# config_loader.py - 读取config.toml的示例代码

import toml
import os
from pathlib import Path
from typing import Any, Dict, Optional

class ConfigLoader:
    """TOML配置文件加载器"""
    
    def __init__(self, config_path: Optional[str] = None):
        """
        初始化配置加载器
        
        Args:
            config_path: 配置文件路径，如果为None则自动查找
        """
        if config_path is None:
            # 自动查找配置文件
            config_path = self._find_config_file()
        
        self.config_path = Path(config_path)
        self._config: Dict[str, Any] = {}
        self.load()
    
    def _find_config_file(self) -> str:
        """自动查找配置文件"""
        possible_paths = [
            "config.toml",
            "config/config.toml",
            "~/.config/myapp/config.toml",
            "/etc/myapp/config.toml"
        ]
        
        for path in possible_paths:
            expanded_path = os.path.expanduser(path)
            if os.path.exists(expanded_path):
                return expanded_path
        
        raise FileNotFoundError("未找到配置文件")
    
    def load(self) -> None:
        """加载配置文件"""
        if not self.config_path.exists():
            raise FileNotFoundError(f"配置文件不存在: {self.config_path}")
        
        with open(self.config_path, 'r', encoding='utf-8') as f:
            self._config = toml.load(f)
    
    def get(self, key: str, default: Any = None) -> Any:
        """获取配置值，支持点号分隔的路径"""
        keys = key.split('.')
        value = self._config
        
        try:
            for k in keys:
                value = value[k]
            return value
        except (KeyError, TypeError):
            return default
    
    def get_section(self, section: str) -> Dict[str, Any]:
        """获取整个配置节"""
        return self._config.get(section, {})
    
    def reload(self) -> None:
        """重新加载配置文件"""
        self.load()
    
    def __getitem__(self, key: str) -> Any:
        """支持字典式访问"""
        return self.get(key)
    
    def __contains__(self, key: str) -> bool:
        """检查配置是否存在"""
        return self.get(key) is not None
    
    @property
    def all(self) -> Dict[str, Any]:
        """获取所有配置"""
        return self._config