#!/bin/sh -e
#                                     ╭───────────────╮
#                                     │ env functions │
#                                     ╰───────────────╯

# ───────────────────────────────────< ANSI color codes >───────────────────────────────────
RED='\033[0;31m'
CYAN='\033[0;36m'
YELLOW='\033[0;33m'
LIGHT_GREEN='\033[0;92m'
BOLD='\033[1m'
NC='\033[0m' # No Color

echo_error() {
  printf "${BOLD}${RED}ERROR: ${NC}${RED}%s${NC}\n" "$1" >&2
}

echo_info() {
  printf "${BOLD}${CYAN}INFO: ${NC}${CYAN}%s${NC}\n" "$1"
}

echo_warning() {
  printf "${BOLD}${YELLOW}WARNING: ${NC}${YELLOW}%s${NC}\n" "$1"
}

echo_note() {
  printf "${BOLD}${LIGHT_GREEN}NOTE: ${NC}${LIGHT_GREEN}%s${NC}\n" "$1"
}

# ────────────────< function to check if the given command exists silently >────────────────
command_exists() {
  command -v "$@" >/dev/null 2>&1
}

# ─────────────< Check if the user is root and set sudo variable if necessary >─────────────
check_root() {
  if [ "$(id -u)" -ne 0 ]; then
    if command_exists sudo; then
      echo_info "User is not root. Using sudo for privileged operations."
      _sudo="sudo"
    else
      echo_error "No sudo found and you're not root! Can't install packages."
      return 1
    fi
  else
    echo_info "Root access confirmed."
    _sudo=""
  fi
}

# ─< Distribution detection and installation >────────────────────────────────────────
get_packager() {
  if [ -e /etc/os-release ]; then
    echo_info "Detecting distribution..."
    . /etc/os-release

    ID=$(printf "%s" "$ID" | tr '[:upper:]' '[:lower:]')
    ID_LIKE=$(printf "%s" "$ID_LIKE" | tr '[:upper:]' '[:lower:]')

    case "$ID" in
    ubuntu | pop) _install() { $_sudo apt-get install --assume-yes "$@"; } ;;
    debian) _install() { $_sudo apt-get install --assume-yes "$@"; } ;;
    fedora) _install() { $_sudo dnf install -y "$@"; } ;;
    alpine) _install() { $_sudo apk add "$@"; } ;;
    arch | manjaro | garuda | endeavour) _install() { $_sudo pacman -S --noconfirm "$@"; } ;;
    opensuse*) _install() { $_sudo zypper in -y "$@"; } ;;
    *)
      if echo "$ID_LIKE" | grep -q "debian"; then
        _install() { $_sudo apt-get install --assume-yes "$@"; }
      elif echo "$ID_LIKE" | grep -q "ubuntu"; then
        _install() { $_sudo apt-get install --assume-yes "$@"; }
      elif echo "$ID_LIKE" | grep -q "arch"; then
        _install() { $_sudo pacman -S --noconfirm "$@"; }
      elif echo "$ID_LIKE" | grep -q "fedora"; then
        _install() { $_sudo dnf install -y "$@"; }
      elif echo "$ID_LIKE" | grep -q "suse"; then
        _install() { $_sudo zypper in -y "$@"; }
      else
        echo_error "Unsupported distribution: $ID"
        return 1
      fi
      ;;
    esac
  else
    echo_error "Unable to detect distribution. /etc/os-release not found."
    return 1
  fi
}

# ──────────────────────────< define your functions/script here >────────────────────────
dependencies() {
  _deps="krb5-user realmd sssd-tools sssd libnss-sss libpam-sss adcli"

  for dependency in $_deps; do
    if ! command_exists "$dependency"; then
      echo_info "Installing $dependency.."
      sleep 0.3
      if ! _install "$dependency"; then
        echo_error "$dependency - could not be installed!"
      else
        echo_note "$dependency - was installed successfully!"
      fi
    else
      echo_note "$dependency is already installed."
    fi
  done
}

_join() {
  domain="swu.dom"
  echo_note "You are trying to connect to $domain.."
  sleep 1
  echo_note "Please enter an administrator user like this: [example-user]"
  printf "Admin User: " >&2
  read -r _admin </dev/tty

  if [ -n "$_admin" ]; then
    if realm join -v -U "$_admin@$domain" "$domain"; then
      echo_note "Successfully joined domain $domain."
    else
      echo_error "Failed to join domain $domain."
      return 1
    fi
  else
    echo_error "Administrator username cannot be empty."
    return 1
  fi
}

# ───────────────────────────────< define the main function >───────────────────────────────
main() {
  if check_root; then
    get_packager &&
      dependencies &&
      _join
  else
    echo_error "Root privileges are required. Exiting."
    return 1
  fi
}

# ──────────────────────────────< execute the main function >────────────────────────────
main