defmodule Tesourex.Helper do
  def most_recent(a, b) do
    case Date.compare(to_date(a[:last_updated_at]), to_date(b[:last_updated_at])) do
      :gt -> a
      _ -> b
    end
  end

  def to_date(tesouro_date) do
    parts = tesouro_date
            |> String.split("/")
            |> Enum.reverse
            |> Enum.map(&String.to_integer/1)

    {:ok, date} = apply(&Date.new/3, parts)

    date
  end

  def parse_value(string) do
    {integer, _} = string
                   |> String.replace(~r/[R\$\.\,]/, "")
                   |> Integer.parse

    integer / 100
  end
end