"""
配置加载模块

负责读取和解析 config.toml 配置文件，提供全局配置对象。
支持从环境变量覆盖敏感配置。
"""
from pathlib import Path

import tomllib
from pydantic import ValidationError
from .config_models import ConfigModel, NapCatWSModel, BotModel, RedisModel, DockerModel, ImageManagerModel, MySQLModel, ReverseWSModel, ThreadingModel, BilibiliModel, LocalFileServerModel, DiscordModel, CrossPlatformModel, LoggingModel
from .utils.logger import ModuleLogger
from .utils.exceptions import ConfigError, ConfigNotFoundError, ConfigValidationError
from .utils.env_loader import env_loader


class Config:
    """
    配置加载类，负责读取和解析 config.toml 文件
    支持从环境变量覆盖敏感配置
    """

    def __init__(self, file_path: str = "config.toml"):
        """
        初始化配置加载器

        :param file_path: 配置文件路径，默认为 "config.toml"
        """
        self.path = Path(file_path)
        self._model: ConfigModel
        # 创建模块专用日志记录器
        self.logger = ModuleLogger("ConfigLoader")
        # 加载环境变量
        env_loader.load()
        self.load()

    def load(self):
        """
        加载并验证配置文件

        :raises ConfigNotFoundError: 如果配置文件不存在
        :raises ConfigValidationError: 如果配置格式不正确
        :raises ConfigError: 如果加载配置时发生其他错误
        """
        # 检查配置文件权限
        self._check_file_permissions()
        
        if not self.path.exists():
            self.logger.warning(f"配置文件 {self.path} 未找到，正在生成示例配置...")
            self._generate_example_config()
            self.logger.success(f"示例配置已生成: {self.path}")
            self.logger.info("请编辑配置文件后重新启动程序")

        try:
            self.logger.info(f"正在从 {self.path} 加载配置...")
            with open(self.path, "rb") as f:
                raw_config = tomllib.load(f)
            
            # 从环境变量覆盖敏感配置
            raw_config = self._override_with_env_vars(raw_config)
            
            self._model = ConfigModel(**raw_config)
            self.logger.success("配置加载并验证成功！")

        except ValidationError as e:
            error_details = []
            for error in e.errors():
                field = " -> ".join(map(str, error["loc"]))
                error_msg = f"字段 '{field}': {error['msg']}"
                error_details.append(error_msg)
                
            validation_error = ConfigValidationError(
                message="配置验证失败"
            )
            validation_error.original_error = e
            
            self.logger.error("配置验证失败，请检查 `config.toml` 文件中的以下错误：")
            for detail in error_details:
                self.logger.error(f"  - {detail}")
            
            self.logger.log_custom_exception(validation_error)
            raise validation_error
        except tomllib.TOMLDecodeError as e:
            error = ConfigError(
                message=f"TOML解析错误: {str(e)}"
            )
            error.original_error = e
            self.logger.error(f"加载配置文件时发生TOML解析错误: {error.message}")
            self.logger.log_custom_exception(error)
            raise error
        except Exception as e:
            error = ConfigError(
                message=f"加载配置文件时发生未知错误: {str(e)}"
            )
            error.original_error = e
            self.logger.exception(f"加载配置文件时发生未知错误: {error.message}")
            self.logger.log_custom_exception(error)
            raise error

    def _check_file_permissions(self):
        """
        检查配置文件权限
        
        确保配置文件不会被其他用户读取，保护敏感信息。
        """
        if not self.path.exists():
            return
            
        try:
            import os
            import stat
            
            # 获取文件状态
            file_stat = self.path.stat()
            
            # 检查文件权限
            mode = file_stat.st_mode
            
            # 检查是否其他用户可读
            if mode & stat.S_IROTH:
                self.logger.warning(f"配置文件 {self.path} 其他用户可读，存在安全风险")
                self.logger.info("建议使用命令: chmod 600 config.toml")
            
            # 检查是否其他用户可写
            if mode & stat.S_IWOTH:
                self.logger.error(f"配置文件 {self.path} 其他用户可写，存在严重安全风险！")
                self.logger.error("请立即修复权限: chmod 600 config.toml")
                
        except Exception as e:
            self.logger.warning(f"检查文件权限失败: {e}")

    def _override_with_env_vars(self, raw_config: dict) -> dict:
        """
        使用环境变量覆盖敏感配置
        
        Args:
            raw_config: 原始配置字典
            
        Returns:
            更新后的配置字典
        """
        # MySQL 配置
        if 'mysql' in raw_config:
            mysql_config = raw_config['mysql']
            mysql_config['host'] = env_loader.get('MYSQL_HOST', mysql_config.get('host', 'localhost'))
            mysql_config['port'] = env_loader.get_int('MYSQL_PORT', mysql_config.get('port', 3306))
            mysql_config['user'] = env_loader.get('MYSQL_USER', mysql_config.get('user', 'root'))
            mysql_config['password'] = env_loader.get('MYSQL_PASSWORD', mysql_config.get('password', ''))
            mysql_config['db'] = env_loader.get('MYSQL_DB', mysql_config.get('db', 'neobot'))
        
        # Redis 配置
        if 'redis' in raw_config:
            redis_config = raw_config['redis']
            redis_config['host'] = env_loader.get('REDIS_HOST', redis_config.get('host', 'localhost'))
            redis_config['port'] = env_loader.get_int('REDIS_PORT', redis_config.get('port', 6379))
            redis_config['db'] = env_loader.get_int('REDIS_DB', redis_config.get('db', 0))
            redis_config['password'] = env_loader.get('REDIS_PASSWORD', redis_config.get('password', ''))
        
        # NapCat WebSocket 配置
        if 'napcat_ws' in raw_config:
            ws_config = raw_config['napcat_ws']
            ws_config['uri'] = env_loader.get('NAPCAT_WS_URI', ws_config.get('uri', 'ws://localhost:8080'))
            ws_config['token'] = env_loader.get('NAPCAT_WS_TOKEN', ws_config.get('token', ''))
        
        # Discord 配置
        if 'discord' in raw_config:
            discord_config = raw_config['discord']
            discord_config['token'] = env_loader.get('DISCORD_TOKEN', discord_config.get('token', ''))
            discord_config['proxy'] = env_loader.get('DISCORD_PROXY', discord_config.get('proxy'))
        
        # Bilibili 配置
        if 'bilibili' in raw_config:
            bili_config = raw_config['bilibili']
            bili_config['sessdata'] = env_loader.get('BILIBILI_SESSDATA', bili_config.get('sessdata'))
            bili_config['bili_jct'] = env_loader.get('BILIBILI_BILI_JCT', bili_config.get('bili_jct'))
            bili_config['buvid3'] = env_loader.get('BILIBILI_BUVID3', bili_config.get('buvid3'))
            bili_config['dedeuserid'] = env_loader.get('BILIBILI_DEDEUSERID', bili_config.get('dedeuserid'))
        
        # Docker 配置
        if 'docker' in raw_config:
            docker_config = raw_config['docker']
            docker_config['base_url'] = env_loader.get('DOCKER_BASE_URL', docker_config.get('base_url'))
            docker_config['tls_verify'] = env_loader.get_bool('DOCKER_TLS_VERIFY', docker_config.get('tls_verify', False))
        
        # 反向 WebSocket 配置
        if 'reverse_ws' in raw_config:
            reverse_config = raw_config['reverse_ws']
            reverse_config['enabled'] = env_loader.get_bool('REVERSE_WS_ENABLED', reverse_config.get('enabled', False))
            reverse_config['host'] = env_loader.get('REVERSE_WS_HOST', reverse_config.get('host', '0.0.0.0'))
            reverse_config['port'] = env_loader.get_int('REVERSE_WS_PORT', reverse_config.get('port', 3002))
            reverse_config['token'] = env_loader.get('REVERSE_WS_TOKEN', reverse_config.get('token'))
        
        # 本地文件服务器配置
        if 'local_file_server' in raw_config:
            server_config = raw_config['local_file_server']
            server_config['enabled'] = env_loader.get_bool('LOCAL_FILE_SERVER_ENABLED', server_config.get('enabled', True))
            server_config['host'] = env_loader.get('LOCAL_FILE_SERVER_HOST', server_config.get('host', '0.0.0.0'))
            server_config['port'] = env_loader.get_int('LOCAL_FILE_SERVER_PORT', server_config.get('port', 3003))
        
        # 日志配置
        if 'logging' in raw_config:
            log_config = raw_config['logging']
            log_config['level'] = env_loader.get('LOG_LEVEL', log_config.get('level', 'DEBUG'))
            log_config['file_level'] = env_loader.get('LOG_FILE_LEVEL', log_config.get('file_level', 'DEBUG'))
            log_config['console_level'] = env_loader.get('LOG_CONSOLE_LEVEL', log_config.get('console_level', 'INFO'))
        
        return raw_config

    def _generate_example_config(self):
        """
        生成示例配置文件
        """
        example_path = Path("config.example.toml")
        
        if not example_path.exists():
            self.logger.error(f"示例配置文件 {example_path} 不存在，无法生成配置")
            raise ConfigNotFoundError(message=f"示例配置文件 {example_path} 不存在")
        
        content = example_path.read_text(encoding='utf-8')
        self.path.write_text(content, encoding='utf-8')

    # 通过属性访问配置
    @property
    def napcat_ws(self) -> NapCatWSModel:
        """
        获取 NapCat WebSocket 配置
        """
        return self._model.napcat_ws

    @property
    def bot(self) -> BotModel:
        """
        获取 Bot 基础配置
        """
        return self._model.bot

    @property
    def redis(self) -> RedisModel:
        """
        获取 Redis 配置
        """
        return self._model.redis
    
    @property
    def mysql(self) -> MySQLModel:
        """
        获取 MySQL 配置
        """
        return self._model.mysql

    @property
    def docker(self) -> DockerModel:
        """
        获取 Docker 配置
        """
        return self._model.docker
    
    @property
    def image_manager(self) -> ImageManagerModel:
        """
        获取图片生成管理器配置
        """
        return self._model.image_manager

    @property
    def reverse_ws(self) -> ReverseWSModel:
        """
        获取反向 WebSocket 配置
        """
        return self._model.reverse_ws
    
    @property
    def threading(self) -> ThreadingModel:
        """
        获取线程管理配置
        """
        return self._model.threading
    
    @property
    def bilibili(self) -> BilibiliModel:
        """
        获取 Bilibili 配置
        """
        return self._model.bilibili
    
    @property
    def local_file_server(self) -> LocalFileServerModel:
        """
        获取本地文件服务器配置
        """
        return self._model.local_file_server

    @property
    def discord(self) -> DiscordModel:
        """
        获取 Discord 配置
        """
        return self._model.discord
    
    @property
    def cross_platform(self) -> CrossPlatformModel:
        """
        获取跨平台配置
        """
        return self._model.cross_platform
    
    @property
    def logging(self) -> LoggingModel:
        """
        获取日志配置
        """
        return self._model.logging


# 实例化全局配置对象
global_config = Config()