feat: Add email notifications for event registration confirmation to users

[codeunia-dev]

Add email notifications for event registration confirmation to users

Authored by: @akshay0611

Summary by CodeRabbit

Release Notes

• New Features
  • Event registrations now trigger confirmation emails to users with event details and next steps
  • Event organizers receive automated notifications when participants register, including registration status and capacity information
  • Email notifications are non-blocking and won't prevent successful event registration

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Preview	Comments	Updated (UTC)
codeunia	Ready	Preview	Comment	Nov 24, 2025 6:39am

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

A new email notification system for event registrations is introduced. The event registration endpoint now retrieves expanded event data and triggers email confirmations to registrants and organizers via Resend. Email sending is non-blocking and does not affect registration success. A new email utilities module provides template generation and sending orchestration.

Changes

Cohort / File(s)	Summary
Event registration endpoint enhancement app/api/events/[slug]/register/route.ts	Extended event data selection to include slug, date, time, location, organizer, company_id, and organizer email. Added post-registration email sending via dynamic import with error handling that does not block registration. Minor formatting adjustments to parameter extraction and environment checks.
New email utilities module lib/email/event-emails.ts	New module providing HTML email template builders (registration confirmation, organizer notification), email sending orchestration for event registrations via Resend API, and generic email sender. Includes API key validation, calendar link generation, and conditional organizer alerts.

Sequence Diagram(s)

sequenceDiagram
    participant Client
    participant Endpoint as POST /register
    participant DB as Database
    participant Email as Email Module
    participant Resend as Resend API
    
    Client->>Endpoint: Register for event
    Endpoint->>DB: Validate & create registration
    DB-->>Endpoint: Registration confirmed
    
    Note over Endpoint,Email: Non-blocking email flow
    Endpoint->>Email: sendEventRegistrationEmails()
    Email->>Email: Generate confirmation template
    Email->>Email: Generate organizer template
    Email->>Resend: Send user confirmation
    Email->>Resend: Send organizer notification
    Resend-->>Email: Email sent (or error)
    Email-->>Endpoint: Success flag (non-fatal)
    
    Endpoint-->>Client: Registration response (success regardless)

Loading

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

• Email module logic: Review template generation, Resend API integration, and error handling patterns across multiple exported functions
• Integration point: Verify non-blocking email flow does not inadvertently impact registration success paths
• Data validation: Confirm environment variable checks and parameter validation in email sending functions
• Template content: Validate HTML email template correctness and dynamic content insertion

Poem

🐰 Hops of joy through registration lines,
Emails flutter like digital signs,
Confirmations sent with Resend's care,
Organizers notified, events laid bare,
Non-blocking grace—no crashes today!
✨📧

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch enhance/event

---

📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 3eddc4d and f1a6fde.

📒 Files selected for processing (2)

• app/api/events/[slug]/register/route.ts (8 hunks)
• lib/email/event-emails.ts (1 hunks)

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}