Engine telegraph

pnpm add @base-ui/react cn

/*
 * Bevel foundation. Every component builds on these tokens and utilities;
 * component stylesheets only add their own palettes and shapes.
 *
 * Layers:
 *   1. Light     one source, above and slightly in front of the screen.
 *   2. Depth     named elevations built from the light: recessed, flush,
 *                raised, pressed, object.
 *   3. Material  a surface recipe (leather, plastic, metal) that reads
 *                --bevel-material and --bevel-material-edge.
 *   4. Motion    two curves, a spring, and durations named by purpose.
 *   5. Shape     radii, stitching, and the type scale for amounts.
 */

:root {
  /* 1. Light */
  --bevel-highlight: oklch(1 0 0 / 0.22);
  --bevel-highlight-strong: oklch(1 0 0 / 0.35);
  --bevel-shade: oklch(0 0 0 / 0.32);
  --bevel-shade-strong: oklch(0 0 0 / 0.5);
  --bevel-cast: oklch(0.25 0.03 50 / 0.22);
  /* Stamped into a surface: shaded on the upper inner edge, lit below. */
  --bevel-deboss: 0 -1px 0 oklch(0 0 0 / 0.45), 0 1px 0 oklch(1 0 0 / 0.12);

  /* 3. Material defaults; components and variants override these. */
  --bevel-material: oklch(0.47 0.085 52);
  --bevel-material-edge: oklch(0.3 0.06 44);
  --bevel-material-recess: oklch(0.2 0.008 260); /* neutral dark; materials set their own */
  --bevel-grain: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.7' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .7 0 0 0 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23g)'/%3E%3C/svg%3E");
  --bevel-grain-size: 180px;

  /* 2. Depth */
  --bevel-depth-recessed:
    inset 0 1px 2px var(--bevel-shade-strong),
    0 1px 0 var(--bevel-highlight);
  --bevel-depth-flush:
    inset 0 1px 0 var(--bevel-highlight),
    inset 0 -1px 0 var(--bevel-shade);
  --bevel-depth-raised:
    inset 0 1px 0 var(--bevel-highlight),
    0 1px 0 var(--bevel-material-edge),
    0 2px 0 var(--bevel-material-edge),
    0 3px 5px var(--bevel-shade);
  --bevel-depth-pressed:
    inset 0 1px 2px var(--bevel-shade),
    0 1px 0 var(--bevel-highlight);
  /* A whole object resting on the page. */
  --bevel-depth-object:
    inset 0 1px 0 var(--bevel-highlight),
    inset 0 -1px 0 var(--bevel-shade),
    0 0 0 1px var(--bevel-material-edge),
    0 1px 1px var(--bevel-cast),
    0 6px 12px -2px var(--bevel-cast),
    0 18px 32px -8px var(--bevel-cast);
  /* The shadow under a loose object, for filter: drop-shadow(). */
  --bevel-depth-cast-sm: 0 4px 6px var(--bevel-cast);
  /* A thin object (a card) lying on another surface. */
  --bevel-depth-sheet:
    inset 0 1px 0 var(--bevel-highlight-strong),
    inset 0 0 0 1px oklch(0 0 0 / 0.12),
    0 -1px 2px oklch(0 0 0 / 0.18);

  /* 4. Motion */
  --bevel-ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --bevel-ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
  /* Underdamped spring, ~8% overshoot. Pure CSS; pair with --bevel-duration-move or longer. */
  --bevel-ease-spring: linear(0, 0.06, 0.202, 0.38, 0.561, 0.723, 0.856, 0.955, 1.023, 1.062, 1.081, 1.083, 1.075, 1.062, 1.047, 1.032, 1.019, 1.009, 1.002, 0.997, 0.994, 0.993, 0.993, 0.994, 1);
  --bevel-duration-press: 100ms; /* a control giving under a finger */
  --bevel-duration-small: 200ms; /* hover lifts, tabs, small state changes */
  --bevel-duration-move: 300ms; /* objects moving: cards, drawers */
  --bevel-duration-ambient: 520ms; /* whole-scene changes: lighting */
  --bevel-stagger: 30ms;
  --bevel-lift: 3px; /* how far an object rises on hover */
  --bevel-perspective: 30rem; /* viewing distance for parts that turn in 3D (covers, flaps) */
  /* Unchosen items in a group sit back in shadow. */
  --bevel-dim: 0.82;

  /* 5. Shape */
  --bevel-radius-xs: 0.25rem;
  --bevel-radius-sm: 0.5rem;
  --bevel-radius-md: 0.625rem;
  --bevel-radius-lg: 1rem;
  --bevel-radius-xl: 1.5rem;
  --bevel-stitch-width: 1.5px;
  --bevel-stitch-inset: 0.375rem;
  /* Amounts: the figure, its secondary parts (currency, cents), labels, fine print. */
  --bevel-amount: 2.25rem;
  --bevel-amount-minor: 1.25rem;
  --bevel-label: 0.75rem;
  --bevel-fine: 0.6875rem;
  --bevel-tracking-label: 0.08em; /* stamped labels */
  --bevel-tracking-print: 0.06em; /* printed marks on cards */

  /* Paper and ink */
  --bevel-paper: oklch(0.975 0.008 85);
  --bevel-paper-foreground: oklch(0.28 0.02 260);
  --bevel-paper-muted: oklch(0.48 0.015 260);
  --bevel-paper-rule: oklch(0.78 0.04 240 / 0.45);
  --bevel-paper-margin: oklch(0.68 0.14 25 / 0.45);
  --bevel-fibre: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='f'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9 .35' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .18 0 0 0 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23f)'/%3E%3C/svg%3E");
  /* Ink soaks unevenly: mostly solid with pale specks. Used as a mask. */
  --bevel-ink-texture: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='i'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -2.4 0 0 0 2.1'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23i)'/%3E%3C/svg%3E");
  --bevel-ink-red: oklch(0.52 0.19 27);
  --bevel-ink-blue: oklch(0.44 0.14 262);
  --bevel-ink-green: oklch(0.5 0.12 155);
  --bevel-ink-black: oklch(0.3 0.01 260);
  --bevel-ink-amber: oklch(0.55 0.13 65);

  /* Brass and ivory: instrument hardware and dial faces */
  --bevel-brass: oklch(0.76 0.11 82);
  --bevel-brass-edge: oklch(0.52 0.08 70);
  --bevel-ivory: oklch(0.95 0.025 90);
  --bevel-ivory-foreground: oklch(0.25 0.015 60);
  --bevel-needle: oklch(0.55 0.2 27);

  /* Desk stationery: legal pads, pens, pencils, exhibit stickers */
  --bevel-pad: oklch(0.95 0.075 98); /* yellow legal pad */
  --bevel-pad-foreground: oklch(0.27 0.03 255);
  --bevel-pad-rule: oklch(0.72 0.06 235 / 0.45);
  --bevel-pad-margin: oklch(0.62 0.16 25 / 0.55);
  --bevel-pen-red: oklch(0.52 0.2 27); /* correcting pen */
  --bevel-pen-blue: oklch(0.42 0.15 262); /* writing pen */
  --bevel-pencil: oklch(0.55 0.01 260); /* not written in ink yet */
  --bevel-sticker: oklch(0.9 0.12 95); /* exhibit sticker */
  --bevel-sticker-foreground: oklch(0.26 0.03 70);
  /* Handwriting. Bring a marker font (e.g. Permanent Marker) for the full effect; these are fallbacks. */
  --bevel-font-marker: "Permanent Marker", "Marker Felt", "Chalkboard SE", ui-rounded, "Arial Rounded MT Bold", system-ui, sans-serif;
}

.dark {
  --bevel-highlight: oklch(1 0 0 / 0.14);
  /* Paper under dim light, not inverted: it's still paper. */
  --bevel-paper: oklch(0.88 0.008 85);
  --bevel-ivory: oklch(0.86 0.022 90);
  --bevel-pad: oklch(0.86 0.07 98);
  --bevel-cast: oklch(0 0 0 / 0.55);
}

/* Depth */
@utility bevel-recessed {
  background-color: var(--bevel-material-recess);
  box-shadow: var(--bevel-depth-recessed);
}
@utility bevel-flush {
  box-shadow: var(--bevel-depth-flush);
}
@utility bevel-raised {
  background-color: color-mix(in oklch, var(--bevel-material), white 7%);
  background-image: linear-gradient(to bottom, var(--bevel-highlight), transparent 60%);
  box-shadow: var(--bevel-depth-raised);
}
@utility bevel-pressed {
  background-color: color-mix(in oklch, var(--bevel-material), black 4%);
  background-image: none;
  box-shadow: var(--bevel-depth-pressed);
}
@utility bevel-object {
  box-shadow: var(--bevel-depth-object);
}

/* Materials */
@utility bevel-leather {
  background-color: var(--bevel-material);
  background-image:
    var(--bevel-grain),
    linear-gradient(to bottom, var(--bevel-highlight), transparent 28%, transparent 72%, var(--bevel-shade));
  background-size: var(--bevel-grain-size) var(--bevel-grain-size), 100% 100%;
  background-blend-mode: soft-light, normal;
}
@utility bevel-plastic {
  background-color: var(--bevel-material);
  background-image:
    linear-gradient(115deg, var(--bevel-highlight-strong), transparent 40%),
    linear-gradient(to bottom, transparent 25%, oklch(0 0 0 / 0.45));
  box-shadow: var(--bevel-depth-sheet);
}
@utility bevel-metal {
  background-color: var(--bevel-material);
  background-image:
    linear-gradient(to bottom, var(--bevel-highlight-strong), transparent 45%, var(--bevel-shade) 100%),
    repeating-linear-gradient(90deg, oklch(1 0 0 / 0.06) 0 1px, transparent 1px 3px);
  box-shadow:
    inset 0 0 0 1px oklch(0 0 0 / 0.25),
    inset 0 1px 0 var(--bevel-highlight-strong);
}

/* Details */
@utility bevel-deboss {
  text-shadow: var(--bevel-deboss);
}
@utility bevel-stitch {
  border-color: var(--bevel-stitch, oklch(0.88 0.05 82 / 0.8));
  border-style: dashed;
  border-width: var(--bevel-stitch-width);
  filter: drop-shadow(0 1px 0 var(--bevel-shade));
}
/* A lit fill sitting in a recess (meters, progress). Colour from --bevel-fill. */
@utility bevel-fill {
  background-color: var(--bevel-fill);
  background-image: linear-gradient(to bottom, oklch(1 0 0 / 0.55), transparent 55%, oklch(0 0 0 / 0.18));
  box-shadow: 0 0 6px -1px var(--bevel-fill);
}
/* A small indicator light. Colour from --bevel-led. */
@utility bevel-led {
  background-color: var(--bevel-led);
  background-image: radial-gradient(circle at 35% 30%, oklch(1 0 0 / 0.85), transparent 45%);
  box-shadow:
    0 0 6px var(--bevel-led),
    inset 0 -1px 1px oklch(0 0 0 / 0.35),
    0 1px 0 var(--bevel-highlight);
}

/* Paper: a sheet resting on the surface, with fibre in it. */
@utility bevel-paper {
  background-color: var(--bevel-paper);
  background-image: var(--bevel-fibre);
  background-size: 240px 240px;
  color: var(--bevel-paper-foreground);
  box-shadow:
    0 1px 1px var(--bevel-cast),
    0 6px 14px -4px var(--bevel-cast);
}
/* Ink on paper: multiplies into the surface and soaks unevenly. Colour from --bevel-ink. */
@utility bevel-ink {
  color: var(--bevel-ink, var(--bevel-ink-red));
  border-color: currentColor;
  mix-blend-mode: multiply;
  mask-image: var(--bevel-ink-texture);
  mask-size: 160px 160px;
}
/* Glass over an instrument window: one reflection from the light above. Put on an overlay element. */
@utility bevel-glass {
  pointer-events: none;
  background-image: linear-gradient(165deg, var(--bevel-highlight-strong) 0%, transparent 38%, transparent 70%, var(--bevel-shade) 100%);
}

/* Material families: one per screen. Set on the screen's container. */
[data-bevel-family="leather"] {
  --bevel-cast: oklch(0.25 0.03 50 / 0.22);
}
[data-bevel-family="paper"] {
  --bevel-cast: oklch(0.3 0.01 250 / 0.16);
}
.dark :is([data-bevel-family="leather"], [data-bevel-family="paper"]) {
  --bevel-cast: oklch(0 0 0 / 0.55);
}

/*
 * Ruled paper: rules every --bevel-rule-height and a margin line at
 * --bevel-rule-margin. Set --bevel-sheet for the paper colour. The ruling
 * scrolls with the content.
 */
@utility bevel-ruled {
  background-color: var(--bevel-sheet, var(--bevel-paper));
  background-image:
    linear-gradient(
      to right,
      transparent calc(var(--bevel-rule-margin) - 1px),
      var(--bevel-sheet-margin, var(--bevel-paper-margin)) calc(var(--bevel-rule-margin) - 1px) calc(var(--bevel-rule-margin) + 1px),
      transparent calc(var(--bevel-rule-margin) + 1px)
    ),
    repeating-linear-gradient(
      to bottom,
      transparent 0 calc(var(--bevel-rule-height) - 1px),
      var(--bevel-sheet-rule, var(--bevel-paper-rule)) calc(var(--bevel-rule-height) - 1px) var(--bevel-rule-height)
    ),
    var(--bevel-fibre);
  background-size: 100% 100%, 100% 100%, 240px 240px;
  background-attachment: local;
  color: var(--bevel-paper-foreground);
  box-shadow:
    0 1px 1px var(--bevel-cast),
    0 6px 14px -4px var(--bevel-cast);
}

"use client"

import * as React from "react"
import { Radio } from "@base-ui/react/radio"
import { RadioGroup } from "@base-ui/react/radio-group"
import { cn } from "cn"

type Order = { value: string; label: string }

type EngineTelegraphContextValue = {
  orders: Order[]
  register: (order: Order) => () => void
  value: string
  confirmed: string
  statusId: string
}

const EngineTelegraphContext = React.createContext<EngineTelegraphContextValue | null>(null)

function useEngineTelegraph() {
  const context = React.useContext(EngineTelegraphContext)
  if (!context) throw new Error("EngineTelegraph parts must be inside <EngineTelegraph>")
  return context
}

/* Orders spread over the top of the dial, from -70° to 70°. */
const SPREAD = 140

function angleOf(orders: Order[], value: string) {
  const i = orders.findIndex((o) => o.value === value)
  if (i === -1 || orders.length < 2) return 0
  return -SPREAD / 2 + (SPREAD * i) / (orders.length - 1)
}

type EngineTelegraphProps = Omit<React.ComponentProps<"div">, "onChange"> & {
  /** The order you've set. */
  value: string
  onValueChange?: (value: string) => void
  /** The order the other side has acknowledged. Differs from value while an order is pending. */
  confirmed: string
}

/**
 * An engine order telegraph. You set an order; the other side (an agent,
 * a service, a teammate) answers by confirming it. Both pointers show on
 * one dial, so a pending order is visible at a glance.
 */
function EngineTelegraph({ className, value, onValueChange, confirmed, children, ...props }: EngineTelegraphProps) {
  const [orders, setOrders] = React.useState<Order[]>([])
  const statusId = React.useId()
  const register = React.useCallback((order: Order) => {
    // Orders keep the order they mounted in, which is their order on the dial.
    setOrders((all) =>
      all.some((o) => o.value === order.value)
        ? all.map((o) => (o.value === order.value ? order : o))
        : [...all, order]
    )
    return () => setOrders((all) => all.filter((o) => o.value !== order.value))
  }, [])
  const context = React.useMemo(
    () => ({ orders, register, value, confirmed, statusId }),
    [orders, register, value, confirmed, statusId]
  )
  return (
    <EngineTelegraphContext value={context}>
      <div
        role="group"
        data-slot="engine-telegraph"
        data-pending={value !== confirmed ? "" : undefined}
        className={cn("flex w-full max-w-sm flex-col items-center gap-4", className)}
        {...props}
      >
        <RadioGroup
          value={value}
          onValueChange={(next) => onValueChange?.(next as string)}
          aria-describedby={statusId}
          className="contents"
        >
          {children}
        </RadioGroup>
      </div>
    </EngineTelegraphContext>
  )
}

/** The dial: your handle and the answering pointer, over the orders. */
function EngineTelegraphDial({ className, ...props }: React.ComponentProps<"div">) {
  const { orders, value, confirmed } = useEngineTelegraph()
  return (
    <div
      aria-hidden
      data-slot="engine-telegraph-dial"
      className={cn("bevel-metal w-full rounded-t-full p-2 pb-0 shadow-(--bevel-depth-object)", className)}
      {...props}
    >
      <div className="relative overflow-hidden rounded-t-full bg-(--bevel-ivory) text-(--bevel-ivory-foreground) shadow-(--bevel-depth-recessed)">
        <svg viewBox="0 0 100 60" className="block w-full">
          {orders.map((order) => {
            const angle = angleOf(orders, order.value)
            return (
              <g key={order.value} transform={`rotate(${angle} 50 56)`}>
                <line x1="50" y1="6" x2="50" y2="12" stroke="currentColor" strokeWidth="0.8" />
                <text x="50" y="19" textAnchor="middle" fontSize="4.6" fontWeight="700" fill="currentColor">
                  {order.label.toUpperCase()}
                </text>
              </g>
            )
          })}
          {/* The answer pointer: short and red, moved by the other side. */}
          <g
            className="origin-(--engine-telegraph-pivot) transition-[rotate] duration-(--bevel-duration-ambient) ease-(--bevel-ease-spring) motion-reduce:transition-none"
            style={{ rotate: `${angleOf(orders, confirmed)}deg` }}
          >
            <path d="M48.6 56 L50 26 L51.4 56 Z" fill="var(--engine-telegraph-answer)" />
          </g>
          {/* Your handle: long and dark, moved by you. */}
          <g
            className="origin-(--engine-telegraph-pivot) transition-[rotate] duration-(--bevel-duration-move) ease-(--bevel-ease-out) motion-reduce:transition-none"
            style={{ rotate: `${angleOf(orders, value)}deg` }}
          >
            <path d="M49.2 56 L50 22 L50.8 56 Z" fill="currentColor" />
            <rect x="47.5" y="21" width="5" height="3" rx="1" fill="currentColor" />
          </g>
          <circle cx="50" cy="56" r="4" fill="var(--bevel-brass)" stroke="var(--bevel-brass-edge)" strokeWidth="0.6" />
        </svg>
        <span className="bevel-glass absolute inset-0" />
      </div>
    </div>
  )
}

/** The orders you can give: a row of plates. */
function EngineTelegraphOrders({ className, ...props }: React.ComponentProps<"div">) {
  return <div data-slot="engine-telegraph-orders" className={cn("flex flex-wrap justify-center gap-2", className)} {...props} />
}

type EngineTelegraphOrderProps = Omit<Radio.Root.Props, "value" | "children"> & {
  value: string
  /** Shown on the plate and the dial. Keep it to a word. */
  children: string
}

/** One order. A radio: arrow keys move between orders. */
function EngineTelegraphOrder({ className, value, children, ...props }: EngineTelegraphOrderProps) {
  const { register, confirmed } = useEngineTelegraph()
  React.useEffect(() => register({ value, label: children }), [value, children, register])
  return (
    <Radio.Root
      value={value}
      data-slot="engine-telegraph-order"
      data-confirmed={confirmed === value ? "" : undefined}
      className={cn(
        "bevel-raised flex h-9 min-w-14 items-center justify-center rounded-(--bevel-radius-sm) px-3 text-xs font-bold tracking-(--bevel-tracking-label) text-(--bevel-ivory-foreground) uppercase outline-none select-none",
        "transition-[translate,box-shadow] duration-(--bevel-duration-press) ease-(--bevel-ease-out) motion-reduce:transition-none",
        "data-checked:translate-y-0.5 data-checked:bevel-pressed",
        "focus-visible:ring-3 focus-visible:ring-ring/60 data-disabled:cursor-not-allowed data-disabled:opacity-50",
        className
      )}
      {...props}
    >
      {children}
    </Radio.Root>
  )
}

/** Whether the other side has answered, in words. Announced when that changes. */
function EngineTelegraphStatus({ className, ...props }: React.ComponentProps<"p">) {
  const { orders, value, confirmed, statusId } = useEngineTelegraph()
  const label = (v: string) => orders.find((o) => o.value === v)?.label ?? v
  return (
    <p
      id={statusId}
      role="status"
      data-slot="engine-telegraph-status"
      className={cn("flex items-center gap-2 text-sm text-muted-foreground", className)}
      {...props}
    >
      <span aria-hidden className="bevel-led size-2 rounded-full" />
      {value === confirmed
        ? `Confirmed: ${label(confirmed)}.`
        : `Ordered: ${label(value)}. Waiting for confirmation (now at ${label(confirmed)}).`}
    </p>
  )
}

export { EngineTelegraph, EngineTelegraphDial, EngineTelegraphOrders, EngineTelegraphOrder, EngineTelegraphStatus }
export type { EngineTelegraphProps, EngineTelegraphOrderProps }

/*
 * Engine telegraph: a ship's order dial. The bridge sets the handle; the
 * engine room answers by moving its own pointer to match. Until the two
 * agree, the order is pending. Builds on bevel.css (brass, ivory, metal).
 */

:root {
  --engine-telegraph-answer: oklch(0.55 0.2 27); /* the engine room's pointer */
  --engine-telegraph-pending: oklch(0.78 0.16 75);
  --engine-telegraph-agreed: oklch(0.72 0.16 150);
  --engine-telegraph-pivot: 50px 56px; /* the pointers' hub, in dial units */
}

[data-slot="engine-telegraph"] {
  --bevel-material: var(--bevel-brass);
  --bevel-material-edge: var(--bevel-brass-edge);
  --bevel-led: var(--engine-telegraph-agreed);
}
[data-slot="engine-telegraph"][data-pending] {
  --bevel-led: var(--engine-telegraph-pending);
}

@import "./bevel.css";
@import "./engine-telegraph.css";