import type { Meta, StoryObj } from "@storybook/react-vite"
import { Card, CardContent, CardHeader, Skeleton } from "@hm-design/ui"
import { StateBoard } from "@/components/story-board"
import { StoryPage, StoryPageHeader, StorySection } from "@/components/story-page"

// Skeleton is a visual placeholder; size and shape come from `className` (layout classes here are Story composition).
// There is no data fetching. The representative Story shows text lines, an avatar, and a card / list loading composition.

function TextLines() {
  return (
    <div className="grid gap-2">
      <Skeleton className="h-4 w-3/4" />
      <Skeleton className="h-4 w-full" />
      <Skeleton className="h-4 w-1/2" />
    </div>
  )
}

function AvatarRow() {
  return (
    <div className="flex items-center gap-3">
      <Skeleton className="size-10 rounded-full" />
      <div className="grid flex-1 gap-2">
        <Skeleton className="h-4 w-1/3" />
        <Skeleton className="h-3 w-2/3" />
      </div>
    </div>
  )
}

function CardLoading() {
  return (
    <Card>
      <CardHeader>
        <Skeleton className="h-5 w-1/2" />
      </CardHeader>
      <CardContent className="grid gap-3">
        <Skeleton className="h-24 w-full" />
        <AvatarRow />
        <AvatarRow />
      </CardContent>
    </Card>
  )
}

const sections = [
  { id: "text", label: "Text", node: <TextLines /> },
  { id: "avatar", label: "Avatar + text", node: <AvatarRow /> },
  { id: "card", label: "Card / list loading", node: <CardLoading /> },
]

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

// Representative-page layout (Storybook presentation only): 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 every subtitle and divider
// has the width of its column; a section with fewer specimens than columns leaves the remaining columns empty.
const specimenColumns = {
  2: "min-[1000px]:grid-cols-2",
  3: "min-[1000px]:grid-cols-3",
  4: "min-[1000px]:grid-cols-4",
} as const

function SpecimenGrid({ ids, columns, spans = {} }: { ids: string[]; columns: 2 | 3 | 4; spans?: Record<string, 2> }) {
  return (
    <div className={`grid items-start gap-6 [grid-template-columns:repeat(auto-fill,minmax(min(100%,240px),1fr))] ${specimenColumns[columns]}`}>
      {ids.map((id) => {
        const s = sections.find((section) => section.id === id)!
        return (
          <div key={id} className={spans[id] ? "min-[1000px]:col-span-2" : undefined}>
            <StateBoard min={10000} states={[{ id: s.id, label: s.label, children: s.node }]} />
          </div>
        )
      })}
    </div>
  )
}

// Representative Story: the common Story page; the sections group the same specimens.
// Representative Story: Overview / Usage are merged into one Variants section (Text, Avatar + text, Card / list loading). 3 columns on PC.
export const All: Story = {
  name: "Skeleton",
  parameters: { layout: "fullscreen", controls: { disable: true } },
  render: () => (
    <StoryPage>
      <StoryPageHeader title="Skeleton" />
      <StorySection title="Variants">
        <SpecimenGrid ids={["text", "avatar", "card"]} columns={3} />
      </StorySection>
    </StoryPage>
  ),
}

export const Text: Story = { tags: ["verification"], render: () => <TextLines /> }
export const CardList: Story = { tags: ["verification"], name: "Card List", render: () => <CardLoading /> }