'use client';

import Link from "next/link";
import { useEffect, useRef, useState } from "react";
import { usePathname } from "next/navigation";
import MainLogoSvg from "./svgs/mainlogosvg";
import ChevronDownSvg from "./svgs/chevrondownsvg";

const NAV_ITEMS = [
  { label: "교육 과정 목록", href: "/course-list" },
  { label: "학습 자료실", href: "/resources" },
  { label: "공지사항", href: "/notices" },
];

export default function NavBar() {
  const pathname = usePathname();
  const [isUserMenuOpen, setIsUserMenuOpen] = useState(false);
  const [userName, setUserName] = useState<string>('');
  const userMenuRef = useRef<HTMLDivElement | null>(null);
  const userButtonRef = useRef<HTMLButtonElement | null>(null);
  const hideCenterNav = /^\/[^/]+\/review$/.test(pathname);
  const isAdminPage = pathname.startsWith('/admin');

  // 사용자 정보 가져오기
  useEffect(() => {
    let isMounted = true;

    async function fetchUserInfo() {
      try {
        const token = localStorage.getItem('token');
        if (!token) {
          return;
        }

        const response = await fetch('https://hrdi.coconutmeet.net/auth/me', {
          method: 'GET',
          headers: {
            'Content-Type': 'application/json',
            Authorization: `Bearer ${token}`,
          },
        });

        if (!response.ok) {
          if (response.status === 401) {
            // 토큰이 만료되었거나 유효하지 않은 경우
            localStorage.removeItem('token');
          }
          return;
        }

        const data = await response.json();
        if (isMounted && data.name) {
          setUserName(data.name);
        }
      } catch (error) {
        console.error('사용자 정보 조회 오류:', error);
      }
    }

    fetchUserInfo();

    return () => {
      isMounted = false;
    };
  }, []);

  useEffect(() => {
    if (!isUserMenuOpen) return;
    const onDown = (e: MouseEvent) => {
      const t = e.target as Node;
      if (
        userMenuRef.current &&
        !userMenuRef.current.contains(t) &&
        userButtonRef.current &&
        !userButtonRef.current.contains(t)
      ) {
        setIsUserMenuOpen(false);
      }
    };
    const onKey = (e: KeyboardEvent) => {
      if (e.key === "Escape") setIsUserMenuOpen(false);
    };
    document.addEventListener("mousedown", onDown);
    document.addEventListener("keydown", onKey);
    return () => {
      document.removeEventListener("mousedown", onDown);
      document.removeEventListener("keydown", onKey);
    };
  }, [isUserMenuOpen]);

  return (
    <header className="bg-[#060958] h-20">
      <div className="mx-auto flex h-full w-full max-w-[1440px] items-center justify-between px-8">
        <div className="flex flex-1 items-center gap-9">
          <Link href="/" aria-label="XR LMS 홈" className="flex items-center gap-2">
            <MainLogoSvg width={46.703} height={36} />
            <span className="text-2xl font-extrabold leading-[1.45] text-white">XR LMS</span>
          </Link>
          {!hideCenterNav && !isAdminPage && (
            <nav className="flex h-full items-center">
              {NAV_ITEMS.map((item) => {
                return (
                  <Link
                    key={item.href}
                    href={item.href}
                    className={["px-4 py-2 text-[16px] font-semibold text-white"].join(" ")}
                  >
                    {item.label}
                  </Link>
                );
              })}
            </nav>
          )}
        </div>
        <div className="relative flex items-center gap-2">
          {isAdminPage ? (
            <>
              <Link href="/menu/account" className="px-4 py-2 text-[16px] font-semibold text-white">
                내 정보
              </Link>
              <Link href="/login" className="px-4 py-2 text-[16px] font-semibold text-white">
                로그아웃
              </Link>
            </>
          ) : (
            <>
              <Link href="/menu/courses" className="px-4 py-2 text-[16px] font-semibold text-white">
                내 강좌실
              </Link>
              <button
                ref={userButtonRef}
                type="button"
                onClick={() => setIsUserMenuOpen((v) => !v)}
                aria-haspopup="menu"
                aria-expanded={isUserMenuOpen}
                className="flex items-center gap-1 px-4 py-2 text-[16px] font-semibold text-white cursor-pointer"
              >
                {userName || '사용자'}
                <ChevronDownSvg
                  width={16}
                  height={16}
                  className={["transition-transform", isUserMenuOpen ? "rotate-180" : "rotate-0"].join(" ")}
                />
              </button>
              {isUserMenuOpen && (
                <div
                  ref={userMenuRef}
                  role="menu"
                  aria-label="사용자 메뉴"
                  className="absolute right-0 top-full mt-2 bg-white rounded-lg shadow-[0_0_8px_0_rgba(0,0,0,0.25)] p-3 z-50"
                >
                  <Link
                    role="menuitem"
                    href="/menu/account"
                    className="block w-full h-10 px-2 rounded-lg text-left text-[#333C47] text-[16px] font-medium leading-normal hover:bg-[rgba(236,240,255,0.5)] focus:bg-[rgba(236,240,255,0.5)] outline-none"
                    onClick={() => setIsUserMenuOpen(false)}
                  >
                    내 정보 수정
                  </Link>
                  <button
                    role="menuitem"
                    className="w-full h-10 px-2 rounded-lg text-left text-[#333C47] text-[16px] font-medium leading-normal hover:bg-[rgba(236,240,255,0.5)] focus:bg-[rgba(236,240,255,0.5)] outline-none"
                  >
                    로그아웃
                  </button>
                </div>
              )}
            </>
          )}
        </div>
      </div>
    </header>
  );
}