aris/apps/aelis-client/src/components/parallax-scroll-view.tsx

import type { PropsWithChildren, ReactElement } from "react"

import { StyleSheet } from "react-native"
import Animated, {
	interpolate,
	useAnimatedRef,
	useAnimatedStyle,
	useScrollOffset,
} from "react-native-reanimated"

import { ThemedView } from "@/components/themed-view"
import { useColorScheme } from "@/hooks/use-color-scheme"
import { useThemeColor } from "@/hooks/use-theme-color"

const HEADER_HEIGHT = 250

type Props = PropsWithChildren<{
	headerImage: ReactElement
	headerBackgroundColor: { dark: string; light: string }
}>

export default function ParallaxScrollView({
	children,
	headerImage,
	headerBackgroundColor,
}: Props) {
	const backgroundColor = useThemeColor({}, "background")
	const colorScheme = useColorScheme() ?? "light"
	const scrollRef = useAnimatedRef<Animated.ScrollView>()
	const scrollOffset = useScrollOffset(scrollRef)
	const headerAnimatedStyle = useAnimatedStyle(() => {
		return {
			transform: [
				{
					translateY: interpolate(
						scrollOffset.value,
						[-HEADER_HEIGHT, 0, HEADER_HEIGHT],
						[-HEADER_HEIGHT / 2, 0, HEADER_HEIGHT * 0.75],
					),
				},
				{
					scale: interpolate(scrollOffset.value, [-HEADER_HEIGHT, 0, HEADER_HEIGHT], [2, 1, 1]),
				},
			],
		}
	})

	return (
		<Animated.ScrollView
			ref={scrollRef}
			style={{ backgroundColor, flex: 1 }}
			scrollEventThrottle={16}
		>
			<Animated.View
				style={[
					styles.header,
					{ backgroundColor: headerBackgroundColor[colorScheme] },
					headerAnimatedStyle,
				]}
			>
				{headerImage}
			</Animated.View>
			<ThemedView style={styles.content}>{children}</ThemedView>
		</Animated.ScrollView>
	)
}

const styles = StyleSheet.create({
	container: {
		flex: 1,
	},
	header: {
		height: HEADER_HEIGHT,
		overflow: "hidden",
	},
	content: {
		flex: 1,
		padding: 32,
		gap: 16,
		overflow: "hidden",
	},
})