"""
Application configuration
Loads from environment variables with defaults
"""
from pydantic_settings import BaseSettings
from functools import lru_cache


class Settings(BaseSettings):
    """Application settings"""
    
    # App
    app_name: str = "Cisco Config Builder"
    app_version: str = "0.1.0"
    debug: bool = False
    
    # API
    api_prefix: str = "/api/v1"
    
    # Database
    database_url: str = "postgresql://cisco_user:cisco_pass@localhost:5432/cisco_builder"
    
    # JWT
    secret_key: str = "change-this-secret-key-in-production"
    algorithm: str = "HS256"
    access_token_expire_minutes: int = 30
    
    # SSH / Netmiko
    ssh_timeout: int = 30
    ssh_port: int = 22
    netmiko_device_type: str = "cisco_ios"
    
    # Security
    enable_ssh_push: bool = True
    require_confirmation_before_push: bool = True
    max_config_size_mb: int = 10
    
    class Config:
        env_file = ".env"
        case_sensitive = False


@lru_cache()
def get_settings() -> Settings:
    """Get cached settings instance"""
    return Settings()