import { useCallback, useEffect, useRef, useState } from 'react';
import { ArrowUp, ChevronDown, ChevronRight, Loader2 } from 'lucide-react';
import { useAuthStore } from '@/stores/auth';
import { teacherApi, teacherTopicsPath, legacyTopicBase } from '@/lib/coding-teacher';
import type {
  TeacherDefinition,
  TeacherCatalog,
  TeacherReference,
  TeacherSend,
  TeacherTopic,
  TeacherTopicList,
} from '../../../shared/coding-teacher';
import { TeacherDiscussionPanel, DiscussionFocus } from './TeacherDiscussionPanel';
import type { TeacherDiscussionAction } from '../../../shared/coding-teacher';
import { TeacherAvatar } from './TeacherAvatar';
import { TeacherReply } from './TeacherReply';

export function TeacherChatPanel({
  projectId,
  sourceId,
  onBringBack,
  quote,
  draftRevision,
  sampleContext,
  externalTopic,
  onTopicChange,
  onComposingChange,
  selectedAgent,
}: {
  projectId: string;
  sourceId: string;
  onBringBack?(text: string): void;
  quote?: TeacherReference;
  draftRevision?: number;
  sampleContext?: string;
  projectName?: string;
  externalTopic?: TeacherTopic | null;
  onTopicChange?(topic: TeacherTopic): void;
  onComposingChange?(composing: boolean): void;
  selectedAgent?: TeacherCatalog['items'][number];
}) {
  const base = teacherTopicsPath(projectId);
  const account = useAuthStore((state) => state.user?.userId ?? state.user?.username ?? 'signed-out');
  const projectDraftKey = `makelore-consultation-draft:${account}:${projectId}:teacher`;
  const draftKey = !draftRevision ? selectedAgent ? `makelore-consultation-draft:${account}:${projectId}:agent:${selectedAgent.teacher_id}` : projectDraftKey : null;
  const [saved] = useState<{ text?: string; references?: TeacherReference[]; pending?: TeacherSend }>(() => {
    try { return draftKey ? JSON.parse(localStorage.getItem(draftKey) ?? '{}') : {}; } catch { return {}; }
  });
  const [legacyDraft] = useState<{ text?: string; references?: TeacherReference[] }>(() => {
    try { return draftKey ? JSON.parse(localStorage.getItem(`makelore-consultation-draft:${account}:${projectId}:friend`) ?? '{}') : {}; } catch { return {}; }
  });
  const [unassignedDraft] = useState<{ text?: string; references?: TeacherReference[] }>(() => {
    try { return selectedAgent ? JSON.parse(localStorage.getItem(projectDraftKey) ?? '{}') : {}; } catch { return {}; }
  });
  const persistDraft = useCallback((text: string, references: TeacherReference[], pending?: TeacherSend | null) => {
    if (!draftKey) return;
    try { localStorage.setItem(draftKey, JSON.stringify({ text, references, pending })); } catch { /* Draft remains in the open panel. */ }
  }, [draftKey]);
  const label = '智能体';
  const discussionEnabled = !draftRevision;
  const [historyOpen, setHistoryOpen] = useState(false);
  const [focus, setFocus] = useState<{ topicId: string; id: string; label: string } | null>(null);
  const [definition, setDefinition] = useState<TeacherDefinition | null>(null);
  const externalTopicRef = useRef(externalTopic);
  externalTopicRef.current = externalTopic;
  const selectedAgentId = selectedAgent?.teacher_id;
  const selectedAgentRef = useRef(selectedAgent);
  selectedAgentRef.current = selectedAgent;
  const inputRef = useRef<HTMLTextAreaElement>(null);
  const focusedOnce = useRef(false);
  const [topics, setTopics] = useState<TeacherTopicList>({ items: [], lastSelectedTopicId: null });
  const [topic, setTopic] = useState<TeacherTopic | null>(null);
  const legacyFriend = topic?.role === 'friend';
  const topicBase = legacyTopicBase(base, legacyFriend);
  const [text, setText] = useState(saved.text ?? '');
  const [references, setReferences] = useState<TeacherReference[]>(quote ? [quote] : saved.references ?? []);
  useEffect(() => { onComposingChange?.(Boolean(text.trim() || references.length)); }, [text, references.length, onComposingChange]);
  useEffect(() => () => onComposingChange?.(false), [onComposingChange]);
  const draftRef = useRef({ text, references });
  draftRef.current = { text, references };
  const [error, setError] = useState('');
  const [busy, setBusy] = useState(true);
  const [enabled, setEnabled] = useState(false);
  const [legacyEnabled, setLegacyEnabled] = useState(false);
  const [teachers, setTeachers] = useState<TeacherCatalog['items']>([]);
  const [selectedTeacherVersion, setSelectedTeacherVersion] = useState<number>();
  const topicEnabled = legacyFriend ? false : !topic ? enabled
    : topic.definition.config_id
      ? teachers.some((item) => item.teacher_id === topic.definition.config_id)
      : legacyEnabled;
  const pending = useRef<TeacherSend | null>(saved.pending ?? null);
  useEffect(() => {
    persistDraft(text, references, pending.current);
  }, [text, references, persistDraft]);
  const generation = useRef(0);
  const topicRef = useRef(topic);
  topicRef.current = topic;
  const scrollRef = useRef<HTMLDivElement>(null);
  const content = topic?.discussion?.content;
  const activeFocus = focus && focus.topicId === topic?.id && content && topic?.discussion?.status === 'active' && (
    content.kind === 'ideas' ? content.items.some(item => item.id === focus.id)
      : content.kind === 'comparison' ? content.rows.some(row => content.columns.some(column => `${row.id}:${column.id}` === focus.id))
        : content.nodes.some(node => node.id === focus.id)
  ) ? focus : null;
  useEffect(() => {
    const pane = scrollRef.current;
    if (pane) pane.scrollTop = pane.scrollHeight;
  }, [topic?.id, topic?.revision]);
  const consume = useCallback(
    (next: TeacherTopic) => {
      if (pending.current && next.requests.some((request) => request.id === pending.current?.requestId)) {
        pending.current = null;
        persistDraft(draftRef.current.text, draftRef.current.references);
      }
      setTopic((current) =>
        current?.id === next.id && current.revision > next.revision ? current : next
      );
    },
    [persistDraft]
  );
  useEffect(() => {
    if (externalTopic && externalTopic.projectId === projectId
      && (!selectedAgentId || externalTopic.definition.config_id === selectedAgentId)) {
      consume(externalTopic);
      setDefinition(externalTopic.definition);
    }
  }, [externalTopic, projectId, consume, selectedAgentId]);
  useEffect(() => { if (topic) onTopicChange?.(topic); }, [topic, onTopicChange]);
  useEffect(() => {
    if (!busy && !focusedOnce.current) {
      focusedOnce.current = true;
      inputRef.current?.focus();
    }
  }, [busy]);
  useEffect(() => {
    if (quote) setReferences([quote]);
  }, [quote]);
  useEffect(() => {
    let alive = true;
    setBusy(true);
    void (async () => {
      try {
        const config = draftRevision
          ? { definition: (await teacherApi.preview(draftRevision)).payload, enabled: true }
          : await teacherApi.config();
        if (alive) {
          setDefinition(config.definition);
          setEnabled(config.enabled);
          setLegacyEnabled(config.enabled);
        }
        if (!draftRevision) {
          const catalog = await teacherApi.catalog();
          if (alive) {
            setTeachers(catalog.items);
            const selected = selectedAgentId
              ? catalog.items.find((item) => item.teacher_id === selectedAgentId)
              : catalog.items.find((item) => item.is_default) ?? catalog.items[0];
            setSelectedTeacherVersion(selected?.version);
            setEnabled(selectedAgentId ? Boolean(selected) : catalog.items.length > 0 || (config.enabled && !config.definition?.config_id));
            const visibleAgent = selected ?? selectedAgentRef.current;
            if (visibleAgent) setDefinition(visibleAgent.definition);
          }
        }
      } catch (e) {
        if (alive) setError(e instanceof Error ? e.message : `${label}配置暂不可用`);
      }
      try {
        const listed = await teacherApi.list(base);
        if (!alive) return;
        setTopics(listed);
        const previous = listed.items.find((item) => item.id === listed.lastSelectedTopicId
          && (!selectedAgentId || item.teacherId === selectedAgentId))
          ?? (selectedAgentId ? listed.items.find((item) => item.teacherId === selectedAgentId) : undefined);
        if (externalTopicRef.current && (!selectedAgentId || externalTopicRef.current.definition.config_id === selectedAgentId)) {
          consume(externalTopicRef.current);
          setDefinition(externalTopicRef.current.definition);
        } else if (previous) {
          const current = await teacherApi.read(base, previous.id);
          if (alive && (!draftRevision || current.draftRevision === draftRevision)) {
            consume(current);
            setDefinition(current.definition);
          }
        }
      } catch (e) {
        if (alive) setError(e instanceof Error ? e.message : `${label}历史暂不可用`);
      } finally {
        if (alive) setBusy(false);
      }
    })();
    return () => {
      alive = false;
      // This numeric epoch invalidates outstanding requests on unmount; it is not a DOM ref.
      // eslint-disable-next-line react-hooks/exhaustive-deps
      generation.current++;
    };
  }, [base, draftRevision, label, consume, selectedAgentId]);
  useEffect(() => {
    if (!topic?.id || legacyFriend) return;
    const streamTopicId = topic.id;
    let closed = false,
      stream: EventSource | undefined;
    void teacherApi
      .events(topicBase, topic.id)
      .then((source) => {
        if (closed) {
          source.close();
          return;
        }
        stream = source;
        source.addEventListener('snapshot', (event) => {
          if (closed) return;
          const next = JSON.parse((event as MessageEvent).data) as TeacherTopic;
          setTopic((current) =>
            current?.id === streamTopicId &&
            next.id === streamTopicId &&
            current.revision <= next.revision
              ? next
              : current
          );
        });
        source.onerror = () => {
          if (!closed) setError(`连接暂时中断，正在恢复${label}回复。`);
        };
        source.onopen = () => {
          if (!closed) setError('');
        };
      })
      .catch((e) => {
        if (!closed) setError(e instanceof Error ? e.message : `连接${label}失败`);
      });
    return () => {
      closed = true;
      stream?.close();
    };
  }, [topicBase, topic?.id, legacyFriend, consume, label]);
  const choose = async (id: string) => {
    const version = ++generation.current;
    setBusy(true);
    setError('');
    try {
      const next = await teacherApi.read(legacyTopicBase(base, topics.items.some(item => item.id === id && item.legacyRole === 'friend')), id);
      if (version === generation.current) {
        consume(next);
        setDefinition(next.definition);
        pending.current = null;
      }
    } catch (e) {
      if (version === generation.current) setError(e instanceof Error ? e.message : '加载失败');
    } finally {
      if (version === generation.current) setBusy(false);
    }
  };
  const newTopic = async () => {
    const version = ++generation.current;
    setBusy(true);
    setError('');
    try {
      const next = await teacherApi.create(
        base,
        draftRevision,
        sampleContext,
        selectedTeacherVersion
      );
      if (version === generation.current) {
        consume(next);
        setDefinition(next.definition);
        setTopics(await teacherApi.list(base));
        pending.current = null;
      }
    } catch (e) {
      if (version === generation.current)
        setError(e instanceof Error ? e.message : `无法新建${label}话题`);
    } finally {
      if (version === generation.current) setBusy(false);
    }
  };
  const send = async (action?: Pick<TeacherSend, 'text' | 'intent' | 'discussion'>) => {
    const question = action?.text ?? text;
    const questionReferences = action ? [] : references;
    if (!question.trim() || busy || !topicEnabled || topicRef.current?.requests.some((request) => ['preparing', 'running'].includes(request.status))) return;
    const version = generation.current;
    setBusy(true);
    setError('');
    let current = topicRef.current;
    try {
      if (!current) {
        current = await teacherApi.create(
          base,
          draftRevision,
          sampleContext,
          selectedTeacherVersion
        );
        if (version !== generation.current) return;
        consume(current);
        setDefinition(current.definition);
      }
      const presentation = discussionEnabled && (!action?.intent || action.intent === 'question' || action.intent === 'guided-help') ? 'discussion-v1' as const : undefined;
      const discussion = presentation && current.discussion?.status === 'active'
        ? action?.discussion ?? { toolId: current.discussion.id, revision: current.discussion.revision,
          ...(activeFocus?.topicId === current.id ? { focusId: activeFocus.id } : {}) } : undefined;
      const previous = pending.current && !current.requests.some((request) => request.id === pending.current?.requestId)
        ? pending.current
        : null;
      const input =
        previous &&
        previous.text === question &&
        previous.presentation === presentation &&
        JSON.stringify(previous.discussion) === JSON.stringify(discussion) &&
        (previous.intent ?? 'question') === (action?.intent ?? 'question') &&
        JSON.stringify(previous.references) === JSON.stringify(questionReferences)
          ? previous
          : {
            requestId: crypto.randomUUID(), text: question, references: questionReferences,
            ...(presentation ? { presentation } : {}), ...(discussion ? { discussion } : {}),
            ...(action?.intent ? { intent: action.intent } : {}),
            ...(sourceId ? { sourceConversationId: sourceId } : {}),
          };
      pending.current = input;
      persistDraft(text, references, input);
      const next = await teacherApi.send(topicBase, current.id, input);
      if (version !== generation.current) return;
      consume(next);
      pending.current = null;
      if (action) {
        persistDraft(text, references);
      } else {
        setText('');
        setReferences([]);
        persistDraft('', []);
      }
      setTopics(await teacherApi.list(base));
    } catch (e) {
      if (version === generation.current)
        setError(e instanceof Error ? e.message : '提问失败，请保留问题后重试');
    } finally {
      if (version === generation.current) setBusy(false);
    }
  };
  const running = topic?.requests.find(
    (request) => request.status === 'preparing' || request.status === 'running'
  );
  const helpUnavailable = busy || !topicEnabled || Boolean(running);
  const updateDiscussion = async (action: TeacherDiscussionAction['action'], itemId?: string) => {
    const current = topicRef.current;
    if (!current?.discussion || helpUnavailable) return;
    const version = generation.current;
    setBusy(true);
    setError('');
    try {
      const next = await teacherApi.updateDiscussion(topicBase, current.id, {
        toolId: current.discussion.id, revision: current.discussion.revision, action, ...(itemId ? { itemId } : {}),
      });
      if (version === generation.current) { consume(next); setFocus(null); }
    } catch (e) {
      if (version === generation.current) setError(e instanceof Error ? e.message : '内容还没更新，请再试一次。');
    } finally { if (version === generation.current) setBusy(false); }
  };
  const focusItem = (id: string, label: string) => {
    if (!topic) return;
    setFocus({ topicId: topic.id, id, label });
    inputRef.current?.focus();
  };
  const structureIdeas = () => {
    if (!topic?.discussion) return;
    setFocus(null);
    void send({ text: '把我留下的想法理一理，看看它们怎么联系。', discussion: {
      toolId: topic.discussion.id, revision: topic.discussion.revision, transition: 'structure',
    } });
  };
  const askForSuggestions = () => void send({ text: '帮我看看', intent: 'suggestions' });
  const askForGuidance = () => void send({ text: '我也说不清，你带我看看', intent: 'guided-help' });
  const changeText = (next: string) => { setText(next); persistDraft(next, references, pending.current); };
  const removeReferences = () => { setReferences([]); persistDraft(text, [], pending.current); };
  const questions = definition?.suggested_questions ?? [];
  return (
    <aside className="consultation-pane flex h-full min-h-0 w-full flex-col"
      data-testid="teacher-chat-panel" aria-label={`${label}聊天`}>
      <header className="consultation-header flex h-[68px] shrink-0 items-center gap-3 px-5">
        <TeacherAvatar className="consultation-avatar h-9 w-9 rounded-xl" definition={definition} />
        <div className="min-w-0 flex-1"><h2 className="truncate text-sm font-semibold">{definition?.name ?? '智能体'}</h2>
          {draftRevision && <p className="mt-1 text-[11px] text-muted-foreground">运营草稿试聊</p>}</div>
      </header>
      {(topics.items.length > 0 || draftRevision) && <div className="px-5 pt-2">
        <button className="text-[11px] text-muted-foreground" onClick={() => setHistoryOpen(!historyOpen)} aria-expanded={historyOpen}>以往讨论 <ChevronDown className="inline h-3 w-3" /></button>
        {(historyOpen || draftRevision) && <div className="mt-2 flex gap-2">
          <select aria-label={`${label}话题`} value={topic?.id ?? ''} disabled={busy} onChange={(e) => void choose(e.target.value)} className="min-w-0 flex-1 rounded-lg border bg-background p-2 text-xs">
            {!topic && <option value="">选择话题</option>}{topics.items.map((item) => <option key={item.id} value={item.id}>{item.title}{item.legacyRole ? '（旧版，仅查看）' : ''}</option>)}
          </select>
          <button type="button" aria-label={`${label}新话题`} disabled={busy || !enabled} onClick={() => void newTopic()}
            className="shrink-0 rounded-lg px-2 text-xs text-muted-foreground hover:bg-white hover:text-foreground disabled:opacity-40">新话题</button>
        </div>}
      </div>}
      {discussionEnabled && topic?.discussion && <TeacherDiscussionPanel key={topic.id} discussion={topic.discussion}
        disabled={helpUnavailable} focusId={activeFocus?.id}
        onAction={(action, itemId) => void updateDiscussion(action, itemId)} onFocus={focusItem} onStructure={structureIdeas}
        onDiscuss={(id, question) => {
          focusItem(id, question);
          void send({ text: question, discussion: { toolId: topic.discussion!.id, revision: topic.discussion!.revision, focusId: id } });
        }} />}
      <div ref={scrollRef} className="consultation-messages min-h-0 flex-1 overflow-y-auto px-5 py-6">
        {!topic?.requests.length && <div className="flex min-h-full flex-col items-center justify-center pb-5 text-center">
          <TeacherAvatar className="mb-6 h-[68px] w-[68px] rounded-3xl" definition={definition} />
          <h3 className="text-lg font-medium tracking-tight">{definition?.welcome_message || '开始对话'}</h3>
          <div className="mt-6 flex w-full max-w-64 flex-col gap-2">{questions.map((question) => <button key={question} onClick={() => changeText(question)} className="consultation-suggestion flex items-center justify-between gap-2 rounded-lg border bg-white px-3 py-3 text-left text-xs">{question}<ChevronRight className="h-3 w-3 shrink-0 opacity-50" /></button>)}</div>
        </div>}
        {topic?.requests.map((request) => <div key={request.id} className="mb-7 space-y-4">
          {request.intent === 'check-in'
            ? <p className="text-[11px] text-muted-foreground">智能体来看看你的进展</p>
            : <div className="flex justify-end"><p className="consultation-user max-w-[92%] whitespace-pre-wrap break-words rounded-2xl rounded-br-sm px-4 py-3 text-[13px] leading-7">{request.text}</p></div>}
          {request.references.length > 0 && <details className="text-xs text-muted-foreground"><summary>本轮引用 {request.references.length} 项</summary>{request.references.map((ref, index) => <pre className="whitespace-pre-wrap" key={index}>{ref.text}</pre>)}</details>}
          <div className="flex items-center gap-2 text-[11px] text-muted-foreground"><TeacherAvatar definition={definition} className="h-6 w-6 rounded-lg" />{definition?.name ?? label}</div>
          {!!request.toolActivity?.length && <details className="text-xs text-muted-foreground">
            <summary className="cursor-pointer">使用了 {request.toolActivity.length} 项工具</summary>
            <ul className="mt-2 space-y-2" aria-label="智能体工具活动">
              {request.toolActivity.map(activity => <li key={activity.id} className="flex items-start justify-between gap-3">
                <span>{activity.name === 'list_project_files' ? '查看项目文件列表' : activity.name === 'read_project_file' ? '读取项目文件' : activity.name === 'read_conversation' ? '读取会话原文' : '使用智能体工具'}</span>
                <span className="shrink-0">{activity.status === 'completed' ? '已完成' : activity.status === 'failed' ? '未完成'
                  : ['running', 'preparing'].includes(request.status) ? '进行中' : '未收到执行结果'}</span>
              </li>)}
            </ul>
          </details>}
          {request.intent === 'suggestions' ? <>
            {['running', 'preparing'].includes(request.status)
              ? <p role="status" className="flex items-center gap-2 text-[13px] leading-7 text-muted-foreground"><Loader2 className="h-3.5 w-3.5 animate-spin motion-reduce:animate-none" />我看看你最近做到了哪里…</p>
              : request.status === 'completed' && <>
                <TeacherReply text={request.response} />
                <div className="flex flex-col gap-2" aria-label="可以和智能体聊的问题">
                  {request.suggestedQuestions?.map((question) => <button key={question} type="button" disabled={helpUnavailable} onClick={() => void send({ text: question })} className="consultation-suggestion flex min-h-11 items-center justify-between gap-3 rounded-xl border bg-white px-3 py-3 text-left text-[13px] leading-6 transition-colors disabled:cursor-not-allowed disabled:opacity-50">{question}<ChevronRight className="h-3.5 w-3.5 shrink-0 opacity-60" /></button>)}
                </div>
                <button type="button" disabled={helpUnavailable} onClick={askForGuidance} className="consultation-guided-help min-h-10 text-left text-xs leading-6 underline decoration-current/30 underline-offset-4 disabled:cursor-not-allowed disabled:opacity-50">我也说不清，你带我看看</button>
                <p className="text-[11px] leading-5 text-muted-foreground">也可以直接在下面说说你的想法。</p>
              </>}
            {['failed', 'cancelled', 'interrupted'].includes(request.status) && <button type="button" disabled={helpUnavailable} onClick={askForSuggestions} className="consultation-guided-help min-h-10 text-xs underline underline-offset-4 disabled:opacity-50">再请智能体看看</button>}
          </> : request.response ? <TeacherReply text={request.response} /> : <div className="text-[13px] leading-7">{['running', 'preparing'].includes(request.status) ? <span role="status" className="inline-flex items-center gap-2 text-muted-foreground"><Loader2 className="h-3.5 w-3.5 animate-spin motion-reduce:animate-none" />{request.discussionContext ? '正在梳理你的新想法…' : `${label}正在想…`}</span> : ['cancelled', 'interrupted'].includes(request.status) ? '这次先停在这里。想继续时可以再说说。' : ''}</div>}
          {discussionEnabled && request.intent !== 'suggestions' && request.status === 'completed' && topic.discussion?.status !== 'active' && topic.discussion?.status !== 'offered' && Boolean(request.suggestedQuestions?.length) && <div className="flex flex-col gap-2" aria-label="接着聊">
            {request.suggestedQuestions?.map(question => <button type="button" key={question} disabled={helpUnavailable} onClick={() => void send({ text: question })} className="consultation-suggestion rounded-xl border px-3 py-2 text-left text-xs leading-6">{question}<ChevronRight className="ml-1 inline h-3 w-3" /></button>)}
          </div>}
          {request.discussionError && <p className="text-xs leading-6 text-muted-foreground">{request.discussionError}</p>}
          {request.unparsedResponse && <details className="min-w-0 text-xs text-muted-foreground">
            <summary className="cursor-pointer">查看收到的原始内容</summary>
            <pre className="mt-2 max-h-64 overflow-auto whitespace-pre-wrap break-words rounded-lg border p-3">{request.unparsedResponse}</pre>
          </details>}
          {request.progress && ['running', 'preparing'].includes(request.status) && <p role="status" className="text-xs text-muted-foreground">{request.progress}</p>}
          {(request.truncatedMessages ?? 0) > 0 && <p className="text-xs text-muted-foreground">{draftRevision ? '较长的上下文已节选。' : '较长的上下文已节选，智能体可按需读取原文。'}</p>}
          {request.omittedMessages > 0 && <p className="text-[10px] text-muted-foreground">本轮参考了较近的讨论，省略了 {request.omittedMessages} 条较早内容。</p>}
          {request.error && <p className="text-xs text-destructive">{request.error}</p>}
          {onBringBack && request.response && request.intent !== 'suggestions' && request.status === 'completed' && <div className="text-[11px] text-muted-foreground">
            <button onClick={() => onBringBack(request.response)}>带回主会话草稿</button>
          </div>}
        </div>)}
      </div>
      {error && <p role="alert" className="px-5 py-2 text-xs leading-5 text-destructive">{error}</p>}
      {topic?.unsaved && <div className="px-5 py-2 text-xs text-destructive">回复尚未保存，请复制或重试保存。<button className="ml-2 underline" onClick={() => void teacherApi.save(topicBase, topic.id).then(consume).catch(() => setError('保存失败，请先复制回复。'))}>重试保存</button></div>}
      {!topicEnabled && !error && !busy && <p className="px-5 pb-2 text-xs text-muted-foreground">{legacyFriend ? '这是旧版内置朋友的话题，仅供查看。请选择智能体新建话题。' : `${label}暂未开放，历史仍可查看。`}</p>}
      <form className="px-4 pb-4 pt-2" onSubmit={(e) => { e.preventDefault(); void send(); }}>
        {Boolean(unassignedDraft.text?.trim() || unassignedDraft.references?.length) && <details className="mb-2 text-xs text-muted-foreground">
          <summary>查看之前的项目草稿</summary>
          <div className="max-h-40 overflow-auto whitespace-pre-wrap rounded-lg border p-2">
            {unassignedDraft.text}
            {unassignedDraft.references?.map((ref, index) => <pre className="mt-2 whitespace-pre-wrap" key={index}>{ref.text}</pre>)}
          </div>
        </details>}
        {Boolean(legacyDraft.text?.trim() || legacyDraft.references?.length) && <details className="mb-2 text-xs text-muted-foreground">
          <summary>查看旧版朋友草稿</summary>
          <div className="max-h-40 overflow-auto whitespace-pre-wrap rounded-lg border p-2">
            {legacyDraft.text}
            {legacyDraft.references?.map((ref, index) => <pre className="mt-2 whitespace-pre-wrap" key={index}>{ref.text}</pre>)}
          </div>
        </details>}
        {references.length > 0 && <div className="mb-2 rounded-lg bg-white p-3 text-xs"><p className="line-clamp-3 whitespace-pre-wrap">{references.map((ref) => ref.text).join('\n')}</p><button type="button" className="mt-1 underline" onClick={removeReferences}>移除引用</button></div>}
        <div className="consultation-composer rounded-2xl border bg-white p-3 focus-within:ring-2 focus-within:ring-black/5">
          {activeFocus && <DiscussionFocus label={activeFocus.label} onClear={() => setFocus(null)} />}
          <textarea ref={inputRef} aria-label={`向${label}提问`} value={text} disabled={busy} maxLength={6000} onChange={(e) => changeText(e.target.value)} placeholder={`想和${label}聊些什么？`} rows={2}
            onKeyDown={(e) => { if (e.key === 'Enter' && !e.shiftKey && !e.nativeEvent.isComposing) { e.preventDefault(); void send(); } }}
            className="min-h-[60px] w-full resize-none border-0 bg-transparent text-[13px] leading-6 outline-none placeholder:text-muted-foreground/65" />
          <div className="mt-2 flex items-center justify-between gap-2" data-testid="consultation-composer-actions">
            {discussionEnabled ? <button type="button" disabled={helpUnavailable} onClick={askForSuggestions} className="consultation-help-prompt flex min-h-9 cursor-pointer items-center gap-1.5 rounded-full px-3 text-xs transition-colors disabled:cursor-not-allowed disabled:opacity-50">帮我看看<ChevronRight className="h-3 w-3" aria-hidden="true" /></button>
              : <span />}
            {running ? <button type="button" className="rounded-lg border px-3 py-2 text-xs" onClick={() => void teacherApi.cancel(topicBase, topic!.id, running.id).then(consume).catch(() => setError('暂时无法停止，请稍后重试。'))}>停止回复</button>
            : <button type="submit" aria-label="提问" title={busy ? '正在发送…' : '发送'} disabled={busy || !topicEnabled || !text.trim()} className="consultation-send flex h-8 w-8 items-center justify-center rounded-full text-white disabled:opacity-30"><ArrowUp className="h-4 w-4" /></button>}
          </div>
        </div>
      </form>
    </aside>
  );
}