"use client";

import Link from "next/link";
import { useEffect, useState } from "react";
import Fox from "./Fox";
import { nav } from "@/content/site";

export default function Header() {
  const [scrolled, setScrolled] = useState(false);
  const [open, setOpen] = useState(false);

  useEffect(() => {
    const onScroll = () => setScrolled(window.scrollY > 24);
    onScroll();
    window.addEventListener("scroll", onScroll, { passive: true });
    return () => window.removeEventListener("scroll", onScroll);
  }, []);

  useEffect(() => {
    document.body.style.overflow = open ? "hidden" : "";
  }, [open]);

  return (
    <header
      className={`fixed inset-x-0 top-0 z-50 transition-colors duration-500 ${
        scrolled || open ? "border-b border-line bg-ink/80 backdrop-blur-md" : "border-b border-transparent"
      }`}
    >
      <div className="mx-auto flex h-16 max-w-7xl items-center justify-between px-5 md:h-20 md:px-8">
        <Link href="/" className="flex items-center gap-3 py-2" onClick={() => setOpen(false)}>
          <Fox className="h-7 w-7 text-fg md:h-8 md:w-8" />
          <span className="font-display text-sm font-light tracking-[0.22em] whitespace-nowrap uppercase md:text-lg md:tracking-[0.3em]">
            Two Tales <span className="text-accent">VFX</span>
          </span>
        </Link>

        <nav className="hidden items-center gap-10 md:flex" aria-label="Main">
          {nav.map((item) => (
            <Link
              key={item.href}
              href={item.href}
              className="py-3 font-mono text-xs tracking-[0.2em] text-muted uppercase transition-colors hover:text-fg"
            >
              {item.label}
            </Link>
          ))}
        </nav>

        <button
          type="button"
          className="relative h-10 w-10 md:hidden"
          aria-label={open ? "Close menu" : "Open menu"}
          aria-expanded={open}
          onClick={() => setOpen((v) => !v)}
        >
          <span
            className={`absolute right-2 left-2 h-px bg-fg transition-transform duration-300 ${open ? "rotate-45" : "-translate-y-1.5"}`}
          />
          <span
            className={`absolute right-2 left-2 h-px bg-fg transition-transform duration-300 ${open ? "-rotate-45" : "translate-y-1.5"}`}
          />
        </button>
      </div>

      {open && (
        <nav className="flex h-[calc(100dvh-4rem)] flex-col gap-2 px-5 pt-10 md:hidden" aria-label="Mobile">
          {nav.map((item) => (
            <Link
              key={item.href}
              href={item.href}
              onClick={() => setOpen(false)}
              className="font-display text-4xl font-light tracking-wider uppercase"
            >
              {item.label}
            </Link>
          ))}
        </nav>
      )}
    </header>
  );
}