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import { X } from "lucide-react";
import { cn } from "../../lib/utils";
type MultiSelectProps = {
options: { value: string; label: string }[];
selected: string[];
onChange: (values: string[]) => void;
placeholder?: string;
maxItems?: number;
id?: string;
"aria-label"?: string;
"aria-labelledby"?: string;
className?: string;
};
export function MultiSelect({
options,
selected,
onChange,
placeholder = "Select options...",
maxItems,
id,
"aria-label": ariaLabel,
"aria-labelledby": ariaLabelledBy,
className,
}: MultiSelectProps) {
const [isOpen, setIsOpen] = useState(false);
const containerRef = useRef<HTMLDivElement>(null);
// O(1) option lookup by value
const optionMap = useMemo(
() => new Map(options.map((opt) => [opt.value, opt])),
[options],
);
useEffect(() => {
const handleClickOutside = (event: MouseEvent) => {
Eif (
containerRef.current &&
!containerRef.current.contains(event.target as Node)
) {
setIsOpen(false);
}
};
document.addEventListener("mousedown", handleClickOutside);
return () => document.removeEventListener("mousedown", handleClickOutside);
}, []);
const handleToggle = (value: string) => {
if (selected.includes(value)) {
onChange(selected.filter((v) => v !== value));
} else {
Iif (maxItems && selected.length >= maxItems) {
return;
}
onChange([...selected, value]);
}
};
const handleRemove = (value: string) => {
onChange(selected.filter((v) => v !== value));
};
return (
<div ref={containerRef} className={cn("relative", className)}>
<div
role="combobox"
tabIndex={0}
id={id}
aria-label={ariaLabel}
aria-labelledby={ariaLabelledBy}
aria-expanded={isOpen}
aria-haspopup="listbox"
className="flex min-h-[40px] w-full flex-wrap gap-2 rounded-md border border-border-default bg-background-elevated px-3 py-2 text-sm text-foreground-default cursor-pointer hover:border-border-strong transition-colors text-left"
onClick={() => setIsOpen(!isOpen)}
onKeyDown={(e) => {
Eif (e.key === "Enter" || e.key === " ") {
e.preventDefault();
setIsOpen(!isOpen);
}
}}
>
{selected.length === 0 ? (
<span className="text-foreground-subtle">{placeholder}</span>
) : (
selected.map((value) => {
const option = optionMap.get(value);
return (
<span
key={value}
className="inline-flex items-center gap-1 rounded bg-primary-100 px-2 py-1 text-xs font-medium text-primary-800"
>
{option?.label || value}
<button
type="button"
aria-label={`Remove ${option?.label || value}`}
onClick={(e) => {
e.stopPropagation();
handleRemove(value);
}}
className="hover:text-primary-900"
>
<X className="h-3 w-3" />
</button>
</span>
);
})
)}
</div>
{isOpen && (
<div className="absolute z-10 mt-1 max-h-60 w-full overflow-auto rounded-md border border-border-default bg-background-elevated shadow-lg">
{options.length === 0 ? (
<div className="px-3 py-2 text-sm text-foreground-muted">
No options available
</div>
) : (
options.map((option) => {
const isSelected = selected.includes(option.value);
const isDisabled =
!isSelected && maxItems && selected.length >= maxItems;
return (
<label
key={option.value}
className={cn(
"flex items-center px-3 py-2 text-sm cursor-pointer hover:bg-background-muted",
isSelected && "bg-primary-50 text-primary-900 font-medium",
isDisabled &&
"opacity-50 cursor-not-allowed pointer-events-none",
)}
>
<input
type="checkbox"
checked={isSelected}
onChange={() => !isDisabled && handleToggle(option.value)}
className="mr-2 accent-primary-500"
disabled={isDisabled || undefined}
/>
{option.label}
</label>
);
})
)}
</div>
)}
</div>
);
}
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