import { useState, type ReactNode } from "react"
import type { Meta, StoryObj } from "@storybook/react-vite"
import { Slider } from "@hm-design/ui"
import { StateBoard } from "@/components/story-board"
import { STORY_KICKER, StoryPage, StoryPageHeader, StorySection } from "@/components/story-page"

// The representative Story shows each Slider mode with real, draggable controls; the same specimens also exist as Stories tagged
// `verification` (hidden from the sidebar). The value label is the Story's composition (Slider has no built-in label).
// Names (`aria-label`) are provided by the consumer.

function Labeled({ label, children, valueText }: { label: string; children: ReactNode; valueText: string }) {
  return (
    <div className="grid gap-3">
      <div className="flex justify-between text-sm">
        <span className="font-medium">{label}</span>
        <span className="text-muted-foreground" data-testid="value">{valueText}</span>
      </div>
      {children}
    </div>
  )
}

function Single() {
  const [value, setValue] = useState([40])
  return (
    <Labeled label="볼륨" valueText={`${value[0]}`}>
      <Slider aria-label="볼륨" value={value} onValueChange={setValue} max={100} step={1} />
    </Labeled>
  )
}

function Range() {
  const [value, setValue] = useState([25, 75])
  return (
    <Labeled label="가격 범위" valueText={`${value[0]} – ${value[1]}`}>
      <Slider aria-label="가격 범위" value={value} onValueChange={setValue} max={100} step={1} minStepsBetweenThumbs={5} />
    </Labeled>
  )
}

function Step() {
  const [value, setValue] = useState([50])
  return (
    <Labeled label="단계 (step 25)" valueText={`${value[0]}`}>
      <Slider aria-label="단계" value={value} onValueChange={setValue} max={100} step={25} />
    </Labeled>
  )
}

function Disabled() {
  return <Slider aria-label="비활성" defaultValue={[60]} disabled />
}

function Vertical() {
  return (
    <div style={{ height: 180 }} className="flex justify-center">
      <Slider aria-label="세로" defaultValue={[30]} orientation="vertical" />
    </div>
  )
}

const sections = [
  { id: "single", label: "Single", node: <Single /> },
  { id: "range", label: "Range (two thumbs)", node: <Range /> },
  { id: "step", label: "Step", node: <Step /> },
  { id: "disabled", label: "Disabled", node: <Disabled /> },
  { id: "vertical", label: "Vertical", node: <Vertical /> },
]

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

const board = (...ids: string[]) => (
  <StateBoard min={320} states={sections.filter((s) => ids.includes(s.id)).map((s) => ({ id: s.id, label: s.label, children: s.node }))} />
)

// Representative Story: the common Story page; the sections group the same specimens.
export const All: Story = {
  name: "Slider",
  parameters: { layout: "fullscreen", controls: { disable: true } },
  render: () => (
    <StoryPage>
      <StoryPageHeader
        kicker={STORY_KICKER.components}
        title="Slider"
        description="막대 위의 thumb을 끌어 범위 안의 값을 고르는 컨트롤입니다. 화살표 키로도 값을 바꿉니다."
      />
      <StorySection title="Overview">{board("single")}</StorySection>
      <StorySection title="Variants" description="두 thumb의 범위, step, 세로 방향입니다.">{board("range", "step", "vertical")}</StorySection>
      <StorySection title="States">{board("disabled")}</StorySection>
    </StoryPage>
  ),
}

export const SingleValue: Story = { tags: ["verification"], name: "Single", render: () => <Single /> }
export const RangeValue: Story = { tags: ["verification"], name: "Range", render: () => <Range /> }
export const DisabledSlider: Story = { tags: ["verification"], name: "Disabled", render: () => <Disabled /> }

export const Focus: Story = {
  tags: ["verification"],
  render: () => (
    <div className="grid gap-8">
      <Single />
      <Labeled label="비활성" valueText="60"><Disabled /></Labeled>
      <output data-testid="slider-focus-result" hidden>Ready</output>
    </div>
  ),
  play: async ({ canvasElement }) => {
    const thumb = canvasElement.querySelector<HTMLElement>('[data-slot="slider-thumb"]')!
    const disabled = canvasElement.querySelector<HTMLElement>('[data-disabled] [data-slot="slider-thumb"]')!
    const result = canvasElement.querySelector<HTMLOutputElement>('[data-testid="slider-focus-result"]')!
    const states: Record<string, string> = {}
    const read = (name: string, element = thumb) => { states[name] = getComputedStyle(element).boxShadow }
    const assert = (condition: boolean, message: string) => { if (!condition) throw Error(message) }
    thumb.blur()
    read("Default")
    // Existing Storybook pseudo-state mirroring preserves production selector order/specificity.
    thumb.setAttribute("data-sb-hover", "")
    read("Hover")
    thumb.setAttribute("data-sb-active", "")
    read("Drag")
    thumb.removeAttribute("data-sb-hover")
    thumb.removeAttribute("data-sb-active")
    thumb.focus()
    assert(thumb.matches(":focus-visible"), "Keyboard focus must be visible")
    read("Focus")
    thumb.setAttribute("data-sb-hover", "")
    read("Focus + Hover")
    thumb.setAttribute("data-sb-active", "")
    read("Focus + Drag")
    disabled.setAttribute("data-sb-hover", "")
    disabled.setAttribute("data-sb-active", "")
    disabled.focus()
    read("Disabled", disabled)
    assert(document.activeElement !== disabled, "Disabled thumb cannot receive focus")
    assert(states.Default === "none" && states.Disabled === "none", "Default/Disabled have no halo")
    assert(states.Hover.includes("4px") && states.Drag === states.Hover.replace("4px", "6px"), "Interaction keeps 4/6px and its color")
    assert(states.Focus.includes("4px") && states["Focus + Hover"] === states.Focus, "Hover cannot mask Focus")
    assert(states["Focus + Drag"] === states.Focus.replace("4px", "6px"), "Drag keeps 6px without masking Focus color")
    for (const element of [thumb, disabled]) {
      element.removeAttribute("data-sb-hover")
      element.removeAttribute("data-sb-active")
    }
    thumb.focus()
    result.textContent = JSON.stringify(states)
  },
}