KI-Chat Component für React

'use client';

import { Fragment, useCallback, useEffect, useId, useLayoutEffect, useRef, useState } from 'react';
import { cn, prefersReducedMotion, round, useSpotlight, useTexts } from '@/lib/kit';
import { Button } from '@/components/ui/button';
import { Icon, type IconName } from '@/components/ui/icon';

export type AiChatVariant = 'chat-window' | 'prompt-composer' | 'agent-steps' | 'history-sidebar' | 'answer-with-sources' | 'voice-widget';

export interface ChatMessage {
  id: string;
  role: 'user' | 'assistant';
  /** Plain text. Blank lines make paragraphs, lines starting with "- " make a list, **bold** works. */
  content: string;
  time?: string;
}

export interface AgentStep {
  title: string;
  detail?: string;
  /** The tool the agent used, e.g. "Read spreadsheet" */
  tool?: string;
  status: 'done' | 'running' | 'pending' | 'approval' | 'error';
  duration?: string;
  /** Lines shown when the step is opened */
  output?: string[];
}

export interface Source {
  id: number;
  title: string;
  site: string;
  snippet: string;
  href: string;
}

export interface AiChatProps {
  variant?: AiChatVariant;
  assistant: { name: string; model?: string; avatar?: React.ReactNode };
  user?: { name: string };
  /** Conversation so far */
  messages?: ChatMessage[];
  /** Prompts to start with */
  suggestions?: { label: string; prompt?: string; icon?: IconName }[];
  placeholder?: string;
  title?: React.ReactNode;
  description?: React.ReactNode;
  /** Models to pick from in the composer */
  models?: string[];
  /**
   * Produces the reply for a prompt. Without it the block answers with a short
   * built-in text, so the demo streams like the real thing.
   */
  respond?: (prompt: string) => string | Promise<string>;
  /** agent-steps */
  task?: { title: string; started: string; files?: string[] };
  steps?: AgentStep[];
  /** history-sidebar */
  history?: { id: string; title: string; group: string; active?: boolean }[];
  /** answer-with-sources */
  question?: string;
  answer?: { text: string; cites?: number[] }[];
  sources?: Source[];
  related?: string[];
  /** voice-widget: open on load */
  defaultOpen?: boolean;
  labels?: Partial<(typeof TEXTS)['en']>;
  className?: string;
}

const TEXTS = {
  en: {
    message: 'Message',
    messageTo: 'Message {name}',
    send: 'Send',
    stop: 'Stop',
    attach: 'Attach files',
    remove: 'Remove {name}',
    model: 'Model',
    online: 'Online',
    thinking: 'Thinking',
    copy: 'Copy',
    copied: 'Copied',
    good: 'Good answer',
    bad: 'Bad answer',
    retry: 'Try again',
    enterHint: 'Enter to send, Shift Enter for a new line',
    disclaimer: 'Answers can be wrong. Check what matters.',
    webSearch: 'Search the web',
    fallback: 'Here is a first draft to work with:\n\n- I summarised the key points in three short paragraphs\n- I kept your tone and the numbers you gave me\n- Tell me what to cut or expand\n\nWant me to turn this into an email as well?',
    you: 'You',
    newChat: 'New chat',
    searchChats: 'Search chats',
    history: 'Chats',
    openHistory: 'Show chats',
    closeHistory: 'Close chats',
    noChats: 'No chat matches.',
    progress: '{done} of {total} steps',
    running: 'Working',
    done: 'Done',
    pending: 'Waiting',
    approval: 'Needs your approval',
    failed: 'Failed',
    approve: 'Approve and continue',
    decline: 'Skip this step',
    showDetails: 'Show details',
    hideDetails: 'Hide details',
    stopAgent: 'Stop agent',
    stopped: 'Stopped. Nothing after this step was changed.',
    finished: 'Finished. Everything is ready for review.',
    files: 'Files',
    sources: 'Sources',
    answer: 'Answer',
    related: 'Related',
    followUp: 'Ask a follow-up',
    source: 'Source {n}',
    openAssistant: 'Open assistant',
    closeAssistant: 'Close assistant',
    listen: 'Start speaking',
    stopListening: 'Stop listening',
    listening: 'Listening…',
    tapToTalk: 'Tap the microphone and talk, or type below.',
    typeInstead: 'Type a message',
    heard: 'Do you have a table for four on Friday evening?',
    voiceReply: 'Yes, Friday at 7:30 pm is free for four people. Shall I book it under your name?',
    nudge: 'Questions? Ask by voice or text.',
    dismiss: 'Dismiss',
  },
  de: {
    message: 'Nachricht',
    messageTo: 'Nachricht an {name}',
    send: 'Senden',
    stop: 'Stoppen',
    attach: 'Dateien anhängen',
    remove: '{name} entfernen',
    model: 'Modell',
    online: 'Online',
    thinking: 'Denkt nach',
    copy: 'Kopieren',
    copied: 'Kopiert',
    good: 'Gute Antwort',
    bad: 'Schlechte Antwort',
    retry: 'Neu versuchen',
    enterHint: 'Enter sendet, Umschalt Enter macht eine neue Zeile',
    disclaimer: 'Antworten können falsch sein. Prüfe, was wichtig ist.',
    webSearch: 'Im Web suchen',
    fallback: 'Hier ist ein erster Entwurf zum Weiterarbeiten:\n\n- Die wichtigsten Punkte stehen in drei kurzen Absätzen\n- Dein Ton und deine Zahlen sind geblieben\n- Sag mir, was raus soll oder mehr Platz braucht\n\nSoll ich daraus auch eine E-Mail machen?',
    you: 'Du',
    newChat: 'Neuer Chat',
    searchChats: 'Chats durchsuchen',
    history: 'Chats',
    openHistory: 'Chats zeigen',
    closeHistory: 'Chats schließen',
    noChats: 'Kein Chat passt.',
    progress: '{done} von {total} Schritten',
    running: 'Arbeitet',
    done: 'Fertig',
    pending: 'Wartet',
    approval: 'Braucht deine Freigabe',
    failed: 'Fehlgeschlagen',
    approve: 'Freigeben und weiter',
    decline: 'Schritt überspringen',
    showDetails: 'Details zeigen',
    hideDetails: 'Details verbergen',
    stopAgent: 'Agent stoppen',
    stopped: 'Gestoppt. Nach diesem Schritt wurde nichts verändert.',
    finished: 'Fertig. Alles liegt zur Durchsicht bereit.',
    files: 'Dateien',
    sources: 'Quellen',
    answer: 'Antwort',
    related: 'Weiterführend',
    followUp: 'Nachfrage stellen',
    source: 'Quelle {n}',
    openAssistant: 'Assistent öffnen',
    closeAssistant: 'Assistent schließen',
    listen: 'Sprechen',
    stopListening: 'Zuhören beenden',
    listening: 'Hört zu…',
    tapToTalk: 'Tippe aufs Mikrofon und sprich, oder schreib unten.',
    typeInstead: 'Nachricht schreiben',
    heard: 'Habt ihr am Freitagabend einen Tisch für vier?',
    voiceReply: 'Ja, Freitag um 19:30 Uhr ist für vier Personen frei. Soll ich auf deinen Namen reservieren?',
    nudge: 'Fragen? Frag per Stimme oder Text.',
    dismiss: 'Ausblenden',
  },
};

type Texts = (typeof TEXTS)['en'];
type P = AiChatProps & { t: Texts };
const fill = (s: string, v: Record<string, string | number>) => s.replace(/\{(\w+)\}/g, (_, k) => String(v[k] ?? ''));

/* ------------------------------------------------------------------ */
/* Motion of the app screens                                           */
/* ------------------------------------------------------------------ */
/*
 * The same small set in every app block (auth, dashboard, files, inbox …),
 * kept in the block so it ships on its own:
 *   useEnter   entrance that waits until its area scrolls in. The area gets
 *              data-kitm-scope and data-kitm={state}, children take kitm-wipe
 *              (charts draw from the left), kitm-grow-x, kitm-grow-y (bars),
 *              kitm-up and kitm-pop, with --kitm-d as delay.
 *   useGlide   a marker inside the active item ([data-glide]) glides over
 *              from where the previous one stood: tabs, segments, steps.
 *   useFlip    rows with data-flip="<id>" glide to their new place when a
 *              list is sorted or filtered, new rows fade in.
 *   kitm-in, kitm-fly, kitm-tick for things that appear after an action.
 * The server renders the end state, without JavaScript nothing waits longer
 * than 2.5 s, with reduced motion nothing moves. Only transform, opacity and
 * clip-path change, so no layout shifts.
 */
const useIso = typeof window === 'undefined' ? useEffect : useLayoutEffect;
const KITM_EASE = 'cubic-bezier(0.2, 0.7, 0.2, 1)';
const KITM_FX: [string, string, number][] = [
  ['wipe', 'clip-path:inset(0 100% 0 0)', 1100],
  ['grow-x', 'transform:scaleX(0)', 900],
  ['grow-y', 'transform:scaleY(0)', 800],
  ['up', 'opacity:0;transform:translateY(10px)', 600],
  ['pop', 'opacity:0;transform:scale(.92)', 450],
];
const KITM_CSS =
  KITM_FX.map(([k, v]) => `@keyframes kitm-${k}{from{${v}}}@keyframes kitm-${k}-h{from{${v}}}`).join('') +
  '@keyframes kitm-fly{from{opacity:0;transform:translateX(24px)}}@keyframes kitm-sheen{to{transform:translateX(130%)}}.kitm-sheen{transform:translateX(-130%)}@keyframes kitm-blink{50%{opacity:0}}@keyframes kitm-shake{20%,60%{transform:translateX(-5px)}40%,80%{transform:translateX(5px)}}@keyframes kitm-ring{20%{transform:rotate(14deg)}40%{transform:rotate(-11deg)}60%{transform:rotate(7deg)}80%{transform:rotate(-3deg)}}@keyframes kitm-next{from{opacity:0;transform:translateX(18px)}}@keyframes kitm-prev{from{opacity:0;transform:translateX(-18px)}}.kitm-caret{display:inline-block;width:.45em;height:1.1em;margin-left:.15em;vertical-align:-.2em;border-radius:2px;background:color-mix(in oklab,var(--primary) 80%,var(--foreground))}@keyframes kitm-flash{from{background-color:color-mix(in oklab,var(--primary) 14%,transparent)}}' +
  '.kitm-grow-x{transform-origin:left}.kitm-grow-y{transform-origin:bottom}' +
  '@media (prefers-reduced-motion:no-preference){' +
  KITM_FX.map(([k, , d]) => `[data-kitm=play] .kitm-${k}{animation:kitm-${k} var(--kitm-t,${d}ms) var(--ease-kit) var(--kitm-d,0ms) both}[data-kitm=wait] .kitm-${k}{animation:kitm-${k}-h 0s 1s both paused}`).join('') +
  '[data-kitm=play] .kitm-sheen{animation:kitm-sheen 1.6s var(--ease-kit) var(--kitm-d,400ms) both}.kitm-in{animation:kitm-up var(--kitm-t,.5s) var(--ease-kit) var(--kitm-d,0ms) both}.kitm-fly{animation:kitm-fly .55s var(--ease-kit) var(--kitm-d,0ms) both}.kitm-tick{animation:kitm-wipe .36s var(--ease-kit) both}.kitm-caret{animation:kitm-blink 1.05s steps(1) infinite}.kitm-shake{animation:kitm-shake .4s ease-in-out}.kitm-ring{transform-origin:50% 8%;animation:kitm-ring .9s var(--ease-kit) both}.kitm-next{animation:kitm-next .45s var(--ease-kit) both}.kitm-prev{animation:kitm-prev .45s var(--ease-kit) both}.kitm-flash{animation:kitm-flash 1.6s ease-out both}' +
  '}@media (scripting:enabled) and (prefers-reduced-motion:no-preference){' +
  KITM_FX.map(([k]) => `[data-kitm-scope]:not([data-kitm]) .kitm-${k}{animation:kitm-${k}-h 0s 2.5s both}`).join('') +
  '}';

function KitmStyle() {
  // React hoists it once into the head, however many app blocks render
  return (
    <style href="kitm" precedence="default">
      {KITM_CSS}
    </style>
  );
}

/** Entrance state of an area: undefined on the server, then wait (below the fold) or play */
function useEnter<T extends HTMLElement>() {
  const ref = useRef<T>(null);
  const [state, setState] = useState<'wait' | 'play' | undefined>(undefined);
  useEffect(() => {
    const el = ref.current;
    if (!el || prefersReducedMotion() || el.getBoundingClientRect().top < window.innerHeight * 0.92) return setState('play');
    setState('wait');
    const io = new IntersectionObserver(
      ([e]) => {
        if (!e?.isIntersecting) return;
        setState('play');
        io.disconnect();
      },
      { rootMargin: '0px 0px -8% 0px' },
    );
    io.observe(el);
    return () => io.disconnect();
  }, []);
  return [ref, { 'data-kitm-scope': '', 'data-kitm': state }] as const;
}

type Box = { x: number; y: number; w: number; h: number };
const boxOf = (el: Element, root: HTMLElement): Box => {
  const r = el.getBoundingClientRect();
  const b = root.getBoundingClientRect();
  return { x: r.left - b.left + root.scrollLeft, y: r.top - b.top + root.scrollTop, w: r.width, h: r.height };
};

/**
 * The marker ([data-glide]) is rendered inside the active item, so the server
 * and a page without JavaScript show it in place. After a change it starts
 * where the old one stood and glides into the new item.
 */
function useGlide<T extends HTMLElement>(key: unknown) {
  const ref = useRef<T>(null);
  const before = useRef<Box | null>(null);
  // Read during render, while the DOM still shows the old marker
  if (typeof window !== 'undefined' && ref.current) {
    const m = ref.current.querySelector('[data-glide]');
    before.current = m ? boxOf(m, ref.current) : null;
  }
  useIso(() => {
    const root = ref.current;
    const m = root?.querySelector<HTMLElement>('[data-glide]');
    const a = before.current;
    if (!root || !m || !a || prefersReducedMotion()) return;
    const b = boxOf(m, root);
    if (!b.w || !b.h || (Math.abs(a.x - b.x) < 1 && Math.abs(a.y - b.y) < 1 && Math.abs(a.w - b.w) < 1)) return;
    m.animate([{ transformOrigin: '0 0', transform: `translate(${a.x - b.x}px, ${a.y - b.y}px) scale(${a.w / b.w}, ${a.h / b.h})` }, { transformOrigin: '0 0', transform: 'none' }], { duration: 420, easing: KITM_EASE });
  }, [key]);
  return ref;
}

/** Rows marked data-flip="<id>" glide to their new place, new rows rise in */
function useFlip<T extends HTMLElement>(key: unknown) {
  const ref = useRef<T>(null);
  const before = useRef<Map<string, Box> | null>(null);
  if (typeof window !== 'undefined' && ref.current) {
    const root = ref.current;
    before.current = new Map(Array.from(root.querySelectorAll<HTMLElement>('[data-flip]'), (el) => [el.dataset.flip!, boxOf(el, root)]));
  }
  useIso(() => {
    const root = ref.current;
    const old = before.current;
    if (!root || !old || prefersReducedMotion()) return;
    root.querySelectorAll<HTMLElement>('[data-flip]').forEach((el, i) => {
      const a = old.get(el.dataset.flip!);
      // Stop an earlier glide, but leave the CSS entrances (kitm-up, kitm-fly) alone
      const anims = el.getAnimations();
      anims.forEach((x) => !('animationName' in x) && x.cancel());
      const b = boxOf(el, root);
      if (!a) {
        if (old.size && !anims.some((x) => 'animationName' in x && x.playState === 'running')) el.animate([{ opacity: 0, transform: 'translateY(8px)' }, { opacity: 1, transform: 'none' }], { duration: 380, delay: Math.min(i, 8) * 30, easing: KITM_EASE, fill: 'backwards' });
        return;
      }
      if (Math.abs(a.x - b.x) < 1 && Math.abs(a.y - b.y) < 1) return;
      el.animate([{ transform: `translate(${a.x - b.x}px, ${a.y - b.y}px)` }, { transform: 'none' }], { duration: 460, easing: KITM_EASE });
    });
  }, [key]);
  return ref;
}


/* ------------------------------------------------------------------ */
/* Text                                                                */
/* ------------------------------------------------------------------ */

function inline(text: string) {
  return text.split(/(\*\*[^*]+\*\*)/g).map((part, i) => (part.startsWith('**') ? <strong key={i} className="font-semibold text-foreground">{part.slice(2, -2)}</strong> : <Fragment key={i}>{part}</Fragment>));
}

/** Paragraphs, simple lists and bold, enough for chat answers. `caret` ends the last line with a cursor while it streams. */
function RichText({ text, className, caret }: { text: string; className?: string; caret?: boolean }) {
  const blocks = text.split(/\n{2,}/);
  const cursor = caret ? <span className="kitm-caret" aria-hidden /> : null;
  return (
    <div className={cn('space-y-3 text-pretty text-[14.5px] leading-relaxed', className)}>
      {!text && cursor}
      {blocks.map((b, i) => {
        const lines = b.split('\n');
        const last = i === blocks.length - 1;
        if (lines.every((l) => l.startsWith('- '))) {
          return (
            <ul key={i} className="space-y-1.5">
              {lines.map((l, j) => (
                <li key={l} className="relative pl-4 before:absolute before:left-0.5 before:top-[0.65em] before:size-1.5 before:rounded-full before:bg-primary">
                  {inline(l.slice(2))}
                  {last && j === lines.length - 1 && cursor}
                </li>
              ))}
            </ul>
          );
        }
        return (
          <p key={i}>
            {inline(b)}
            {last && cursor}
          </p>
        );
      })}
    </div>
  );
}

/* ------------------------------------------------------------------ */
/* Conversation engine                                                 */
/* ------------------------------------------------------------------ */

function useConversation(initial: ChatMessage[], respond: AiChatProps['respond'], fallback: string) {
  const [messages, setMessages] = useState(initial);
  const [state, setState] = useState<'idle' | 'thinking' | 'streaming'>('idle');
  const stopRef = useRef(false);
  const timer = useRef<ReturnType<typeof setInterval> | undefined>(undefined);

  useEffect(() => () => clearInterval(timer.current), []);

  const send = useCallback(
    async (prompt: string) => {
      const text = prompt.trim();
      if (!text) return;
      stopRef.current = false;
      const uid = `u${Date.now()}`;
      setMessages((m) => [...m, { id: uid, role: 'user', content: text }]);
      setState('thinking');
      const reply = respond ? await respond(text) : (await new Promise((r) => setTimeout(r, 900)), fallback);
      if (stopRef.current) return setState('idle');
      const aid = `a${Date.now()}`;
      if (prefersReducedMotion()) {
        setMessages((m) => [...m, { id: aid, role: 'assistant', content: reply }]);
        return setState('idle');
      }
      setState('streaming');
      setMessages((m) => [...m, { id: aid, role: 'assistant', content: '' }]);
      let i = 0;
      timer.current = setInterval(() => {
        i = Math.min(reply.length, i + 3);
        setMessages((m) => m.map((x) => (x.id === aid ? { ...x, content: reply.slice(0, i) } : x)));
        if (i >= reply.length || stopRef.current) {
          clearInterval(timer.current);
          setState('idle');
        }
      }, 18);
    },
    [respond, fallback],
  );

  const stop = () => {
    stopRef.current = true;
    clearInterval(timer.current);
    setState('idle');
  };

  return { messages, state, send, stop, setMessages };
}

/* ------------------------------------------------------------------ */
/* Parts                                                               */
/* ------------------------------------------------------------------ */

function AssistantAvatar({ assistant, size = 'md' }: { assistant: AiChatProps['assistant']; size?: 'sm' | 'md' | 'lg' }) {
  const s = size === 'sm' ? 'size-7' : size === 'lg' ? 'size-12' : 'size-8';
  if (assistant.avatar) return <span className={cn('shrink-0 [&>*]:size-full', s)}>{assistant.avatar}</span>;
  return (
    <span className={cn('relative grid shrink-0 place-items-center overflow-hidden rounded-full bg-[conic-gradient(from_200deg,var(--primary),color-mix(in_oklab,var(--primary)_40%,var(--foreground)),var(--primary))] text-primary-foreground shadow-[inset_0_1px_0_rgb(255_255_255/0.25),var(--shadow-sm)]', s)} aria-hidden>
      <Icon name="sparkle" size={size === 'lg' ? 22 : 15} />
    </span>
  );
}

/** Online: a dot that breathes, so the assistant reads as present */
function LiveDot() {
  return (
    <span className="relative grid size-1.5 place-items-center" aria-hidden>
      <span className="absolute size-1.5 animate-ping rounded-full bg-success opacity-60 [animation-duration:2.4s] motion-reduce:hidden" />
      <span className="size-1.5 rounded-full bg-success" />
    </span>
  );
}

function Typing({ label }: { label: string }) {
  return (
    <span className="kitm-in inline-flex items-center gap-2 text-[13px] text-muted-foreground [--kitm-t:.35s]" role="status">
      <span className="flex gap-1" aria-hidden>
        {[0, 1, 2].map((i) => (
          <span key={i} className="size-1.5 animate-kit-pulse rounded-full bg-current" style={{ animationDelay: `${i * 160}ms`, animationDuration: '1s' }} />
        ))}
      </span>
      {label}
    </span>
  );
}

function MessageActions({ text, t }: { text: string; t: Texts }) {
  const [copied, setCopied] = useState(false);
  const [vote, setVote] = useState<'up' | 'down' | null>(null);
  const btn = 'grid size-8 place-items-center rounded-md text-subtle-foreground transition-colors hover:bg-accent hover:text-foreground';
  return (
    <div className="mt-1.5 flex items-center gap-0.5 opacity-100 transition-opacity sm:opacity-0 sm:group-hover/msg:opacity-100 sm:group-focus-within/msg:opacity-100">
      <button
        type="button"
        className={btn}
        aria-label={copied ? t.copied : t.copy}
        onClick={async () => {
          try {
            await navigator.clipboard.writeText(text);
          } catch {
            /* clipboard blocked */
          }
          setCopied(true);
          setTimeout(() => setCopied(false), 1500);
        }}
      >
        {/* The check draws itself, then turns back into the copy icon */}
        <Icon key={String(copied)} name={copied ? 'check' : 'copy'} size={15} className={copied ? 'kitm-tick text-success' : 'kitm-in [--kitm-t:.25s]'} />
      </button>
      <button type="button" className={cn(btn, vote === 'up' && 'text-foreground')} aria-pressed={vote === 'up'} aria-label={t.good} onClick={() => setVote(vote === 'up' ? null : 'up')}>
        <Icon name="thumbs-up" size={15} className={cn('transition-transform duration-300 ease-[var(--ease-kit)]', vote === 'up' && '-translate-y-0.5 -rotate-12 scale-110')} />
      </button>
      <button type="button" className={cn(btn, vote === 'down' && 'text-foreground')} aria-pressed={vote === 'down'} aria-label={t.bad} onClick={() => setVote(vote === 'down' ? null : 'down')}>
        <Icon name="thumbs-down" size={15} className={cn('transition-transform duration-300 ease-[var(--ease-kit)]', vote === 'down' && 'translate-y-0.5 rotate-12 scale-110')} />
      </button>
    </div>
  );
}

function Messages({ messages, state, assistant, t, className }: { messages: ChatMessage[]; state: 'idle' | 'thinking' | 'streaming'; assistant: AiChatProps['assistant']; t: Texts; className?: string }) {
  const end = useRef<HTMLDivElement>(null);
  const first = useRef(true);
  // The conversation so far rises in once, every message after that slides in on its own
  const [scope, enter] = useEnter<HTMLDivElement>();
  const initial = useRef<Set<string> | null>(null);
  if (!initial.current) initial.current = new Set(messages.map((m) => m.id));
  const motion = (m: ChatMessage, i: number) => (initial.current!.has(m.id) ? { className: 'kitm-up', style: { '--kitm-d': `${Math.min(i, 6) * 90}ms` } as React.CSSProperties } : { className: m.role === 'user' ? 'kitm-fly' : 'kitm-in', style: undefined });
  useEffect(() => {
    // Inside a scrolling panel keep the newest message in view, without moving the page
    const box = end.current?.closest<HTMLElement>('.overflow-y-auto');
    if (box) {
      box.scrollTo({ top: box.scrollHeight, behavior: first.current || prefersReducedMotion() ? 'auto' : 'smooth' });
    } else if (!first.current) {
      end.current?.scrollIntoView({ block: 'nearest', behavior: prefersReducedMotion() ? 'auto' : 'smooth' });
    }
    first.current = false;
  }, [messages, state]);
  return (
    <div ref={scope} {...enter} className={cn('space-y-6', className)} role="log" aria-live="polite" aria-relevant="additions">
      {messages.map((m, i) =>
        m.role === 'user' ? (
          <div key={m.id} className={cn('flex justify-end', motion(m, i).className)} style={motion(m, i).style}>
            <div className="max-w-[85%] rounded-2xl rounded-br-md bg-primary px-4 py-2.5 text-[14.5px] leading-relaxed text-primary-foreground shadow-[var(--shadow-sm)] sm:max-w-[75%]">
              <span className="sr-only">{t.you}: </span>
              {m.content}
            </div>
          </div>
        ) : (
          <div key={m.id} className={cn('group/msg flex gap-3', motion(m, i).className)} style={motion(m, i).style}>
            <AssistantAvatar assistant={assistant} />
            <div className="min-w-0 flex-1 pt-1">
              <p className="mb-1 flex items-center gap-2 text-[12.5px] font-medium text-foreground">
                {assistant.name}
                {m.time && <span className="font-normal text-subtle-foreground">{m.time}</span>}
              </p>
              <RichText text={m.content} className="text-foreground/90" caret={state === 'streaming' && i === messages.length - 1} />
              {m.content && !(state === 'streaming' && i === messages.length - 1) && <MessageActions text={m.content} t={t} />}
            </div>
          </div>
        ),
      )}
      {state === 'thinking' && (
        <div className="kitm-in flex gap-3 [--kitm-t:.35s]">
          <span className="relative grid shrink-0 place-items-center">
            <span className="absolute inset-0 animate-ping rounded-full bg-[color-mix(in_oklab,var(--primary)_35%,transparent)] [animation-duration:1.6s] motion-reduce:hidden" aria-hidden />
            <AssistantAvatar assistant={assistant} />
          </span>
          <div className="pt-1.5">
            <Typing label={t.thinking} />
          </div>
        </div>
      )}
      <div ref={end} />
    </div>
  );
}

interface ComposerProps {
  t: Texts;
  onSend: (text: string) => void;
  onStop?: () => void;
  busy?: boolean;
  placeholder?: string;
  models?: string[];
  size?: 'md' | 'lg';
  tools?: boolean;
  autoFocus?: boolean;
  className?: string;
  value?: string;
  onValue?: (v: string) => void;
}

/** Auto growing input. Enter sends, Shift Enter adds a line. */
function Composer({ t, onSend, onStop, busy, placeholder, models, size = 'md', tools, autoFocus, className, value: controlled, onValue }: ComposerProps) {
  const [own, setOwn] = useState('');
  const value = controlled ?? own;
  const setValue = onValue ?? setOwn;
  const [files, setFiles] = useState<string[]>([]);
  const [model, setModel] = useState(models?.[0] ?? '');
  const [web, setWeb] = useState(false);
  const area = useRef<HTMLTextAreaElement>(null);
  const file = useRef<HTMLInputElement>(null);
  const id = useId();

  useEffect(() => {
    const el = area.current;
    if (!el) return;
    el.style.height = 'auto';
    el.style.height = `${Math.min(el.scrollHeight, size === 'lg' ? 240 : 180)}px`;
  }, [value, size]);

  const submit = () => {
    if (busy || !value.trim()) return;
    onSend(value);
    setValue('');
    setFiles([]);
  };

  return (
    <form
      onSubmit={(e) => {
        e.preventDefault();
        submit();
      }}
      className={cn(
        'rounded-2xl border border-border bg-card shadow-[var(--highlight),var(--shadow-md)] transition-[border-color,box-shadow] focus-within:border-border-strong focus-within:shadow-[var(--highlight),var(--shadow-md),0_0_0_4px_var(--glow)]',
        className,
      )}
    >
      {files.length > 0 && (
        <ul className="flex flex-wrap gap-1.5 px-3 pt-3">
          {files.map((f) => (
            <li key={f} className="kitm-in inline-flex h-8 items-center gap-1.5 rounded-lg border border-border bg-surface pl-2 pr-1 text-[12.5px] text-foreground [--kitm-t:.3s]">
              <Icon name="file" size={14} className="text-muted-foreground" />
              <span className="max-w-[10rem] truncate">{f}</span>
              <button type="button" onClick={() => setFiles(files.filter((x) => x !== f))} aria-label={fill(t.remove, { name: f })} className="grid size-6 place-items-center rounded text-muted-foreground hover:bg-accent hover:text-foreground">
                <Icon name="x" size={12} />
              </button>
            </li>
          ))}
        </ul>
      )}
      <label htmlFor={`${id}-m`} className="sr-only">
        {t.message}
      </label>
      <textarea
        ref={area}
        id={`${id}-m`}
        rows={1}
        value={value}
        autoFocus={autoFocus}
        placeholder={placeholder}
        aria-describedby={`${id}-h`}
        onChange={(e) => setValue(e.target.value)}
        onKeyDown={(e) => {
          if (e.key === 'Enter' && !e.shiftKey && !e.nativeEvent.isComposing) {
            e.preventDefault();
            submit();
          }
        }}
        className={cn('block w-full resize-none bg-transparent px-4 text-foreground outline-none placeholder:text-subtle-foreground', size === 'lg' ? 'min-h-[5.5rem] pt-4 text-[16px] leading-relaxed' : 'min-h-[3rem] pt-3.5 text-[15px] leading-relaxed')}
      />
      <p id={`${id}-h`} className="sr-only">
        {t.enterHint}
      </p>
      <div className="flex items-center gap-1 p-2 pt-1">
        <input
          ref={file}
          type="file"
          multiple
          className="sr-only"
          tabIndex={-1}
          aria-hidden
          onChange={(e) => {
            const names = Array.from(e.target.files ?? []).map((f) => f.name);
            setFiles((fs) => Array.from(new Set([...fs, ...names])));
            e.target.value = '';
          }}
        />
        <button type="button" onClick={() => file.current?.click()} aria-label={t.attach} className="grid size-11 place-items-center sm:size-10 rounded-lg text-muted-foreground transition-colors hover:bg-accent hover:text-foreground">
          <Icon name="paperclip" size={18} />
        </button>
        {tools && (
          <button type="button" aria-pressed={web} onClick={() => setWeb(!web)} className={cn('inline-flex h-11 items-center gap-1.5 rounded-lg border px-2.5 text-[13px] font-medium transition-colors sm:h-10', web ? 'border-transparent bg-[color-mix(in_oklab,var(--primary)_14%,transparent)] text-[color-mix(in_oklab,var(--primary)_80%,var(--foreground))]' : 'border-border text-muted-foreground hover:text-foreground')}>
            <Icon name="globe" size={15} />
            <span className="max-sm:sr-only">{t.webSearch}</span>
          </button>
        )}
        {models && models.length > 0 && (
          <span className="relative ml-1 inline-flex">
            <label htmlFor={`${id}-model`} className="sr-only">
              {t.model}
            </label>
            <select id={`${id}-model`} value={model} onChange={(e) => setModel(e.target.value)} className="h-11 cursor-pointer appearance-none rounded-lg bg-transparent pl-2.5 pr-7 sm:h-10 text-[13px] font-medium text-muted-foreground transition-colors hover:bg-accent hover:text-foreground">
              {models.map((m) => (
                <option key={m}>{m}</option>
              ))}
            </select>
            <Icon name="chevron-down" size={13} className="pointer-events-none absolute right-2 top-1/2 -translate-y-1/2 text-subtle-foreground" />
          </span>
        )}
        <span className="ml-auto" />
        {busy && onStop ? (
          <button type="button" onClick={onStop} aria-label={t.stop} className="grid size-11 place-items-center rounded-xl sm:size-10 bg-foreground text-background shadow-[var(--shadow-sm)] transition-transform active:scale-95">
            <Icon name="stop" size={15} className="fill-current" />
          </button>
        ) : (
          <button type="submit" disabled={!value.trim() || busy} aria-label={t.send} className="group/send grid size-11 place-items-center overflow-hidden rounded-xl bg-primary text-primary-foreground shadow-[inset_0_1px_0_rgb(255_255_255/0.18),var(--shadow-sm)] transition-[transform,opacity] duration-300 ease-[var(--ease-kit)] active:scale-95 disabled:scale-90 disabled:opacity-35 sm:size-10 motion-reduce:disabled:scale-100">
            {/* The arrow nudges up on hover, as if it already wants to go */}
            <Icon name="arrow-up" size={18} strokeWidth={2} className="transition-transform duration-300 ease-[var(--ease-kit)] group-enabled/send:group-hover/send:-translate-y-0.5" />
          </button>
        )}
      </div>
    </form>
  );
}

function Suggestions({ items, onPick, className }: { items: NonNullable<AiChatProps['suggestions']>; onPick: (p: string) => void; className?: string }) {
  const [scope, enter] = useEnter<HTMLUListElement>();
  return (
    <ul ref={scope} {...enter} className={cn('flex flex-wrap gap-2', className)}>
      {items.map((s, i) => (
        <li key={s.label} className="kitm-up" style={{ '--kitm-d': `${120 + i * 60}ms` } as React.CSSProperties}>
          <button type="button" onClick={() => onPick(s.prompt ?? s.label)} className="inline-flex min-h-10 items-center gap-2 rounded-full border border-border bg-background px-3.5 text-left text-[13px] text-muted-foreground shadow-[var(--shadow-sm)] transition-[border-color,color,transform] duration-200 hover:-translate-y-px hover:border-border-strong hover:text-foreground motion-reduce:hover:translate-y-0">
            {s.icon && <Icon name={s.icon} size={15} className="shrink-0" />}
            {s.label}
          </button>
        </li>
      ))}
    </ul>
  );
}

/* ------------------------------------------------------------------ */
/* chat-window                                                         */
/* ------------------------------------------------------------------ */

function ChatWindow({ t, assistant, messages = [], suggestions, placeholder, respond, models, className }: P) {
  const c = useConversation(messages, respond, t.fallback);
  return (
    <div className={cn('kit-glow flex min-h-dvh items-center justify-center bg-surface p-0 sm:p-6 lg:p-10', className)}>
      <section className="flex h-dvh w-full max-w-[52rem] flex-col overflow-hidden bg-background sm:h-[min(48rem,calc(100dvh-3rem))] sm:rounded-2xl sm:border sm:border-border sm:shadow-[var(--highlight),var(--shadow-lg)]">
        <header className="flex h-16 shrink-0 items-center gap-3 border-b border-border px-4 sm:px-5">
          <AssistantAvatar assistant={assistant} />
          <div className="min-w-0 flex-1">
            <h1 className="truncate text-[15px] font-semibold tracking-[-0.01em] text-foreground">{assistant.name}</h1>
            <p className="flex items-center gap-1.5 text-[12px] text-muted-foreground">
              <LiveDot />
              {t.online}
              {assistant.model && <span className="text-subtle-foreground">· {assistant.model}</span>}
            </p>
          </div>
          <button type="button" aria-label={t.newChat} onClick={() => c.setMessages([])} className="grid size-10 place-items-center rounded-lg text-muted-foreground hover:bg-accent hover:text-foreground">
            <Icon name="edit" size={18} />
          </button>
        </header>
        <div className="kit-scrollbar min-h-0 flex-1 overflow-y-auto px-4 py-6 [mask-image:linear-gradient(to_bottom,transparent,#000_1.5rem)] sm:px-6">
          {c.messages.length === 0 && suggestions ? (
            <div className="grid h-full place-items-center text-center">
              <div className="kitm-in">
                <AssistantAvatar assistant={assistant} size="lg" />
                <p className="mt-4 text-[17px] font-semibold text-foreground">{assistant.name}</p>
                <Suggestions items={suggestions} onPick={c.send} className="mt-5 justify-center" />
              </div>
            </div>
          ) : (
            <Messages messages={c.messages} state={c.state} assistant={assistant} t={t} />
          )}
        </div>
        <div className="relative shrink-0 px-3 pb-3 pt-2 before:pointer-events-none before:absolute before:inset-x-0 before:-top-8 before:h-8 before:bg-[linear-gradient(to_top,var(--background),transparent)] sm:px-5 sm:pb-5">
          {c.messages.length > 0 && suggestions && c.state === 'idle' && (
            <div className="kit-no-scrollbar max-sm:kit-fade-x -mx-3 mb-2.5 overflow-x-auto px-3 sm:mx-0 sm:px-0">
              <Suggestions items={suggestions.slice(0, 3)} onPick={c.send} className="flex-nowrap sm:flex-wrap [&_button]:whitespace-nowrap" />
            </div>
          )}
          <Composer t={t} onSend={c.send} onStop={c.stop} busy={c.state !== 'idle'} placeholder={placeholder ?? fill(t.messageTo, { name: assistant.name })} models={models} />
          <p className="mt-2 text-center text-[11.5px] text-subtle-foreground">{t.disclaimer}</p>
        </div>
      </section>
    </div>
  );
}

/* ------------------------------------------------------------------ */
/* prompt-composer                                                     */
/* ------------------------------------------------------------------ */

function PromptComposer({ t, assistant, title, description, suggestions = [], placeholder, models, respond, className }: P) {
  const c = useConversation([], respond, t.fallback);
  const [draft, setDraft] = useState('');
  const started = c.messages.length > 0;
  const spot = useSpotlight<HTMLButtonElement>();
  return (
    <div className={cn('kit-glow kit-dots min-h-dvh bg-background', className)}>
      <div className={cn('kit-container flex min-h-dvh flex-col py-10 sm:py-16', !started && 'justify-center')}>
        <div className="mx-auto w-full max-w-[46rem]">
          {!started && (
            <div className="kit-rise text-center">
              <span className="inline-flex">
                <AssistantAvatar assistant={assistant} size="lg" />
              </span>
              {title && <h1 className="mt-6 text-balance text-h2 font-semibold text-foreground">{title}</h1>}
              {description && <p className="mx-auto mt-3 max-w-[32rem] text-balance text-lead text-muted-foreground">{description}</p>}
            </div>
          )}
          {started && <Messages messages={c.messages} state={c.state} assistant={assistant} t={t} className="mb-8" />}
          <div className={cn('kit-rise [--kit-delay:120ms]', !started && 'mt-9', started && 'sticky bottom-4')}>
            <Composer t={t} onSend={c.send} onStop={c.stop} busy={c.state !== 'idle'} placeholder={placeholder} models={models} tools size={started ? 'md' : 'lg'} value={draft} onValue={setDraft} />
          </div>
          {!started && (
            <ul className="mt-5 grid gap-2.5 sm:grid-cols-2">
              {suggestions.map((s, i) => (
                <li key={s.label} className="kit-rise" style={{ '--kit-delay': `${240 + i * 70}ms` } as React.CSSProperties}>
                  <button
                    type="button"
                    onClick={() => setDraft(s.prompt ?? s.label)}
                    onPointerMove={spot}
                    className="kit-spotlight group flex h-full w-full items-start gap-3 rounded-xl border border-border bg-card p-3.5 text-left shadow-[var(--highlight),var(--shadow-sm)] transition-[border-color,transform,box-shadow] duration-300 ease-[var(--ease-kit)] hover:-translate-y-0.5 hover:border-border-strong hover:shadow-[var(--highlight),var(--shadow-md)] motion-reduce:hover:translate-y-0"
                  >
                    <span className="grid size-8 shrink-0 place-items-center rounded-lg bg-muted text-muted-foreground transition-colors group-hover:text-primary">
                      <Icon name={s.icon ?? 'sparkle'} size={16} />
                    </span>
                    <span className="min-w-0">
                      <span className="block text-[13.5px] font-medium text-foreground">{s.label}</span>
                      {s.prompt && <span className="mt-0.5 line-clamp-2 block text-[12.5px] text-muted-foreground">{s.prompt}</span>}
                    </span>
                  </button>
                </li>
              ))}
            </ul>
          )}
        </div>
      </div>
    </div>
  );
}

/* ------------------------------------------------------------------ */
/* agent-steps                                                         */
/* ------------------------------------------------------------------ */

const STEP_STYLE: Record<AgentStep['status'], string> = {
  done: 'border-transparent bg-[color-mix(in_oklab,var(--success)_14%,transparent)] text-success',
  running: 'border-primary bg-background text-primary',
  pending: 'border-border bg-background text-subtle-foreground',
  approval: 'border-transparent bg-[color-mix(in_oklab,var(--warning)_18%,transparent)] text-[color-mix(in_oklab,var(--warning)_62%,var(--foreground))]',
  error: 'border-transparent bg-[color-mix(in_oklab,var(--destructive)_12%,transparent)] text-destructive',
};

function AgentSteps({ t, assistant, task, steps: initial = [], className }: P) {
  const [steps, setSteps] = useState(initial);
  const [open, setOpen] = useState<number | null>(initial.findIndex((s) => s.status === 'running'));
  const [stopped, setStopped] = useState(false);
  const id = useId();
  const done = steps.filter((s) => s.status === 'done').length;
  const runningIndex = steps.findIndex((s) => s.status === 'running');
  const approvalIndex = steps.findIndex((s) => s.status === 'approval');
  const finished = done === steps.length;

  // The running step finishes after a moment, the next one starts, until an approval is needed
  useEffect(() => {
    if (stopped || runningIndex < 0 || prefersReducedMotion()) return;
    const timer = setTimeout(() => {
      setSteps((all) =>
        all.map((s, i) => {
          if (i === runningIndex) return { ...s, status: 'done' };
          if (i === runningIndex + 1 && s.status === 'pending') return { ...s, status: 'running' };
          return s;
        }),
      );
      setOpen(runningIndex + 1);
    }, 2200);
    return () => clearTimeout(timer);
  }, [runningIndex, stopped]);

  const decide = (approve: boolean) =>
    setSteps((all) => all.map((s, i) => (i === approvalIndex ? { ...s, status: approve ? 'done' : 'error' } : i === approvalIndex + 1 && s.status === 'pending' ? { ...s, status: 'running' } : s)));

  const label = (s: AgentStep['status']) => ({ done: t.done, running: t.running, pending: t.pending, approval: t.approval, error: t.failed })[s];
  const [stepScope, stepEnter] = useEnter<HTMLOListElement>();

  return (
    <div className={cn('min-h-dvh bg-surface py-8 sm:py-14', className)}>
      <div className="mx-auto w-full max-w-[44rem] px-4 sm:px-6">
        <section className="overflow-hidden rounded-2xl border border-border bg-card shadow-[var(--highlight),var(--shadow-lg)]">
          <header className="relative border-b border-border p-5 sm:p-6">
            <div className="flex items-start gap-3">
              <AssistantAvatar assistant={assistant} />
              <div className="min-w-0 flex-1">
                <p className="text-[12.5px] text-muted-foreground">
                  {assistant.name} · {task?.started}
                </p>
                <h1 className="mt-0.5 text-balance text-[18px] font-semibold tracking-[-0.02em] text-foreground">{task?.title}</h1>
              </div>
              {!finished && !stopped && (
                <Button size="sm" variant="outline" iconLeft="stop" onClick={() => setStopped(true)} className="max-sm:hidden">
                  {t.stopAgent}
                </Button>
              )}
            </div>
            <div className="mt-5 flex items-center gap-3">
              <div className="h-1.5 flex-1 overflow-hidden rounded-full bg-track" role="progressbar" aria-valuemin={0} aria-valuemax={steps.length} aria-valuenow={done} aria-label={fill(t.progress, { done, total: steps.length })}>
                {/* scaleX instead of width, with a light running over the part that is done while the agent works */}
                <div className="relative h-full origin-left overflow-hidden rounded-full bg-primary transition-transform duration-700 ease-[var(--ease-kit)]" style={{ transform: `scaleX(${round(done / Math.max(1, steps.length), 4)})` }}>
                  {!finished && !stopped && <span className="kit-shine absolute inset-0 animate-[kit-shine_1.8s_linear_infinite] motion-reduce:hidden" aria-hidden />}
                </div>
              </div>
              <span className="text-[12.5px] tabular-nums text-muted-foreground" aria-live="polite">
                <span key={done} className="kitm-in inline-block [--kitm-t:.3s]">{done}</span>
                {fill(t.progress, { done: '', total: steps.length })}
              </span>
            </div>
          </header>
          <ol ref={stepScope} {...stepEnter} className="p-3 sm:p-4">
            {steps.map((s, i) => {
              const isOpen = open === i;
              const hasDetails = !!(s.detail || s.output?.length);
              return (
                <li key={s.title} className="kitm-up relative" style={{ '--kitm-d': `${i * 70}ms` } as React.CSSProperties}>
                  {i < steps.length - 1 && (
                    <span className="absolute bottom-0 left-[1.6rem] top-11 w-px overflow-hidden bg-border" aria-hidden>
                      {/* The line to the next step fills from the top once this one is done */}
                      <span className={cn('block size-full origin-top bg-[color-mix(in_oklab,var(--success)_55%,var(--border))] transition-transform duration-700 ease-[var(--ease-kit)]', s.status === 'done' ? 'scale-y-100' : 'scale-y-0')} />
                    </span>
                  )}
                  <div className={cn('flex items-start gap-3 rounded-xl p-2 transition-colors duration-300', s.status === 'running' && 'bg-surface')}>
                    <span className={cn('relative mt-0.5 grid size-8 shrink-0 place-items-center rounded-full border transition-colors duration-300', STEP_STYLE[s.status])}>
                      {s.status === 'running' && <span className="absolute -inset-1 animate-ping rounded-full border border-primary opacity-40 [animation-duration:1.8s] motion-reduce:hidden" aria-hidden />}
                      {s.status === 'done' && <Icon name="check" size={15} strokeWidth={2.2} className="kitm-tick" />}
                      {s.status === 'running' && <Icon name="loader" size={15} className="animate-kit-spin [--kit-duration:0.9s]" />}
                      {s.status === 'pending' && <span className="text-[12px] font-semibold tabular-nums">{i + 1}</span>}
                      {s.status === 'approval' && <Icon name="flag" size={14} />}
                      {s.status === 'error' && <Icon name="x" size={14} />}
                    </span>
                    <div className="min-w-0 flex-1">
                      <div className="flex min-h-9 flex-wrap items-center gap-x-2 gap-y-0.5">
                        <h2 className={cn('text-[14px] font-medium', s.status === 'pending' ? 'text-muted-foreground' : 'text-foreground')}>{s.title}</h2>
                        {s.tool && (
                          <span className="inline-flex items-center gap-1 rounded-md bg-muted px-1.5 py-0.5 text-[11.5px] text-muted-foreground">
                            <Icon name="terminal" size={11} />
                            {s.tool}
                          </span>
                        )}
                        <span className="sr-only">{label(s.status)}</span>
                        {s.duration && s.status === 'done' && <span className="ml-auto text-[12px] tabular-nums text-subtle-foreground">{s.duration}</span>}
                        {hasDetails && (
                          <button type="button" aria-expanded={isOpen} aria-controls={`${id}-${i}`} onClick={() => setOpen(isOpen ? null : i)} aria-label={isOpen ? t.hideDetails : t.showDetails} className={cn('grid size-8 place-items-center rounded-md text-muted-foreground hover:bg-accent hover:text-foreground', !(s.duration && s.status === 'done') && 'ml-auto')}>
                            <Icon name="chevron-down" size={15} className={cn('transition-transform duration-200', isOpen && 'rotate-180')} />
                          </button>
                        )}
                      </div>
                      {s.status === 'running' && <Typing label={t.running} />}
                      {hasDetails && (
                        <div id={`${id}-${i}`} className={cn('grid transition-[grid-template-rows] duration-300 ease-[var(--ease-kit)] motion-reduce:transition-none', isOpen ? 'grid-rows-[1fr]' : 'grid-rows-[0fr]')}>
                        <div className={cn('min-h-0 overflow-hidden transition-opacity duration-300', isOpen ? 'opacity-100' : 'opacity-0')} inert={!isOpen}>
                        <div className="pt-2">
                          {s.detail && <p className="text-pretty text-[13px] leading-relaxed text-muted-foreground">{s.detail}</p>}
                          {s.output && (
                            <div className="mt-2 rounded-lg border border-border bg-surface p-3 text-[12.5px] leading-relaxed text-foreground">
                              {s.output.map((line) => (
                                <p key={line} className="flex gap-2">
                                  <span className="select-none text-subtle-foreground" aria-hidden>
                                    ›
                                  </span>
                                  <span className="min-w-0 break-words">{line}</span>
                                </p>
                              ))}
                            </div>
                          )}
                        </div>
                        </div>
                        </div>
                      )}
                      {s.status === 'approval' && !stopped && (
                        <div className="kitm-in mt-3 flex flex-col gap-2 sm:flex-row">
                          <Button size="sm" iconLeft="check" onClick={() => decide(true)}>
                            {t.approve}
                          </Button>
                          <Button size="sm" variant="outline" onClick={() => decide(false)}>
                            {t.decline}
                          </Button>
                        </div>
                      )}
                    </div>
                  </div>
                  {i < steps.length - 1 && <div className="h-2" aria-hidden />}
                </li>
              );
            })}
          </ol>
          {(stopped || finished || task?.files?.length) && (
            <footer className="border-t border-border bg-surface p-4 sm:px-6">
              {(stopped || finished) && (
                <p className={cn('kitm-in mb-3 flex items-center gap-2 text-[13.5px]', stopped ? 'text-muted-foreground' : 'text-success')} role="status">
                  <Icon name={stopped ? 'stop' : 'check-circle'} size={16} className={stopped ? '' : 'kitm-tick'} />
                  {stopped ? t.stopped : t.finished}
                </p>
              )}
              {task?.files && (
                <>
                  <p className="text-[12px] font-medium text-subtle-foreground">{t.files}</p>
                  <ul className="mt-2 flex flex-wrap gap-2">
                    {task.files.map((f) => (
                      <li key={f}>
                        <a href="#" className="inline-flex h-9 items-center gap-2 rounded-lg border border-border bg-card px-3 text-[13px] text-foreground shadow-[var(--shadow-sm)] hover:border-border-strong">
                          <Icon name="file" size={15} className="text-muted-foreground" />
                          {f}
                        </a>
                      </li>
                    ))}
                  </ul>
                </>
              )}
              {!finished && !stopped && (
                <Button size="sm" variant="outline" iconLeft="stop" onClick={() => setStopped(true)} className="mt-4 w-full sm:hidden">
                  {t.stopAgent}
                </Button>
              )}
            </footer>
          )}
        </section>
      </div>
    </div>
  );
}

/* ------------------------------------------------------------------ */
/* history-sidebar                                                     */
/* ------------------------------------------------------------------ */

function HistoryList({ history, t, onPick, active }: { history: NonNullable<AiChatProps['history']>; t: Texts; onPick: (id: string) => void; active: string }) {
  const [q, setQ] = useState('');
  const id = useId();
  const list = history.filter((h) => h.title.toLowerCase().includes(q.trim().toLowerCase()));
  const groups = Array.from(new Set(list.map((h) => h.group)));
  // The highlight glides to the picked chat, the list closes ranks while searching
  const nav = useGlide<HTMLElement>(active);
  const rows = useFlip<HTMLElement>(list);
  return (
    <>
      <div className="relative mx-3 flex h-9 items-center">
        <label htmlFor={`${id}-s`} className="sr-only">
          {t.searchChats}
        </label>
        <Icon name="search" size={15} className="pointer-events-none absolute left-2.5 text-muted-foreground" />
        <input id={`${id}-s`} type="search" value={q} onChange={(e) => setQ(e.target.value)} placeholder={t.searchChats} className="h-full w-full rounded-lg border border-border bg-background pl-8 pr-2 text-[13px] text-foreground outline-none placeholder:text-subtle-foreground focus:border-border-strong" />
      </div>
      <nav
        ref={(el) => {
          nav.current = el;
          rows.current = el;
        }}
        aria-label={t.history}
        className="kit-scrollbar relative mt-2 min-h-0 flex-1 overflow-y-auto px-3 pb-3"
      >
        {groups.map((g) => (
          <div key={g} className="mt-3">
            <p className="px-2.5 pb-1 text-[11.5px] font-medium text-subtle-foreground">{g}</p>
            <ul className="space-y-0.5">
              {list
                .filter((h) => h.group === g)
                .map((h) => (
                  <li key={h.id} data-flip={h.id}>
                    <button
                      type="button"
                      onClick={() => onPick(h.id)}
                      aria-current={h.id === active ? 'page' : undefined}
                      className={cn('relative flex min-h-9 w-full items-center rounded-lg px-2.5 text-left text-[13px] transition-colors duration-200', h.id === active ? 'font-medium text-foreground' : 'text-muted-foreground hover:bg-[color-mix(in_oklab,var(--accent)_60%,transparent)] hover:text-foreground')}
                    >
                      {h.id === active && <span data-glide aria-hidden className="absolute inset-0 rounded-lg bg-accent" />}
                      <span className="relative truncate">{h.title}</span>
                    </button>
                  </li>
                ))}
            </ul>
          </div>
        ))}
        {!list.length && <p className="px-2.5 py-6 text-[13px] text-muted-foreground">{t.noChats}</p>}
      </nav>
    </>
  );
}

function HistorySidebar({ t, assistant, messages = [], history = [], placeholder, respond, models, className }: P) {
  const c = useConversation(messages, respond, t.fallback);
  const [active, setActive] = useState(history.find((h) => h.active)?.id ?? history[0]?.id ?? '');
  const [sheet, setSheet] = useState(false);
  const dlg = useRef<HTMLDialogElement>(null);
  useEffect(() => {
    const d = dlg.current;
    if (!d) return;
    if (sheet && !d.open) d.showModal();
    if (!sheet && d.open) d.close();
  }, [sheet]);
  const current = history.find((h) => h.id === active);
  const pick = (hid: string) => {
    setActive(hid);
    setSheet(false);
    if (hid !== (history.find((h) => h.active)?.id ?? history[0]?.id)) c.setMessages([]);
    else c.setMessages(messages);
  };
  const newChat = (
    <Button variant="outline" size="sm" iconLeft="edit" className="w-full justify-start" onClick={() => (setActive(''), c.setMessages([]), setSheet(false))}>
      {t.newChat}
    </Button>
  );
  return (
    <div className={cn('flex h-dvh bg-background', className)}>
      <aside className="hidden w-[17rem] shrink-0 flex-col border-r border-border bg-surface md:flex">
        <div className="flex h-14 items-center gap-2.5 px-4">
          <AssistantAvatar assistant={assistant} size="sm" />
          <span className="text-[14px] font-semibold text-foreground">{assistant.name}</span>
        </div>
        <div className="px-3 pb-3">{newChat}</div>
        <HistoryList history={history} t={t} onPick={pick} active={active} />
      </aside>
      <dialog
        ref={dlg}
        onClose={() => setSheet(false)}
        onClick={(e) => e.target === dlg.current && setSheet(false)}
        aria-label={t.history}
        className="m-0 h-dvh max-h-none w-[min(20rem,86vw)] max-w-none border-r border-border bg-surface p-0 text-foreground shadow-[var(--shadow-lg)] backdrop:bg-scrim open:flex open:flex-col open:animate-[kit-rise_0.3s_var(--ease-kit)]"
      >
        <div className="flex h-14 shrink-0 items-center gap-2 px-3">
          <span className="flex-1 px-1 text-[14px] font-semibold">{t.history}</span>
          <button type="button" onClick={() => setSheet(false)} aria-label={t.closeHistory} className="grid size-10 place-items-center rounded-lg text-muted-foreground hover:bg-accent hover:text-foreground">
            <Icon name="x" size={18} />
          </button>
        </div>
        <div className="px-3 pb-3">{newChat}</div>
        <HistoryList history={history} t={t} onPick={pick} active={active} />
      </dialog>
      <main className="flex min-w-0 flex-1 flex-col">
        <header className="flex h-14 shrink-0 items-center gap-2 border-b border-border px-2 sm:px-4">
          <button type="button" onClick={() => setSheet(true)} aria-label={t.openHistory} aria-expanded={sheet} className="grid size-11 place-items-center rounded-lg text-muted-foreground hover:bg-accent hover:text-foreground md:hidden">
            <Icon name="panel-left" size={19} />
          </button>
          <h1 className="min-w-0 flex-1 truncate text-[14px] font-medium text-foreground">{current?.title ?? t.newChat}</h1>
          {assistant.model && <span className="rounded-md bg-muted px-2 py-1 text-[12px] text-muted-foreground">{assistant.model}</span>}
        </header>
        <div className="kit-scrollbar min-h-0 flex-1 overflow-y-auto [mask-image:linear-gradient(to_bottom,transparent,#000_2rem)]">
          <div key={active || 'new'} className="kitm-in mx-auto max-w-[44rem] px-4 py-8 [--kitm-t:.45s] sm:px-6">
            {c.messages.length ? (
              <Messages messages={c.messages} state={c.state} assistant={assistant} t={t} />
            ) : (
              <div className="grid min-h-[40dvh] place-items-center text-center">
                <div>
                  <AssistantAvatar assistant={assistant} size="lg" />
                  <p className="mt-4 text-[17px] font-semibold text-foreground">{t.newChat}</p>
                </div>
              </div>
            )}
          </div>
        </div>
        <div className="mx-auto w-full max-w-[44rem] shrink-0 px-3 pb-3 sm:px-6 sm:pb-5">
          <Composer t={t} onSend={c.send} onStop={c.stop} busy={c.state !== 'idle'} placeholder={placeholder ?? fill(t.messageTo, { name: assistant.name })} models={models} />
        </div>
      </main>
    </div>
  );
}

/* ------------------------------------------------------------------ */
/* answer-with-sources                                                 */
/* ------------------------------------------------------------------ */

function Favicon({ site }: { site: string }) {
  return (
    <span className="grid size-5 shrink-0 place-items-center rounded-[5px] bg-[color-mix(in_oklab,var(--primary)_16%,var(--muted))] text-[10px] font-bold uppercase text-foreground" aria-hidden>
      {site.replace(/^www\./, '')[0]}
    </span>
  );
}

function AnswerWithSources({ t, assistant, question, answer = [], sources = [], related = [], respond, placeholder, className }: P) {
  const [hot, setHot] = useState<number | null>(null);
  // Which citation the pointer or focus is on: its source shows as a small card above it
  const [peek, setPeek] = useState<string | null>(null);
  const c = useConversation([], respond, t.fallback);
  const uid = useId();
  const [answerScope, answerEnter] = useEnter<HTMLDivElement>();
  return (
    <div className={cn('min-h-dvh bg-background', className)}>
      <article className="mx-auto max-w-[46rem] px-4 pb-40 pt-10 sm:px-6 sm:pt-16">
        <h1 className="kit-rise text-balance text-[clamp(1.625rem,1.3rem+1.4vw,2.375rem)] font-semibold leading-tight tracking-[-0.035em] text-foreground">{question}</h1>

        <section aria-labelledby={`${uid}-s`} className="kit-rise mt-8 [--kit-delay:80ms]">
          <h2 id={`${uid}-s`} className="flex items-center gap-2 text-[13px] font-semibold text-foreground">
            <Icon name="layers" size={15} className="text-muted-foreground" />
            {t.sources}
          </h2>
          <ol className="kit-no-scrollbar max-sm:kit-fade-x -mx-4 mt-3 flex gap-2.5 overflow-x-auto px-4 sm:mx-0 sm:grid sm:grid-cols-2 sm:overflow-visible sm:px-0 lg:grid-cols-4">
            {sources.map((s, i) => (
              <li key={s.id} className="kit-rise w-[15rem] shrink-0 sm:w-auto" style={{ '--kit-delay': `${140 + i * 70}ms` } as React.CSSProperties}>
                <a
                  href={s.href}
                  onPointerEnter={() => setHot(s.id)}
                  onPointerLeave={() => setHot(null)}
                  onFocus={() => setHot(s.id)}
                  onBlur={() => setHot(null)}
                  className={cn('flex h-full flex-col rounded-xl border bg-card p-3 shadow-[var(--highlight),var(--shadow-sm)] transition-[border-color,box-shadow,transform] duration-300 ease-[var(--ease-kit)]', hot === s.id ? '-translate-y-0.5 border-primary shadow-[var(--highlight),0_0_0_3px_var(--glow)] motion-reduce:translate-y-0' : 'border-border hover:border-border-strong')}
                >
                  <span className="line-clamp-2 text-[13px] font-medium leading-snug text-foreground">{s.title}</span>
                  <span className="mt-auto flex items-center gap-1.5 pt-3 text-[12px] text-muted-foreground">
                    <Favicon site={s.site} />
                    <span className="truncate">{s.site}</span>
                    <span className="ml-auto tabular-nums text-subtle-foreground">{s.id}</span>
                  </span>
                </a>
              </li>
            ))}
          </ol>
        </section>

        <section aria-labelledby={`${uid}-a`} className="kit-rise mt-10 [--kit-delay:160ms]">
          <h2 id={`${uid}-a`} className="flex items-center gap-2 text-[13px] font-semibold text-foreground">
            <AssistantAvatar assistant={assistant} size="sm" />
            {t.answer}
          </h2>
          <div ref={answerScope} {...answerEnter} className="mt-4 space-y-4 text-pretty text-[16px] leading-[1.7] text-foreground/90">
            {answer.map((p, i) => (
              <p key={i} className="kitm-up" style={{ '--kitm-d': `${300 + i * 120}ms` } as React.CSSProperties}>
                {inline(p.text)}
                {p.cites?.map((n) => {
                  const s = sources.find((x) => x.id === n);
                  const key = `${i}-${n}`;
                  return (
                    <span key={n} className="relative inline-block">
                      <a
                        href={s?.href ?? '#'}
                        aria-label={`${fill(t.source, { n })}: ${s?.title ?? ''}`}
                        onPointerEnter={() => (setHot(n), setPeek(key))}
                        onPointerLeave={() => (setHot(null), setPeek(null))}
                        onFocus={() => (setHot(n), setPeek(key))}
                        onBlur={() => (setHot(null), setPeek(null))}
                        className={cn('relative -top-px ml-1 inline-grid h-5 min-w-5 place-items-center rounded-md px-1 align-middle text-[11px] font-semibold tabular-nums transition-colors', hot === n ? 'bg-primary text-primary-foreground' : 'bg-muted text-muted-foreground hover:bg-accent hover:text-foreground')}
                      >
                        {n}
                      </a>
                      {/* Preview of the source, fine pointers and keyboard; on touch the source cards above do the same */}
                      {peek === key && s && (
                        <span aria-hidden className="kitm-in pointer-events-none absolute bottom-full left-1/2 z-20 mb-2 hidden w-64 -translate-x-1/2 rounded-xl border border-border bg-popover p-3 text-left text-[12.5px] leading-snug shadow-[var(--highlight),var(--shadow-lg)] [--kitm-t:.25s] sm:block">
                          <span className="flex items-center gap-1.5 text-muted-foreground">
                            <Favicon site={s.site} />
                            <span className="truncate">{s.site}</span>
                          </span>
                          <span className="mt-1.5 block font-medium text-foreground">{s.title}</span>
                          <span className="mt-1 line-clamp-3 block text-muted-foreground">{s.snippet}</span>
                        </span>
                      )}
                    </span>
                  );
                })}
              </p>
            ))}
          </div>
          <MessageActions text={answer.map((a) => a.text).join('\n\n')} t={t} />
        </section>

        {c.messages.length > 0 && <Messages messages={c.messages} state={c.state} assistant={assistant} t={t} className="mt-10 border-t border-border pt-10" />}

        {related.length > 0 && c.messages.length === 0 && (
          <section aria-labelledby={`${uid}-r`} className="mt-10">
            <h2 id={`${uid}-r`} className="flex items-center gap-2 text-[13px] font-semibold text-foreground">
              <Icon name="list" size={15} className="text-muted-foreground" />
              {t.related}
            </h2>
            <ul className="mt-2 divide-y divide-border border-y border-border">
              {related.map((r) => (
                <li key={r}>
                  <button type="button" onClick={() => c.send(r)} className="group flex min-h-12 w-full items-center gap-3 py-2 text-left text-[14.5px] text-foreground">
                    <span className="flex-1 transition-transform duration-300 ease-[var(--ease-kit)] group-hover:translate-x-1 motion-reduce:group-hover:translate-x-0">{r}</span>
                    <Icon name="plus" size={16} className="text-subtle-foreground transition-transform group-hover:rotate-90 group-hover:text-foreground" />
                  </button>
                </li>
              ))}
            </ul>
          </section>
        )}
      </article>
      <div className="fixed inset-x-0 bottom-0 bg-[linear-gradient(to_top,var(--background)_55%,transparent)] px-3 pb-3 pt-10 sm:pb-6">
        <div className="mx-auto max-w-[46rem]">
          <Composer t={t} onSend={c.send} onStop={c.stop} busy={c.state !== 'idle'} placeholder={placeholder ?? t.followUp} />
        </div>
      </div>
    </div>
  );
}

/* ------------------------------------------------------------------ */
/* voice-widget                                                        */
/* ------------------------------------------------------------------ */

function Wave({ active }: { active: boolean }) {
  const bars = [0.35, 0.6, 0.9, 0.55, 1, 0.7, 0.45, 0.8, 0.5, 0.3, 0.65, 0.4];
  return (
    <span className="flex h-10 items-center gap-[3px]" aria-hidden>
      <style>{'@keyframes kit-wave{0%,100%{transform:scaleY(.35)}50%{transform:scaleY(1)}}'}</style>
      {bars.map((b, i) => (
        <span
          key={i}
          className={cn('w-[3px] rounded-full transition-[height,opacity,background-color] duration-300 motion-reduce:animate-none', active ? 'bg-primary' : 'bg-border-strong')}
          style={{ height: `${Math.round(b * 100)}%`, animation: active ? `kit-wave ${0.7 + (i % 4) * 0.15}s ease-in-out ${i * 60}ms infinite` : undefined, transform: active ? undefined : 'scaleY(0.45)' }}
        />
      ))}
    </span>
  );
}

function VoiceWidget({ t, assistant, suggestions = [], defaultOpen = false, respond, className }: P) {
  const [open, setOpen] = useState(defaultOpen);
  const [listening, setListening] = useState(false);
  const [heard, setHeard] = useState('');
  const [nudge, setNudge] = useState(false);
  const c = useConversation([], respond ?? (() => t.voiceReply), t.voiceReply);
  // A short hello next to the closed launcher after a moment, once
  useEffect(() => {
    if (open) return setNudge(false);
    const timer = setTimeout(() => setNudge(true), 1800);
    return () => clearTimeout(timer);
  }, [open]);
  const panel = useRef<HTMLDivElement>(null);
  const launcher = useRef<HTMLButtonElement>(null);
  const id = useId();

  useEffect(() => {
    if (!listening) return;
    if (prefersReducedMotion()) {
      setHeard(t.heard);
      return;
    }
    let i = 0;
    const words = t.heard.split(' ');
    const timer = setInterval(() => {
      i++;
      setHeard(words.slice(0, i).join(' '));
      if (i >= words.length) {
        clearInterval(timer);
        setTimeout(() => {
          setListening(false);
          c.send(t.heard);
          setHeard('');
        }, 500);
      }
    }, 260);
    return () => clearInterval(timer);
  }, [listening]); // eslint-disable-line react-hooks/exhaustive-deps

  useEffect(() => {
    if (!open) return;
    const onKey = (e: KeyboardEvent) => {
      if (e.key === 'Escape') {
        setOpen(false);
        launcher.current?.focus();
      }
    };
    document.addEventListener('keydown', onKey);
    return () => document.removeEventListener('keydown', onKey);
  }, [open]);

  return (
    <div className={cn('fixed bottom-4 right-4 z-50 flex flex-col items-end gap-3 sm:bottom-6 sm:right-6', className)}>
      <div
        ref={panel}
        id={id}
        role="dialog"
        aria-label={assistant.name}
        inert={!open}
        className={cn(
          'flex max-h-[min(36rem,calc(100dvh-7rem))] w-[min(23rem,calc(100vw-2rem))] origin-bottom-right flex-col overflow-hidden rounded-2xl border border-border bg-popover shadow-[var(--highlight),var(--shadow-lg)] transition-[opacity,transform,visibility] duration-300 ease-[var(--ease-kit)] motion-reduce:transition-none',
          open ? 'visible scale-100 opacity-100' : 'invisible translate-y-2 scale-95 opacity-0',
        )}
      >
        <header className="relative flex items-center gap-3 overflow-hidden border-b border-border p-4">
          <div aria-hidden data-clip-ok className="pointer-events-none absolute -right-10 -top-12 size-36 rounded-full bg-[var(--glow)] blur-2xl" />
          <AssistantAvatar assistant={assistant} />
          <div className="relative min-w-0 flex-1">
            <p className="truncate text-[14.5px] font-semibold text-foreground">{assistant.name}</p>
            <p className="flex items-center gap-1.5 text-[12px] text-muted-foreground">
              <LiveDot />
              {t.online}
            </p>
          </div>
          <button type="button" onClick={() => (setOpen(false), launcher.current?.focus())} aria-label={t.closeAssistant} className="relative grid size-10 place-items-center rounded-lg text-muted-foreground hover:bg-accent hover:text-foreground">
            <Icon name="chevron-down" size={18} />
          </button>
        </header>
        <div className="kit-scrollbar min-h-0 flex-1 overflow-y-auto p-4">
          {c.messages.length === 0 ? (
            <div>
              <p className="text-pretty text-[14px] leading-relaxed text-foreground/90">{t.tapToTalk}</p>
              <ul className="mt-3 grid gap-1.5">
                {suggestions.map((s, i) => (
                  <li key={s.label} className={open ? 'kitm-up' : ''} style={{ '--kitm-d': `${150 + i * 60}ms` } as React.CSSProperties}>
                    <button type="button" onClick={() => c.send(s.prompt ?? s.label)} className="flex min-h-11 w-full items-center gap-2.5 rounded-xl border border-border bg-background px-3 text-left text-[13.5px] text-foreground transition-colors hover:border-border-strong">
                      {s.icon && <Icon name={s.icon} size={16} className="text-muted-foreground" />}
                      {s.label}
                    </button>
                  </li>
                ))}
              </ul>
            </div>
          ) : (
            <Messages messages={c.messages} state={c.state} assistant={assistant} t={t} className="space-y-4 [&_.size-8]:size-7" />
          )}
        </div>
        <div className="border-t border-border p-3">
          <div className={cn('mb-3 flex flex-col items-center gap-2 rounded-xl bg-surface p-3 transition-colors', listening && 'bg-[color-mix(in_oklab,var(--primary)_7%,var(--surface))]')}>
            <Wave active={listening} />
            <p className="min-h-5 text-center text-[13px] text-muted-foreground" aria-live="polite">
              {listening && heard
                ? heard.split(' ').map((w, i) => (
                    <span key={i} className="kitm-in inline-block text-foreground [--kitm-t:.3s]">
                      {w}&nbsp;
                    </span>
                  ))
                : listening
                  ? t.listening
                  : t.listen}
            </p>
            <button
              type="button"
              onClick={() => setListening((l) => !l)}
              aria-pressed={listening}
              aria-label={listening ? t.stopListening : t.listen}
              className={cn('relative grid size-14 place-items-center rounded-full shadow-[var(--shadow-md)] transition-[background-color,transform] active:scale-95', listening ? 'bg-destructive text-destructive-foreground' : 'bg-primary text-primary-foreground')}
            >
              {listening && <span className="absolute inset-0 animate-ping rounded-full bg-destructive opacity-30 motion-reduce:hidden" aria-hidden />}
              <Icon name={listening ? 'stop' : 'mic'} size={22} className={listening ? 'fill-current' : ''} />
            </button>
          </div>
          <form
            onSubmit={(e) => {
              e.preventDefault();
              const input = e.currentTarget.elements.namedItem('q') as HTMLInputElement;
              c.send(input.value);
              input.value = '';
            }}
            className="flex items-center gap-1.5"
          >
            <label htmlFor={`${id}-q`} className="sr-only">
              {t.typeInstead}
            </label>
            <input id={`${id}-q`} name="q" autoComplete="off" placeholder={t.typeInstead} className="h-10 min-w-0 flex-1 rounded-lg border border-input bg-background px-3 text-[14px] text-foreground outline-none placeholder:text-subtle-foreground focus:border-border-strong" />
            <button type="submit" aria-label={t.send} className="grid size-10 place-items-center rounded-lg bg-foreground text-background">
              <Icon name="send" size={16} />
            </button>
          </form>
        </div>
      </div>
      {nudge && !open && (
        <div className="kitm-fly relative flex max-w-[16rem] items-center gap-2 rounded-2xl rounded-br-md border border-border bg-popover py-2 pl-3.5 pr-1.5 text-[13.5px] text-foreground shadow-[var(--highlight),var(--shadow-lg)]" role="status">
          <button type="button" onClick={() => setOpen(true)} className="text-left">
            {t.nudge}
          </button>
          <button type="button" onClick={() => setNudge(false)} aria-label={t.dismiss} className="grid size-8 shrink-0 place-items-center rounded-lg text-muted-foreground hover:bg-accent hover:text-foreground">
            <Icon name="x" size={14} />
          </button>
        </div>
      )}
      <button
        ref={launcher}
        type="button"
        onClick={() => setOpen((o) => !o)}
        aria-expanded={open}
        aria-controls={id}
        aria-label={open ? t.closeAssistant : t.openAssistant}
        className="group relative grid size-14 place-items-center rounded-full bg-primary text-primary-foreground shadow-[inset_0_1px_0_rgb(255_255_255/0.2),var(--shadow-lg)] transition-transform hover:scale-105 active:scale-95 motion-reduce:hover:scale-100"
      >
        <Icon key={String(open)} name={open ? 'x' : 'sparkle'} size={22} className="kitm-in transition-transform duration-300 group-hover:rotate-12 [--kitm-t:.3s]" />
      </button>
    </div>
  );
}

/* ------------------------------------------------------------------ */

/**
 * AI surfaces: a chat window, a large prompt composer, agent steps with
 * approvals, chats with history, an answer with sources and a compact voice
 * widget. Replies stream in, Enter sends, Shift Enter adds a line.
 */
export function AiChat({ variant = 'chat-window', labels, ...props }: AiChatProps) {
  const t = useTexts(TEXTS, labels);
  const p: P = { ...props, t };
  const body = (() => {
    switch (variant) {
      case 'prompt-composer':
        return <PromptComposer {...p} />;
      case 'agent-steps':
        return <AgentSteps {...p} />;
      case 'history-sidebar':
        return <HistorySidebar {...p} />;
      case 'answer-with-sources':
        return <AnswerWithSources {...p} />;
      case 'voice-widget':
        return <VoiceWidget {...p} />;
      default:
        return <ChatWindow {...p} />;
    }
  })();
  return (
    <>
      <KitmStyle />
      {body}
    </>
  );
}