"use client";

import { useEffect } from "react";
import { usePathname } from "next/navigation";
import gsap from "gsap";

export default function Intro() {
  const pathname = usePathname();

  useEffect(() => {
    const overlay = "[data-intro-overlay]";
    const reveal = gsap.utils.toArray<HTMLElement>("[data-reveal]");
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;

    // No reveal targets (e.g. error / not-found pages) or reduced motion: skip the intro.
    if (reduce || reveal.length === 0) {
      gsap.set(overlay, { display: "none" });
      return;
    }

    gsap.set(reveal, { autoAlpha: 0, y: 12 });

    const tl = gsap.timeline({
      defaults: { ease: "power3.out" },
      onComplete: () => gsap.set(reveal, { clearProps: "all" }),
    });

    tl.to("[data-intro-mark]", { autoAlpha: 1, scale: 1, duration: 0.45, ease: "power2.out" }, 0)
      .fromTo(
        "[data-intro-bar]",
        { scaleX: 0 },
        { scaleX: 1, duration: 0.85, ease: "power2.inOut" },
        0.1,
      )
      .to(overlay, { yPercent: -100, duration: 0.5, ease: "power3.inOut" }, ">-0.1")
      .to(reveal, { autoAlpha: 1, y: 0, duration: 0.5, stagger: 0.07 }, "<0.2")
      .set(overlay, { display: "none" });

    return () => {
      tl.kill();
      gsap.set(reveal, { clearProps: "all" });
    };
  }, []);

  if (pathname !== "/") return null;

  return (
    <div
      data-intro-overlay
      className="fixed inset-0 z-50 flex items-center justify-center bg-canvas"
      aria-hidden="true"
    >
      <div
        data-intro-bar
        className="absolute inset-x-0 top-0 h-[3px] origin-left bg-accent"
        style={{ transform: "scaleX(0)" }}
      />
      <div
        data-intro-mark
        className="grid size-12 place-items-center rounded-xl bg-surface text-lg font-bold"
        style={{ opacity: 0, transform: "scale(0.94)" }}
      >
        F
      </div>
    </div>
  );
}