# WhatsApp Clone - Supabase Migration Plan

## Current State Analysis
Based on memories, the app is fully functional with:
- ✅ Backend running on port 5000 with MongoDB
- ✅ Frontend compiles without errors, runs on port 3000  
- ✅ Working features: Profile, Groups, Search, Communities, Starred Messages, Settings
- ✅ Video calling with proper permission handling
- ✅ Message actions (delete, star) working

## Migration Strategy - Incremental Approach

### Phase 1: Setup & Authentication (Day 1)
1. **Supabase Project Setup**
   - Create Supabase project
   - Run database schema from `supabase-setup.md`
   - Get credentials

2. **Authentication Migration**
   - Keep existing MongoDB auth as fallback
   - Add Supabase auth alongside
   - Test login/register with Supabase
   - Gradually migrate users

### Phase 2: Core Data Migration (Day 2-3)
1. **User Management**
   - Migrate user profiles to Supabase
   - Update user search functionality
   - Preserve existing user data

2. **Conversations & Messages**
   - Create parallel Supabase conversation system
   - Implement message sending via Supabase
   - Test conversation creation/opening

### Phase 3: Real-time Features (Day 4)
1. **Replace Socket.io**
   - Implement Supabase real-time subscriptions
   - Test message delivery
   - Test online status updates

2. **Advanced Features**
   - File uploads to Supabase Storage
   - Message starring/deletion
   - Group chat functionality

### Phase 4: Deployment (Day 5)
1. **Vercel Deployment**
   - Deploy frontend to Vercel
   - Configure environment variables
   - Test production build

2. **Final Migration**
   - Switch all users to Supabase
   - Remove MongoDB dependencies
   - Clean up old code

## Files to Modify

### Frontend Changes
- `src/features/userSlice.js` - Replace auth with Supabase
- `src/features/chatSlice.js` - Replace API calls with Supabase
- `src/components/auth/` - Update login/register forms
- `src/components/sidebar/conversations/` - Update conversation logic
- `src/components/Chat/` - Update messaging system

### Backend Changes (Minimal)
- Keep existing Express server for file uploads initially
- Gradually replace with Supabase Edge Functions
- Remove MongoDB models and controllers

## Risk Mitigation
1. **Backup Strategy**
   - Keep MongoDB running during migration
   - Create git branches for each phase
   - Test each feature thoroughly

2. **Rollback Plan**
   - Environment variables to switch between systems
   - Database sync scripts if needed
   - Gradual user migration

## Benefits After Migration
- ✅ No more database corruption issues
- ✅ Built-in authentication & authorization
- ✅ Real-time subscriptions (better than Socket.io)
- ✅ Auto-scaling database
- ✅ Production-ready deployment
- ✅ Better security with Row Level Security
