# The Ladder

A turn-based career simulation game that runs entirely in the browser. You
start at the bottom of an organisation and play turns — a day at a time —
making choices that move your money, your skills and your standing with the
people around you. There is no win state and no game over: a bad run means
worse options, not an ending, and you can stop whenever you like and read the
retrospective.

The engine knows nothing about offices, mailrooms or bosses. A **setting is a
content pack** — characters, events, choices, stat names and tuning, all data.
`corporateladder` is the default pack; a Wild West or lemonade-stand pack would
be new data and no new code.

## Status

Engine and the first content pack are built and tested. No UI yet — the game is
currently playable only from a test harness.

| Piece | State |
| --- | --- |
| Path-addressed state, conditions, effects | done |
| Seeded RNG, save/resume | done |
| Event selection, option gating | done |
| Turn loop, per-turn upkeep | done |
| Content validator + reachability tests | done |
| Corporate Ladder pack — 17 events, 2 characters | done |
| Turn screen, retrospective, feedback widget | done |
| Local-storage save, file export/import | done |
| Single-file build | done |
| Calendar, scheduled wages and rent | done |
| Played in a real browser | done — first playtest 2026-09-09 |

The first playtest confirmed the interface, saves and the exported log all work
in a real browser. Its findings — an unexplained daily drain, no sense of the
week, and an economy nobody could get ahead in — are what the calendar and the
retuned economy are for.

Note that the development machine has no browser that can render a page, so the
UI tests drive the real modules against a minimal fake DOM. That covers wiring,
not layout: **styling and dark mode are only ever verified by a human opening
it.**

## Playing it

```sh
npm run serve     # then open http://localhost:8080
```

A server is needed during development because browsers refuse ES module imports
over `file://`. If port 8080 is taken, run `python3 -m http.server <port>`
instead.

To hand the game to someone else:

```sh
npm run build     # writes dist/theladder.html
```

That is one self-contained file with the stylesheet and every module inlined.
It plays by double-clicking it — no server, no network, nothing installed.

```sh
npm test          # 109 tests: engine, content, UI wiring, and the build
```

There are no runtime dependencies and no build step for development. Node is
used only to run the tests and the single-file build.

## Layout

```
src/engine/     the game engine — imports nothing from content/, or from src/ui/
  paths.js        dotted-path get/set over state
  conditions.js   generic predicates: { path, op, value }, all/any/not
  effects.js      generic mutations: add/set/push/remove, with clamping
  state.js        pack -> schema and initial state
  select.js       which event fires this turn, which options are available
  game.js         the turn loop
  rng.js          seeded, serializable RNG
  validate.js     load-time content checking
src/ui/         screens, formatting and the app controller
  app.js          the only module that names a content pack
  screens/        the turn screen and the retrospective
  format.js       state paths and conditions rendered as English
src/io/         local-storage save, file export/import, the feedback log
content/        content packs (settings)
tools/build.js  flattens everything into one self-contained HTML file
test/           engine tests against a fixture pack; content and UI tests
docs/           DECISIONS.md — why things are the way they are
Planning/       the original design documents
```

**The rule that keeps this honest: nothing in `src/engine/` may import from
`content/`.** The engine names no stat, no character and no setting of its own.

## How content works

A pack declares what state exists and what it starts at, the relationship stats
every character carries, the characters, and the events. Everything else falls
out of that.

```js
export default {
  id: 'corporateladder',
  startingStage: 'mailroom',

  state: {
    'money': { initial: 1200, min: -5000, max: 1000000 },
    'skills.negotiation': { initial: 1, min: 0, max: 100 },
    'flags.took_loan': { initial: false },
  },

  // Expanded per character into relationships.<id>.<stat>, so adding a
  // character adds its relationship state automatically.
  relationshipStats: {
    likes_you: { initial: 50, min: 0, max: 100 },
    fears_you: { initial: 50, min: 0, max: 100 },
    wants_to_help_you: { initial: 50, min: 0, max: 100 },
  },

  characters: [
    { id: 'boss', name: '...', role_type: 'boss', description: '...' },
  ],

  events: [
    {
      id: 'mail_run',
      stage: 'mailroom',
      weight: 100,                 // relative likelihood among eligible events
      description: 'A cart of mail and two hours to move it.',
      options: [
        {
          id: 'hustle',
          label: 'Get it done fast.',
          requires: [{ path: 'skills.negotiation', op: '>=', value: 3 }],
          effects: [
            { path: 'money', op: 'add', value: 40 },
            { path: 'relationships.boss.likes_you', op: 'add', value: 3 },
          ],
        },
      ],
    },
  ],
};
```

An event may also carry `once: true`, a `cooldown` in turns, and `requires`
conditions of its own. There is no separate notion of a random event: every
turn draws from the whole eligible pool by weight.

Conditions may read engine bookkeeping (`turn`, `stage`, `seen.<eventId>`,
`lastSeen.<eventId>`) as well as pack state. Effects may not write it.

A pack also declares `upkeep` — a list of `{ label, requires?, effects }`
applied at the end of a turn, after the choice. Adding `every` and `offset`
makes an entry periodic rather than daily: Corporate Ladder pays wages on
alternate Fridays (`{ every: 14, offset: 4 }`), charges rent every Monday, and
adds a loan service charge that steps up as the debt grows.

A pack may also declare a `calendar`:

```js
calendar: {
  cycleLength: 7,
  cycleName: 'Week',
  unitNames: ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday'],
},
```

The engine derives `calendar.index`, `calendar.cycle` and `calendar.name` from
the turn number before each event is drawn, so content can require a Friday and
the interface can title the turn. Declare no calendar and there is no week.

Run `validatePack(pack)` when loading in development — it catches undeclared
paths, unknown characters, unusable ids, unreachable events and stages with no
fallback event, all of which otherwise fail silently mid-playthrough.