"use client";

import { useEffect, useRef, useState, type ReactNode } from "react";

type Direction = "up" | "left" | "right";

type Props = {
  children: ReactNode;
  className?: string;
  delay?: number;
  direction?: Direction;
};

const OFFSET: Record<Direction, string> = {
  up: "translate-y-10",
  left: "-translate-x-10",
  right: "translate-x-10",
};

export function ScrollReveal({
  children,
  className = "",
  delay = 0,
  direction = "up",
}: Props) {
  const ref = useRef<HTMLDivElement>(null);
  const [visible, setVisible] = useState(false);

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

    const observer = new IntersectionObserver(
      ([entry]) => {
        if (entry.isIntersecting) {
          setVisible(true);
          observer.unobserve(el);
        }
      },
      { threshold: 0.15, rootMargin: "0px 0px -40px 0px" },
    );

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

  return (
    <div
      ref={ref}
      className={`transition-all duration-700 ease-out ${className} ${
        visible ? "translate-x-0 translate-y-0 opacity-100" : `opacity-0 ${OFFSET[direction]}`
      }`}
      style={{ transitionDelay: `${delay}ms` }}
    >
      {children}
    </div>
  );
}