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stack/apps/web/src/components/chat/message-bubble.tsx
Jason Woltje 68e056ac91
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feat(web): port chat UI — model selector, keybindings, thinking display, styled header
2026-03-19 20:42:48 -05:00

272 lines
9.7 KiB
TypeScript

'use client';
import { useCallback, useMemo, useState } from 'react';
import ReactMarkdown from 'react-markdown';
import { cn } from '@/lib/cn';
import type { Message } from '@/lib/types';
interface MessageBubbleProps {
message: Message;
}
export function MessageBubble({ message }: MessageBubbleProps): React.ReactElement {
const isUser = message.role === 'user';
const isSystem = message.role === 'system';
const [copied, setCopied] = useState(false);
const [thinkingExpanded, setThinkingExpanded] = useState(false);
const { response, thinking } = useMemo(
() => parseThinking(message.content, message.thinking),
[message.content, message.thinking],
);
const handleCopy = useCallback(async (): Promise<void> => {
try {
await navigator.clipboard.writeText(response);
setCopied(true);
window.setTimeout(() => setCopied(false), 1800);
} catch (error) {
console.error('[MessageBubble] Failed to copy message:', error);
}
}, [response]);
if (isSystem) {
return (
<div className="flex justify-center">
<div
className="max-w-[42rem] rounded-full border px-3 py-1.5 text-xs backdrop-blur-sm"
style={{
borderColor: 'var(--color-border)',
backgroundColor: 'color-mix(in srgb, var(--color-surface) 70%, transparent)',
color: 'var(--color-muted)',
}}
>
<span>{response}</span>
</div>
</div>
);
}
return (
<div className={cn('group flex', isUser ? 'justify-end' : 'justify-start')}>
<div
className={cn(
'flex max-w-[min(78ch,85%)] flex-col gap-2',
isUser ? 'items-end' : 'items-start',
)}
>
<div className={cn('flex items-center gap-2 text-[11px]', isUser && 'flex-row-reverse')}>
<span className="font-medium text-[var(--color-text-2)]">
{isUser ? 'You' : 'Assistant'}
</span>
{!isUser && message.model ? (
<span
className="rounded-full border px-2 py-0.5 font-medium text-[var(--color-text-2)]"
style={{
backgroundColor: 'color-mix(in srgb, var(--color-surface-2) 82%, transparent)',
borderColor: 'var(--color-border)',
}}
title={message.provider ? `Provider: ${message.provider}` : undefined}
>
{message.model}
</span>
) : null}
{!isUser && typeof message.totalTokens === 'number' && message.totalTokens > 0 ? (
<span
className="rounded-full border px-2 py-0.5 text-[var(--color-muted)]"
style={{ borderColor: 'var(--color-border)' }}
>
{formatTokenCount(message.totalTokens)}
</span>
) : null}
<span className="text-[var(--color-muted)]">{formatTimestamp(message.createdAt)}</span>
</div>
{thinking && !isUser ? (
<div
className="w-full overflow-hidden rounded-2xl border"
style={{
backgroundColor: 'color-mix(in srgb, var(--color-surface-2) 88%, transparent)',
borderColor: 'var(--color-border)',
}}
>
<button
type="button"
onClick={() => setThinkingExpanded((prev) => !prev)}
className="flex w-full items-center gap-2 px-3 py-2 text-left text-xs font-medium text-[var(--color-text-2)] transition-colors hover:bg-black/5"
aria-expanded={thinkingExpanded}
>
<span
className={cn(
'inline-block text-[10px] transition-transform',
thinkingExpanded && 'rotate-90',
)}
>
</span>
<span>Chain of thought</span>
<span className="ml-auto text-[var(--color-muted)]">
{thinkingExpanded ? 'Hide' : 'Show'}
</span>
</button>
{thinkingExpanded ? (
<pre
className="overflow-x-auto border-t px-3 py-3 font-mono text-xs leading-6 whitespace-pre-wrap"
style={{
borderColor: 'var(--color-border)',
backgroundColor: 'var(--color-bg-deep)',
color: 'var(--color-text-2)',
}}
>
{thinking}
</pre>
) : null}
</div>
) : null}
<div
className={cn(
'relative w-full rounded-3xl px-4 py-3 text-sm shadow-[var(--shadow-ms-sm)]',
!isUser && 'border',
)}
style={{
backgroundColor: isUser ? 'var(--color-ms-blue-500)' : 'var(--color-surface)',
color: isUser ? '#fff' : 'var(--color-text)',
borderColor: isUser ? 'transparent' : 'var(--color-border)',
}}
>
<div className="max-w-none">
<ReactMarkdown
components={{
p: ({ children }) => <p className="mb-3 leading-7 last:mb-0">{children}</p>,
ul: ({ children }) => <ul className="mb-3 list-disc pl-5 last:mb-0">{children}</ul>,
ol: ({ children }) => (
<ol className="mb-3 list-decimal pl-5 last:mb-0">{children}</ol>
),
li: ({ children }) => <li className="mb-1">{children}</li>,
a: ({ href, children }) => (
<a
href={href}
className="font-medium underline underline-offset-4"
target="_blank"
rel="noreferrer"
>
{children}
</a>
),
pre: ({ children }) => <div className="mb-3 last:mb-0">{children}</div>,
code: ({ className, children, ...props }) => {
const language = className?.replace('language-', '');
const content = String(children).replace(/\n$/, '');
const isInline = !className;
if (isInline) {
return (
<code
className="rounded-md px-1.5 py-0.5 font-mono text-[0.9em]"
style={{
backgroundColor:
'color-mix(in srgb, var(--color-bg-deep) 76%, transparent)',
}}
{...props}
>
{children}
</code>
);
}
return (
<div
className="overflow-hidden rounded-2xl border"
style={{
backgroundColor: 'var(--color-bg-deep)',
borderColor: 'var(--color-border)',
}}
>
<div
className="border-b px-3 py-2 font-mono text-[11px] uppercase tracking-[0.18em] text-[var(--color-muted)]"
style={{ borderColor: 'var(--color-border)' }}
>
{language || 'code'}
</div>
<pre className="overflow-x-auto p-3">
<code
className={cn('font-mono text-[13px] leading-6', className)}
{...props}
>
{content}
</code>
</pre>
</div>
);
},
blockquote: ({ children }) => (
<blockquote
className="mb-3 border-l-2 pl-4 italic last:mb-0"
style={{ borderColor: 'var(--color-ms-blue-500)' }}
>
{children}
</blockquote>
),
}}
>
{response}
</ReactMarkdown>
</div>
<button
type="button"
onClick={() => void handleCopy()}
className="absolute -right-2 -top-2 rounded-full border p-2 opacity-0 shadow-[var(--shadow-ms-md)] transition-all group-hover:opacity-100 focus:opacity-100"
style={{
backgroundColor: 'var(--color-surface)',
borderColor: 'var(--color-border)',
color: copied ? 'var(--color-success)' : 'var(--color-text-2)',
}}
aria-label={copied ? 'Copied' : 'Copy message'}
title={copied ? 'Copied' : 'Copy message'}
>
{copied ? '✓' : '⧉'}
</button>
</div>
</div>
</div>
);
}
function parseThinking(
content: string,
thinking?: string,
): { response: string; thinking: string | null } {
if (thinking) {
return { response: content, thinking };
}
const regex = /<(?:thinking|think)>([\s\S]*?)<\/(?:thinking|think)>/gi;
const matches = [...content.matchAll(regex)];
if (matches.length === 0) {
return { response: content, thinking: null };
}
return {
response: content.replace(regex, '').trim(),
thinking:
matches
.map((match) => match[1]?.trim() ?? '')
.filter(Boolean)
.join('\n\n') || null,
};
}
function formatTimestamp(createdAt: string): string {
return new Date(createdAt).toLocaleTimeString([], {
hour: '2-digit',
minute: '2-digit',
});
}
function formatTokenCount(totalTokens: number): string {
if (totalTokens >= 1_000_000) return `${(totalTokens / 1_000_000).toFixed(1)}M tokens`;
if (totalTokens >= 1_000) return `${(totalTokens / 1_000).toFixed(1)}k tokens`;
return `${totalTokens} tokens`;
}