'use client';

import * as React from 'react';

import { cn } from '@/lib/utils';

export interface FieldErrorProps extends React.HTMLAttributes<HTMLParagraphElement> {
  /**
   * The error message to render. When falsy the component renders an
   * empty live region so a screen reader still picks up subsequent
   * error messages without an aria-live remount.
   */
  message?: string | null | undefined;
  /**
   * Optional id — pair with `aria-describedby` on the associated input
   * so SR users hear the error after the input's accessible name.
   */
  id?: string;
}

/**
 * Accessible error renderer for form fields. Always renders a
 * `role="alert"` + `aria-live="polite"` region so SR users get
 * immediate feedback when validation fires. Hide visually when
 * `message` is empty without removing the region from the DOM —
 * tearing the live region down between submits delays the next
 * announcement on most assistive tech.
 *
 * Caller is responsible for setting `aria-invalid` and
 * `aria-describedby={id}` on the linked input.
 */
export function FieldError({ message, id, className, ...props }: FieldErrorProps) {
  return (
    <p
      id={id}
      role="alert"
      aria-live="polite"
      className={cn(
        'text-xs text-destructive',
        !message && 'sr-only', // empty state keeps the region for next message
        className,
      )}
      {...props}
    >
      {message ?? ''}
    </p>
  );
}
