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* SessionQnaThread (Story 7.5 — "The Apéro Continues")
*
* Tailwind-only (NO MUI) per-session Q&A thread, mounted on the public session card both
* PRE-event (SPEAKERS_PUBLISHED trigger / manual organizer open) and post-event/archive.
* Anyone can read; logged-in users can post questions + one-level answers while the window is OPEN;
* organizers can take down posts. A FROZEN window is read-only (the permanent archive thread).
* Removed posts render as "removed by organizer" tombstones, preserving thread structure.
*
* The thread is COLLAPSED by default behind a compact "Ask a question" toggle — discoverable but
* unobtrusive when shown under many session cards (e.g. pre-event with empty threads).
*/
import { useState } from 'react';
import { ChevronDown } from 'lucide-react';
import { useTranslation } from 'react-i18next';
import { useAuth } from '@/hooks/useAuth/useAuth';
import { useSessionQna, useAddQnaPost, useRemoveQnaPost } from '@/hooks/useQna/useQna';
import type { QnaPostResponse } from '@/services/qnaService';
import { SpeakerDisplay } from '@/components/public/Event/SpeakerDisplay';
import type { SessionSpeaker } from '@/types/event.types';
/**
* Map a Q&A post's enriched poster fields onto the {@link SessionSpeaker} shape so the same
* name + company-logo component used on the public speaker cards renders the author. Name + company
* come from the server-side read enrichment, exactly as the speaker cards source them. Falls back
* to the username when the name is unknown.
*
* Q&A authors are usually attendees, and the public-user portrait endpoint is SPEAKER-scoped (it
* 404s for everyone else), so SpeakerDisplay is rendered with {@code lazyLoadPortrait={false}} —
* the author shows an initials avatar and no pointless 404 fires (feedback #16).
*/
function postToSpeaker(post: QnaPostResponse): SessionSpeaker {
const firstName = post.postedByFirstName?.trim() || post.postedByUsername || '';
return {
username: post.postedByUsername ?? '',
firstName,
lastName: post.postedByLastName ?? '',
company: post.postedByCompanyName ?? undefined,
companyDisplayName: post.postedByCompanyName ?? undefined,
companyLogoUrl: post.postedByCompanyLogoUrl ?? undefined,
// Required by SessionSpeaker but irrelevant for a Q&A poster (SpeakerDisplay ignores them).
speakerRole: 'PRIMARY_SPEAKER',
isConfirmed: true,
};
}
interface SessionQnaThreadProps {
eventCode: string;
sessionSlug: string;
}
export function SessionQnaThread({ eventCode, sessionSlug }: SessionQnaThreadProps) {
const { t } = useTranslation('events');
const { isAuthenticated, hasRole } = useAuth();
const isOrganizer = hasRole('organizer');
const { data: thread, isError } = useSessionQna(eventCode, sessionSlug, true);
const addPost = useAddQnaPost(eventCode, sessionSlug);
const removePost = useRemoveQnaPost(eventCode, sessionSlug);
const [expanded, setExpanded] = useState(false);
const [question, setQuestion] = useState('');
const [replyTo, setReplyTo] = useState<string | null>(null);
const [replyBody, setReplyBody] = useState('');
// No window for this session (event not completed, or unknown) → render nothing.
if (isError || !thread) {
return null;
}
const isOpen = thread.status === 'OPEN';
// Taken-down posts are removed from the thread entirely (the backend already drops them; this
// is a defensive client-side guard so a removed post never renders or inflates the count).
const posts = (thread.posts ?? []).filter((p) => !p.removed);
const questions = posts.filter((p) => !p.parentPostId);
const answersByParent = posts.reduce<Record<string, QnaPostResponse[]>>((acc, p) => {
Iif (p.parentPostId) {
(acc[p.parentPostId] ??= []).push(p);
}
return acc;
}, {});
function submitQuestion(e: React.FormEvent) {
e.preventDefault();
Iif (!question.trim()) return;
addPost.mutate({ body: question.trim() }, { onSuccess: () => setQuestion('') });
}
function submitReply(e: React.FormEvent, parentPostId: string) {
e.preventDefault();
if (!replyBody.trim()) return;
addPost.mutate(
{ body: replyBody.trim(), parentPostId },
{
onSuccess: () => {
setReplyBody('');
setReplyTo(null);
},
}
);
}
function renderPost(post: QnaPostResponse, isAnswer: boolean) {
return (
<div
key={post.id}
className={`rounded bg-zinc-800/40 p-3 ${isAnswer ? 'ml-6 mt-2' : ''}`}
data-testid="qna-post"
>
<SpeakerDisplay speaker={postToSpeaker(post)} size="small" lazyLoadPortrait={false} />
<p className="mt-2 whitespace-pre-wrap text-sm text-zinc-200">{post.body}</p>
{isOrganizer && (
<button
type="button"
onClick={() => removePost.mutate(post.id)}
className="mt-1 text-xs text-red-400 hover:text-red-300"
data-testid="qna-takedown"
>
{t('qna.takedown')}
</button>
)}
</div>
);
}
const questionCount = questions.length;
const panelId = `qna-panel-${sessionSlug}`;
return (
<div className="pt-2 border-t border-zinc-800" data-testid="qna-thread">
<button
type="button"
onClick={() => setExpanded((v) => !v)}
aria-expanded={expanded}
aria-controls={panelId}
data-testid="qna-toggle"
className="flex w-full items-center gap-2 rounded py-1 text-left transition-colors hover:text-zinc-100"
>
<span className="text-sm text-zinc-300">💬 {t('qna.title')}</span>
<span
className={`rounded px-1.5 py-0.5 text-[10px] uppercase ${
isOpen ? 'bg-green-900/50 text-green-300' : 'bg-zinc-700 text-zinc-400'
}`}
data-testid="qna-status"
>
{isOpen ? t('qna.statusOpen') : t('qna.statusFrozen')}
</span>
{questionCount > 0 && (
<span
className="rounded-full bg-zinc-700 px-1.5 py-0.5 text-[10px] text-zinc-300"
data-testid="qna-count"
>
{questionCount}
</span>
)}
<span className="ml-auto flex items-center gap-1 text-xs text-blue-400">
{!expanded && (isOpen ? t('qna.askQuestion') : t('qna.viewThread'))}
<ChevronDown
className={`h-4 w-4 transition-transform ${expanded ? 'rotate-180' : ''}`}
aria-hidden="true"
/>
</span>
</button>
{expanded && (
<div id={panelId} className="mt-3" data-testid="qna-panel">
{questions.length === 0 && (
<p className="mb-3 text-sm text-zinc-500" data-testid="qna-empty">
{t('qna.empty')}
</p>
)}
<div className="space-y-3">
{questions.map((q) => (
<div key={q.id}>
{renderPost(q, false)}
{(answersByParent[q.id] ?? []).map((a) => renderPost(a, true))}
{isOpen && isAuthenticated && (
<div className="ml-6 mt-2">
{replyTo === q.id ? (
<form onSubmit={(e) => submitReply(e, q.id)} className="flex flex-col gap-2">
<textarea
value={replyBody}
onChange={(e) => setReplyBody(e.target.value)}
maxLength={5000}
rows={2}
placeholder={t('qna.replyPlaceholder')}
aria-label={t('qna.replyPlaceholder')}
className="w-full resize-none rounded-md border border-zinc-700 bg-zinc-900 px-3 py-2 text-sm text-zinc-200"
data-testid="qna-reply-input"
/>
<div className="flex gap-2">
<button
type="submit"
disabled={addPost.isPending}
className="rounded bg-blue-600 px-3 py-1 text-xs text-white hover:bg-blue-500 disabled:opacity-50"
data-testid="qna-reply-submit"
>
{t('qna.reply')}
</button>
<button
type="button"
onClick={() => setReplyTo(null)}
className="text-xs text-zinc-400 hover:text-zinc-300"
>
{t('qna.cancel')}
</button>
</div>
</form>
) : (
<button
type="button"
onClick={() => {
setReplyTo(q.id);
setReplyBody('');
}}
className="text-xs text-blue-400 hover:text-blue-300"
data-testid="qna-reply-button"
>
{t('qna.reply')}
</button>
)}
</div>
)}
</div>
))}
</div>
{isOpen && isAuthenticated && (
<form
onSubmit={submitQuestion}
className="mt-4 flex flex-col gap-2"
data-testid="qna-question-form"
>
<textarea
value={question}
onChange={(e) => setQuestion(e.target.value)}
maxLength={5000}
rows={2}
placeholder={t('qna.questionPlaceholder')}
aria-label={t('qna.questionPlaceholder')}
className="w-full resize-none rounded-md border border-zinc-700 bg-zinc-900 px-3 py-2 text-sm text-zinc-200"
data-testid="qna-question-input"
/>
<button
type="submit"
disabled={addPost.isPending}
className="self-start rounded bg-blue-600 px-3 py-1.5 text-sm text-white hover:bg-blue-500 disabled:opacity-50"
data-testid="qna-question-submit"
>
{t('qna.askQuestion')}
</button>
</form>
)}
{isOpen && !isAuthenticated && (
<p className="mt-3 text-xs text-zinc-500" data-testid="qna-login-hint">
{t('qna.loginToPost')}
</p>
)}
</div>
)}
</div>
);
}
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