from pathlib import Path
from typing import Optional, Tuple, Type

from pydantic_settings import (
    BaseSettings,
    PydanticBaseSettingsSource,
    SettingsConfigDict,
    TomlConfigSettingsSource,
)

class Settings(BaseSettings):
    """Application settings."""
    
    # 应用配置
    APP_NAME: str
    DEBUG: bool
    SECRET_KEY: str
    
    # 路径配置
    BASE_DIR: Path = Path(__file__).parent.parent.parent
    
    model_config = SettingsConfigDict(toml_file=BASE_DIR / "config.toml")
    
    @classmethod
    def settings_customise_sources(
            cls,
            settings_cls: Type[BaseSettings],
            init_settings: PydanticBaseSettingsSource,
            env_settings: PydanticBaseSettingsSource,
            dotenv_settings: PydanticBaseSettingsSource,
            file_secret_settings: PydanticBaseSettingsSource,
    ) -> Tuple[PydanticBaseSettingsSource, ...]:
        return (TomlConfigSettingsSource(settings_cls),)


# 创建全局设置实例
config = Settings()