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/**
* T038, T048-T049: Table of Contents component
* Displays hierarchical list of document headings with smooth navigation
*/
import { ScrollArea } from '@/components/ui/scroll-area';
import { cn } from '@/lib/utils';
import type { Heading } from '@/hooks/useTableOfContents';
interface TableOfContentsProps {
headings: Heading[];
onHeadingClick: (id: string) => void;
}
export function TableOfContents({ headings, onHeadingClick }: TableOfContentsProps) {
// T049: Show empty state message when no headings
if (headings.length === 0) {
return (
<div className="h-full flex items-center justify-center p-4">
<div className="text-center text-muted-foreground">
<p className="text-sm">No headings found</p>
<p className="text-xs mt-1">Add H1, H2, or H3 headings to your note</p>
</div>
</div>
);
}
// T048: Calculate indentation based on heading level
const getIndentation = (level: number) => {
// H1 = 0px, H2 = 12px, H3 = 24px
return (level - 1) * 12;
};
return (
<div className="h-full flex flex-col border-l border-border">
<div className="p-4 border-b border-border">
<h3 className="font-semibold text-sm">Table of Contents</h3>
</div>
<ScrollArea className="flex-1">
<nav className="p-2">
<ul className="space-y-1">
{headings.map((heading) => (
<li key={heading.id}>
<button
onClick={() => onHeadingClick(heading.id)}
className={cn(
'w-full text-left text-sm py-1.5 px-2 rounded hover:bg-accent transition-colors',
'text-muted-foreground hover:text-foreground'
)}
style={{
paddingLeft: `${8 + getIndentation(heading.level)}px`,
}}
title={heading.text}
>
<span className="line-clamp-2">{heading.text}</span>
</button>
</li>
))}
</ul>
</nav>
</ScrollArea>
</div>
);
}
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