# Business Logic Specification

## Overview
AI StyleGallery is a web application that enables users to transform their uploaded images using various AI-generated artistic styles through integration with external AI services.

## Core Business Requirements

### Primary User Journey
1. **Image Upload**: Users can upload personal images to their gallery
2. **Style Selection**: Users can browse and select from available AI artistic styles
3. **AI Processing**: Selected images are sent to external AI services for style transformation
4. **Result Management**: Users can view styled results and choose to keep (make permanent) or discard them
5. **Gallery Management**: Users can view their collection of original and styled images

### Key Business Rules
- **Image Privacy**: Images are private by default, users control visibility
- **Temporary Processing**: AI-styled images are initially temporary until user confirms
- **Style Availability**: Only enabled styles from active AI models are available to users
- **Provider Flexibility**: Support multiple AI service providers (ComfyUI, RunwareAI, etc.)
- **Real-time Progress**: Users receive real-time updates during AI processing

## Core Business Workflows

### 1. Image Style Transformation Workflow

#### Process Flow
```
User selects image → Opens context menu → Chooses "Change Style" →
Browses style selector → Selects style → Initiates AI processing →
Receives real-time progress updates → Views styled result →
Chooses to keep or discard the styled image
```

#### Technical Implementation
- Frontend captures user selection via Vue.js components
- Backend validates request and loads appropriate AI plugin
- Plugin handles communication with external AI service
- Real-time progress tracked via WebSocket (ComfyUI) or polling (other providers)
- Styled image saved to storage and database record created
- User notified of completion and can manage result

#### Success Criteria
- Processing completes within reasonable time (typically 30-180 seconds)
- User receives clear progress feedback during processing
- Styled image maintains acceptable quality and resolution
- User can easily keep or discard results

### 2. Gallery Management Workflow

#### Image Synchronization
- Automatic sync between filesystem and database
- Missing files removed from database
- New files added to database with metadata
- Maintains data consistency across application restarts

#### Visibility Rules
- **Public Images**: Visible to all users
- **Private Images**: Only visible to image owner
- **Temporary Images**: Visible to owner during processing/review period
- **Authenticated Users**: See all their own images
- **Unauthenticated Users**: See only public images and their temporary results

### 3. Admin Management Workflow

#### Content Management
- **Styles**: Create, edit, enable/disable artistic styles
- **AI Models**: Configure available AI models and their parameters
- **API Providers**: Set up connections to external AI services
- **Users**: Manage user accounts and assign roles
- **Settings**: Configure application-wide settings

#### Quality Assurance
- Preview images for styles before publishing
- Test connections to AI services
- Monitor processing success rates
- Manage storage and cleanup old temporary files

## Business Entities & Relationships

### Primary Entities
- **Users**: Account holders with roles and preferences
- **Images**: Uploaded files with metadata and processing status
- **Styles**: AI artistic styles with prompts and parameters
- **AI Models**: Specific AI models (e.g., Stable Diffusion variants)
- **API Providers**: External AI services (ComfyUI, RunwareAI, etc.)

### Key Relationships
- **User → Images**: One-to-many (users own multiple images)
- **Image → Style**: Many-to-one (multiple images can use same style)
- **Style → AI Model**: Many-to-one (multiple styles can use same model)
- **AI Model → API Provider**: Many-to-one (multiple models can use same provider)
- **Image → Original Image**: Self-referencing (styled images reference originals)

## Business Constraints & Validation Rules

### Data Validation
- **Image Files**: Must be valid image formats (JPEG, PNG, WebP), max 10MB
- **Style Prompts**: Required text describing desired artistic transformation
- **API URLs**: Must be valid, accessible endpoints
- **User Email**: Must be unique and valid format

### Business Rules
- **Temporary Image Expiry**: Styled images expire if not kept within timeframe
- **Storage Limits**: Maximum storage per user or globally
- **API Rate Limits**: Respect external service limitations
- **Processing Queue**: Handle multiple simultaneous requests appropriately

## Success Metrics

### User Experience
- **Processing Speed**: Average time under 60 seconds for style transformation
- **Success Rate**: 95%+ successful transformations
- **User Retention**: Users return and process multiple images
- **Feature Adoption**: High usage of style transformation features

### Technical Performance
- **System Uptime**: 99.5%+ availability
- **Response Times**: Gallery loads under 2 seconds
- **Error Rates**: Under 1% processing failures
- **Storage Efficiency**: Automatic cleanup of unused temporary files

## Future Enhancement Opportunities

### Potential Features
- **Batch Processing**: Apply styles to multiple images simultaneously
- **Style Chaining**: Apply multiple styles in sequence
- **Custom Styles**: User-created style presets
- **Social Features**: Share styled images with other users
- **Advanced Filters**: Search and filter gallery by style, date, etc.
- **Mobile Optimization**: Enhanced mobile experience
- **API Access**: Third-party integrations via API

### Scalability Considerations
- **Multiple AI Providers**: Load balancing across providers
- **CDN Integration**: Faster image delivery globally
- **Database Optimization**: Handle large numbers of images efficiently
- **Caching Strategy**: Reduce redundant AI processing