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import { useEffect, useState } from 'react';
import { DataTable, type DataTableColumn } from '@/components/ui/DataTable';
type TokenKind = 'color' | 'spacing' | 'radius';
interface TokenValue {
/** Value as authored in the cascade (e.g. `var(--color-palette-indigo-70)`). */
authored: string;
/** Fully resolved value from getComputedStyle (e.g. `#5c62e8`). */
resolved: string;
}
/** Authored values of `tokens` from every rule that matches <html>; later rules win. */
function readAuthored(tokens: string[]): Record<string, string> {
const root = document.documentElement;
const authored: Record<string, string> = {};
for (const sheet of Array.from(document.styleSheets)) {
let rules: CSSRuleList;
try {
rules = sheet.cssRules;
} catch {
continue; // cross-origin stylesheet
}
for (const rule of Array.from(rules)) {
if (!(rule instanceof CSSStyleRule)) continue;
try {
if (!root.matches(rule.selectorText)) continue;
} catch {
continue; // selector matches() can't take, e.g. ::selection
}
for (const name of tokens) {
const v = rule.style.getPropertyValue(name).trim();
if (v) authored[name] = v;
}
}
}
return authored;
}
/**
* A group of design tokens with their live values. Re-reads when ThemeProvider
* switches `data-theme` on <html>. Colors render as a table (swatch, token, the
* palette token it references, resolved value); spacing and radius as a grid of
* preview boxes.
*/
export function TokenSwatches({ tokens, kind }: { tokens: string[]; kind: TokenKind }) {
const [values, setValues] = useState<Record<string, TokenValue>>({});
useEffect(() => {
const read = () => {
const cs = getComputedStyle(document.documentElement);
const authored = readAuthored(tokens);
const next: Record<string, TokenValue> = {};
for (const name of tokens) {
const resolved = cs.getPropertyValue(name).trim();
next[name] = { authored: authored[name] || resolved, resolved };
}
setValues(next);
};
read();
const observer = new MutationObserver(read);
observer.observe(document.documentElement, { attributes: true, attributeFilter: ['data-theme'] });
return () => observer.disconnect();
}, [tokens]);
if (kind === 'color') {
return (
<DataTable
columns={COLOR_COLUMNS}
rows={tokens.map((name) => ({ name, ...(values[name] ?? { authored: '', resolved: '' }) }))}
getRowKey={(row) => row.name}
/>
);
}
return (
<div className="style-preview__tokens">
{tokens.map((name) => (
<div key={name} className="style-preview__token">
{kind === 'radius' ? (
<span className="style-preview__radius" style={{ borderRadius: `var(${name})` }} />
) : (
<span className="style-preview__spacing">
<span className="style-preview__spacing-bar" style={{ width: `var(${name})` }} />
</span>
)}
<div className="style-preview__token-text">
<code className="style-preview__token-name">{name}</code>
<code className="style-preview__token-value">{values[name]?.resolved || '…'}</code>
</div>
</div>
))}
</div>
);
}
interface ColorRow extends TokenValue {
name: string;
}
const COLOR_COLUMNS: DataTableColumn<ColorRow>[] = [
{
header: 'Swatch',
width: '4.5rem',
cell: (row) => <span className="style-preview__swatch" style={{ background: `var(${row.name})` }} />,
},
{
header: 'Token',
cell: (row) => (
<code className="code-chip style-preview__mono style-preview__mono--intense">{row.name}</code>
),
},
{
header: 'References',
cell: (row) =>
row.authored.startsWith('var(') ? (
<code className="code-chip style-preview__mono style-preview__mono--subtle">{row.authored}</code>
) : (
<span className="style-preview__mono">—</span>
),
},
{
header: 'Value',
cell: (row) => <code className="style-preview__mono">{row.resolved || '…'}</code>,
},
];
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