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import React, { ReactElement, useCallback, useEffect, useRef, useState } from "react";
import Chat, { MessageProps, useMessages } from "@chatui/core";
import { QuickReplyItemProps } from "@chatui/core/lib/components/QuickReplies";
import { useTranslation } from "react-i18next";
import "../../css/scrollbar.css";
import "./ChatBox.less";
import { MessageContainerHandle } from "@chatui/core/lib/components/MessageContainer";
import { NavbarProps } from "@chatui/core/lib/components/Navbar";
import {
askAiAssistant,
ChatMessageProps,
listHistoricalChatMessages,
pullChatMessages
} from "./FetchUtils";
import { autoFocusTextarea } from '@utils/BrowserUtils';
import ReconnectableSocket, { SocketInterface } from "@utils/WebsocketUtils";
import { WEBSOCKET_SERVER_URL } from "@config/base";
import { DisplayMode } from "@props/RecordProps";
import { useSlashCommand } from "@utils/hooks";
export type Message<T> = {
content?: T;
uuid: string;
type: "PENDING" | "RECEIVED" | "SYSTEM";
position: "left" | "right";
user: {
id: number;
}
}
type IMessage<T> = Message<T> & MessageProps;
export type PendingMessage<T> = Message<T> & {
type: "PENDING";
status: "pending" | "fail";
createdAt: number;
content: T;
}
type IPendingMessage<T> = PendingMessage<T> & MessageProps;
export type SystemMessage = Message<never> & {
type: "SYSTEM";
category: "typing";
createdAt: number;
}
type ISystemMessage = SystemMessage & MessageProps;
export type ReceivedMessage<T> = Message<T> & {
type: "RECEIVED";
index: number;
createdAt: number;
content: T;
}
export const isPendingMessage = <T,>(message: Message<T>): message is PendingMessage<T> => message.type === "PENDING";
export const isReceivedMessage = <T,>(message: Message<T>): message is ReceivedMessage<T> => message.type === "RECEIVED";
export const isSystemMessage = <T,>(message: Message<T>): message is SystemMessage => message.type === "SYSTEM";
type IReceivedMessage<T> = ReceivedMessage<T> & MessageProps;
enum ChatWebSocketDownstreamType {
SESSION_READY = "SESSION_READY",
MESSAGE = "MESSAGE",
TYPING = "TYPING",
}
interface ChatDownstreamReadyData {
type: ChatWebSocketDownstreamType.SESSION_READY;
}
interface ChatDownstreamMessageData {
type: ChatWebSocketDownstreamType.MESSAGE;
payload: {
conversationId: number;
type: 'NEW_MESSAGE' | 'UPDATE_MESSAGE';
message: ChatMessageProps;
}
}
interface ChatDownstreamTypingData {
type: ChatWebSocketDownstreamType.TYPING;
payload: {
conversationId: number;
userId: number;
}
}
type ChatDownstreamData = ChatDownstreamReadyData | ChatDownstreamMessageData | ChatDownstreamTypingData;
export const isChatDownstreamReadyData = (data: ChatDownstreamData): data is ChatDownstreamReadyData => data.type === ChatWebSocketDownstreamType.SESSION_READY;
export const isChatDownstreamMessageData = (data: ChatDownstreamData): data is ChatDownstreamMessageData => data.type === ChatWebSocketDownstreamType.MESSAGE;
export const isChatDownstreamTypingData = (data: ChatDownstreamData): data is ChatDownstreamTypingData => data.type === ChatWebSocketDownstreamType.TYPING;
export interface ChatBoxProps<T> {
userId: number;
conversationId: number;
handleSetConversationBarrier: () => void;
setDisplay: (displayMode: DisplayMode) => void;
navbar?: NavbarProps;
renderNavbar?: () => React.ReactNode;
// fetchHistory: (conversationId: number, stopIndex?: number) => Promise<Array<ReceivedMessage<T>>>;
// pullFunc: (conversationId: number, latestMsgIndex: number) => Promise<Array<ReceivedMessage<T>>>;
// askFunc: (conversationId: number, message: PendingMessage<T>) => Promise<ReceivedMessage<T>>;
renderMessageContent: (message: Message<T>) => React.ReactNode;
handleSend: (type: string, content: string) => T;
quickReplies?: QuickReplyItemProps[];
onQuickReplyClick?: ((item: QuickReplyItemProps, index: number) => void) | undefined;
}
export const ChatBox = <T,>(props: ChatBoxProps<T>): ReactElement => {
const {
conversationId, renderMessageContent, userId, handleSend,
quickReplies, onQuickReplyClick, navbar, renderNavbar, setDisplay, handleSetConversationBarrier,
} = props;
const [loading, setLoading] = useState<boolean>(true);
const askingMsgIndexRef = useRef(0);
const minIndexRef = useRef(-1);
const maxIndexRef = useRef(0);
const { current: sendingMessagesRecord } = useRef<Record<string, IPendingMessage<T>>>({});
const loadingHistoryPromiseRef = useRef<Promise<void> | undefined>(undefined);
const messagesRef = useRef<MessageContainerHandle>(null);
const { messages, prependMsgs, updateMsg, appendMsg, deleteMsg, resetList } = useMessages([]);
const { t } = useTranslation();
const [websocket, setWebsocket] = useState<SocketInterface | undefined>(undefined);
const typingMessageUuidRecordRef = useRef<Record<number, string>>({});
const { processSlashCommand, isSlashCommand } = useSlashCommand(handleSetConversationBarrier, setDisplay);
const convertToChatMessage = useCallback((item: ChatMessageProps): IReceivedMessage<T> => {
return {
_id: item.uuid,
uuid: item.uuid,
type: "RECEIVED",
index: item.msgIndex,
createdAt: item.dateCreated,
content: JSON.parse(item.content),
user: {
id: item.userId,
},
position: item.userId === userId ? "right" : "left",
};
}, [userId]);
const fetchHistory = useCallback(async (conversationId: number, stopIndex?: number, limit?: number): Promise<Array<IReceivedMessage<T>>> =>
listHistoricalChatMessages(conversationId, stopIndex, limit).then((res) => res.msgs.map(convertToChatMessage)),
[convertToChatMessage]);
const send = useCallback((message: IPendingMessage<T>): Promise<IReceivedMessage<T>> => {
return askAiAssistant(conversationId, "application/json", JSON.stringify(message.content), message.uuid)
.then(convertToChatMessage);
}, [conversationId, convertToChatMessage]);
const receiveMessages = useCallback((rawMessages: Array<ReceivedMessage<T>>): void => {
if (rawMessages.length === 0) {
return;
}
const messages: Array<IReceivedMessage<T>> = rawMessages.map(msg => ({
...msg,
_id: msg.uuid,
}));
messages.sort((a, b) => a.index - b.index);
let i = messages[0].index;
// validate the message is successive
for (const msg of messages) {
if (msg.index !== i) {
console.warn("invalid data", messages);
return;
}
i += 1;
}
// console.log(`Messages ${messages.map(msg => msg.index)} received, minIndex: ${minIndexRef.current}, maxIndex: ${maxIndexRef.current}`);
if (messages[messages.length - 1].index > askingMsgIndexRef.current) {
messages.forEach(msg => {
const typingMessageUuid = typingMessageUuidRecordRef.current[msg.user.id];
if (typingMessageUuid) {
deleteMsg(typingMessageUuid);
}
});
}
messages.forEach(message => {
const pendingMsg = sendingMessagesRecord[message.uuid];
if (pendingMsg) {
// TODO optimize
delete sendingMessagesRecord[message.uuid];
deleteMsg(message.uuid);
}
});
if (minIndexRef.current === -1) {
minIndexRef.current = messages[0].index;
maxIndexRef.current = messages[messages.length - 1].index;
resetList(messages);
messagesRef.current?.scrollToEnd();
// console.log(`Initial messages ${messages.map(msg => msg.index)}`);
return;
}
if (messages[messages.length - 1].index < minIndexRef.current - 1 || maxIndexRef.current < messages[0].index - 1) {
// invalid data
console.warn("Invalid data", minIndexRef.current, maxIndexRef.current, messages);
return;
}
let msgs = messages;
// prepend
if (msgs[0].index < minIndexRef.current) {
const splitPoint = msgs.findIndex(message => message.index === minIndexRef.current);
if (splitPoint === -1) {
prependMsgs(msgs);
minIndexRef.current = msgs[0].index;
// console.log(`Messages ${msgs.map(msg => msg.index)} prepended`);
return;
}
const prependMessages = msgs.slice(0, splitPoint);
prependMsgs(prependMessages);
minIndexRef.current = prependMessages[0].index;
// console.log(`Messages ${prependMessages.map(msg => msg.index)} prepended`);
msgs = msgs.slice(splitPoint);
}
// update
if (msgs[0].index <= maxIndexRef.current) {
const splitPoint = msgs.findIndex(message => message.index > maxIndexRef.current);
if (splitPoint === -1) {
msgs.forEach(message => updateMsg(message.uuid, message));
// console.log(`Messages ${msgs.map(msg => msg.index)} updated`);
return;
}
const updateMessages = msgs.slice(0, splitPoint);
updateMessages.forEach(message => updateMsg(message.uuid, message));
// console.log(`Messages ${updateMessages.map(msg => msg.index)} updated`);
msgs = msgs.slice(splitPoint);
}
// append
if (msgs.length > 0) {
maxIndexRef.current = msgs[msgs.length - 1].index;
msgs.forEach(message => appendMsg(message));
// console.log(`Messages ${msgs.map(msg => msg.index)} appended`);
}
}, [appendMsg, deleteMsg, prependMsgs, resetList, sendingMessagesRecord, updateMsg]);
const sendMessage = useCallback((content: T): void => {
const id = uuid();
const sendingMessage: IPendingMessage<T> = {
_id: id,
uuid: id,
content,
type: "PENDING",
status: "pending",
createdAt: Date.now(),
user: {
id: userId,
},
position: "right",
};
sendingMessagesRecord[sendingMessage.uuid] = sendingMessage;
appendMsg(sendingMessage);
send(sendingMessage)
.then((resp) => {
askingMsgIndexRef.current = resp.index;
receiveMessages([resp]);
})
.catch((e) => {
console.warn("Failed to ask", e);
const msg = sendingMessagesRecord[sendingMessage.uuid];
if (msg) {
msg.status = "fail";
}
updateMsg(sendingMessage.uuid, sendingMessage);
});
}, [userId, sendingMessagesRecord, appendMsg, send, receiveMessages, updateMsg]);
const hasMoreHistory = (): boolean => {
return minIndexRef.current > 1;
};
const loadMoreHistory = useCallback(async (force = false): Promise<void> => {
if (!force && !hasMoreHistory()) {
return;
}
if (loadingHistoryPromiseRef.current) {
return loadingHistoryPromiseRef.current;
}
setLoading(true);
loadingHistoryPromiseRef.current = fetchHistory(conversationId, minIndexRef.current > 0 ? minIndexRef.current : undefined)
.then(receiveMessages)
.finally(() => {
setLoading(false);
loadingHistoryPromiseRef.current = undefined;
});
await loadingHistoryPromiseRef.current;
}, [conversationId, fetchHistory, receiveMessages]);
const pullMessages = useCallback(async (): Promise<void> => {
try {
const resp = await pullChatMessages(conversationId, maxIndexRef.current)
.then((res) => Promise.all(res.msgs.map(convertToChatMessage)));
receiveMessages(resp);
} catch (e) {
console.error(e);
}
}, [conversationId, convertToChatMessage, receiveMessages]);
useEffect(() => {
const websocket = ReconnectableSocket(`${WEBSOCKET_SERVER_URL}/websocket/chat`);
setWebsocket(websocket);
return () => {
websocket.close();
};
}, []);
useEffect(() => {
const subscribe = (): void => {
websocket?.send(JSON.stringify({
conversationIds: [conversationId.toString()],
}));
};
const onMessage = (text: string): void => {
const data = JSON.parse(text);
if (isChatDownstreamReadyData(data)) {
subscribe();
}
if (isChatDownstreamMessageData(data)) {
if (data.payload.conversationId !== conversationId) {
return;
}
if (data.payload.type === 'NEW_MESSAGE') {
if (data.payload.message.msgIndex <= maxIndexRef.current) {
return;
}
if (data.payload.message.msgIndex === maxIndexRef.current + 1) {
// merge message if the message is the next message
receiveMessages([convertToChatMessage(data.payload.message)]);
} else {
// or pull messages if the message is not the next message
pullMessages();
}
}
if (data.payload.type === 'UPDATE_MESSAGE') {
fetchHistory(conversationId, data.payload.message.msgIndex + 1, 1).then(receiveMessages);
}
}
if (isChatDownstreamTypingData(data)) {
if (typingMessageUuidRecordRef.current[data.payload.userId]) {
deleteMsg(typingMessageUuidRecordRef.current[data.payload.userId]);
}
const typingMessageUuid = uuid();
const typingMessage: ISystemMessage = {
uuid: typingMessageUuid,
_id: typingMessageUuid,
type: "SYSTEM",
category: "typing",
createdAt: Date.now(),
position: "left",
user: {
id: data.payload.userId,
}
};
typingMessageUuidRecordRef.current[data.payload.userId] = typingMessageUuid;
appendMsg(typingMessage);
}
};
if (websocket) {
if (websocket.isConnected()) {
subscribe();
} else {
websocket.on(onMessage);
}
}
return () => {
websocket?.off(onMessage);
};
}, [appendMsg, conversationId, convertToChatMessage, deleteMsg, fetchHistory, pullMessages, receiveMessages, websocket]);
useEffect(() => {
loadMoreHistory(true);
// eslint-disable-next-line react-hooks/exhaustive-deps
}, []);
autoFocusTextarea("Composer-input");
return <Chat
messagesRef={messagesRef}
renderNavbar={renderNavbar}
navbar={navbar}
messages={messages}
renderMessageContent={(message: MessageProps) => renderMessageContent(message as IMessage<T>)}
onSend={(type, content) => {
if (isSlashCommand(content)) {
processSlashCommand(content);
} else {
sendMessage(handleSend(type, content));
}
}}
onRefresh={loadMoreHistory}
quickReplies={quickReplies}
onQuickReplyClick={onQuickReplyClick}
loadMoreText={loading ? t("assistant:Loading") : (hasMoreHistory() ? t("assistant:Load more") : t("assistant:No more"))}
placeholder={t("assistant:Type a message...")}
/>;
};
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