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

export NIX_CONFIG="${NIX_CONFIG:-}
experimental-features = nix-command flakes
accept-flake-config = false
warn-dirty = false
"

if ! command -v nix >/dev/null 2>&1; then
  echo "Installing Nix in single-user mode..."
  sh <(curl -L https://nixos.org/nix/install) --no-daemon
  # shellcheck disable=SC1090
  . "$HOME/.nix-profile/etc/profile.d/nix.sh"
fi

mkdir -p "$HOME/.config/nix"
cat > "$HOME/.config/nix/nix.conf" <<'EOF'
experimental-features = nix-command flakes
accept-flake-config = false
warn-dirty = false
EOF

echo "Nix version:"
nix --version

echo "Available NixOS hosts:"
nix eval --json --no-accept-flake-config .#nixosConfigurations --apply builtins.attrNames | jq -r '.[]'

echo "Evaluating all host toplevel derivations..."
for host in $(nix eval --json --no-accept-flake-config .#nixosConfigurations --apply builtins.attrNames | jq -r '.[]'); do
  echo "==> Evaluating $host"
  nix eval --raw --no-accept-flake-config ".#nixosConfigurations.${host}.config.system.build.toplevel.drvPath"
done

echo "Codex setup complete."