# Cross-Origin / Same-Code Debugging (SPQ-specific)

Diagnose why the **same PocketBase + React app code** behaves differently on two domains.

## When to Use

User reports: "Feature X works on shopproquote.graj-media.com but returns 'Invalid input' / 'Error' on grajmedia.duckdns.org." Both serve the same build.

## Protocol

### 1. Verify code is identical

Check nginx config at `/etc/nginx/sites-enabled/`:

```bash
cat /etc/nginx/sites-enabled/shopproquote
```

Look for:
- `root` directive — same path for both `server_name` entries?
- `server_name` — both domains listed in the same `server` block?

In SPQ's deployment, nginx serves all three domains (`grajmedia.duckdns.org`, `graj-media.com`, `shopproquote.graj-media.com`) from a single `root` at `/mnt/seagate8tb/Websites/ShopProQuote.backup-20260626-2058/spq-v2/dist`.

### 2. Check backend proxy

In the same nginx config, check all `location /pb/` blocks:

```
proxy_pass http://127.0.0.1:8091/;
```

Both domains proxy to the same PocketBase instance. No difference possible.

### 3. Conclusion

If code AND backend are identical, the difference is **client-side state**:

- **localStorage** — per-origin; the Zustand `spq-quote` store is persisted here
- Service worker cache (less common)
- Cookies

### 4. Find the failing data path

In SPQ's Quote Generator, both **Save** (`handleSave` in `QuoteSummary.tsx`) and **Share** (`handleShare` → `ensureShareToken`) do:

```typescript
const parsed = quoteWriteSchema.safeParse(data);
if (!parsed.success) {
  console.warn('Quote schema validation failed:', JSON.stringify(parsed.error.issues, null, 2));
  showToast(parsed.error.issues[0].message, 'error');
  return;
}
```

The toast message like "Invalid input" comes from Zod validation. Common fields that fail:

| Field | Schema constraint | Stale localStorage value |
|---|---|---|
| `discountType` | `z.enum(['dollar', 'percent'])` | `null`, `undefined`, or unexpected string |
| `customerDecision` (per service) | `z.enum(['approved', 'declined', 'pending'])` | `undefined` (missing from old store shape) |
| `customerName` | `z.string().min(1)` | `""` |
| `vehicleInfo` | `z.string().min(1)` | `""` |

### 5. Confirm stale localStorage

Open DevTools → Application → Local Storage → `<origin>` → key `spq-quote`.
Compare the stored `discount` and `services` arrays against the current Zod schema (`src/schemas/quote.ts`).

### 6. Fix

```js
localStorage.removeItem('spq-quote');
```

Reload and retry.