import os
from functools import lru_cache
from typing import Optional
from pydantic import BaseModel
from dotenv import load_dotenv

# 加载环境变量（如果直接从main导入，这里可能是冗余的，但为了安全起见）
load_dotenv()

class Settings(BaseModel):
    """应用程序配置类"""
    # DashScope配置
    dashscope_api_key: str = os.getenv("DASHSCOPE_API_KEY", "sk-caa199589f1c451aaac471fad2986e28")
    
    # 服务器配置
    host: str = os.getenv("HOST", "0.0.0.0")
    port: int = int(os.getenv("PORT", "9001"))
    debug: bool = os.getenv("DEBUG", "False").lower() in ["true", "1", "t", "yes"]
    
    # 腾讯云配置
    qcloud_secret_id: str = os.getenv("QCLOUD_SECRET_ID", "")
    qcloud_secret_key: str = os.getenv("QCLOUD_SECRET_KEY", "")
    qcloud_cos_region: str = os.getenv("QCLOUD_COS_REGION", "ap-guangzhou")
    qcloud_cos_bucket: str = os.getenv("QCLOUD_COS_BUCKET", "")
    qcloud_cos_domain: str = os.getenv("QCLOUD_COS_DOMAIN", "")
    
    # 数据库配置
    db_host: str = os.getenv("DB_HOST", "localhost")
    db_port: int = int(os.getenv("DB_PORT", "3306"))
    db_user: str = os.getenv("DB_USER", "root")
    db_password: str = os.getenv("DB_PASSWORD", "password")
    db_name: str = os.getenv("DB_NAME", "ai_dressing")
    
    # 数据库URL
    @property
    def database_url(self) -> str:
        """
        构建SQLAlchemy数据库连接URL
        
        Returns:
            str: 数据库连接URL
        """
        return f"mysql+pymysql://{self.db_user}:{self.db_password}@{self.db_host}:{self.db_port}/{self.db_name}"
    
    # 其他配置可以根据需要添加
    log_level: str = os.getenv("LOG_LEVEL", "INFO")

@lru_cache()
def get_settings() -> Settings:
    """
    获取应用程序配置
    使用lru_cache装饰器避免重复读取环境变量，提高性能
    
    Returns:
        Settings: 配置对象
    """
    return Settings()

def validate_api_key():
    """
    验证API密钥是否已配置
    
    Raises:
        ValueError: 如果API密钥未配置
    """
    settings = get_settings()
    if not settings.dashscope_api_key:
        raise ValueError("DASHSCOPE_API_KEY未设置，请在.env文件中配置")
    return True

def validate_qcloud_config():
    """
    验证腾讯云配置是否已设置
    
    Raises:
        ValueError: 如果腾讯云配置未正确设置
    """
    settings = get_settings()
    if not settings.qcloud_secret_id or not settings.qcloud_secret_key:
        raise ValueError("腾讯云SecretId和SecretKey未设置，请在.env文件中配置")
    if not settings.qcloud_cos_bucket:
        raise ValueError("腾讯云COS存储桶名称未设置，请在.env文件中配置")
    return True