#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
统一配置管理模块
从环境变量加载所有配置，提供统一的配置接口
"""

import os
import logging
from typing import Dict, Any, Optional
from dataclasses import dataclass, asdict
from dotenv import load_dotenv

# 在模块加载时，自动从.env文件加载环境变量
# 这使得所有后续的os.getenv调用都能获取到.env中定义的值
load_dotenv()

logger = logging.getLogger(__name__)

# --- 数据类定义 ---
# 这些类定义了配置的结构，但不包含敏感的默认值。
# 默认值只用于那些不敏感或在大多数环境中都相同的值。

@dataclass
class DatabaseConfig:
    """数据库配置"""
    url: str
    pool_size: int = 10
    max_overflow: int = 20
    pool_timeout: int = 30
    pool_recycle: int = 600  # 改为 10 分钟回收连接，避免连接超时

@dataclass
class LLMConfig:
    """LLM配置"""
    provider: str
    api_key: str
    model: str
    base_url: Optional[str] = None
    temperature: float = 0.7
    max_tokens: int = 2000
    timeout: int = 30

@dataclass
class ServerConfig:
    """服务器配置"""
    host: str = "0.0.0.0"
    port: int = 5000
    websocket_port: int = 8765
    debug: bool = False
    log_level: str = "INFO"

@dataclass
class FeishuConfig:
    """飞书配置"""
    app_id: Optional[str] = None
    app_secret: Optional[str] = None
    app_token: Optional[str] = None
    verification_token: Optional[str] = None
    encrypt_key: Optional[str] = None
    table_id: Optional[str] = None


@dataclass
class AIAccuracyConfig:
    """AI准确率配置"""
    auto_approve_threshold: float = 0.95
    use_human_resolution_threshold: float = 0.90
    manual_review_threshold: float = 0.80
    ai_suggestion_confidence: float = 0.95
    human_resolution_confidence: float = 0.90


# --- 统一配置管理器 ---

class UnifiedConfig:
    """
    统一配置管理器
    在实例化时，从环境变量中加载所有配置。
    """

    def __init__(self):
        logger.info("Initializing unified configuration from environment variables...")
        self.database = self._load_database_from_env()
        self.llm = self._load_llm_from_env()
        self.server = self._load_server_from_env()
        self.feishu = self._load_feishu_from_env()
        self.ai_accuracy = self._load_ai_accuracy_from_env()
        self.validate_config()

    def _load_database_from_env(self) -> DatabaseConfig:
        db_url = os.getenv("DATABASE_URL")
        if not db_url:
            raise ValueError("FATAL: DATABASE_URL environment variable is not set.")
        logger.info("Database config loaded.")
        return DatabaseConfig(url=db_url)

    def _load_llm_from_env(self) -> LLMConfig:
        api_key = os.getenv("LLM_API_KEY")
        if not api_key:
            logger.warning("LLM_API_KEY is not set. LLM functionality will be disabled or fail.")

        config = LLMConfig(
            provider=os.getenv("LLM_PROVIDER", "qwen"),
            api_key=api_key,
            model=os.getenv("LLM_MODEL", "qwen-plus-latest"),
            base_url=os.getenv("LLM_BASE_URL"),
            temperature=float(os.getenv("LLM_TEMPERATURE", 0.7)),
            max_tokens=int(os.getenv("LLM_MAX_TOKENS", 2000)),
            timeout=int(os.getenv("LLM_TIMEOUT", 30))
        )
        logger.info("LLM config loaded.")
        return config

    def _load_server_from_env(self) -> ServerConfig:
        config = ServerConfig(
            host=os.getenv("SERVER_HOST", "0.0.0.0"),
            port=int(os.getenv("SERVER_PORT", 5000)),
            websocket_port=int(os.getenv("WEBSOCKET_PORT", 8765)),
            debug=os.getenv("DEBUG_MODE", "False").lower() in ('true', '1', 't'),
            log_level=os.getenv("LOG_LEVEL", "INFO").upper()
        )
        logger.info("Server config loaded.")
        return config

    def _load_feishu_from_env(self) -> FeishuConfig:
        config = FeishuConfig(
            app_id=os.getenv("FEISHU_APP_ID"),
            app_secret=os.getenv("FEISHU_APP_SECRET"),
            app_token=os.getenv("FEISHU_APP_TOKEN"),
            verification_token=os.getenv("FEISHU_VERIFICATION_TOKEN"),
            encrypt_key=os.getenv("FEISHU_ENCRYPT_KEY"),
            table_id=os.getenv("FEISHU_TABLE_ID")
        )
        logger.info("Feishu config loaded.")
        return config

    def _load_ai_accuracy_from_env(self) -> AIAccuracyConfig:
        config = AIAccuracyConfig(
            auto_approve_threshold=float(os.getenv("AI_AUTO_APPROVE_THRESHOLD", 0.95)),
            use_human_resolution_threshold=float(os.getenv("AI_USE_HUMAN_RESOLUTION_THRESHOLD", 0.90)),
            manual_review_threshold=float(os.getenv("AI_MANUAL_REVIEW_THRESHOLD", 0.80)),
            ai_suggestion_confidence=float(os.getenv("AI_SUGGESTION_CONFIDENCE", 0.95)),
            human_resolution_confidence=float(os.getenv("AI_HUMAN_RESOLUTION_CONFIDENCE", 0.90))
        )
        logger.info("AI Accuracy config loaded.")
        return config

    def validate_config(self):
        """在启动时验证关键配置"""
        if not self.database.url:
            raise ValueError("Database URL is missing.")
        if not self.llm.api_key:
            logger.warning("LLM API key is not configured. AI features may fail.")
        if self.feishu.app_id and not self.feishu.app_secret:
            logger.warning("FEISHU_APP_ID is set, but FEISHU_APP_SECRET is missing.")
        logger.info("Configuration validation passed (warnings may exist).")

    # --- Public Getters ---

    def get_all_config(self) -> Dict[str, Any]:
        """获取所有配置的字典表示"""
        return {
            'database': asdict(self.database),
            'llm': asdict(self.llm),
            'server': asdict(self.server),
            'feishu': asdict(self.feishu),
            'ai_accuracy': asdict(self.ai_accuracy),
        }

# --- 全局单例模式 ---

_config_instance: Optional[UnifiedConfig] = None

def get_config() -> UnifiedConfig:
    """
    获取全局统一配置实例。
    第一次调用时，它会创建并加载配置。后续调用将返回缓存的实例。
    """
    global _config_instance
    if _config_instance is None:
        _config_instance = UnifiedConfig()
    return _config_instance

def reload_config() -> UnifiedConfig:
    """强制重新加载配置"""
    global _config_instance
    # 强制重新读取 .env 文件并覆盖当前环境变量
    load_dotenv(override=True)
    _config_instance = None
    return get_config()