# CLAUDE.md

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

## Project Overview

**mdclient** is a Python library for interacting with Markdown note services (CodiMD, HedgeDoc, HackMD). The project is designed as a Python-first library with an optional CLI tool for quick operations.

**Key Design Principle:** Library-first architecture - all functionality is exposed through Python APIs (`MDAuth`, `MDClient` classes), with the CLI tool (`mdclient_cli.py`) being a thin wrapper that uses these APIs.

## Architecture

### Core Components

1. **`mdclient/`** - Main Python package
   - `MDAuth` class (`auth.py`) - Handles authentication and session management
   - `MDClient` class (`client.py`) - All note operations (CRUD + export/search)
   - `__init__.py` - Package entry point, exports `MDClient` and `MDAuth`

2. **`mdclient_cli.py`** - Optional CLI tool
   - Standalone script that imports and uses the mdclient package
   - Supports .env file integration for credentials
   - Not installed as a package command (run directly with `python3 mdclient_cli.py`)

### Session Management Pattern

The library uses a cookie-based session system:
- `MDAuth.login()` - Authenticates and saves cookies to a JSON file (`key.conf` by default)
- `MDClient._load_cookie()` - Automatically loads cookies for each request
- Cookies are stored in simple JSON format: `{"connect.sid": "...", "_csrf": "..."}`

### Multi-Endpoint Strategy

Both authentication and note operations attempt multiple API endpoints to handle different server implementations:
- Login: `/login`, `/auth/login`, `/api/login`, `/signin`
- Note retrieval: `/api/notes/{id}`, `/api/notes/{id}/content`, `/{id}/download`, `/{id}`
- Note listing: `/api/me/notes`, `/api/notes`, `/history`, `/me/notes`

This pattern is essential for compatibility across different Markdown note service implementations.

## Development Commands

```bash
# Install in development mode
pip install -e ".[dev]"

# Run tests
pytest

# Code formatting (line length: 100)
black mdclient/

# Type checking
mypy mdclient/

# Install with .env support
pip install -e ".[env]"
```

## Testing Authentication

When working on authentication-related features, test with:
```bash
# Test if current cookie is valid
python3 mdclient_cli.py test

# Login with credentials
python3 mdclient_cli.py login

# Or use Python directly
python3 -c "from mdclient import MDAuth; MDAuth().test_cookie()"
```

## Language and Localization

**Important:** All user-facing text and documentation must use Traditional Chinese (Taiwan) with natural, direct expression. Avoid translationese and mainland Chinese terminology.

Common term mappings:
- 登录 → 登入
- 服务器 → 伺服器
- 地址 → 位址
- 保存 → 儲存
- 文件 → 檔案
- 导入 → 匯入
- 导出 → 匯出
- 创建 → 建立
- 获取 → 取得
- 用户 → 使用者
- 邮箱 → 信箱
- 请求 → 請求
- 响应 → 回應

## Environment Variables

The library supports these environment variables (typically set in `.env` file):
- `MDCLIENT_URL` - Server URL
- `MDCLIENT_EMAIL` - Login email
- `MDCLIENT_PASSWORD` - Login password
- `MDCLIENT_COOKIE_FILE` - Cookie file path (default: `key.conf`)

## Key API Patterns

When adding new note operations or endpoints:

1. **Always try multiple endpoints** - Different services use different API patterns
2. **Handle both JSON and text responses** - Some endpoints return HTML/Markdown directly
3. **Return `None` on failure** - Consistent error handling pattern
4. **Print status messages** - Users expect feedback during operations
5. **Use Taiwan Traditional Chinese** - For all user-facing messages

## Common Patterns

### Adding a New Note Operation

```python
def new_operation(self, param: str) -> Optional[Dict]:
    """
    新操作的簡短描述

    Args:
        param: 參數說明

    Returns:
        操作結果，失敗時返回 None
    """
    print(f"正在執行操作: {param}")

    # 嘗試多個可能的端點
    endpoints = ['/api/endpoint1', '/api/endpoint2']

    for endpoint in endpoints:
        response = self._request('GET', endpoint)
        if response and response.status_code == 200:
            try:
                data = response.json()
                print("✓ 操作成功")
                return data
            except json.JSONDecodeError:
                # 處理非 JSON 回應
                pass

    print("✗ 操作失敗")
    return None
```

### CLI Command Pattern

CLI commands in `mdclient_cli.py` should:
1. Load .env file automatically
2. Support both command-line args and environment variables
3. Use `MDClient` and `MDAuth` classes (no direct HTTP requests)
4. Provide clear success/failure messages

## Package Structure

```
mdclient/
├── mdclient/           # Core library (Python package)
│   ├── __init__.py    # Exports MDClient, MDAuth
│   ├── auth.py        # Authentication logic
│   └── client.py      # Note operations API
├── mdclient_cli.py    # CLI tool (uses mdclient package)
├── pyproject.toml     # Package configuration
├── example.py         # Usage examples
└── .env.example       # Environment variable template
```

## Important Notes

- The library uses `requests` for HTTP operations with `timeout=10` on all requests
- Cookie files are stored as JSON in the current working directory
- The CLI tool is meant for quick operations, not programmatic use
- All methods print status messages to stdout for user feedback
- Error handling returns `None` rather than raising exceptions