# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Project Overview

This is a WeChat Mini Program called "徵象" (emblem-scanner) for QR code scanning and processing. The app connects to the Themblem service for QR code verification and includes camera functionality with device-specific optimizations.

## Architecture

**Main App Structure:**
- `app.js` - Main application entry point with global data and worker initialization
- `utils.js` - Utility functions for camera rules, device detection, and QR code extraction
- `pages/` - WeChat Mini Program pages (index, camera, debug, webview, etc.)
- `components/` - Reusable UI components (scanguide, tooltips, modals, etc.)
- `worker/` - WebAssembly worker thread for QR code processing using qrtool library
- `static/` - Static assets and resources

**Key Components:**
- Camera system with device-specific zoom rules fetched from API
- WebAssembly-based QR processing in worker thread for performance
- New emblemscanner (`pages/emblemscanner/`) for unified QR scanning experience
- Legacy camera page (`pages/camera/`) kept for reference to worker integration
- Upload and verification system connecting to themblem.com API

**Global Data:**
- `server_url`: 'https://themblem.com' - main API endpoint
- `session_id`: Generated unique session identifier
- `worker`: WebAssembly worker for QR processing

## Development Commands

This is a WeChat Mini Program project. Development is done through WeChat Developer Tools IDE.

**Linting:**
```bash
# ESLint configuration available but no npm scripts defined
# Lint manually using WeChat Developer Tools or external ESLint
```

**No test framework or build scripts are configured in package.json**

## Key Files

- `project.config.json` - WeChat Mini Program configuration
- `app.json` - App pages, window settings, and worker configuration  
- `utils.js` - Core utility functions for camera and QR code handling
- `worker/index.js` - WebAssembly QR code processing worker
- `precheck.js` - QR code frame validation logic
- `upload.js` - Image upload and verification functions

## Dependencies

- `lottie-miniprogram` - Lottie animations support
- WebAssembly qrtool library (`qrtool.wx.js`) - QR code processing

## External APIs

- `https://themblem.com/api/v1/camera-rules/` - Device-specific camera settings
- `https://themblem.com/api/v1/check-auto-torch/` - Auto torch functionality
- `https://whatsmyip.themblem.com` - IP address detection
- `https://research.themblem.com/event/` - Event tracking endpoint