import { useEffect, useId, useLayoutEffect, useRef, useState, type ChangeEvent, type CSSProperties, type FormEvent, type KeyboardEvent, type ReactNode } from 'react';
import {
Avatar,
AvatarFallback,
AvatarStack,
AvatarStackItem,
Badge,
Button,
Code,
Drawer,
DrawerClose,
DrawerContent,
DrawerTrigger,
Heading,
Icon,
IconButton,
Link,
Listbox,
ListboxGroup,
ListboxOption,
Text,
TextArea,
TextField,
TextFieldInput,
VisuallyHidden,
} from '@vega-ui/react';
import { ArrowDown, ArrowLeft, Check, CheckCheck, FileText, Hash, Heart, PanelRight, Paperclip, SearchIcon, SendHorizontal, ThumbsUp, XIcon } from '@vega-ui/icons';
import './chat.css';
type Presence = 'online' | 'away' | 'offline';
type ReactionName = 'thumbs-up' | 'heart' | 'check';
interface Person {
name: string
initials: string
role: string
presence: Presence
}
interface Reaction {
name: ReactionName
count: number
mine: boolean
}
interface Attachment {
name: string
size: string
image?: { src: string, alt: string }
}
interface Message {
id: string
author: string
day: string
time: string
text: string
replyTo?: string
reactions?: Reaction[]
attachment?: Attachment
status?: 'sent' | 'read'
}
interface Conversation {
id: string
kind: 'channel' | 'direct'
title: string
topic: string
members: string[]
}
const ME = 'elena';
const TOKEN = /(`[^`]+`|https:\/\/\S+)/;
const people: Record<string, Person> = {
elena: { name: 'Elena Moreau', initials: 'EM', role: 'Product designer', presence: 'online' },
alex: { name: 'Alex Kim', initials: 'AK', role: 'Frontend engineer', presence: 'online' },
priya: { name: 'Priya Nair', initials: 'PN', role: 'Design lead', presence: 'online' },
jonas: { name: 'Jonas Weber', initials: 'JW', role: 'Product manager', presence: 'away' },
sofia: { name: 'Sofia Lindqvist', initials: 'SL', role: 'Researcher', presence: 'offline' },
marco: { name: 'Marco Rossi', initials: 'MR', role: 'Release manager', presence: 'online' },
};
const presenceLabels: Record<Presence, string> = { online: 'Active now', away: 'Away', offline: 'Offline' };
const presenceColors: Record<Presence, string> = {
online: 'var(--color-green-accent-500)',
away: 'var(--color-amber-accent-500)',
offline: 'var(--label-tertiary)',
};
const reactionKinds: Record<ReactionName, { label: string, icon: ReactNode }> = {
'thumbs-up': { label: 'Thumbs up', icon: <ThumbsUp /> },
'heart': { label: 'Heart', icon: <Heart /> },
'check': { label: 'Done', icon: <Check /> },
};
const conversations: Conversation[] = [
{ id: 'design', kind: 'channel', title: 'design', topic: 'Checkout redesign and weekly design reviews', members: ['elena', 'priya', 'alex', 'jonas', 'sofia', 'marco'] },
{ id: 'releases', kind: 'channel', title: 'releases', topic: 'Release trains, staging and rollouts', members: ['elena', 'marco', 'jonas', 'alex'] },
{ id: 'general', kind: 'channel', title: 'general', topic: 'Company-wide announcements', members: ['elena', 'priya', 'alex', 'jonas', 'sofia', 'marco'] },
{ id: 'alex', kind: 'direct', title: 'Alex Kim', topic: 'Frontend engineer', members: ['alex', 'elena'] },
{ id: 'priya', kind: 'direct', title: 'Priya Nair', topic: 'Design lead', members: ['priya', 'elena'] },
{ id: 'jonas', kind: 'direct', title: 'Jonas Weber', topic: 'Product manager', members: ['jonas', 'elena'] },
];
const checkoutMockup = `data:image/svg+xml,${encodeURIComponent('<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 200"><rect width="320" height="200" fill="hsl(222 32% 95%)"/><rect x="20" y="20" width="176" height="160" rx="10" fill="hsl(0 0% 100%)"/><rect x="36" y="38" width="88" height="10" rx="5" fill="hsl(222 20% 72%)"/><rect x="36" y="62" width="144" height="22" rx="6" fill="hsl(222 30% 92%)"/><rect x="36" y="94" width="144" height="22" rx="6" fill="hsl(222 30% 92%)"/><rect x="36" y="126" width="68" height="22" rx="6" fill="hsl(222 30% 92%)"/><rect x="112" y="126" width="68" height="22" rx="6" fill="hsl(222 30% 92%)"/><rect x="208" y="20" width="92" height="118" rx="10" fill="hsl(0 0% 100%)"/><rect x="220" y="36" width="52" height="8" rx="4" fill="hsl(222 20% 72%)"/><rect x="220" y="56" width="68" height="6" rx="3" fill="hsl(222 30% 88%)"/><rect x="220" y="70" width="60" height="6" rx="3" fill="hsl(222 30% 88%)"/><rect x="220" y="84" width="64" height="6" rx="3" fill="hsl(222 30% 88%)"/><rect x="220" y="110" width="68" height="16" rx="8" fill="hsl(222 85% 58%)"/></svg>')}`;
const initialMessages: Record<string, Message[]> = {
design: [
{ id: 'd1', author: 'priya', day: 'Yesterday', time: '4:12 PM', text: 'Uploaded the checkout v3 explorations. The order summary now sticks while you scroll.', attachment: { name: 'checkout-v3.png', size: '1.4 MB', image: { src: checkoutMockup, alt: 'Checkout v3 mockup with a form and a sticky order summary' } } },
{ id: 'd2', author: 'priya', day: 'Yesterday', time: '4:13 PM', text: 'Feedback welcome before Thursday’s review.' },
{ id: 'd3', author: 'alex', day: 'Yesterday', time: '5:02 PM', text: 'Love the sticky summary. Can we keep the promo code field collapsed by default?', reactions: [{ name: 'thumbs-up', count: 2, mine: false }] },
{ id: 'd4', author: 'jonas', day: 'Today', time: '9:14 AM', text: 'Spec is up to date: https://northwind.example/specs/checkout-v3' },
{ id: 'd5', author: 'elena', day: 'Today', time: '9:20 AM', text: 'Collapsed works for me too.', replyTo: 'd3' },
{ id: 'd6', author: 'elena', day: 'Today', time: '9:21 AM', text: 'I’ll wire the totals to `useCartSummary()` today.', status: 'read', reactions: [{ name: 'heart', count: 1, mine: false }] },
{ id: 'd7', author: 'alex', day: 'Today', time: '9:34 AM', text: 'Nice. One thing: the tax row jumps when the country changes. Let’s reserve its height.', reactions: [{ name: 'check', count: 3, mine: true }] },
{ id: 'd8', author: 'alex', day: 'Today', time: '9:35 AM', text: 'Happy to pair on it after standup.' },
],
releases: [
{ id: 'r1', author: 'marco', day: 'Yesterday', time: '6:40 PM', text: 'Release notes for 2.8 are ready for review.', attachment: { name: 'release-notes-2.8.pdf', size: '220 KB' } },
{ id: 'r2', author: 'marco', day: 'Today', time: '8:05 AM', text: '2.8.0 is on staging: https://staging.northwind.example' },
{ id: 'r3', author: 'jonas', day: 'Today', time: '8:31 AM', text: 'Smoke tests are green on Chrome and Safari.' },
{ id: 'r4', author: 'marco', day: 'Today', time: '9:02 AM', text: 'Firefox run is still going: `pnpm test:e2e --project=firefox`' },
{ id: 'r5', author: 'marco', day: 'Today', time: '9:48 AM', text: 'Firefox passed. Promoting to production at 2 PM.' },
],
general: [
{ id: 'g1', author: 'sofia', day: 'Yesterday', time: '11:20 AM', text: 'Usability sessions for checkout are booked for next Tuesday. Notes will land in #design.' },
{ id: 'g2', author: 'marco', day: 'Today', time: '8:50 AM', text: 'The office is closed on Friday for the move. Please pack your desks by Thursday evening.' },
],
alex: [
{ id: 'a1', author: 'alex', day: 'Yesterday', time: '3:02 PM', text: 'Got a minute to look at the totals bug?' },
{ id: 'a2', author: 'elena', day: 'Yesterday', time: '3:10 PM', text: 'Sure, after lunch.', status: 'read' },
{ id: 'a3', author: 'alex', day: 'Today', time: '9:40 AM', text: 'Pushed a fix to `fix/tax-row-height`. Could you check it on mobile?' },
],
priya: [
{ id: 'p1', author: 'priya', day: 'Today', time: '9:52 AM', text: 'Can you share the file with the new empty states?' },
{ id: 'p2', author: 'priya', day: 'Today', time: '9:53 AM', text: 'No rush, tomorrow is fine.' },
],
jonas: [
{ id: 'j1', author: 'elena', day: 'Yesterday', time: '1:15 PM', text: 'Do we still need the legacy coupon endpoint?' },
{ id: 'j2', author: 'jonas', day: 'Yesterday', time: '1:40 PM', text: 'Only for the mobile app until 4.2 ships.' },
],
};
const initialUnread: Record<string, number> = { design: 0, releases: 4, general: 1, alex: 1, priya: 2, jonas: 0 };
const replies = [
'Sounds good, thanks!',
'On it. I’ll post an update here when it’s done.',
'Makes sense, let’s go with that.',
];
const clock = new Intl.DateTimeFormat('en-US', { hour: 'numeric', minute: '2-digit' });
const closeButton = { flexShrink: 0, '--icon-button-size': '24px', '--icon-button-br-ratio': 0.5 } as CSSProperties;
const ghost = { variant: 'secondary', appearance: 'ghost' } as const;
const truncate = { minWidth: 0, overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' } as const;
const renderText = (text: string) => text.split(TOKEN).map((part, index) => {
if (part.startsWith('`') && part.endsWith('`') && part.length > 2) return <Code key={index} size={2}>{part.slice(1, -1)}</Code>;
if (part.startsWith('https://')) return <Link key={index} href={part} target='_blank' rel='noreferrer'>{part.slice(8)}</Link>;
return part;
});
const getPreview = (message: Message | undefined) => {
if (!message) return 'No messages yet';
const text = message.text === '' && message.attachment ? message.attachment.name : message.text.replaceAll('`', '');
if (message.author === ME) return `You: ${text}`;
return text;
};
const firstName = (person: string) => people[person].name.split(' ')[0];
const PersonAvatar = ({ person, size = 'md' }: { person: string, size?: 'sm' | 'md' }) => (
<span style={{ position: 'relative', display: 'inline-flex', flexShrink: 0 }}>
<Avatar size={size} aria-hidden='true'>
<AvatarFallback>{people[person].initials}</AvatarFallback>
</Avatar>
<span
className='chat-presence'
style={{
position: 'absolute',
insetBlockEnd: 0,
insetInlineEnd: 0,
inlineSize: 'var(--spacing-5)',
blockSize: 'var(--spacing-5)',
borderRadius: '50%',
background: presenceColors[people[person].presence],
}}
/>
</span>
);
const AttachmentCard = ({ attachment }: { attachment: Attachment }) => {
if (attachment.image) {
return (
<figure style={{ margin: 0, inlineSize: 'min(100%, 320px)', overflow: 'hidden', border: '1px solid var(--separator-opaque)', borderRadius: 'var(--radius-3)', background: 'var(--surface-primary)' }}>
<img src={attachment.image.src} alt={attachment.image.alt} style={{ display: 'block', inlineSize: '100%', aspectRatio: '8 / 5', objectFit: 'cover' }} />
<figcaption style={{ display: 'flex', justifyContent: 'space-between', gap: 'var(--spacing-6)', padding: 'var(--spacing-4) var(--spacing-6)' }}>
<Text size={2} fontWeight={500} style={truncate}>{attachment.name}</Text>
<Text size={2} className='chat-muted' style={{ flexShrink: 0, fontVariantNumeric: 'tabular-nums' }}>{attachment.size}</Text>
</figcaption>
</figure>
);
}
return (
<div style={{ display: 'flex', alignItems: 'center', gap: 'var(--spacing-6)', inlineSize: 'min(100%, 320px)', padding: 'var(--spacing-5) var(--spacing-6)', border: '1px solid var(--separator-opaque)', borderRadius: 'var(--radius-3)', background: 'var(--surface-primary)', boxSizing: 'border-box' }}>
<Icon size='sm' aria-hidden='true' style={{ flexShrink: 0, color: 'var(--color-primary-500)' }}><FileText /></Icon>
<div style={{ display: 'grid', minWidth: 0 }}>
<Text size={2} fontWeight={500} style={truncate}>{attachment.name}</Text>
<Text size={1} className='chat-muted' style={{ fontVariantNumeric: 'tabular-nums' }}>{attachment.size}</Text>
</div>
</div>
);
};
interface MessageItemProps {
message: Message
first: boolean
receipt: boolean
fresh: boolean
quoted?: Message
onToggleReaction(name: ReactionName): void
}
const MessageItem = ({ message, first, receipt, fresh, quoted, onToggleReaction }: MessageItemProps) => {
const own = message.author === ME;
const author = own ? 'You' : people[message.author].name;
const tail = own ? 'borderStartEndRadius' : 'borderStartStartRadius';
const time = (
<time dir='auto' className={first && !own ? undefined : 'chat-time'} style={{ flexShrink: 0, fontSize: 'var(--font-size-1)', color: 'var(--label-tertiary)', fontVariantNumeric: 'tabular-nums', whiteSpace: 'nowrap' }}>
{message.time}
</time>
);
return (
<li
className={fresh ? 'chat-message chat-enter' : 'chat-message'}
style={{
display: 'grid',
gridTemplateColumns: own ? 'minmax(0, 1fr)' : 'var(--spacing-16) minmax(0, 1fr)',
columnGap: 'var(--spacing-5)',
marginBlockStart: first ? 'var(--spacing-8)' : 'var(--spacing-1)',
}}
>
{!own && <div>{first && <PersonAvatar person={message.author} />}</div>}
<div style={{ display: 'grid', justifyItems: own ? 'end' : 'start', gap: 'var(--spacing-2)', minWidth: 0 }}>
{first && !own && (
<div style={{ display: 'flex', alignItems: 'baseline', gap: 'var(--spacing-4)', minWidth: 0 }}>
<Text size={2} fontWeight={600} style={truncate}>{author}</Text>
{time}
</div>
)}
{(!first || own) && <VisuallyHidden asChild><span>{author}</span></VisuallyHidden>}
<div style={{ display: 'flex', flexDirection: own ? 'row-reverse' : 'row', alignItems: 'flex-end', gap: 'var(--spacing-4)', maxInlineSize: '100%' }}>
<div
style={{
display: 'grid',
gap: 'var(--spacing-4)',
minWidth: 0,
maxInlineSize: 'min(100%, 520px)',
padding: 'var(--spacing-5) var(--spacing-7)',
borderRadius: 'var(--radius-4)',
[tail]: first ? 'var(--radius-4)' : 'var(--radius-1)',
background: own ? 'oklch(from var(--color-primary-500) l c h / 0.14)' : 'var(--fills-secondary)',
}}
>
{quoted && (
<blockquote style={{ display: 'grid', margin: 0, paddingBlock: 'var(--spacing-1)', paddingInline: 'var(--spacing-5) 0', borderInlineStart: '2px solid var(--color-primary-500)' }}>
<Text size={1} fontWeight={600} style={{ color: 'var(--color-primary-500)' }}>{quoted.author === ME ? 'You' : people[quoted.author].name}</Text>
<Text dir='auto' size={2} className='chat-muted' style={truncate}>{quoted.text.replaceAll('`', '')}</Text>
</blockquote>
)}
{message.text !== '' && <Text dir='auto' size={3} style={{ whiteSpace: 'pre-wrap', overflowWrap: 'anywhere' }}>{renderText(message.text)}</Text>}
{message.attachment && <AttachmentCard attachment={message.attachment} />}
</div>
{(!first || own) && time}
</div>
{message.reactions && message.reactions.length > 0 && (
<div style={{ display: 'flex', flexWrap: 'wrap', gap: 'var(--spacing-2)' }}>
{message.reactions.map((reaction) => (
<Button
key={reaction.name}
type='button'
size='xs'
{...ghost}
className='chat-reaction'
aria-pressed={reaction.mine}
aria-label={`${reactionKinds[reaction.name].label}, ${reaction.count}`}
onClick={() => onToggleReaction(reaction.name)}
style={{ gap: 'var(--spacing-2)', '--button-br-ratio': 0.5 } as CSSProperties}
>
<Icon size='xs' aria-hidden='true'>{reactionKinds[reaction.name].icon}</Icon>
<span style={{ fontVariantNumeric: 'tabular-nums' }}>{reaction.count}</span>
</Button>
))}
</div>
)}
{receipt && message.status && (
<Text size={1} style={{ display: 'inline-flex', alignItems: 'center', gap: 'var(--spacing-1)', color: 'var(--label-tertiary)' }}>
<Icon size='xs' aria-hidden='true'>{message.status === 'read' ? <CheckCheck /> : <Check />}</Icon>
{message.status === 'read' ? 'Read' : 'Sent'}
</Text>
)}
</div>
</li>
);
};
export default function Chat() {
const id = useId();
const [activeId, setActiveId] = useState('design');
const [view, setView] = useState<'list' | 'conversation'>('list');
const [query, setQuery] = useState('');
const [messages, setMessages] = useState(initialMessages);
const [unread, setUnread] = useState(initialUnread);
const [drafts, setDrafts] = useState<Record<string, string>>({});
const [typing, setTyping] = useState<{ conversation: string, person: string } | null>(null);
const [fresh, setFresh] = useState<string[]>([]);
const [atBottom, setAtBottom] = useState(true);
const [announcement, setAnnouncement] = useState('');
const listRef = useRef<HTMLDivElement>(null);
const sidebarRef = useRef<HTMLDivElement>(null);
const paneRef = useRef<HTMLDivElement>(null);
const titleRef = useRef<HTMLHeadingElement>(null);
const scrollerRef = useRef<HTMLDivElement>(null);
const composerRef = useRef<HTMLTextAreaElement>(null);
const fileRef = useRef<HTMLInputElement>(null);
const positions = useRef<Record<string, number>>({});
const activeRef = useRef(activeId);
const pendingScroll = useRef(false);
const pendingFocus = useRef<'title' | 'list' | null>(null);
const timers = useRef<number[]>([]);
const replyIndex = useRef(0);
const nextId = useRef(0);
const conversation = conversations.find((item) => item.id === activeId) ?? conversations[0];
const thread = messages[activeId];
const draft = drafts[activeId] ?? '';
const lastOwn = thread.findLast((message) => message.author === ME);
const days = [...new Set(thread.map((message) => message.day))];
const files = thread.flatMap((message) => message.attachment ? [message.attachment] : []);
const visible = conversations.filter((item) => item.title.toLowerCase().includes(query.trim().toLowerCase()));
const lines = draft.split('\n').length;
const title = conversation.kind === 'channel' ? `#${conversation.title}` : conversation.title;
const isOnScreen = (conversationId: string) => activeRef.current === conversationId && paneRef.current?.offsetParent !== null;
const jumpToLatest = () => {
const scroller = scrollerRef.current;
if (!scroller) return;
const reduced = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
scroller.scrollTo({ top: scroller.scrollHeight, behavior: reduced ? 'auto' : 'smooth' });
composerRef.current?.focus();
};
useEffect(() => {
activeRef.current = activeId;
}, [activeId]);
useEffect(() => {
const pending = timers.current;
return () => pending.forEach((timer) => window.clearTimeout(timer));
}, []);
useLayoutEffect(() => {
const scroller = scrollerRef.current;
if (!scroller) return;
scroller.scrollTop = positions.current[activeId] ?? scroller.scrollHeight;
setAtBottom(scroller.scrollHeight - scroller.scrollTop - scroller.clientHeight < 48);
}, [activeId, view]);
useEffect(() => {
const scroller = scrollerRef.current;
if (!pendingScroll.current || !scroller) return;
const reduced = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
pendingScroll.current = false;
scroller.scrollTo({ top: scroller.scrollHeight, behavior: reduced ? 'auto' : 'smooth' });
}, [thread.length]);
useEffect(() => {
if (pendingFocus.current === 'title' && sidebarRef.current?.offsetParent === null) titleRef.current?.focus();
if (pendingFocus.current === 'list') listRef.current?.focus();
pendingFocus.current = null;
}, [view, activeId]);
const openConversation = (value: string | undefined) => {
if (value === undefined) return;
setActiveId(value);
setView('conversation');
setFresh([]);
setUnread((current) => ({ ...current, [value]: 0 }));
pendingFocus.current = 'title';
};
const goBack = () => {
setView('list');
pendingFocus.current = 'list';
};
const onScroll = () => {
const scroller = scrollerRef.current;
if (!scroller) return;
positions.current[activeId] = scroller.scrollTop;
setAtBottom(scroller.scrollHeight - scroller.scrollTop - scroller.clientHeight < 48);
};
const later = (callback: () => void, delay: number) => {
timers.current.push(window.setTimeout(callback, delay));
};
const receiveReply = (conversationId: string) => {
const responder = conversations.find((item) => item.id === conversationId)?.kind === 'direct' ? conversationId : 'alex';
const text = replies[replyIndex.current % replies.length];
replyIndex.current += 1;
later(() => {
setTyping({ conversation: conversationId, person: responder });
setMessages((current) => ({
...current,
[conversationId]: current[conversationId].map((message) => message.status === 'sent' ? { ...message, status: 'read' } : message),
}));
}, 900);
later(() => {
const reply: Message = { id: `m${nextId.current++}`, author: responder, day: 'Today', time: clock.format(new Date()), text };
const onScreen = isOnScreen(conversationId);
const scroller = scrollerRef.current;
const nearBottom = scroller ? scroller.scrollHeight - scroller.scrollTop - scroller.clientHeight < 48 : false;
setTyping(null);
setMessages((current) => ({ ...current, [conversationId]: [...current[conversationId], reply] }));
if (onScreen) {
setFresh((current) => [...current, reply.id]);
pendingScroll.current = nearBottom;
setAnnouncement(`${people[responder].name}: ${text}`);
return;
}
setUnread((current) => ({ ...current, [conversationId]: current[conversationId] + 1 }));
const where = conversationId === responder ? '' : ` in #${conversationId}`;
setAnnouncement(`New message from ${people[responder].name}${where}`);
}, 3000);
};
const send = (text: string, attachment?: Attachment) => {
const message: Message = { id: `m${nextId.current++}`, author: ME, day: 'Today', time: clock.format(new Date()), text, attachment, status: 'sent' };
setMessages((current) => ({ ...current, [activeId]: [...current[activeId], message] }));
setFresh((current) => [...current, message.id]);
setAnnouncement('Message sent');
pendingScroll.current = true;
receiveReply(activeId);
};
const submit = (event?: FormEvent<HTMLFormElement>) => {
event?.preventDefault();
const text = draft.trim();
if (text === '') return;
setDrafts((current) => ({ ...current, [activeId]: '' }));
send(text);
};
const changeDraft = (event: ChangeEvent<HTMLTextAreaElement>) => {
const value = event.currentTarget.value;
setDrafts((current) => ({ ...current, [activeId]: value }));
};
const onComposerKeyDown = (event: KeyboardEvent<HTMLTextAreaElement>) => {
if (event.key !== 'Enter' || event.shiftKey || event.nativeEvent.isComposing) return;
event.preventDefault();
submit();
};
const attach = (event: ChangeEvent<HTMLInputElement>) => {
const file = event.currentTarget.files?.[0];
event.currentTarget.value = '';
if (!file) return;
send('', { name: file.name, size: `${Math.max(1, Math.round(file.size / 1024))} KB` });
};
const toggleReaction = (messageId: string, name: ReactionName) => {
setMessages((current) => ({
...current,
[activeId]: current[activeId].map((message) => {
if (message.id !== messageId || !message.reactions) return message;
const reactions = message.reactions
.map((reaction) => reaction.name === name ? { ...reaction, mine: !reaction.mine, count: reaction.count + (reaction.mine ? -1 : 1) } : reaction)
.filter((reaction) => reaction.count > 0);
return { ...message, reactions };
}),
}));
};
const renderOption = (item: Conversation) => {
const last = messages[item.id].at(-1);
const count = unread[item.id];
return (
<ListboxOption
key={item.id}
value={item.id}
label={item.title}
className='chat-conversation'
style={{ height: 'auto', paddingBlock: 'var(--spacing-5)', paddingInline: 'var(--spacing-6)', gap: 'var(--spacing-6)' }}
>
{item.kind === 'channel'
? (
<span className='chat-channel-icon' style={{ display: 'inline-flex', alignItems: 'center', justifyContent: 'center', flexShrink: 0, inlineSize: 'var(--spacing-16)', blockSize: 'var(--spacing-16)', borderRadius: 'var(--radius-2)' }}>
<Icon size='sm' aria-hidden='true'><Hash /></Icon>
</span>
)
: <PersonAvatar person={item.id} />}
<span style={{ display: 'grid', gridTemplateColumns: 'minmax(0, 1fr)', flex: 1, minWidth: 0 }}>
<span style={{ display: 'flex', alignItems: 'baseline', justifyContent: 'space-between', gap: 'var(--spacing-4)' }}>
<span style={{ ...truncate, fontWeight: count > 0 ? 600 : 500 }}>
{item.title}
{item.kind === 'direct' && <VisuallyHidden asChild><span>{`, ${presenceLabels[people[item.id].presence]}`}</span></VisuallyHidden>}
</span>
<span className='chat-muted' style={{ flexShrink: 0, fontSize: 'var(--font-size-1)', fontVariantNumeric: 'tabular-nums' }}>
<bdi>{last?.day === 'Today' ? last.time : last?.day}</bdi>
</span>
</span>
<span style={{ display: 'flex', alignItems: 'center', gap: 'var(--spacing-4)' }}>
<span dir='auto' className='chat-muted' style={{ ...truncate, flex: 1, fontSize: 'var(--font-size-2)' }}>{getPreview(last)}</span>
{count > 0 && (
<Badge size='xs' variant='info' appearance='fill' style={{ flexShrink: 0, fontVariantNumeric: 'tabular-nums' }}>
{count}
<VisuallyHidden asChild><span> unread</span></VisuallyHidden>
</Badge>
)}
</span>
</span>
</ListboxOption>
);
};
const channels = visible.filter((item) => item.kind === 'channel');
const directs = visible.filter((item) => item.kind === 'direct');
return (
<div
className='chat-root'
style={{
width: '100%',
maxWidth: 1080,
blockSize: 640,
marginInline: 'auto',
overflow: 'clip',
border: '1px solid var(--separator-opaque)',
borderRadius: 'var(--radius-5)',
background: 'var(--surface-primary)',
boxSizing: 'border-box',
}}
>
<div className='chat-layout' data-view={view}>
<div ref={sidebarRef} className='chat-sidebar'>
<div style={{ display: 'grid', gap: 'var(--spacing-6)', padding: 'var(--spacing-8) var(--spacing-8) var(--spacing-4)' }}>
<Heading as='h2' size={5} fontWeight={700}>Messages</Heading>
<TextField size='sm'>
<Icon size='sm' aria-hidden='true' style={{ flexShrink: 0, marginInlineStart: 'var(--spacing-5)', color: 'var(--label-secondary)' }}>
<SearchIcon />
</Icon>
<TextFieldInput
type='search'
className='chat-search'
aria-label='Search conversations'
placeholder='Search'
value={query}
onChange={(event) => setQuery(event.currentTarget.value)}
/>
</TextField>
</div>
{visible.length === 0 && (
<Text size={2} className='chat-muted' style={{ padding: 'var(--spacing-8)', overflowWrap: 'anywhere' }}>{`No conversations match “${query.trim()}”.`}</Text>
)}
{visible.length > 0 && (
<Listbox
ref={listRef}
aria-label='Conversations'
value={activeId}
onChangeValue={openConversation}
style={{ flex: 1, minHeight: 0, gap: 'var(--spacing-1)', padding: 'var(--spacing-2) var(--spacing-4) var(--spacing-6)', borderRadius: 0, background: 'transparent', outlineOffset: -2 }}
>
{[{ name: 'Channels', items: channels }, { name: 'Direct messages', items: directs }].filter((group) => group.items.length > 0).map((group) => (
<ListboxGroup key={group.name} aria-labelledby={`${id}-${group.name}`} style={{ gap: 'var(--spacing-1)' }}>
<Text
id={`${id}-${group.name}`}
size={1}
fontWeight={600}
className='chat-muted'
style={{ paddingInline: 'var(--spacing-6)', paddingBlock: 'var(--spacing-6) var(--spacing-2)', textTransform: 'uppercase', letterSpacing: '0.04em' }}
>
{group.name}
</Text>
{group.items.map(renderOption)}
</ListboxGroup>
))}
</Listbox>
)}
</div>
<section ref={paneRef} className='chat-pane' aria-labelledby={`${id}-title`}>
<header style={{ display: 'flex', alignItems: 'center', gap: 'var(--spacing-6)', minHeight: 'var(--spacing-32)', paddingBlock: 'var(--spacing-6)', paddingInline: 'var(--spacing-6) var(--spacing-8)', borderBlockEnd: '1px solid var(--separator-opaque)', boxSizing: 'border-box' }}>
<IconButton size='xs' type='button' className='chat-back' aria-label='Back to conversations' {...ghost} onClick={goBack} style={{ flexShrink: 0 }}>
<Icon size='sm' className='chat-mirror'><ArrowLeft /></Icon>
</IconButton>
{conversation.kind === 'direct' && <PersonAvatar person={conversation.id} />}
<div style={{ display: 'grid', flex: 1, minWidth: 0, paddingInlineStart: 'var(--spacing-2)' }}>
<Heading ref={titleRef} id={`${id}-title`} as='h2' size={4} fontWeight={600} tabIndex={-1} style={{ ...truncate, outline: 'none' }}><bdi>{title}</bdi></Heading>
<Text size={2} className='chat-muted' style={truncate}>
<bdi>{conversation.kind === 'direct' ? presenceLabels[people[conversation.id].presence] : conversation.topic}</bdi>
</Text>
</div>
{conversation.kind === 'channel' && (
<AvatarStack size='sm' className='chat-members' role='group' aria-label={`${conversation.members.length} members`} style={{ flexShrink: 0 }}>
{conversation.members.slice(0, 3).map((member) => (
<AvatarStackItem key={member} role='img' aria-label={people[member].name} title={people[member].name}>
<AvatarFallback>{people[member].initials}</AvatarFallback>
</AvatarStackItem>
))}
{conversation.members.length > 3 && (
<AvatarStackItem variant='secondary' role='img' dir='ltr' aria-label={`and ${conversation.members.length - 3} more`}>
<AvatarFallback>{`+${conversation.members.length - 3}`}</AvatarFallback>
</AvatarStackItem>
)}
</AvatarStack>
)}
<Drawer>
<DrawerTrigger asChild>
<IconButton size='xs' type='button' aria-label='Conversation details' {...ghost} style={{ flexShrink: 0 }}>
<Icon size='sm' className='chat-mirror'><PanelRight /></Icon>
</IconButton>
</DrawerTrigger>
<DrawerContent fullHeight aria-labelledby={`${id}-details`} style={{ width: 'min(360px, 100vw)', boxSizing: 'border-box' }}>
<div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', gap: 'var(--spacing-8)' }}>
<Heading id={`${id}-details`} as='h2' size={4} fontWeight={600} style={truncate}><bdi>{title}</bdi></Heading>
<DrawerClose asChild>
<IconButton size='xs' aria-label='Close' {...ghost} style={closeButton}>
<Icon size='xs'><XIcon strokeWidth={2.5} /></Icon>
</IconButton>
</DrawerClose>
</div>
<Text size={2} className='chat-muted' style={{ display: 'block', marginBlockStart: 'var(--spacing-2)' }}>{conversation.topic}</Text>
<div style={{ display: 'grid', alignContent: 'start', gap: 'var(--spacing-12)', flex: 1, minHeight: 0, overflow: 'auto', marginBlockStart: 'var(--spacing-12)' }}>
<section aria-labelledby={`${id}-members`} style={{ display: 'grid', gap: 'var(--spacing-6)' }}>
<Heading id={`${id}-members`} as='h3' size={2} fontWeight={600}>{`Members · ${conversation.members.length}`}</Heading>
<ul style={{ display: 'grid', gap: 'var(--spacing-6)', margin: 0, padding: 0, listStyle: 'none' }}>
{conversation.members.map((member) => (
<li key={member} style={{ display: 'flex', alignItems: 'center', gap: 'var(--spacing-6)', minWidth: 0 }}>
<PersonAvatar person={member} />
<div style={{ display: 'grid', minWidth: 0 }}>
<Text size={3} fontWeight={500} style={truncate}>{member === ME ? `${people[member].name} (you)` : people[member].name}</Text>
<Text size={2} className='chat-muted' style={truncate}>{`${people[member].role} · ${presenceLabels[people[member].presence]}`}</Text>
</div>
</li>
))}
</ul>
</section>
<section aria-labelledby={`${id}-files`} style={{ display: 'grid', gap: 'var(--spacing-6)', alignContent: 'start' }}>
<Heading id={`${id}-files`} as='h3' size={2} fontWeight={600}>Shared files</Heading>
{files.length === 0 && <Text size={2} className='chat-muted'>No files shared yet.</Text>}
{files.length > 0 && (
<ul style={{ display: 'grid', gap: 'var(--spacing-4)', margin: 0, padding: 0, listStyle: 'none' }}>
{files.map((file) => (
<li key={file.name} style={{ display: 'flex', alignItems: 'center', gap: 'var(--spacing-6)', minWidth: 0 }}>
<Icon size='sm' aria-hidden='true' style={{ flexShrink: 0, color: 'var(--color-primary-500)' }}><FileText /></Icon>
<Text size={3} style={{ ...truncate, flex: 1 }}>{file.name}</Text>
<Text size={2} className='chat-muted' style={{ flexShrink: 0, fontVariantNumeric: 'tabular-nums' }}>{file.size}</Text>
</li>
))}
</ul>
)}
</section>
</div>
</DrawerContent>
</Drawer>
</header>
<div style={{ position: 'relative', flex: 1, minHeight: 0 }}>
<div
ref={scrollerRef}
tabIndex={0}
role='region'
aria-label={`Messages in ${title}`}
onScroll={onScroll}
style={{ blockSize: '100%', overflowY: 'auto', overscrollBehavior: 'contain', outlineOffset: -2 }}
>
<ol style={{ display: 'grid', gap: 'var(--spacing-4)', margin: 0, padding: 'var(--spacing-4) var(--spacing-8) var(--spacing-8)', listStyle: 'none' }}>
{days.map((day) => {
const dayMessages = thread.filter((message) => message.day === day);
return (
<li key={day}>
<h3 style={{ display: 'flex', alignItems: 'center', gap: 'var(--spacing-6)', margin: 'var(--spacing-6) 0 0', fontSize: 'var(--font-size-1)', fontWeight: 600, color: 'var(--label-secondary)' }}>
<span aria-hidden='true' style={{ flex: 1, blockSize: 1, background: 'var(--separator-opaque)' }} />
{day}
<span aria-hidden='true' style={{ flex: 1, blockSize: 1, background: 'var(--separator-opaque)' }} />
</h3>
<ol style={{ display: 'grid', margin: 0, padding: 0, listStyle: 'none' }}>
{dayMessages.map((message, index) => (
<MessageItem
key={message.id}
message={message}
first={index === 0 || dayMessages[index - 1].author !== message.author}
receipt={message === lastOwn}
fresh={fresh.includes(message.id)}
quoted={message.replyTo ? thread.find((item) => item.id === message.replyTo) : undefined}
onToggleReaction={(name) => toggleReaction(message.id, name)}
/>
))}
</ol>
</li>
);
})}
</ol>
</div>
{!atBottom && (
<div className='chat-jump' style={{ position: 'absolute', insetInline: 0, insetBlockEnd: 'var(--spacing-6)', display: 'flex', justifyContent: 'center', pointerEvents: 'none' }}>
<span style={{ pointerEvents: 'auto', borderRadius: 'var(--radius-8)', background: 'var(--surface-primary)', boxShadow: 'var(--surface-shadow)' }}>
<Button
type='button'
size='xs'
{...ghost}
onClick={jumpToLatest}
style={{ gap: 'var(--spacing-3)', '--button-br-ratio': 0.5 } as CSSProperties}
>
<Icon size='xs' aria-hidden='true'><ArrowDown /></Icon>
Jump to latest
</Button>
</span>
</div>
)}
</div>
<form onSubmit={submit} style={{ display: 'grid', gap: 'var(--spacing-2)', padding: 'var(--spacing-2) var(--spacing-8) var(--spacing-8)' }}>
<Text size={1} className='chat-muted' style={{ display: 'flex', alignItems: 'center', gap: 'var(--spacing-3)', minBlockSize: 'var(--line-height-1)', paddingInlineStart: 'var(--spacing-2)' }}>
{typing?.conversation === activeId && (
<>
<span aria-hidden='true' style={{ display: 'inline-flex', gap: 'var(--spacing-1)' }}>
{[0, 1, 2].map((dot) => (
<span key={dot} className='chat-typing-dot' style={{ inlineSize: 'var(--spacing-2)', blockSize: 'var(--spacing-2)', borderRadius: '50%', background: 'currentColor' }} />
))}
</span>
{`${firstName(typing.person)} is typing…`}
</>
)}
</Text>
<div style={{ display: 'flex', alignItems: 'flex-end', gap: 'var(--spacing-3)' }}>
<input ref={fileRef} type='file' hidden onChange={attach} />
<IconButton size='xs' type='button' aria-label='Attach file' {...ghost} onClick={() => fileRef.current?.click()} style={{ flexShrink: 0, marginBlockEnd: 'var(--spacing-5)' }}>
<Icon size='sm'><Paperclip /></Icon>
</IconButton>
<TextArea
ref={composerRef}
rows={Math.min(lines, 6)}
fullWidth
aria-label={`Message ${title}`}
placeholder='Write a message'
value={draft}
onChange={changeDraft}
onKeyDown={onComposerKeyDown}
style={{ minWidth: 0, maxHeight: 160, resize: 'none', fieldSizing: 'content' } as CSSProperties}
/>
<IconButton size='xs' type='submit' aria-label='Send message' disabled={draft.trim() === ''} style={{ flexShrink: 0, marginBlockEnd: 'var(--spacing-5)' }}>
<Icon size='sm' className='chat-mirror'><SendHorizontal /></Icon>
</IconButton>
</div>
</form>
</section>
</div>
<VisuallyHidden asChild>
<div aria-live='polite'>{announcement}</div>
</VisuallyHidden>
</div>
);
}