# Health Routine – Package Scanner

> ALWAYS UPDATE THIS FILE AFTER MAKING CHANGES

## What this is
A single-page web app (`index.html`) used internally by Health Routine staff to scan **package** barcodes.
A user selects their name, scans/types a code, and the result is looked up via a webhook and appended to a table.
Runs in any browser — designed for phones, tablets, and desktop.

## Files
```
index.html   — the entire app (HTML + CSS + JS, no build step)
logo.png     — Health Routine brand logo (used in the header)
agent.md     — this file
start        — bash script that launches live-server on localhost:8080
```

## Design
Colors are pulled directly from healthroutine.de's CSS variables:

| Token            | Hex       | Usage                               |
|------------------|-----------|-------------------------------------|
| `--primary`      | `#005f5a` | Controls bar, table header, buttons |
| `--primary-dark` | `#004845` | Hover states                        |
| `--primary-light`| `#e0f0ef` | Row hover, badge backgrounds        |
| `--bg`           | `#f7f7fa` | Page background                     |
| `--card`         | `#eaeaf2` | Alternating table rows              |
| `--sage`         | `#82917d` | (brand footer green, available)     |
| `--error`        | `#c71b1b` | Error states                        |
| `--success`      | `#15803d` | Success toasts                      |

Font: system font stack (`-apple-system`, `Segoe UI`, etc.)

## Webhook

**Base URL (scan):** `https://brandize.app.n8n.cloud/webhook/transfer`
**Base URL (batches):** `https://brandize.app.n8n.cloud/webhook/batch`

### GET — load users
Called once on page load to populate the user dropdown.

```
GET <base_url>
Authorization: Basic <base64>
```

**Actual response shape** (confirmed via console):
```json
{ "Name": ["Oliver", "Luka", "Benni"] }
```

`buildDropdown()` handles all three shapes n8n may return:
1. `{ Name: ["Oliver", "Luka", "Benni"] }` — single object, Name is an array (current)
2. `[ { Name: "Oliver" }, ... ]` — array of objects
3. `{ Name: "Oliver" }` — single object, Name is a string

### POST — submit scan
Called automatically when the user types/stops typing for 100ms (debounced).

```
POST <base_url>
Authorization: Basic <base64>
Content-Type: application/json

{ "user": "Oliver", "code": "SCANNED_BARCODE_STRING" }
```

Success response:
```json
{
  "name":       "Christa Gierdahl, Christa Gierdahl",
  "producttag": "0-HR-Nail-Care-5",
  "batch":      "BATCH/25-11-14/06173",
  "country":    "DE"
}
```

Error response (non-2xx **or** 200 with error field):
```json
{ "error": "Human-readable error description" }
```

Fields mapped to table columns:
- `country`    → **Country** (teal pill badge)
- `name`       → **Name**
- `producttag` → **Tag** (monospace pill, truncated with tooltip on hover)
- `batch`      → received but not displayed in the table

### Authentication
The webhook requires HTTP Basic Auth.

- On `401` (GET or POST) a modal appears asking for username + password.
- Credentials are saved to a **cookie** (`hr_auth`, 30-day expiry, `SameSite=Strict`) so the user is not prompted again.
- On page load, the cookie is read and credentials restored before the first network call.
- If the modal is triggered again (e.g. wrong password), the fields are **pre-filled** from the cookie and focus lands on the password field for quick confirmation.
- `saveCreds(user, pass)` — JSON-stringifies, URI-encodes, base64-encodes, writes cookie.
- `loadCredsFromCookie()` — reverses that; returns `{ user, pass }` or `null`.
- `clearCredsCookie()` — available but not exposed in UI (call from browser console if needed).

### Error handling (POST)
Two cases:
1. **Non-2xx response** — body is parsed; if `errData.error` exists it is shown verbatim; otherwise a generic `HTTP <status>` message is shown.
2. **200 response with `error` field** — treated as failure: `item.error` is displayed, row is *not* added to the table.

Errors appear in the **persistent status banner** (red, no auto-dismiss) and the scan input is selected so the user can re-scan or correct the code.

### GET — load batches
Called on page load and when the Batches tab becomes visible.

```
GET <batch_url>
Authorization: Basic <base64>
```

**Response shape:**
```json
[
  {
    "data": [
      { "id": 18599, "name": "BATCH/26-06-10/18599", "description": "mix dpd", "carrier": "DPD/AT", "state": "done" },
      ...
    ]
  }
]
```

The Batches tab shows a searchable, filterable table with German headers (Chargenname, Transport, Status). Default filter resets to `state != "done"` ("Active") each time the tab opens. Columns are sortable — click Chargenname or Status to toggle ascending/descending. Sorting resets to name-asc when switching tabs.

### NDJSON / response format
n8n sometimes returns multiple items as NDJSON (one JSON object per line) instead of a proper JSON array. `parseJson(res)` handles all three formats:
1. Standard JSON array `[...]`
2. Single JSON object `{...}` — passed through as-is
3. NDJSON — split on `\n`, each line parsed individually, returned as an array

## UI layout

```
┌─────────────────────────────────────────────────────┐
│  [HR logo]  Health Routine  |  Package Scanner       │  ← white brand bar
├─────────────────────────────────────────────────────┤
│  [▥ SCAN HERE_____________]  [User ▾]  [✕ Clear]    │  ← teal controls bar
├─────────────────────────────────────────────────────┤
│  SCAN LOG                               3 scans ●   │
│ ┌───────────────────────────────────────────────┐   │
│ │ COUNTRY  │ NAME                  │ TAG         │   │  ← sticky header
│ ├──────────┼───────────────────────┼─────────────┤   │
│ │ DE       │ Christa Gierdahl      │ 0-HR-Nail…  │   │  ← newest row on top
│ │ AT       │ ...                   │ ...         │   │
│ │          scrollable area          │             │   │
│ └───────────────────────────────────────────────┘   │
└─────────────────────────────────────────────────────┘
```

On mobile (< 620 px): scan input goes full-width on its own row; user dropdown and clear button share the row below.

## Key behaviours
- **On load**: cookie credentials restored → GET webhooks fire (users + batches) → dropdown populated → scan input auto-focused
- **Scan auto-submit**: scanner input is debounced at 100ms — typing a barcode and pausing auto-submits without needing Enter
- **Scan auto-switches tab**: submitting a scan automatically switches to the Scan Log tab if the Batches tab is active
- **Clear button**: empties the table, clears the scan input, resets the scan counter
- **No user selected**: red toast + highlighted dropdown; does not submit
- **401 on any request**: modal prompts for credentials (pre-filled from cookie), saves to cookie, retries original call
- **Webhook error**: `error` field shown verbatim in persistent red banner; input selected for re-scan
- **Network error**: dismissing error banner; input selected so user can retry
- **Dropdown error state**: tapping/focusing the dropdown while it shows an error re-triggers `loadUsers()`
- **NDJSON/array/object**: `parseJson()` normalises all response formats from n8n
- **Duplicate scan**: `isDuplicate(code)` queries `.col-code` cells (present on pending, resolved, and error rows) before enqueuing
- **Scan queue**: `scanQueue[]` is a FIFO array of `{ code, user, rowEl }`. `drainQueue()` runs sequentially in the background — one `processItem()` at a time. Scans can be added faster than the webhook responds; each gets its own pending row immediately
- **Pending row**: shows a spinner + `Processing… <code>` while the item is in-flight; replaced in-place by the resolved row or an error row
- **Error row**: red background, shows the error message and the raw code; code is still in `.col-code` so it cannot be re-scanned
- **Queue pill**: teal badge next to the scan counter showing `N pending`; hidden when queue is empty
- **Auth mid-queue**: if `processItem` gets 401, it returns `"auth"` to `drainQueue`, which pauses (`queueBusy = false`), shows the auth modal with `drainQueue` as the retry callback — queue resumes from the same item after login
- **Clear**: also drains `scanQueue` and resets `queueBusy`

## Scan flow (sequence)
```
Enter key
  └─ enqueue(code)
       ├─ validation (user selected? duplicate?)
       ├─ scanInput.value = ""  ← immediate clear
       ├─ addPendingRow(code)  ← spinner row in table
       └─ scanQueue.push(...)  ← add to FIFO
            └─ drainQueue() if idle
                 └─ processItem() loop
                      ├─ fetch POST webhook
                      ├─ resolveRow()  ← replace spinner with result
                      └─ rowError()    ← replace spinner with error
```

## Table columns (DOM)
| Visible | Header | CSS class | Content |
|---------|--------|-----------|---------|
| ✓ | Country | — | `item.country` wrapped in teal badge |
| ✓ | Name | `name-cell` | `item.name` |
| ✓ | Tag | — | `item.producttag` in monospace pill |
| ✗ | Code | `col-code` | Raw scanned code (`display:none`), used for duplicate detection |

## How to run
Open `index.html` directly in a browser (`file://`) — no server needed for local use.
Or run the `start` script for live-reload during development:
```bash
./start   # requires Node.js; installs live-server globally if missing
```