"""
配置管理模块
支持多配置项、默认值回退、自动保存
"""
import json
import os
import logging

logger = logging.getLogger(__name__)

CONFIG_FILE = "config.json"
OUTPUT_DIR = "xhs_workspace"

DEFAULT_CONFIG = {
    "api_key": "",
    "base_url": "https://api.openai.com/v1",
    "sd_url": "http://127.0.0.1:7860",
    "mcp_url": "http://localhost:18060/mcp",
    "model": "gpt-3.5-turbo",
    "persona": "温柔知性的时尚博主",
    "auto_reply_enabled": False,
    "schedule_enabled": False,
}


class ConfigManager:
    """配置管理器 - 单例模式"""

    _instance = None
    _config = None

    def __new__(cls):
        if cls._instance is None:
            cls._instance = super().__new__(cls)
        return cls._instance

    def __init__(self):
        if self._config is None:
            self._config = self._load()

    def _load(self) -> dict:
        """从文件加载配置，缺失项用默认值填充"""
        config = DEFAULT_CONFIG.copy()
        if os.path.exists(CONFIG_FILE):
            try:
                with open(CONFIG_FILE, "r", encoding="utf-8") as f:
                    saved = json.load(f)
                config.update(saved)
            except (json.JSONDecodeError, IOError) as e:
                logger.warning("配置文件读取失败，使用默认值: %s", e)
        return config

    def save(self):
        """保存配置到文件"""
        try:
            with open(CONFIG_FILE, "w", encoding="utf-8") as f:
                json.dump(self._config, f, indent=4, ensure_ascii=False)
        except IOError as e:
            logger.error("配置保存失败: %s", e)

    def get(self, key: str, default=None):
        """获取配置项"""
        return self._config.get(key, default)

    def set(self, key: str, value):
        """设置配置项并自动保存"""
        self._config[key] = value
        self.save()

    def update(self, data: dict):
        """批量更新配置"""
        self._config.update(data)
        self.save()

    @property
    def all(self) -> dict:
        """返回全部配置（副本）"""
        return self._config.copy()

    def ensure_workspace(self):
        """确保工作空间目录存在"""
        os.makedirs(OUTPUT_DIR, exist_ok=True)