# CLAUDE.md

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

## Project Overview

This is the **GFast UI** project (`gfast-ui`), a Vue 3 admin management system based on the vue-next-admin template, customized for a digital advertising/trading platform.

## Commands

- `npm install` - Install dependencies (use `npm install --registry=https://registry.npmmirror.com` for China mainland)
- `npm run dev` - Start development server
- `npm run build` - Build for production
- `npm run lint` - Run ESLint check
- `npm run lint-fix` - Fix ESLint issues automatically
- `npm run type-check` - Run TypeScript type checking
- `npm run quality` - Run both lint and type-check

## Architecture Overview

**Tech Stack:**
- Vue 3 with Composition API (script setup)
- TypeScript
- Vite
- Element Plus (UI framework)
- Pinia (state management)
- Vue Router (with hash mode)
- Axios (HTTP client)
- i18n (internationalization)
- mitt (event bus)

**Directory Structure:**
- `src/api/` - API client methods organized by business domain (ads, assets, cid, customerService, digitalHuman, knowledge, login, menu, settings, system, etc.)
- `src/components/` - Reusable Vue components
- `src/directives/` - Custom Vue directives
- `src/i18n/` - Internationalization configuration
- `src/layout/` - Main layout components
- `src/router/` - Route configuration
  - `index.ts` - Router setup and guard
  - `backEnd.ts` - Backend-controlled route initialization
  - `frontEnd.ts` - Frontend-controlled route initialization
  - `route.ts` - Static route definitions
- `src/stores/` - Pinia state stores
  - `themeConfig.ts` - Theme and global configuration
  - `userInfo.ts` - User information
  - `routesList.ts` - Dynamic route management
  - `keepAliveNames.ts` - keep-alive cache management
- `src/theme/` - Theme related styles
- `src/types/` - TypeScript type definitions
- `src/utils/` - Utility functions
  - `request.ts` - Axios instance with interceptors, error handling, and token management
  - `storage.ts` - Session storage wrapper
  - `gfast.ts` - GFast-specific helpers (file URL construction, tree building, date formatting)
  - `diffUtils.ts` - Field change detection for PUT requests
- `src/views/` - Page components organized by business module

**Key Patterns:**

1. **Routing**: Supports both frontend and backend controlled routing. When backend control is enabled (`isRequestRoutes: true` in themeConfig), routes are fetched from the backend and dynamically added.

2. **API Requests**:
   - API methods are organized by domain in `src/api/` (each subdomain has its own directory structure)
   - The Axios instance in `src/utils/request.ts` is pre-configured with:
     - 50 second request timeout
     - `qs` serialization of query parameters with dot notation for nested objects
     - Automatically adds Bearer token (from cookies via Session utility) to all requests
     - Automatically sends only changed fields for PUT requests (diff comparison with original data via `_originalData` field)
     - Handles token expiration globally with redirect to login (prevents multiple overlapping popups)
     - Provides error message extraction from multiple response formats (`message`, `msg`, `error`, `detail`)
     - Error throttling: maximum one error message every 2 seconds
     - Supports error mode configuration via `requestOptions.errorMode`:
       - `global`: (default) Global error popup with backend message
       - `page`: No automatic popup, reject the error for page-level handling
       - `silent`: Completely silent, no error display
     - Special handling for `code === 402`: Triggers module not enabled subscription flow (except for specific asset endpoints)
   - Response format expects `code`, `message`/`msg`, and data. Known success codes: `0`, `200`.
   - Use `getApiErrorMessage(error)` from `/@/utils/request` to extract user-friendly error messages in catch blocks when using `page` or `silent` mode.

3. **Global Properties & Components**:
   - Helpers registered globally for template use:
     - `getUpFileUrl`, `handleTree`, `useDict`, `selectDictLabel`, `parseTime`, `getItems`, `setItems`, `getOptionValue`, `isEmpty`
   - Global components:
     - `pagination` - Reusable pagination component
   - Global plugins registered:
     - `vue-simple-uploader` - Large file upload component
   - Global event bus via mitt: `app.config.globalProperties.mittBus`

4. **Authentication**:
   - Token is stored in cookies via `js-cookie` (through the `Session` utility). Other user session data is stored in `sessionStorage`.
   - The `Session.clearAuth()` method only clears authentication-related keys (`token`, `userInfo`, `userMenu`, `permissions`), preserving other local preferences.
   - 401 responses (HTTP or business code) containing token expiration signals trigger automatic logout with a single confirmation popup.

5. **Keep-alive**: Route components can be cached via keep-alive, managed by the `useKeepALiveNames` store.

## Environment Variables

- `.env.development` - Development environment settings
- `.env.production` - Production environment settings
- `VITE_API_URL` - Backend API base URL
- `VITE_PORT` - Dev server port
- `VITE_PUBLIC_PATH` - Public base path for production build
- `VITE_OPEN_CDN` - Enable CDN for external dependencies

## Development Notes

- The project uses `/@` alias for `src/`
- Components use the Composition API with `<script setup lang="ts">`
- Styling is done with SCSS
- ESLint enforces code quality
- Node version requirement: `>=16.0.0` (supported: v16.x ~ v20.x)