defmodule Exoddic.Converter.Hk do
@behaviour Exoddic.Converter
@moduledoc """
.hk-style odds
"""
def from_prob(amount) when amount == 0.00, do: 0.0
def from_prob(amount) when amount >= 0.50, do: 1 / amount - 1
def from_prob(amount) when amount < 0.50, do: (1 - amount) / amount
def to_prob(amount) when amount == 0, do: 0.0
def to_prob(amount) when amount != 0, do: 1 / (amount + 1)
@doc "Formatted to three decimal places"
def for_display(amount), do: :erlang.float_to_binary(amount, decimals: 3)
end