Add chat history sidebar with restore across reloads
Chat messages previously lived only in React state and vanished on navigation or refresh. Persist each conversation as a session in localStorage and add a sidebar to switch between, restore, or delete past chats, matching the pattern of the account page's client-side persistence. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_012RrMZ8Y9BhuMkKNcw2bakZ
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1 file changed
+200
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+200
-19
@@ -2,6 +2,8 @@ import { useEffect, useRef, useState } from 'react';
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import { Nav } from '~/components/nav';
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const API_URL = import.meta.env.VITE_API_URL ?? 'https://api.t4t-gateway.com';
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const SESSIONS_KEY = 't4t:chatSessions';
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const ACTIVE_SESSION_KEY = 't4t:activeChatId';
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type Model = { id: string; object: 'model'; created: number; owned_by: string };
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type Message = { role: 'user' | 'assistant' | 'system'; content: string };
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@@ -11,6 +13,13 @@ type Completion = {
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choices: { index: number; message: ChoiceMessage; finish_reason: string }[];
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usage?: { prompt_tokens: number; completion_tokens: number; total_tokens: number };
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};
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type ChatSession = {
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id: string;
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title: string;
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model: string;
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messages: Message[];
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updatedAt: number;
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};
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export function meta() {
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return [{ title: 'Chat · t4t Gateway' }];
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@@ -37,9 +46,41 @@ async function api<T>(path: string, init: RequestInit = {}): Promise<T> {
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return body as T;
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}
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function newSessionId(): string {
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return typeof crypto !== 'undefined' && 'randomUUID' in crypto
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? crypto.randomUUID()
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: `${Date.now()}-${Math.random().toString(36).slice(2)}`;
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}
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function titleFor(messages: Message[]): string {
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const firstUser = messages.find((m) => m.role === 'user');
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if (!firstUser) return 'New chat';
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const text = firstUser.content.trim().replace(/\s+/g, ' ');
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if (!text) return 'New chat';
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return text.length > 40 ? `${text.slice(0, 40)}…` : text;
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}
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function loadSessions(): ChatSession[] {
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if (typeof window === 'undefined') return [];
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try {
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const raw = localStorage.getItem(SESSIONS_KEY);
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const parsed = raw ? JSON.parse(raw) : [];
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return Array.isArray(parsed) ? parsed : [];
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} catch {
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return [];
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}
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}
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function saveSessions(sessions: ChatSession[]) {
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if (typeof window === 'undefined') return;
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localStorage.setItem(SESSIONS_KEY, JSON.stringify(sessions));
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}
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export default function Chat() {
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const [models, setModels] = useState<Model[]>([]);
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const [model, setModel] = useState<string>('');
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const [sessions, setSessions] = useState<ChatSession[]>([]);
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const [activeId, setActiveId] = useState<string | null>(null);
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const [messages, setMessages] = useState<Message[]>([]);
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const [input, setInput] = useState('');
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const [sending, setSending] = useState(false);
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@@ -53,11 +94,39 @@ export default function Chat() {
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window.location.href = '/login';
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return;
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}
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const stored = loadSessions();
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const storedActiveId = localStorage.getItem(ACTIVE_SESSION_KEY);
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const initial =
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stored.find((s) => s.id === storedActiveId) ??
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[...stored].sort((a, b) => b.updatedAt - a.updatedAt)[0] ??
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null;
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if (initial) {
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setSessions(stored);
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setActiveId(initial.id);
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setMessages(initial.messages);
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setModel(initial.model);
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localStorage.setItem(ACTIVE_SESSION_KEY, initial.id);
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} else {
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const fresh: ChatSession = {
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id: newSessionId(),
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title: 'New chat',
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model: '',
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messages: [],
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updatedAt: Date.now(),
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};
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setSessions([fresh]);
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setActiveId(fresh.id);
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saveSessions([fresh]);
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localStorage.setItem(ACTIVE_SESSION_KEY, fresh.id);
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}
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(async () => {
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try {
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const list = await api<{ data: Model[] }>('/v1/models');
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setModels(list.data);
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if (list.data.length > 0) setModel(list.data[0].id);
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setModel((current) => current || (list.data.length > 0 ? list.data[0].id : ''));
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} catch (err) {
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setError(err instanceof Error ? err.message : 'Unknown error');
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} finally {
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@@ -72,13 +141,85 @@ export default function Chat() {
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}
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}, [messages]);
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function persist(id: string, mdl: string, msgs: Message[]) {
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setSessions((prev) => {
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const updated = prev.map((s) =>
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s.id === id ? { ...s, model: mdl, messages: msgs, title: titleFor(msgs), updatedAt: Date.now() } : s
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);
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saveSessions(updated);
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return updated;
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});
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}
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function selectSession(id: string) {
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const session = sessions.find((s) => s.id === id);
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if (!session) return;
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setActiveId(id);
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setMessages(session.messages);
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setModel(session.model || model);
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setError(null);
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localStorage.setItem(ACTIVE_SESSION_KEY, id);
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}
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function newChat() {
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const fresh: ChatSession = {
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id: newSessionId(),
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title: 'New chat',
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model,
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messages: [],
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updatedAt: Date.now(),
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};
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setSessions((prev) => {
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const updated = [fresh, ...prev];
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saveSessions(updated);
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return updated;
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});
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setActiveId(fresh.id);
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setMessages([]);
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setError(null);
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localStorage.setItem(ACTIVE_SESSION_KEY, fresh.id);
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}
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function deleteSession(id: string) {
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setSessions((prev) => {
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const updated = prev.filter((s) => s.id !== id);
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saveSessions(updated);
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if (id === activeId) {
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const next = [...updated].sort((a, b) => b.updatedAt - a.updatedAt)[0];
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if (next) {
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setActiveId(next.id);
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setMessages(next.messages);
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setModel(next.model || model);
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localStorage.setItem(ACTIVE_SESSION_KEY, next.id);
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} else {
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const fresh: ChatSession = {
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id: newSessionId(),
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title: 'New chat',
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model,
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messages: [],
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updatedAt: Date.now(),
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};
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updated.push(fresh);
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saveSessions(updated);
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setActiveId(fresh.id);
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setMessages([]);
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localStorage.setItem(ACTIVE_SESSION_KEY, fresh.id);
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}
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}
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return updated;
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});
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}
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async function send(e: React.FormEvent) {
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e.preventDefault();
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if (!input.trim() || !model || sending) return;
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if (!input.trim() || !model || sending || !activeId) return;
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setError(null);
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const userMsg: Message = { role: 'user', content: input };
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const next = [...messages, userMsg];
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setMessages(next);
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persist(activeId, model, next);
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setInput('');
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setSending(true);
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try {
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@@ -88,7 +229,9 @@ export default function Chat() {
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});
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const reply = completion.choices[0]?.message;
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if (reply) {
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setMessages([...next, { role: reply.role, content: reply.content }]);
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const withReply = [...next, { role: reply.role, content: reply.content }];
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setMessages(withReply);
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persist(activeId, model, withReply);
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} else {
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throw new Error('No reply from model');
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}
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@@ -99,15 +242,20 @@ export default function Chat() {
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}
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}
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const sortedSessions = [...sessions].sort((a, b) => b.updatedAt - a.updatedAt);
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return (
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<main className='flex min-h-screen flex-col'>
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<main className='flex h-screen flex-col'>
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<Nav />
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<div className='border-b border-neutral-200 bg-white px-6 py-2'>
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<div className='mx-auto flex max-w-3xl items-center justify-end'>
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<div className='mx-auto flex max-w-5xl items-center justify-end'>
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<select
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aria-label='Model'
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value={model}
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onChange={(e) => setModel(e.target.value)}
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onChange={(e) => {
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setModel(e.target.value);
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if (activeId) persist(activeId, e.target.value, messages);
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}}
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disabled={loadingModels || models.length === 0}
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className='rounded-md border border-neutral-300 bg-white px-2 py-1 text-sm shadow-sm focus:border-neutral-900 focus:outline-none focus:ring-1 focus:ring-neutral-900'
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>
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@@ -122,10 +270,48 @@ export default function Chat() {
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</div>
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</div>
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<div
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ref={scrollRef}
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className='mx-auto w-full max-w-3xl flex-1 overflow-y-auto px-6 py-6'
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<div className='mx-auto flex w-full max-w-5xl flex-1 overflow-hidden'>
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<aside className='hidden w-64 shrink-0 flex-col border-r border-neutral-200 bg-white sm:flex'>
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<div className='p-3'>
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<button
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onClick={newChat}
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className='inline-flex h-9 w-full items-center justify-center rounded-md bg-neutral-900 px-3 text-sm font-medium text-white hover:bg-neutral-700'
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>
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New chat
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</button>
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</div>
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<ul className='flex-1 space-y-1 overflow-y-auto px-2 pb-3'>
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{sortedSessions.map((s) => (
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<li key={s.id} className='group flex items-center'>
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<button
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onClick={() => selectSession(s.id)}
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className={`flex-1 truncate rounded-md px-3 py-2 text-left text-sm ${
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s.id === activeId
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? 'bg-neutral-900 text-white'
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: 'text-neutral-700 hover:bg-neutral-100'
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}`}
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title={s.title}
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>
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{s.title}
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</button>
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<button
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onClick={() => deleteSession(s.id)}
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aria-label={`Delete chat: ${s.title}`}
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className={`ml-1 hidden shrink-0 rounded-md px-2 py-2 text-xs group-hover:block ${
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s.id === activeId
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? 'text-neutral-300 hover:text-white'
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: 'text-neutral-400 hover:text-neutral-900'
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}`}
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>
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✕
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</button>
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</li>
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))}
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</ul>
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</aside>
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<div className='flex min-w-0 flex-1 flex-col'>
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<div ref={scrollRef} className='mx-auto w-full max-w-3xl flex-1 overflow-y-auto px-6 py-6'>
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{messages.length === 0 && (
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<p className='text-center text-sm text-neutral-500'>
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Pick a model and send a message to start.
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@@ -135,9 +321,7 @@ export default function Chat() {
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{messages.map((m, i) => (
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<li
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key={i}
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className={
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m.role === 'user' ? 'flex justify-end' : 'flex justify-start'
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}
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className={m.role === 'user' ? 'flex justify-end' : 'flex justify-start'}
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>
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<div
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className={
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@@ -161,15 +345,10 @@ export default function Chat() {
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</div>
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{error && (
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<p className='mx-auto w-full max-w-3xl px-6 pb-2 text-sm text-red-700'>
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{error}
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</p>
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<p className='mx-auto w-full max-w-3xl px-6 pb-2 text-sm text-red-700'>{error}</p>
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)}
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<form
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onSubmit={send}
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className='border-t border-neutral-200 bg-white px-6 py-3'
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>
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<form onSubmit={send} className='border-t border-neutral-200 bg-white px-6 py-3'>
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<div className='mx-auto flex max-w-3xl gap-2'>
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<input
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type='text'
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@@ -188,6 +367,8 @@ export default function Chat() {
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</button>
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</div>
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</form>
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</div>
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</div>
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</main>
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);
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}
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