Maintain a Map of online users. When a message is sent, check if the receiver is online. If not, send an email notification with the sender's name, message preview, and a link to the chat. Rate-limit to 1 email per 10 minutes and respect user notification preferences.
Request Notification.permission on first visit. When a message is received via Socket.io and the tab is hidden (document.hidden), create a new Notification with the sender's name, message text, and icon. Handle notificationclick to open the chat URL.
Check NotificationLog for a recent notification (within 10 minutes) before sending. If one exists, skip. Also respect user preferences (notificationPreferences.messageEmail). Don't send to bounced or complained emails. Log each notification sent.
Add a notificationPreferences object to the User model (messageEmail, messagePush, connectionEmail, dailyDigest, all booleans). Create a PATCH endpoint to update preferences. Check these flags before sending any notification.
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