Centered navbar

'use client'

import { useState } from 'react'
import Link from 'next/link'
import { Menu, X } from 'lucide-react'
import { BrandMark } from '@/components/library/brand'
import { ButtonLink } from '@/components/ui/button'
import { productLinks, companyLinks } from '@/content/nav-demo'

/**
 * Centered navbar
 *
 * Links sit in the optical centre with the brand on the left and actions on
 * the right. The three regions are equal-width grid tracks, which is what
 * keeps the centre truly centred regardless of how long the wordmark or the
 * action labels are.
 */
export default function CenteredNavbar() {
  const [open, setOpen] = useState(false)
  const links = [...productLinks.slice(0, 3), ...companyLinks.slice(0, 1)]

  return (
    <div className="w-full border-b border-line bg-surface">
      <div className="mx-auto grid h-16 w-full max-w-6xl grid-cols-[1fr_auto_1fr] items-center gap-4 px-4 sm:px-6">
        <Link href="/" className="flex items-center gap-2 justify-self-start text-ink-strong">
          <BrandMark className="size-5 text-accent" />
          <span className="display-type text-md font-semibold">Foundry</span>
        </Link>

        <nav aria-label="Centered example" className="hidden lg:block">
          <ul className="flex items-center gap-1">
            {links.map((link) => (
              <li key={link.href}>
                <Link
                  href={link.href}
                  className="flex h-8 items-center rounded-md px-3 text-sm font-medium text-ink-muted transition-colors hover:bg-surface-sunken hover:text-ink"
                >
                  {link.label}
                </Link>
              </li>
            ))}
          </ul>
        </nav>

        <div className="col-start-3 flex items-center justify-self-end">
          <div className="hidden items-center gap-2 lg:flex">
            <ButtonLink href="/search" variant="ghost" size="sm">
              Search
            </ButtonLink>
            <ButtonLink href="/docs/getting-started" size="sm">
              Get started
            </ButtonLink>
          </div>
          <button
            type="button"
            onClick={() => setOpen((value) => !value)}
            aria-expanded={open}
            aria-controls="centered-nav-panel"
            className="flex size-9 items-center justify-center rounded-md text-ink-muted hover:bg-surface-sunken lg:hidden"
          >
            {open ? (
              <X className="size-5" aria-hidden="true" />
            ) : (
              <Menu className="size-5" aria-hidden="true" />
            )}
            <span className="sr-only">{open ? 'Close navigation' : 'Open navigation'}</span>
          </button>
        </div>
      </div>

      <div id="centered-nav-panel" hidden={!open} className="border-t border-line-subtle lg:hidden">
        <nav aria-label="Centered example, mobile" className="flex flex-col gap-3 px-4 py-4">
          <ul className="flex flex-col gap-0.5">
            {links.map((link) => (
              <li key={link.href}>
                <Link
                  href={link.href}
                  className="flex min-h-11 items-center rounded-md px-3 text-sm text-ink hover:bg-surface-sunken"
                >
                  {link.label}
                </Link>
              </li>
            ))}
          </ul>
          <div className="flex gap-2">
            <ButtonLink href="/search" variant="outline" size="sm" block>
              Search
            </ButtonLink>
            <ButtonLink href="/docs/getting-started" size="sm" block>
              Get started
            </ButtonLink>
          </div>
        </nav>
      </div>
    </div>
  )
}

import type { ButtonHTMLAttributes, ReactNode } from 'react'
import Link from 'next/link'
import { cn } from '@/lib/cn'
import { variants } from '@/lib/variants'
import { Spinner } from './spinner'

/**
 * Button
 *
 * The whole action surface of Foundry in one component. It is intentionally a
 * *shared* component (no `'use client'`): rendered from a Server Component it
 * ships zero JavaScript, and it upgrades to a client island automatically when
 * a Client Component imports it.
 *
 * Height, padding and radius resolve from density and radius tokens, so a
 * button restyles itself when the density or palette axis changes. Focus is
 * handled once, globally, by the `:focus-visible` rule in `globals.css`.
 */
const buttonVariants = variants(
  cn(
    'relative inline-flex items-center justify-center gap-2 whitespace-nowrap font-medium',
    'transition-colors duration-150 ease-standard select-none',
    'disabled:pointer-events-none disabled:opacity-50',
    'aria-disabled:pointer-events-none aria-disabled:opacity-50',
  ),
  {
    variants: {
      variant: {
        primary: 'bg-accent text-accent-ink hover:bg-accent-hover active:bg-accent-active',
        secondary: 'bg-surface-inverse text-ink-inverse hover:opacity-90 active:opacity-80',
        outline: 'border border-line-strong bg-surface text-ink hover:bg-surface-sunken',
        ghost: 'text-ink hover:bg-surface-sunken active:bg-surface-sunken',
        destructive: 'bg-danger text-white hover:opacity-90 active:opacity-80',
        success: 'bg-success text-white hover:opacity-90 active:opacity-80',
        warning: 'bg-warning text-white hover:opacity-90 active:opacity-80',
        link: 'text-accent underline underline-offset-4 hover:text-accent-hover',
        soft: 'bg-accent-soft text-accent-soft-ink border border-accent-line hover:brightness-[0.97]',
      },
      size: {
        sm: 'h-control-sm px-3 text-xs rounded-md',
        md: 'h-control px-[var(--density-control-padding-x)] text-sm rounded-md',
        lg: 'h-control-lg px-5 text-base rounded-md',
        icon: 'h-control w-control p-0 rounded-md',
        'icon-sm': 'h-control-sm w-control-sm p-0 rounded-sm',
      },
      block: { true: 'w-full', false: '' },
    },
    defaultVariants: { variant: 'primary', size: 'md', block: false },
    compound: [
      { variant: 'link', size: 'sm', class: 'h-auto px-0' },
      { variant: 'link', size: 'md', class: 'h-auto px-0' },
      { variant: 'link', size: 'lg', class: 'h-auto px-0' },
    ],
  },
)

export type ButtonVariant =
  | 'primary'
  | 'secondary'
  | 'outline'
  | 'ghost'
  | 'destructive'
  | 'success'
  | 'warning'
  | 'link'
  | 'soft'

export type ButtonSize = 'sm' | 'md' | 'lg' | 'icon' | 'icon-sm'

export interface ButtonProps extends ButtonHTMLAttributes<HTMLButtonElement> {
  variant?: ButtonVariant
  size?: ButtonSize
  block?: boolean
  /** Swaps content for a spinner while preserving the button's measured width. */
  loading?: boolean
  /** Announced by assistive tech while `loading` is true. */
  loadingLabel?: string
  leadingIcon?: ReactNode
  trailingIcon?: ReactNode
}

export function Button({
  variant = 'primary',
  size = 'md',
  block = false,
  loading = false,
  loadingLabel = 'Working',
  leadingIcon,
  trailingIcon,
  className,
  children,
  disabled,
  type = 'button',
  ...props
}: ButtonProps) {
  return (
    <button
      type={type}
      className={buttonVariants({ variant, size, block, className })}
      disabled={disabled ?? loading}
      aria-busy={loading || undefined}
      {...props}
    >
      {loading ? (
        <>
          {/* Label stays in the DOM but hidden so the control never collapses
              to spinner width halfway through an interaction. */}
          <span className="invisible flex items-center gap-2" aria-hidden="true">
            {leadingIcon}
            {children}
            {trailingIcon}
          </span>
          <span className="absolute inset-0 flex items-center justify-center">
            <Spinner size="sm" />
            <span className="sr-only">{loadingLabel}</span>
          </span>
        </>
      ) : (
        <>
          {leadingIcon}
          {children}
          {trailingIcon}
        </>
      )}
    </button>
  )
}

export interface ButtonLinkProps {
  href: string
  variant?: ButtonVariant
  size?: ButtonSize
  block?: boolean
  className?: string
  children?: ReactNode
  leadingIcon?: ReactNode
  trailingIcon?: ReactNode
  'aria-label'?: string
  'aria-current'?: 'page' | 'step' | 'true' | undefined
  target?: string
  rel?: string
  prefetch?: boolean
}

/** Anchor styled as a button, for when the action is really navigation. */
export function ButtonLink({
  href,
  variant = 'primary',
  size = 'md',
  block = false,
  className,
  children,
  leadingIcon,
  trailingIcon,
  ...props
}: ButtonLinkProps) {
  return (
    <Link href={href} className={buttonVariants({ variant, size, block, className })} {...props}>
      {leadingIcon}
      {children}
      {trailingIcon}
    </Link>
  )
}

export { buttonVariants }