"""
应用配置管理
"""
import os
from typing import Optional
from pydantic_settings import BaseSettings
from functools import lru_cache


class Settings(BaseSettings):
    """应用配置"""
    
    # 应用基础配置
    APP_NAME: str = "Finyx Data AI API"
    APP_VERSION: str = "1.0.0"
    DEBUG: bool = os.getenv("DEBUG", "False").lower() == "true"
    API_V1_PREFIX: str = "/api/v1"
    
    # 服务器配置
    HOST: str = os.getenv("HOST", "0.0.0.0")
    PORT: int = int(os.getenv("PORT", 8000))
    
    # CORS 配置
    CORS_ORIGINS: list = [
        "http://localhost:3000",
        "http://localhost:8080",
        "http://127.0.0.1:3000",
    ]
    
    # 大模型 API 配置
    # 通义千问
    DASHSCOPE_API_KEY: Optional[str] = os.getenv("DASHSCOPE_API_KEY")
    DASHSCOPE_BASE_URL: str = "https://dashscope.aliyuncs.com/api/v1/services/aigc/text-generation/generation"
    QWEN_MODEL: str = os.getenv("QWEN_MODEL", "qwen-max")
    
    # OpenAI
    OPENAI_API_KEY: Optional[str] = os.getenv("OPENAI_API_KEY")
    OPENAI_BASE_URL: str = "https://api.openai.com/v1/chat/completions"
    OPENAI_MODEL: str = os.getenv("OPENAI_MODEL", "gpt-4")
    
    # 文心一言
    QIANFAN_ACCESS_KEY: Optional[str] = os.getenv("QIANFAN_ACCESS_KEY")
    QIANFAN_SECRET_KEY: Optional[str] = os.getenv("QIANFAN_SECRET_KEY")
    
    # 硅基流动 (SiliconFlow)
    SILICONFLOW_API_KEY: Optional[str] = os.getenv("SILICONFLOW_API_KEY")
    SILICONFLOW_BASE_URL: str = os.getenv(
        "SILICONFLOW_BASE_URL",
        "https://api.siliconflow.cn/v1/chat/completions"
    )
    SILICONFLOW_MODEL: str = os.getenv("SILICONFLOW_MODEL", "deepseek-chat")
    
    # 视觉大模型配置（用于场景优化接口的图片识别）
    VISION_MODEL: Optional[str] = os.getenv("VISION_MODEL")
    VISION_MODEL_BASE_URL: str = os.getenv(
        "VISION_MODEL_BASE_URL",
        "https://api.siliconflow.cn/v1/chat/completions"
    )
    
    # 大模型默认配置
    DEFAULT_LLM_MODEL: str = os.getenv("DEFAULT_LLM_MODEL", "qwen-max")
    DEFAULT_TEMPERATURE: float = float(os.getenv("DEFAULT_TEMPERATURE", "0.3"))
    LLM_TIMEOUT: int = int(os.getenv("LLM_TIMEOUT", "60"))
    LLM_MAX_RETRIES: int = int(os.getenv("LLM_MAX_RETRIES", "3"))
    
    # 文件上传配置
    UPLOAD_DIR: str = os.getenv("UPLOAD_DIR", "uploads/temp")
    MAX_UPLOAD_SIZE: int = int(os.getenv("MAX_UPLOAD_SIZE", 52428800))  # 50MB
    ALLOWED_FILE_EXTENSIONS: list = [".xlsx", ".xls", ".doc", ".docx", ".pdf", ".csv"]
    
    @property
    def allowed_extensions(self) -> list:
        """获取允许的文件扩展名列表"""
        return self.ALLOWED_FILE_EXTENSIONS
    
    # 日志配置
    LOG_LEVEL: str = os.getenv("LOG_LEVEL", "INFO")
    LOG_DIR: str = os.getenv("LOG_DIR", "logs")
    LOG_FILE: str = os.path.join(LOG_DIR, "app.log")
    
    # Redis 配置（可选，用于缓存）
    REDIS_HOST: Optional[str] = os.getenv("REDIS_HOST")
    REDIS_PORT: int = int(os.getenv("REDIS_PORT", 6379))
    REDIS_DB: int = int(os.getenv("REDIS_DB", 0))
    REDIS_PASSWORD: Optional[str] = os.getenv("REDIS_PASSWORD")
    ENABLE_CACHE: bool = os.getenv("ENABLE_CACHE", "False").lower() == "true"
    
    # 缓存配置
    CACHE_TTL: int = int(os.getenv("CACHE_TTL", "3600"))  # 缓存过期时间（秒），默认 1 小时
    CACHE_PREFIX: str = os.getenv("CACHE_PREFIX", "finyx_ai:")  # 缓存键前缀
    
    # 监控告警配置
    ALERT_TYPE: str = os.getenv("ALERT_TYPE", "none")  # 告警类型: email, webhook, none
    # 邮件告警配置
    SMTP_HOST: Optional[str] = os.getenv("SMTP_HOST")
    SMTP_PORT: int = int(os.getenv("SMTP_PORT", 587))
    SMTP_USERNAME: Optional[str] = os.getenv("SMTP_USERNAME")
    SMTP_PASSWORD: Optional[str] = os.getenv("SMTP_PASSWORD")
    ALERT_FROM_EMAIL: Optional[str] = os.getenv("ALERT_FROM_EMAIL")
    ALERT_TO_EMAIL: Optional[str] = os.getenv("ALERT_TO_EMAIL")
    # Webhook 告警配置
    ALERT_WEBHOOK_URL: Optional[str] = os.getenv("ALERT_WEBHOOK_URL")
    # 告警阈值
    ERROR_RATE_THRESHOLD: float = float(os.getenv("ERROR_RATE_THRESHOLD", "0.1"))  # 错误率阈值 (10%)
    RESPONSE_TIME_THRESHOLD: int = int(os.getenv("RESPONSE_TIME_THRESHOLD", "5000"))  # 响应时间阈值 (毫秒)
    ALERT_COOLDOWN: int = int(os.getenv("ALERT_COOLDOWN", "300"))  # 告警冷却时间 (秒)
    
    class Config:
        env_file = ".env"
        case_sensitive = True


@lru_cache()
def get_settings() -> Settings:
    """获取配置实例（单例模式）"""
    return Settings()


settings = get_settings()