# This script is meant to be sourced.
# It's not for directly running.

function vianix-warning(){
  printf "${STY_YELLOW}"
  printf "Currently \"--via-nix\" will run:\n"
  printf "  home-manager switch --flake .#illogical_impulse\n"
  printf "If you are already using home-manager,\n"
  printf "it may override your current config,\n"
  printf "despite that this should be reversible.\n"
  printf "${STY_RST}"
  pause
}
function install_nix(){
  # https://github.com/NixOS/experimental-nix-installer
  local cmd=nix

  x mkdir -p ${REPO_ROOT}/cache
  x curl -JLo ${REPO_ROOT}/cache/nix-installer https://artifacts.nixos.org/experimental-installer
  x sh ${REPO_ROOT}/cache/nix-installer install
  try source '/nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh'

  command -v $cmd && return
  echo "Failed in installing $cmd."
  echo "Please install it by yourself and then retry."
  return 1
}
function install_home-manager(){
  # https://nix-community.github.io/home-manager/index.xhtml#sec-install-standalone
  local cmd=home-manager
  # Maybe installed already, just not sourced yet
  try source $HOME/.nix-profile/etc/profile.d/hm-session-vars.sh
  command -v $cmd && return

  x nix-channel --add https://nixos.org/channels/nixos-25.11 nixpkgs-home
  x nix-channel --add https://github.com/nix-community/home-manager/archive/release-25.11.tar.gz home-manager
  x nix-channel --update
  x env NIX_PATH="nixpkgs=$HOME/.nix-defexpr/channels/nixpkgs-home" nix-shell '<home-manager>' -A install

  command -v $cmd && return
  echo "Failed in installing $cmd."
  echo "Please install it by yourself and then retry."
  echo ""
  echo "Hint: It's also possible that the installation is actually successful,"
  echo "but your \"\$PATH\" is not properly set."
  echo "This can happen when you have used \"su user\" to switch user."
  echo "If this is the problem, use \"su - user\" instead."
  return 1
}
function hm_deps(){
  SETUP_HM_DIR="${REPO_ROOT}/sdata/dist-nix/home-manager"
  SETUP_USERNAME_NIXFILE="${SETUP_HM_DIR}/username.nix"
  echo "\"$(whoami)\"" > "${SETUP_USERNAME_NIXFILE}"
  x git add "${SETUP_USERNAME_NIXFILE}"
  cd $SETUP_HM_DIR
  x home-manager switch --flake .#illogical_impulse \
    --extra-experimental-features nix-command \
    --extra-experimental-features flakes
  x sudo /nix/store/*-non-nixos-gpu/bin/non-nixos-gpu-setup
  cd $REPO_ROOT
  x git rm -f "${SETUP_USERNAME_NIXFILE}"
}

##################################################
##################################################

vianix-warning

TEST_CMDS=(curl fish swaylock gnome-keyring)
ensure_cmds "${TEST_CMDS[@]}"

if ! command -v nix >/dev/null 2>&1;then
  echo -e "${STY_YELLOW}[$0]: \"nix\" not found.${STY_RST}"
  showfun install_nix
  v install_nix
fi
if ! command -v home-manager >/dev/null 2>&1;then
  echo -e "${STY_YELLOW}[$0]: \"home-manager\" not found.${STY_RST}"
  showfun install_home-manager
  v install_home-manager
fi

showfun hm_deps
v hm_deps