import { useEffect, useState, type ReactNode, type ElementType } from 'react';
import { PageType } from '@/types';
import { useAuth } from '@/features/auth/useAuth';
import { useBranding } from '@/features/settings/useCompanySettings';
import { ProfileSheet } from '@/features/auth/components/ProfileSheet';
import { Button } from '@/components/ui/button';
import { Badge } from '@/components/ui/badge';
import { Typography } from '@/components/ui/typography';
import { Dialog, DialogContent, DialogTitle } from '@/components/ui/dialog';
import { cn } from '@/lib/utils';
import { NotificationBell } from './NotificationBell';
import {
  LayoutDashboard,
  BarChart3,
  Briefcase,
  Users,
  UserCog,
  UserPen,
  FileSpreadsheet,
  Layers,
  LogOut,
  Search,
  Sun,
  Moon,
  Building,
  ChevronRight,
  Menu,
  X,
} from 'lucide-react';

interface LayoutProps {
  children: ReactNode;
  currentPage: PageType;
  setPage: (page: PageType) => void;
  onLogout: () => void;
}

type SidebarUser = ReturnType<typeof useAuth>['user'];

type MenuItem = { type: PageType; label: string; icon: ElementType; id: string; ownerOnly?: boolean };

// ownerOnly 항목은 최고관리자에게만 노출된다(렌더 시 user.role 로 필터).
// 그룹 라벨은 사이드바 섹션 헤더로 노출(접힘 상태에선 숨김).
const menuGroups: { label?: string; items: MenuItem[] }[] = [
  {
    items: [
      { type: 'DASHBOARD', label: '대시보드', icon: LayoutDashboard, id: 'sidebar-dashboard' },
      { type: 'STATISTICS', label: '통계', icon: BarChart3, id: 'sidebar-statistics' },
    ],
  },
  {
    label: '업무',
    items: [
      { type: 'PRODUCTS', label: '상품관리', icon: Briefcase, id: 'sidebar-products' },
      { type: 'PARTNERS', label: '협력사관리', icon: Users, id: 'sidebar-partners' },
      { type: 'QUOTATION', label: '견적관리', icon: FileSpreadsheet, id: 'sidebar-quotation' },
      { type: 'CARDS', label: '협상카드관리', icon: Layers, id: 'sidebar-cards' },
    ],
  },
  {
    label: '관리',
    items: [
      { type: 'MEMBERS', label: '회원관리', icon: UserCog, id: 'sidebar-members', ownerOnly: true },
      { type: 'SETTINGS', label: '회사 설정', icon: Building, id: 'sidebar-settings', ownerOnly: true },
    ],
  },
];

const menuItems: MenuItem[] = menuGroups.flatMap((g) => g.items);

const pageLabelMap: Record<PageType, string> = {
  DASHBOARD: '대시보드',
  STATISTICS: '통계',
  PRODUCTS: '상품관리',
  PARTNERS: '협력사관리',
  QUOTATION: '견적관리',
  CARDS: '협상카드관리',
  MEMBERS: '회원관리',
  SETTINGS: '회사 설정',
  NOTIFICATIONS: '알림',
};

export default function Layout({ children, currentPage, setPage, onLogout }: LayoutProps) {
  const { user } = useAuth();
  const branding = useBranding(); // 회사 설정 브랜딩(서비스명/로고). 미설정 시 기본 NegoData
  // 기준일시(오늘) — 로컬 타임존 기준 YYYY-MM-DD
  const today = new Date().toLocaleDateString('sv-SE');

  const [isDark, setIsDark] = useState(false);
  const [isSidebarOpen, setIsSidebarOpen] = useState(true); // 데스크톱 접기 토글
  const [isMobileOpen, setIsMobileOpen] = useState(false); // 모바일 드로어 열림
  const [isProfileOpen, setIsProfileOpen] = useState(false); // 내 정보 수정 시트
  const [isCmdOpen, setIsCmdOpen] = useState(false); // ⌘K 빠른 이동

  // 사이드바 펼침 여부(라벨/프로필 노출 기준). 모바일 드로어는 항상 펼친 상태로 본다.
  const expanded = isMobileOpen || isSidebarOpen;

  const visibleItems = menuItems.filter((item) => !item.ownerOnly || user?.role === '최고관리자');

  // ⌘K / Ctrl+K 로 빠른 이동 열기
  useEffect(() => {
    const onKey = (e: KeyboardEvent) => {
      if ((e.metaKey || e.ctrlKey) && e.key.toLowerCase() === 'k') {
        e.preventDefault();
        setIsCmdOpen((v) => !v);
      }
    };
    window.addEventListener('keydown', onKey);
    return () => window.removeEventListener('keydown', onKey);
  }, []);

  const toggleDarkMode = () => {
    setIsDark(!isDark);
    if (!isDark) {
      document.documentElement.classList.add('dark');
    } else {
      document.documentElement.classList.remove('dark');
    }
  };

  return (
    <div className="min-h-screen bg-background text-foreground flex">
      {/* 토스트는 sonner <Toaster/>(main.tsx)가 전역으로 처리한다 */}

      {/* 모바일 드로어 백드롭 */}
      {isMobileOpen && (
        <div
          className="fixed inset-0 z-30 bg-black/40 backdrop-blur-xs md:hidden"
          onClick={() => setIsMobileOpen(false)}
          aria-hidden
        />
      )}

      {/* Main Sidebar */}
      <aside
        className={cn(
          'bg-sidebar border-r border-sidebar-border flex flex-col justify-between transition-all duration-300 z-40 fixed inset-y-0 left-0',
          // 폭: 모바일은 항상 펼친 드로어(w-60), 데스크톱만 접기 토글
          'w-60',
          isSidebarOpen ? 'md:w-60' : 'md:w-16',
          // 모바일 슬라이드 인/아웃 — 데스크톱은 항상 보임
          isMobileOpen ? 'translate-x-0' : '-translate-x-full',
          'md:translate-x-0'
        )}
      >
        <div className="min-h-0 flex flex-col">
          {/* Sidebar Brand Header */}
          <div className="h-14 shrink-0 flex items-center justify-between px-4 border-b border-sidebar-border">
            {expanded && (
              <Typography as="div" variant="body" className="flex items-center gap-2 font-extrabold tracking-tight text-foreground">
                {branding.logoUrl ? (
                  <img src={branding.logoUrl} alt={branding.serviceName} className="h-4 max-w-24 object-contain" />
                ) : (
                  <span
                    aria-hidden
                    className="size-4 rounded-[5px] bg-primary"
                    style={branding.primaryColor ? { backgroundColor: branding.primaryColor } : undefined}
                  />
                )}
                {branding.serviceName}
              </Typography>
            )}

            {/* 데스크톱: 사이드바 접기/펼치기 */}
            <Button
              variant="ghost"
              onClick={() => setIsSidebarOpen((v) => !v)}
              className={cn(
                'hidden md:inline-flex p-1 h-auto rounded text-sidebar-foreground hover:bg-sidebar-accent hover:text-sidebar-accent-foreground dark:hover:bg-sidebar-accent',
                !isSidebarOpen && 'mx-auto bg-sidebar-accent'
              )}
              title={isSidebarOpen ? '메뉴 접기' : '메뉴 열기'}
            >
              <ChevronRight size={14} className={cn('size-3.5', isSidebarOpen && 'rotate-180')} />
            </Button>

            {/* 모바일: 드로어 닫기 */}
            <Button
              variant="ghost"
              onClick={() => setIsMobileOpen(false)}
              className="md:hidden p-1 h-auto rounded text-sidebar-foreground hover:bg-sidebar-accent hover:text-sidebar-accent-foreground dark:hover:bg-sidebar-accent"
              title="메뉴 닫기"
            >
              <X size={16} className="size-4" />
            </Button>
          </div>

          {/* Nav User Profile Card */}
          {expanded && <SidebarProfileCard user={user} />}

          {/* Nav Items */}
          <nav className="mt-1 px-3 overflow-y-auto">
            {menuGroups.map((group, gi) => {
              const items = group.items.filter((item) => !item.ownerOnly || user?.role === '최고관리자');
              if (items.length === 0) return null;
              return (
                <div key={group.label ?? gi} className="space-y-0.5">
                  {group.label && expanded && (
                    <Typography
                      variant="caption"
                      className="block px-3 pt-4 pb-1 text-[10px] font-bold uppercase tracking-wider text-sidebar-foreground/70"
                    >
                      {group.label}
                    </Typography>
                  )}
                  {/* 접힘 상태에선 라벨 대신 얇은 구분선으로 그룹 경계를 남긴다 */}
                  {group.label && !expanded && <div className="my-2 border-t border-sidebar-border" />}
                  {items.map((item) => (
                    <NavItem
                      key={item.type}
                      item={item}
                      isActive={currentPage === item.type}
                      isOpen={expanded}
                      onClick={() => {
                        setPage(item.type);
                        setIsMobileOpen(false);
                      }}
                    />
                  ))}
                </div>
              );
            })}
          </nav>
        </div>

        {/* Sidebar Footer Controls */}
        <div className="p-2 border-t border-sidebar-border space-y-1">
          {/* 내 정보 수정 */}
          <Button
            id="sidebar-profile-edit"
            variant="ghost"
            onClick={() => setIsProfileOpen(true)}
            className="w-full justify-start gap-3 py-1.5 px-3 h-auto rounded text-[11px] font-semibold text-sidebar-foreground hover:bg-sidebar-accent hover:text-sidebar-accent-foreground dark:hover:bg-sidebar-accent"
          >
            <UserPen size={14} className="size-3.5" />
            {expanded && <span>내 정보 수정</span>}
          </Button>

          {/* Theme switcher */}
          <Button
            variant="ghost"
            onClick={toggleDarkMode}
            className="w-full justify-start gap-3 py-1.5 px-3 h-auto rounded text-[11px] font-semibold text-sidebar-foreground hover:bg-sidebar-accent hover:text-sidebar-accent-foreground dark:hover:bg-sidebar-accent"
          >
            {isDark ? <Sun size={14} className="text-warning size-3.5" /> : <Moon size={14} className="size-3.5" />}
            {expanded && <span>{isDark ? '라이트 모드' : '다크 모드'}</span>}
          </Button>

          {/* Logout btn */}
          <Button
            id="header-logout-button"
            variant="ghost"
            onClick={onLogout}
            className="w-full justify-start gap-3 py-1.5 px-3 h-auto rounded text-[11px] font-semibold text-destructive hover:bg-destructive/10 hover:text-destructive dark:hover:bg-destructive/10"
          >
            <LogOut size={14} className="size-3.5" />
            {expanded && <span>시스템 로그아웃</span>}
          </Button>
        </div>
      </aside>

      {/* Main Container Wrapper */}
      <div
        className={cn(
          'flex-1 flex flex-col transition-all duration-300',
          // 모바일: 사이드바가 오버레이라 패딩 없음 / 데스크톱: 사이드바 폭만큼 확보
          isSidebarOpen ? 'md:pl-60' : 'md:pl-16'
        )}
      >
        {/* Global Header — 좌: 페이지명 / 중: 빠른 이동(⌘K) / 우: 알림·계정 메타 */}
        <header className="h-14 bg-card border-b border-border grid grid-cols-[1fr_auto] md:grid-cols-[1fr_auto_1fr] items-center gap-3 px-4 md:px-6 sticky top-0 z-20">
          <div className="flex items-center gap-2 md:gap-3 min-w-0">
            {/* 모바일 햄버거 */}
            <Button
              variant="ghost"
              onClick={() => setIsMobileOpen(true)}
              className="md:hidden p-1.5 h-auto rounded text-muted-foreground"
              title="메뉴 열기"
            >
              <Menu size={18} className="size-[18px]" />
            </Button>
            {/* 현재 페이지 — 모바일·데스크톱 모두 표시(로고는 사이드바/드로어 몫) */}
            <Typography as="div" variant="small" className="font-bold truncate">
              {pageLabelMap[currentPage]}
            </Typography>
          </div>

          {/* 빠른 이동 트리거 */}
          <button
            type="button"
            onClick={() => setIsCmdOpen(true)}
            className="hidden md:flex w-56 lg:w-72 items-center justify-between gap-3 rounded-lg border border-border bg-muted/40 px-3 py-1.5 text-muted-foreground transition-colors hover:bg-muted/70 cursor-pointer"
          >
            <span className="flex items-center gap-2 min-w-0">
              <Search size={13} className="shrink-0" />
              <Typography as="span" variant="caption" className="truncate">
                메뉴 빠른 이동
              </Typography>
            </span>
            <Typography as="kbd" variant="caption" className="rounded bg-muted px-1.5 py-0.5 font-mono text-[10px]">
              ⌘K
            </Typography>
          </button>

          <div className="flex items-center gap-3 md:gap-4 justify-self-end">
            <NotificationBell />
            <HeaderMeta user={user} today={today} />
          </div>
        </header>

        {/* Content Body Area */}
        <main className="flex-1 p-4 md:p-8 overflow-y-auto bg-background">
          <div className="max-w-7xl mx-auto space-y-6">{children}</div>
        </main>

        {/* Compact Admin footer info */}
        <footer className="h-10 border-t border-border/60 bg-card flex items-center justify-between px-4 md:px-8">
          <Typography variant="mono">Copyright &copy; O2O Inc. All rights reserved</Typography>
        </footer>
      </div>

      <CommandMenu
        open={isCmdOpen}
        onOpenChange={setIsCmdOpen}
        items={visibleItems}
        currentPage={currentPage}
        onSelect={(type) => {
          setPage(type);
          setIsCmdOpen(false);
        }}
      />

      {isProfileOpen && <ProfileSheet open onClose={() => setIsProfileOpen(false)} />}
    </div>
  );
}

/** ⌘K 빠른 이동 — 메뉴 검색·이동. 검색 대상 확장(견적명 등)은 추후 단계 */
function CommandMenu({
  open,
  onOpenChange,
  items,
  currentPage,
  onSelect,
}: {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  items: MenuItem[];
  currentPage: PageType;
  onSelect: (type: PageType) => void;
}) {
  const [query, setQuery] = useState('');

  useEffect(() => {
    if (!open) setQuery('');
  }, [open]);

  const q = query.trim().toLowerCase();
  const filtered = q ? items.filter((i) => i.label.toLowerCase().includes(q)) : items;

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent
        showCloseButton={false}
        className="top-[18%] translate-y-0 gap-0 overflow-hidden p-0 sm:max-w-md"
      >
        <DialogTitle className="sr-only">메뉴 빠른 이동</DialogTitle>
        <div className="flex items-center gap-2.5 border-b border-border px-3.5">
          <Search size={15} className="shrink-0 text-muted-foreground" />
          <input
            /* 커맨드 입력은 보더 없는 관례라 ui/Input 대신 소재 그대로 사용 */
            autoFocus
            value={query}
            onChange={(e) => setQuery(e.target.value)}
            onKeyDown={(e) => {
              if (e.key === 'Enter' && filtered.length > 0) onSelect(filtered[0].type);
            }}
            placeholder="이동할 메뉴 검색…"
            className="h-11 w-full bg-transparent text-sm outline-none placeholder:text-muted-foreground"
          />
        </div>
        <div className="max-h-72 overflow-y-auto p-1.5">
          {filtered.length === 0 ? (
            <Typography variant="muted" className="px-3 py-4 text-xs">
              일치하는 메뉴가 없습니다
            </Typography>
          ) : (
            filtered.map((item) => {
              const Icon = item.icon;
              return (
                <button
                  key={item.type}
                  type="button"
                  onClick={() => onSelect(item.type)}
                  className="flex w-full cursor-pointer items-center gap-2.5 rounded-md px-3 py-2 text-left transition-colors hover:bg-accent"
                >
                  <Icon size={15} className="shrink-0 text-muted-foreground" />
                  <Typography as="span" variant="small" className="flex-1 truncate">
                    {item.label}
                  </Typography>
                  {item.type === currentPage && (
                    <Typography as="span" variant="caption">
                      현재 화면
                    </Typography>
                  )}
                </button>
              );
            })
          )}
        </div>
      </DialogContent>
    </Dialog>
  );
}

/** 라벨:값 한 줄 (사이드바 프로필 카드용) */
function InfoRow({
  label,
  value,
  valueClassName,
  title,
}: {
  label: string;
  value?: string;
  valueClassName?: string;
  title?: string;
}) {
  return (
    <div className="flex justify-between items-center">
      <Typography variant="caption" className="text-sidebar-foreground">{label}</Typography>
      <Typography variant="caption" title={title} className={cn('font-bold text-foreground/90', valueClassName)}>
        {value}
      </Typography>
    </div>
  );
}

/** 사이드바 사용자 프로필 카드 */
function SidebarProfileCard({ user }: { user: SidebarUser }) {
  return (
    <div className="p-3.5 mx-3 my-3 rounded-lg bg-card border border-sidebar-border flex flex-col gap-1.5">
      <div className="flex items-center gap-2 pb-1.5 border-b border-sidebar-border/60">
        <Building size={13} className="text-sidebar-primary" />
        <Typography variant="caption" className="font-bold text-foreground truncate max-w-[140px]" title="소속 고객사">
          {user?.company}
        </Typography>
      </div>
      <div className="space-y-1">
        <InfoRow label="사용자명:" value={user?.name} />
        <InfoRow label="로그인 ID:" value={user?.loginId} valueClassName="font-mono" />
        <InfoRow
          label="이메일:"
          value={user?.email}
          title={user?.email}
          valueClassName="font-mono truncate max-w-[80px]"
        />
        <InfoRow label="연락처:" value={user?.contact} valueClassName="font-mono" />
        <div className="flex justify-between items-center pt-1 border-t border-sidebar-border/60">
          <Typography variant="caption" className="text-sidebar-foreground">권한등급:</Typography>
          <Badge variant="secondary" className="text-[10px]">{user?.role}</Badge>
        </div>
      </div>
    </div>
  );
}

/** 사이드바 메뉴 항목 */
function NavItem({
  item,
  isActive,
  isOpen,
  onClick,
}: {
  item: MenuItem;
  isActive: boolean;
  isOpen: boolean;
  onClick: () => void;
}) {
  const Icon = item.icon;
  return (
    <Button
      id={item.id}
      variant="ghost"
      onClick={onClick}
      className={cn(
        'w-full justify-start gap-3 py-2 px-3 h-auto rounded-md text-xs tracking-tight',
        isActive
          ? 'bg-sidebar-accent font-bold text-foreground hover:bg-sidebar-accent hover:text-foreground dark:hover:bg-sidebar-accent'
          : 'font-semibold text-sidebar-foreground hover:bg-sidebar-accent/60 hover:text-sidebar-accent-foreground dark:hover:bg-sidebar-accent/60'
      )}
    >
      <Icon size={16} className={cn('size-4', isActive ? 'text-primary' : 'text-sidebar-foreground/85')} />
      {isOpen && <span className="truncate">{item.label}</span>}
    </Button>
  );
}

/** 글로벌 헤더 우측 메타 정보 */
function HeaderMeta({ user, today }: { user: SidebarUser; today: string }) {
  return (
    <div className="flex items-center gap-3 md:gap-4">
      <Typography as="div" variant="caption" className="hidden lg:block">
        기준일시: <span className="font-semibold text-foreground">{today}</span>
      </Typography>

      {/* 회사명은 모바일에서만 — 데스크톱은 사이드바 브랜드에 이미 노출 */}
      <div className="flex items-center gap-2 min-w-0 md:hidden">
        <span className="inline-block h-2 w-2 rounded-full bg-success animate-pulse shrink-0" />
        <Typography as="span" variant="caption" className="shrink-0">회사:</Typography>
        <Typography
          as="span"
          variant="caption"
          id="header-company-name"
          className="font-bold text-foreground truncate max-w-[140px]"
        >
          {user?.company}
        </Typography>
      </div>

      <div className="h-4 w-px bg-border hidden lg:block" />
      <div className="hidden lg:flex items-center gap-2">
        <Typography as="span" variant="caption">관리자:</Typography>
        <Typography as="span" variant="caption" className="font-semibold text-foreground">
          {user?.name} ({user?.loginId})
        </Typography>
        <Badge variant="secondary" className="text-[9px]">{user?.role}</Badge>
      </div>
    </div>
  );
}