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_driven_in_meters} = _remote_car) do
    "#{distance_driven_in_meters} meters"
  end

  def display_battery(%__MODULE__{battery_percentage: 0} = _remote_car) do
    "Battery empty"
  end

  def display_battery(%__MODULE__{battery_percentage: battery_percentage} = _remote_car) do
    "Battery at #{battery_percentage}%"
  end

  def drive(%__MODULE__{battery_percentage: 0} = remote_car), do: remote_car
  def drive(%__MODULE__{} = remote_car) do
    %{
      remote_car |
      battery_percentage: remote_car.battery_percentage - 1,
      distance_driven_in_meters: remote_car.distance_driven_in_meters + 20,
    }
  end
end