# 配置管理 - 集中管理所有环境变量和敏感配置
import os
from functools import lru_cache
from typing import Optional


class Settings:
    """应用配置类"""
    
    def __init__(self):
        # 阿里云百炼AI (DASHSCOPE) API Key - 必须设置，无默认值
        self.DASHSCOPE_API_KEY: Optional[str] = os.getenv("DASHSCOPE_API_KEY")
        
        # 阿里云短信服务配置 - 必须设置，无默认值
        self.SMS_ACCESS_KEY_ID: Optional[str] = os.getenv("SMS_ACCESS_KEY_ID")
        self.SMS_ACCESS_KEY_SECRET: Optional[str] = os.getenv("SMS_ACCESS_KEY_SECRET")
        self.SMS_SIGN_NAME: str = os.getenv("SMS_SIGN_NAME", "甲辰藏品")
        self.SMS_TEMPLATE_CODE: str = os.getenv("SMS_TEMPLATE_CODE", "SMS_xxx")
        
        # 数据库配置 - 必须设置，无默认值
        self.DATABASE_URL: Optional[str] = os.getenv("DATABASE_URL")
        
        # JWT配置
        self.SECRET_KEY: str = os.getenv("SECRET_KEY")  # 必须设置，无默认值
        self.ALGORITHM: str = os.getenv("ALGORITHM", "HS256")
        self.ACCESS_TOKEN_EXPIRE_MINUTES: int = int(os.getenv("ACCESS_TOKEN_EXPIRE_MINUTES", "10080"))  # 7天
        
        # OSS配置 - 必须设置，无默认值
        self.OSS_ACCESS_KEY_ID: Optional[str] = os.getenv("OSS_ACCESS_KEY_ID")
        self.OSS_ACCESS_KEY_SECRET: Optional[str] = os.getenv("OSS_ACCESS_KEY_SECRET")
        self.OSS_BUCKET: str = os.getenv("OSS_BUCKET", "jiachenlong-oss")
        self.OSS_ENDPOINT: str = os.getenv("OSS_ENDPOINT", "oss-cn-hangzhou.aliyuncs.com")
        
        # Redis配置 (可选，用于限流和缓存)
        self.REDIS_URL: Optional[str] = os.getenv("REDIS_URL")
        
        # API Rate Limiting
        self.RATE_LIMIT_ENABLED: bool = os.getenv("RATE_LIMIT_ENABLED", "true").lower() == "true"
        self.RATE_LIMIT_SMS_PER_MINUTE: int = int(os.getenv("RATE_LIMIT_SMS_PER_MINUTE", "3"))
        self.RATE_LIMIT_OCR_PER_MINUTE: int = int(os.getenv("RATE_LIMIT_OCR_PER_MINUTE", "10"))
        self.RATE_LIMIT_BATCH_PER_MINUTE: int = int(os.getenv("RATE_LIMIT_BATCH_PER_MINUTE", "5"))
        self.RATE_LIMIT_API_PER_MINUTE: int = int(os.getenv("RATE_LIMIT_API_PER_MINUTE", "60"))
        
        # 管理员账号 - 必须设置，无默认值
        self.ADMIN_USERNAME: Optional[str] = os.getenv("ADMIN_USERNAME")
        self.ADMIN_PASSWORD: Optional[str] = os.getenv("ADMIN_PASSWORD")
    
    def get_dashscope_api_key(self) -> str:
        """获取阿里云百炼API Key"""
        if not self.DASHSCOPE_API_KEY:
            raise ValueError("DASHSCOPE_API_KEY 环境变量未设置")
        return self.DASHSCOPE_API_KEY
    
    def get_sms_config(self) -> dict:
        """获取短信配置"""
        return {
            "access_key_id": self.SMS_ACCESS_KEY_ID,
            "access_key_secret": self.SMS_ACCESS_KEY_SECRET,
            "sign_name": self.SMS_SIGN_NAME,
            "template_code": self.SMS_TEMPLATE_CODE,
        }


@lru_cache()
def get_settings() -> Settings:
    """获取单例配置实例"""
    return Settings()


# 导出便捷访问
settings = get_settings()