"""配置加载"""

import json
import os
from typing import Any, cast
from pathlib import Path
from src.utils.logger import get_logger
from .types import AppConfig

# 初始化日志
logger = get_logger(__name__)

CONFIG_FILE = str(Path(__file__).parent.parent.parent / "config" / "config.json")


def merge_default_config_file() -> bool:
    """把新版本默认配置项补进现有 config.json，保留用户已有配置值。"""
    default_dict = AppConfig().model_dump()
    path = Path(CONFIG_FILE)
    changed = False

    try:
        if path.exists():
            with open(path, 'r', encoding='utf-8') as f:
                current = json.load(f)
            if not isinstance(current, dict):
                current = {}
        else:
            current = {}

        for key, value in default_dict.items():
            if key not in current:
                current[key] = value
                changed = True

        if changed or not path.exists():
            path.parent.mkdir(parents=True, exist_ok=True)
            tmp = path.with_suffix(path.suffix + ".tmp")
            with open(tmp, 'w', encoding='utf-8') as f:
                json.dump(current, f, ensure_ascii=False, indent=2)
            os.replace(tmp, path)
            logger.info("配置文件已合并新版本默认项", extra={"config_file": CONFIG_FILE})
        return changed
    except Exception as e:
        logger.warning(f"合并配置默认项失败: {e}")
        return False

def load_config() -> dict[str, Any]:
    """加载配置文件"""
    default_config = AppConfig()
    
    if not os.path.exists(CONFIG_FILE):
        logger.info("配置文件不存在，使用默认配置", extra={
            "config_file": CONFIG_FILE
        })
        return default_config.model_dump()
        
    try:
        with open(CONFIG_FILE, 'r', encoding='utf-8') as f:
            file_config = json.load(f)
            
            # 将默认配置转为字典
            config_dict = default_config.model_dump()
            
            # 更新其他配置
            config_dict.update(file_config)
            
            # 重新验证并创建模型实例
            final_config = AppConfig(**config_dict)
            final_dict = final_config.model_dump()
            
            # 只有在没有请求上下文时（即启动时）打印加载日志
            from src.utils.logger import get_request_id
            if not get_request_id():
                logger.info("配置文件加载成功", extra={
                    "config_file": CONFIG_FILE,
                    "port_api": final_dict.get("port_api"),
                    "debug_mode": final_dict.get("debug")
                })
            return final_dict
            
    except Exception as e:
        logger.error(f"配置文件加载失败，使用默认配置", extra={
            "config_file": CONFIG_FILE,
            "error": str(e)
        })
        return default_config.model_dump()