gloom

-module(affinity).
-compile([no_auto_import, nowarn_unused_vars]).

-export([affinity_max/2]).
-export_type([gloom_affinity/0]).

-type gloom_affinity() :: nothing | everything | something.

-spec affinity_max(gloom_affinity(), gloom_affinity()) -> gloom_affinity().
affinity_max(Left, Right) ->
    case {Left, Right} of
        {nothing, _} ->
            Left;

        {_, nothing} ->
            Right;

        {everything, everything} ->
            Left;

        {everything, something} ->
            Left;

        {something, everything} ->
            Right;

        {something, something} ->
            Left
    end.