"""Application configuration using Pydantic settings."""

from functools import lru_cache
from pydantic_settings import BaseSettings


class Settings(BaseSettings):
    """Application settings loaded from environment variables."""

    # Database
    database_url: str = "mysql+pymysql://mguard:password@localhost:3306/mguard_vpn"

    # Security
    secret_key: str = "change-me-in-production"
    algorithm: str = "HS256"
    access_token_expire_minutes: int = 60 * 24  # 24 hours
    refresh_token_expire_days: int = 7

    # OpenVPN Management Interface
    openvpn_management_host: str = "openvpn"
    openvpn_management_port: int = 7505

    # VPN Network
    vpn_network: str = "10.8.0.0"
    vpn_netmask: str = "255.255.255.0"
    vpn_server_address: str = "vpn.example.com"  # External address for clients to connect

    # Admin defaults
    admin_username: str = "admin"
    admin_password: str = "changeme"
    admin_email: str = "admin@example.com"

    class Config:
        env_file = ".env"
        case_sensitive = False


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