defmodule RemoteControlCar do
  @enforce_keys [:nickname]
  defstruct [:nickname, battery_percentage: 100, distance_driven_in_meters: 0]

  def new(nickname \\ "none"), do: %__MODULE__{nickname: nickname}

  def display_distance(%__MODULE__{distance_driven_in_meters: distance}),
    do: "#{distance} meters"

  def display_battery(%__MODULE__{battery_percentage: 0}), do: "Battery empty"

  def display_battery(%__MODULE__{battery_percentage: battery}), do: "Battery at #{battery}%"

  def drive(%__MODULE__{battery_percentage: 0} = car),
    do: %{car | battery_percentage: 0, distance_driven_in_meters: 0}

  def drive(%__MODULE__{battery_percentage: battery, distance_driven_in_meters: distance} = car),
    do: %{car | battery_percentage: battery - 1, distance_driven_in_meters: distance + 20}
end