import { useState, type ReactNode } from "react"
import type { Meta, StoryObj } from "@storybook/react-vite"
import { Combobox, Select, SelectContent, SelectItem, SelectTrigger, SelectValue, type ComboboxOption } from "@hm-design/ui"
import { StateBoard } from "@/components/story-board"
import { STORY_KICKER, StoryPage, StoryPageHeader, StorySection } from "@/components/story-page"

// Combobox is a Popover + Command composition (search + single choice); Select stays for short lists without search.
// The representative Story shows real comboboxes; the same specimens also exist as Stories tagged `verification` (hidden from the
// sidebar). The Label is Story composition.

const frameworks: ComboboxOption[] = [
  { value: "next", label: "Next.js" },
  { value: "sveltekit", label: "SvelteKit" },
  { value: "nuxt", label: "Nuxt" },
  { value: "remix", label: "Remix", disabled: true },
  { value: "astro", label: "Astro" },
]

const longOptions: ComboboxOption[] = [
  { value: "a", label: "긴 옵션 이름은 한 줄에서 말줄임으로 잘리고 trigger 폭을 넘지 않습니다. 끝까지 읽을 수 있어야 하면 폭을 넓히세요" },
  { value: "b", label: "짧은 옵션" },
]

function Field({ label, id, children }: { label: string; id: string; children: ReactNode }) {
  return (
    <div className="grid max-w-xs gap-2">
      <label htmlFor={id} className="justify-self-start text-sm font-medium text-muted-foreground">
        {label}
      </label>
      {children}
    </div>
  )
}

function Empty() {
  return (
    <Field label="프레임워크" id="cb-empty">
      <Combobox id="cb-empty" options={frameworks} placeholder="프레임워크 선택" searchPlaceholder="프레임워크 검색..." />
    </Field>
  )
}

function Controlled() {
  const [value, setValue] = useState("nuxt")
  return (
    <div className="grid gap-2">
      <Field label="선택됨 (controlled)" id="cb-controlled">
        <Combobox id="cb-controlled" controlled options={frameworks} value={value} onValueChange={setValue} />
      </Field>
      <span className="text-sm text-muted-foreground" data-testid="controlled">{`value = ${value}`}</span>
    </div>
  )
}

function Medium() {
  return (
    <Field label="Medium" id="cb-medium">
      <Combobox id="cb-medium" size="medium" options={frameworks} defaultValue="astro" />
    </Field>
  )
}

function LongLabel() {
  return (
    <Field label="긴 옵션" id="cb-long">
      <Combobox id="cb-long" options={longOptions} defaultValue="a" />
    </Field>
  )
}

function Disabled() {
  return (
    <Field label="비활성" id="cb-disabled">
      <Combobox id="cb-disabled" options={frameworks} defaultValue="next" disabled />
    </Field>
  )
}

function SelectComparison() {
  return (
    <div className="grid gap-6 sm:grid-cols-2">
      {(["medium", "large"] as const).map((size) => (
        <div key={size} className="grid content-start gap-3" data-comparison-size={size}>
          <Field label={`Select · ${size}`} id={`compare-select-${size}`}>
            <Select defaultValue="nuxt">
              <SelectTrigger id={`compare-select-${size}`} size={size} className="w-full"><SelectValue /></SelectTrigger>
              <SelectContent>
                {frameworks.map((option) => <SelectItem key={option.value} value={option.value} disabled={option.disabled}>{option.label}</SelectItem>)}
              </SelectContent>
            </Select>
          </Field>
          <Field label={`Combobox · ${size}`} id={`compare-combobox-${size}`}>
            <Combobox id={`compare-combobox-${size}`} size={size} options={frameworks} defaultValue="nuxt" />
          </Field>
        </div>
      ))}
    </div>
  )
}

const sections = [
  { id: "empty", label: "Empty placeholder + search (Remix is a disabled option)", node: <Empty /> },
  { id: "controlled", label: "Selected, controlled", node: <Controlled /> },
  { id: "medium", label: "Medium size", node: <Medium /> },
  { id: "long", label: "Long option", node: <LongLabel /> },
  { id: "disabled", label: "Disabled", node: <Disabled /> },
]

// No `component`: Combobox has a required `options` prop, so Stories without args would not type-check.
const meta = { title: "Components/Search & Date/Combobox", parameters: { layout: "padded" } } satisfies Meta
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: "Combobox",
  parameters: { layout: "fullscreen", controls: { disable: true } },
  render: () => (
    <StoryPage>
      <StoryPageHeader
        kicker={STORY_KICKER.components}
        title="Combobox"
        description="검색해서 하나를 고르는 Popover + Command 조합입니다. 검색이 필요 없는 짧은 목록은 Select를 씁니다."
      />
      <StorySection title="Overview" description="Trigger는 dialog 팝업을 열고, 내부 검색 입력이 listbox를 제어합니다. Enter/Space로 열기, 방향키·Enter로 선택, Escape로 닫기 후 Trigger로 focus가 복귀합니다.">{board("empty")}</StorySection>
      <StorySection title="Sizes" description="size를 생략하면 Large입니다. 같은 size의 Select와 나란히 비교합니다.">
        <StateBoard
          min={320}
          states={[
            ...sections.filter((s) => s.id === "medium").map((s) => ({ id: s.id, label: s.label, children: s.node })),
            { id: "select-comparison", label: "Select / Combobox visual comparison", wide: true, children: <SelectComparison /> },
          ]}
        />
      </StorySection>
      <StorySection title="States">{board("controlled", "disabled")}</StorySection>
      <StorySection title="Usage">{board("long")}</StorySection>
    </StoryPage>
  ),
}

export const EmptyCombobox: Story = { tags: ["verification"], name: "Empty", render: () => <Empty /> }
export const ControlledCombobox: Story = { tags: ["verification"], name: "Controlled", render: () => <Controlled /> }
export const LongOption: Story = { tags: ["verification"], name: "Long Option", render: () => <LongLabel /> }

export const OpenBottom: Story = {
  tags: ["verification"],
  render: () => <div style={{ width: 280, maxWidth: "100%", minHeight: "calc(100dvh - 32px)" }}><Controlled /></div>,
}
export const OpenTop: Story = {
  tags: ["verification"],
  render: () => <div style={{ width: 280, maxWidth: "100%", minHeight: "calc(100dvh - 32px)", display: "grid", alignItems: "end" }}><Controlled /></div>,
}