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import React, {
forwardRef,
useEffect,
useImperativeHandle,
useState,
} from 'react'
import {ReactRenderer} from '@tiptap/react'
import tippy, {Instance as TippyInstance} from 'tippy.js'
import {
SuggestionOptions,
SuggestionProps,
SuggestionKeyDownProps,
} from '@tiptap/suggestion'
import {UserAutocompleteModel} from 'state/models/discovery/user-autocomplete'
interface MentionListRef {
onKeyDown: (props: SuggestionKeyDownProps) => boolean
}
export function createSuggestion({
autocompleteView,
}: {
autocompleteView: UserAutocompleteModel
}): Omit<SuggestionOptions, 'editor'> {
return {
async items({query}) {
autocompleteView.setActive(true)
await autocompleteView.setPrefix(query)
return autocompleteView.suggestions.slice(0, 8).map(s => s.handle)
},
render: () => {
let component: ReactRenderer<MentionListRef> | undefined
let popup: TippyInstance[] | undefined
return {
onStart: props => {
component = new ReactRenderer(MentionList, {
props,
editor: props.editor,
})
if (!props.clientRect) {
return
}
// @ts-ignore getReferenceClientRect doesnt like that clientRect can return null -prf
popup = tippy('body', {
getReferenceClientRect: props.clientRect,
appendTo: () => document.body,
content: component.element,
showOnCreate: true,
interactive: true,
trigger: 'manual',
placement: 'bottom-start',
})
},
onUpdate(props) {
component?.updateProps(props)
if (!props.clientRect) {
return
}
popup?.[0]?.setProps({
// @ts-ignore getReferenceClientRect doesnt like that clientRect can return null -prf
getReferenceClientRect: props.clientRect,
})
},
onKeyDown(props) {
if (props.event.key === 'Escape') {
popup?.[0]?.hide()
return true
}
return component?.ref?.onKeyDown(props) || false
},
onExit() {
popup?.[0]?.destroy()
component?.destroy()
},
}
},
}
}
const MentionList = forwardRef<MentionListRef, SuggestionProps>(
(props: SuggestionProps, ref) => {
const [selectedIndex, setSelectedIndex] = useState(0)
const selectItem = (index: number) => {
const item = props.items[index]
if (item) {
props.command({id: item})
}
}
const upHandler = () => {
setSelectedIndex(
(selectedIndex + props.items.length - 1) % props.items.length,
)
}
const downHandler = () => {
setSelectedIndex((selectedIndex + 1) % props.items.length)
}
const enterHandler = () => {
selectItem(selectedIndex)
}
useEffect(() => setSelectedIndex(0), [props.items])
useImperativeHandle(ref, () => ({
onKeyDown: ({event}) => {
if (event.key === 'ArrowUp') {
upHandler()
return true
}
if (event.key === 'ArrowDown') {
downHandler()
return true
}
if (event.key === 'Enter') {
enterHandler()
return true
}
return false
},
}))
return (
<div className="items">
{props.items.length ? (
props.items.map((item, index) => (
<button
className={`item ${index === selectedIndex ? 'is-selected' : ''}`}
key={index}
onClick={() => selectItem(index)}>
{item}
</button>
))
) : (
<div className="item">No result</div>
)}
</div>
)
},
)
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