import { useEffect, useState } from 'react'

/**
 * Returns true when the user has requested reduced motion via OS settings.
 * Useful for disabling animations (WCAG 2.3.3).
 */
export function useReducedMotion(): boolean {
  const [reducedMotion, setReducedMotion] = useState(false)

  useEffect(() => {
    const mql = window.matchMedia('(prefers-reduced-motion: reduce)')
    setReducedMotion(mql.matches)

    const handler = (e: MediaQueryListEvent) => setReducedMotion(e.matches)
    mql.addEventListener('change', handler)
    return () => mql.removeEventListener('change', handler)
  }, [])

  return reducedMotion
}