# Architecture

## Overview

**Platform Marketing Content (PMC)** es una plataforma de generación y gestión de contenido de marketing asistida por inteligencia artificial. Integra ComfyUI para generación de imágenes AI y modelos LLM para contenido textual, ofreciendo un CMS completo para equipos de marketing.

La arquitectura sigue un patrón de aplicación web full-stack con NestJS en backend y React en frontend, con integraciones a servicios de IA para automatización de contenido.

## Tech Stack

- **Backend:** NestJS 10+ + TypeScript 5.3+
- **Frontend:** React + TypeScript + Tailwind CSS + Vite
- **Database:** PostgreSQL 16 (pmc_dev)
- **Cache:** Redis 7
- **Storage:** MinIO (S3-compatible)
- **AI Art:** ComfyUI (Stable Diffusion, FLUX)
- **LLM:** Integration with OpenAI, Claude, local models
- **Auth:** JWT + Passport.js
- **Real-time:** Socket.IO (Bull queues for async jobs)

## Module Structure

```
platform_marketing_content/
├── apps/
│   ├── backend/                    # NestJS API
│   │   └── src/
│   │       ├── modules/            # Feature modules
│   │       │   ├── auth/           # Authentication (JWT, local, OAuth)
│   │       │   ├── tenants/        # Multi-tenant management
│   │       │   ├── projects/       # Marketing projects
│   │       │   ├── assets/         # Digital assets (images, videos)
│   │       │   ├── generation/     # AI content generation
│   │       │   ├── automation/     # Workflow automation
│   │       │   ├── crm/            # CRM integration
│   │       │   └── analytics/      # Analytics & reporting
│   │       ├── common/             # Shared code
│   │       │   ├── decorators/     # Custom decorators
│   │       │   ├── filters/        # Exception filters
│   │       │   ├── guards/         # Auth guards
│   │       │   ├── interceptors/   # HTTP interceptors
│   │       │   └── pipes/          # Validation pipes
│   │       ├── config/             # Configuration
│   │       ├── app.module.ts       # Root module
│   │       └── main.ts             # Bootstrap
│   │
│   └── frontend/                   # React SPA
│       └── src/
│           ├── modules/            # Feature modules
│           │   ├── auth/           # Login, register
│           │   ├── dashboard/      # Main dashboard
│           │   ├── projects/       # Project management
│           │   ├── assets/         # Asset library
│           │   ├── generation/     # AI generation UI
│           │   ├── campaigns/      # Marketing campaigns
│           │   └── analytics/      # Analytics dashboard
│           ├── shared/             # Shared components
│           │   ├── components/     # UI components
│           │   ├── hooks/          # Custom hooks
│           │   └── utils/          # Utilities
│           └── lib/                # Libraries
│
├── database/                       # Database
│   ├── schemas/                    # Schema definitions
│   └── migrations/                 # Database migrations
│
├── docs/                           # Documentation
└── orchestration/                  # Agent orchestration
```

## Database Schemas

### Core Schemas (6 schemas)

| Schema | Purpose | Key Tables |
|--------|---------|------------|
| **auth** | Authentication & users | users, sessions, oauth_accounts |
| **tenants** | Multi-tenant management | tenants, tenant_settings |
| **projects** | Marketing projects | projects, campaigns, schedules |
| **assets** | Digital asset management | assets, tags, collections |
| **generation** | AI generation | generation_jobs, templates, workflows |
| **analytics** | Metrics & reporting | events, conversions, performance |

## Data Flow Architecture

```
┌──────────────┐
│   Frontend   │ (React SPA - Port 3110)
│  (Browser)   │
└──────┬───────┘
       │ HTTP/WebSocket
       ▼
┌─────────────────────────────────────────────┐
│      Backend API (NestJS - Port 3111)       │
│  ┌─────────────────────────────────────┐   │
│  │  Controllers (REST Endpoints)       │   │
│  └────────┬────────────────────────────┘   │
│           ▼                                  │
│  ┌─────────────────────────────────────┐   │
│  │  Services (Business Logic)          │   │
│  └────────┬──────────────┬─────────────┘   │
│           │              │                  │
│           ▼              ▼                  │
│  ┌──────────────┐  ┌──────────────┐        │
│  │ Repositories │  │  Bull Queue  │        │
│  │  (TypeORM)   │  │  (Redis)     │        │
│  └──────┬───────┘  └──────┬───────┘        │
└─────────┼──────────────────┼────────────────┘
          │                  │
          ▼                  ▼
┌─────────────────┐  ┌──────────────┐
│   PostgreSQL    │  │    Redis     │
│   (Database)    │  │   (Cache)    │
└─────────────────┘  └──────────────┘

┌──────────────────────────────────────────┐
│      AI Services (External)              │
│  ┌──────────────┐  ┌──────────────┐     │
│  │   ComfyUI    │  │   LLM API    │     │
│  │  (Port 8188) │  │  (OpenAI)    │     │
│  └──────────────┘  └──────────────┘     │
└──────────────────────────────────────────┘

┌──────────────┐
│    MinIO     │ (S3-compatible storage)
│  (Port 9000) │
└──────────────┘
```

### AI Content Generation Flow

```
User requests content generation
    ↓
Frontend → POST /api/generation/create
    ↓
Backend validates request
    ↓
Create generation_job (status: pending)
    ↓
Add to Bull queue (async processing)
    ↓
Worker picks up job
    ↓
    ├─→ Text generation: Call LLM API (GPT-4, Claude)
    │   ↓
    │   Save to database
    │
    └─→ Image generation: Call ComfyUI API
        ↓
        Upload to MinIO
        ↓
        Save metadata to database
    ↓
Update job status (completed/failed)
    ↓
WebSocket notification to frontend
    ↓
User sees generated content
```

## Key Design Decisions

### 1. NestJS Framework

**Decision:** Usar NestJS en lugar de Express.js básico.

**Rationale:**
- Arquitectura modular out-of-the-box
- Dependency injection incorporado
- TypeScript first-class support
- Decorators para routing y validation
- Integración nativa con TypeORM, Bull, WebSockets

**Trade-off:** Curva de aprendizaje mayor, pero mejor estructura para proyectos grandes

### 2. Bull Queue for Async Processing

**Decision:** Procesar generaciones de IA en background con Bull.

**Rationale:**
- Generaciones pueden tardar minutos (especialmente imágenes)
- No bloquear requests HTTP
- Retry automático si falla
- Priorización de jobs
- Dashboard de monitoreo

**Implementation:**

```typescript
// generation.processor.ts
@Processor('generation')
export class GenerationProcessor {
  @Process('generate-image')
  async handleImageGeneration(job: Job) {
    const { prompt, settings } = job.data;

    // Call ComfyUI
    const result = await this.comfyUIService.generate(prompt, settings);

    // Upload to MinIO
    const url = await this.storageService.upload(result.image);

    // Save to database
    await this.generationRepository.update(job.data.id, {
      status: 'completed',
      resultUrl: url
    });
  }
}
```

### 3. MinIO for Object Storage

**Decision:** MinIO como almacenamiento S3-compatible en lugar de filesystem.

**Rationale:**
- Compatible con S3 (fácil migración a AWS S3 en producción)
- Versioning de assets
- Metadata y tags
- Pre-signed URLs para acceso controlado
- Replicación y backup

### 4. ComfyUI Integration

**Decision:** Integrar ComfyUI para generación de imágenes AI.

**Rationale:**
- Workflow visual poderoso
- Múltiples modelos (Stable Diffusion, FLUX, etc.)
- Control fino sobre generación
- Open-source y self-hosted
- API REST para integración

**Alternative:** Usar APIs directas (Replicate, Stability AI) - más simple pero menos flexible

### 5. Multi-Tenant Architecture

**Decision:** Soporte multi-tenant a nivel de aplicación.

**Rationale:**
- SaaS-ready desde el inicio
- Aislamiento de datos por tenant
- Diferentes planes y límites por tenant
- Escalable para múltiples clientes

**Implementation:** Similar a ERP-Suite (tenant_id en cada tabla, RLS opcional)

### 6. Repository Pattern with TypeORM

**Decision:** Usar Repository Pattern en lugar de Active Record.

**Rationale:**
- Mejor separación de concerns
- Facilita testing (mock repositories)
- Migrations automáticas (development)
- Type-safe queries

## Dependencies

### Critical Dependencies

| Dependency | Purpose | Criticality |
|------------|---------|-------------|
| **NestJS** | Backend framework | CRITICAL |
| **TypeORM** | ORM | CRITICAL |
| **PostgreSQL** | Database | CRITICAL |
| **Redis** | Cache, queues | HIGH |
| **Bull** | Job queues | HIGH |
| **MinIO** | Object storage | MEDIUM |
| **ComfyUI** | Image generation | MEDIUM |

### External Services

- **ComfyUI:** Image generation (local or cloud)
- **OpenAI/Claude:** Text generation
- **MinIO:** Object storage (S3-compatible)
- **Redis:** Caching and job queues

## Security Considerations

- **Authentication:** JWT with refresh tokens
- **Authorization:** Role-based (admin, user, viewer)
- **Multi-tenancy:** tenant_id isolation
- **File Upload:** Validation (type, size, malware scan)
- **API Rate Limiting:** Per tenant
- **CORS:** Configured for frontend origin
- **Input Validation:** Class-validator on DTOs
- **SQL Injection:** TypeORM parameterized queries

## Performance Optimizations

### Caching Strategy

- **Redis:** Cache generation results, frequently accessed assets
- **TTL:** Configurable per resource type
- **Invalidation:** Event-based

### Database

- Indexes on frequently queried columns
- Connection pooling
- Pagination on all list endpoints
- Lazy loading of relations

### Asset Delivery

- CDN for static assets (future)
- Image optimization (resize, compress)
- Pre-signed URLs with expiration

## Deployment Strategy

**Current:** Development environment

**Ports:**
- Frontend: 3110
- Backend: 3111
- MinIO API: 9000
- MinIO Console: 9001
- ComfyUI: 8188

**Future Production:**
- Docker containers
- Kubernetes orchestration
- AWS S3 for storage
- CloudFront CDN
- Managed PostgreSQL (RDS)
- Managed Redis (ElastiCache)

## Monitoring & Observability

**Planned:**
- NestJS Logger
- Error tracking (Sentry)
- Performance monitoring (Datadog/New Relic)
- Bull Board for queue monitoring
- Database monitoring

## Feature Modules

### Auth Module
- JWT authentication
- OAuth2 (Google, GitHub)
- Password reset
- Email verification
- Role-based access control

### Tenants Module
- Tenant management
- Settings & configuration
- Usage tracking
- Plan limits enforcement

### Projects Module
- Marketing projects
- Campaigns
- Schedules
- Team collaboration

### Assets Module
- Digital asset library
- Tags and collections
- Search and filtering
- Version control
- Sharing and permissions

### Generation Module
- AI text generation (GPT-4, Claude)
- AI image generation (ComfyUI)
- Template management
- Workflow automation
- Generation history

### Automation Module
- Scheduled generation
- Batch operations
- Webhooks
- API integrations

### CRM Module
- Contact management
- Segment creation
- Campaign targeting
- Email integration

### Analytics Module
- Performance metrics
- Conversion tracking
- Custom reports
- Dashboards

## Integration Points

### ComfyUI

**API Endpoints:**
- POST `/prompt` - Submit generation job
- GET `/history` - Get job status
- GET `/view` - Retrieve generated image

**Workflow:**
1. Build workflow JSON
2. Submit to ComfyUI
3. Poll for completion
4. Download result
5. Upload to MinIO

### LLM APIs

**OpenAI:**
```typescript
const completion = await openai.chat.completions.create({
  model: 'gpt-4',
  messages: [
    { role: 'system', content: 'You are a marketing content writer' },
    { role: 'user', content: prompt }
  ]
});
```

**Claude:**
```typescript
const message = await anthropic.messages.create({
  model: 'claude-3-opus-20240229',
  max_tokens: 1024,
  messages: [{ role: 'user', content: prompt }]
});
```

### MinIO

```typescript
// Upload file
await minioClient.putObject(
  'pmc-assets',
  fileName,
  fileBuffer,
  fileSize,
  { 'Content-Type': mimeType }
);

// Get pre-signed URL
const url = await minioClient.presignedGetObject(
  'pmc-assets',
  fileName,
  24 * 60 * 60  // 24 hours
);
```

## Future Improvements

### Short-term
- [ ] Implement real-time collaboration
- [ ] Add more AI models
- [ ] Improve asset search (full-text)
- [ ] Mobile responsive UI

### Medium-term
- [ ] Video generation support
- [ ] Social media scheduling
- [ ] A/B testing for content
- [ ] Brand kit management

### Long-term
- [ ] Marketplace for templates
- [ ] White-label solution
- [ ] Multi-language support
- [ ] Advanced analytics & ML insights

## References

- [CMS Guide](./CMS-GUIDE.md)
- [API Documentation](./API.md)
- [Contributing Guide](../CONTRIBUTING.md)
- [NestJS Documentation](https://nestjs.com/)
- [ComfyUI API](https://github.com/comfyanonymous/ComfyUI)
