defmodule MultisortDecimalTest do
  use ExUnit.Case

  @data [
    %{multiplier: Decimal.from_float(1.0), points: Decimal.from_float(400.0)},
    %{multiplier: Decimal.from_float(1.0), points: Decimal.from_float(500.0)},
    %{multiplier: Decimal.from_float(0.9), points: Decimal.from_float(600.0)},
    %{multiplier: Decimal.from_float(0.9), points: Decimal.from_float(700.0)}
  ]

  @expected [
    %{multiplier: Decimal.from_float(1.0), points: Decimal.from_float(500.0)},
    %{multiplier: Decimal.from_float(1.0), points: Decimal.from_float(400.0)},
    %{multiplier: Decimal.from_float(0.9), points: Decimal.from_float(700.0)},
    %{multiplier: Decimal.from_float(0.9), points: Decimal.from_float(600.0)}
  ]

  def compare(d1, d2) do
    case Decimal.cmp(d1, d2) do
      :gt -> 1.0
      :eq -> 0.0
      :lt -> -1.0
    end
  end

  def sort(data) do
    data
    |> Enum.sort_by(fn row ->
      {to_string(row.multiplier), to_string(row.points)}
    end)
    |> Enum.reverse()
  end

  test "works" do
    assert sort(@data) == @expected
  end
end