Add dotenv support and bulk SMS endpoint

- Integrated dotenv for environment variable management.
- Updated queueWorker to use WORKER_INTERVAL from .env or default to 5 seconds.
- Added a new bulk SMS endpoint to queue multiple messages in a single request, with validation and transaction handling.
- Updated package.json and package-lock.json to include dotenv dependency.

routes/api.js

@@ -44,6 +44,48 @@ module.exports = function (io) {
         });
     });
 
+    // Bulk endpoint to queue multiple SMS
+    router.post('/sms/bulk', (req, res) => {
+        const { messages } = req.body;
+
+        if (!Array.isArray(messages) || messages.length === 0) {
+            return res.status(400).json({ error: 'messages array is required and cannot be empty.' });
+        }
+
+        // Validate all messages first
+        for (const msg of messages) {
+            if (!msg.phone || !msg.message) {
+                return res.status(400).json({ error: 'Each message must have a phone and message.' });
+            }
+        }
+
+        db.serialize(() => {
+            db.run("BEGIN TRANSACTION");
+            const stmt = db.prepare("INSERT INTO sms_queue (phone, message) VALUES (?, ?)");
+
+            for (const msg of messages) {
+                stmt.run([msg.phone, msg.message], function(err) {
+                    if (err) {
+                        console.error('Error inserting into sms_queue during bulk operation:', err);
+                    }
+                });
+            }
+
+            stmt.finalize();
+
+            db.run("COMMIT", (err) => {
+                if (err) {
+                    console.error('Error committing bulk SMS transaction:', err);
+                    return res.status(500).json({ error: 'Failed to queue bulk SMS.' });
+                }
+
+                return res.status(202).json({
+                    message: `Successfully queued ${messages.length} SMS messages.`
+                });
+            });
+        });
+    });
+
     return router;
 };