overleaf/services/web/frontend/js/features/chat/context/chat-context.js

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import React, {
createContext,
useCallback,
useContext,
useState,
useEffect
} from 'react'
import PropTypes from 'prop-types'
import { useApplicationContext } from '../../../shared/context/application-context'
import { useEditorContext } from '../../../shared/context/editor-context'
import { ChatStore } from '../store/chat-store'
import useBrowserWindow from '../../../infrastructure/browser-window-hook'
import { useLayoutContext } from '../../../shared/context/layout-context'
export const ChatContext = createContext()
ChatContext.Provider.propTypes = {
value: PropTypes.shape({
userId: PropTypes.string.isRequired,
atEnd: PropTypes.bool,
loading: PropTypes.bool,
messages: PropTypes.array.isRequired,
unreadMessageCount: PropTypes.number.isRequired,
resetUnreadMessageCount: PropTypes.func.isRequired,
loadMoreMessages: PropTypes.func.isRequired,
sendMessage: PropTypes.func.isRequired
}).isRequired
}
export function ChatProvider({ children }) {
const {
hasFocus: windowHasFocus,
flashTitle,
stopFlashingTitle
} = useBrowserWindow()
const { user } = useApplicationContext({
user: PropTypes.shape({ id: PropTypes.string.isRequired }.isRequired)
})
const { projectId } = useEditorContext({
projectId: PropTypes.string.isRequired
})
const { chatIsOpen } = useLayoutContext({ chatIsOpen: PropTypes.bool })
const [unreadMessageCount, setUnreadMessageCount] = useState(0)
function resetUnreadMessageCount() {
setUnreadMessageCount(0)
}
const [atEnd, setAtEnd] = useState(false)
const [loading, setLoading] = useState(false)
const [messages, setMessages] = useState([])
const [store] = useState(() => new ChatStore(user, projectId))
useEffect(() => {
if (windowHasFocus) {
stopFlashingTitle()
if (chatIsOpen) {
setUnreadMessageCount(0)
}
}
if (!windowHasFocus && unreadMessageCount > 0) {
flashTitle('New Message')
}
}, [
windowHasFocus,
chatIsOpen,
unreadMessageCount,
flashTitle,
stopFlashingTitle
])
useEffect(() => {
function updateState() {
setAtEnd(store.atEnd)
setLoading(store.loading)
setMessages(store.messages)
}
function handleNewMessage() {
setUnreadMessageCount(prevCount => prevCount + 1)
}
store.on('updated', updateState)
store.on('message-received', handleNewMessage)
updateState()
return () => store.destroy()
}, [store])
const loadMoreMessages = useCallback(() => store.loadMoreMessages(), [store])
const sendMessage = useCallback(message => store.sendMessage(message), [
store
])
const value = {
userId: user.id,
atEnd,
loading,
messages,
unreadMessageCount,
resetUnreadMessageCount,
loadMoreMessages,
sendMessage
}
return <ChatContext.Provider value={value}>{children}</ChatContext.Provider>
}
ChatProvider.propTypes = {
children: PropTypes.any
}
export function useChatContext() {
return useContext(ChatContext)
}