Accent 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"

/* Accent accordion family: 5 left-bar accordions. When a row opens, a primary
   bar on the left edge grows or glows; the variants change how the bar behaves.
   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 the bar appears
   instantly instead of transforming and the panel opens instantly. 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: "px-3 pb-2.5 text-sm",
  md: "px-4 pb-3 text-sm",
  lg: "px-5 pb-4 text-base",
  xl: "px-6 pb-5 text-base",
}

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

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 justify-between 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="shrink-0 text-muted-foreground"
      animate={{ rotate: isOpen ? 180 : 0 }}
      transition={reduce ? { duration: 0 } : { duration: 0.2 }}
    >
      <ChevronDown className={iconSize[size]} />
    </motion.span>
  )
}

interface BarStyle {
  /* the width of the bar */
  width: string
  /* acikken satira uygulanan ek arka plan */
  openBg?: string
  /* acikken bar'a uygulanan ek his (or. glow) */
  openBar?: string
  /* origin: dikey buyume mi yoksa yatay kayma mi */
  mode: "grow" | "slide" | "fade"
}

/* Shared accent shell: an animated primary bar on the left of every row. The
   bar grows, slides or glows on open and returns on close. barStyle is each
   variant's behaviour. */
function AccentShell({
  props,
  barStyle,
}: {
  props: StyledAccordionProps
  barStyle: BarStyle
}) {
  const { className, size = "md", items = defaultItems, defaultOpen } = props
  const { open, toggle } = useSingleOpen(defaultOpen)
  const reduce = useReducedMotion()
  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
        const barAnim =
          barStyle.mode === "grow"
            ? { scaleY: isOpen ? 1 : 0 }
            : barStyle.mode === "slide"
              ? { x: isOpen ? 0 : -4, opacity: isOpen ? 1 : 0 }
              : { opacity: isOpen ? 1 : 0 }
        return (
          <div
            key={item.value}
            className={cn(
              "relative transition-colors",
              i > 0 && "border-t border-border",
              isOpen && barStyle.openBg
            )}
          >
            <motion.span
              aria-hidden
              className={cn(
                "absolute left-0 top-0 bottom-0 origin-top rounded-full bg-primary",
                barStyle.width,
                isOpen && barStyle.openBar
              )}
              initial={false}
              animate={reduce ? { opacity: isOpen ? 1 : 0 } : barAnim}
              transition={
                reduce
                  ? { duration: 0 }
                  : { type: "spring" as const, stiffness: 320, damping: 30 }
              }
            />
            <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)]"
              )}
            >
              {item.title}
              <Chevron isOpen={isOpen} size={size} />
            </button>
            <Panel isOpen={isOpen} size={size}>
              {item.content}
            </Panel>
          </div>
        )
      })}
    </div>
  )
}

/* Bar: klasik ince sol bar, acikken dikey buyur. */
export function BarAccordion(props: StyledAccordionProps) {
  return <AccentShell props={props} barStyle={{ width: "w-1", mode: "grow" }} />
}

/* Grow: a thicker bar, growing vertically when open plus a soft row fill. */
export function GrowAccordion(props: StyledAccordionProps) {
  return (
    <AccentShell
      props={props}
      barStyle={{
        width: "w-1.5",
        mode: "grow",
        openBg: "bg-[color-mix(in_oklab,var(--color-primary)_8%,transparent)]",
      }}
    />
  )
}

/* Glow: bar acikken parlar (primary tonlu golge). */
export function GlowAccordion(props: StyledAccordionProps) {
  return (
    <AccentShell
      props={props}
      barStyle={{
        width: "w-1",
        mode: "grow",
        openBar:
          "shadow-[0_0_10px_2px_color-mix(in_oklab,var(--color-primary)_55%,transparent)]",
      }}
    />
  )
}

/* Left: bar soldan kayarak girer (slide-in). */
export function LeftAccordion(props: StyledAccordionProps) {
  return <AccentShell props={props} barStyle={{ width: "w-1", mode: "slide" }} />
}

/* Full: a thick bar appearing with a fade plus a pronounced row fill. */
export function FullAccordion(props: StyledAccordionProps) {
  return (
    <AccentShell
      props={props}
      barStyle={{
        width: "w-2",
        mode: "fade",
        openBg: "bg-[color-mix(in_oklab,var(--color-primary)_12%,transparent)]",
      }}
    />
  )
}