Git Graph

"use client"

import * as React from "react"
import { GitCommit, GitGraph } from "@/components/ui/git-graph"

/** How long a choice holds a tour before it carries on. */
const RESUME_MS = 1800

/** True until `RESUME_MS` after the last `hold()`, for tours with their own state. */
function useHold() {
  const [held, setHeld] = React.useState(false)
  const timer = React.useRef(0)
  React.useEffect(() => () => window.clearTimeout(timer.current), [])
  const hold = React.useCallback(() => {
    setHeld(true)
    window.clearTimeout(timer.current)
    timer.current = window.setTimeout(() => setHeld(false), RESUME_MS)
  }, [])
  return [held, hold] as const
}

const reducedMotion = () => window.matchMedia("(prefers-reduced-motion: reduce)").matches

/** The commit the agent pushes while the demo plays. */
const PUSHED: GitCommit = {
  sha: "b7d9f1a3c5e7b9d2f4a6c8e1b3d5f7a9c2e4b6d8",
  parents: ["3f6d8b0a2c4e6f8a1b3d5f7a9c2e4b6d8f1a3c5e"],
  subject: "Address review: show failed batches first",
  body: "Requested by Tomas in review. Failed batches sort to the top and keep their retry count.",
  author: "Agent run 214",
  authorKind: "agent",
  date: "Just now",
  dateTitle: "Oct 28, 4:16 pm",
  refs: [{ name: "feat/batch-status", kind: "branch" }],
  files: [
    {
      path: "app/dashboard/payouts/batch-row.tsx",
      status: "modified",
      additions: 11,
      deletions: 4,
    },
  ],
}

/** What an agent pushes to the feature branch after review, then the merge that lands it. */
const SECOND: GitCommit = {
  sha: "c2e4b6d8f1a3c5e7b9d2f4a6c8e1b3d5f7a9c2e4",
  parents: [PUSHED.sha],
  subject: "Add a retry count column to batch rows",
  body: "Each failed batch shows how many retries are left before it pages someone.",
  author: "Agent run 214",
  authorKind: "agent",
  date: "Just now",
  refs: [{ name: "feat/batch-status", kind: "branch" }],
  files: [
    { path: "app/dashboard/payouts/batch-row.tsx", status: "modified", additions: 9, deletions: 2 },
    { path: "app/dashboard/payouts/columns.ts", status: "modified", additions: 6, deletions: 0 },
  ],
}

const THIRD: GitCommit = {
  sha: "d5f7a9c2e4b6d8f1a3c5e7b9d2f4a6c8e1b3d5f7",
  parents: [SECOND.sha],
  subject: "Update the batch row snapshot",
  body: "The snapshot now includes the retry column. No other markup changed.",
  author: "Agent run 214",
  authorKind: "agent",
  date: "Just now",
  refs: [{ name: "feat/batch-status", kind: "branch" }],
  files: [
    {
      path: "app/dashboard/payouts/__snapshots__/batch-row.test.tsx.snap",
      status: "modified",
      additions: 12,
      deletions: 3,
    },
  ],
}

/** A payouts service: an agent fixing a flaky test next to a person's feature branch. */
const HISTORY: GitCommit[] = [
  {
    sha: "e41b9c07d2a35f8816c0b2e94d1a7f3c5b6e0d21",
    parents: [
      "9d03c1f5ab72e4d6c8e1f0a3b5d7c9e2f4a6b8c0",
      "7a2f0e9d1c3b5a7e9f1d3c5b7a9e1f3d5c7b9a1e",
    ],
    subject: "Merge pull request #418 from agent/retry-clock",
    body: "Retry tests now run on an injected clock and seeded jitter. 20 consecutive CI runs passed.",
    author: "Ines Okafor",
    date: "4 min ago",
    dateTitle: "Oct 28, 4:12 pm",
    refs: [
      { name: "main", kind: "head" },
      { name: "origin/main", kind: "remote" },
    ],
  },
  {
    sha: "7a2f0e9d1c3b5a7e9f1d3c5b7a9e1f3d5c7b9a1e",
    parents: ["5c8e2a4f6b1d3e5a7c9b2d4f6a8c1e3b5d7f9a2c"],
    subject: "Seed jitter in retry tests",
    body: "The tests pass a fixed random() so the expected waits are exact: 100, 200 and 400 ms.",
    author: "Agent run 212",
    authorKind: "agent",
    date: "18 min ago",
    dateTitle: "Oct 28, 3:58 pm",
    refs: [{ name: "agent/retry-clock", kind: "branch" }],
    files: [{ path: "src/payouts/retry.test.ts", status: "modified", additions: 14, deletions: 6 }],
  },
  {
    sha: "3f6d8b0a2c4e6f8a1b3d5f7a9c2e4b6d8f1a3c5e",
    parents: ["1b4d6f8a3c5e7b9d2f4a6c8e1b3d5f7a9c2e4b6d"],
    subject: "Show payout batch status on the dashboard",
    author: "Tomas Lindqvist",
    date: "26 min ago",
    dateTitle: "Oct 28, 3:50 pm",
    refs: [{ name: "feat/batch-status", kind: "branch" }],
    files: [
      { path: "app/dashboard/payouts/batch-row.tsx", status: "added", additions: 82, deletions: 0 },
      { path: "app/dashboard/payouts/page.tsx", status: "modified", additions: 9, deletions: 3 },
    ],
  },
  {
    sha: "5c8e2a4f6b1d3e5a7c9b2d4f6a8c1e3b5d7f9a2c",
    parents: ["2e4a6c8f1b3d5e7a9c2f4b6d8e1a3c5f7b9d2e4a"],
    subject: "Inject sleep and random into retryWithBackoff",
    body: "Both default to the real implementations, so production behavior is unchanged.",
    author: "Agent run 212",
    authorKind: "agent",
    date: "31 min ago",
    dateTitle: "Oct 28, 3:45 pm",
    files: [
      { path: "src/payouts/retry.ts", status: "modified", additions: 6, deletions: 3 },
      { path: "src/payouts/types.ts", status: "modified", additions: 2, deletions: 0 },
    ],
  },
  {
    sha: "9d03c1f5ab72e4d6c8e1f0a3b5d7c9e2f4a6b8c0",
    parents: ["8c1e3a5f7b9d2e4a6c8f1b3d5e7a9c2f4b6d8e1a"],
    subject: "Bump vitest to 3.2.4",
    author: "Ines Okafor",
    date: "52 min ago",
    dateTitle: "Oct 28, 3:24 pm",
  },
  {
    sha: "1b4d6f8a3c5e7b9d2f4a6c8e1b3d5f7a9c2e4b6d",
    parents: ["8c1e3a5f7b9d2e4a6c8f1b3d5e7a9c2f4b6d8e1a"],
    subject: "Add batch status column",
    author: "Tomas Lindqvist",
    date: "1 h ago",
    dateTitle: "Oct 28, 3:10 pm",
  },
  {
    sha: "2e4a6c8f1b3d5e7a9c2f4b6d8e1a3c5f7b9d2e4a",
    parents: ["8c1e3a5f7b9d2e4a6c8f1b3d5e7a9c2f4b6d8e1a"],
    subject: "Add a failing case for the retry timeout",
    author: "Agent run 212",
    authorKind: "agent",
    date: "1 h ago",
    dateTitle: "Oct 28, 3:02 pm",
    files: [{ path: "src/payouts/retry.test.ts", status: "modified", additions: 18, deletions: 0 }],
  },
  {
    sha: "8c1e3a5f7b9d2e4a6c8f1b3d5e7a9c2f4b6d8e1a",
    parents: ["6a8c1e3b5d7f9a2c4e6b8d1f3a5c7e9b2d4f6a8c"],
    subject: "Release 2.14.0",
    author: "Ines Okafor",
    date: "Yesterday",
    dateTitle: "Oct 27, 6:40 pm",
    refs: [{ name: "v2.14.0", kind: "tag" }],
  },
  {
    sha: "6a8c1e3b5d7f9a2c4e6b8d1f3a5c7e9b2d4f6a8c",
    parents: [
      "4f6b8d1a3c5e7f9b2d4a6c8e1f3b5d7a9c2e4f6b",
      "0d2f4b6a8c1e3d5f7b9a2c4e6d8f1b3a5c7e9d2f",
    ],
    subject: "Merge pull request #409 from feat/ledger-split",
    author: "Yara Haddad",
    date: "Yesterday",
    dateTitle: "Oct 27, 2:15 pm",
  },
  {
    sha: "0d2f4b6a8c1e3d5f7b9a2c4e6d8f1b3a5c7e9d2f",
    parents: ["4f6b8d1a3c5e7f9b2d4a6c8e1f3b5d7a9c2e4f6b"],
    subject: "Split payouts across ledgers by currency",
    author: "Yara Haddad",
    date: "2 days ago",
    dateTitle: "Oct 26, 11:30 am",
  },
  {
    sha: "4f6b8d1a3c5e7f9b2d4a6c8e1f3b5d7a9c2e4f6b",
    parents: ["c3e5a7f9b2d4e6a8c1f3b5d7e9a2c4f6b8d1e3a5"],
    subject: "Round payouts once, after allocation",
    author: "Yara Haddad",
    date: "3 days ago",
    dateTitle: "Oct 25, 9:05 am",
  },
]

const MAIN = HISTORY[0]!

const MERGE: GitCommit = {
  sha: "f9a2c4e6b8d1f3a5c7e9b2d4f6a8c1e3b5d7f9a2",
  parents: [MAIN.sha, THIRD.sha],
  subject: "Merge pull request #421 from feat/batch-status",
  body: "Approved by Tomas Lindqvist. Checks passed on all three commits.",
  author: "Tomas Lindqvist",
  date: "Just now",
  refs: [
    { name: "main", kind: "head" },
    { name: "origin/main", kind: "remote" },
  ],
}

const STEPS = [PUSHED, SECOND, THIRD, MERGE]

const BEATS = STEPS.length + 2

const STEP_MS = 1100

/** After the third push the view filters to agent commits for a beat, then the merge lands. */
const FILTER_AT = 4

/** Adds `commit` on top, moving the refs it carries off their old commits. */
function push(list: GitCommit[], commit: GitCommit) {
  const moved = new Set(commit.refs?.map((r) => r.name))
  return [
    commit,
    ...list.map((c) => {
      const refs = c.refs?.filter((r) => !moved.has(r.name))
      return refs?.length === c.refs?.length ? c : { ...c, refs: refs?.length ? refs : undefined }
    }),
  ]
}

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>
  )
}

/** 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>
  )
}

/**
 * A payouts service while an agent answers review: three commits land on the feature branch,
 * each opening as it arrives, the view filters to agent commits, then the pull request merges.
 * Then it plays again; a click holds it for a moment.
 */
export default function GitGraphPreview() {
  const [count, setCount] = React.useState(0)
  const [touched, touch] = useHold()
  React.useEffect(() => {
    if (reducedMotion() || touched) return
    const id = window.setInterval(
      () => setCount((n) => (n >= BEATS ? 0 : n + 1)),
      STEP_MS,
    )
    return () => window.clearInterval(id)
  }, [touched])
  // Beats: three pushes, the agent filter, the merge, a hold on the result.
  const shown = Math.min(count >= FILTER_AT ? count - 1 : count, STEPS.length)
  const filtered = count === FILTER_AT
  const commits = STEPS.slice(0, shown).reduce(push, HISTORY)
  const newest = shown ? STEPS[shown - 1]!.sha : (HISTORY[1]?.sha ?? "")
  const [picked, setPicked] = React.useState<string | null>(null)
  const [open, setOpen] = React.useState<string[]>([])
  const [agentOnly, setAgentOnly] = React.useState(false)
  return (
    <FitFrame minWidth="48rem">
      <div className="flex w-full flex-col items-center justify-center gap-6 p-6">
        <div className="w-full max-w-4xl">
          <GitGraph
            commits={commits}
            fresh={STEPS.slice(0, shown).map((c) => c.sha)}
            value={touched ? picked : newest}
            onValueChange={(sha) => {
              touch()
              setPicked(sha)
            }}
            expanded={touched ? open : [newest]}
            onExpandedChange={(next) => {
              touch()
              setOpen(next)
            }}
            agentOnly={touched ? agentOnly : filtered}
            onAgentOnlyChange={(next) => {
              touch()
              setAgentOnly(next)
            }}
            title="harbor-ledger"
          />
        </div>
        <MoreOn slug="git-graph">Lanes, refs, agent commits and live pushes. On</MoreOn>
      </div>
    </FitFrame>
  )
}