# Active Context

## Current Work
- Implementing authentication system for DocuLens
- Securing all API endpoints
- Adding user management functionality
- Finalizing image description functionality

## Recent Changes
- Added Flask-Login for backend authentication
- Created auth.py for user management
- Added Login component to frontend
- Protected all API routes
- Added session management
- Implemented user authentication flow
- Added image description functionality:
  - Added dedicated /api/image-description endpoint
  - Implemented image description processing pipeline
  - Created ImageDescription React component
  - Added new navigation tab for Image Description
  - Fixed image handling to use proper Gemini Vision API format
  - Implemented base64 encoding with inlineData format for images
  - Added comprehensive error handling and debugging
- Fixed Google Generative AI integration:
  - Updated package name from 'google-genai' to 'google-generativeai'
  - Upgraded to latest version 0.3.1
  - Completely rewrote all API call functions to use the simpler format for v0.3.1
  - Removed use of genai.types.Content and genai.types.Part classes that don't exist in v0.3.1
  - Fixed image description functionality to properly use inline_data format
  - Fixed the error with 'upload_blob' method by using direct inline data approach
  - Updated Dockerfile to install the correct package
  - Added advanced image optimization to improve API reliability:
    - Resizing large images (max 1600px on any side)
    - Converting to RGB format (handling transparency)
    - Optimizing quality and compression
  - Implemented timeout handling with retry logic:
    - Added exponential backoff retries (3 attempts)
    - Added specific handling for 504 Deadline Exceeded errors
    - Optimized output token limits to avoid timeouts
- Dependency and prompt updates:
  - Upgraded OCRmyPDF to version 16.10.0
  - Added pikepdf 9.5.2 as a dependency to fix OCRmyPDF compatibility issue
  - Removed the image_desc prompt while keeping ocr, ocr_correction, and translation prompts
  - Added fallback logic for image description functionality to use a simple default prompt

## Next Steps
1. Test authentication system thoroughly
2. Test image description functionality
3. Add password change functionality
4. Consider adding:
   - Password reset capability
   - Account lockout after failed attempts
   - Session timeout settings
5. Update documentation with authentication and image description details