Tool Web Search

"use client"

import * as React from "react"
import { ToolWebSearch } from "@/components/ui/tool-web-search"

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.
 *
 * `minWidth` lays out a wide demo (a table, a two column panel) at that width and scales it down
 * to the frame, instead of letting it collapse to a narrow layout. The frame centers it, so it
 * shrinks evenly on both sides.
 *
 * 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,
  minWidth,
}: {
  children: React.ReactNode
  mode?: "scale" | "crop"
  hideBelow?: number
  minWidth?: string
}) {
  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)
    // Content that changes inside a fixed width box (a headline that cycles words) never resizes
    // the box itself, so changes below it measure again on the next frame.
    let frame = 0
    const mutations = new MutationObserver(() => {
      cancelAnimationFrame(frame)
      frame = requestAnimationFrame(measure)
    })
    mutations.observe(el, { subtree: true, childList: true, characterData: true })
    window.addEventListener("resize", measure)
    return () => {
      observer.disconnect()
      mutations.disconnect()
      cancelAnimationFrame(frame)
      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", minWidth }}
      >
        {children}
      </div>
    </div>
  )
}

const RESULTS = [
  {
    title: "loading.js file convention",
    url: "https://nextjs.org/docs/app/api-reference/file-conventions/loading",
    snippet:
      "loading.js will be nested inside layout.js. It will automatically wrap the page.js file and any children below in a <Suspense> boundary.",
  },
  {
    title: "Why is my loading.tsx not showing? Discussion #50120",
    url: "https://github.com/vercel/next.js/discussions/50120",
    snippet:
      "Data awaited in a layout blocks rendering before the loading boundary. Start the request in the layout and pass the promise down.",
  },
  {
    title: "use, React reference",
    url: "https://react.dev/reference/react/use",
    snippet:
      "use is a React API that lets you read the value of a resource like a Promise or context.",
  },
  {
    title: "Streaming with Suspense",
    url: "https://nextjs.org/learn/dashboard-app/streaming",
    snippet:
      "Streaming lets you break a route into smaller chunks and progressively stream them from the server as they become ready.",
  },
  {
    title: "Instant loading states in the App Router",
    url: "https://vercel.com/blog/instant-loading-states",
    snippet:
      "Show meaningful UI immediately while the rest of the route streams in, without blocking on data in shared layouts.",
  },
  {
    title: "Suspense, React reference",
    url: "https://react.dev/reference/react/Suspense",
    snippet: "Suspense lets you display a fallback until its children have finished loading.",
  },
  {
    title: "Layouts and pages",
    url: "https://nextjs.org/docs/app/getting-started/layouts-and-pages",
    snippet: "A layout is UI that is shared between multiple pages.",
  },
]

function ToolWebSearchDemo() {
  return (
    <div className="flex w-full max-w-xl flex-col gap-3">
      <ToolWebSearch
        state="output-available"
        query="next.js loading.tsx not showing await in layout"
        results={RESULTS}
        durationMs={1320}
        defaultOpen
      />
      <ToolWebSearch
        variant="inline"
        state="input-available"
        query="react 19 use() promise from server component"
      />
    </div>
  )
}

/** The line under each 21st demo that points back to the kit. */
function MoreOn({ slug, children }: { slug: string; children: React.ReactNode }) {
  return (
    <p data-fit-hide className="text-[0.75rem]/[1rem] text-(color:--chatcn-fg-faint) text-center text-balance">
      {children}{" "}
      <a
        href={`https://chatcn.dev/docs/components/${slug}`}
        target="_blank"
        rel="noopener"
        className="text-(color:--chatcn-fg-subtle) hover:text-(color:--chatcn-fg) underline underline-offset-2"
      >
        chatcn.dev
      </a>
    </p>
  )
}

/** The kit's own example, framed for the 21st preview. */
export default function ToolWebSearchPreview() {
  return (
    <FitFrame minWidth="38rem">
      <div className="flex w-full flex-col items-center justify-center gap-4 p-6">
        <div className="flex w-full max-w-2xl justify-center">
          <ToolWebSearchDemo />
        </div>
        <MoreOn slug="tool-web-search">Web searches an agent ran, with sources. On</MoreOn>
      </div>
    </FitFrame>
  )
}