# Robust CKG and TKG System Design

## Overview

This document outlines the design for a robust Component Knowledge Graph (CKG) and Template Knowledge Graph (TKG) system that provides intelligent tech-stack recommendations based on template features, permutations, and combinations.

## System Architecture

### 1. Component Knowledge Graph (CKG)
- **Purpose**: Manages feature permutations and combinations with tech-stack mappings
- **Storage**: Neo4j graph database
- **Key Entities**: Features, Permutations, Combinations, TechStacks, Technologies

### 2. Template Knowledge Graph (TKG)
- **Purpose**: Manages template-feature relationships and overall tech recommendations
- **Storage**: Neo4j graph database
- **Key Entities**: Templates, Features, Technologies, TechStacks

## Enhanced Graph Schema

### Node Types

#### CKG Nodes
```
Feature {
  id: String
  name: String
  description: String
  feature_type: String (essential|suggested|custom)
  complexity: String (low|medium|high)
  template_id: String
  display_order: Number
  usage_count: Number
  user_rating: Number
  is_default: Boolean
  created_by_user: Boolean
}

Permutation {
  id: String
  template_id: String
  feature_sequence: String (JSON array)
  sequence_length: Number
  complexity_score: Number
  usage_frequency: Number
  created_at: DateTime
  performance_score: Number
  compatibility_score: Number
}

Combination {
  id: String
  template_id: String
  feature_set: String (JSON array)
  set_size: Number
  complexity_score: Number
  usage_frequency: Number
  created_at: DateTime
  synergy_score: Number
  compatibility_score: Number
}

TechStack {
  id: String
  combination_id: String (optional)
  permutation_id: String (optional)
  frontend_tech: String (JSON array)
  backend_tech: String (JSON array)
  database_tech: String (JSON array)
  devops_tech: String (JSON array)
  mobile_tech: String (JSON array)
  cloud_tech: String (JSON array)
  testing_tech: String (JSON array)
  ai_ml_tech: String (JSON array)
  tools_tech: String (JSON array)
  confidence_score: Number
  complexity_level: String
  estimated_effort: String
  created_at: DateTime
  ai_model: String
  analysis_version: String
}

Technology {
  name: String
  category: String (frontend|backend|database|devops|mobile|cloud|testing|ai_ml|tools)
  type: String (framework|library|service|tool)
  version: String
  popularity: Number
  description: String
  website: String
  documentation: String
  compatibility: String (JSON array)
  performance_score: Number
  learning_curve: String (easy|medium|hard)
  community_support: String (low|medium|high)
}
```

#### TKG Nodes
```
Template {
  id: String
  type: String
  title: String
  description: String
  category: String
  complexity: String
  is_active: Boolean
  created_at: DateTime
  updated_at: DateTime
  usage_count: Number
  success_rate: Number
}

Feature {
  id: String
  name: String
  description: String
  feature_type: String
  complexity: String
  display_order: Number
  usage_count: Number
  user_rating: Number
  is_default: Boolean
  created_by_user: Boolean
  dependencies: String (JSON array)
  conflicts: String (JSON array)
}

Technology {
  name: String
  category: String
  type: String
  version: String
  popularity: Number
  description: String
  website: String
  documentation: String
  compatibility: String (JSON array)
  performance_score: Number
  learning_curve: String
  community_support: String
  cost: String (free|freemium|paid)
  scalability: String (low|medium|high)
  security_score: Number
}

TechStack {
  id: String
  template_id: String
  template_type: String
  status: String (active|deprecated|experimental)
  ai_model: String
  analysis_version: String
  processing_time_ms: Number
  created_at: DateTime
  last_analyzed_at: DateTime
  confidence_scores: String (JSON object)
  reasoning: String (JSON object)
}
```

### Relationship Types

#### CKG Relationships
```
Template -[:HAS_FEATURE]-> Feature
Feature -[:REQUIRES_TECHNOLOGY]-> Technology
Permutation -[:HAS_ORDERED_FEATURE {sequence_order: Number}]-> Feature
Combination -[:CONTAINS_FEATURE]-> Feature
Permutation -[:RECOMMENDS_TECH_STACK]-> TechStack
Combination -[:RECOMMENDS_TECH_STACK]-> TechStack
TechStack -[:RECOMMENDS_TECHNOLOGY {category: String, confidence: Number}]-> Technology
Technology -[:SYNERGY {score: Number}]-> Technology
Technology -[:CONFLICTS {severity: String}]-> Technology
Feature -[:DEPENDS_ON {strength: Number}]-> Feature
Feature -[:CONFLICTS_WITH {severity: String}]-> Feature
```

#### TKG Relationships
```
Template -[:HAS_FEATURE]-> Feature
Template -[:HAS_TECH_STACK]-> TechStack
Feature -[:REQUIRES_TECHNOLOGY]-> Technology
TechStack -[:RECOMMENDS_TECHNOLOGY {category: String, confidence: Number}]-> Technology
Technology -[:SYNERGY {score: Number}]-> Technology
Technology -[:CONFLICTS {severity: String}]-> Technology
Feature -[:DEPENDS_ON {strength: Number}]-> Feature
Feature -[:CONFLICTS_WITH {severity: String}]-> Feature
Template -[:SIMILAR_TO {similarity: Number}]-> Template
```

## Enhanced Services

### 1. Advanced Combinatorial Engine
- Smart permutation generation based on feature dependencies
- Compatibility-aware combination generation
- Performance optimization with caching
- Feature interaction scoring

### 2. Intelligent Tech Stack Analyzer
- AI-powered technology recommendations
- Context-aware tech stack generation
- Performance and scalability analysis
- Cost optimization suggestions

### 3. Relationship Manager
- Automatic dependency detection
- Conflict resolution
- Synergy identification
- Performance optimization

### 4. Recommendation Engine
- Multi-factor recommendation scoring
- User preference learning
- Success rate tracking
- Continuous improvement

## API Enhancements

### CKG APIs
```
GET /api/ckg-tech-stack/template/:templateId
GET /api/ckg-tech-stack/permutations/:templateId
GET /api/ckg-tech-stack/combinations/:templateId
GET /api/ckg-tech-stack/compare/:templateId
GET /api/ckg-tech-stack/recommendations/:templateId
POST /api/ckg-tech-stack/analyze-compatibility
GET /api/ckg-tech-stack/synergies
GET /api/ckg-tech-stack/conflicts
```

### TKG APIs
```
GET /api/tkg/template/:templateId/tech-stack
GET /api/tkg/template/:templateId/features
GET /api/tkg/template/:templateId/recommendations
POST /api/tkg/template/:templateId/analyze
GET /api/tkg/technologies/synergies
GET /api/tkg/technologies/conflicts
GET /api/tkg/templates/similar/:templateId
```

## Implementation Strategy

### Phase 1: Enhanced CKG Service
1. Improve permutation/combination generation
2. Add intelligent tech stack analysis
3. Implement relationship scoring
4. Add performance optimization

### Phase 2: Advanced TKG Service
1. Enhance template-feature relationships
2. Add technology synergy detection
3. Implement conflict resolution
4. Add recommendation scoring

### Phase 3: Integration & Optimization
1. Connect CKG and TKG systems
2. Implement cross-graph queries
3. Add performance monitoring
4. Implement continuous learning

## Benefits

1. **Intelligent Recommendations**: AI-powered tech stack suggestions
2. **Relationship Awareness**: Understanding of feature dependencies and conflicts
3. **Performance Optimization**: Cached and optimized queries
4. **Scalability**: Handles large numbers of templates and features
5. **Flexibility**: Supports various recommendation strategies
6. **Learning**: Continuous improvement based on usage patterns
