defmodule VehiclesMock do
  use GenServer

  defstruct [:pid]
  alias __MODULE__, as: State

  # API

  def start_link(opts) do
    GenServer.start_link(__MODULE__, opts, name: Keyword.fetch!(opts, :name))
  end

  def kill(name), do: GenServer.call(name, :kill)
  def restart(name), do: GenServer.call(name, :restart)

  def subscribe_to_summary(name, car_id) do
    GenServer.call(name, {:subscribe_to_summary, car_id})
  end

  # Callbacks

  @impl true
  def init(opts) do
    {:ok, %State{pid: Keyword.fetch!(opts, :pid)}}
  end

  @impl true
  def handle_call({:subscribe_to_summary, _car_id} = action, _from, %State{pid: pid} = state) do
    send(pid, {VehiclesMock, action})
    {:reply, :ok, state}
  end

  def handle_call(:kill, _from, %State{pid: pid} = state) do
    send(pid, {VehiclesMock, :kill})
    {:reply, true, state}
  end

  def handle_call(:restart, _from, %State{pid: pid} = state) do
    send(pid, {VehiclesMock, :restart})
    {:reply, :ok, state}
  end
end