import os
from pathlib import Path
from typing import Literal
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    """应用配置，从环境变量加载."""

    # 安全配置
    encrypt_key: str  # AES-256 密钥 (base64)
    api_token: str    # API 认证 Token

    # 路径配置
    data_dir: Path = Path('./data')

    # 服务器配置
    host: str = '0.0.0.0'
    port: int = 8000

    model_config = SettingsConfigDict(
        env_prefix='GM_',
        env_file='.env',
        env_file_encoding='utf-8',
    )

    @property
    def db_path(self) -> Path:
        """SQLite 数据库路径."""
        return self.data_dir / 'git_manager.db'

    @property
    def ssh_keys_dir(self) -> Path:
        """SSH 密钥存储目录."""
        return self.data_dir / 'ssh_keys'

    @property
    def repos_dir(self) -> Path:
        """仓库镜像存储目录."""
        return self.data_dir / 'repos'


settings = Settings()