function show_usage() {
  echo "Usage: $0 [-e <email>] [-s <server>] [-v] [-d]"
  echo "Options:"
  echo "  -e <email>    Set email address"
  echo "  -s <server>   Set server URL"
  echo "  -v            Get module version"
  echo "  -d            Get debug mode status"
  exit 1
}

function set_email() {
  if [[ "$1" == "" ]]; then
    echo "[ERROR] Email address is required when using -e"
    show_usage
  fi

  local email="$1"
  local config_file="/data/adb/beesrv/config.txt"

  touch "$config_file"

  grep -v "^EMAIL=" "$config_file" > "$config_file.tmp" 2>/dev/null || true
  echo "EMAIL=$email" >> "$config_file.tmp"
  mv "$config_file.tmp" "$config_file"

  echo "Success"
}

function set_server() {
  if [[ "$1" == "" ]]; then
    echo "[ERROR] Server URL is required when using -s"
    show_usage
  fi

  local server_url="$1"
  local config_file="/data/adb/beesrv/config.txt"

  touch "$config_file"

  grep -v "^SERVER=" "$config_file" > "$config_file.tmp" 2>/dev/null || true
  echo "SERVER=$server_url" >> "$config_file.tmp"
  mv "$config_file.tmp" "$config_file"

  echo "Success"
}

function get_version() {
  local mod_prop
  mod_prop="$(dirname "$0")/../module.prop"
  if [ -f "$mod_prop" ]; then
    version=$(grep "version=" "$mod_prop" | cut -d'=' -f2)
    echo "$version"
  else
    echo "Unknown"
  fi
}

function get_debug_mode() {
  local config_file="/data/adb/beesrv/config.txt"
  if [ -f "$config_file" ] && grep -q "^DEBUG=true$" "$config_file"; then
    echo "true"
  else
    echo "false"
  fi
}

while getopts "e:s:vd" opt; do
  case ${opt} in
    e )
      set_email "$OPTARG"
      ;;
    s )
      set_server "$OPTARG"
      ;;
    v )
      get_version
      ;;
    d )
      get_debug_mode
      ;;
    \? )
      echo "[ERROR] Invalid option -$OPTARG"
      show_usage
      ;;
    : )
      echo "[ERROR] Option -$OPTARG requires an argument"
      show_usage
      ;;
  esac
done