Accordion

"use client";

import * as React from "react";
import * as AccordionPrimitive from "@radix-ui/react-accordion";

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

// The brand's questions (faq.tsx, globals.css details[open] > .faq-answer; computed): rows on 9 percent ink rules, each
// question in 16px Inter at 20px by 16px, a drawn + at the right (two 1px bars in a 14px box, 64 percent ink). Under the
// pointer, and while open, a row takes the pale blue on a card drawn 3px inside its edges (6px corners), and the rules on
// both its edges step aside so the card never sits between lines; the color eases in 200ms. Open, the + turns an eighth
// into an x and goes blue (200ms ease-out), and the answer (15px Inter at 64 percent ink, 576px wide) slides open and
// fades up 4px into place. Reduced motion opens it at once. Pull the list out by its padding (-mx-4) so the text lines
// up with the column.
function Accordion(props: React.ComponentProps<typeof AccordionPrimitive.Root>) {
  return <AccordionPrimitive.Root data-slot="accordion" {...props} />;
}

function AccordionItem({ className, ...props }: React.ComponentProps<typeof AccordionPrimitive.Item>) {
  return <AccordionPrimitive.Item data-slot="accordion-item" className={cn(
        "relative isolate border-b border-line px-4 before:absolute before:inset-x-0 before:inset-y-0.75 before:-z-10 before:rounded-card before:transition-[background-color] before:duration-200 before:ease-out last:border-b-0 hover:border-b-transparent hover:before:bg-blue-5 data-[state=open]:border-b-transparent data-[state=open]:before:bg-blue-5 motion-reduce:before:transition-none [&:has(+:hover)]:border-b-transparent [&:has(+[data-state=open])]:border-b-transparent",
        className,
      )} {...props} />;
}

/** The question's mark: a 14px plus drawn in two 1px bars. */
function AccordionMark({ className }: { className?: string }) {
  return (
    <span aria-hidden data-slot="accordion-mark" className={cn("relative size-3.5 shrink-0 text-fg-muted transition-[rotate,color] duration-200 ease-out motion-reduce:transition-[color]", className)}>
      <span className="absolute top-1/2 left-0 h-px w-3.5 -translate-y-1/2 bg-current" />
      <span className="absolute top-0 left-1/2 h-3.5 w-px -translate-x-1/2 bg-current" />
    </span>
  );
}

function AccordionTrigger({ className, children, icon, ...props }: React.ComponentProps<typeof AccordionPrimitive.Trigger> & { icon?: React.ReactNode | null }) {
  return (
    <AccordionPrimitive.Header className="flex">
      <AccordionPrimitive.Trigger
        data-slot="accordion-trigger"
        className={cn(
          "group flex flex-1 cursor-pointer items-center justify-between gap-6 py-5 text-left font-sans text-body leading-body text-fg outline-none focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-solid focus-visible:outline-focus-ring disabled:pointer-events-none disabled:opacity-50",
          className,
        )}
        {...props}
      >
        {children}
        {icon === undefined ? <AccordionMark className="group-data-[state=open]:rotate-45 group-data-[state=open]:text-fg-brand" /> : icon}
      </AccordionPrimitive.Trigger>
    </AccordionPrimitive.Header>
  );
}

function AccordionContent({ className, children, ...props }: React.ComponentProps<typeof AccordionPrimitive.Content>) {
  return (
    <AccordionPrimitive.Content
      data-slot="accordion-content"
      className="overflow-hidden text-button leading-relaxed text-fg-muted motion-safe:data-[state=closed]:animate-accordion-up data-[state=closed]:[animation-duration:var(--ds-duration-base)] motion-safe:data-[state=open]:animate-accordion-down motion-reduce:animate-none"
      {...props}
    >
      <div className={cn("max-w-xl pb-6 transition-[opacity,translate] duration-200 ease-out starting:-translate-y-1 starting:opacity-0 motion-reduce:transition-[opacity]", className)}>{children}</div>
    </AccordionPrimitive.Content>
  );
}

export { Accordion, AccordionContent, AccordionItem, AccordionMark, AccordionTrigger };