# Unified Refresh System - Implementation Summary

## ✅ What Has Been Created

### Core Infrastructure Files

1. **`lib/constants/refresh-intervals.ts`**
   - Standardized refresh intervals for all resources
   - Helper functions for interval management
   - All intervals harmonized and documented

2. **`lib/utils/request-deduplication.ts`**
   - Request deduplication utility
   - Prevents duplicate API calls within 5 seconds
   - Automatic cleanup of stale requests

3. **`lib/services/refresh-manager.ts`**
   - Centralized refresh management
   - Handles all refresh intervals
   - Provides pause/resume functionality
   - Prevents duplicate refreshes

4. **`hooks/use-unified-refresh.ts`**
   - React hook for easy integration
   - Automatic registration/cleanup
   - Manual refresh support

### Documentation Files

1. **`IMPLEMENTATION_PLAN_UNIFIED_REFRESH.md`**
   - Complete architecture overview
   - Detailed implementation guide
   - Code examples for all widgets

2. **`IMPLEMENTATION_CHECKLIST.md`**
   - Step-by-step checklist
   - Daily progress tracking
   - Success criteria

---

## 🎯 Next Steps

### Immediate Actions (Start Here)

#### 1. Fix Critical Memory Leaks (30 minutes)

**File**: `lib/services/notifications/notification-service.ts`

Replace `redis.keys()` with `redis.scan()`:

```typescript
// Line 293 - BEFORE
const listKeys = await redis.keys(listKeysPattern);

// AFTER
const listKeys: string[] = [];
let cursor = '0';
do {
  const [nextCursor, keys] = await redis.scan(
    cursor, 
    'MATCH', 
    listKeysPattern, 
    'COUNT', 
    100
  );
  cursor = nextCursor;
  if (keys.length > 0) {
    listKeys.push(...keys);
  }
} while (cursor !== '0');
```

---

#### 2. Test Core Infrastructure (1 hour)

Create a test file to verify everything works:

**File**: `lib/services/__tests__/refresh-manager.test.ts` (optional)

Or test manually:
1. Import refresh manager in a component
2. Register a test resource
3. Verify it refreshes at correct interval
4. Verify cleanup on unmount

---

#### 3. Refactor Notifications (2-3 hours)

**File**: `hooks/use-notifications.ts`

Key changes:
- Remove manual polling logic
- Use `useUnifiedRefresh` hook
- Add `requestDeduplicator` for API calls
- Fix useEffect dependencies

See `IMPLEMENTATION_PLAN_UNIFIED_REFRESH.md` Section 3.1 for full code.

---

#### 4. Refactor Notification Badge (1 hour)

**File**: `components/notification-badge.tsx`

Key changes:
- Remove duplicate `useEffect` hooks
- Use hook's `refresh` function for manual refresh
- Remove manual fetch logic

---

#### 5. Refactor Navigation Bar Time (30 minutes)

**File**: `components/main-nav.tsx` + `components/main-nav-time.tsx` (new)

Key changes:
- Extract time display to separate component
- Use `useUnifiedRefresh` hook (1 second interval)
- Fix static time issue

See `IMPLEMENTATION_PLAN_UNIFIED_REFRESH.md` Section 3.7 for full code.

---

#### 6. Refactor Widgets (1 hour each)

Start with high-frequency widgets:
1. **Parole** (`components/parole.tsx`) - 30s interval
2. **Calendar** (`components/calendar.tsx`) - 5min interval
3. **News** (`components/news.tsx`) - 10min interval
4. **Email** (`components/email.tsx`) - 1min interval
5. **Duties** (`components/flow.tsx`) - 2min interval

See `IMPLEMENTATION_PLAN_UNIFIED_REFRESH.md` Section 3.2 for example code.

---

## 📊 Expected Results

### Before Implementation:
- ❌ 120-150 API calls/minute
- ❌ Memory leaks from uncleaned intervals
- ❌ Duplicate requests
- ❌ No coordination between widgets

### After Implementation:
- ✅ 40-50 API calls/minute (60-70% reduction)
- ✅ No memory leaks
- ✅ Request deduplication working
- ✅ Centralized refresh coordination

---

## 🔍 Testing Checklist

After each phase, verify:

- [ ] No console errors
- [ ] Widgets refresh at correct intervals
- [ ] Manual refresh buttons work
- [ ] No duplicate API calls (check Network tab)
- [ ] No memory leaks (check Memory tab)
- [ ] Cleanup on component unmount
- [ ] Multiple tabs don't cause issues

---

## 🚨 Important Notes

### Backward Compatibility

All new code is designed to be:
- ✅ Non-breaking (old code still works)
- ✅ Gradual migration (one widget at a time)
- ✅ Easy rollback (keep old implementations)

### Migration Strategy

1. **Phase 1**: Core infrastructure (DONE ✅)
2. **Phase 2**: Fix critical issues
3. **Phase 3**: Migrate notifications
4. **Phase 4**: Migrate widgets one by one
5. **Phase 5**: Remove old code

### Feature Flags (Optional)

If you want to toggle the new system:

```typescript
// In refresh manager
const USE_UNIFIED_REFRESH = process.env.NEXT_PUBLIC_USE_UNIFIED_REFRESH !== 'false';

if (USE_UNIFIED_REFRESH) {
  // Use new system
} else {
  // Use old system
}
```

---

## 📈 Performance Monitoring

### Metrics to Track

1. **API Call Count**
   - Before: ~120-150/min
   - Target: ~40-50/min
   - Monitor in Network tab

2. **Memory Usage**
   - Before: Growing over time
   - Target: Stable
   - Monitor in Memory tab

3. **Refresh Accuracy**
   - Verify intervals are correct
   - Check last refresh times
   - Monitor refresh manager status

### Debug Tools

```typescript
// Get refresh manager status
const status = refreshManager.getStatus();
console.log('Refresh Manager Status:', status);

// Get pending requests
const pendingCount = requestDeduplicator.getPendingCount();
console.log('Pending Requests:', pendingCount);
```

---

## 🎓 Learning Resources

### Key Concepts

1. **Singleton Pattern**: Refresh manager uses singleton
2. **Request Deduplication**: Prevents duplicate calls
3. **React Hooks**: Proper cleanup with useEffect
4. **Memory Management**: Clearing intervals and refs

### Code Patterns

- **useRef for callbacks**: Prevents dependency issues
- **Map for tracking**: Efficient resource management
- **Promise tracking**: Prevents duplicate requests

---

## 🐛 Troubleshooting

### Issue: Widgets not refreshing

**Check**:
1. Is refresh manager started? (`refreshManager.start()`)
2. Is resource registered? (`refreshManager.getStatus()`)
3. Is user authenticated? (`status === 'authenticated'`)

### Issue: Duplicate API calls

**Check**:
1. Is request deduplication working? (`requestDeduplicator.getPendingCount()`)
2. Are multiple components using the same resource?
3. Is TTL too short?

### Issue: Memory leaks

**Check**:
1. Are intervals cleaned up? (check cleanup functions)
2. Are refs cleared? (`isMountedRef.current = false`)
3. Are pending requests cleared? (check cleanup)

---

## 📝 Next Session Goals

1. ✅ Core infrastructure created
2. ⏭️ Fix Redis KEYS → SCAN
3. ⏭️ Refactor notifications hook
4. ⏭️ Refactor notification badge
5. ⏭️ Refactor first widget (Parole)

---

## 🎉 Success!

Once all widgets are migrated:

- ✅ Unified refresh system
- ✅ 60%+ reduction in API calls
- ✅ No memory leaks
- ✅ Better user experience
- ✅ Easier maintenance

---

*Last Updated: Implementation Summary v1.0*