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+# 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