"use client";

import { cn } from "@/lib/utils";
import {
  BarChart2,
  ChevronLeft,
  Home,
  Settings,
} from "lucide-react";
import Link from "next/link";
import { usePathname } from "next/navigation";
import { useState } from "react";
import { MenuItem } from "../types";

const MENU_ITEMS: MenuItem[] = [
  {
    title: "대시보드",
    href: "/dashboard",
    icon: Home,
    variant: "default",
    matchExact: true,
    showInBottomNav: true,
  },
  {
    title: "자동매매",
    href: "/trade",
    icon: BarChart2,
    variant: "ghost",
    badge: "LIVE",
    showInBottomNav: true,
  },
  {
    title: "설정",
    href: "/settings",
    icon: Settings,
    variant: "ghost",
    showInBottomNav: true,
  },
];

/**
 * @description 메인 좌측 사이드바(데스크탑): 기본 축소 상태에서 hover/focus 시 확장됩니다.
 * @see features/layout/components/sidebar.tsx MENU_ITEMS 한 곳에서 메뉴/배지/모바일 탭 구성을 함께 관리합니다.
 */
export function Sidebar() {
  const pathname = usePathname();
  const [isExpanded, setIsExpanded] = useState(false);

  return (
    <aside
      className={cn(
        "relative hidden h-[calc(100vh-4rem)] shrink-0 overflow-x-visible overflow-y-auto border-r border-brand-100 bg-white px-2 py-5 transition-[width] duration-200 dark:border-brand-900/40 dark:bg-background md:sticky md:top-16 md:block",
        isExpanded ? "md:w-64" : "md:w-[74px]",
      )}
    >
      <button
        type="button"
        onClick={() => setIsExpanded((prev) => !prev)}
        aria-label={isExpanded ? "Collapse sidebar" : "Expand sidebar"}
        className={cn(
          "absolute -right-3 top-20 z-50 hidden h-8 w-8 items-center justify-center rounded-full",
          "border border-zinc-200/50 bg-white/80 shadow-lg backdrop-blur-md transition-all duration-300",
          "hover:scale-110 hover:bg-white active:scale-95",
          "dark:border-zinc-800/50 dark:bg-zinc-900/80 dark:hover:bg-zinc-900",
          "md:flex",
        )}
      >
        <ChevronLeft
          className={cn(
            "h-4 w-4 text-zinc-600 transition-transform duration-300 dark:text-zinc-300",
            isExpanded ? "rotate-0" : "rotate-180",
          )}
        />
      </button>

      <div className="h-1.5" />
      {/* ========== SIDEBAR ITEMS ========== */}
      <div className="flex flex-col space-y-1.5">
        {MENU_ITEMS.map((item) => {
          const isActive = item.matchExact
            ? pathname === item.href
            : pathname.startsWith(item.href);

          return (
            <Link
              key={item.href}
              href={item.href}
              title={item.title}
              className={cn(
                "group/item relative flex items-center rounded-xl px-3 py-2.5 text-sm transition-colors",
                "hover:bg-brand-50 hover:text-brand-800 dark:hover:bg-brand-900/30 dark:hover:text-brand-100",
                isActive
                  ? "bg-brand-100 text-brand-800 shadow-sm dark:bg-brand-900/40 dark:text-brand-100"
                  : "text-muted-foreground dark:text-brand-200/80",
              )}
            >
              {/* ========== ACTIVE BAR ========== */}
              <span
                className={cn(
                  "absolute left-0 top-1/2 h-5 -translate-y-1/2 rounded-r-full transition-all",
                  isActive ? "w-1.5 bg-brand-500" : "w-0",
                )}
              />

              {/* ========== ICON + DOT BADGE ========== */}
              <item.icon
                className={cn(
                  "h-5 w-5 shrink-0 transition-colors",
                  isActive
                    ? "text-brand-700 dark:text-brand-200"
                    : "text-zinc-400 group-hover/item:text-brand-700 dark:text-brand-300/70 dark:group-hover/item:text-brand-200",
                )}
              />

              {item.badge && !isExpanded && (
                <span className="absolute left-7 top-2 h-2 w-2 rounded-full bg-brand-500" />
              )}

              {/* ========== LABEL (EXPAND ON TOGGLE) ========== */}
              <span
                className={cn(
                  "ml-3 flex min-w-0 items-center gap-1.5 overflow-hidden whitespace-nowrap transition-all duration-200",
                  isExpanded
                    ? "max-w-[180px] opacity-100"
                    : "max-w-0 opacity-0",
                )}
              >
                <span className="truncate font-medium">{item.title}</span>
                {item.badge && (
                  <span className="shrink-0 rounded-full bg-brand-100 px-1.5 py-0.5 text-[10px] font-semibold text-brand-700">
                    {item.badge}
                  </span>
                )}
              </span>
            </Link>
          );
        })}
      </div>
    </aside>
  );
}

/**
 * @description 모바일 하단 빠른 탭 네비게이션.
 * @see features/layout/components/sidebar.tsx Sidebar와 같은 MENU_ITEMS를 공유해 중복 정의를 줄입니다.
 */
export function MobileBottomNav() {
  const pathname = usePathname();
  const bottomItems = MENU_ITEMS.filter(
    (item) => item.showInBottomNav !== false,
  );

  return (
    <nav
      aria-label="모바일 빠른 메뉴"
      className="fixed inset-x-0 bottom-0 z-40 border-t border-brand-100 bg-white/95 backdrop-blur-sm supports-backdrop-filter:bg-white/80 dark:border-brand-900/40 dark:bg-background/95 dark:supports-backdrop-filter:bg-background/80 md:hidden"
    >
      {/* ========== BOTTOM NAV ITEMS ========== */}
      <div
        className={cn(
          "grid",
          bottomItems.length === 4 ? "grid-cols-4" : "grid-cols-5",
        )}
      >
        {bottomItems.map((item) => {
          const isActive = item.matchExact
            ? pathname === item.href
            : pathname.startsWith(item.href);

          return (
            <Link
              key={`bottom-${item.href}`}
              href={item.href}
              className={cn(
                "flex min-h-16 flex-col items-center justify-center gap-1.5 text-[11px] font-medium transition-colors",
                isActive
                  ? "text-brand-700"
                  : "text-muted-foreground hover:text-brand-700 dark:text-brand-200/80 dark:hover:text-brand-200",
              )}
            >
              <span className="relative">
                <item.icon
                  className={cn("h-4 w-4", isActive && "text-brand-600")}
                />
                {item.badge && (
                  <span className="absolute -right-1 -top-1 h-2 w-2 rounded-full bg-brand-500" />
                )}
              </span>
              <span className="leading-none">{item.title}</span>
            </Link>
          );
        })}
      </div>
    </nav>
  );
}