# Star Wars – Wild Space

Exploitable ring only (outer Ø100, inner Ø60). Planet positions are deterministic from the **server world seed**; **stats stay hidden** until you click a tile. Reveals are **persisted in PostgreSQL**.

> **Desktop only** — the galaxy map is not playable on phones or narrow screens (< 768 px wide).

---

## Table of contents

1. [Architecture](#architecture)
2. [Prerequisites](#prerequisites)
3. [Deploy on a new server](#deploy-on-a-new-server)
4. [Environment variables](#environment-variables)
5. [Runtime config (`game.settings.json`)](#runtime-config-gamesettingsjson)
6. [Local development (without Docker)](#local-development-without-docker)
7. [UI layout](#ui-layout)
8. [Game mechanics](#game-mechanics)
9. [API reference](#api-reference)
10. [Docker image notes](#docker-image-notes)
11. [Database persistence](#database-persistence)

---

## Architecture

| Component | Technology |
|-----------|-----------|
| Web server / API | Node.js 20 + Express |
| Game database | PostgreSQL 16 (`star_wars_grid`) |
| Users database | PostgreSQL 16 (`star_wars_users`) |
| Auth | JWT (7-day tokens, signed with `JWT_SECRET`) |
| Config hot-reload | File mtime polling (`game.settings.json`) |
| Economy engine | Server-side tick loop (every 5 s) |
| Container runtime | Docker / Docker Compose |

The app runs as a single Node process that serves both the static frontend (`public/`) and the REST API (`/api/*`). Two separate PostgreSQL instances hold game state and user accounts respectively.

---

## Prerequisites

| Requirement | Minimum version |
|-------------|----------------|
| Docker Engine | 24+ |
| Docker Compose plugin | v2 (`docker compose`) |
| Git | any recent |

No Node.js or PostgreSQL installation is needed on the host — everything runs inside Docker.

---

## Deploy on a new server

### 1 — Clone the repository

```bash
git clone <repo-url> star-wars-wild-space
cd star-wars-wild-space
```

### 2 — Create the environment file

```bash
cp .env.example .env
```

Open `.env` and set every value — see [Environment variables](#environment-variables) for details. At a minimum you **must** change:

- `JWT_SECRET` — generate a strong random string:
  ```bash
  node -e "console.log(require('crypto').randomBytes(48).toString('hex'))"
  ```

  You may use alternatives for Linux-based distros, like this OpenSSL one:
  ```bash
  openssl rand -hex 48
  ```

  Or even lower-level tools from Linux/UNIX entropy pool:
  ```bash
  head -c 48 /dev/urandom | xxd -p -c 48
  # or
  head -c 48 /dev/urandom | hexdump -e '48/1 "%02x"'
  ```
- `POSTGRES_PASSWORD`
- `POSTGRES_USERS_PASSWORD`

### 3 — Review the game config

`config/game.settings.json` is mounted into the container and hot-reloaded at runtime. Adjust values before first boot if needed — see [Runtime config](#runtime-config-gamesettingsjson).

### 4 — Create the data directories

Docker bind-mounts the PostgreSQL data directories from the host. Create them before the first run so that Docker does not create them as root:

```bash
mkdir -p data/postgres data/postgres_users
```

### 5 — Build and start

```bash
docker compose up --build -d
```

The `app` service waits for both databases to pass their health checks before starting (pg_isready polling every 3 s, up to 15 retries). On first boot the server automatically creates all required tables.

### 6 — Verify the deployment

```bash
# Check all three containers are running
docker compose ps

# Tail logs
docker compose logs -f app

# Health check (should return JSON)
curl http://localhost:8080/api/config
```

Open `http://<server-ip>:8080` in a browser.

### 7 — (Optional) Reverse proxy

To expose the app on port 80/443, put Nginx or Caddy in front and proxy to `http://localhost:8080`. Set `CORS_ORIGIN` in `.env` to your public domain.

### Stopping / restarting

```bash
docker compose down          # stop (data preserved)
docker compose down -v       # stop and remove named volumes (data lost)
docker compose restart app   # restart only the app container
```

---

## Environment variables

**Never commit secrets.** All credentials live in **`.env`** (git-ignored). Copy from `.env.example` before the first run.

| Variable | Default | Description |
|----------|---------|-------------|
| `PORT` | `8080` | HTTP port exposed by the app |
| `JWT_SECRET` | *(required)* | Secret used to sign JWT tokens — use a long random string in production |
| `POSTGRES_USER` | `game` | Game-DB username |
| `POSTGRES_PASSWORD` | *(required)* | Game-DB password |
| `POSTGRES_DB` | `star_wars_grid` | Game-DB name |
| `POSTGRES_USERS_USER` | `users` | Users-DB username |
| `POSTGRES_USERS_PASSWORD` | *(required)* | Users-DB password |
| `POSTGRES_USERS_DB` | `star_wars_users` | Users-DB name |
| `CORS_ORIGIN` | `*` | Value of the `Access-Control-Allow-Origin` header — set to your public domain in production |

---

## Runtime config (`game.settings.json`)

Edit **`config/game.settings.json`** on the host (bind-mounted into the container at `/app/config/game.settings.json`). The server checks the file's **mtime** on a schedule; when it changes the new values are applied without a restart, within at most `configReloadIntervalSeconds` seconds (minimum 5 s).

### Core fields

| Field | Default | Meaning |
|-------|---------|---------|
| `clickCooldownSeconds` | `10` | Per-user cooldown in seconds between new tile reveals. `0` disables it. |
| `databaseWipeoutIntervalSeconds` | `21600` | World period length in seconds (6 h). The world seed is `swg-<slot>` where `slot = floor(UTC unix seconds / this value)`. When the slot advances, `grid_cells` is truncated and a new era begins. Minimum `60`. |
| `configReloadIntervalSeconds` | `30` | How often the server polls the config file; also used by the client to poll `/api/config`. Minimum `5`. |

### Economy fields

| Field | Meaning |
|-------|---------|
| `elementWorth` | Per-element multipliers (`common`, `food`, `petrol`, `goods`, `industry`, `medic`, `money`, `science`). |
| `resourceWorth.common` / `resourceWorth.rare` | Base income per resource type for common and rare planet tiers. Drives the server-side economy tick (every 5 s). |

`GET /api/config` returns the core fields plus **`worldSeed`**, **`seedPeriodStartsAtUtc`**, **`seedPeriodEndsAtUtc`**, and economy values.

---

## Local development (without Docker)

Requires two running PostgreSQL 16 instances, then:

```bash
cp .env.example .env   # fill in all values

npm install

# Set connection strings (PowerShell example)
$env:DATABASE_URL       = "postgres://game:game@localhost:5432/star_wars_grid"
$env:USERS_DATABASE_URL = "postgres://users:users@localhost:5433/star_wars_users"
$env:JWT_SECRET         = "dev_secret_change_me"

npm start
```

The server creates tables automatically on first run. Ensure `config/game.settings.json` exists (the file is included in the repository).

### Ports (local)

| Service | Port |
|---------|------|
| App | `8080` (or `PORT` env var) |
| Game Postgres | `5432` |
| Users Postgres | `5433` |

---

## UI layout

| Pane | Content |
|------|---------|
| **Left column** | Title, team scores, player info, cooldown timer, world seed & period countdown, Refresh button, selection details |
| **Right side** | Galaxy map — a perfect square anchored to the right edge of the viewport |

---

## Game mechanics

### Teams (Résistance / Premier Ordre)

- Users register with a team (`Résistance` or `Premier Ordre`) that is locked to their account and embedded in their JWT.
- **Your** discovered tiles use your team colour. Unclaimed ring tiles use the neutral idle tint.
- Tiles discovered by the **other** team appear grey, show no planet, and are not clickable. The first reveal owns the tile (`discovered_by`).

### Cooldown

After revealing a **new** tile, a per-user cooldown starts. During cooldown you cannot reveal additional unseen tiles, but you can still click tiles your team has already discovered to view their stats. The effective cooldown is reduced by the team's element bonus:

```
effectiveCooldown = clickCooldownSeconds / (1 + elementBonus / 100)
```

### World seed & wipe

The world seed changes automatically when the UTC period slot advances. On a seed change the server truncates `grid_cells` and starts a fresh era. Data in `users`, cooldown tables, econ scores, and victory points is kept across wipes.

### Economy

A server-side tick runs every 5 seconds. It reads the current grid from the database, computes income and element bonus for each team from their discovered planets, and persists the deltas. No browser needs to be connected for the economy to progress.

---

## API reference

All endpoints are relative to the app root.

### Public

| Method | Path | Description |
|--------|------|-------------|
| `GET` | `/api/config` | Game config plus current world seed and period timestamps. Accepts optional `?team=blue|red` and Bearer token to compute per-user cooldown remaining. |
| `GET` | `/api/grid/:seed` | All revealed cells for `seed`. Returns `410` if `seed` is not the current world seed. |
| `GET` | `/api/scores` | `{ blue: N, red: N }` — tile counts for the current period. |
| `GET` | `/api/econ-scores` | Economic score totals for the current period. |
| `GET` | `/api/element-bonus` | Current element bonus percentages per team. |
| `GET` | `/api/victory-points` | All awarded victory points across eras. |
| `GET` | `/api/db-info` | Database creation timestamp. |

### Auth (no token required)

| Method | Path | Body | Response |
|--------|------|------|----------|
| `POST` | `/api/auth/register` | `{ username, email, password, team }` | `{ token, user }` |
| `POST` | `/api/auth/login` | `{ username, password }` | `{ token, user }` |

### Auth (Bearer token required)

| Method | Path | Description |
|--------|------|-------------|
| `GET` | `/api/auth/me` | Returns refreshed `{ token, user }`. |
| `POST` | `/api/cell/reveal` | Body `{ seed, x, y }`. Team is taken from the JWT. First reveal wins; **`409`** if the other team already owns the tile; **`410`** if seed is stale; **`429`** if on cooldown. |

### Auth field rules

| Field | Rules |
|-------|-------|
| `username` | 2–32 characters |
| `password` | Minimum 6 characters |
| `team` | `"Résistance"` or `"Premier Ordre"` |
| `email` | Must be unique |

Tokens are valid for **7 days**. Call `GET /api/auth/me` to silently renew.

---

## Docker image notes

- Build uses a **two-stage** Dockerfile:
  - Stage 1 (`node:20-alpine`): installs production dependencies via `npm ci`.
  - Stage 2 (`gcr.io/distroless/nodejs20-debian12:nonroot`): minimal runtime with no shell or package manager; runs as UID 65532.
- `NODE_ENV=production` is set inside the image.
- Built-in health check: calls `server/healthcheck.js` via the Node binary every 15 s (no `wget`/`curl` — distroless has none).
- Secrets are **never baked into the image** — always passed via `.env` / Compose environment.

---

## Database persistence

PostgreSQL data lives in bind-mount directories on the host:

| Directory | Database |
|-----------|----------|
| `./data/postgres` | Game DB (`star_wars_grid`) |
| `./data/postgres_users` | Users DB (`star_wars_users`) |

A **world wipe** only truncates the `grid_cells` table when the UTC period slot changes; it does not touch the host data directories. Users, cooldowns, econ scores, and victory points survive wipes.

To fully reset the game state (including all user accounts), stop the stack and delete both data directories, then start again:

```bash
docker compose down
rm -rf data/postgres data/postgres_users
mkdir -p data/postgres data/postgres_users
docker compose up -d
```