(-18px)'},
{opacity: 1, transform: 'translateY(0)'},
]
const exitingUpKeyframe = [
{opacity: 1, transform: 'translateY(0)'},
{opacity: 0, transform: 'translateY(-18px)'},
]
const exitingDownKeyframe = [
{opacity: 1, transform: 'translateY(0)'},
{opacity: 0, transform: 'translateY(18px)'},
]
export function CountWheel({
likeCount,
big,
isLiked,
}: {
likeCount: number
big?: boolean
isLiked: boolean
}) {
const t = useTheme()
const shouldAnimate = !useReducedMotion()
const shouldRoll = decideShouldRoll(isLiked, likeCount)
const countView = React.useRef<HTMLDivElement>(null)
const prevCountView = React.useRef<HTMLDivElement>(null)
const [prevCount, setPrevCount] = React.useState(likeCount)
const prevIsLiked = React.useRef(isLiked)
const formattedCount = formatCount(i18n, likeCount)
const formattedPrevCount = formatCount(i18n, prevCount)
React.useEffect(() => {
if (isLiked === prevIsLiked.current) {
return
}
const newPrevCount = isLiked ? likeCount - 1 : likeCount + 1
if (shouldAnimate && shouldRoll) {
countView.current?.animate?.(
isLiked ? enteringUpKeyframe : enteringDownKeyframe,
animationConfig,
)
prevCountView.current?.animate?.(
isLiked ? exitingUpKeyframe : exitingDownKeyframe,
animationConfig,
)
setPrevCount(newPrevCount)
}
prevIsLiked.current = isLiked
}, [isLiked, likeCount, shouldAnimate, shouldRoll])
if (likeCount < 1) {
return null
}
return (
<View>
<View
aria-disabled={true}
// @ts-expect-error is div
ref={countView}>
<Text
testID="likeCount"
style={[
big ? a.text_md : {fontSize: 15},
a.user_select_none,
isLiked
? [a.font_bold, s.likeColor]
: {color: t.palette.contrast_500},
]}>
{formattedCount}
</Text>
</View>
{shouldAnimate ? (
<View
style={{position: 'absolute'}}
aria-disabled={true}
// @ts-expect-error is div
ref={prevCountView}>
<Text
style={[
big ? a.text_md : {fontSize: 15},
a.user_select_none,
isLiked
? [a.font_bold, s.likeColor]
: {color: t.palette.contrast_500},
]}>
{formattedPrevCount}
</Text>
</View>
) : null}
</View>
)
}
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