"use client";

import * as React from "react";
import Link from "next/link";
import { Button } from "@/components/ui/button";
import { Avatar, AvatarImage, AvatarFallback } from "@/components/ui/avatar";
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuLabel,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu";
import {
  NavigationMenu,
  NavigationMenuContent,
  NavigationMenuItem,
  NavigationMenuLink,
  NavigationMenuList,
  NavigationMenuTrigger,
  navigationMenuTriggerStyle,
} from "@/components/ui/navigation-menu";
import { SearchIcon, Loader2 } from "lucide-react";
import { useParams, usePathname } from "next/navigation";
import { cn } from "@/lib/utils";
import Image from "next/image";
import { useSession } from "next-auth/react";
import { customSignOut } from "@/lib/auth/custom-signout";
import DynamicMenuRender from "./DynamicMenuRender";
import { MobileMenuV2 } from "./MobileMenuV2";
import { CommandMenu } from "./command-menu";
import { NotificationDropdown } from "./NotificationDropdown";
import { useVisibleMenuTree } from "@/hooks/use-visible-menu-tree";
import { useTranslation } from "@/i18n/client";
import type { MenuDomain, MenuTreeNode } from "@/lib/menu-v2/types";

// 도메인별 브랜드명
const domainBrandingKeys: Record<MenuDomain, string> = {
  evcp: "branding.evcp_main",
  partners: "branding.evcp_partners",
};

export function HeaderV2() {
  const params = useParams();
  const lng = (params?.lng as string) || "ko";
  const pathname = usePathname();
  const { data: session } = useSession();
  const { t } = useTranslation(lng, "menu");

  // 현재 도메인 결정
  const domain: MenuDomain = pathname?.includes("/partners") ? "partners" : "evcp";

  // 메뉴 데이터 로드 (tree에 드롭다운과 단일 링크가 모두 포함됨)
  const { tree, isLoading } = useVisibleMenuTree(domain);

  const userName = session?.user?.name || "";
  const initials = userName
    .split(" ")
    .map((word) => word[0]?.toUpperCase())
    .join("");

  const [isMobileMenuOpen, setIsMobileMenuOpen] = React.useState(false);
  const [openMenuKey, setOpenMenuKey] = React.useState<string>("");

  const toggleMobileMenu = () => {
    setIsMobileMenuOpen(!isMobileMenuOpen);
  };

  const toggleMenu = React.useCallback((menuKey: string) => {
    setOpenMenuKey((prev) => (prev === menuKey ? "" : menuKey));
  }, []);

  // 페이지 이동 시 메뉴 닫기
  React.useEffect(() => {
    setOpenMenuKey("");
  }, [pathname]);

  // 브랜딩 및 경로 설정
  const brandNameKey = domainBrandingKeys[domain];
  const logoHref = `/${lng}/${domain}`;
  const basePath = `/${lng}/${domain}`;

  // 다국어 텍스트 선택
  const getTitle = (node: MenuTreeNode) =>
    lng === "ko" ? node.titleKo : node.titleEn || node.titleKo;

  const getDescription = (node: MenuTreeNode) =>
    lng === "ko"
      ? node.descriptionKo
      : node.descriptionEn || node.descriptionKo;

  // 메뉴 노드가 드롭다운(자식 있음)인지 단일 링크인지 판단
  const isDropdownMenu = (node: MenuTreeNode) => 
    node.nodeType === 'menu_group' && node.children && node.children.length > 0;

  return (
    <>
      <header className="border-grid sticky top-0 z-40 w-full border-b bg-slate-100 backdrop-blur supports-[backdrop-filter]:bg-background/60">
        <div className="container-wrapper">
          <div className="container flex h-14 items-center">
            {/* 햄버거 메뉴 버튼 (모바일) */}
            <Button
              onClick={toggleMobileMenu}
              variant="ghost"
              className="-ml-2 mr-2 h-8 w-8 px-0 text-base hover:bg-transparent focus-visible:bg-transparent focus-visible:ring-0 focus-visible:ring-offset-0 md:hidden"
            >
              <svg
                xmlns="http://www.w3.org/2000/svg"
                fill="none"
                viewBox="0 0 24 24"
                strokeWidth="1.5"
                stroke="currentColor"
                className="!size-6"
              >
                <path
                  strokeLinecap="round"
                  strokeLinejoin="round"
                  d="M3.75 9h16.5m-16.5 6.75h16.5"
                />
              </svg>
              <span className="sr-only">{t("menu.toggle_menu")}</span>
            </Button>

            {/* 로고 영역 */}
            <div className="mr-4 flex-shrink-0 flex items-center gap-2 lg:mr-6">
              <Link href={logoHref} className="flex items-center gap-2">
                <Image
                  className="dark:invert"
                  src="/images/vercel.svg"
                  alt="EVCP Logo"
                  width={20}
                  height={20}
                />
                <span className="hidden font-bold lg:inline-block">
                  {t(brandNameKey)}
                </span>
              </Link>
            </div>

            {/* 네비게이션 메뉴 */}
            <div className="hidden md:block flex-1 min-w-0">
              {isLoading ? (
                <div className="flex items-center justify-center h-10">
                  <Loader2 className="h-4 w-4 animate-spin text-muted-foreground" />
                </div>
              ) : (
                <NavigationMenu
                  className="relative z-50"
                  value={openMenuKey}
                  onValueChange={setOpenMenuKey}
                >
                  <div className="w-full overflow-x-auto pb-1">
                    <NavigationMenuList className="flex-nowrap w-max">
                      {tree.map((node) => {
                        // 드롭다운 메뉴 (menu_group with children)
                        if (isDropdownMenu(node)) {
                          return (
                            <NavigationMenuItem
                              key={node.id}
                              value={String(node.id)}
                            >
                              <NavigationMenuTrigger
                                className="px-2 xl:px-3 text-sm whitespace-nowrap"
                                onClick={(e) => {
                                  e.preventDefault();
                                  e.stopPropagation();
                                  toggleMenu(String(node.id));
                                }}
                                onPointerEnter={(e) => e.preventDefault()}
                                onPointerMove={(e) => e.preventDefault()}
                                onPointerLeave={(e) => e.preventDefault()}
                              >
                                {getTitle(node)}
                              </NavigationMenuTrigger>

                              <NavigationMenuContent
                                className="max-h-[80vh] overflow-y-auto overflow-x-hidden"
                                onPointerEnter={(e) => e.preventDefault()}
                                onPointerLeave={(e) => e.preventDefault()}
                                forceMount={
                                  openMenuKey === String(node.id)
                                    ? true
                                    : undefined
                                }
                              >
                                <DynamicMenuRender
                                  groups={node.children}
                                  lng={lng}
                                  getTitle={getTitle}
                                  getDescription={getDescription}
                                  onItemClick={() => setOpenMenuKey("")}
                                />
                              </NavigationMenuContent>
                            </NavigationMenuItem>
                          );
                        }

                        // 단일 링크 메뉴 (최상위 menu)
                        if (node.nodeType === 'menu' && node.menuPath) {
                          return (
                            <NavigationMenuItem key={node.id}>
                              <Link
                                href={`/${lng}${node.menuPath}`}
                                legacyBehavior
                                passHref
                              >
                                <NavigationMenuLink
                                  className={cn(
                                    navigationMenuTriggerStyle(),
                                    "px-2 xl:px-3 text-sm whitespace-nowrap"
                                  )}
                                  onPointerEnter={(e) => e.preventDefault()}
                                  onPointerLeave={(e) => e.preventDefault()}
                                >
                                  {getTitle(node)}
                                </NavigationMenuLink>
                              </Link>
                            </NavigationMenuItem>
                          );
                        }

                        return null;
                      })}
                    </NavigationMenuList>
                  </div>
                </NavigationMenu>
              )}
            </div>

            {/* 우측 영역 */}
            <div className="ml-auto flex flex-shrink-0 items-center space-x-2">
              {/* 데스크탑에서는 CommandMenu, 모바일에서는 검색 아이콘만 */}
              <div className="hidden md:block md:w-auto">
                <CommandMenu />
              </div>
              <Button
                variant="ghost"
                size="icon"
                className="md:hidden"
                aria-label={t("common.search")}
              >
                <SearchIcon className="h-5 w-5" />
              </Button>

              {/* 알림 버튼 */}
              <NotificationDropdown />

              {/* 사용자 메뉴 */}
              <DropdownMenu>
                <DropdownMenuTrigger asChild>
                  <Avatar className="cursor-pointer h-8 w-8">
                    <AvatarImage
                      src={`${session?.user?.image}` || "/user-avatar.jpg"}
                      alt="User Avatar"
                    />
                    <AvatarFallback>{initials || "?"}</AvatarFallback>
                  </Avatar>
                </DropdownMenuTrigger>
                <DropdownMenuContent className="w-48" align="end">
                  <DropdownMenuLabel>{t("user.my_account")}</DropdownMenuLabel>
                  <DropdownMenuSeparator />
                  <DropdownMenuItem asChild>
                    <Link href={`${basePath}/settings`}>{t("user.settings")}</Link>
                  </DropdownMenuItem>
                  <DropdownMenuSeparator />
                  <DropdownMenuItem
                    onSelect={() =>
                      customSignOut({
                        callbackUrl: `${window.location.origin}${basePath}`,
                      })
                    }
                  >
                    {t("user.logout")}
                  </DropdownMenuItem>
                </DropdownMenuContent>
              </DropdownMenu>
            </div>
          </div>
        </div>

        {/* 모바일 메뉴 */}
        {isMobileMenuOpen && (
          <MobileMenuV2
            lng={lng}
            onClose={toggleMobileMenu}
            tree={tree}
            getTitle={getTitle}
            getDescription={getDescription}
          />
        )}
      </header>
    </>
  );
}