Chat Search

"use client"

import * as React from "react"
import { ChatSearch, ChatSearchChat } from "@/components/ui/chat-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 day = (n: number, h = 11) => new Date(2026, 9, 21 - n, h, 12)

const chats: ChatSearchChat[] = [
  {
    id: "runs",
    title: "Fix the slow runs page",
    updatedAt: day(0, 15),
    messages: [
      {
        id: "r1",
        role: "user",
        text: "The runs page takes about 4 seconds to load in production. Find out why and fix it.",
      },
      {
        id: "r2",
        role: "assistant",
        text: "Found it. getRuns loads every run with all of its logs, about 18,000 rows, while the page renders 20. I added a limit and left the logs out. One follow-up worth doing: runs has no index on created_at, so the sort will slow down again as the table grows.",
      },
      { id: "r3", role: "user", text: "Add the created_at index then." },
      {
        id: "r4",
        role: "assistant",
        text: "Added migration 0042_runs_created_at_index.sql. It creates the index concurrently, so the table stays writable while it builds. The query plan now uses an index scan and the sort step is gone.",
      },
    ],
  },
  {
    id: "notifications",
    title: "Partial index for unread notifications",
    updatedAt: day(3),
    messages: [
      {
        id: "n1",
        role: "user",
        text: "The unread badge query scans the whole notifications table. Can a partial index help?",
      },
      {
        id: "n2",
        role: "assistant",
        text: "Yes. A partial index on (user_id, created_at) WHERE read_at IS NULL stays small because most notifications are read within a day. Postgres only uses it when the query repeats the same predicate, so keep read_at IS NULL in the WHERE clause.",
      },
    ],
  },
  {
    id: "planner",
    title: "Explain the query planner output for runs",
    updatedAt: day(9),
    messages: [
      {
        id: "p1",
        role: "user",
        text: "What does Seq Scan on runs with a Sort node on top mean here?",
      },
      {
        id: "p2",
        role: "assistant",
        text: "Postgres read every row of runs, then sorted them in memory by created_at. Without an index on that column there is no cheaper path. With one, it can walk the index in order and stop after the first 20 rows.",
      },
    ],
  },
  {
    id: "stripe",
    title: "Retry logic for the Stripe worker",
    updatedAt: day(1, 18),
    messages: [
      {
        id: "s1",
        role: "user",
        text: "Webhook deliveries fail when the worker restarts mid-batch. Add retries.",
      },
      {
        id: "s2",
        role: "assistant",
        text: "The worker now retries failed deliveries with exponential backoff, capped at 5 attempts, and stores an idempotency key so a retried event is never applied twice.",
      },
    ],
  },
  {
    id: "vector",
    title: "Compare vector databases for search",
    updatedAt: day(23),
    messages: [
      {
        id: "v1",
        role: "user",
        text: "pgvector or a hosted vector database for 2 million documents?",
      },
      {
        id: "v2",
        role: "assistant",
        text: "At 2 million documents pgvector with an HNSW index is enough, and it keeps search in the same transaction as your data. A hosted service starts to pay off past roughly 50 million vectors or when you need filtering at very high write rates.",
      },
    ],
  },
  {
    id: "incident",
    title: "Draft the September incident review",
    updatedAt: day(30),
    messages: [
      {
        id: "i1",
        role: "user",
        text: "Write the incident review for the 47 minute API outage on September 18.",
      },
      {
        id: "i2",
        role: "assistant",
        text: "Draft ready. Root cause: a migration took an exclusive lock on accounts during peak traffic. Action items: run migrations with lock_timeout, and alert when p95 latency doubles for 3 minutes.",
      },
    ],
  },
]

const NOW = new Date(2026, 9, 21, 16, 40)

function ChatSearchDemo() {
  const [opened, setOpened] = React.useState<string>()
  return (
    <div className="flex w-full max-w-2xl flex-col gap-3">
      <div className="rounded-(--chatcn-radius-xl) bg-(color:--chatcn-surface) shadow-(--chatcn-shadow-border) flex h-[min(560px,80dvh)] flex-col overflow-hidden">
        <ChatSearch
          chats={chats}
          defaultQuery="index"
          assistantName="chatcn"
          now={NOW}
          onOpen={(result, { newTab }) =>
            setOpened(`${newTab ? "New tab: " : "Opened "}“${result.title}”`)
          }
          className="flex-1"
        />
      </div>
      <p aria-live="polite" className="text-[0.8125rem]/[1.25rem] text-(color:--chatcn-fg-subtle) h-5 text-center">
        {opened ?? ""}
      </p>
    </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 ChatSearchPreview() {
  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">
          <ChatSearchDemo />
        </div>
        <MoreOn slug="chat-search">Search across chats, with matches in context. On</MoreOn>
      </div>
    </FitFrame>
  )
}