History: AI-driven alternate-history simulator
Pax Historia-style sim where the LLM is the world engine.
- React 19 + Vite 6 + Tailwind v4 + shadcn/ui frontend
- Express single-port backend (/api + /sse + built client + SPA fallback)
- SQLite (better-sqlite3) persistence, one row per game
- MapLibre choropleth map (OpenFreeMap dark + ISO_A3 regions)
- Defensive turn loop: strip fences, balanced-{} extract, parse, clamp 0-100,
retry-once nudge, generic 'unclear' fallback; never crashes on bad output
- 5 seed presets (wwii-1939, coldwar-1955, modern-2025, no-wwii-1940, aegis-2400)
- LLM client over native fetch w/ injectable transport (mesh-bot pattern);
LLM_STUB=1 deterministic transport for tests/e2e
- Unit (vitest, 19) + deterministic Playwright e2e
- Multi-stage node:22-slim Docker + Traefik (history.dev.kkhost.pl:4321)
Co-Authored-By: OpenCode <opencode@users.noreply.github.com>
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OpenCode
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# AGENTS.md — History
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Guidance for AI agents (and humans) working in this repo.
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## What this is
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A self-contained, AI-driven **alternate-history simulator** in the style of _Pax Historia_:
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the LLM is the world engine. You pick a scenario (one of 5 seed presets) and a nation to lead,
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then take actions / send diplomatic messages / ask an advisor; each move is sent to the model,
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which returns a structured `TurnResult` (events + stat/relation/territory deltas) that the engine
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validates, clamps, and applies to the world state. A MapLibre choropleth renders territorial
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ownership; the whole thing persists to SQLite and streams over SSE on a single port.
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## Stack
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- TypeScript everywhere, `strict: true`
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- Frontend: React 19 + Vite 6 + Tailwind CSS v4 (`@tailwindcss/vite`, no config file) + shadcn/ui
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- Backend: Node 22 + Express — one process serving the built client, `/api` (REST), and `/sse`
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- Persistence: `better-sqlite3` (one row per game, full `GameState` as JSON)
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- Map: MapLibre GL (`maplibre-gl`) — remote OpenFreeMap `dark` basemap + a country choropleth
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from `public/countries.geo.json` (`id` = ISO_A3)
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- The LLM client is a thin OpenAI chat-completions wrapper over native `fetch` with an
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**injectable transport** (mirrors `mesh-bot/src/llm`). A deterministic **stub** transport
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(`LLM_STUB=1`) is used by all tests/e2e.
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## Layout
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```
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history/
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├── AGENTS.md / README.md
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├── Dockerfile # multi-stage node:22-slim → single-port prod image
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├── docker-compose.yml # dev_net + 4 Traefik labels → history.dev.kkhost.pl
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├── eslint.config.js # flat config (ESLint 9)
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├── tsconfig.json # strict; aliases @/ → src/, @shared/ → shared/
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├── vite.config.ts # dev server + proxy /api,/sse → :4321; @ / @shared aliases
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├── vitest.config.ts # unit tests (server/**/*.test.ts)
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├── playwright.config.ts # deterministic e2e (webServer runs npm run dev, LLM_STUB=1)
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├── index.html
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├── presets/ # 5 scenario JSON files + index.json (manifest)
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├── public/
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│ └── countries.geo.json # 177 features, id=ISO_A3 (committed; Vite copies to dist/)
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├── shared/ # NO runtime deps — the single source of truth
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│ ├── types.ts # domain types (Nation, GameState, Preset, …)
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│ └── protocol.ts # LLM TurnResult schema + client↔server messages + pure helpers
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├── server/
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│ ├── index.ts # Express: /api/*, /sse/:id, static+SPA; reads PORT/LLM_*/DATA_DIR
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│ ├── engine.ts # pure: buildPrompt / parse+validate / applyTurnResult / runTurn / advisor
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│ ├── llm.ts # LlmClient (injectable transport) + env config
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│ ├── stub.ts # deterministic LLM transport (tests/e2e) + ADVISOR_MARKER
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│ ├── map.ts # GameState → RegionMap (ISO_A3 → owner + stable color)
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│ ├── presets.ts # load preset JSON files from disk
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│ ├── db.ts # SQLite open/save/load
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│ └── *.test.ts # unit tests (vitest)
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└── src/
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├── App.tsx # screen router: home → pick → game; owns game/regions/advisors state
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├── main.tsx # React root + ThemeProvider(dark)
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├── index.css # Tailwind v4 + dark "command-center" theme
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├── lib/
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│ ├── api.ts # same-origin REST helper (no hardcoded origin — proxy/Traefik safe)
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│ ├── sse.ts # useSse() hook (resync on connect; ref-based handlers)
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│ ├── colors.ts # event/relation/outcome → color maps
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│ └── utils.ts # cn()
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└── components/
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├── PresetPicker.tsx / NationSelect.tsx # home + nation pick screens
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├── WorldMap.tsx # MapLibre basemap + choropleth + click popup + player highlight
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├── NationPanel.tsx # a nation's stats/territory/diplomacy dossier
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├── ActionPanel.tsx # tabs: Action / Diplomacy / Advisor + "Jump forward"
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├── EventFeed.tsx # scrolling event log (newest first)
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├── StatBar.tsx
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└── ui/ # 14 shadcn/ui primitives
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```
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## Commands (run from repo root)
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| Command | What it does |
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|---|---|
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| `npm run dev` | Express on :4321 (tsx watch) + Vite on :5173 (proxies `/api`,`/sse`) concurrently |
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| `npm run build` | `vite build` (client → `dist/`) then `tsup server/index.ts` → `server/dist/index.js` |
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| `npm start` | run the compiled server (`node server/dist/index.js`) on :4321 |
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| `npm test` | vitest unit tests in `server/` (19 tests) |
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| `npm run typecheck` | `tsc --noEmit` (strict) across src/server/shared/e2e/configs |
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| `npm run lint` | ESLint flat config |
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| `npm run e2e` | Playwright, fully deterministic (`LLM_STUB=1`); overrides dev ports via `VITE_PORT`/`HISTORY_API_PORT` if set |
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| `docker compose up -d --build` | prod image on :4321, routed via Traefik at `history.dev.kkhost.pl` |
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## Conventions
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- **The server is authoritative.** All world state lives in SQLite (`server/db.ts`). The client
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renders state and sends intents (`/api/games/:id/turn|jump|advisor`); it never computes outcomes.
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`shared/protocol.ts` is the single source of truth for the LLM `TurnResult` and the
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client↔server message shapes — change it there first, then update both sides.
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- **No hardcoded origins.** The client uses same-origin relative paths (`/api/...`, `/sse/...`).
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In dev, Vite proxies them to :4321; in prod/Traefik they're the same origin. So the app works
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unchanged behind the proxy — never bake in `http://host:port`.
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- **Defensive turn handling, never crash.** `engine.runTurn` strips fences, extracts the first
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balanced `{...}`, `JSON.parse`s, validates (ignores invalid ops, clamps stats to 0–100), retries
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once with a nudge if the result is empty/invalid, and if it's still unusable emits a generic
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"unclear" event and advances. Bad model output never throws; only a transport/network error
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(model down) surfaces as an HTTP 502 to the client (shown as a toast).
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- **Stable per-nation colors.** `shared.nationColor(id)` hashes a nation id → hue, shared by the
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server's `RegionMap` and any client coloring so the choropleth always agrees.
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- **Deterministic stub.** `server/stub.ts` answers the model contract deterministically: the player
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nation's `military` is set to `(current + 5)` (clamped) each turn, one event is emitted
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(action→military, chat→diplomatic, jump→political "The world moves on"), it allies the player with
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the first other nation, and the date advances 2 days. Unit + e2e assertions rely on these exact
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values, so keep the stub deterministic.
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- Styling: Tailwind utility classes + shadcn/ui only; dark "command-center" theme (slate bg, amber
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primary, cyan accent). No CSS beyond the Tailwind import in `src/index.css`.
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## Deployment
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- Single Docker container (multi-stage `node:22-slim`): Express serves the built client, `/api`,
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and `/sse` on **one internal port, 4321**. `server/index.ts` `findRoot()` resolves the project
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root so `presets/`, `dist/`, and the `data/` (SQLite) paths work from the container layout.
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- Proxied by the shared Traefik (`dev_traefik`, see `../PROXY.md`) at
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**https://history.dev.kkhost.pl → container port 4321**. `docker-compose.yml` declares `dev_net`
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as an external network and the 4 mandatory labels (`traefik.enable`, router `Host(...)`,
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`entrypoints=web`, service `loadbalancer.server.port=4321`). **No TLS/certs in the labels** —
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the external proxy terminates TLS and forwards plain HTTP on the `web` entrypoint.
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- Game data persists on the `history-data` volume at `/app/data`.
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## LLM configuration (env)
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| Var | Default | Notes |
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|---|---|---|
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| `LLM_API_BASE` | `http://192.168.1.70:1111/v1` | OpenAI-compatible base URL |
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| `LLM_MODEL` | `qwen3.8-27b` | model id sent in the request body |
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| `LLM_TIMEOUT_MS` | `180000` | local 27B model can be slow |
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| `LLM_STUB` | _(unset = live)_ | `1` → deterministic stub transport (no model needed) |
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| `PORT` | `4321` | single server port |
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| `DATA_DIR` | `./data` | where `history.db` lives |
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| `CLIENT_DIST` | `./dist` | built client to serve (auto-found) |
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## Gotchas
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- **Live LLM is a runtime dependency.** If `192.168.1.70:1111` is down, turns return 502 (and the
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advisor degrades to a canned list). Set `LLM_STUB=1` for a fully functional offline instance.
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The map's remote OpenFreeMap style may fail to load without internet — the app still works, the
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choropleth just waits for `styledata`.
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- **Dev port override.** Vite defaults to :5173 → proxies to :4321. Both are overridable via
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`VITE_PORT` / `HISTORY_API_PORT` (the Playwright config reads them) so a run can dodge a port
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another project already holds. The client uses relative URLs, so it follows whichever port Vite
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binds.
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- **`@shared` vs `@` alias.** `shared/` lives at the repo **root** (a sibling of `src/`), not under
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`src/`. Imports must use `@shared/...` (or `../shared/` from `server/`). A bare `../shared/` from
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inside `src/` resolves to the nonexistent `src/shared/` — this was a real bug that `typecheck`
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caught.
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- **`better-sqlite3`** is the only native module; the Docker build relies on its prebuilt binary
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(works on `node:22-slim`/glibc). It's the sole `--external` in the tsup server bundle.
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- The `dist/` client is committed to the build output only; `public/countries.geo.json` is copied
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into `dist/` by Vite at build time, so the prod image serves it from `dist/` (no separate copy).
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