| 1 | /** |
| 2 | * The landing page's product tour: one story told as a timeline. Every |
| 3 | * frame is a pure function of the time into the loop, so the tour can be |
| 4 | * paused, resumed, jumped to a step, or shown still, and the server and |
| 5 | * the first client render agree (t = 0). |
| 6 | * |
| 7 | * The story is about the code. Priya's pull request #431 runs its checks, |
| 8 | * is approved by Dana and is merged by the queue, and production deploys. |
| 9 | * Then how it was made: the session Priya's coding agent recorded onto the |
| 10 | * pull request through g1t's MCP server. Then the people: #web, where Dana |
| 11 | * reported the bug and hears it shipped. Last, the docs page Dana updates. |
| 12 | */ |
| 13 | |
| 14 | export type Scene = "code" | "session" | "chat" | "docs"; |
| 15 | |
| 16 | /** Where the soft cursor points: an element marked `data-tour="<target>"`. */ |
| 17 | export type CursorTarget = "pr-session" | "rail-code" | "rail-chat" | "rail-docs" | "idle"; |
| 18 | |
| 19 | export type Frame = { |
| 20 | scene: Scene; |
| 21 | /** Checks passed on the pull request, 0 to CHECKS.length. */ |
| 22 | checks: number; |
| 23 | /** The diff is shown on the pull request. */ |
| 24 | diff: boolean; |
| 25 | /** Dana approved. */ |
| 26 | approved: boolean; |
| 27 | /** The merge queue merged it. */ |
| 28 | merged: boolean; |
| 29 | /** Entries of the recorded session shown, 0 to SESSION.length. */ |
| 30 | entries: number; |
| 31 | /** Priya posted in #web that it shipped. */ |
| 32 | shipped: boolean; |
| 33 | /** Dana says support has been told, in #web. */ |
| 34 | told: boolean; |
| 35 | /** The docs page shows the changed line. */ |
| 36 | docUpdated: boolean; |
| 37 | cursor: CursorTarget; |
| 38 | /** The cursor is pressing. */ |
| 39 | click: boolean; |
| 40 | /** The cursor is shown at all. */ |
| 41 | cursorShown: boolean; |
| 42 | }; |
| 43 | |
| 44 | /** One entry of the session the coding agent recorded onto the pull request. */ |
| 45 | export type SessionEntry = { kind: "prompt" | "message" | "tool"; text: string; tool?: string; commit?: string }; |
| 46 | |
| 47 | /** The session Priya's coding agent recorded onto #431 as it worked. */ |
| 48 | export const SESSION: SessionEntry[] = [ |
| 49 | { kind: "prompt", text: "Big accounts time out on CSV export (Dana's report in #web). Find out why and fix it." }, |
| 50 | { kind: "tool", tool: "read", text: "services/export/csv.py" }, |
| 51 | { kind: "message", text: "Every row loads before the first byte is sent, so accounts over 100k rows hit the 60 s limit." }, |
| 52 | { kind: "tool", tool: "bash", text: "pytest tests/test_export.py -k big_account → 3.1 s, was 61 s" }, |
| 53 | { kind: "message", text: "Rows now stream in batches of 1,000. Opened #431.", commit: "3f9c2a1" }, |
| 54 | ]; |
| 55 | |
| 56 | export const CHECKS = ["build", "test", "lint", "preview"]; |
| 57 | |
| 58 | /** The beats of the story, in ms from the start of the loop. */ |
| 59 | export const BEAT = { |
| 60 | code: 0, |
| 61 | check0: 900, |
| 62 | checkGap: 650, |
| 63 | diff: 1300, |
| 64 | approved: 3900, |
| 65 | merged: 5000, |
| 66 | sessionClick: 6300, |
| 67 | session: 6450, |
| 68 | entry0: 6700, |
| 69 | entryGap: 500, |
| 70 | railChatClick: 10000, |
| 71 | chat: 10150, |
| 72 | shipped: 11000, |
| 73 | told: 12200, |
| 74 | railDocsClick: 14000, |
| 75 | docs: 14150, |
| 76 | docUpdated: 15300, |
| 77 | end: 20000, |
| 78 | } as const; |
| 79 | |
| 80 | /** The whole loop, in ms. */ |
| 81 | export const LOOP_MS = BEAT.end; |
| 82 | |
| 83 | /** The step pills under the frame: where each starts, for jumping to it. */ |
| 84 | export const PILLS: { scene: Scene; label: string; start: number }[] = [ |
| 85 | { scene: "code", label: "Pull request", start: 0 }, |
| 86 | { scene: "session", label: "Session", start: BEAT.session }, |
| 87 | { scene: "chat", label: "Chat", start: BEAT.chat }, |
| 88 | { scene: "docs", label: "Artifacts", start: BEAT.docs }, |
| 89 | ]; |
| 90 | |
| 91 | /** Which pill a time falls under. */ |
| 92 | export function pillAt(t: number): number { |
| 93 | let index = 0; |
| 94 | PILLS.forEach((pill, i) => { |
| 95 | if (t >= pill.start) index = i; |
| 96 | }); |
| 97 | return index; |
| 98 | } |
| 99 | |
| 100 | /** How far through its pill a time is, 0 to 1. */ |
| 101 | export function pillProgress(t: number): number { |
| 102 | const index = pillAt(t); |
| 103 | const start = PILLS[index].start; |
| 104 | const end = PILLS[index + 1]?.start ?? LOOP_MS; |
| 105 | return Math.min(1, Math.max(0, (t - start) / (end - start))); |
| 106 | } |
| 107 | |
| 108 | function count(t: number, first: number, gap: number, max: number): number { |
| 109 | if (t < first) return 0; |
| 110 | return Math.min(max, Math.floor((t - first) / gap) + 1); |
| 111 | } |
| 112 | |
| 113 | /** Where the cursor is headed, and whether it is pressing, at time t. */ |
| 114 | function cursorAt(t: number): { cursor: CursorTarget; click: boolean } { |
| 115 | const press = (at: number) => t >= at && t < at + 180; |
| 116 | const moves: [number, CursorTarget][] = [ |
| 117 | [BEAT.merged + 300, "pr-session"], |
| 118 | [BEAT.session + 2600, "rail-chat"], |
| 119 | [BEAT.told + 500, "rail-docs"], |
| 120 | [BEAT.docs + 500, "idle"], |
| 121 | ]; |
| 122 | let cursor: CursorTarget = "idle"; |
| 123 | for (const [at, target] of moves) if (t >= at) cursor = target; |
| 124 | const click = press(BEAT.sessionClick) || press(BEAT.railChatClick) || press(BEAT.railDocsClick); |
| 125 | return { cursor, click }; |
| 126 | } |
| 127 | |
| 128 | /** The frame at time t (ms into the loop). */ |
| 129 | export function frameAt(time: number): Frame { |
| 130 | const t = ((time % LOOP_MS) + LOOP_MS) % LOOP_MS; |
| 131 | const scene: Scene = t >= BEAT.docs ? "docs" : t >= BEAT.chat ? "chat" : t >= BEAT.session ? "session" : "code"; |
| 132 | const { cursor, click } = cursorAt(t); |
| 133 | return { |
| 134 | scene, |
| 135 | checks: count(t, BEAT.check0, BEAT.checkGap, CHECKS.length), |
| 136 | diff: t >= BEAT.diff, |
| 137 | approved: t >= BEAT.approved, |
| 138 | merged: t >= BEAT.merged, |
| 139 | // The session was recorded before the story opens; the tour plays it back once its tab is opened. |
| 140 | entries: t < BEAT.session ? 0 : count(t, BEAT.entry0, BEAT.entryGap, SESSION.length), |
| 141 | shipped: t >= BEAT.shipped, |
| 142 | told: t >= BEAT.told, |
| 143 | docUpdated: t >= BEAT.docUpdated, |
| 144 | cursor, |
| 145 | click, |
| 146 | cursorShown: t >= BEAT.merged && t < BEAT.end - 600, |
| 147 | }; |
| 148 | } |
| 149 | |
| 150 | /** A still frame for each pill, for reduced motion: the moment the step makes its point. */ |
| 151 | export const STILLS: Record<Scene, number> = { |
| 152 | code: BEAT.approved + 200, |
| 153 | session: BEAT.railChatClick - 400, |
| 154 | chat: BEAT.told + 400, |
| 155 | docs: BEAT.docUpdated + 400, |
| 156 | }; |
| 157 | |
| 158 | /** Whether two frames would draw the same. */ |
| 159 | export function sameFrame(a: Frame, b: Frame): boolean { |
| 160 | for (const key of Object.keys(a) as (keyof Frame)[]) if (a[key] !== b[key]) return false; |
| 161 | return true; |
| 162 | } |