#!/usr/bin/env bash
# Installs packages to the nix profile using nix profile
# Reference: https://nixos.org/manual/nixpkgs/stable/#sec-declarative-package-management

set -ex

nix_packages=(
  # Personal tools
  "vimHugeX"
  "ranger"
  "jq"
  "yq"

  "pass"
  "gnupg"

  # Professional tools
  "kubernetes-helm"
  "vault"
  "kubectl"
  "rancher"
  "terraform"
  "terragrunt"
  "skopeo"
  "awscli2"
)


mkdir -p ~/.config/nixpkgs/
templated_insert=$(for nix_package in ${nix_packages[@]}; do echo "                $nix_package"; done)


# Reference: https://discourse.nixos.org/t/nix-profile-in-combination-with-declarative-package-management/21228/9
cat << EOF > ~/.config/nixpkgs/flake.nix
{
  description = "A declarative system installation";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-22.11"; # also possible: `nixos-unstable`
  };

  outputs = { self, nixpkgs }:
    let
      supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];

      # Generate a user-friendly version number.
      version = builtins.substring 0 8 self.lastModifiedDate;

      # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;

      # Nixpkgs instantiated for supported system types.
      nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; });
    in {
      packages = forAllSystems (system:
        let
          pkgs = nixpkgsFor.\${system};
        in {
          default = self.packages.\${system}.myPackageCollection;
          myPackageCollection = # libs and clis
            let
              pkgs = nixpkgs.legacyPackages.\${system}; # here we need just legacy packages
            in pkgs.buildEnv {
              name = "myPackages";
              paths = with pkgs; [
${templated_insert}
              ];

               extraOutputsToInstall = [ "man" "doc" ];
            };
        }); # packages
    }; # outputs
}
EOF

install_nix_packages()
{
  # The name of the package we are going to install, needed to check for presence/uninstall
  package_name=packages.x86_64-linux.myPackageCollection
  if [ "${nix_packages[*]}" ]; then
    if nix profile list | cut -d' ' -f 2 | grep -q "${package_name}"; then
      echo "Removing previous version of profile"
      nix profile remove "${package_name}"
    fi
    echo "Installing profile"
    nix profile install "${HOME}/.config/nixpkgs/flake.nix#myPackageCollection"
  fi
}

install_nix_packages