defmodule Todo.CSVImporter do
  alias Todo.List

  def import(path) do
    path
    |> File.stream!()
    |> Stream.map(&parse_line/1)
    |> List.new()
  end

  defp parse_line(line) do
    line
    |> String.trim()
    |> String.split(",")
    |> create_entry()
  end

  defp create_entry([date, title]) do
    final_date = parse_date(date)

    %{date: final_date, title: title}
  end

  defp parse_date(string) do
    [year, month, day] = string |> String.split("-") |> Enum.map(&String.to_integer/1)

    Date.new!(year, month, day)
  end
end