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import React, {useCallback, useEffect, useState} from 'react'
import {
Image,
ImageStyle,
TouchableOpacity,
TouchableWithoutFeedback,
StyleSheet,
View,
Pressable,
} from 'react-native'
import {
FontAwesomeIcon,
FontAwesomeIconStyle,
} from '@fortawesome/react-native-fontawesome'
import {colors, s} from 'lib/styles'
import ImageDefaultHeader from './ImageViewing/components/ImageDefaultHeader'
import {Text} from '../util/text/Text'
import {useLingui} from '@lingui/react'
import {msg} from '@lingui/macro'
import {
useLightbox,
useLightboxControls,
ImagesLightbox,
ProfileImageLightbox,
} from '#/state/lightbox'
import {useWebBodyScrollLock} from '#/lib/hooks/useWebBodyScrollLock'
interface Img {
uri: string
alt?: string
}
export function Lightbox() {
const {activeLightbox} = useLightbox()
const {closeLightbox} = useLightboxControls()
const isActive = !!activeLightbox
useWebBodyScrollLock(isActive)
if (!isActive) {
return null
}
const initialIndex =
activeLightbox instanceof ImagesLightbox ? activeLightbox.index : 0
let imgs: Img[] | undefined
if (activeLightbox instanceof ProfileImageLightbox) {
const opts = activeLightbox
if (opts.profile.avatar) {
imgs = [{uri: opts.profile.avatar}]
}
} else if (activeLightbox instanceof ImagesLightbox) {
const opts = activeLightbox
imgs = opts.images
}
if (!imgs) {
return null
}
return (
<LightboxInner
imgs={imgs}
initialIndex={initialIndex}
onClose={closeLightbox}
/>
)
}
function LightboxInner({
imgs,
initialIndex = 0,
onClose,
}: {
imgs: Img[]
initialIndex: number
onClose: () => void
}) {
const {_} = useLingui()
const [index, setIndex] = useState<number>(initialIndex)
const [isAltExpanded, setAltExpanded] = useState(false)
const canGoLeft = index >= 1
const canGoRight = index < imgs.length - 1
const onPressLeft = useCallback(() => {
if (canGoLeft) {
setIndex(index - 1)
}
}, [index, canGoLeft])
const onPressRight = useCallback(() => {
if (canGoRight) {
setIndex(index + 1)
}
}, [index, canGoRight])
const onKeyDown = useCallback(
(e: KeyboardEvent) => {
if (e.key === 'Escape') {
onClose()
} else if (e.key === 'ArrowLeft') {
onPressLeft()
} else if (e.key === 'ArrowRight') {
onPressRight()
}
},
[onClose, onPressLeft, onPressRight],
)
useEffect(() => {
window.addEventListener('keydown', onKeyDown)
return () => window.removeEventListener('keydown', onKeyDown)
}, [onKeyDown])
return (
<View style={styles.mask}>
<TouchableWithoutFeedback
onPress={onClose}
accessibilityRole="button"
accessibilityLabel={_(msg`Close image viewer`)}
accessibilityHint={_(msg`Exits image view`)}
onAccessibilityEscape={onClose}>
<View style={styles.imageCenterer}>
<Image
accessibilityIgnoresInvertColors
source={imgs[index]}
style={styles.image as ImageStyle}
accessibilityLabel={imgs[index].alt}
accessibilityHint=""
/>
{canGoLeft && (
<TouchableOpacity
onPress={onPressLeft}
style={[styles.btn, styles.leftBtn]}
accessibilityRole="button"
accessibilityLabel={_(msg`Previous image`)}
accessibilityHint="">
<FontAwesomeIcon
icon="angle-left"
style={styles.icon as FontAwesomeIconStyle}
size={40}
/>
</TouchableOpacity>
)}
{canGoRight && (
<TouchableOpacity
onPress={onPressRight}
style={[styles.btn, styles.rightBtn]}
accessibilityRole="button"
accessibilityLabel={_(msg`Next image`)}
accessibilityHint="">
<FontAwesomeIcon
icon="angle-right"
style={styles.icon as FontAwesomeIconStyle}
size={40}
/>
</TouchableOpacity>
)}
</View>
</TouchableWithoutFeedback>
{imgs[index].alt ? (
<View style={styles.footer}>
<Pressable
accessibilityLabel={_(msg`Expand alt text`)}
accessibilityHint={_(
msg`If alt text is long, toggles alt text expanded state`,
)}
onPress={() => {
setAltExpanded(!isAltExpanded)
}}>
<Text
style={s.white}
numberOfLines={isAltExpanded ? 0 : 3}
ellipsizeMode="tail">
{imgs[index].alt}
</Text>
</Pressable>
</View>
) : null}
<View style={styles.closeBtn}>
<ImageDefaultHeader onRequestClose={onClose} />
</View>
</View>
)
}
const styles = StyleSheet.create({
mask: {
// @ts-ignore
position: 'fixed',
top: 0,
left: 0,
width: '100%',
height: '100%',
backgroundColor: '#000c',
},
imageCenterer: {
flex: 1,
alignItems: 'center',
justifyContent: 'center',
},
image: {
width: '100%',
height: '100%',
resizeMode: 'contain',
},
icon: {
color: colors.white,
},
closeBtn: {
position: 'absolute',
top: 10,
right: 10,
},
btn: {
position: 'absolute',
backgroundColor: '#000',
width: 50,
height: 50,
justifyContent: 'center',
alignItems: 'center',
borderRadius: 25,
},
leftBtn: {
left: 30,
top: '50%',
},
rightBtn: {
position: 'absolute',
right: 30,
top: '50%',
},
footer: {
paddingHorizontal: 32,
paddingVertical: 24,
backgroundColor: colors.black,
},
})
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