dashlibstorage/README.md

# libdashstore

MSSQL schema + domain API for Dash. One class, methods mirror the file path under `src/store/`.

**`mssql` is a peer dependency** — the host app (e.g. dashback) owns `ConnectionPool` and `import sql from 'mssql'`. libdashstore store code uses only the passed `pool` (no own `mssql` install at runtime). Scripts here (`init-schema`, `test-api`, …) use `mssql` from `devDependencies`.

```js
import sql from 'mssql';
import LibDashStore from 'libdashstore';

const pool = await sql.connect({ /* … */ });
const client = await new LibDashStore(pool); // runs initialize() (ensure schema, no purge)
```

SQL lives in `src/sql/<table>.js`. Schema DDL: `src/schema.js` / `import 'libdashstore/schema'`.

ID fields in the JS API use camelCase `…Id` (DB columns stay snake_case). `googleAuthId` is always `google_auth.id` (the logged-in user), not `companyuser.id`.

---

## Schema

**Kein Migrations-Code:** Wir gehen von einer frischen DB aus (`npm run reset-db`). Schema nur in `src/schema.js`; Anpassungen an einer laufenden DB manuell per `sqlcmd`, nicht im Repo.

| Method | Description |
| --- | --- |
| `initialize()` | Runs all `SCHEMA_SCRIPTS` (`IF NOT EXISTS`). Does **not** purge. |
| `purge()` | Drops all known tables + number procedure. |

---

## `company`

| Method | Signature | Returns |
| --- | --- | --- |
| `create` | `({ iso639, name, taxrate, reducedtaxrate, googleAuthId })` | `{ id, rootCategoryId, languageId, taxrateId, reducedtaxrateId, taxfreerateId }` |
| `update` | `(id, { iso639, name, taxrate, reducedtaxrate })` | `{ id, rootCategoryId, languageId, taxrateId, reducedtaxrateId, taxfreerateId }` |
| `delete` | `(companyId)` | `void` |
| `list` | `(googleAuthId)` | `{ id, name, rootCategoryId, languageId, taxrate, reducedtaxrate, taxfreerate }[]` |

### `create` (transaction)

For `POST /api/company`:

1. Fails if `name` is taken (`Company name not available`)
2. Ensures language by `iso639` (get or create)
3. Ensures tax rows for `taxrate`, `reducedtaxrate`, and `0` → `taxfreerateId`
4. Creates root category (`parentId = null`)
5. Inserts company with all FKs set
6. Links creator as `companyuser` (`googleAuthId` → `company_id`)

`company.poscustomergroup_id` (optional) points at the `customergroup` used for POS pricing in `getTreeForCompany` articles.

### `list`

Returns only companies where `googleAuthId` has a `companyuser` row.

### `update` (transaction)

For `PATCH /api/company/:id`:

1. Fails if company missing / name taken by another company
2. Ensures lang + tax rates
3. Updates `name`, `default_language_id`, `taxrate`, `reducedtaxrate`  
   (`taxfreerateId` / root category unchanged)

---

## `google_auth`

| Method | Signature | Returns |
| --- | --- | --- |
| `add` | `(email)` | `id` |
| `getByEmail` | `(email)` | `{ id, email, createdAt, selectedCompanyId } \| undefined` |
| `listAllowedEmails` | `()` | `{ id, email, createdAt, selectedCompanyId }[]` |
| `removeAllowedEmail` | `(email)` | `void` |
| `setSelectedCompany` | `(googleAuthId, companyId)` | `void` |

Backend mapping:

- Login: `getByEmail(email)`
- CLI user manager: `listAllowedEmails()` / `removeAllowedEmail(email)` / `add(email)`
- `PUT /api/auth/selected-company`: `setSelectedCompany(googleAuthId, companyId)`

---

## `companyuser`

| Method | Signature | Returns |
| --- | --- | --- |
| `add` | `(companyId, googleAuthId)` | `id` |
| `getByEmail` | `(email)` | `id[]` |
| `delete` | `(id)` | `void` |

---

## `lang`

| Method | Signature | Returns |
| --- | --- | --- |
| `create` | `(iso639)` | `id` |
| `getByIso639` | `(iso639)` | `{ id, iso639 } \| undefined` |
| `ensure` | `(iso639, tx?)` | `id` |
| `list` | `()` | `{ id, iso639 }[]` |
| `delete` | `(id)` | `void` |

---

## `tax`

| Method | Signature | Returns |
| --- | --- | --- |
| `create` | `(rate)` | `id` |
| `getByRate` | `(rate)` | `{ id, rate } \| undefined` |
| `ensure` | `(rate, tx?)` | `id` |
| `list` | `()` | `{ id, rate }[]` |

---

## `category`

| Method | Signature | Returns |
| --- | --- | --- |
| `createUnderParent` | `({ googleAuthId, parentId, name })` | `{ id, parentId, sort, name }` |
| `delete` | `({ googleAuthId, id })` | `void` — blocked by FK if `categoryarticle` or child categories remain |
| `getTreeForCompany` | `(googleAuthId, companyId)` | `{ languageId, tree, articles }` |
| `getCategoryArticles` | `(googleAuthId, categoryId)` | `{ id, sku, name, slug, net, taxRate, optionsCount, articleListCount, childCount, fatherArticleId, fatherSku, thumbW, thumbH, thumbHash }[]` |

### `createUnderParent` (transaction)

1. `parentId` exists, else `Parent not found`
2. Walk ancestors to root; find `company` with `root_category_id` = root
3. `companyuser` for `(googleAuthId, companyId)`, else `Not authorized`
4. Insert `category` (next sibling `sort`) + `categorytext` (`name`, slugified `slug`, company default language)

`getTreeForCompany` throws `Not authorized` if `googleAuthId` is not a `companyuser` of `companyId`, and `Company not found` if the company is missing, has no `root_category_id`, or no `default_language_id`.

---

## `article`

| Method | Signature | Returns |
| --- | --- | --- |
| `createUnderParent` | `({ googleAuthId, parentId, name })` | `{ id, parentId, name, sku }` |
| `getBySku` | `(googleAuthId, sku)` | detail object (see below) |
| `updateBySku` | `(googleAuthId, sku, { name })` | same shape as `getBySku` |
| `addImage` | `(googleAuthId, sku, imageBuffer)` | image result (see below) |

`addImage` accepts a full-size AVIF `Buffer`. Full image: if already AVIF and ≤1000×1000, stored as-is; otherwise scaled to max 1000×1000 (`pic.fullbinary`). Thumb always scaled to max 200×200 (`pic.thumbbinary`) via `sharp`. Computes `hash` / `thumbhash`, links `articlepic`. Auth like `getBySku`. Errors: `Article not found`, `Not authorized`.

`addImage` returns:

```js
{
  picId,
  sort,
  full: { w, h, size },   // AVIF, max 1000×1000 (stored as-is when already AVIF and within bounds)
  thumb: { w, h },        // scaled AVIF, max 200×200 (fit inside)
  hash,                   // SHA-256 hex of full image bytes
  thumbHash,              // base64 thumbhash of thumb preview
}
```

`getBySku` / `updateBySku` return:

```js
{
  id, sku, name, slug,
  unitamount, weight,
  unit: { si },
  brand: { name, thumbW, thumbH, thumbHash } | null,
  categoryIds: number[],
  photos: { sort, fullHash, thumbW, thumbH, thumbHash }[],
  eans: string[],
  prices: { minmultiplier, net, taxRate, customergroupId }[],
  optionsCount, articleListCount, childCount,
  fatherArticleId, fatherSku,
}
```

`getCategoryArticles` / `getTreeForCompany().articles[]` keep the flat list shape (`net`, `taxRate`, single `thumbW`/`thumbH`/`thumbHash`).

`parentId` is the category id. Creates `article` + `articletext` (company default language) + `categoryarticle` in one transaction. Allocates `sku` via `getnextnumberwithprefixandpadding` (`type` `sku`; creates `numbers` row with empty prefix if missing). Default unit `pc` is ensured if missing (`unitamount` 1, `weight` 0). Auth via `resolveCategoryAccess(googleAuthId, parentId)` — `Parent not found` / `Not authorized`.

Auth via the article's `categoryarticle` category + `resolveCategoryAccess`. Errors: `Article not found`, `Not authorized`.

`updateBySku` updates `articletext` (company default language) in a transaction (`name` + slugified `slug`), then returns the same object as `getBySku`. Errors: `Article not found`, `Not authorized`, `Name required`.

---

## `pic`

Lookup by `pic.hash` (SHA-256 hex from `addImage`), not `thumbhash`.

| Method | Signature | Returns |
| --- | --- | --- |
| `getImageByHash` | `(googleAuthId, hash)` | `{ buffer, w, h, size, contentType }` |
| `getThumbByHash` | `(googleAuthId, hash)` | `{ buffer, w, h, contentType }` |

Auth via `articlepic` → `categoryarticle` → `resolveCategoryAccess`. Errors: `Image not found`, `Not authorized`.

`contentType` is always `image/avif`. In dashback:

```js
const { buffer, contentType } = await store.pic.getImageByHash(req.user.id, hash);
res.set('Content-Type', contentType).send(buffer);
```

---

## Backend route cheatsheet

| Route | Store call |
| --- | --- |
| `POST /api/company` | `company.create({ iso639, name, taxrate, reducedtaxrate, googleAuthId })` |
| `GET /api/company` | `company.list(googleAuthId)` |
| `PATCH /api/company/:id` | `company.update(id, { iso639, name, taxrate, reducedtaxrate })` |
| `DELETE /api/company/:id` | `company.delete(id)` |
| `PUT /api/auth/selected-company` | `google_auth.setSelectedCompany(googleAuthId, companyId)` |
| `GET /api/category/tree?companyId=` | `category.getTreeForCompany(googleAuthId, companyId)` |
| `POST /api/category` | `category.createUnderParent({ googleAuthId, parentId, name })` |
| `DELETE /api/category/:id` | `category.delete({ googleAuthId, id })` |
| `POST /api/article` | `article.createUnderParent({ googleAuthId, parentId, name })` |
| `GET /api/article/:sku` | `article.getBySku(googleAuthId, sku)` |
| `PATCH /api/article/:sku` | `article.updateBySku(googleAuthId, sku, { name })` |
| `POST /api/article/:sku/image` | `article.addImage(googleAuthId, sku, imageBuffer)` |
| `GET /api/image/:hash` | `pic.getImageByHash(googleAuthId, hash)` |
| `GET /api/image/:hash/thumb` | `pic.getThumbByHash(googleAuthId, hash)` |

---

## Scripts

```bash
npm run purge-db      # drop all tables + procedure (wipe data)
npm run reset-db      # purge + init-schema (empty DB, fresh schema)
npm run init-schema   # ensure schema only (does NOT delete data)
npm run test:api      # interactive API tester
npm run schema-graph  # regenerate schema-graph.svg
```

Env: `MSSQL_SERVER`, `MSSQL_DATABASE`, `MSSQL_USER`, `MSSQL_PASSWORD`.