Halftone Orb

"use client"

import * as React from "react"
import { HalftoneOrb, VoiceOrbState, createChatcnSpeechLevel, voiceOrbStateLabels } from "@/components/ui/halftone-orb"

/** A turn of conversation that plays until you pick a state yourself. */
const SCRIPT: [VoiceOrbState, number][] = [
  ["listening", 3400],
  ["thinking", 1800],
  ["speaking", 4200],
  ["idle", 1400],
]

const FIT_CSS = "html,body{overflow:hidden}[data-fit-small] [data-fit-hide]{display:none!important}"

/**
 * 21st shows a demo in a small frame: about 674 by 421 on a component page, 358 by 224 on a
 * phone and 245 by 139 on a profile card. A demo taller than its frame gets scrollbars, which
 * render white on dark pages. FitFrame fills the frame exactly instead.
 *
 * - "scale": the content shrinks until it fits, centered. For visuals such as orbs.
 * - "crop": the content stays at full size from the top and fades out at the bottom. For text
 *   that streams in, where a changing scale would make the page breathe.
 *
 * Anything marked `data-fit-hide` (state buttons, the chatcn.dev line) drops out in frames
 * shorter than `hideBelow`, so a profile card shows the visual alone.
 */
function FitFrame({
  children,
  mode = "scale",
  hideBelow = 360,
}: {
  children: React.ReactNode
  mode?: "scale" | "crop"
  hideBelow?: number
}) {
  const content = React.useRef<HTMLDivElement>(null)
  const [cropped, setCropped] = React.useState(false)

  React.useLayoutEffect(() => {
    const el = content.current
    if (!el) return
    const measure = () => {
      const vw = window.innerWidth
      const vh = window.innerHeight
      el.toggleAttribute("data-fit-small", vh < hideBelow)
      // Layout sizes ignore the transform, so measuring never feeds back.
      const w = Math.max(el.offsetWidth, el.scrollWidth)
      const h = Math.max(el.offsetHeight, el.scrollHeight)
      const scale = mode === "scale" ? Math.min(1, vw / w, vh / h) : 1
      el.style.transform = scale < 1 ? `scale(${scale})` : ""
      setCropped(mode === "crop" && h > vh + 1)
    }
    measure()
    const observer = new ResizeObserver(measure)
    observer.observe(el)
    window.addEventListener("resize", measure)
    return () => {
      observer.disconnect()
      window.removeEventListener("resize", measure)
    }
  }, [mode, hideBelow])

  const fade = "linear-gradient(to bottom, #000 calc(100% - 40px), transparent)"
  return (
    <div
      className="flex w-full justify-center overflow-hidden"
      style={{
        height: "100dvh",
        alignItems: mode === "crop" ? "flex-start" : "center",
        maskImage: cropped ? fade : undefined,
        WebkitMaskImage: cropped ? fade : undefined,
      }}
    >
      <style>{FIT_CSS}</style>
      <div
        ref={content}
        className="w-full shrink-0"
        style={{ transformOrigin: mode === "crop" ? "top center" : "center" }}
      >
        {children}
      </div>
    </div>
  )
}

const STATES: VoiceOrbState[] = [
  "idle",
  "connecting",
  "listening",
  "thinking",
  "speaking",
  "interrupted",
  "muted",
  "error",
]

export default function HalftoneOrbDemo() {
  const [state, setState] = React.useState<VoiceOrbState>("speaking")
  const [auto, setAuto] = React.useState(true)
  const user = React.useMemo(() => createChatcnSpeechLevel({ seed: 3 }), [])
  const agent = React.useMemo(() => createChatcnSpeechLevel({ seed: 7, loudness: 0.85 }), [])

  React.useEffect(() => {
    user.setSpeaking(state === "listening")
    agent.setSpeaking(state === "speaking")
  }, [state, user, agent])

  React.useEffect(() => {
    if (!auto) return
    let step = 2
    let timer = 0
    const next = () => {
      const [s, ms] = SCRIPT[step % SCRIPT.length]
      setState(s)
      step++
      timer = window.setTimeout(next, ms)
    }
    next()
    return () => window.clearTimeout(timer)
  }, [auto])

  return (
    <FitFrame>
      <div className="flex w-full flex-col items-center justify-center gap-8 p-6">
        <div className="flex flex-col items-center gap-4">
          <HalftoneOrb
            size="lg"
            state={state}
            inputLevel={user.getLevel}
            outputLevel={agent.getLevel}
          />
          <p aria-live="polite" className="text-[0.875rem]/[1.25rem] tracking-[-0.003em] text-(color:--chatcn-fg-muted) h-5 font-medium">
            {voiceOrbStateLabels[state]}
          </p>
        </div>
        <fieldset data-fit-hide className="flex max-w-md flex-wrap justify-center gap-1">
          <legend className="sr-only">Orb state</legend>
          {STATES.map((s) => (
            <button
              key={s}
              type="button"
              aria-pressed={s === state}
              onClick={() => {
                setAuto(false)
                setState(s)
              }}
              className="text-[0.8125rem]/[1.25rem] text-(color:--chatcn-fg-subtle) hover:text-(color:--chatcn-fg) hover:bg-(color:--chatcn-fill) aria-pressed:bg-(color:--chatcn-fill-active) aria-pressed:text-(color:--chatcn-fg) rounded-(--chatcn-radius-md) h-7 px-2.5 font-medium transition-colors"
            >
              {voiceOrbStateLabels[s]}
            </button>
          ))}
        </fieldset>
        <p data-fit-hide className="text-[0.75rem]/[1rem] text-(color:--chatcn-fg-faint)">
          Dither, ASCII, pixel and particle versions live on{" "}
          <a
            href="https://chatcn.dev/docs/components/halftone-orb"
            target="_blank"
            rel="noopener"
            className="text-(color:--chatcn-fg-subtle) hover:text-(color:--chatcn-fg) underline underline-offset-2"
          >
            chatcn.dev
          </a>
        </p>
      </div>
    </FitFrame>
  )
}