Files
station-master/src/sim/replay.ts
T

856 lines
37 KiB
TypeScript

/**
* Component 16 — Game replay viewer.
*
* Records one game and writes a **self-contained HTML file** that plays it back step by step.
*
* node src/sim/replay.ts [--seed 1234] [--length standard] [--out replay.html]
*
* The browser never runs the engine. Frames are precomputed here in Node and embedded as JSON, so
* the page is a dumb renderer with no bundling and no build step.
*
* The recorder drives `advance()` and `applyIntent()` itself rather than reusing `playGame`'s pump
* loop, because `pump` batches a whole automatic phase into one call — which would collapse an
* entire Mainline Phase into a single frame. Driving `advance` gives one frame per step.
*
* Priority is CLARITY over polish: plain boxes, words not symbols, and an explicit panel for what
* is currently blocked.
*/
import { writeFileSync } from 'node:fs';
import { advance } from '../engine/advance.ts';
import { applyIntent, areaOf, facilityCarType, laborersLeft, portersLeft } from '../engine/apply.ts';
import type { GameLength } from '../engine/content.ts';
import { MAINLINE_PROFILES, lengthProfile, officeProfile } from '../engine/content.ts';
import type { GameEvent } from '../engine/events.ts';
import type { Intent } from '../engine/intents.ts';
import { legalActions } from '../engine/legal.ts';
import { createGame } from '../engine/setup.ts';
import type { Facility, GameConfig, GameState } from '../engine/state.ts';
import { developerBot, lastChoiceReason } from './bot.ts';
import type { Impediment } from './narrate.ts';
import { carLabel, clockTime, idleNote, impediments, isVisible, narrate, phaseLabel } from './narrate.ts';
// ---------------------------------------------------------------------------
// Frame shape — only what the viewer draws
// ---------------------------------------------------------------------------
export type CellView = {
row: number;
col: number;
kind: string;
label: string;
running: boolean;
tray: string | null;
cars: string[];
facility: FacilityView | null;
};
export type FacilityView = {
name: string;
commodity: string;
flow: string;
green: string[];
greenCap: number;
maw: (string | null)[];
red: string[];
redCap: number;
track: string[];
trackCap: number;
laborers: string;
porters: string;
/**
* Can a load actually come off WORK onto a spotted car (§9.3)? A load with nowhere to go parks on
* WORK and LOCKS the industry track, blocking the very car that would clear it — the deadlock
* that held freight to a 3% completion rate.
*/
canFinish: boolean;
/** A load is sitting on WORK with no spotted car to receive it. */
jammed: boolean;
};
export type TrainChip = { label: string; consist: string[] };
export type DivisionView = { kind: string; label: string; trains: TrainChip[][] };
export type Frame = {
day: number;
stage: number;
clock: string;
phase: string;
actor: number | null;
superintendent: number;
revenue: number;
lines: { text: string; tone: string }[];
where: { row: number; col: number } | null;
/** Origin of a Move, so the crew's journey is visible rather than a chip teleporting. */
whereFrom: { row: number; col: number } | null;
division: DivisionView[];
cells: CellView[];
facilities: FacilityView[];
hand: string[];
deck: number;
departments: string[];
/** 12 slots; the train number due out at each Stage, or null. */
timetable: (number | null)[];
blocked: Impediment[];
trains: { label: string; where: string }[];
/** What the bot chose here, why, and what it passed over. Null on engine-driven frames. */
decision: Decision | null;
/** A Local Operations turn that changed nothing — the frames worth your attention. */
wasted: boolean;
};
/**
* The choice behind a frame.
*
* The whole point is `rejected`: the replay could always show what happened, never what COULD have
* happened, so a daft move was visible but the alternatives it passed over were not — which is
* exactly what you need to say what it should have done instead.
*/
export type Decision = {
actor: number;
chose: string;
why: string;
/** Every legal option not taken, grouped by kind with a count. */
rejected: { kind: string; count: number; detail: string }[];
totalOptions: number;
};
// ---------------------------------------------------------------------------
// Snapshotting
// ---------------------------------------------------------------------------
const FACILITY_NAMES: Record<string, string> = {
mineTipple: 'Mine Tipple',
produceShed: 'Produce Shed',
grocersWarehouse: "Grocer's Warehouse",
oilRefinery: 'Oil Refinery',
powerPlant: 'Power Plant',
};
function facilityView(
card: { geometry: { kind: string; facility?: string }; facility: unknown },
officeName: string,
): FacilityView | null {
const f = (card as { facility: import('../engine/state.ts').Facility | null }).facility;
// Passenger facilities were excluded entirely, so the Office's green and red slots never
// appeared — which is why stocking a coach into the green box looked like nothing happening.
if (!f) return null;
if (f.kind === 'passenger' && f.porters === 0 && f.capacity.outbound === 0) return null;
const key = card.geometry.kind === 'facility' ? (card.geometry.facility ?? '') : '';
return {
name: f.kind === 'passenger' ? officeName + ' (passengers)' : (FACILITY_NAMES[key] ?? key),
commodity: facilityCarType(f) ?? '?',
flow: f.kind === 'passenger'
? 'passengers on and off'
: f.allows.outbound && f.allows.inbound ? 'both' : f.allows.outbound ? 'ships out' : 'receives',
green: f.outboundBox.map(carLabel),
greenCap: f.capacity.outbound,
maw: f.menAtWork.map((l) => (l ? `${l.type} ${l.dir === 'out' ? '→' : '←'}` : null)),
red: f.inboundBox.map(carLabel),
redCap: f.capacity.inbound,
track: f.industryTrack.cars.map(carLabel),
trackCap: f.industryTrack.length,
laborers: `${laborersLeft(f)}/${f.laborers}`,
porters: `${portersLeft(f)}/${f.porters}`,
canFinish: canFinishHere(f),
jammed: f.menAtWork.some((l) => l !== null) && !canFinishHere(f),
};
}
/** Is a car spotted that a load on WORK could actually come off onto (§9.3)? */
function canFinishHere(f: Facility): boolean {
const pending = f.menAtWork.find((l) => l !== null) ?? f.outboundBox[0];
if (!pending) return false;
return f.industryTrack.cars.some((c) => !c.loaded && c.type === pending.type);
}
/**
* Summarise the choice: what was taken, why, and what was passed over.
*
* Options are grouped by kind because a switching turn can offer 40 destinations, and a list that
* long hides the shape of the decision rather than showing it.
*/
function describeDecision(
s: GameState,
actor: number,
chosen: Intent,
options: Intent[],
why: string,
): Decision {
const groups = new Map<string, Intent[]>();
for (const o of options) {
if (o === chosen) continue;
const list = groups.get(o.type) ?? [];
list.push(o);
groups.set(o.type, list);
}
const rejected = [...groups.entries()]
.map(([kind, list]) => ({ kind, count: list.length, detail: sampleDetail(s, kind, list) }))
.sort((a, b) => b.count - a.count);
return { actor, chose: describeIntent(s, chosen), why, rejected, totalOptions: options.length };
}
/** A short, concrete example of what a group of rejected options would have done. */
function sampleDetail(s: GameState, kind: string, list: Intent[]): string {
// Deduplicate by DESCRIPTION. Orientation variants and repeated copies of a card describe
// identically, so the raw list reads "play Overpass at (0,0)" three times over and hides the
// actual range of choices — the opposite of what this panel is for.
const seen = new Set<string>();
for (const i of list) seen.add(describeIntent(s, i));
const unique = [...seen];
const shown = unique.slice(0, 4);
const more = unique.length - shown.length;
return shown.join('; ') + (more > 0 ? ` … and ${more} more distinct` : '');
}
/** One readable line for a single intent. */
function describeIntent(s: GameState, i: Intent): string {
const at = (c: { row: number; col: number }): string => `(${c.row},${c.col})`;
switch (i.type) {
case 'localOps.choose':
return `choose ${i.option}`;
case 'card.play':
return `play ${cardName(s, i.cardId)}${i.placement ? ` at ${at(i.placement)}` : ''}`;
case 'card.discard':
return `discard ${cardName(s, i.cardId)}`;
case 'track.lay':
return `lay ${i.hand === 'none' ? '' : i.hand + '-hand '}${i.geometry} at ${at(i.placement)}`;
case 'switch.move':
return `move to ${at(i.to)}${i.reverse ? ' (reverse)' : ''}`;
case 'switch.dropCars':
return `drop ${i.count} car(s)`;
case 'switch.sortConsist':
return `re-order consist [${i.order.join(',')}]`;
case 'freightAgent.stockOutbound':
return `stock a ${i.carType} at ${at(i.at)}`;
case 'freightAgent.unjam':
return `unjam ${i.from} at ${at(i.at)}`;
case 'freightAgent.clearInbound':
return `clear red box at ${at(i.at)}`;
case 'laborer.startLoad':
return `start a load at ${at(i.at)}`;
case 'laborer.advanceLoad':
return `advance load in box ${i.box} at ${at(i.at)}`;
case 'laborer.beginUnload':
return `begin unloading car ${i.carIndex} at ${at(i.at)}`;
case 'porter.board':
return `board passengers at ${at(i.at)}`;
case 'porter.detrain':
return `detrain passengers at ${at(i.at)}`;
case 'newTrain.placeCar':
return `add ${i.loaded ? 'loaded' : 'empty'} ${i.carType}`;
case 'mainline.modify':
return `${cardName(s, i.cardId)} on Mainline card ${i.node}`;
case 'maneuver.redFlags':
return `Red Flags on ${i.trayId}`;
case 'maneuver.flyingSwitch':
return `Flying Switch ${i.count} car(s) into ${at(i.to)}`;
case 'mainline.clearance':
return i.allow ? 'grant clearance' : 'refuse clearance';
case 'draw.fromDepartment':
return `draw the face-up card in slot ${i.slot + 1}`;
default:
return i.type;
}
}
function snapshot(
s: GameState,
lines: { text: string; tone: string }[],
where: { row: number; col: number } | null,
whereFrom: { row: number; col: number } | null = null,
decision: Decision | null = null,
wasted = false,
): Frame {
const area = areaOf(s, 0);
const trayAt = new Map<string, string>();
for (const [id, tray] of s.trays) {
if (tray.position.at === 'grid') {
const label = tray.trainNumber === null ? 'crew' : `T${tray.trainIsExtra ? 'X' : ''}${tray.trainNumber}`;
const carrying = tray.consist.length ? ` [${tray.consist.map(carLabel).join(', ')}]` : ' [empty]';
trayAt.set(`${tray.position.coord.row},${tray.position.coord.col}`, label + carrying);
}
}
const cells: CellView[] = [];
const facilities: FacilityView[] = [];
for (const [key, card] of area.grid) {
const [row, col] = key.split(',').map(Number);
const g = card.geometry;
const kind = g.kind;
let label: string;
if (g.kind === 'office') label = officeProfile(area.tier).name;
else if (g.kind === 'limits') label = 'Limits';
else if (g.kind === 'facility') label = FACILITY_NAMES[g.facility] ?? g.facility;
else if (g.kind === 'modifier') label = MODIFIER_NAMES[g.modifier] ?? g.modifier;
else if (g.kind === 'spaceUse') label = prettyKey(g.key);
else label = g.geometry === 'sharpCurved' ? 'sharp curve' : g.geometry;
const fv = facilityView(card as never, officeProfile(area.tier).name);
if (fv) facilities.push(fv);
cells.push({
row: row!,
col: col!,
kind,
label,
running: row === area.runningRow,
tray: trayAt.get(key) ?? null,
cars: (card.facility?.industryTrack.length ? card.facility.industryTrack.cars : card.standing).map(carLabel),
facility: fv,
});
}
const division: DivisionView[] = s.division.nodes.map((n) => {
if (n.kind === 'divisionPoint') {
return {
kind: 'dp',
label: n.side === 'west' ? 'West DP' : 'East DP',
trains: [n.holding.map((id) => trainChip(s, id))],
};
}
if (n.kind === 'mainline') {
// Crossing time is in Stages now, so a Mainline card shows its terrain and the trains on it
// with how long each still has to run.
const name = MAINLINE_PROFILES.find((m) => m.kind === n.card)?.name ?? n.card;
return {
kind: 'ml',
label: name,
trains: [n.transits.map((t) => {
const chip = trainChip(s, t.tray);
return { ...chip, label: `${chip.label} (${t.stagesRemaining})` };
})],
};
}
return {
kind: 'office',
label: officeProfile(areaOf(s, n.owner).tier).name,
trains: [areaOf(s, n.owner).adOccupancy.map((id) => trainChip(s, id))],
};
});
return {
day: s.clock.day,
stage: s.clock.stage,
clock: clockTime(s.clock.stage),
phase: phaseLabel(s.clock.phase),
actor: s.clock.currentActor,
superintendent: s.clock.superintendent,
revenue: s.players[0]?.revenue ?? 0,
lines,
where,
whereFrom,
division,
cells,
facilities,
hand: (s.decks.hands.get(0) ?? []).map((id) => cardName(s, id)),
deck: s.decks.homeOffice.length,
departments: s.decks.departments.map((id) => (id ? cardName(s, id) : '—')),
timetable: [...s.timetable],
decision,
wasted,
blocked: impediments(s, 0),
trains: [...s.trays.values()].map((t) => ({
label: t.trainNumber === null ? 'local crew' : `Train ${t.trainIsExtra ? 'X' : ''}${t.trainNumber}`,
where:
t.position.at === 'divisionPoint'
? `${t.position.side} Division Point`
: t.position.at === 'mainline'
? `Mainline card ${t.position.index}`
: `Office Area (${t.position.coord.row},${t.position.coord.col})`,
})),
};
}
/** A card id turned into something a person can read. */
export function cardName(s: GameState, id: string): string {
const k = s.cards.get(id)?.kind;
if (!k) return 'a card';
switch (k.kind) {
case 'timetabledTrain':
return `Train ${k.number}`;
case 'extraTrain':
return `Extra X${k.number}`;
case 'office':
return `${k.tier.replace(/([A-Z])/g, ' $1').replace(/^./, (c) => c.toUpperCase())} upgrade`;
case 'freightFacility':
return FACILITY_NAMES[k.facility] ?? k.facility;
case 'modifier':
return MODIFIER_NAMES[k.modifier] ?? k.modifier;
case 'track':
return k.geometry === 'sharpCurved' ? 'Sharp curve' : `${k.geometry} track`;
case 'spaceUse':
case 'enhancement':
case 'mainlineModifier':
case 'maneuver':
case 'action':
return prettyKey(k.key);
}
}
/** camelCase key → readable name, for the card categories that carry only a key. */
function prettyKey(key: string): string {
return key.replace(/([A-Z])/g, ' $1').replace(/^./, (c) => c.toUpperCase());
}
const MODIFIER_NAMES: Record<string, string> = {
teamTrack: 'Team Track',
loadingDock: 'Loading Dock',
storageShed: 'Storage Shed',
extraPlatform: 'Extra Platform',
sectionGang: 'Section Gang',
};
/** A train on the board, with what it is carrying — otherwise a run looks identical empty or full. */
function trainChip(s: GameState, id: string): TrainChip {
const t = s.trays.get(id);
if (!t) return { label: id, consist: [] };
return {
label: t.trainNumber === null ? 'crew' : `T${t.trainIsExtra ? 'X' : ''}${t.trainNumber}`,
consist: t.consist.map(carLabel),
};
}
// ---------------------------------------------------------------------------
// Recording
// ---------------------------------------------------------------------------
export type Recording = { seed: number; length: GameLength; frames: Frame[]; outcome: string };
export function record(seed: number, length: GameLength, maxSteps = 100_000): Recording {
const config: GameConfig = {
mode: 'solitaire',
victory: 'highestAfterDays',
length,
optionalRules: {
reducedVisibility: false,
sisterTrains: false,
employeeRotation: false,
emergencyToolbox: false,
},
};
const s = createGame({ id: `replay-${seed}`, seed, config, playerNames: ['player'] });
const frames: Frame[] = [];
const narrateCtx = { cardName: (id: string) => cardName(s, id) };
// Tracks whether a phase did anything, so an empty one can say so rather than ending silently.
let didSomething = false;
// The choice that produced the events about to be pushed.
let pendingDecision: Decision | null = null;
const push = (events: GameEvent[]): void => {
const visible = events.filter(isVisible);
if (visible.length === 0) return;
const lines: { text: string; tone: string }[] = [];
for (const e of visible) {
if (e.type === 'phaseBegan') didSomething = false;
if (e.type === 'phaseEnded' && !didSomething) {
lines.push({ text: idleNote(e.phase), tone: 'quiet' });
}
if (
e.type !== 'phaseBegan' &&
e.type !== 'phaseEnded' &&
e.type !== 'stageBegan'
) {
didSomething = true;
}
const n = narrate(e, narrateCtx);
lines.push({ text: n.text, tone: n.tone });
}
const where = visible.map((e) => narrate(e, narrateCtx)).find((n) => n.where)?.where ?? null;
const moved = visible.find((e) => e.type === 'trayMoved');
const from = moved && moved.type === 'trayMoved' ? moved.from : null;
const d = pendingDecision;
pendingDecision = null;
// A Local Operations turn that ended with nothing but the turn ending is a wasted action —
// six Moves and a card play spent on nothing. Among 600+ frames these are invisible unless
// marked, and they are the ones worth reviewing.
const wasted =
d !== null &&
(d.chose === 'switch.end' || d.chose === 'draw.end' || d.chose === 'loadUnload.end') &&
visible.every((e) => e.type === 'phaseEnded' || e.type === 'actorChanged');
frames.push(snapshot(s, lines, where ?? null, from, d, wasted));
};
frames.push(
snapshot(s, [{ text: 'Game begins — the Division has just been spiked down.', tone: 'clock' }], null),
);
for (let step = 0; step < maxSteps; step++) {
const r = advance(s);
push(r.events);
if (s.status === 'finished') break;
if (!r.needsInput) continue;
const actor = s.clock.pendingDecision !== null ? s.clock.superintendent : s.clock.currentActor;
if (actor === null) break;
const options = legalActions(s, actor);
if (options.length === 0) break;
const chosen = developerBot.choose(s, actor, options);
const decision = describeDecision(s, actor, chosen, options, lastChoiceReason());
const applied = applyIntent(s, actor, chosen);
if (!applied.ok) break;
pendingDecision = decision;
push(applied.events);
}
const o = s.outcome;
return {
seed,
length,
frames,
outcome: o ? `${o.result}${o.reason} · final Revenue ${s.players[0]?.revenue ?? 0}` : 'unfinished',
};
}
// ---------------------------------------------------------------------------
// HTML
// ---------------------------------------------------------------------------
export function renderHtml(rec: Recording): string {
const target = lengthProfile(rec.length);
return `<!doctype html>
<html lang="en"><head><meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>Station Master — replay seed ${rec.seed}</title>
<style>
:root{--bg:#14161a;--fg:#e8e6e3;--dim:#8b9199;--line:#2c3138;--panel:#1b1f25;
--good:#5fd08a;--bad:#ff7a70;--clock:#7fb8ff;--warn:#ffc46b;--green:#2f6b47;--red:#6b3230;--maw:#2a4a6b}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:13px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace}
header{padding:10px 14px;border-bottom:1px solid var(--line);position:sticky;top:0;background:var(--bg);z-index:5}
h1{font-size:14px;margin:0 0 6px;font-weight:600}
.bar{display:flex;gap:18px;flex-wrap:wrap;align-items:baseline}
.big{font-size:19px;font-weight:700}
.dim{color:var(--dim)}
.wrap{display:grid;grid-template-columns:minmax(0,3fr) minmax(0,2fr);gap:14px;padding:14px}
@media(max-width:900px){.wrap{grid-template-columns:1fr}}
section{background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:10px 12px;margin-bottom:14px}
h2{font-size:11px;letter-spacing:.09em;text-transform:uppercase;color:var(--dim);margin:0 0 8px;font-weight:600}
.div-strip{display:flex;gap:6px;overflow-x:auto;padding-bottom:4px}
.node{border:1px solid var(--line);border-radius:5px;padding:6px 8px;min-width:96px;background:#20252c}
.node.office{border-color:var(--clock)}
.regions{display:flex;gap:4px;margin-top:5px}
.region{flex:1;min-height:22px;border:1px dashed var(--line);border-radius:3px;display:flex;align-items:center;justify-content:center;font-size:11px}
.chip{background:var(--clock);color:#0d1117;border-radius:3px;padding:1px 5px;font-weight:700;font-size:11px}
.grid{display:grid;gap:5px;overflow-x:auto}
.cell{border:1px solid var(--line);border-radius:5px;padding:6px;min-height:64px;background:#20252c}
.cell.run{border-color:#4a545f;background:#252b33}
.cell.hl{outline:2px solid var(--warn);outline-offset:1px}
.cell.from{outline:2px dashed #6b7480;outline-offset:1px}
/* The crew is the thing you follow around the yard, so it gets the loudest treatment on the card. */
.crew{background:var(--warn);color:#0d1117;font-weight:700;border-radius:4px;padding:3px 6px;
margin-top:5px;font-size:11px;line-height:1.35}
.cell .nm{font-weight:700;font-size:11px}
.cell .cars{color:var(--dim);font-size:10.5px;margin-top:3px}
.cell .tray{display:inline-block;margin-top:4px}
.fac{border:1px solid var(--line);border-radius:5px;padding:8px;margin-bottom:8px;background:#20252c}
.boxes{display:flex;gap:6px;flex-wrap:wrap;margin-top:6px;align-items:center}
.box{border-radius:3px;padding:3px 7px;font-size:11px;border:1px solid var(--line)}
.box.g{background:var(--green)}.box.r{background:var(--red)}.box.m{background:var(--maw)}
.box.empty{background:transparent;color:var(--dim)}
.log{max-height:230px;overflow:auto}
.line{padding:2px 0;border-bottom:1px solid #23272e}
.t-good{color:var(--good)}.t-bad{color:var(--bad)}.t-clock{color:var(--clock);font-weight:700}
.t-quiet{color:var(--dim)}.t-plain{color:var(--fg)}
.blocked li{margin-bottom:4px}
.sev-stuck{color:var(--bad)}.sev-risk{color:var(--warn)}.sev-waiting{color:var(--dim)}
/* FIXED, not sticky: a sticky footer shifts as panel heights change, so the mouse cannot stay
parked on one button and keep clicking. */
footer{position:fixed;left:0;right:0;bottom:0;background:var(--bg);border-top:1px solid var(--line);
padding:9px 14px;display:flex;gap:8px;align-items:center;flex-wrap:nowrap;z-index:10;overflow-x:auto}
body{padding-bottom:64px}
button{background:#2a3038;color:var(--fg);border:1px solid var(--line);border-radius:5px;padding:5px 11px;
font:inherit;cursor:pointer}
button:hover{background:#343b45}
input[type=range]{flex:1;min-width:180px}
.legend{font-size:11px;color:var(--dim);padding:0 14px 14px}
kbd{background:#2a3038;border:1px solid var(--line);border-radius:3px;padding:0 4px;font-size:10px}
.tt{display:grid;grid-template-columns:repeat(12,1fr);gap:3px}
.tt div{border:1px solid var(--line);border-radius:3px;padding:3px 2px;text-align:center;font-size:10.5px}
.tt div.due{background:var(--clock);color:#0d1117;font-weight:700}
.tt div.now{outline:2px solid var(--warn)}
.card{display:inline-block;border:1px solid var(--line);border-radius:3px;padding:1px 6px;margin:2px 3px 0 0;font-size:11px;background:#20252c}
.consist{font-size:10px;color:var(--dim);margin-top:2px}
.mini{margin-top:4px;font-size:9.5px;line-height:1.8}
.mini .box{padding:0 4px;font-size:9.5px}
.cell.office{border-color:var(--clock)}
.cell.modifier{border-style:dashed;opacity:.85}
.chose{font-size:15px;margin-bottom:4px}
.why{font-style:italic;opacity:.85;margin-bottom:2px}
.rejected{list-style:none;margin:0;padding:0;max-height:210px;overflow:auto}
.rejected li{padding:3px 0;border-top:1px solid rgba(128,128,128,.25);font-size:12px}
.wasted{background:#b03030;color:#fff;font-weight:bold;padding:3px 6px;margin-bottom:5px;border-radius:3px}
.fstat{margin-top:4px;font-size:11px;padding:2px 5px;border-radius:3px;display:inline-block}
.fstat.good{background:rgba(40,140,60,.28)}
.fstat.bad{background:rgba(190,50,50,.38);font-weight:bold}
.fstat.idle{opacity:.6}
.wastedmark{color:#e06060;font-weight:bold}
</style></head><body>
<header>
<h1>Station Master — replay · seed ${rec.seed} · ${rec.length} (target ${target.target} over ${target.days} Days) · ${esc(rec.outcome)}</h1>
<div class="bar">
<span class="big" id="when">—</span>
<span>phase <b id="phase">—</b></span>
<span class="dim">actor <span id="actor">—</span> · fedora <span id="super">—</span></span>
<span>revenue <b class="big" id="rev">0</b></span>
<span class="dim">deck <span id="deck">0</span></span>
<span class="dim">frame <span id="fno">0</span>/<span id="ftot">0</span></span>
</div>
</header>
<div class="wrap">
<div>
<section><h2>Division — west to east</h2><div class="div-strip" id="division"></div></section>
<section><h2>Office Area</h2><div class="grid" id="grid"></div></section>
<section><h2>Facilities</h2><div id="facs"></div></section>
<section><h2>Timetable — which train is due out at each Stage</h2><div id="tt"></div></section>
</div>
<div>
<section><h2>What just happened</h2><div id="now"></div></section>
<section><h2>Decision — what it chose, and what it passed over</h2><div id="decision"></div></section>
<section><h2>Cards</h2>
<div><span class="dim">your hand:</span> <span id="hand">—</span></div>
<div style="margin-top:5px"><span class="dim">face-up Department slots:</span> <span id="depts">—</span></div>
</section>
<section><h2>Blocked — why nothing is moving</h2><ul class="blocked" id="blocked"></ul></section>
<section><h2>Trains in play</h2><div id="trains" class="dim"></div></section>
<section><h2>History</h2><div class="log" id="log"></div></section>
</div>
</div>
<div class="legend">
<b>Keyboard:</b> <kbd>←</kbd>/<kbd>→</kbd> step · <kbd>space</kbd> play/pause ·
<kbd>Home</kbd>/<kbd>End</kbd> first/last · <kbd>S</kbd> next Stage · <kbd>R</kbd> next revenue change ·
<kbd>C</kbd> next collision · <kbd>W</kbd> next wasted turn · <kbd>J</kbd> next jam.<br>
Running Track is the lighter row. <span class="chip">T4</span> is a train on the Division;
<span style="background:var(--warn);color:#0d1117;font-weight:700;border-radius:3px;padding:0 4px">🚂 T4</span>
is the crew in your yard — it carries the whole train with it as it moves, and a dashed outline
marks where it came from. Green box = outbound loads waiting ·
MEN / AT / WORK = the three-step loading track (→ outbound, ← inbound) · red box = delivered loads.
Laborers and Porters show remaining/total for this Stage.
</div>
<footer>
<button id="first">⏮ start</button>
<button id="back">◀ step</button>
<button id="play">▶ play</button>
<button id="fwd">step ▶</button>
<button id="stage">next Stage ⏭</button>
<button id="money">next revenue 💰</button>
<button id="crash">next collision ⚠</button>
<button id="waste">next wasted turn 🗑</button>
<button id="jam">next jam 🔒</button>
<input type="range" id="scrub" min="0" value="0">
<select id="speed">
<option value="3000">extra slow</option>
<option value="1200">slow</option>
<option value="250" selected>normal</option>
<option value="90">fast</option>
<option value="20">very fast</option>
</select>
</footer>
<script>
const FRAMES = ${JSON.stringify(rec.frames)};
let i = 0, timer = null;
const $ = (id) => document.getElementById(id);
const esc = (s) => String(s).replace(/[&<>]/g, (c) => ({'&':'&amp;','<':'&lt;','>':'&gt;'}[c]));
// The green / MEN|AT|WORK / red boxes drawn on the card itself, so a Freight Agent action or a
// Porter boarding shows up where it happened rather than only in a side panel.
function miniFacility(x) {
let h = '<div class="mini">';
if (x.greenCap > 0) h += '<span class="dim">grn </span>' + boxes(x.green, x.greenCap, 'g');
if (x.trackCap > 0) h += '<br><span class="dim">work </span>' +
x.maw.map((m) => '<span class="box ' + (m ? 'm' : 'empty') + '">' + (m ? esc(m) : '·') + '</span>').join('');
if (x.redCap > 0) h += '<br><span class="dim">red </span>' + boxes(x.red, x.redCap, 'r');
return h + '</div>';
}
function boxes(items, cap, cls) {
let h = '';
for (let k = 0; k < Math.max(cap, items.length); k++) {
const v = items[k];
h += '<span class="box ' + (v ? cls : 'empty') + '">' + (v ? esc(v) : '·') + '</span>';
}
return h || '<span class="dim">—</span>';
}
function render() {
const f = FRAMES[i];
$('when').textContent = 'Day ' + f.day + ' · Stage ' + f.stage + ' · ' + f.clock;
$('phase').textContent = f.phase;
$('actor').textContent = f.actor === null ? 'automatic' : 'P' + f.actor;
$('super').textContent = 'P' + f.superintendent;
$('rev').textContent = f.revenue;
$('rev').className = 'big ' + (f.revenue < 0 ? 't-bad' : f.revenue > 0 ? 't-good' : '');
$('deck').textContent = f.deck;
$('hand').innerHTML = f.hand.length
? f.hand.map((c) => '<span class="card">' + esc(c) + '</span>').join('')
: '<span class="dim">empty</span>';
$('depts').innerHTML = f.departments.map((c) => '<span class="card">' + esc(c) + '</span>').join('');
$('tt').innerHTML = '<div class="tt">' + f.timetable.map((t, k) =>
'<div class="' + (t !== null ? 'due ' : '') + (k + 1 === f.stage ? 'now' : '') + '">' +
'S' + (k + 1) + '<br>' + (t !== null ? 'T' + t : '·') + '</div>').join('') + '</div>' +
'<div class="dim" style="margin-top:5px">The NUMBER of a train is its seniority and direction ' +
'(odd = westbound, even = eastbound). The Stage it departs is set by a 1D12 roll when its card ' +
'was played — so Train 8 leaving at Stage 6 is normal.</div>';
$('fno').textContent = i;
$('scrub').value = i;
$('division').innerHTML = f.division.map((n) =>
'<div class="node ' + (n.kind === 'office' ? 'office' : '') + '"><div class="nm">' + esc(n.label) + '</div>' +
'<div class="regions">' + n.trains.map((r) =>
'<div class="region">' + r.map((t) =>
'<span class="chip">' + esc(t.label) + '</span>' +
'<div class="consist">' + (t.consist.length ? esc(t.consist.join(', ')) : 'empty') + '</div>'
).join('') + '</div>').join('') +
'</div></div>').join('');
const rows = f.cells.map((c) => c.row), cols = f.cells.map((c) => c.col);
const r0 = Math.min(...rows), r1 = Math.max(...rows), c0 = Math.min(...cols), c1 = Math.max(...cols);
const g = $('grid');
g.style.gridTemplateColumns = 'repeat(' + (c1 - c0 + 1) + ', minmax(110px, 1fr))';
let cellsHtml = '';
for (let r = r1; r >= r0; r--) {
for (let c = c0; c <= c1; c++) {
const cell = f.cells.find((x) => x.row === r && x.col === c);
if (!cell) { cellsHtml += '<div></div>'; continue; }
const hl = f.where && f.where.row === r && f.where.col === c;
const wasHere = f.whereFrom && f.whereFrom.row === r && f.whereFrom.col === c;
cellsHtml += '<div class="cell ' + (cell.running ? 'run ' : '') + (cell.kind === 'office' ? 'office ' : '') +
(cell.kind === 'modifier' ? 'modifier ' : '') + (hl ? 'hl ' : '') + (wasHere ? 'from' : '') + '">' +
'<div class="nm">' + esc(cell.label) + '</div>' +
'<div class="dim" style="font-size:10px">(' + r + ',' + c + ')</div>' +
(cell.tray ? '<div class="crew">🚂 ' + esc(cell.tray) + '</div>' : '') +
(cell.facility ? miniFacility(cell.facility) : '') +
(cell.cars.length ? '<div class="cars">siding: ' + cell.cars.map(esc).join('<br>') + '</div>' : '') +
'</div>';
}
}
g.innerHTML = cellsHtml;
$('facs').innerHTML = f.facilities.length === 0
? '<span class="dim">no freight facilities built yet</span>'
: f.facilities.map((x) =>
'<div class="fac"><b>' + esc(x.name) + '</b> <span class="dim">' + esc(x.commodity) + ' · ' + esc(x.flow) +
' · laborers ' + esc(x.laborers) + ' · porters ' + esc(x.porters) + '</span>' +
'<div class="boxes"><span class="dim">green</span>' + boxes(x.green, x.greenCap, 'g') + '</div>' +
'<div class="boxes"><span class="dim">MEN|AT|WORK</span>' +
x.maw.map((m) => '<span class="box ' + (m ? 'm' : 'empty') + '">' + (m ? esc(m) : '·') + '</span>').join('') + '</div>' +
'<div class="boxes"><span class="dim">red</span>' + boxes(x.red, x.redCap, 'r') + '</div>' +
'<div class="boxes"><span class="dim">siding</span>' + boxes(x.track, x.trackCap, 'g') + '</div>' +
'<div class="fstat ' + (x.jammed ? 'bad' : (x.canFinish ? 'good' : 'idle')) + '">' +
(x.jammed
? 'JAMMED — a load is on WORK with no car spotted to receive it; the industry track is locked'
: (x.canFinish
? 'ready — a matching empty car is spotted, so a load can finish'
: 'no car spotted — starting a load here would jam it')) +
'</div>' +
'</div>').join('');
$('now').innerHTML = f.lines.map((l) => '<div class="line t-' + l.tone + '">' + esc(l.text) + '</div>').join('');
var d = f.decision;
if (!d) {
$('decision').innerHTML = '<span class="dim">no choice here — the engine advanced on its own</span>';
} else {
var h = '';
if (f.wasted) h += '<div class="wasted">WASTED TURN — the whole action produced no change</div>';
h += '<div class="chose"><span class="dim">chose:</span> <b>' + esc(d.chose) + '</b></div>';
h += '<div class="why">why: ' + esc(d.why) + '</div>';
h += '<div class="dim" style="margin:6px 0 3px">passed over ' + (d.totalOptions - 1) +
' other legal option' + ((d.totalOptions - 1) === 1 ? '' : 's') + ':</div>';
if (d.rejected.length === 0) h += '<div class="dim">none — this was the only legal action</div>';
else h += '<ul class="rejected">' + d.rejected.map(function (r) {
return '<li><b>' + esc(r.kind) + '</b> <span class="dim">x' + r.count + '</span><br>' +
'<span class="dim">' + esc(r.detail) + '</span></li>';
}).join('') + '</ul>';
$('decision').innerHTML = h;
}
$('blocked').innerHTML = f.blocked.length === 0
? '<li class="dim">nothing blocked</li>'
: f.blocked.map((b) => '<li class="sev-' + b.severity + '"><b>' + esc(b.where) + '</b> — ' + esc(b.why) + '</li>').join('');
$('trains').innerHTML = f.trains.length === 0
? 'no trains running'
: f.trains.map((t) => esc(t.label) + ' — ' + esc(t.where)).join('<br>');
let hist = '';
for (let k = Math.max(0, i - 24); k <= i; k++) {
for (const l of FRAMES[k].lines) hist += '<div class="line t-' + l.tone + '">' + esc(l.text) + '</div>';
}
$('log').innerHTML = hist;
$('log').scrollTop = $('log').scrollHeight;
}
function go(n) { i = Math.max(0, Math.min(FRAMES.length - 1, n)); render(); }
function findNext(pred) { for (let k = i + 1; k < FRAMES.length; k++) if (pred(FRAMES[k], FRAMES[k - 1])) return go(k); go(FRAMES.length - 1); }
$('ftot').textContent = FRAMES.length - 1;
$('scrub').max = FRAMES.length - 1;
$('scrub').oninput = (e) => go(+e.target.value);
$('first').onclick = () => go(0);
$('back').onclick = () => go(i - 1);
$('fwd').onclick = () => go(i + 1);
$('stage').onclick = () => findNext((f, p) => f.stage !== p.stage || f.day !== p.day);
$('money').onclick = () => findNext((f, p) => f.revenue !== p.revenue);
$('crash').onclick = () => findNext((f) => f.lines.some((l) => /COLLISION|collision/.test(l.text)));
$('waste').onclick = () => findNext((f) => f.wasted);
$('jam').onclick = () => findNext((f) => f.facilities.some((x) => x.jammed));
$('play').onclick = () => {
if (timer) { clearInterval(timer); timer = null; $('play').textContent = '▶ play'; return; }
$('play').textContent = '⏸ pause';
timer = setInterval(() => {
if (i >= FRAMES.length - 1) { clearInterval(timer); timer = null; $('play').textContent = '▶ play'; return; }
go(i + 1);
}, +$('speed').value);
};
$('speed').onchange = () => { if (timer) { $('play').click(); $('play').click(); } };
document.onkeydown = (e) => {
if (e.key === 'ArrowRight') go(i + 1);
else if (e.key === 'ArrowLeft') go(i - 1);
else if (e.key === 'Home') go(0);
else if (e.key === 'End') go(FRAMES.length - 1);
else if (e.key === 's' || e.key === 'S') $('stage').click();
else if (e.key === 'r' || e.key === 'R') $('money').click();
else if (e.key === 'c' || e.key === 'C') $('crash').click();
else if (e.key === 'w' || e.key === 'W') $('waste').click();
else if (e.key === 'j' || e.key === 'J') $('jam').click();
else if (e.key === ' ') { e.preventDefault(); $('play').click(); }
};
render();
</script></body></html>`;
}
function esc(s: string): string {
return s.replace(/[&<>]/g, (c) => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;' })[c] ?? c);
}
// ---------------------------------------------------------------------------
// CLI
// ---------------------------------------------------------------------------
const isMain = process.argv[1]?.endsWith('replay.ts') ?? false;
if (isMain) {
const arg = (name: string, dflt: string): string => {
const i = process.argv.indexOf(`--${name}`);
return i >= 0 ? (process.argv[i + 1] ?? dflt) : dflt;
};
const seed = Number(arg('seed', '1234'));
const length = arg('length', 'standard') as GameLength;
const out = arg('out', 'replay.html');
const rec = record(seed, length);
writeFileSync(out, renderHtml(rec));
const kb = (Buffer.byteLength(renderHtml(rec)) / 1024).toFixed(0);
console.log(`wrote ${out}${rec.frames.length} frames, ${kb} KB`);
console.log(`seed ${seed} · ${length} · ${rec.outcome}`);
}