import { useEffect, useState, type CSSProperties, type MouseEvent, type ReactNode } from "react"
import type { Meta, StoryObj } from "@storybook/react-vite"
import { BellIcon, ChartColumnIcon, SearchIcon, SettingsIcon, type LucideIcon } from "lucide-react"
import {
  Avatar,
  AvatarFallback,
  AvatarImage,
  Badge,
  Button,
  Command,
  CommandEmpty,
  CommandGroup,
  CommandInput,
  CommandItem,
  CommandList,
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuLabel,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
  GNB,
  GNBBrand,
  GNBMobileGroup,
  GNBMobileLink,
  GNBMobileMenu,
  GNBNav,
  GNBUser,
  GNBUtilities,
  LNB,
  LNBGroup,
  LNBItem,
  LNBMobileGroup,
  LNBMobileLink,
  LNBNav,
  NavigationMenu,
  NavigationMenuContent,
  NavigationMenuItem,
  NavigationMenuLink,
  NavigationMenuList,
  NavigationMenuTrigger,
  Popover,
  PopoverContent,
  PopoverTrigger,
  Tooltip,
  TooltipContent,
  TooltipTrigger,
} from "@hm-design/ui"
import { StoryPage, StoryPageHeader, StorySection } from "@/components/story-page"

// GNB is a composition pattern. Layout visual reference is the ui-viz GNB (green 70px bar, centered menu, Beige current item joined to
// the content, White 2-depth panel, text-only profile); every part inside is an HM component. The menu data, the user and the current
// location below are local sample data for this Story only (no network, no auth, no router). The desktop / mobile switch follows the
// viewport (1024px): narrow the Story to 390px to see the hamburger and the Sheet menu.
// GNBUser's default accessible name includes both the visible name and description; explicit labels must preserve them.

type Destination = { id: string; label: string }
type NavItem = { id: string; label: string; children?: Destination[] }

const navItems: NavItem[] = [
  { id: "dashboard", label: "대시보드" },
  {
    id: "projects",
    label: "프로젝트",
    children: [
      { id: "projects/active", label: "진행 중 프로젝트" },
      { id: "projects/done", label: "완료 프로젝트" },
      { id: "projects/templates", label: "프로젝트 템플릿 관리와 기준 설정을 위한 긴 하위 메뉴 이름" },
    ],
  },
  { id: "reports", label: "리포트" },
  {
    id: "admin",
    label: "관리",
    children: [
      { id: "admin/users", label: "사용자 관리" },
      { id: "admin/org", label: "조직 관리" },
    ],
  },
]

const longNavItems: NavItem[] = [
  { id: "dashboard", label: "통합 대시보드와 현황 요약" },
  { id: "projects", label: "전사 프로젝트 포트폴리오 관리", children: [{ id: "projects/active", label: "진행 중 프로젝트" }] },
  { id: "reports", label: "정기 점검 결과 리포트" },
]

const photo =
  "data:image/svg+xml;utf8," +
  encodeURIComponent('<svg xmlns="http://www.w3.org/2000/svg" width="80" height="80"><rect width="80" height="80" fill="#266651"/><circle cx="40" cy="31" r="14" fill="#bddfd4"/><rect x="14" y="50" width="52" height="40" rx="22" fill="#bddfd4"/></svg>')
// An address that cannot load, so the Radix fallback shows.
const brokenPhoto = "data:image/png;base64,broken"

const user = { image: photo, name: "김한맥", description: "프로젝트 관리자" }
const longUser = { image: brokenPhoto, name: "김한맥 (한맥기술 인프라사업본부 스마트시설팀)", description: "통합 시스템 관리자 · 인프라사업본부" }

// A test logo (not a Hanmac asset), only to check the logo layout.
const testLogo =
  "data:image/svg+xml;utf8," +
  encodeURIComponent('<svg xmlns="http://www.w3.org/2000/svg" width="120" height="32"><rect width="120" height="32" rx="4" fill="#fff" fill-opacity=".9"/><text x="60" y="21" font-size="13" font-weight="700" text-anchor="middle" fill="#123328">TEST LOGO</text></svg>')

// The content that follows the bar: positioned, later in the DOM, top corners rounded by the join, so the bar's green continues behind it.
const contentStyle: CSSProperties = {
  position: "relative",
  minHeight: 220,
  padding: 34,
  borderRadius: "var(--hm-gnb-join) var(--hm-gnb-join) 0 0",
  background: "var(--hm-sem-bg-content)",
}

function isCurrent(current: string, id: string) {
  return current === id || current.startsWith(`${id}/`)
}

function SearchAction() {
  return (
    <Popover>
      <Tooltip>
        <TooltipTrigger asChild>
          <PopoverTrigger asChild>
            <Button type="button" variant="ghost" size="icon" aria-label="검색">
              <SearchIcon aria-hidden="true" />
            </Button>
          </PopoverTrigger>
        </TooltipTrigger>
        <TooltipContent>검색</TooltipContent>
      </Tooltip>
      <PopoverContent align="end" style={{ "--hm-popover-padding": "0", "--hm-popover-width": "320px" } as CSSProperties}>
        <Command>
          <CommandInput placeholder="메뉴·프로젝트 검색" />
          <CommandList>
            <CommandEmpty>결과가 없습니다.</CommandEmpty>
            <CommandGroup heading="바로가기">
              <CommandItem>진행 중 프로젝트</CommandItem>
              <CommandItem>월간 리포트</CommandItem>
              <CommandItem>사용자 관리</CommandItem>
            </CommandGroup>
          </CommandList>
        </Command>
      </PopoverContent>
    </Popover>
  )
}

function NotificationAction({ count = 3 }: { count?: number }) {
  return (
    <Popover>
      <Tooltip>
        <TooltipTrigger asChild>
          <PopoverTrigger asChild>
            <Button type="button" variant="ghost" size="icon" aria-label={`알림 ${count}건`} style={{ position: "relative" }}>
              <BellIcon aria-hidden="true" />
              <Badge
                variant="destructive"
                aria-hidden="true"
                className="size-6"
                style={{ position: "absolute", top: -8, right: -8, padding: 0, borderRadius: "50%" }}
              >
                {count}
              </Badge>
            </Button>
          </PopoverTrigger>
        </TooltipTrigger>
        <TooltipContent>알림</TooltipContent>
      </Tooltip>
      <PopoverContent align="end" style={{ "--hm-popover-width": "300px" } as CSSProperties}>
        <div className="grid gap-2">
          <p className="font-bold">새 알림</p>
          <p>1호선 구간 점검 결과가 등록되었습니다.</p>
          <p>월간 리포트 승인이 요청되었습니다.</p>
        </div>
      </PopoverContent>
    </Popover>
  )
}

function UserMenu({ person, defaultOpen }: { person: { name: string; description: string; image?: string }; defaultOpen?: boolean }) {
  return (
    <DropdownMenu defaultOpen={defaultOpen}>
      <DropdownMenuTrigger asChild>
        <GNBUser name={person.name} description={person.description}>
          <Avatar>
            {person.image ? <AvatarImage src={person.image} alt="" /> : null}
            <AvatarFallback>{person.name.slice(0, 1)}</AvatarFallback>
          </Avatar>
        </GNBUser>
      </DropdownMenuTrigger>
      <DropdownMenuContent align="end">
        <DropdownMenuLabel>{person.name}</DropdownMenuLabel>
        <DropdownMenuItem>프로필</DropdownMenuItem>
        <DropdownMenuItem>설정</DropdownMenuItem>
        <DropdownMenuSeparator />
        <DropdownMenuItem variant="destructive">로그아웃</DropdownMenuItem>
      </DropdownMenuContent>
    </DropdownMenu>
  )
}

function Bar({
  items = navItems,
  person = user,
  eyebrow = "한맥 업무 시스템",
  brand = "프로젝트 대시보드",
  logo,
  initial = "dashboard",
  openMenu,
  userOpen,
  mobileOpen,
  sticky,
  utilities,
  onCurrent,
  current: currentProp,
  mobileChildren,
  mobileMenuOpen,
  onMobileMenuOpenChange,
}: {
  items?: NavItem[]
  person?: { name: string; description: string }
  eyebrow?: string
  brand?: string
  logo?: string
  initial?: string
  openMenu?: string
  userOpen?: boolean
  mobileOpen?: boolean
  sticky?: boolean
  utilities?: boolean
  onCurrent?: (id: string) => void
  current?: string
  mobileChildren?: ReactNode
  mobileMenuOpen?: boolean
  onMobileMenuOpenChange?: (open: boolean) => void
}) {
  const [localCurrent, setCurrent] = useState(initial)
  const current = currentProp ?? localCurrent
  const go = (id: string) => (event: MouseEvent) => {
    event.preventDefault()
    if (currentProp === undefined) setCurrent(id)
    onCurrent?.(id)
  }
  return (
    <GNB sticky={sticky}>
      <GNBMobileMenu title="메뉴" defaultOpen={mobileOpen} open={mobileMenuOpen} onOpenChange={onMobileMenuOpenChange}>
        {mobileChildren ?? items.map((item) =>
          item.children ? (
            <GNBMobileGroup key={item.id} label={item.label}>
              {item.children.map((child) => (
                <GNBMobileLink key={child.id} href={`#${child.id}`} active={current === child.id} onClick={go(child.id)}>
                  {child.label}
                </GNBMobileLink>
              ))}
            </GNBMobileGroup>
          ) : (
            <GNBMobileLink key={item.id} href={`#${item.id}`} active={current === item.id} onClick={go(item.id)}>
              {item.label}
            </GNBMobileLink>
          )
        )}
      </GNBMobileMenu>
      <GNBBrand href="#dashboard" onClick={go("dashboard")}>
        {logo ? <img src={logo} alt="" /> : null}
        <span>
          {eyebrow ? <small>{eyebrow}</small> : null}
          <strong>{brand}</strong>
        </span>
      </GNBBrand>
      <GNBNav>
        <NavigationMenu viewport={false} aria-label="주 메뉴" defaultValue={openMenu}>
          <NavigationMenuList>
            {items.map((item) =>
              item.children ? (
                <NavigationMenuItem key={item.id} value={item.id}>
                  <NavigationMenuTrigger aria-current={isCurrent(current, item.id) ? "page" : undefined}>{item.label}</NavigationMenuTrigger>
                  <NavigationMenuContent>
                    <ul>
                      {item.children.map((child) => (
                        <li key={child.id}>
                          <NavigationMenuLink href={`#${child.id}`} active={current === child.id} onClick={go(child.id)}>
                            {child.label}
                          </NavigationMenuLink>
                        </li>
                      ))}
                    </ul>
                  </NavigationMenuContent>
                </NavigationMenuItem>
              ) : (
                <NavigationMenuItem key={item.id}>
                  <NavigationMenuLink href={`#${item.id}`} active={current === item.id} onClick={go(item.id)}>
                    {item.label}
                  </NavigationMenuLink>
                </NavigationMenuItem>
              )
            )}
          </NavigationMenuList>
        </NavigationMenu>
      </GNBNav>
      <GNBUtilities>
        {utilities ? (
          <>
            <SearchAction />
            <NotificationAction />
          </>
        ) : null}
        <UserMenu person={person} defaultOpen={userOpen} />
      </GNBUtilities>
    </GNB>
  )
}

// The bar with the content that follows it (the GNB Mode page owns this part; here it only shows the join).
function Page({ children, label }: { children: ReactNode; label?: string }) {
  return (
    <div>
      {children}
      <div style={contentStyle}>
        <p className="text-sm text-muted-foreground">{label ?? "연결된 콘텐츠 영역: GNB는 자기 높이와 12px 접점까지만 차지합니다."}</p>
      </div>
    </div>
  )
}

function StickyPage() {
  return (
    <div
      role="region"
      aria-label="Sticky GNB 스크롤 예시"
      tabIndex={0}
      style={{ height: 360, overflow: "auto", scrollbarWidth: "none" }}
    >
      <Bar sticky />
      <div style={{ ...contentStyle, minHeight: 900 }} className="grid content-start gap-3 text-sm text-muted-foreground">
        {Array.from({ length: 24 }, (_, i) => (
          <p key={i}>스크롤 본문 {i + 1}</p>
        ))}
      </div>
    </div>
  )
}

// Consumer-owned data and route state; every menu face/disclosure is an existing public LNB part.
type SidebarNode = { id: string; label: string; icon?: LucideIcon; children?: SidebarNode[] }
const sidebarNodes: SidebarNode[] = [
  { id: "dashboard", label: "대시보드" },
  {
    id: "projects", label: "프로젝트 관리", children: [
      { id: "projects/design", label: "디자인 관리", children: [
        { id: "projects/design/tokens", label: "토큰 관리" },
        { id: "projects/design/components", label: "컴포넌트 설계와 사용 규칙을 검토하는 긴 메뉴 이름" },
        { id: "projects/design/layout", label: "레이아웃 관리" },
      ] },
      { id: "projects/tasks", label: "업무 목록" },
      { id: "projects/schedule", label: "일정 관리" },
      ...Array.from({ length: 8 }, (_, i) => ({ id: `projects/extra-${i + 1}`, label: `프로젝트 점검 메뉴 ${i + 1}` })),
    ],
  },
  { id: "reports", label: "현황 보고", icon: ChartColumnIcon },
  { id: "admin", label: "관리", children: [
    { id: "admin/users", label: "사용자 관리" },
    { id: "admin/org", label: "조직 관리" },
  ] },
  { id: "settings", label: "설정", icon: SettingsIcon },
]
const sidebarGnbItems: NavItem[] = navItems.map(item => item.id === "projects" ? {
  ...item, children: [
    { id: "projects/design/tokens", label: "토큰 관리" },
    { id: "projects/tasks", label: "업무 목록" },
  ],
} : item)

function SidebarPage({ fullHeight = false, color = "green" }: { fullHeight?: boolean; color?: "green" | "brown" }) {
  const [current, setCurrent] = useState("projects/design/tokens")
  const [groups, setGroups] = useState<Record<string, boolean>>({ projects: true, "projects/design": true })
  const [mobileOpen, setMobileOpen] = useState(false)
  // Same 1024/1023 contract as LNBMobileMenu; the sole Sheet belongs to the GNB header.
  useEffect(() => {
    const desktop = window.matchMedia("(min-width: 1024px)")
    const closeOnDesktop = () => { if (desktop.matches) setMobileOpen(false) }
    desktop.addEventListener("change", closeOnDesktop)
    return () => desktop.removeEventListener("change", closeOnDesktop)
  }, [])
  const go = (id: string) => (event: MouseEvent) => {
    event.preventDefault()
    setCurrent(id)
    // LNBMobileLink has its own context: close this GNB-owned Sheet in the shared route handler.
    setMobileOpen(false)
  }
  const desktopMenu = (nodes: SidebarNode[]): ReactNode => nodes.map(node => node.children ? (
    <LNBGroup key={node.id} label={node.label} current={isCurrent(current, node.id)}
      open={groups[node.id] ?? false} onOpenChange={open => setGroups(state => ({ ...state, [node.id]: open }))}>
      {desktopMenu(node.children)}
    </LNBGroup>
  ) : (
    <LNBItem key={node.id} href={`#${node.id}`} active={current === node.id} onClick={go(node.id)}>
      {node.icon ? <node.icon aria-hidden="true" /> : null}{node.label}
    </LNBItem>
  ))
  // LNB's existing mobile view is an expanded link list, not a new disclosure menu.
  const mobileMenu = (nodes: SidebarNode[]): ReactNode => nodes.map(node => node.children ? (
    <LNBMobileGroup key={node.id} label={node.label}>{mobileMenu(node.children)}</LNBMobileGroup>
  ) : (
    <LNBMobileLink key={node.id} href={`#${node.id}`} active={current === node.id} onClick={go(node.id)}>{node.label}</LNBMobileLink>
  ))
  return (
    <div data-hm-gnb-layout="sidebar" data-hm-color={color} style={{ height: fullHeight ? "100dvh" : 560 }}>
      <Bar items={sidebarGnbItems} current={current} onCurrent={setCurrent}
        mobileMenuOpen={mobileOpen} onMobileMenuOpenChange={setMobileOpen}
        mobileChildren={<div data-slot="lnb-mobile-nav">{mobileMenu(sidebarNodes)}</div>} />
      <div data-hm-gnb-body>
        <LNB data-hm-gnb-sidebar>
          <LNBNav aria-label="서비스 메뉴">{desktopMenu(sidebarNodes)}</LNBNav>
        </LNB>
        <main data-hm-gnb-main>
          <div style={{ padding: contentStyle.padding }}>
            <h2 className="text-lg font-bold">프로젝트 업무 화면</h2>
            <p className="mt-2 text-sm text-muted-foreground" data-current-menu>선택: {current}</p>
            <p className="mt-4 text-sm">선택한 메뉴의 콘텐츠를 표시합니다.</p>
          </div>
        </main>
      </div>
    </div>
  )
}

const meta = { title: "Patterns/Layout/GNB", component: GNB, parameters: { layout: "fullscreen", controls: { disable: true } } } satisfies Meta<typeof GNB>
export default meta
type Story = StoryObj<typeof meta>

// Representative Story: the green bar with a current item, an open 2-depth panel, long labels, a logo, the optional utility icons and
// sticky. Menus and the user menu open for real. Narrow the page to 390px for the mobile bar (hamburger → Sheet).
// Each GNB fills its specimen parent inside the same Inner as the page and section headings.
export const All: Story = {
  name: "GNB",
  render: () => (
    <StoryPage>
      <StoryPageHeader
        title="GNB"
        description="1024px 이상 Desktop 메뉴 · 1023px 이하 햄버거 → Sheet"
      />
      <StorySection
        title="Overview"
        description="현재 위치 Beige · hover Black 10% · 하위 패널은 hover / click"
      >
        <Page>
          <Bar />
        </Page>
      </StorySection>
      <StorySection
        title="States · Navigation Menu Open"
        description="하위 현재 위치 Beige · 긴 하위 이름은 패널 폭 확장"
      >
        <div style={{ minHeight: 360 }}>
          <Page label="프로젝트 > 진행 중 프로젝트">
            <Bar initial="projects/active" openMenu="projects" />
          </Page>
        </div>
      </StorySection>
      <StorySection
        title="Variants · Long Labels"
        description="브랜드·사용자는 말줄임 · 메뉴는 줄바꿈 없이 영역에서 잘림"
      >
        <Page>
          <Bar items={longNavItems} person={longUser} eyebrow="한맥기술 인프라 통합 시스템" brand="스마트 시설물 통합 관리 시스템" />
        </Page>
      </StorySection>
      <StorySection
        title="Variants · With Logo"
        description="로고는 있을 때만 원본 비율 · 테스트 이미지(한맥 로고 아님)"
      >
        <Page>
          <Bar logo={testLogo} />
        </Page>
      </StorySection>
      <StorySection
        title="Variants · Utilities"
        description="선택 사항 · 검색·알림은 GNBUtilities에 ghost Button 아이콘 조합"
      >
        <Page>
          <Bar utilities />
        </Page>
      </StorySection>
      <StorySection
        title="Usage · Sticky"
        description="스크롤 영역 상단에 고정"
      >
        <StickyPage />
      </StorySection>
      <StorySection title="Usage · GNB Sidebar"
        description="기존 Reference 전용 · 신규 AI GNB_ONLY 화면에는 Sidebar 생성 금지">
        <SidebarPage />
      </StorySection>
      <StorySection title="Usage · Brown 콘텐츠 LNB" description="Brown 선택·Hover · Green 선택색 혼용 금지"><SidebarPage color="brown" /></StorySection>
    </StoryPage>
  ),
}

export const Default: Story = { tags: ["verification"], render: () => <Page><Bar /></Page> }
export const Sticky: Story = { tags: ["verification"], render: () => <StickyPage /> }
export const Sidebar: Story = { tags: ["verification"], name: "GNB Sidebar", render: () => <SidebarPage fullHeight /> }
export const NavigationMenuOpen: Story = {
  tags: ["verification"],
  name: "Navigation Menu Open",
  render: () => (
    <div style={{ minHeight: 360 }}>
      <Page label="프로젝트 > 진행 중 프로젝트">
        <Bar initial="projects/active" openMenu="projects" />
      </Page>
    </div>
  ),
}
export const ShortDepthOpen: Story = {
  tags: ["verification"],
  render: () => <Page><Bar openMenu="admin" /></Page>,
}
export const RightEdgeLongDepth: Story = {
  tags: ["verification"],
  render: () => <Page><Bar openMenu="admin" items={navItems.map((item) => item.id === "admin" ? { ...item, children: navItems[1].children } : item)} /></Page>,
}

// First / middle / last parents, each with the same short / long 2Depth labels.
// Position and width remain Production GNB's; Stories only supply menu data.
const depthAlignmentItems = (long: boolean): NavItem[] => ["first", "middle", "last"].map((id, index) => ({
  id,
  label: ["첫 메뉴", "중간 메뉴", "마지막 메뉴"][index],
  children: long ? navItems[1].children : [{ id: `${id}/short`, label: "짧은 메뉴" }],
}))
const depthAlignmentRender = (openMenu: string, long: boolean) => () => <Page><Bar items={depthAlignmentItems(long)} openMenu={openMenu} /></Page>
export const FirstDepthShort: Story = { tags: ["verification"], render: depthAlignmentRender("first", false) }
export const FirstDepthLong: Story = { tags: ["verification"], render: depthAlignmentRender("first", true) }
export const MiddleDepthShort: Story = { tags: ["verification"], render: depthAlignmentRender("middle", false) }
export const MiddleDepthLong: Story = { tags: ["verification"], render: depthAlignmentRender("middle", true) }
export const LastDepthShort: Story = { tags: ["verification"], render: depthAlignmentRender("last", false) }
export const LastDepthLong: Story = { tags: ["verification"], render: depthAlignmentRender("last", true) }
export const EdgeFirstLong: Story = {
  tags: ["verification"],
  render: () => <div style={{ width: 600, maxWidth: "100%" }}><Page><Bar items={depthAlignmentItems(true)} openMenu="first" /></Page></div>,
}
export const EdgeLastLong: Story = {
  tags: ["verification"],
  render: () => <div style={{ width: 600, maxWidth: "100%", marginLeft: "auto" }}><Page><Bar items={depthAlignmentItems(true)} openMenu="last" /></Page></div>,
}
export const UserMenuOpen: Story = { tags: ["verification"], name: "User Menu Open", render: () => <Page><Bar userOpen /></Page> }
export const LongLabels: Story = {
  tags: ["verification"],
  name: "Long Labels",
  render: () => (
    <Page>
      <Bar items={longNavItems} person={longUser} eyebrow="한맥기술 인프라 통합 시스템" brand="스마트 시설물 통합 관리 시스템" />
    </Page>
  ),
}
export const WithLogo: Story = { tags: ["verification"], name: "With Logo", render: () => <Page><Bar logo={testLogo} /></Page> }
export const Utilities: Story = { tags: ["verification"], render: () => <Page><Bar utilities /></Page> }
// Mobile verification: use a 390px viewport (the switch is a viewport media query, so it cannot be shown inside a narrow container).
export const Mobile: Story = { tags: ["verification"], globals: { viewport: { value: "hmMobile390", isRotated: false } }, render: () => <Page><Bar initial="projects/active" utilities /></Page> }
export const MobileMenuOpen: Story = {
  tags: ["verification"],
  name: "Mobile Menu Open",
  globals: { viewport: { value: "hmMobile390", isRotated: false } },
  render: () => (
    <Page>
      <Bar initial="projects/active" mobileOpen />
    </Page>
  ),
}