codeboard/apps/web/src/hooks/use-scroll-animate.ts

"use client";

import { useEffect, useRef } from "react";

interface UseScrollAnimateOptions {
  threshold?: number;
  rootMargin?: string;
  once?: boolean;
}

export function useScrollAnimate<T extends HTMLElement = HTMLDivElement>({
  threshold = 0.1,
  rootMargin = "0px 0px -60px 0px",
  once = true,
}: UseScrollAnimateOptions = {}) {
  const ref = useRef<T>(null);

  useEffect(() => {
    const el = ref.current;
    if (!el) return;

    const prefersReducedMotion = window.matchMedia(
      "(prefers-reduced-motion: reduce)"
    ).matches;

    if (prefersReducedMotion) {
      el.setAttribute("data-animate", "visible");
      return;
    }

    const observer = new IntersectionObserver(
      (entries) => {
        entries.forEach((entry) => {
          if (entry.isIntersecting) {
            entry.target.setAttribute("data-animate", "visible");
            if (once) {
              observer.unobserve(entry.target);
            }
          } else if (!once) {
            entry.target.setAttribute("data-animate", "hidden");
          }
        });
      },
      { threshold, rootMargin }
    );

    observer.observe(el);
    return () => observer.disconnect();
  }, [threshold, rootMargin, once]);

  return ref;
}