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src/api/routes/brand.js

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+import * as db from '../../db/brand.js';
+
+function requireSelectedCompany(req) {
+    const companyId = req.user.selectedCompanyId;
+    if (companyId == null) {
+        return { error: 'No company selected' };
+    }
+    return { companyId };
+}
+
+function brandErrorStatus(error) {
+    if (error.message === 'Not authorized') return 403;
+    if (error.message === 'Company not found') return 404;
+    if (error.message === 'Brand not found') return 404;
+    if (error.message === 'Invalid brand') return 400;
+    if (error.message === 'Brand in use') return 409;
+    return 500;
+}
+
+/**
+ * Registers brand routes for the authenticated user's selected company.
+ * @param {import('express').Application} app
+ * @param {string} [basePath='']
+ */
+export function register(app, basePath = '') {
+    /**
+     * @openapi
+     * /brand:
+     *   get:
+     *     tags: [Brand]
+     *     summary: List brands
+     *     description: Lists brands for the authenticated user's selected company, sorted by name.
+     *     security:
+     *       - cookieAuth: []
+     *     x-markdown: brand/list.md
+     *     responses:
+     *       200:
+     *         description: Brand list
+     *         content:
+     *           application/json:
+     *             schema:
+     *               type: object
+     *               properties:
+     *                 brands:
+     *                   type: array
+     *                   items:
+     *                     $ref: '#/components/schemas/Brand'
+     *       400:
+     *         description: No company selected
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
+     *       401:
+     *         description: Unauthorized
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
+     *       403:
+     *         description: Not authorized
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
+     *       404:
+     *         description: Company not found
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
+     *   put:
+     *     tags: [Brand]
+     *     summary: Upsert brand
+     *     description: |
+     *       Insert or update brand by `name` for the selected company. `gsprpinfo` optional.
+     *     security:
+     *       - cookieAuth: []
+     *     x-markdown: brand/upsert.md
+     *     requestBody:
+     *       required: true
+     *       content:
+     *         application/json:
+     *           schema:
+     *             type: object
+     *             required: [name]
+     *             properties:
+     *               name:
+     *                 type: string
+     *               gsprpinfo:
+     *                 type: string
+     *             example:
+     *               name: Acme
+     *               gsprpinfo: 'Acme GmbH'
+     *     responses:
+     *       200:
+     *         description: Upserted brand
+     *         content:
+     *           application/json:
+     *             schema:
+     *               type: object
+     *               properties:
+     *                 brand:
+     *                   $ref: '#/components/schemas/Brand'
+     *       400:
+     *         description: Invalid brand or no company selected
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
+     *       401:
+     *         description: Unauthorized
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
+     *       403:
+     *         description: Not authorized
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
+     *       404:
+     *         description: Company not found
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
+     */
+    app.get(`${basePath}/brand`, async (req, res) => {
+        const selected = requireSelectedCompany(req);
+        if (selected.error) {
+            return res.status(400).json({ error: selected.error });
+        }
+
+        try {
+            const brands = await db.list(req.user.id, selected.companyId);
+            res.status(200).json({ brands });
+        } catch (error) {
+            const status = brandErrorStatus(error);
+            if (status === 500) console.error('List brands failed:', error);
+            res.status(status).json({ error: error.message });
+        }
+    });
+
+    app.put(`${basePath}/brand`, async (req, res) => {
+        const selected = requireSelectedCompany(req);
+        if (selected.error) {
+            return res.status(400).json({ error: selected.error });
+        }
+
+        const { name, gsprpinfo } = req.body ?? {};
+
+        try {
+            const brand = await db.upsert(req.user.id, selected.companyId, {
+                name,
+                gsprpinfo,
+            });
+            res.status(200).json({ brand });
+        } catch (error) {
+            const status = brandErrorStatus(error);
+            if (status === 500) console.error('Upsert brand failed:', error);
+            res.status(status).json({ error: error.message });
+        }
+    });
+
+    /**
+     * @openapi
+     * /brand/{id}:
+     *   delete:
+     *     tags: [Brand]
+     *     summary: Delete brand
+     *     description: |
+     *       Deletes the brand for the selected company. Fails with `Brand in use`
+     *       if any article still references it.
+     *     security:
+     *       - cookieAuth: []
+     *     x-markdown: brand/delete.md
+     *     parameters:
+     *       - in: path
+     *         name: id
+     *         required: true
+     *         schema:
+     *           type: integer
+     *     responses:
+     *       204:
+     *         description: Deleted
+     *       400:
+     *         description: No company selected
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
+     *       401:
+     *         description: Unauthorized
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
+     *       403:
+     *         description: Not authorized
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
+     *       404:
+     *         description: Brand not found
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
+     *       409:
+     *         description: Brand in use
+     *         content:
+     *           application/json:
+     *             schema:
+     *               $ref: '#/components/schemas/Error'
+     */
+    app.delete(`${basePath}/brand/:id`, async (req, res) => {
+        const selected = requireSelectedCompany(req);
+        if (selected.error) {
+            return res.status(400).json({ error: selected.error });
+        }
+
+        const id = Number(req.params.id);
+        if (!Number.isInteger(id) || id <= 0) {
+            return res.status(400).json({ error: 'id is required' });
+        }
+
+        try {
+            await db.remove(req.user.id, selected.companyId, id);
+            res.sendStatus(204);
+        } catch (error) {
+            const status = brandErrorStatus(error);
+            if (status === 500) console.error('Delete brand failed:', error);
+            res.status(status).json({ error: error.message });
+        }
+    });
+}