Dashboard chart panel

import { Panel } from '@/components/ui/card'
import { Badge } from '@/components/ui/badge'
import { Divider } from '@/components/ui/layout'

/**
 * Dashboard chart panel
 *
 * A bar chart drawn as inline SVG rather than pulling in a charting library.
 * Foundry ships no chart dependency, so the series is also exposed as a real
 * table for assistive tech and for anyone who wants the numbers — which is the
 * correct treatment for a chart regardless of how it is drawn.
 */
const series = [
  { month: 'Oct', value: 128 },
  { month: 'Nov', value: 142 },
  { month: 'Dec', value: 131 },
  { month: 'Jan', value: 156 },
  { month: 'Feb', value: 168 },
  { month: 'Mar', value: 184 },
]

const max = Math.max(...series.map((point) => point.value))

export default function DashboardChartPanel() {
  return (
    <section className="bg-canvas p-4 sm:p-6">
      <Panel
        title="Monthly recurring revenue"
        description="Thousands of USD, last six months"
        headingLevel="h2"
        action={<Badge tone="success">+12.4%</Badge>}
      >
        <div className="flex h-52 items-end gap-2 sm:gap-4" aria-hidden="true">
          {series.map((point) => (
            <div key={point.month} className="flex min-w-0 flex-1 flex-col items-center gap-2">
              <span className="font-mono text-2xs text-ink-muted tabular-nums">{point.value}</span>
              <div
                className="w-full rounded-t-sm bg-accent transition-[height] duration-300"
                style={{ height: `${(point.value / max) * 100}%` }}
              />
              <span className="label-caps text-ink-subtle">{point.month}</span>
            </div>
          ))}
        </div>

        <Divider className="my-5" weight="subtle" />

        {/* The chart is decorative; this table is the accessible content. */}
        <table className="w-full text-sm">
          <caption className="sr-only">
            Monthly recurring revenue in thousands of USD, October to March
          </caption>
          <thead>
            <tr>
              <th scope="col" className="label-caps pb-2 text-left text-ink-subtle">
                Month
              </th>
              <th scope="col" className="label-caps pb-2 text-right text-ink-subtle">
                Revenue
              </th>
            </tr>
          </thead>
          <tbody>
            {series.map((point) => (
              <tr key={point.month} className="border-t border-line-subtle">
                <th scope="row" className="py-1.5 text-left font-normal text-ink-muted">
                  {point.month}
                </th>
                <td className="py-1.5 text-right font-mono text-ink tabular-nums">
                  ${point.value},000
                </td>
              </tr>
            ))}
          </tbody>
        </table>
      </Panel>
    </section>
  )
}

import type { HTMLAttributes, ReactNode, ElementType } from 'react'
import { cn } from '@/lib/cn'

/**
 * Card & Panel
 *
 * Two containment primitives with deliberately different jobs:
 *
 *   Card  — a discrete, often interactive record in a collection.
 *   Panel — a titled region of a page, with an optional header action row.
 *
 * Keeping them separate is what stops the library from degenerating into
 * "everything is a rounded box with a shadow".
 */

export interface CardProps extends HTMLAttributes<HTMLDivElement> {
  as?: ElementType
  /** Forwarded when `as` renders a link. */
  href?: string
  /** `outline` is the default; `raised` adds elevation; `sunken` insets. */
  tone?: 'outline' | 'raised' | 'sunken' | 'ghost' | 'accent'
  /** Adds hover affordance. Only use when the whole card is a link/button. */
  interactive?: boolean
  padding?: 'none' | 'sm' | 'md' | 'lg'
}

const cardTones = {
  outline: 'bg-surface border border-line',
  raised: 'bg-surface-raised border border-line shadow-sm',
  sunken: 'bg-surface-sunken border border-line-subtle',
  ghost: 'bg-transparent border border-transparent',
  accent: 'bg-accent-soft border border-accent-line',
} as const

const cardPadding = {
  none: 'p-0',
  sm: 'p-3',
  md: 'p-card',
  lg: 'p-6 sm:p-8',
} as const

export function Card({
  as: Tag = 'div',
  tone = 'outline',
  interactive = false,
  padding = 'md',
  className,
  children,
  ...props
}: CardProps) {
  return (
    <Tag
      className={cn(
        'rounded-lg',
        cardTones[tone],
        cardPadding[padding],
        interactive &&
          'transition-[border-color,box-shadow,background-color] duration-150 ease-standard hover:border-line-strong hover:shadow-sm',
        className,
      )}
      {...props}
    >
      {children}
    </Tag>
  )
}

export function CardHeader({ className, children, ...props }: HTMLAttributes<HTMLDivElement>) {
  return (
    <div className={cn('flex items-start justify-between gap-4', className)} {...props}>
      {children}
    </div>
  )
}

export function CardTitle({
  as: Tag = 'h3',
  className,
  children,
  ...props
}: HTMLAttributes<HTMLHeadingElement> & { as?: ElementType }) {
  return (
    <Tag className={cn('text-md leading-snug font-semibold text-ink-strong', className)} {...props}>
      {children}
    </Tag>
  )
}

export function CardDescription({
  className,
  children,
  ...props
}: HTMLAttributes<HTMLParagraphElement>) {
  return (
    <p className={cn('text-sm leading-normal text-ink-muted', className)} {...props}>
      {children}
    </p>
  )
}

export function CardFooter({ className, children, ...props }: HTMLAttributes<HTMLDivElement>) {
  return (
    <div
      className={cn(
        'mt-4 flex flex-wrap items-center gap-3 border-t border-line-subtle pt-4',
        className,
      )}
      {...props}
    >
      {children}
    </div>
  )
}

export interface PanelProps extends Omit<HTMLAttributes<HTMLElement>, 'title'> {
  title: ReactNode
  description?: ReactNode
  /** Rendered on the right of the panel header. */
  action?: ReactNode
  /** Removes body padding — for tables and lists that manage their own. */
  flush?: boolean
  as?: ElementType
  headingLevel?: 'h2' | 'h3' | 'h4'
}

export function Panel({
  title,
  description,
  action,
  flush = false,
  as: Tag = 'section',
  headingLevel: Heading = 'h3',
  className,
  children,
  ...props
}: PanelProps) {
  return (
    <Tag
      className={cn('overflow-hidden rounded-lg border border-line bg-surface', className)}
      {...props}
    >
      <div className="flex flex-wrap items-start justify-between gap-3 border-b border-line-subtle bg-surface-sunken px-4 py-3">
        <div className="min-w-0">
          <Heading className="text-sm font-semibold text-ink-strong">{title}</Heading>
          {description ? <p className="mt-0.5 text-xs text-ink-muted">{description}</p> : null}
        </div>
        {action ? <div className="flex shrink-0 items-center gap-2">{action}</div> : null}
      </div>
      <div className={cn(flush ? '' : 'p-card')}>{children}</div>
    </Tag>
  )
}