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import React, { useState, useMemo, useCallback } from 'react';
interface CodeSnippetProps {
code: string;
initialLines?: number;
}
const ExpandIcon = () => (
<svg width="16" height="16" viewBox="0 0 24 24">
<path d="M19 13H13v6h-2v-6H5v-2h6V5h2v6h6v2z" fill="currentColor" />
</svg>
);
const CollapseIcon = () => (
<svg width="16" height="16" viewBox="0 0 24 24">
<path d="M19 13H5v-2h14v2z" fill="currentColor" />
</svg>
);
const CopyIcon = () => (
<svg width="16" height="16" viewBox="0 0 24 24">
<path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z" fill="currentColor" />
</svg>
);
export const CodeSnippet: React.FC<CodeSnippetProps> = React.memo(
({ code, initialLines = 5 }) => {
const [expanded, setExpanded] = useState(false);
const [copied, setCopied] = useState(false);
const lines = useMemo(() => code.split('\n'), [code]);
const shouldTruncate = useMemo(
() => lines.length > initialLines,
[lines.length, initialLines]
);
const displayedLines = useMemo(
() => (expanded || !shouldTruncate ? lines : lines.slice(0, initialLines)),
[expanded, shouldTruncate, lines, initialLines]
);
const toggleExpanded = useCallback(
() => setExpanded(prev => !prev),
[]
);
const handleCopy = useCallback(() => {
navigator.clipboard.writeText(code)
.then(() => {
setCopied(true);
setTimeout(() => setCopied(false), 2000);
})
.catch(() => {});
}, [code]);
return (
<div className="relative rounded-lg p-4 my-2 font-mono bg-gray-200 dark:bg-white/5">
{shouldTruncate && (
<div className="absolute top-2 right-2 flex space-x-2">
<button
onClick={handleCopy}
aria-label={copied ? 'Copied!' : 'Copy code'}
className="p-0 cursor-pointer text-gray-600 hover:text-gray-800"
>
<CopyIcon />
</button>
<button
onClick={toggleExpanded}
aria-label={expanded ? 'Collapse code' : 'Expand code'}
className="p-0 cursor-pointer text-gray-600 hover:text-gray-800"
>
{expanded ? <CollapseIcon /> : <ExpandIcon />}
</button>
</div>
)}
<pre className="overflow-x-auto m-0 text-sm">
{displayedLines.map((line, idx) => (
<div key={idx} className="flex">
<span className="text-gray-500 w-8 text-right pr-2">
{idx + 1}
</span>
<code className="flex-1 whitespace-pre-wrap">{line}</code>
</div>
))}
{shouldTruncate && !expanded && (
<div className="text-center text-gray-400">...</div>
)}
</pre>
</div>
);
}
);
export default CodeSnippet;
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