# Copyright (c) 2019-2020, see AUTHORS. Licensed under MIT License, see LICENSE.

{ config, lib, customPkgs, writeText }:

let
  inherit (customPkgs.packageInfo) cacert coreutils nix;
in

writeText "login-inner" ''
  # This file is generated by nix-on-droid. DO NOT EDIT.

  set -eu -o pipefail

  [ "$#" -gt 0 ] || echo "Welcome to Nix-on-Droid!"

  [ "$#" -gt 0 ] || echo "If nothing works, use the rescue shell and read ${config.build.installationDir}/usr/lib/login-inner"
  [ "$#" -gt 0 ] || echo "If it does not help, report bugs at https://github.com/t184256/nix-on-droid-bootstrap/issues"

  ${lib.optionalString (! config.build.initialBuild) ''
  set +u
  . "/nix/var/nix/profiles/per-user/$USER/profile/etc/profile.d/nix-on-droid-session-init.sh"
  set -u
  ''
  }

  ${lib.optionalString config.build.initialBuild ''
    if [ -e /etc/UNINTIALISED ]; then
      echo "Set default user profile..."
      ${nix}/bin/nix-env --switch-profile /nix/var/nix/profiles/per-user/$USER/profile

      [ "$#" -gt 0 ] || echo "Sourcing Nix environment..."
      . ${nix}/etc/profile.d/nix.sh

      export NIX_SSL_CERT_FILE=${cacert}

      echo "Installing and updating nix-channels..."
      ${nix}/bin/nix-channel --add ${config.build.channel.nixpkgs} nixpkgs
      ${nix}/bin/nix-channel --update nixpkgs
      ${nix}/bin/nix-channel --add ${config.build.channel.nix-on-droid} nix-on-droid
      ${nix}/bin/nix-channel --update nix-on-droid

      echo "Copy default nix-on-droid config..."
      ${coreutils}/bin/mkdir --parents $HOME/.config/nixpkgs
      ${coreutils}/bin/cp $(${nix}/bin/nix-instantiate --eval --expr "<nix-on-droid/modules/environment/login/nix-on-droid.nix.default>") $HOME/.config/nixpkgs/nix-on-droid.nix
      ${coreutils}/bin/chmod u+w $HOME/.config/nixpkgs/nix-on-droid.nix

      echo "Installing first nix-on-droid generation..."
      ${nix}/bin/nix build --no-link --file "<nix-on-droid>" nix-on-droid
      $(${nix}/bin/nix path-info --file "<nix-on-droid>" nix-on-droid)/bin/nix-on-droid switch

      echo
      echo "Congratulations! Now you have Nix installed with some default packages like bashInteractive, \
    coreutils, cacert and most important nix-on-droid itself to manage local configuration, see"
      echo "  nix-on-droid help"
      echo "or in the config file"
      echo "  ~/.config/nixpkgs/nix-on-droid.nix"
      echo
      echo "You can go for the bare nix-on-droid setup or you can configure your phone via home-manager. See \
    config file for further information."
      echo
    fi
  ''}

  [ "$#" -gt 0 ] || echo "Sourcing Nix environment..."
  . $HOME/.nix-profile/etc/profile.d/nix.sh

  if [ -e "$HOME/.nix-profile/etc/profile.d/hm-session-vars.sh" ]; then
    [ "$#" -gt 0 ] || echo "Sourcing home-manager environment..."
    export NIX_PATH=$HOME/.nix-defexpr/channels''${NIX_PATH:+:}$NIX_PATH
    set +u
    . "$HOME/.nix-profile/etc/profile.d/hm-session-vars.sh"
    set -u
  fi

  # Workaround for https://github.com/NixOS/nix/issues/1865
  export NIX_PATH=nixpkgs=$HOME/.nix-defexpr/channels/nixpkgs/:$NIX_PATH

  if [ "$#" -eq 0 ]; then
    exec /usr/bin/env bash
  else
    exec /usr/bin/env "$@"
  fi
''