defmodule Retort do
  @moduledoc """
  Supervise RabbitMQ connection, so it can be reconnected
  """

  import Supervisor.Spec

  use Application

  # Functions

  ## Application callbacks

  # See http://elixir-lang.org/docs/stable/elixir/Application.html
  # for more information on OTP Applications
  @spec start(any, any) :: {:ok, pid}
  def start(_type, _args) do
    import Supervisor.Spec, warn: false

    children = [
      worker(Retort.Connection, [nil, [name: Retort.Connection]])
      |
      repo_children()
    ]

    # See http://elixir-lang.org/docs/stable/elixir/Supervisor.html
    # for other strategies and supported options
    opts = [strategy: :one_for_one, name: Retort]
    Supervisor.start_link(children, opts)
  end

  ## Private Functions

  defp repo_children do
    :retort
    |> Application.get_env(:ecto_repos, [])
    |> Enum.map(&repo_worker/1)
  end

  defp repo_worker(repo), do: worker(repo, [])
end