import { useState } from "react";
import { Link, NavLink, useLocation } from "react-router-dom";
import { useAuthStore } from "@/stores/authStore";

/** 단일 메뉴 항목 */
interface NavItem {
  to: string;
  icon: string;
  label: string;
}

/** 드롭다운 메뉴 그룹 */
interface NavGroup {
  icon: string;
  label: string;
  children: { to: string; label: string }[];
}

type NavEntry =
  | { type: "item"; item: NavItem }
  | { type: "group"; group: NavGroup }
  | { type: "separator" };

/** 네비게이션 메뉴 정의 (가이드라인 기준) */
const navEntries: NavEntry[] = [
  { type: "item", item: { to: "/dashboard", icon: "dashboard", label: "대시보드" } },
  { type: "item", item: { to: "/services", icon: "manage_accounts", label: "서비스 관리" } },
  { type: "item", item: { to: "/messages", icon: "mail", label: "메시지 관리" } },
  { type: "item", item: { to: "/devices", icon: "devices", label: "기기 관리" } },
  {
    type: "group",
    group: {
      icon: "send",
      label: "발송 관리",
      children: [
        { to: "/statistics", label: "발송 통계" },
        { to: "/statistics/history", label: "발송 이력" },
      ],
    },
  },
  { type: "item", item: { to: "/tags", icon: "sell", label: "태그 관리" } },
  { type: "separator" },
  {
    type: "group",
    group: {
      icon: "settings",
      label: "설정",
      children: [
        { to: "/settings/notifications", label: "알림" },
        { to: "/settings", label: "마이 페이지" },
      ],
    },
  },
];

/** 단일 메뉴 아이템 */
function SidebarItem({ item }: { item: NavItem }) {
  const location = useLocation();
  const isActive = location.pathname === item.to || location.pathname.startsWith(item.to + "/");

  return (
    <NavLink
      to={item.to}
      className={`flex items-center gap-3 rounded-lg px-3 py-2 text-sm font-medium transition-colors group ${
        isActive
          ? "bg-white/10 text-white"
          : "text-gray-400 hover:bg-white/5 hover:text-white"
      }`}
    >
      <span className="material-symbols-outlined text-xl transition-colors group-hover:text-white">
        {item.icon}
      </span>
      <span className="flex-1">{item.label}</span>
    </NavLink>
  );
}

/** 드롭다운 메뉴 그룹 */
function SidebarGroup({ group }: { group: NavGroup }) {
  const location = useLocation();
  const isChildActive = group.children.some(
    (child) => location.pathname === child.to || location.pathname.startsWith(child.to + "/"),
  );
  const [isOpen, setIsOpen] = useState(isChildActive);

  return (
    <div>
      <button
        onClick={() => setIsOpen(!isOpen)}
        className={`flex w-full items-center gap-3 rounded-lg px-3 py-2 text-sm font-medium transition-colors group ${
          isChildActive
            ? "bg-white/10 text-white"
            : "text-gray-400 hover:bg-white/5 hover:text-white"
        }`}
      >
        <span className="material-symbols-outlined text-xl transition-colors group-hover:text-white">
          {group.icon}
        </span>
        <span className="flex-1 text-left">{group.label}</span>
        <span
          className="material-symbols-outlined text-base transition-transform"
          style={{ transform: isOpen ? "rotate(180deg)" : "rotate(0deg)" }}
        >
          keyboard_arrow_down
        </span>
      </button>

      {isOpen && (
        <div className="mt-1 flex flex-col gap-1 pl-9">
          {group.children.map((child) => {
            const isActive = location.pathname === child.to;
            return (
              <NavLink
                key={child.to}
                to={child.to}
                className={`flex items-center gap-2 rounded-lg px-3 py-1.5 text-sm transition-colors ${
                  isActive
                    ? "bg-white/5 text-primary"
                    : "text-gray-500 hover:bg-white/5 hover:text-gray-300"
                }`}
              >
                <span
                  className={`h-1.5 w-1.5 rounded-full ${
                    isActive ? "bg-primary" : "bg-gray-500"
                  }`}
                />
                <span>{child.label}</span>
              </NavLink>
            );
          })}
        </div>
      )}
    </div>
  );
}

export default function AppSidebar() {
  const { user, logout } = useAuthStore();

  return (
    <aside className="fixed left-0 top-0 z-50 flex h-screen w-64 flex-shrink-0 flex-col justify-between border-r border-gray-800 bg-sidebar text-white">
      <div className="flex flex-col gap-6 p-6">
        {/* 로고 → 홈 이동 */}
        <Link to="/" className="flex items-center gap-3">
          <div className="flex size-10 items-center justify-center rounded-lg border border-primary/30 bg-primary/20">
            <span className="material-symbols-outlined text-2xl text-white">grid_view</span>
          </div>
          <div className="flex flex-col">
            <h1 className="text-base font-bold leading-none tracking-tight text-white">SPMS</h1>
            <p className="mt-1 text-xs font-normal text-gray-400">Admin Console</p>
          </div>
        </Link>

        {/* 네비게이션 */}
        <nav className="flex flex-col gap-1">
          {navEntries.map((entry, idx) => {
            if (entry.type === "separator") {
              return <div key={idx} className="mx-3 my-2 h-px bg-gray-800" />;
            }
            if (entry.type === "item") {
              return <SidebarItem key={entry.item.to} item={entry.item} />;
            }
            return <SidebarGroup key={entry.group.label} group={entry.group} />;
          })}
        </nav>
      </div>

      {/* 사용자 프로필 */}
      <div className="border-t border-gray-800 p-4">
        <div className="flex items-center gap-3 px-2">
          <div className="flex size-9 items-center justify-center rounded-full bg-blue-600 text-xs font-bold tracking-wide text-white shadow-sm">
            {user?.name?.slice(0, 2)?.toUpperCase() ?? "AU"}
          </div>
          <div className="flex-1 overflow-hidden" style={{ containerType: "inline-size" }}>
            <p className="truncate text-sm font-medium text-white">
              {user?.name ?? "Admin User"}
            </p>
            <p className="text-gray-400" style={{ fontSize: "clamp(9px, 2.5cqi, 12px)" }}>
              {user?.email ?? "admin@spms.com"}
            </p>
          </div>
          <button
            onClick={logout}
            className="rounded p-1 text-gray-400 transition-colors hover:bg-white/5 hover:text-white"
            title="로그아웃"
          >
            <span className="material-symbols-outlined text-[20px]">logout</span>
          </button>
        </div>
      </div>
    </aside>
  );
}