-module(themis@number).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([int/1, dec/1, pos_inf/0, neg_inf/0, nan/0, compare/2, add/2]).
-export_type([comparison_error/0]).

-type comparison_error() :: na_n_value.

-file("/git/Themis/src/themis/number.gleam", 11).
-spec int(integer()) -> internal@prometheus:number_().
int(Value) ->
    {int, Value}.

-file("/git/Themis/src/themis/number.gleam", 16).
-spec dec(float()) -> internal@prometheus:number_().
dec(Value) ->
    {dec, Value}.

-file("/git/Themis/src/themis/number.gleam", 21).
-spec pos_inf() -> internal@prometheus:number_().
pos_inf() ->
    pos_inf.

-file("/git/Themis/src/themis/number.gleam", 26).
-spec neg_inf() -> internal@prometheus:number_().
neg_inf() ->
    neg_inf.

-file("/git/Themis/src/themis/number.gleam", 31).
-spec nan() -> internal@prometheus:number_().
nan() ->
    na_n.

-file("/git/Themis/src/themis/number.gleam", 37).
-spec compare(internal@prometheus:number_(), internal@prometheus:number_()) -> {ok,
        gleam@order:order()} |
    {error, comparison_error()}.
compare(Val1, Val2) ->
    case {Val1, Val2} of
        {V1, V2} when V1 =:= V2 ->
            {ok, eq};

        {{int, V1@1}, {int, V2@1}} ->
            {ok, gleam@int:compare(V1@1, V2@1)};

        {{dec, V1@2}, {dec, V2@2}} ->
            {ok, gleam@float:compare(V1@2, V2@2)};

        {pos_inf, _} ->
            {ok, gt};

        {neg_inf, _} ->
            {ok, lt};

        {_, pos_inf} ->
            {ok, lt};

        {_, neg_inf} ->
            {ok, gt};

        {{dec, D}, {int, I}} ->
            {ok, gleam@float:compare(D, erlang:float(I))};

        {{int, I@1}, {dec, D@1}} ->
            {ok, gleam@float:compare(erlang:float(I@1), D@1)};

        {na_n, _} ->
            {error, na_n_value};

        {_, na_n} ->
            {error, na_n_value}
    end.

-file("/git/Themis/src/themis/number.gleam", 55).
-spec add(internal@prometheus:number_(), internal@prometheus:number_()) -> internal@prometheus:number_().
add(Val1, Val2) ->
    case {Val1, Val2} of
        {na_n, _} ->
            na_n;

        {_, na_n} ->
            na_n;

        {{int, First}, {int, Second}} ->
            {int, First + Second};

        {{dec, First@1}, {dec, Second@1}} ->
            {dec, gleam@float:add(First@1, Second@1)};

        {{dec, Dec}, {int, Int}} ->
            {dec, gleam@float:add(erlang:float(Int), Dec)};

        {{int, Int}, {dec, Dec}} ->
            {dec, gleam@float:add(erlang:float(Int), Dec)};

        {pos_inf, neg_inf} ->
            na_n;

        {neg_inf, pos_inf} ->
            na_n;

        {pos_inf, _} ->
            pos_inf;

        {_, pos_inf} ->
            pos_inf;

        {neg_inf, _} ->
            neg_inf;

        {_, neg_inf} ->
            neg_inf
    end.