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import React, {useCallback, useEffect} from 'react'
import {
Image,
TouchableOpacity,
TouchableWithoutFeedback,
StyleSheet,
View,
} from 'react-native'
import {observer} from 'mobx-react-lite'
import {FontAwesomeIcon} from '@fortawesome/react-native-fontawesome'
import {useStores} from 'state/index'
import * as models from 'state/models/ui/shell'
import {colors} from 'lib/styles'
import ImageDefaultHeader from './ImageViewing/components/ImageDefaultHeader'
interface Img {
uri: string
}
export const Lightbox = observer(function Lightbox() {
const store = useStores()
if (!store.shell.isLightboxActive) {
return null
}
const activeLightbox = store.shell.activeLightbox
const initialIndex =
activeLightbox instanceof models.ImagesLightbox ? activeLightbox.index : 0
const onClose = () => store.shell.closeLightbox()
let imgs: Img[] | undefined
if (activeLightbox instanceof models.ProfileImageLightbox) {
const opts = activeLightbox
if (opts.profileView.avatar) {
imgs = [{uri: opts.profileView.avatar}]
}
} else if (activeLightbox instanceof models.ImagesLightbox) {
const opts = activeLightbox
imgs = opts.uris.map(uri => ({uri}))
}
if (!imgs) {
return null
}
return (
<LightboxInner imgs={imgs} initialIndex={initialIndex} onClose={onClose} />
)
})
function LightboxInner({
imgs,
initialIndex = 0,
onClose,
}: {
imgs: Img[]
initialIndex: number
onClose: () => void
}) {
const [index, setIndex] = React.useState<number>(initialIndex)
const canGoLeft = index >= 1
const canGoRight = index < imgs.length - 1
const onPressLeft = () => {
if (canGoLeft) {
setIndex(index - 1)
}
}
const onPressRight = () => {
if (canGoRight) {
setIndex(index + 1)
}
}
const onEscape = useCallback(
(e: KeyboardEvent) => {
if (e.key === 'Escape') {
onClose()
}
},
[onClose],
)
useEffect(() => {
window.addEventListener('keydown', onEscape)
return () => window.removeEventListener('keydown', onEscape)
}, [onEscape])
return (
<View style={styles.mask}>
<TouchableWithoutFeedback
onPress={onClose}
accessibilityRole="button"
accessibilityLabel="Close image viewer"
accessibilityHint="Exits image view"
onAccessibilityEscape={onClose}>
<View style={styles.imageCenterer}>
<Image
accessibilityIgnoresInvertColors
source={imgs[index]}
style={styles.image}
/>
{canGoLeft && (
<TouchableOpacity
onPress={onPressLeft}
style={[styles.btn, styles.leftBtn]}
accessibilityRole="button"
accessibilityLabel="Go back"
accessibilityHint="Navigates to previous image in viewer">
<FontAwesomeIcon
icon="angle-left"
style={styles.icon}
size={40}
/>
</TouchableOpacity>
)}
{canGoRight && (
<TouchableOpacity
onPress={onPressRight}
style={[styles.btn, styles.rightBtn]}
accessibilityRole="button"
accessibilityLabel="Go to next"
accessibilityHint="Navigates to next image in viewer">
<FontAwesomeIcon
icon="angle-right"
style={styles.icon}
size={40}
/>
</TouchableOpacity>
)}
</View>
</TouchableWithoutFeedback>
<View style={styles.closeBtn}>
<ImageDefaultHeader onRequestClose={onClose} />
</View>
</View>
)
}
const styles = StyleSheet.create({
mask: {
position: 'absolute',
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%',
},
})
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