committed

queries/aggregation.js

@@ -0,0 +1,34 @@
+const Notification = require('../models/notification');
+
+async function aggregateLowPriorityNotifications(userId) {
+  const oneHourFromNow = new Date(Date.now() + 60 * 60 * 1000);
+  const notifications = await Notification.find({
+    userId,
+    priority: 'low',
+    sendTime: { $lte: oneHourFromNow },
+    status: 'pending'
+  });
+
+  if (notifications.length > 1) {
+    const summary = `You have ${notifications.length}
+      ${notifications.map(n => '- ' + n.message).join('\n')}`;
+    
+    await Notification.updateMany(
+      { _id: { $in: notifications.map(n => n._id) } },
+      { $set: { status: 'aggregated' } }
+    );
+
+    return new Notification({
+      userId,
+      message: summary,
+      priority: 'low',
+      sendTime: new Date(),
+      status: 'pending'
+    });
+  }
+
+  return null;
+}
+
+module.exports = { aggregateLowPriorityNotifications };
+