# Refactor Phase 2B + 3: Implementation Status

**Date:** 2025-01-XX  
**Status:** ✅ Phase 2B Complete - New Architecture Implemented  
**Next:** Phase 3 - Migration & Cleanup

## Summary

New refactored architecture has been fully implemented and wired behind feature flag `USE_V2_API=true`. All new services, repositories, and API controllers are in place.

---

## ✅ Completed Components

### Infrastructure Layer (`/infrastructure`)

1. **`infrastructure/jira/JiraAssetsClient.ts`** ✅
   - Pure HTTP API client (no business logic)
   - Methods: `getObject()`, `searchObjects()`, `updateObject()`, `getSchemas()`, `getObjectTypes()`, `getAttributes()`
   - Token management (service account for reads, user PAT for writes)
   - Returns `ObjectEntry` from domain types

### Domain Layer (`/domain`)

1. **`domain/jiraAssetsPayload.ts`** ✅ (Phase 2A)
   - Complete API payload contract
   - Type guards: `isReferenceValue()`, `isSimpleValue()`, `hasAttributes()`

2. **`domain/syncPolicy.ts`** ✅
   - `SyncPolicy` enum (ENABLED, REFERENCE_ONLY, SKIP)
   - Policy resolution logic

### Repository Layer (`/repositories`)

1. **`repositories/SchemaRepository.ts`** ✅
   - Schema CRUD: `upsertSchema()`, `getAllSchemas()`
   - Object type CRUD: `upsertObjectType()`, `getEnabledObjectTypes()`, `getObjectTypeByJiraId()`
   - Attribute CRUD: `upsertAttribute()`, `getAttributesForType()`, `getAttributeByFieldName()`

2. **`repositories/ObjectCacheRepository.ts`** ✅
   - Object CRUD: `upsertObject()`, `getObject()`, `getObjectByKey()`, `deleteObject()`
   - Attribute value CRUD: `upsertAttributeValue()`, `batchUpsertAttributeValues()`, `getAttributeValues()`, `deleteAttributeValues()`
   - Relations: `upsertRelation()`, `deleteRelations()`
   - Queries: `getObjectsByType()`, `countObjectsByType()`

### Service Layer (`/services`)

1. **`services/PayloadProcessor.ts`** ✅
   - **Recursive reference processing** with visited-set cycle detection
   - Processes `ObjectEntry` and `ReferencedObject` recursively (level2, level3, etc.)
   - **CRITICAL**: Only replaces attributes if `attributes[]` array is present
   - Extracts relations from references
   - Normalizes to EAV format

2. **`services/SchemaSyncService.ts`** ✅
   - Syncs schemas from Jira API: `syncAllSchemas()`
   - Discovers and stores object types and attributes
   - Returns enabled types for sync orchestration

3. **`services/ObjectSyncService.ts`** ✅
   - Full sync: `syncObjectType()` - syncs all objects of an enabled type
   - Incremental sync: `syncIncremental()` - syncs objects updated since timestamp
   - Single object sync: `syncSingleObject()` - for refresh operations
   - Recursive processing via `PayloadProcessor`
   - Respects `SyncPolicy` (ENABLED vs REFERENCE_ONLY)

4. **`services/QueryService.ts`** ✅
   - Universal query builder (DB → TypeScript)
   - `getObject()` - reconstruct single object
   - `getObjects()` - list objects of type
   - `countObjects()` - count by type
   - `searchByLabel()` - search by label

5. **`services/RefreshService.ts`** ✅
   - Force-refresh-on-read with deduplication
   - Locking mechanism prevents duplicate refresh operations
   - Timeout protection (30s)

6. **`services/WriteThroughService.ts`** ✅
   - Write-through updates: Jira API → DB cache
   - Builds Jira update payload from field updates
   - Uses same normalization logic as sync

7. **`services/ServiceFactory.ts`** ✅
   - Singleton factory for all services
   - Initializes all dependencies
   - Single entry point: `getServices()`

### API Layer (`/api`)

1. **`api/controllers/ObjectsController.ts`** ✅
   - `GET /api/v2/objects/:type` - List objects
   - `GET /api/v2/objects/:type/:id?refresh=true` - Get object (with force refresh)
   - `PUT /api/v2/objects/:type/:id` - Update object

2. **`api/controllers/SyncController.ts`** ✅
   - `POST /api/v2/sync/schemas` - Sync all schemas
   - `POST /api/v2/sync/objects` - Sync all enabled types
   - `POST /api/v2/sync/objects/:typeName` - Sync single type

3. **`api/routes/v2.ts`** ✅
   - V2 routes mounted at `/api/v2`
   - Feature flag: `USE_V2_API=true` enables routes
   - All routes require authentication

### Integration (`/backend/src/index.ts`)

✅ V2 routes wired with feature flag  
✅ Token management for new `JiraAssetsClient`  
✅ Backward compatible with old services

---

## 🔧 Key Features Implemented

### 1. Recursive Reference Processing ✅

- **Cycle detection**: Visited set using `objectId:objectKey` keys
- **Recursive expansion**: Processes `referencedObject.attributes[]` (level2, level3, etc.)
- **Preserves shallow objects**: Doesn't wipe attributes if `attributes[]` absent

### 2. Sync Policy Enforcement ✅

- **ENABLED**: Full sync with all attributes
- **REFERENCE_ONLY**: Cache minimal metadata for references
- **SKIP**: Unknown types skipped

### 3. Attribute Replacement Logic ✅

**CRITICAL RULE**: Only replaces attributes if `attributes[]` array is present in API response.

```typescript
if (shouldCacheAttributes) {
  // attributes[] present - full replace
  await deleteAttributeValues(objectId);
  await batchUpsertAttributeValues(...);
}
// If attributes[] absent - keep existing attributes
```

### 4. Write-Through Updates ✅

1. Build Jira update payload
2. Send to Jira Assets API
3. Fetch fresh data
4. Update DB cache using same normalization

### 5. Force Refresh with Deduping ✅

- Lock mechanism prevents duplicate refreshes
- Timeout protection (30s)
- Concurrent reads allowed

---

## 📁 File Structure

```
backend/src/
├── domain/
│   ├── jiraAssetsPayload.ts        ✅ Phase 2A
│   └── syncPolicy.ts               ✅ New
├── infrastructure/
│   └── jira/
│       └── JiraAssetsClient.ts    ✅ New (pure API)
├── repositories/
│   ├── SchemaRepository.ts        ✅ New
│   └── ObjectCacheRepository.ts   ✅ New
├── services/
│   ├── PayloadProcessor.ts        ✅ New (recursive)
│   ├── SchemaSyncService.ts       ✅ New
│   ├── ObjectSyncService.ts       ✅ New
│   ├── QueryService.ts            ✅ New
│   ├── RefreshService.ts          ✅ New
│   ├── WriteThroughService.ts     ✅ New
│   └── ServiceFactory.ts          ✅ New
└── api/
    ├── controllers/
    │   ├── ObjectsController.ts   ✅ New
    │   └── SyncController.ts      ✅ New
    └── routes/
        └── v2.ts                  ✅ New
```

---

## 🚀 Usage (Feature Flag)

### Enable V2 API

```bash
# .env
USE_V2_API=true
```

### New Endpoints

```
GET    /api/v2/objects/:type                    # List objects
GET    /api/v2/objects/:type/:id?refresh=true   # Get object (with refresh)
PUT    /api/v2/objects/:type/:id                # Update object

POST   /api/v2/sync/schemas                     # Sync all schemas
POST   /api/v2/sync/objects                     # Sync all enabled types
POST   /api/v2/sync/objects/:typeName           # Sync single type
```

---

## ✅ API Payload Contract Compliance

All services correctly handle:

- ✅ `objectEntries[]` → `ObjectEntry[]`
- ✅ `ObjectEntry.attributes[]` → `ObjectAttribute[]` (optional)
- ✅ `ObjectAttribute.objectAttributeValues[]` → `ObjectAttributeValue` union
- ✅ `ReferencedObject.attributes[]` → Recursive (level2+)
- ✅ Cycle detection with visited sets
- ✅ **CRITICAL**: Don't wipe attributes if `attributes[]` absent on shallow objects

---

## 🧪 Testing Status

**Compilation**: ✅ New code compiles without errors (pre-existing TypeScript config issues unrelated)

**Ready for Testing**:
1. Enable `USE_V2_API=true`
2. Test new endpoints
3. Verify recursive reference processing
4. Verify attribute replacement logic
5. Verify write-through updates

---

## 📋 Next Steps (Phase 3)

### Step 1: Test V2 API ✅ (Ready)

- [ ] Enable feature flag
- [ ] Test schema sync endpoint
- [ ] Test object sync endpoint
- [ ] Test object read endpoint
- [ ] Test object write endpoint
- [ ] Verify recursive references processed
- [ ] Verify attribute replacement logic

### Step 2: Migrate Existing Endpoints

After V2 API is validated:

- [ ] Update `routes/objects.ts` to use new services
- [ ] Update `routes/cache.ts` to use new services
- [ ] Update `routes/schema.ts` to use new services

### Step 3: Delete Old Code

After migration complete:

- [ ] Delete `services/jiraAssets.ts` (merge remaining business logic first)
- [ ] Delete `services/jiraAssetsClient.ts` (replaced by infrastructure client)
- [ ] Delete `services/cacheStore.old.ts`
- [ ] Delete `services/normalizedCacheStore.ts` (replace with repositories)
- [ ] Delete `services/queryBuilder.ts` (functionality in QueryService)
- [ ] Delete `services/schemaDiscoveryService.ts` (replaced by SchemaSyncService)
- [ ] Delete `services/schemaCacheService.ts` (merged into SchemaRepository)
- [ ] Delete `services/schemaConfigurationService.ts` (functionality moved to SchemaRepository)
- [ ] Delete `services/schemaMappingService.ts` (deprecated)
- [ ] Delete `services/syncEngine.ts` (replaced by ObjectSyncService)
- [ ] Delete `services/cmdbService.ts` (functionality split into QueryService + WriteThroughService + RefreshService)

---

## ⚠️ Important Notes

1. **No Functional Changes Yet**: Old code still runs in parallel
2. **Feature Flag Required**: V2 API only active when `USE_V2_API=true`
3. **Token Management**: New client receives tokens from middleware (same as old)
4. **Database Schema**: Uses existing normalized EAV schema (no migration needed)

---

**End of Phase 2B + 3 Implementation Status**