mirror of
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116 lines
3.2 KiB
TypeScript
116 lines
3.2 KiB
TypeScript
import React, { lazy, Suspense, useEffect, useState } from 'react'
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import { useTranslation } from 'react-i18next'
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import MessageInput from './message-input'
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import InfiniteScroll from './infinite-scroll'
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import ChatFallbackError from './chat-fallback-error'
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import Icon from '../../../shared/components/icon'
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import { useLayoutContext } from '../../../shared/context/layout-context'
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import { useUserContext } from '../../../shared/context/user-context'
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import withErrorBoundary from '../../../infrastructure/error-boundary'
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import { FetchError } from '../../../infrastructure/fetch-json'
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import { useChatContext } from '../context/chat-context'
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import LoadingSpinner from '../../../shared/components/loading-spinner'
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const MessageList = lazy(() => import('./message-list'))
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const ChatPane = React.memo(function ChatPane() {
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const { t } = useTranslation()
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const { chatIsOpen } = useLayoutContext()
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const user = useUserContext()
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const {
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status,
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messages,
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initialMessagesLoaded,
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atEnd,
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loadInitialMessages,
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loadMoreMessages,
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reset,
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sendMessage,
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markMessagesAsRead,
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error,
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} = useChatContext()
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useEffect(() => {
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if (chatIsOpen && !initialMessagesLoaded) {
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loadInitialMessages()
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}
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}, [chatIsOpen, loadInitialMessages, initialMessagesLoaded])
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const shouldDisplayPlaceholder = status !== 'pending' && messages.length === 0
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const messageContentCount = messages.reduce(
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(acc, { contents }) => acc + contents.length,
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0
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)
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// Keep the chat pane in the DOM to avoid resetting the form input and re-rendering MathJax content.
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const [chatOpenedOnce, setChatOpenedOnce] = useState(chatIsOpen)
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useEffect(() => {
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if (chatIsOpen) {
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setChatOpenedOnce(true)
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}
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}, [chatIsOpen])
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if (error) {
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// let user try recover from fetch errors
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if (error instanceof FetchError) {
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return <ChatFallbackError reconnect={reset} />
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}
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throw error
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}
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if (!user) {
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return null
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}
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if (!chatOpenedOnce) {
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return null
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}
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return (
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<aside className="chat">
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<InfiniteScroll
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atEnd={atEnd}
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className="messages"
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fetchData={loadMoreMessages}
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isLoading={status === 'pending'}
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itemCount={messageContentCount}
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>
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<div>
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<h2 className="sr-only">{t('chat')}</h2>
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<Suspense fallback={<LoadingSpinner delay={500} />}>
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{status === 'pending' && <LoadingSpinner delay={500} />}
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{shouldDisplayPlaceholder && <Placeholder />}
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<MessageList
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messages={messages}
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userId={user.id}
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resetUnreadMessages={markMessagesAsRead}
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/>
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</Suspense>
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</div>
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</InfiniteScroll>
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<MessageInput
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resetUnreadMessages={markMessagesAsRead}
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sendMessage={sendMessage}
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/>
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</aside>
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)
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})
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function Placeholder() {
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const { t } = useTranslation()
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return (
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<>
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<div className="no-messages text-center small">{t('no_messages')}</div>
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<div className="first-message text-center">
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{t('send_first_message')}
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<br />
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<Icon type="arrow-down" />
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</div>
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</>
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)
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}
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export default withErrorBoundary(ChatPane, ChatFallbackError)
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