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import {useEffect, useState} from 'react'
import {View} from 'react-native'
import {ActivityIndicator} from 'react-native'
import Animated, {
Extrapolation,
interpolate,
runOnJS,
type SharedValue,
useAnimatedProps,
useAnimatedReaction,
useAnimatedStyle,
} from 'react-native-reanimated'
import {useSafeAreaInsets} from 'react-native-safe-area-context'
import {BlurView} from 'expo-blur'
import {useIsFetching} from '@tanstack/react-query'
import type React from 'react'
import {isIOS} from '#/platform/detection'
import {RQKEY_ROOT as STARTERPACK_RQKEY_ROOT} from '#/state/queries/actor-starter-packs'
import {RQKEY_ROOT as FEED_RQKEY_ROOT} from '#/state/queries/post-feed'
import {RQKEY_ROOT as FEEDGEN_RQKEY_ROOT} from '#/state/queries/profile-feedgens'
import {RQKEY_ROOT as LIST_RQKEY_ROOT} from '#/state/queries/profile-lists'
import {usePagerHeaderContext} from '#/view/com/pager/PagerHeaderContext'
import {atoms as a} from '#/alf'
const AnimatedBlurView = Animated.createAnimatedComponent(BlurView)
export function GrowableBanner({
backButton,
children,
}: {
backButton?: React.ReactNode
children: React.ReactNode
}) {
const pagerContext = usePagerHeaderContext()
// plain non-growable mode for Android/Web
if (!pagerContext || !isIOS) {
return (
<View style={[a.w_full, a.h_full]}>
{children}
{backButton}
</View>
)
}
const {scrollY} = pagerContext
return (
<GrowableBannerInner scrollY={scrollY} backButton={backButton}>
{children}
</GrowableBannerInner>
)
}
function GrowableBannerInner({
scrollY,
backButton,
children,
}: {
scrollY: SharedValue<number>
backButton?: React.ReactNode
children: React.ReactNode
}) {
const {top: topInset} = useSafeAreaInsets()
const isFetching = useIsProfileFetching()
const animateSpinner = useShouldAnimateSpinner({isFetching, scrollY})
const animatedStyle = useAnimatedStyle(() => ({
transform: [
{
scale: interpolate(scrollY.get(), [-150, 0], [2, 1], {
extrapolateRight: Extrapolation.CLAMP,
}),
},
],
}))
const animatedBlurViewProps = useAnimatedProps(() => {
return {
intensity: interpolate(
scrollY.get(),
[-300, -65, -15],
[50, 40, 0],
Extrapolation.CLAMP,
),
}
})
const animatedSpinnerStyle = useAnimatedStyle(() => {
const scrollYValue = scrollY.get()
return {
display: scrollYValue < 0 ? 'flex' : 'none',
opacity: interpolate(
scrollYValue,
[-60, -15],
[1, 0],
Extrapolation.CLAMP,
),
transform: [
{translateY: interpolate(scrollYValue, [-150, 0], [-75, 0])},
{rotate: '90deg'},
],
}
})
const animatedBackButtonStyle = useAnimatedStyle(() => ({
transform: [
{
translateY: interpolate(scrollY.get(), [-150, 10], [-150, 10], {
extrapolateRight: Extrapolation.CLAMP,
}),
},
],
}))
return (
<>
<Animated.View
style={[
a.absolute,
{left: 0, right: 0, bottom: 0},
{height: 150},
{transformOrigin: 'bottom'},
animatedStyle,
]}>
{children}
<AnimatedBlurView
style={[a.absolute, a.inset_0]}
tint="dark"
animatedProps={animatedBlurViewProps}
/>
</Animated.View>
<View
style={[
a.absolute,
a.inset_0,
{top: topInset - (isIOS ? 15 : 0)},
a.justify_center,
a.align_center,
]}>
<Animated.View style={[animatedSpinnerStyle]}>
<ActivityIndicator
key={animateSpinner ? 'spin' : 'stop'}
size="large"
color="white"
animating={animateSpinner}
hidesWhenStopped={false}
/>
</Animated.View>
</View>
<Animated.View style={[animatedBackButtonStyle]}>
{backButton}
</Animated.View>
</>
)
}
function useIsProfileFetching() {
// are any of the profile-related queries fetching?
return [
useIsFetching({queryKey: [FEED_RQKEY_ROOT]}),
useIsFetching({queryKey: [FEEDGEN_RQKEY_ROOT]}),
useIsFetching({queryKey: [LIST_RQKEY_ROOT]}),
useIsFetching({queryKey: [STARTERPACK_RQKEY_ROOT]}),
].some(isFetching => isFetching)
}
function useShouldAnimateSpinner({
isFetching,
scrollY,
}: {
isFetching: boolean
scrollY: SharedValue<number>
}) {
const [isOverscrolled, setIsOverscrolled] = useState(false)
// HACK: it reports a scroll pos of 0 for a tick when fetching finishes
// so paper over that by keeping it true for a bit -sfn
const stickyIsOverscrolled = useStickyToggle(isOverscrolled, 10)
useAnimatedReaction(
() => scrollY.get() < -5,
(value, prevValue) => {
if (value !== prevValue) {
runOnJS(setIsOverscrolled)(value)
}
},
[scrollY],
)
const [isAnimating, setIsAnimating] = useState(isFetching)
if (isFetching && !isAnimating) {
setIsAnimating(true)
}
if (!isFetching && isAnimating && !stickyIsOverscrolled) {
setIsAnimating(false)
}
return isAnimating
}
// stayed true for at least `delay` ms before returning to false
function useStickyToggle(value: boolean, delay: number) {
const [prevValue, setPrevValue] = useState(value)
const [isSticking, setIsSticking] = useState(false)
useEffect(() => {
if (isSticking) {
const timeout = setTimeout(() => setIsSticking(false), delay)
return () => clearTimeout(timeout)
}
}, [isSticking, delay])
if (value !== prevValue) {
setIsSticking(prevValue) // Going true -> false should stick.
setPrevValue(value)
return prevValue ? true : value
}
return isSticking ? true : value
}
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