chore: update camera documentation

docs/camera-implementation.md

@@ -42,6 +42,17 @@ Component for photo capture and selection.
 - Image cropping capabilities
 - File selection fallback
 - Unified interface for different platforms
+- Progress feedback during upload
+- Comprehensive error handling
+
+**Camera Access Flow:**
+
+1. User initiates photo capture
+2. Platform-specific camera access is requested
+3. Image is captured or selected
+4. Optional cropping is performed
+5. Image is processed and uploaded
+6. URL is returned to caller
 
 ### ImageMethodDialog.vue
 
@@ -54,6 +65,13 @@ Component for selecting image input method.
 - Support for image cropping
 - URL-based image handling
 
+**Camera Access Flow:**
+
+1. User selects camera option
+2. PhotoDialog is opened for capture
+3. Captured image is processed
+4. Image is returned to parent component
+
 ### SharedPhotoView.vue
 
 Component for handling shared photos.
@@ -65,6 +83,32 @@ Component for handling shared photos.
 - Server upload integration
 - Temporary storage management
 
+**Photo Processing Flow:**
+
+1. Photo is shared to application
+2. Stored temporarily in IndexedDB
+3. User chooses usage (gift/profile)
+4. Image is processed accordingly
+5. Server upload is performed
+
+### ContactQRScanShowView.vue
+
+Component for QR code scanning in contact sharing.
+
+**Key Features:**
+- QR code scanning interface
+- Camera controls (start/stop)
+- Platform-specific implementations
+- Error handling and status feedback
+
+**Camera Access Flow:**
+
+1. User initiates scanning
+2. Camera permissions are checked
+3. Camera stream is initialized
+4. QR codes are detected in real-time
+5. Results are processed
+
 ## Services
 
 ### QRScanner Services
@@ -99,9 +143,11 @@ Web-specific implementation of platform features.
 
 **Camera Capabilities:**
 
-- Uses HTML5 file input with capture attribute
+- Uses HTML5 file input with capture attribute for mobile
+- Uses getUserMedia API for desktop webcam access
 - Falls back to file selection if camera unavailable
 - Processes captured images for consistent format
+- Handles both mobile and desktop browser environments
 
 #### CapacitorPlatformService
 
@@ -113,6 +159,7 @@ Native implementation using Capacitor.
 - Supports image editing
 - Configures high-quality image capture
 - Handles base64 image processing
+- Provides native camera UI
 
 #### ElectronPlatformService
 
@@ -122,6 +169,7 @@ Desktop implementation (currently unimplemented).
 
 - Camera functionality not yet implemented
 - Planned to use Electron's media APIs
+- Will support desktop camera access
 
 ## Camera Usage Scenarios
 
@@ -173,21 +221,147 @@ Desktop implementation (currently unimplemented).
 4. User chooses usage (gift/profile)
 5. Image is processed accordingly
 
-### Image Upload and Processing
+### QR Code Scanning
 
 **Implementation:**
-- Secure server upload
+- Platform-specific scanning components
-- Authentication handling
+- Real-time camera feed processing
-- Image format standardization
+- QR code detection and validation
+- Contact information processing
 - Error handling and retry
-- Progress feedback
 
 **Flow:**
-1. Image is prepared for upload
+1. User initiates QR scanning
-2. Authentication token is obtained
+2. Camera permissions are checked
-3. Multipart form data is created
+3. Camera stream is initialized
-4. Upload progress is monitored
+4. QR codes are detected
-5. Server URL is returned
+5. Contact information is processed
+
+### QR Code Workflow
+
+**Implementation Details:**
+
+The QR code scanning workflow is implemented across multiple components and services to provide a seamless experience for contact sharing and verification. The system supports both web-based and native implementations through platform-specific services.
+
+#### QR Code Generation
+
+**Contact QR Codes:**
+- Generated using `qrcode.vue` component
+- Contains encrypted contact information
+- Includes user ID and verification data
+- Supports offline sharing
+- Implements error correction
+
+**QR Code Format:**
+```json
+{
+  "type": "contact",
+  "userId": "encrypted_user_id",
+  "timestamp": "creation_time",
+  "version": "qr_code_version",
+  "data": "encrypted_contact_data"
+}
+```
+
+#### QR Code Scanning Workflow
+
+**1. Initiation:**
+- User selects "Scan QR Code" option
+- Platform-specific scanner is initialized
+- Camera permissions are verified
+- Appropriate scanner component is loaded
+
+**2. Platform-Specific Implementation:**
+
+*Web Implementation:*
+- Uses `qrcode-stream` for real-time scanning
+- Supports both front and back cameras
+- Implements continuous scanning
+- Provides visual feedback for scanning status
+- Handles browser compatibility issues
+
+*Native Implementation (Capacitor):*
+- Uses `@capacitor-mlkit/barcode-scanning`
+- Leverages native camera capabilities
+- Provides optimized scanning performance
+- Supports multiple barcode formats
+- Implements native permission handling
+
+**3. Scanning Process:**
+- Camera stream is initialized
+- Real-time frame analysis begins
+- QR codes are detected and decoded
+- Validation of QR code format
+- Processing of contact information
+
+**4. Contact Processing:**
+- Decryption of contact data
+- Validation of user information
+- Verification of timestamp
+- Check for duplicate contacts
+- Processing of shared data
+
+**5. Error Handling:**
+- Invalid QR code format
+- Expired QR codes
+- Duplicate contact attempts
+- Network connectivity issues
+- Permission denials
+- Camera access problems
+
+**6. Success Flow:**
+- Contact information is extracted
+- User is prompted for confirmation
+- Contact is added to user's list
+- Success notification is displayed
+- Camera resources are cleaned up
+
+#### Security Measures
+
+**QR Code Security:**
+- Encryption of contact data
+- Timestamp validation
+- Version checking
+- User verification
+- Rate limiting for scans
+
+**Data Protection:**
+- Secure transmission of contact data
+- Validation of QR code authenticity
+- Prevention of duplicate scans
+- Protection against malicious codes
+- Secure storage of contact information
+
+#### User Experience
+
+**Scanning Interface:**
+- Clear visual feedback
+- Camera preview
+- Scanning status indicators
+- Error messages
+- Success confirmations
+
+**Accessibility:**
+- Support for different screen sizes
+- Clear instructions
+- Error recovery options
+- Alternative input methods
+- Offline capability
+
+#### Performance Considerations
+
+**Optimization:**
+- Efficient camera resource usage
+- Quick QR code detection
+- Minimal processing overhead
+- Battery usage optimization
+- Memory management
+
+**Platform-Specific Optimizations:**
+- Web: Optimized for browser performance
+- Native: Leverages device capabilities
+- Desktop: Efficient resource usage
+- Mobile: Battery and performance balance
 
 ## Platform-Specific Considerations
 
@@ -196,18 +370,25 @@ Desktop implementation (currently unimplemented).
 - Requires `NSCameraUsageDescription` in Info.plist
 - Supports both front and back cameras
 - Implements proper permission handling
+- Uses native camera UI through Capacitor
+- Handles photo library access
 
 ### Android
 
 - Requires camera permissions in manifest
 - Supports both front and back cameras
 - Handles permission requests through Capacitor
+- Uses native camera UI
+- Manages photo library access
 
 ### Web
 
 - Requires HTTPS for camera access
 - Implements fallback mechanisms
 - Handles browser compatibility issues
+- Uses getUserMedia API on desktop
+- Uses file input with capture on mobile
+- Supports multiple input methods
 
 ## Error Handling
 
@@ -218,6 +399,8 @@ Desktop implementation (currently unimplemented).
 3. Camera in use by another application
 4. HTTPS required
 5. Browser compatibility issues
+6. Upload failures
+7. Image processing errors
 
 ### Error Response
 
@@ -225,6 +408,7 @@ Desktop implementation (currently unimplemented).
 - Troubleshooting tips
 - Clear instructions for resolution
 - Platform-specific guidance
+- Graceful fallbacks
 
 ## Security Considerations
 
@@ -233,12 +417,16 @@ Desktop implementation (currently unimplemented).
 - Explicit permission requests
 - Permission state tracking
 - Graceful handling of denied permissions
+- Platform-specific permission handling
+- Secure permission storage
 
 ### Data Handling
 
 - Secure image processing
 - Proper cleanup of camera resources
 - No persistent storage of camera data
+- Secure server upload
+- Temporary storage management
 
 ## Best Practices
 
@@ -249,6 +437,7 @@ Desktop implementation (currently unimplemented).
 3. Handle all error conditions
 4. Provide clear user feedback
 5. Implement proper cleanup
+6. Use platform-specific optimizations
 
 ### Performance
 
@@ -256,6 +445,8 @@ Desktop implementation (currently unimplemented).
 2. Implement proper resource cleanup
 3. Handle camera switching efficiently
 4. Manage memory usage
+5. Optimize image processing
+6. Handle upload efficiently
 
 ### User Experience
 
@@ -264,6 +455,7 @@ Desktop implementation (currently unimplemented).
 3. Helpful error messages
 4. Smooth camera switching
 5. Responsive UI feedback
+6. Platform-appropriate UI
 
 ## Future Improvements
 
@@ -274,12 +466,15 @@ Desktop implementation (currently unimplemented).
 3. Improve error handling
 4. Enhance user feedback
 5. Optimize performance
+6. Add image compression options
 
 ### Known Issues
 
 1. Electron camera implementation pending
 2. Some browser compatibility limitations
 3. Platform-specific quirks to address
+4. Mobile browser camera access limitations
+5. Image upload performance on slow connections
 
 ## Dependencies
 
@@ -288,6 +483,7 @@ Desktop implementation (currently unimplemented).
 - `@capacitor-mlkit/barcode-scanning`
 - `qrcode-stream`
 - `vue-picture-cropper`
+- `@capacitor/camera`
 - Platform-specific camera APIs
 
 ## Testing
@@ -299,6 +495,8 @@ Desktop implementation (currently unimplemented).
 3. Error conditions
 4. Platform compatibility
 5. Performance metrics
+6. Upload scenarios
+7. Image processing
 
 ### Test Environment
 
@@ -306,3 +504,4 @@ Desktop implementation (currently unimplemented).
 - iOS and Android devices
 - Desktop platforms
 - Various network conditions 
+- Different camera configurations