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This commit is contained in:
zhangyonghao
406
frontend/components/ChatPanel.tsx
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406
frontend/components/ChatPanel.tsx
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"use client";
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import { useCallback, useEffect, useRef, useState } from "react";
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import MarkdownMessage from "@/components/MarkdownMessage";
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import { sendChatMessage } from "@/lib/api";
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import {
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parseJsonSafely,
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splitSseEvents,
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type TencentErrorEvent,
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type TencentReplyEvent,
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} from "@/lib/tencentSse";
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import type { ChatMessage } from "@/types/mindmap";
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type TriggerRequest = {
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id: number;
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content: string;
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};
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type ChatPanelProps = {
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sessionId: string;
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triggerRequest?: TriggerRequest;
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onClose?: () => void;
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};
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const TYPING_INTERVAL_MS = 24;
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export default function ChatPanel({
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sessionId,
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triggerRequest,
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onClose,
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}: ChatPanelProps) {
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const [messages, setMessages] = useState<ChatMessage[]>([]);
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const [input, setInput] = useState("");
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const [loading, setLoading] = useState(false);
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const messagesEndRef = useRef<HTMLDivElement>(null);
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const typingTimerRef = useRef<number | null>(null);
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const pendingCleanupTimerRef = useRef<number | null>(null);
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const abortControllerRef = useRef<AbortController | null>(null);
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const assistantTargetRef = useRef("");
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const assistantDisplayedRef = useRef("");
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const streamCompleteRef = useRef(false);
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const handledTriggerIdRef = useRef<number | null>(null);
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const scrollToBottom = useCallback(() => {
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messagesEndRef.current?.scrollIntoView({
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behavior: loading ? "auto" : "smooth",
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block: "end",
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});
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}, [loading]);
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useEffect(() => {
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scrollToBottom();
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}, [messages, scrollToBottom]);
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const cancelPendingCleanup = useCallback(() => {
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if (pendingCleanupTimerRef.current !== null) {
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window.clearTimeout(pendingCleanupTimerRef.current);
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pendingCleanupTimerRef.current = null;
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}
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}, []);
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const abortInFlightRequest = useCallback(() => {
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abortControllerRef.current?.abort();
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abortControllerRef.current = null;
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}, []);
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const updateAssistantMessage = useCallback((content: string) => {
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setMessages((prev) => {
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const next = [...prev];
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const lastMessage = next[next.length - 1];
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if (!lastMessage || lastMessage.role !== "assistant") {
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next.push({ role: "assistant", content });
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return next;
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}
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next[next.length - 1] = {
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...lastMessage,
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content,
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};
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return next;
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});
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}, []);
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const stopTypingAnimation = useCallback(() => {
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if (typingTimerRef.current !== null) {
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window.clearInterval(typingTimerRef.current);
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typingTimerRef.current = null;
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}
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}, []);
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const getTypingStep = useCallback((remaining: number) => {
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if (remaining > 160) return 10;
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if (remaining > 80) return 7;
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if (remaining > 36) return 4;
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if (remaining > 12) return 2;
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return 1;
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}, []);
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const ensureTypingAnimation = useCallback(() => {
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if (typingTimerRef.current !== null) {
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return;
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}
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typingTimerRef.current = window.setInterval(() => {
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const current = assistantDisplayedRef.current;
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const target = assistantTargetRef.current;
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if (current === target) {
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if (streamCompleteRef.current) {
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stopTypingAnimation();
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}
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return;
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}
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const remaining = target.length - current.length;
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const nextLength = current.length + getTypingStep(remaining);
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const nextContent = target.slice(0, nextLength);
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assistantDisplayedRef.current = nextContent;
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updateAssistantMessage(nextContent);
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if (nextContent === target && streamCompleteRef.current) {
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stopTypingAnimation();
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}
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}, TYPING_INTERVAL_MS);
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}, [getTypingStep, stopTypingAnimation, updateAssistantMessage]);
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useEffect(() => {
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cancelPendingCleanup();
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return () => {
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pendingCleanupTimerRef.current = window.setTimeout(() => {
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abortInFlightRequest();
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stopTypingAnimation();
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pendingCleanupTimerRef.current = null;
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}, 0);
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};
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}, [abortInFlightRequest, cancelPendingCleanup, stopTypingAnimation]);
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const resetStreamingState = useCallback(() => {
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cancelPendingCleanup();
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abortInFlightRequest();
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stopTypingAnimation();
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assistantTargetRef.current = "";
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assistantDisplayedRef.current = "";
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streamCompleteRef.current = false;
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}, [abortInFlightRequest, cancelPendingCleanup, stopTypingAnimation]);
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const mergeIncomingContent = useCallback((currentTarget: string, incomingContent: string) => {
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if (!currentTarget) {
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return incomingContent;
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}
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if (!incomingContent) {
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return currentTarget;
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}
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if (incomingContent.startsWith(currentTarget)) {
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return incomingContent;
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}
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if (currentTarget.startsWith(incomingContent)) {
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return currentTarget;
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}
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const maxOverlap = Math.min(currentTarget.length, incomingContent.length);
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for (let overlap = maxOverlap; overlap > 0; overlap -= 1) {
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if (currentTarget.slice(-overlap) === incomingContent.slice(0, overlap)) {
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return `${currentTarget}${incomingContent.slice(overlap)}`;
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}
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}
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return incomingContent.length > currentTarget.length ? incomingContent : currentTarget;
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}, []);
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const setAssistantTarget = useCallback(
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(incomingContent: string) => {
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assistantTargetRef.current = mergeIncomingContent(
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assistantTargetRef.current,
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incomingContent,
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);
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ensureTypingAnimation();
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},
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[ensureTypingAnimation, mergeIncomingContent],
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);
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const processStreamResponse = useCallback(
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async (response: Response) => {
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const reader = response.body?.getReader();
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if (!reader) {
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throw new Error("No response body");
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}
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const decoder = new TextDecoder("utf-8");
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let buffer = "";
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const handleReplyEvent = (event: TencentReplyEvent | null) => {
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const payload = event?.payload;
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if (!payload || payload.is_from_self || typeof payload.content !== "string") {
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return;
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}
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setAssistantTarget(payload.content);
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if (payload.is_final) {
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streamCompleteRef.current = true;
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ensureTypingAnimation();
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}
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};
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const handleErrorEvent = (event: TencentErrorEvent | null) => {
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const errorMessage =
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event?.error?.message ?? event?.message ?? "Unknown streaming error";
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assistantTargetRef.current = `错误: ${errorMessage}`;
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assistantDisplayedRef.current = assistantTargetRef.current;
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streamCompleteRef.current = true;
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updateAssistantMessage(assistantTargetRef.current);
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stopTypingAnimation();
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};
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const handleSseEvent = (eventName: string, data: string) => {
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const normalizedEventName =
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parseJsonSafely<{ type?: string }>(data)?.type ?? eventName;
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if (normalizedEventName === "reply") {
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handleReplyEvent(parseJsonSafely<TencentReplyEvent>(data));
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return;
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}
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if (normalizedEventName === "error") {
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handleErrorEvent(parseJsonSafely<TencentErrorEvent>(data));
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}
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};
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while (true) {
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const { done, value } = await reader.read();
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if (done) {
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buffer += decoder.decode();
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} else {
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buffer += decoder.decode(value, { stream: true });
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}
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const { events, rest } = splitSseEvents(buffer);
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buffer = rest;
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for (const event of events) {
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handleSseEvent(event.event, event.data);
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}
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if (done) {
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if (buffer.trim()) {
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const { events: tailEvents } = splitSseEvents(`${buffer}\n\n`);
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for (const event of tailEvents) {
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handleSseEvent(event.event, event.data);
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}
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}
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streamCompleteRef.current = true;
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ensureTypingAnimation();
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break;
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}
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}
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},
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[ensureTypingAnimation, setAssistantTarget, stopTypingAnimation, updateAssistantMessage],
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);
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const sendMessage = useCallback(
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async (content: string) => {
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if (!content.trim() || loading) return;
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resetStreamingState();
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const abortController = new AbortController();
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abortControllerRef.current = abortController;
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const userMessage: ChatMessage = { role: "user", content };
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const assistantMessage: ChatMessage = { role: "assistant", content: "" };
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setMessages((prev) => [...prev, userMessage, assistantMessage]);
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setInput("");
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setLoading(true);
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try {
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const response = await sendChatMessage(
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sessionId,
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content,
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"default_visitor",
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abortController.signal,
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);
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await processStreamResponse(response);
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} catch (err) {
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if (err instanceof DOMException && err.name === "AbortError") {
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return;
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}
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const errorMessage = err instanceof Error ? err.message : "请求失败";
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assistantTargetRef.current = `错误: ${errorMessage}`;
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assistantDisplayedRef.current = assistantTargetRef.current;
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streamCompleteRef.current = true;
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updateAssistantMessage(assistantTargetRef.current);
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stopTypingAnimation();
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} finally {
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if (abortControllerRef.current === abortController) {
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abortControllerRef.current = null;
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}
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setLoading(false);
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}
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},
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[loading, processStreamResponse, resetStreamingState, sessionId, stopTypingAnimation, updateAssistantMessage],
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);
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useEffect(() => {
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if (!triggerRequest) {
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return;
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}
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if (handledTriggerIdRef.current === triggerRequest.id) {
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return;
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}
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handledTriggerIdRef.current = triggerRequest.id;
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void sendMessage(triggerRequest.content);
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}, [triggerRequest, sendMessage]);
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const handleSend = useCallback(async () => {
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await sendMessage(input);
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}, [input, sendMessage]);
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const handleKeyDown = useCallback(
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(e: React.KeyboardEvent<HTMLTextAreaElement>) => {
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if (e.key === "Enter" && !e.shiftKey) {
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e.preventDefault();
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void handleSend();
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}
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},
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[handleSend],
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);
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return (
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<div className="flex h-full min-h-0 w-full flex-col bg-slate-50">
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<div className="flex items-center justify-between border-b border-slate-200 px-4 py-3">
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<h2 className="text-sm font-semibold text-slate-700">AI 对话</h2>
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{onClose ? (
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<button
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type="button"
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onClick={onClose}
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className="rounded-lg border border-slate-200 bg-white px-3 py-1.5 text-sm font-medium text-slate-600 transition-colors hover:border-slate-300 hover:text-slate-900"
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>
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关闭
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</button>
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) : null}
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</div>
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<div className="flex-1 min-h-0 space-y-3 overflow-y-auto px-4 py-4">
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{messages.length === 0 && (
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<div className="flex h-full items-center justify-center">
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<p className="text-sm text-slate-400">双击思维导图节点开始对话</p>
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</div>
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)}
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{messages.map((msg, idx) => (
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<div
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key={idx}
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className={`flex ${msg.role === "user" ? "justify-end" : "justify-start"}`}
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>
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<div
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className={`max-w-[85%] rounded-2xl px-4 py-2.5 text-sm leading-relaxed ${
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msg.role === "user"
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? "bg-blue-600 text-white"
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: "border border-slate-100 bg-white text-slate-700 shadow-sm"
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}`}
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>
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{msg.role === "assistant" ? (
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msg.content || (loading && idx === messages.length - 1 ? "思考中..." : "") ? (
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<MarkdownMessage
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content={msg.content || (loading && idx === messages.length - 1 ? "思考中..." : "")}
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/>
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) : null
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) : (
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<div className="whitespace-pre-wrap break-words">{msg.content}</div>
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)}
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</div>
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</div>
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))}
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<div ref={messagesEndRef} />
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</div>
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<div className="border-t border-slate-200 px-4 py-3">
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<div className="flex items-end gap-2">
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<textarea
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value={input}
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onChange={(e) => setInput(e.target.value)}
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onKeyDown={handleKeyDown}
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placeholder="输入消息..."
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rows={1}
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className="flex-1 resize-none rounded-xl border border-slate-200 bg-white px-4 py-2.5 text-sm text-slate-700 placeholder-slate-400 outline-none focus:border-blue-400 focus:ring-1 focus:ring-blue-400"
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/>
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<button
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onClick={() => void handleSend()}
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disabled={loading || !input.trim()}
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className="rounded-xl bg-blue-600 px-4 py-2.5 text-sm font-medium text-white transition-colors hover:bg-blue-700 disabled:cursor-not-allowed disabled:opacity-50"
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>
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发送
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</button>
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</div>
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</div>
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</div>
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);
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}
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Reference in New Issue
Block a user