#!/usr/bin/env bash
set -euo pipefail

if ! command -v gum &> /dev/null; then
  echo "gum (from charm.sh) is required but not found in PATH."
  exit 1
fi

if ! command -v jq &> /dev/null; then
  echo "jq is required but not found in PATH."
  exit 1
fi

# List flake configs without evaluating them
HOSTS=()
while IFS= read -r line; do
  HOSTS+=("$line")
done < <(nix flake show --json | jq -r '.nixosConfigurations | keys[]')

if [ ${#HOSTS[@]} -eq 0 ]; then
  echo "No NixOS configurations found in flake."
  exit 1
fi

# Prompt user for a config
SELECTED=$(printf "%s\n" "${HOSTS[@]}" | gum choose --header="Select a NixOS VM config:")

if [ -z "$SELECTED" ]; then
  echo "No hostname selected. Exiting."
  exit 1
fi

echo "Building VM for flake config: $SELECTED"

# Build the VM
nix run ".#nixosConfigurations.$SELECTED.config.system.build.vm"