Refactor code structure for improved readability and maintainability; optimize performance across multiple modules.

backend/controllers/pushNotificationController.js

@@ -0,0 +1,34 @@
+import Joi from 'joi';
+import * as pushNotificationService from '../services/pushNotificationService.js';
+
+const tokenSchema = Joi.object({ token: Joi.string().trim().min(20).max(4096).required(), enabled: Joi.boolean().default(true) });
+const settingsSchema = Joi.object({
+  enabled: Joi.boolean(),
+  chatEnabled: Joi.boolean(),
+  friendLoginEnabled: Joi.boolean(),
+  falukantEnabled: Joi.boolean(),
+  vocabReminderEnabled: Joi.boolean(),
+}).min(1);
+
+const pushNotificationController = {
+  async registerDevice(req, res) {
+    const { error, value } = tokenSchema.validate(req.body || {});
+    if (error) return res.status(400).json({ error: error.details[0].message });
+    return res.status(200).json(await pushNotificationService.registerDevice(req.headers.userid, value));
+  },
+  async disableDevice(req, res) {
+    const { error, value } = tokenSchema.validate({ token: req.params.token, enabled: false });
+    if (error) return res.status(400).json({ error: error.details[0].message });
+    return res.status(200).json(await pushNotificationService.disableDevice(req.headers.userid, value.token));
+  },
+  async getSettings(req, res) {
+    return res.status(200).json(await pushNotificationService.loadSettings(req.headers.userid));
+  },
+  async updateSettings(req, res) {
+    const { error, value } = settingsSchema.validate(req.body || {});
+    if (error) return res.status(400).json({ error: error.details[0].message });
+    return res.status(200).json(await pushNotificationService.updateSettings(req.headers.userid, value));
+  },
+};
+
+export default pushNotificationController;