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type ShellStatus = ReturnType<typeof useShellSession>["status"];
// Mounted memory only. No transcript or draft is cached across route changes.const positions = new Map< string, { top: number; pinned: boolean; count: number }>();function ConversationContent({ id, name, shell,}: { id: string; name: string; shell: ShellStatus;}) { const [session] = useState(() => new ConversationSession(id)); const view = useSyncExternalStore( session.subscribe, session.getSnapshot, session.getServerSnapshot, ); const [draft, setDraft] = useState(""); const [count, setCount] = useState(40); const [pinned, setPinned] = useState(true); const scroller = useRef<HTMLDivElement | null>(null); const content = useRef<HTMLDivElement | null>(null); const follow = useRef(true); const scrollJob = useRef<number | null>(null); const restored = useRef(false); const restorePosition = useRef<{ top: number; pinned: boolean } | undefined>( undefined, ); const latestCount = useRef(count); latestCount.current = count; const anchor = useRef<{ id: string; top: number } | null>(null); const scheduleScroll = () => { if (scrollJob.current !== null) cancelAnimationFrame(scrollJob.current); scrollJob.current = requestAnimationFrame(() => { scrollJob.current = null; if ( !restored.current && scroller.current && content.current?.querySelector("[data-message-id]") ) { restored.current = true; const saved = restorePosition.current; if (saved && !saved.pinned) { scroller.current.scrollTop = saved.top; return; } } const preserved = anchor.current; if (preserved && scroller.current) { const row = content.current?.querySelector<HTMLElement>( `[data-message-id="${CSS.escape(preserved.id)}"]`, ); if (row) scroller.current.scrollTop += row.getBoundingClientRect().top - preserved.top; anchor.current = null; } else if (follow.current && scroller.current) scroller.current.scrollTop = scroller.current.scrollHeight; }); }; useEffect(() => { session.start(); const saved = positions.get(id); restorePosition.current = saved; if (saved) { follow.current = saved.pinned; setPinned(saved.pinned); setCount(saved.count); } const resize = new ResizeObserver(scheduleScroll); if (content.current) resize.observe(content.current); return () => { positions.set(id, { top: scroller.current?.scrollTop ?? positions.get(id)?.top ?? 0, pinned: follow.current, count: latestCount.current, }); if (positions.size > 30) positions.delete(positions.keys().next().value!); resize.disconnect(); if (scrollJob.current !== null) cancelAnimationFrame(scrollJob.current); session.close(); }; }, [session]); useEffect(() => { if (!view.messages.length) return; scheduleScroll(); }, [view.messages, count]); useEffect(() => { if (view.connection === "signed-out" || view.connection === "missing") { setDraft(""); positions.delete(id); } }, [view.connection]); const previousShell = useRef(shell); useEffect(() => { const was = previousShell.current; previousShell.current = shell; // Signing back in through the shell also recovers a signed-out conversation. if ( shell === "connected" && was !== "connected" && view.connection === "signed-out" ) session.reconnect(); }, [shell]); const busy = view.status === "submitted" || view.status === "streaming" || view.serverStreaming || view.recovering || view.stopping; const ready = view.connection === "connected" && !view.reconciling; const configuration = view.modelSelection ?? view.modelSettings?.configuration; const providerReady = (provider: ModelProvider) => Boolean( view.modelSettings?.providers[provider] && (!isCredentialProvider(provider) || view.modelSettings.credentials[provider] === "configured"), ); const modelReady = !!configuration && providerReady(configuration.provider); const jump = () => { follow.current = true; setPinned(true); scheduleScroll(); }; const earlier = Math.max(0, view.messages.length - count); const terminal = view.connection === "signed-out" || view.connection === "missing"; return ( <main className="conversation-page" aria-label="Conversation"> <div className="conversation-heading"> <h1> {view.connection === "missing" ? "Conversation not found" : terminal ? "Conversation" : name} </h1> <p className="muted" role="status"> {view.stopping ? "Stopping…" : view.recovering ? "Recovering saved progress…" : view.connection === "loading" ? "Loading conversation…" : view.connection === "offline" ? "Reconnecting…" : view.reconciling ? "Checking saved progress…" : busy ? "Flarebot is working…" : view.connection === "connected" ? "Connected" : ""} </p> </div> {view.notice ? ( <div className="chat-notice" role={terminal || view.error ? "alert" : "status"} > <p>{view.notice}</p> {!busy ? ( <Button size="sm" variant="secondary" onClick={session.reconnect}> Reconnect </Button> ) : null} </div> ) : null} <div className="chat-scroll" ref={scroller} onScroll={() => { const element = scroller.current; if (!element) return; const near = element.scrollHeight - element.scrollTop - element.clientHeight < 64; follow.current = near; setPinned(near); positions.set(id, { top: element.scrollTop, pinned: near, count }); }} > <div className="chat-transcript" ref={content}> {earlier > 0 ? ( <Button variant="secondary" onClick={() => { const row = content.current?.querySelector<HTMLElement>( "[data-message-id]", ); if (row) anchor.current = { id: row.dataset.messageId!, top: row.getBoundingClientRect().top, }; follow.current = false; setPinned(false); setCount(count + 40); }} > Load earlier messages ({earlier}) </Button> ) : null} {!view.messages.length && view.connection === "connected" && !view.reconciling ? ( <div className="chat-welcome"> <h2>How can I help?</h2> <p> Ask a question, research a topic, or schedule something for later. </p> </div> ) : null} <ShikiProvider engine="javascript" languages={[ "javascript", "typescript", "json", "bash", "python", "html", "css", "sql", ]} > {view.messages.slice(earlier).map((message) => ( <ChatMessage key={message.id} message={message} activities={view.activities} streaming={busy && message.id === view.messages.at(-1)?.id} /> ))} </ShikiProvider> {busy ? ( <p className="inline-loading muted"> <Loader /> {view.stopping ? "Waiting for cancellation to finish…" : "Working…"} </p> ) : null} {view.messages.some((message) => message.parts.some((part) => "toolCallId" in part), ) && view.activityCursor !== null ? ( <Button size="sm" variant="secondary" disabled={view.activitiesLoading || !ready} onClick={() => { void session.loadActivities(); }} > {view.activitiesLoading ? "Loading activity…" : "Load earlier tool activity"} </Button> ) : null} {view.messages.length > 0 && !busy && !terminal ? ( <div className="chat-retry"> <Button size="sm" variant="secondary" disabled={!ready || !modelReady} onClick={() => { jump(); void session.retry(); }} > Retry last response </Button> </div> ) : null} </div> </div> {!pinned ? ( <div className="chat-jump"> <Button size="sm" variant="secondary" onClick={jump}> Jump to latest </Button> </div> ) : null} {view.unsentText ? ( <div className="chat-notice" role="alert"> <p>The message was not saved. Your text is retained.</p> <details> <summary>Unsent message</summary> <pre>{view.unsentText}</pre> </details> <Button size="sm" variant="secondary" disabled={!!draft} onClick={() => setDraft(view.unsentText!)} > Restore unsent message </Button> </div> ) : null} {!terminal ? ( <form className="chat-composer" onSubmit={(event) => { event.preventDefault(); if (!draft.trim() || !ready || busy || !modelReady) return; const text = draft; setDraft(""); jump(); void session.send(text); }} > <div className="chat-composer-surface"> <InputArea aria-label="Message" placeholder="Message Flarebot…" value={draft} onValueChange={setDraft} rows={3} maxLength={32_000} disabled={terminal} onKeyDown={(event) => { if ( event.key === "Enter" && !event.shiftKey && !event.isComposing ) { event.preventDefault(); event.currentTarget.form?.requestSubmit(); } }} /> <div className="chat-composer-actions"> <div className="chat-model-controls"> <ChatModelPicker value={view.modelSelection ?? null} disabled={!ready || busy || !view.modelSettings} providerReady={providerReady} onChange={session.selectModel} /> {configuration && ( <ModelEffortSelect compact configuration={configuration} disabled={!ready || busy || !modelReady} onChange={session.selectModel} /> )} </div> {busy ? ( <Button variant="secondary" size="sm" aria-label={view.stopping ? "Stopping…" : "Stop response"} disabled={view.stopping || view.connection !== "connected"} onClick={() => { void session.stop(); }} > {view.stopping ? "Stopping…" : "Stop"} </Button> ) : ( <Button type="submit" variant="primary" aria-label="Send message" disabled={!ready || !draft.trim() || !modelReady} > Send </Button> )} </div> </div> {view.modelSettings && !modelReady ? ( <p className="chat-model-hint muted"> Set up the selected provider before sending.{" "} <a href="/settings">Provider settings</a> </p> ) : null} </form> ) : null} </main> );}export function Conversation() { const { id } = useParams({ from: "/conversations/$id" }); const { conversations, status } = useShellSession(); return ( <ConversationContent key={id} id={id} name={ conversations.find((item) => item.id === id)?.name ?? "Conversation" } shell={status} /> );}