"""Data models for host configuration."""

from dataclasses import dataclass
from typing import Optional


@dataclass
class HostConfig:
    """Configuration for a new NixOS host."""

    hostname: str
    ip: Optional[str] = None
    cpu: int = 2
    memory: int = 2048
    disk: str = "20G"

    @property
    def is_static_ip(self) -> bool:
        """Check if host uses static IP configuration."""
        return self.ip is not None

    @property
    def gateway(self) -> str:
        """Default gateway for the network."""
        return "10.69.13.1"

    @property
    def nameservers(self) -> list[str]:
        """DNS nameservers for the network."""
        return ["10.69.13.5", "10.69.13.6"]

    @property
    def domain(self) -> str:
        """Domain name for the network."""
        return "home.2rjus.net"

    @property
    def state_version(self) -> str:
        """NixOS state version for new hosts."""
        return "25.11"

    def validate(self) -> None:
        """Validate configuration constraints."""
        if not self.hostname:
            raise ValueError("Hostname cannot be empty")

        if self.cpu < 1:
            raise ValueError("CPU cores must be at least 1")

        if self.memory < 512:
            raise ValueError("Memory must be at least 512 MB")

        if not self.disk:
            raise ValueError("Disk size cannot be empty")