# Catalyst

A lightweight instance registry for tracking self-hosted infrastructure. No backend, no framework — just a browser, a SQLite database compiled to WebAssembly, and a static file server.

## Structure

```
index.html        Entry point
css/app.css       Styles
js/
  config.js       Service definitions and seed data
  db.js           Data layer
  ui.js           Rendering, modals, notifications
  app.js          Router
```

## Data layer

All reads and writes go through five functions in `js/db.js`. This is the boundary that would be replaced when wiring Catalyst to a real backend — nothing else in the codebase touches data directly.

### `getInstances(filters?)`

Returns an array of instances, sorted by name. All filters are optional.

```js
getInstances()
getInstances({ search: 'plex' })
getInstances({ state: 'degraded' })
getInstances({ stack: 'production' })
getInstances({ search: 'home', state: 'deployed', stack: 'production' })
```

`search` matches against `name`, `vmid`, and `stack`.

### `getInstance(vmid)`

Returns a single instance by VMID, or `null` if not found.

```js
getInstance(137) // → { id, name, vmid, state, stack, ...services, createdAt, updatedAt }
```

### `getDistinctStacks()`

Returns a sorted array of unique stack names present in the registry. Used to populate the stack filter dynamically.

```js
getDistinctStacks() // → ['development', 'production']
```

### `createInstance(data)`

Inserts a new instance. Returns `{ ok: true }` on success or `{ ok: false, error }` on failure (e.g. duplicate VMID).

```js
createInstance({
  name: 'plex',
  vmid: 117,
  state: 'deployed',        // 'deployed' | 'testing' | 'degraded'
  stack: 'production',
  tailscale_ip: '100.64.0.1',
  atlas: 1,
  argus: 1,
  semaphore: 0,
  patchmon: 1,
  tailscale: 1,
  andromeda: 0,
  hardware_acceleration: 1,
})
```

### `updateInstance(id, data)`

Updates an existing instance by internal `id`. Accepts the same shape as `createInstance`. Returns `{ ok: true }` or `{ ok: false, error }`.

### `deleteInstance(id)`

Deletes an instance by internal `id`. Only instances on the `development` stack can be deleted — this is enforced in the UI before `deleteInstance` is ever called.

---

## Instance shape

| Field | Type | Notes |
|---|---|---|
| `id` | integer | Internal autoincrement ID |
| `vmid` | integer | Unique. Used as the public identifier and in URLs (`/instance/137`) |
| `name` | string | Display name |
| `state` | string | `deployed`, `testing`, or `degraded` |
| `stack` | string | `production` or `development` |
| `tailscale_ip` | string | Optional |
| `atlas` | 0 \| 1 | |
| `argus` | 0 \| 1 | |
| `semaphore` | 0 \| 1 | |
| `patchmon` | 0 \| 1 | |
| `tailscale` | 0 \| 1 | |
| `andromeda` | 0 \| 1 | |
| `hardware_acceleration` | 0 \| 1 | |
| `createdAt` | ISO string | Set on insert |
| `updatedAt` | ISO string | Updated on every write |