#!/usr/bin/env bash

# Configure DNS declaratively for Nomarchy NixOS.
# Hybrid: updates /etc/nixos/state.json and runs sys-update.

STATE_FILE="/etc/nixos/state.json"

if [[ -z $1 ]]; then
  dns=$(gum choose --height 6 --header "Select DNS provider" Cloudflare Google DHCP Custom)
else
  dns=$1
fi

case "$dns" in
Cloudflare|Google|DHCP)
  sudo jq ".dns = \"$dns\"" "$STATE_FILE" > /tmp/state.json && sudo mv /tmp/state.json "$STATE_FILE"
  ;;

Custom)
  echo "Enter your DNS servers (space-separated, e.g. '192.168.1.1 1.1.1.1'):"
  read -r dns_servers

  if [[ -z $dns_servers ]]; then
    echo "Error: No DNS servers provided."
    exit 1
  fi
  
  # Convert to JSON array
  dns_array=$(echo "$dns_servers" | jq -R 'split(" ")')
  sudo jq ".dns = \"Custom\" | .customDns = $dns_array" "$STATE_FILE" > /tmp/state.json && sudo mv /tmp/state.json "$STATE_FILE"
  ;;
esac

echo "DNS configured to $dns. Applying changes..."
sudo sys-update