from pydantic_settings import BaseSettings
from typing import List, Optional
from functools import lru_cache


class Settings(BaseSettings):
    # Application
    APP_NAME: str = "SmartLife Monitor"
    APP_ENV: str = "development"
    DEBUG: bool = True
    SECRET_KEY: str = "change-this-in-production"
    API_V1_PREFIX: str = "/api/v1"
    
    # Database
    DATABASE_URL: str = "mysql+aiomysql://root:@localhost:3306/smartlife_db?charset=utf8mb4"
    DATABASE_ECHO: bool = False
    
    # Redis
    REDIS_URL: str = "redis://localhost:6379/0"
    
    # JWT
    JWT_SECRET_KEY: str = "jwt-secret-change-this"
    JWT_ALGORITHM: str = "HS256"
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
    REFRESH_TOKEN_EXPIRE_DAYS: int = 7
    
    # LifeSmart API
    LIFESMART_API_URLS: dict = {
        "china": "https://api.ilifesmart.com",
        "global": "https://api.ilifesmart.com",
        "europe": "https://api.ilifesmart.com",  # Main server handles all regions
        "north_america": "https://api.us.ilifesmart.com",
        "japan": "https://api.ilifesmart.com",
        "asia_pacific": "https://api.ilifesmart.com",
    }
    LIFESMART_DEFAULT_REGION: str = "global"
    
    # Email
    SENDGRID_API_KEY: Optional[str] = None
    EMAIL_FROM: str = "noreply@smartlife.local"
    
    # Frontend
    FRONTEND_URL: str = "http://localhost:3000"
    
    # CORS
    CORS_ORIGINS: List[str] = [
        "http://localhost:3000", 
        "http://127.0.0.1:3000",
        "http://localhost:3001",
        "http://localhost:3002",
        "http://127.0.0.1:3001",
        "http://127.0.0.1:3002"
    ]
    
    # Celery
    CELERY_BROKER_URL: str = "redis://localhost:6379/1"
    CELERY_RESULT_BACKEND: str = "redis://localhost:6379/2"
    
    class Config:
        env_file = ".env"
        case_sensitive = True


@lru_cache()
def get_settings() -> Settings:
    return Settings()


settings = get_settings()