# All files / src/components/ui accordion.tsx

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     import React, { ComponentProps, forwardRef, useState, createContext, useContext } from "react"
    import { cn } from "@/lib/utils"
    import { CaretDown } from "@phosphor-icons/react"

    interface AccordionContextValue {
      openItems: Set<string>
      toggleItem: (value: string) => void
      type: "single" | "multiple"
    }

    const AccordionContext = createContext<AccordionContextValue | null>(null)

    interface AccordionProps extends ComponentProps<"div"> {
      type?: "single" | "multiple"
      defaultValue?: string | string[]
    }

    export function Accordion({
      type = "single",
      defaultValue,
      children,
      className,
      ...props
    }: AccordionProps) {
      const [openItems, setOpenItems] = useState<Set<string>>(() => {
        if (!defaultValue) return new Set()
        return new Set(Array.isArray(defaultValue) ? defaultValue : [defaultValue])
      })

      const toggleItem = (value: string) => {
        setOpenItems(prev => {
          const next = new Set(prev)
          if (next.has(value)) {
            next.delete(value)
          } else {
            if (type === "single") {
              next.clear()
            }
            next.add(value)
          }
          return next
        })
      }

      return (
        <AccordionContext.Provider value={{ openItems, toggleItem, type }}>
          <div className={cn("mat-accordion", className)} {...props}>
            {children}
          </div>
        </AccordionContext.Provider>
      )
    }

    export const AccordionItem = forwardRef<HTMLDivElement, ComponentProps<"div"> & { value: string }>(
      ({ className, value, children, ...props }, ref) => {
        const context = useContext(AccordionContext)
        const isExpanded = context?.openItems.has(value)

        return (
          <div
            ref={ref}
            className={cn(
              "mat-expansion-panel",
              isExpanded && "mat-expanded",
              className
            )}
            data-value={value}
            {...props}
          >
            {children}
          </div>
        )
      }
    )
    AccordionItem.displayName = "AccordionItem"

    export const AccordionTrigger = forwardRef<HTMLButtonElement, ComponentProps<"button">>(
      ({ className, children, ...props }, ref) => {
        const context = useContext(AccordionContext)
        const [value, setValue] = React.useState("")

        React.useEffect(() => {
          if (!ref || typeof ref === "function") return
          const item = ref.current?.closest("[data-value]")
          setValue(item?.getAttribute("data-value") || "")
        }, [ref])

        return (
          <button
            ref={ref}
            className={cn("mat-expansion-panel-header", className)}
            onClick={() => context?.toggleItem(value)}
            {...props}
          >
            <span className="mat-content">
              <span className="mat-expansion-panel-header-title">{children}</span>
            </span>
            <span className="mat-expansion-indicator">
              <CaretDown />
            </span>
          </button>
        )
      }
    )
    AccordionTrigger.displayName = "AccordionTrigger"

    export const AccordionContent = forwardRef<HTMLDivElement, ComponentProps<"div">>(
      ({ className, children, ...props }, ref) => {
        const context = useContext(AccordionContext)
        const [value, setValue] = React.useState("")
        const isExpanded = context?.openItems.has(value)

        React.useEffect(() => {
          if (!ref || typeof ref === "function") return
          const item = ref.current?.closest("[data-value]")
          setValue(item?.getAttribute("data-value") || "")
        }, [ref])

        if (!isExpanded) return null

        return (
          <div className="mat-expansion-panel-content">
            <div
              ref={ref}
              className={cn("mat-expansion-panel-body", className)}
              {...props}
            >
              {children}
            </div>
          </div>
        )
      }
    )
    AccordionContent.displayName = "AccordionContent"