Numbered accordion

"use client"

import * as React from "react"
import { ChevronDown } from "lucide-react"
import { AnimatePresence, motion, useReducedMotion } from "motion/react"

import { cn } from "@/lib/utils"

/* Numbered accordion family: 5 step-numbered accordions. Every row starts with
   a token step-number chip; the variants change the chip's shape and fill.
   Every export is a complete accordion: internal single-open state, a button
   header with aria-expanded, framer height auto animation. Colour comes ONLY
   from tokens. Alpha via color-mix. Under reduced-motion opening and closing are
   instant. Size = padding + text scale. Renders without props too. */

export type StyledSize = "sm" | "md" | "lg" | "xl"

export interface StyledAccordionItem {
  value: string
  title: React.ReactNode
  content: React.ReactNode
}

interface StyledAccordionProps {
  className?: string
  size?: StyledSize
  items?: StyledAccordionItem[]
  defaultOpen?: string
}

const headerPad: Record<StyledSize, string> = {
  sm: "px-3 py-2.5 text-sm",
  md: "px-4 py-3 text-sm",
  lg: "px-5 py-4 text-base",
  xl: "px-6 py-5 text-lg",
}

const bodyPad: Record<StyledSize, string> = {
  sm: "pl-11 pr-3 pb-2.5 text-sm",
  md: "pl-12 pr-4 pb-3 text-sm",
  lg: "pl-14 pr-5 pb-4 text-base",
  xl: "pl-16 pr-6 pb-5 text-base",
}

const iconSize: Record<StyledSize, string> = {
  sm: "size-4",
  md: "size-4",
  lg: "size-5",
  xl: "size-5",
}

const chipSize: Record<StyledSize, string> = {
  sm: "size-5 text-xs",
  md: "size-6 text-xs",
  lg: "size-7 text-sm",
  xl: "size-8 text-sm",
}

const defaultItems: StyledAccordionItem[] = [
  {
    value: "item-1",
    title: "What is included?",
    content:
      "Every plan ships the full component library, semantic tokens, and lifetime updates for the tier you own.",
  },
  {
    value: "item-2",
    title: "How does installation work?",
    content:
      "Add any component with a single CLI command. Files land in your project and stay fully editable.",
  },
  {
    value: "item-3",
    title: "Can I use it in production?",
    content:
      "Yes. The system is framework agnostic, self contained, and safe to ship to any number of projects.",
  },
]

function useSingleOpen(defaultOpen?: string) {
  const [open, setOpen] = React.useState<string | null>(defaultOpen ?? null)
  const toggle = React.useCallback(
    (value: string) => setOpen((cur) => (cur === value ? null : value)),
    []
  )
  return { open, toggle }
}

const headerBase =
  "flex w-full items-center gap-3 text-left font-medium outline-none transition-colors focus-visible:ring-[3px] focus-visible:ring-ring/50"

function Panel({
  isOpen,
  size,
  children,
}: {
  isOpen: boolean
  size: StyledSize
  children: React.ReactNode
}) {
  const reduce = useReducedMotion()
  return (
    <AnimatePresence initial={false}>
      {isOpen && (
        <motion.div
          key="panel"
          initial={reduce ? false : { height: 0, opacity: 0 }}
          animate={{ height: "auto", opacity: 1 }}
          exit={{ height: 0, opacity: 0 }}
          transition={
            reduce ? { duration: 0 } : { duration: 0.25, ease: [0.4, 0, 0.2, 1] }
          }
          className="overflow-hidden"
        >
          <div className={cn(bodyPad[size], "text-muted-foreground")}>
            {children}
          </div>
        </motion.div>
      )}
    </AnimatePresence>
  )
}

function Chevron({ isOpen, size }: { isOpen: boolean; size: StyledSize }) {
  const reduce = useReducedMotion()
  return (
    <motion.span
      aria-hidden
      className="ml-auto shrink-0 text-muted-foreground"
      animate={{ rotate: isOpen ? 180 : 0 }}
      transition={reduce ? { duration: 0 } : { duration: 0.2 }}
    >
      <ChevronDown className={iconSize[size]} />
    </motion.span>
  )
}

/* Shared numbered shell: one frame, rows divided by a token line, a step-number
   chip on each row. chipClass carries each variant's shape/fill technique. */
function NumberedShell({
  props,
  chipClass,
}: {
  props: StyledAccordionProps
  chipClass: string
}) {
  const { className, size = "md", items = defaultItems, defaultOpen } = props
  const { open, toggle } = useSingleOpen(defaultOpen)
  return (
    <div
      data-slot="styled-accordion"
      className={cn(
        "overflow-hidden rounded-xl border border-border bg-background",
        className
      )}
    >
      {items.map((item, i) => {
        const isOpen = open === item.value
        return (
          <div key={item.value} className={cn(i > 0 && "border-t border-border")}>
            <button
              type="button"
              aria-expanded={isOpen}
              onClick={() => toggle(item.value)}
              className={cn(
                headerBase,
                headerPad[size],
                "hover:bg-[color-mix(in_oklab,var(--color-foreground)_5%,transparent)]"
              )}
            >
              <span
                aria-hidden
                className={cn(
                  "inline-flex shrink-0 items-center justify-center font-semibold tabular-nums",
                  chipSize[size],
                  chipClass
                )}
              >
                {i + 1}
              </span>
              <span className="min-w-0">{item.title}</span>
              <Chevron isOpen={isOpen} size={size} />
            </button>
            <Panel isOpen={isOpen} size={size}>
              {item.content}
            </Panel>
          </div>
        )
      })}
    </div>
  )
}

/* Circle: yuvarlak yumusak-primary chip. */
export function CircleAccordion(props: StyledAccordionProps) {
  return (
    <NumberedShell
      props={props}
      chipClass="rounded-full bg-[color-mix(in_oklab,var(--color-primary)_15%,transparent)] text-primary"
    />
  )
}

/* Square: yuvarlatilmis kare yumusak-surface chip. */
export function SquareAccordion(props: StyledAccordionProps) {
  return (
    <NumberedShell
      props={props}
      chipClass="rounded-md bg-surface-2 text-foreground"
    />
  )
}

/* Outline: cizgili yuvarlak chip, seffaf dolgu. */
export function OutlineAccordion(props: StyledAccordionProps) {
  return (
    <NumberedShell
      props={props}
      chipClass="rounded-full border border-border text-muted-foreground"
    />
  )
}

/* Filled: dolu primary chip, ust-metin. */
export function FilledAccordion(props: StyledAccordionProps) {
  return (
    <NumberedShell
      props={props}
      chipClass="rounded-full bg-primary text-primary-foreground"
    />
  )
}

/* Ghost: no frame, only colored number text. */
export function GhostAccordion(props: StyledAccordionProps) {
  return (
    <NumberedShell props={props} chipClass="rounded-full text-primary" />
  )
}