#!/usr/bin/env bash

# Helper script to switch between NixOS configurations

set -e

# Default to the nixos configuration if no argument is provided
CONFIG=${1:-nixos}

# Use nix itself to list available configurations
AVAILABLE_CONFIGS=$(nix flake show --json | jq -r '.nixosConfigurations | keys[]' 2>/dev/null)

# If the above command fails, fall back to a simple grep method
if [ -z "$AVAILABLE_CONFIGS" ]; then
  AVAILABLE_CONFIGS=$(grep -A 100 "nixosConfigurations = {" flake.nix | grep -E "^\s+[a-zA-Z0-9_-]+ = " | sed 's/^\s*\([a-zA-Z0-9_-]*\)\s*=.*/\1/')
fi

# Check if the configuration exists
if ! echo "$AVAILABLE_CONFIGS" | grep -q "^${CONFIG}$"; then
  echo "Error: Configuration '$CONFIG' not found in flake.nix"
  echo "Available configurations:"
  echo "$AVAILABLE_CONFIGS" | sed 's/^/  - /'
  exit 1
fi

echo "Switching to configuration: $CONFIG"
sudo nixos-rebuild switch --flake ".#$CONFIG"
echo "Successfully switched to $CONFIG configuration"