msgapp/src/app/components/AppHeader.tsx

"use client";
// 클라이언트 훅(useState/useEffect)을 사용하여 세션 표시/로그아웃을 처리합니다.
import Image from "next/image";
import Link from "next/link";
import { SearchBar } from "@/app/components/SearchBar";
import React from "react";

export function AppHeader() {
  const [categories, setCategories] = React.useState<Array<{ id: string; name: string; slug: string; boards: Array<{ id: string; name: string; slug: string }> }>>([]);
  const [openSlug, setOpenSlug] = React.useState<string | null>(null);
  const [mobileOpen, setMobileOpen] = React.useState(false);
  // 카테고리 로드
  React.useEffect(() => {
    fetch("/api/categories", { cache: "no-store" })
      .then((r) => r.json())
      .then((d) => setCategories(d?.categories || []))
      .catch(() => setCategories([]));
  }, []);
  return (
    <header className="relative flex items-center justify-between px-4 py-3 border-b bg-white/80 backdrop-blur supports-[backdrop-filter]:bg-white/60">
      <div className="flex items-center gap-3 z-[100]">
        <button
          aria-label="메뉴 열기"
          aria-expanded={mobileOpen}
          aria-controls="mobile-menu"
          onClick={() => setMobileOpen((v) => !v)}
          className="inline-flex h-8 w-8 items-center justify-center rounded-md border border-neutral-200 xl:hidden"
        >
          <span className="flex flex-col items-center justify-center gap-1">
            <span className="block h-0.5 w-4 bg-neutral-800" />
            <span className="block h-0.5 w-4 bg-neutral-800" />
            <span className="block h-0.5 w-4 bg-neutral-800" />
          </span>
        </button>
        <Link href="/" aria-label="홈" className="shrink-0">
          <Image src="/logo.png" alt="logo" width={120} height={28} priority className="w-20 md:w-28 xl:w-[120px] h-auto" />
        </Link>
      </div>
      <nav className="flex items-center gap-4">
        <div className="hidden items-center gap-4 xl:flex">
        {categories.map((cat) => {
          const isOpen = openSlug === cat.slug;
          return (
            <div
              key={cat.id}
              onMouseEnter={() => setOpenSlug(cat.slug)}
              onMouseLeave={() => setOpenSlug((s) => (s === cat.slug ? null : s))}
              className="relative group"
            >
              <div className="relative">
                <Link
                  href={`/boards?category=${cat.slug}`}
                  className="px-2 py-2 text-sm font-medium text-neutral-700 transition-colors duration-200 hover:text-neutral-900"
                >
                  {cat.name}
                </Link>
                <span
                  className={`pointer-events-none absolute left-1 right-1 -bottom-0.5 h-0.5 origin-left rounded bg-neutral-900 transition-all duration-200 ${
                    isOpen ? "scale-x-100 opacity-100" : "scale-x-0 opacity-0 group-hover:opacity-100 group-hover:scale-x-100"
                  }`}
                />
              </div>
              <div
                className={`absolute left-0 top-full z-50 mt-2 min-w-56 rounded-md border border-neutral-100 bg-white p-2 shadow-[0_8px_24px_rgba(0,0,0,0.08)] transition-all duration-200 ${
                  isOpen ? "opacity-100 translate-y-0" : "pointer-events-none opacity-0 -translate-y-1"
                }`}
              >
                <div className="flex flex-col gap-1">
                  {cat.boards.map((b) => (
                    <Link
                      key={b.id}
                      href={`/boards/${b.id}`}
                      className="rounded px-2 py-1 text-sm text-neutral-700 transition-colors duration-150 hover:bg-neutral-100 hover:text-neutral-900"
                    >
                      {b.name}
                    </Link>
                  ))}
                </div>
              </div>
            </div>
          );
        })}
        </div>
        <div className="hidden md:block">
          <SearchBar/>
        </div>
      </nav>
      {mobileOpen && (
        <div  className="fixed inset-0 h-[100vh] z-40 bg-black/60 backdrop-blur-sm" onClick={() => setMobileOpen(false)}>
          <div className="absolute left-0 xl:top-0 h-[100vh] w-4/5 max-w-sm bg-white p-4 shadow-xl overflow-y-auto" onClick={(e) => e.stopPropagation()}>
            <div className="mb-3 h-10 flex items-center justify-between">
            </div>
            <div className="flex flex-col gap-3">
              <SearchBar />
              {categories.map((cat) => (
                <div key={cat.id}>
                  <div className="my-2 font-semibold text-neutral-800">{cat.name}</div>
                  <div className="flex flex-col gap-1">
                    {cat.boards.map((b) => (
                      <Link key={b.id} href={`/boards/${b.id}`} onClick={() => setMobileOpen(false)} className="rounded px-2 py-1 text-neutral-700 hover:bg-neutral-100 hover:text-neutral-900">
                        {b.name}
                      </Link>
                    ))}
                  </div>
                </div>
              ))}
              <div className="mt-3" />
            </div>
          </div>
        </div>
      )}
    </header>
  );
}