# QR Scanner Module Development Progress

## Project Goal

Create a self-contained, portable QR scanning page module that can be easily integrated into other WeChat Mini Programs. The module should include all scanning functionality in a single directory and accept an entry query parameter to redirect to different pages upon successful scan and verification.

## Feature Checklist - Extracted from Existing Code

### ✅ Core QR Processing
- [ ] **WebAssembly QR Tool Integration** - `qrtool.wx.js` library for QR code processing (TODO: Add library)
- [ ] **Dual Processing Modes**:
  - [ ] Worker-based processing (iPhone devices) - `worker/index.js` (TODO: Implement)
  - [ ] Synchronous processing (Android devices) - `precheck.js` (TODO: Implement)
- [ ] **QR Pattern Validation** - Emblem-specific QR code pattern matching (TODO: Add validation)
- [ ] **Frame Pre-checking** - Validate QR frames before full processing (TODO: Implement)
- [ ] **Angle Detection** - QR code angle detection and correction (TODO: Implement)

### ✅ Camera System
- [x] **Native Camera Interface** - WeChat camera component integration ✅
- [ ] **Web-view Camera Fallback** - `pages/camwebview/` for problematic devices (TODO: Add fallback)
- [ ] **Device-specific Camera Rules** - API-driven zoom and camera settings per phone model (TODO: Implement API integration)
- [ ] **Dynamic Zoom Control** - Initial zoom + QR-found zoom adjustment (TODO: Implement)
- [x] **Torch/Flash Control** - Manual and automatic torch management ✅
- [ ] **Auto-torch Detection** - API-based torch recommendation system (TODO: Implement API integration)

### ✅ UI Components & Visual Feedback
- [x] **QR Targeting Overlay** - Animated corner arcs for QR positioning ✅
- [x] **Visual State Indicators** - Progress states (searching, found, verifying) ✅
- [x] **Hint Text System** - Dynamic user guidance messages ✅
- [x] **Debug Overlay** - Development/diagnostic information display ✅
- [x] **Modal System**: ✅
  - [x] Verification spinner (`verifyspin`) ✅
  - [x] Failed verification (`verifyfailed`) ✅
  - [x] Scan guide tutorial (`scanguide`) ✅
  - [x] Service modal (`servicemodal`) ✅
  - [x] Tooltip component (`tooltip`) ✅

### ✅ API Integration & Data Flow
- [ ] **Image Upload System** - Multi-frame submission to backend
- [ ] **Verification Pipeline** - QR code verification with themblem.com API
- [ ] **Camera Rules API** - Device-specific camera configuration fetching
- [ ] **Auto-torch API** - Torch recommendation based on QR code
- [ ] **Event Tracking** - Frame upload and analytics events
- [ ] **Session Management** - Unique session ID generation and tracking

### ✅ Phone Model & Runtime Configuration
- [ ] **Device Detection** - Phone model identification and global data storage
- [ ] **Processing Mode Selection** - Worker vs synchronous based on device type
- [ ] **Camera Sensitivity Adjustment** - Device-specific camera sensitivity settings
- [ ] **Performance Optimization** - Frame upload throttling and batch processing

### ✅ Navigation & Integration
- [x] **Entry Point Configuration** - Support for return page query parameter ✅
- [x] **Return Page Routing** - Navigate to specified page after successful scan and verification ✅

### ✅ Error Handling & Recovery
- [ ] **Verification Failure Flow** - Retry and service contact options
- [ ] **Upload Failure Recovery** - Network error handling
- [ ] **Worker Failure Fallback** - Graceful degradation to sync mode
- [ ] **Camera Permission Handling** - User permission flow management

### ✅ Assets & Resources
- [ ] **Static Image Assets**:
  - [ ] QR targeting arcs (`/static/arc.png`)
  - [ ] QR positioning markers (`/static/qrmarkers.png`) 
  - [ ] UI action icons (`/assets/play-button.png`, `/assets/flash-button.png`)
- [ ] **WebAssembly Binary** - `qrtool.wx.js` QR processing library
- [ ] **Animation Assets** - Lottie animations for loading states

## Module Structure Design

```
/qr-scanner-module/
├── qr-scanner.js           # Main page logic
├── qr-scanner.wxml         # UI template  
├── qr-scanner.wxss         # Styling
├── qr-scanner.json         # Page configuration
├── lib/
│   ├── qrtool.wx.js        # WebAssembly QR library
│   ├── precheck.js         # QR validation logic
│   ├── upload.js           # API communication
│   └── utils.js            # Utility functions
├── components/             # UI components
│   ├── tooltip/
│   ├── verifyspin/  
│   ├── verifyfailed/
│   ├── scanguide/
│   └── servicemodal/
├── worker/
│   └── index.js            # WebAssembly worker
└── assets/                 # Static resources
    ├── images/
    └── animations/
```

## Integration Requirements

### Required Query Parameters
- `return_page` - Target page to navigate to after successful verification

### Required Global Dependencies
- WeChat Mini Program camera API
- WebAssembly support  
- Worker thread support (iOS)
- Canvas 2D context for image processing

### External API Dependencies
- `{server_url}/api/v1/camera-rules/` - Camera configuration
- `{server_url}/api/v1/check-auto-torch/` - Torch recommendations  
- Verification endpoint for QR code validation
- Event tracking endpoints

## Success Criteria

1. **Self-contained Module** - All functionality within single directory
2. **Platform Portability** - Easy integration into other mini programs
3. **Device Compatibility** - Support for iOS/Android with appropriate fallbacks
4. **Performance Optimization** - Efficient WebAssembly + Worker threading  
5. **Robust Error Handling** - Graceful failure modes and user feedback
6. **Configurable Integration** - Flexible redirect and mode parameters
7. **Asset Independence** - Bundled resources with minimal external dependencies

## Current Status: PLANNING PHASE ⏳

Next steps:
1. Create module directory structure
2. Extract and consolidate existing code
3. Implement portable integration interface
4. Test cross-platform compatibility