import { Fragment, type ReactNode } from "react"
import type { Meta, StoryObj } from "@storybook/react-vite"
import {
  Breadcrumb,
  BreadcrumbEllipsis,
  BreadcrumbItem,
  BreadcrumbLink,
  BreadcrumbList,
  BreadcrumbPage,
  BreadcrumbSeparator,
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from "@hm-design/ui"
import { StateBoard, type BoardState } from "@/components/story-board"
import { StoryPage, StoryPageHeader, StorySection } from "@/components/story-page"

// The representative "Breadcrumb" Story shows each case on one page (real links with sample hrefs); the same specimens also exist
// as Stories tagged `verification` (hidden from the sidebar). BreadcrumbEllipsis is presentational: the Dropdown Menu example is
// a consumer composition, not part of Breadcrumb.

const narrow = (children: ReactNode) => <div className="w-full max-w-xl">{children}</div>

function Basic() {
  return (
    <Breadcrumb>
      <BreadcrumbList>
        <BreadcrumbItem>
          <BreadcrumbLink href="#home">홈</BreadcrumbLink>
        </BreadcrumbItem>
        <BreadcrumbSeparator />
        <BreadcrumbItem>
          <BreadcrumbLink href="#users">사용자</BreadcrumbLink>
        </BreadcrumbItem>
        <BreadcrumbSeparator />
        <BreadcrumbItem>
          <BreadcrumbPage>상세</BreadcrumbPage>
        </BreadcrumbItem>
      </BreadcrumbList>
    </Breadcrumb>
  )
}

function Ellipsis() {
  return (
    <Breadcrumb>
      <BreadcrumbList>
        <BreadcrumbItem>
          <BreadcrumbLink href="#home">홈</BreadcrumbLink>
        </BreadcrumbItem>
        <BreadcrumbSeparator />
        <BreadcrumbItem>
          <DropdownMenu>
            <DropdownMenuTrigger aria-label="중간 경로 보기">
              <BreadcrumbEllipsis />
            </DropdownMenuTrigger>
            <DropdownMenuContent align="start">
              <DropdownMenuItem>문서</DropdownMenuItem>
              <DropdownMenuItem>설정</DropdownMenuItem>
            </DropdownMenuContent>
          </DropdownMenu>
        </BreadcrumbItem>
        <BreadcrumbSeparator />
        <BreadcrumbItem>
          <BreadcrumbLink href="#project">프로젝트</BreadcrumbLink>
        </BreadcrumbItem>
        <BreadcrumbSeparator />
        <BreadcrumbItem>
          <BreadcrumbPage>상세</BreadcrumbPage>
        </BreadcrumbItem>
      </BreadcrumbList>
    </Breadcrumb>
  )
}

function Long() {
  const labels = ["홈", "프로젝트", "한맥 프로젝트 관리 시스템", "노선 정보", "시설물 목록", "교량", "상세 정보 및 점검 이력"]
  return (
    <Breadcrumb>
      <BreadcrumbList>
        {labels.map((label, i) => (
          <Fragment key={label}>
            <BreadcrumbItem>
              {i === labels.length - 1 ? <BreadcrumbPage>{label}</BreadcrumbPage> : <BreadcrumbLink href={`#${i}`}>{label}</BreadcrumbLink>}
            </BreadcrumbItem>
            {i < labels.length - 1 ? <BreadcrumbSeparator /> : null}
          </Fragment>
        ))}
      </BreadcrumbList>
    </Breadcrumb>
  )
}

// asChild: the link is any element (here a plain <a> standing in for a router Link) and keeps the Breadcrumb look.
function CustomLink() {
  return (
    <Breadcrumb>
      <BreadcrumbList>
        <BreadcrumbItem>
          <BreadcrumbLink asChild>
            <a href="#router-home">홈 (custom link)</a>
          </BreadcrumbLink>
        </BreadcrumbItem>
        <BreadcrumbSeparator>/</BreadcrumbSeparator>
        <BreadcrumbItem>
          <BreadcrumbPage>현재 페이지</BreadcrumbPage>
        </BreadcrumbItem>
      </BreadcrumbList>
    </Breadcrumb>
  )
}

const sections = [
  { id: "basic", label: "Basic", node: <Basic /> },
  { id: "ellipsis", label: "Ellipsis", node: <Ellipsis /> },
  { id: "long", label: "Long path", node: <Long /> },
  { id: "custom", label: "Custom link · separator", node: <CustomLink /> },
]

const meta = { title: "Components/Navigation/Breadcrumb", component: Breadcrumb, parameters: { layout: "padded" } } satisfies Meta<typeof Breadcrumb>
export default meta
type Story = StoryObj<typeof meta>

// Representative-page layout (Storybook presentation only): Variants use 3 equal columns on PC (iframe width 1000px and up),
// fewer below that (240px minimum). Each specimen sits in its own single-column StateBoard (min larger than any column), so
// StateBoard's auto-fill grid cannot leave an empty or stretched track.
const specimen = (id: string, children?: ReactNode): BoardState => {
  const s = sections.find((section) => section.id === id)!
  return { id: s.id, label: s.label, children: children ?? narrow(s.node) }
}

// Representative Story: the common Story page; the sections group the same specimens.
// Overview is merged into Variants (Basic is its first item). The Long path example gets up to 900px so it fits on one line on
// PC; BreadcrumbList is `flex-wrap`, so it wraps naturally (never clipped or forced nowrap) when the space is narrower.
export const All: Story = {
  name: "Breadcrumb",
  parameters: { layout: "fullscreen", controls: { disable: true } },
  render: () => (
    <StoryPage>
      <StoryPageHeader title="Breadcrumb" />
      <StorySection title="Variants">
        <div className="grid items-start gap-6 [grid-template-columns:repeat(auto-fill,minmax(min(100%,240px),1fr))] min-[1000px]:grid-cols-3">
          {["basic", "ellipsis", "custom"].map((id) => (
            <StateBoard key={id} min={10000} states={[specimen(id)]} />
          ))}
        </div>
      </StorySection>
      <StorySection title="Usage">
        <StateBoard min={10000} states={[specimen("long", <div className="w-full max-w-[900px]">{sections.find((s) => s.id === "long")!.node}</div>)]} />
      </StorySection>
    </StoryPage>
  ),
}

export const Basic3: Story = { tags: ["verification"], name: "Basic", render: () => <Basic /> }
export const WithEllipsis: Story = { tags: ["verification"], name: "Ellipsis", render: () => <Ellipsis /> }
export const LongPath: Story = { tags: ["verification"], name: "Long Path", render: () => narrow(<Long />) }