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import { create } from "zustand";
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import { persist } from "zustand/middleware";
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import { type ChatCompletionResponseMessage } from "openai";
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import { requestChat, requestChatStream, requestWithPrompt } from "./requests";
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import { trimTopic } from "./utils";
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export type Message = ChatCompletionResponseMessage & {
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date: string;
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streaming?: boolean;
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};
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export enum SubmitKey {
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Enter = "Enter",
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CtrlEnter = "Ctrl + Enter",
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ShiftEnter = "Shift + Enter",
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AltEnter = "Alt + Enter",
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}
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export enum Theme {
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Auto = "auto",
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Dark = "dark",
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Light = "light",
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}
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export interface ChatConfig {
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maxToken?: number
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historyMessageCount: number; // -1 means all
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compressMessageLengthThreshold: number;
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sendBotMessages: boolean; // send bot's message or not
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submitKey: SubmitKey;
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avatar: string;
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theme: Theme;
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tightBorder: boolean;
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}
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const DEFAULT_CONFIG: ChatConfig = {
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historyMessageCount: 4,
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compressMessageLengthThreshold: 1000,
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sendBotMessages: true as boolean,
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submitKey: SubmitKey.CtrlEnter as SubmitKey,
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avatar: "1f603",
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theme: Theme.Auto as Theme,
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tightBorder: false,
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};
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export interface ChatStat {
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tokenCount: number;
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wordCount: number;
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charCount: number;
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}
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export interface ChatSession {
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id: number;
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topic: string;
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memoryPrompt: string;
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messages: Message[];
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stat: ChatStat;
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lastUpdate: string;
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lastSummarizeIndex: number;
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}
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const DEFAULT_TOPIC = "新的聊天";
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function createEmptySession(): ChatSession {
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const createDate = new Date().toLocaleString();
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return {
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id: Date.now(),
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topic: DEFAULT_TOPIC,
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memoryPrompt: "",
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messages: [
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{
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role: "assistant",
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content: "有什么可以帮你的吗",
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date: createDate,
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},
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],
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stat: {
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tokenCount: 0,
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wordCount: 0,
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charCount: 0,
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},
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lastUpdate: createDate,
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lastSummarizeIndex: 0,
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};
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}
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interface ChatStore {
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config: ChatConfig;
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sessions: ChatSession[];
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currentSessionIndex: number;
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removeSession: (index: number) => void;
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selectSession: (index: number) => void;
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newSession: () => void;
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currentSession: () => ChatSession;
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onNewMessage: (message: Message) => void;
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onUserInput: (content: string) => Promise<void>;
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summarizeSession: () => void;
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updateStat: (message: Message) => void;
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updateCurrentSession: (updater: (session: ChatSession) => void) => void;
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updateMessage: (
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sessionIndex: number,
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messageIndex: number,
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updater: (message?: Message) => void
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) => void;
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getMessagesWithMemory: () => Message[];
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getMemoryPrompt: () => Message,
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getConfig: () => ChatConfig;
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resetConfig: () => void;
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updateConfig: (updater: (config: ChatConfig) => void) => void;
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clearAllData: () => void;
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}
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const LOCAL_KEY = "chat-next-web-store";
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export const useChatStore = create<ChatStore>()(
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persist(
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(set, get) => ({
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sessions: [createEmptySession()],
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currentSessionIndex: 0,
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config: {
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...DEFAULT_CONFIG,
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},
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resetConfig() {
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set(() => ({ config: { ...DEFAULT_CONFIG } }));
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},
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getConfig() {
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return get().config;
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},
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updateConfig(updater) {
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const config = get().config;
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updater(config);
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set(() => ({ config }));
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},
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selectSession(index: number) {
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set({
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currentSessionIndex: index,
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});
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},
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removeSession(index: number) {
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set((state) => {
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let nextIndex = state.currentSessionIndex;
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const sessions = state.sessions;
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if (sessions.length === 1) {
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return {
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currentSessionIndex: 0,
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sessions: [createEmptySession()],
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};
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}
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sessions.splice(index, 1);
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if (nextIndex === index) {
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nextIndex -= 1;
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}
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return {
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currentSessionIndex: nextIndex,
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sessions,
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};
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});
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},
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newSession() {
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set((state) => ({
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currentSessionIndex: 0,
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sessions: [createEmptySession()].concat(state.sessions),
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}));
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},
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currentSession() {
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let index = get().currentSessionIndex;
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const sessions = get().sessions;
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if (index < 0 || index >= sessions.length) {
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index = Math.min(sessions.length - 1, Math.max(0, index));
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set(() => ({ currentSessionIndex: index }));
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}
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const session = sessions[index];
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return session;
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},
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onNewMessage(message) {
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get().updateCurrentSession(session => {
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session.lastUpdate = new Date().toLocaleString()
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})
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get().updateStat(message);
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get().summarizeSession();
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},
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async onUserInput(content) {
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const userMessage: Message = {
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role: "user",
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content,
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date: new Date().toLocaleString(),
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};
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const botMessage: Message = {
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content: "",
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role: "assistant",
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date: new Date().toLocaleString(),
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streaming: true,
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};
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// get recent messages
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const recentMessages = get().getMessagesWithMemory()
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const sendMessages = recentMessages.concat(userMessage)
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// save user's and bot's message
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get().updateCurrentSession((session) => {
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session.messages.push(userMessage);
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session.messages.push(botMessage);
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});
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console.log('[User Input] ', sendMessages)
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requestChatStream(sendMessages, {
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onMessage(content, done) {
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if (done) {
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botMessage.streaming = false;
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get().onNewMessage(botMessage)
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} else {
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botMessage.content = content;
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set(() => ({}));
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}
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},
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onError(error) {
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botMessage.content += "\n\n出错了，稍后重试吧";
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botMessage.streaming = false;
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set(() => ({}));
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},
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filterBot: !get().config.sendBotMessages,
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});
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},
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getMemoryPrompt() {
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const session = get().currentSession()
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return {
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role: 'system',
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content: '这是 ai 和用户的历史聊天总结作为前情提要：' + session.memoryPrompt,
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date: ''
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} as Message
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},
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getMessagesWithMemory() {
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const session = get().currentSession()
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const config = get().config
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const n = session.messages.length
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const recentMessages = session.messages.slice(n - config.historyMessageCount);
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const memoryPrompt = get().getMemoryPrompt()
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if (session.memoryPrompt) {
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recentMessages.unshift(memoryPrompt)
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}
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return recentMessages
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},
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updateMessage(
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sessionIndex: number,
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messageIndex: number,
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updater: (message?: Message) => void
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) {
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const sessions = get().sessions;
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const session = sessions.at(sessionIndex);
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const messages = session?.messages;
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updater(messages?.at(messageIndex));
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set(() => ({ sessions }));
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},
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summarizeSession() {
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const session = get().currentSession();
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if (session.topic === DEFAULT_TOPIC && session.messages.length >= 3) {
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// should summarize topic
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requestWithPrompt(
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session.messages,
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"直接返回这句话的简要主题，不要解释，如果没有主题，请直接返回“闲聊”"
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).then((res) => {
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get().updateCurrentSession(
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(session) => (session.topic = trimTopic(res))
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);
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});
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}
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const config = get().config
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let toBeSummarizedMsgs = session.messages.slice(session.lastSummarizeIndex)
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const historyMsgLength = toBeSummarizedMsgs.reduce((pre, cur) => pre + cur.content.length, 0)
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if (historyMsgLength > 4000) {
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toBeSummarizedMsgs = toBeSummarizedMsgs.slice(-config.historyMessageCount)
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}
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// add memory prompt
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toBeSummarizedMsgs.unshift(get().getMemoryPrompt())
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const lastSummarizeIndex = session.messages.length
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console.log('[Chat History] ', toBeSummarizedMsgs, historyMsgLength, config.compressMessageLengthThreshold)
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if (historyMsgLength > config.compressMessageLengthThreshold) {
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requestChatStream(toBeSummarizedMsgs.concat({
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role: 'system',
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content: '简要总结一下你和用户的对话，用作后续的上下文提示 prompt，控制在 50 字以内',
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date: ''
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}), {
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filterBot: false,
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onMessage(message, done) {
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session.memoryPrompt = message
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if (done) {
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console.log('[Memory] ', session.memoryPrompt)
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session.lastSummarizeIndex = lastSummarizeIndex
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}
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},
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onError(error) {
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console.error('[Summarize] ', error)
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},
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})
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}
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},
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updateStat(message) {
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get().updateCurrentSession((session) => {
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session.stat.charCount += message.content.length;
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// TODO: should update chat count and word count
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});
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},
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updateCurrentSession(updater) {
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const sessions = get().sessions;
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const index = get().currentSessionIndex;
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updater(sessions[index]);
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set(() => ({ sessions }));
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},
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clearAllData() {
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if (confirm('确认清除所有聊天、设置数据？')) {
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localStorage.clear()
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location.reload()
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}
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},
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}),
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{
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name: LOCAL_KEY,
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}
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)
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);
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