-module(gleam_synapses@model@encoding@continuous_attribute).
-compile(no_auto_import).

-export([parse/1, updated/2, encode/2, decode/2, serialized/1, deserialized/1, json_encoded/1, json_decoder/0]).

-spec parse(binary()) -> float().
parse(S) ->
    Trimmed = gleam@string:trim(S),
    case {gleam@float:parse(Trimmed), gleam@int:parse(Trimmed)} of
        {{ok, X}, _} ->
            X;

        {_, {ok, X@1}} ->
            gleam@int:to_float(X@1)
    end.

-spec updated(
    gleam_synapses@model@encoding@serialization:attribute(),
    gleam@map:map_(binary(), binary())
) -> gleam_synapses@model@encoding@serialization:attribute().
updated(Continuous_attribute, Datapoint) ->
    {continuous_attribute, Key, Min, Max} = Continuous_attribute,
    {ok, V} = gleam@result:map(gleam@map:get(Datapoint, Key), fun parse/1),
    {continuous_attribute,
     Key,
     gleam@float:min(V, Min),
     gleam@float:max(V, Max)}.

-spec encode(gleam_synapses@model@encoding@serialization:attribute(), binary()) -> gleam_zlists@interop:z_list(float()).
encode(Continuous_attribute, Value) ->
    {continuous_attribute, _, Min, Max} = Continuous_attribute,
    gleam_zlists:singleton(case Min =:= Max of
            true ->
                0.5;

            false ->
                Nomin = parse(Value) - Min,
                Denomin = Max - Min,
                case Denomin of
                    0.0 -> 0.0;
                    Gleam@denominator -> Nomin / Gleam@denominator
                end
        end).

-spec decode(
    gleam_synapses@model@encoding@serialization:attribute(),
    gleam_zlists@interop:z_list(float())
) -> binary().
decode(Continuous_attribute, Encoded_values) ->
    {continuous_attribute, _, Min, Max} = Continuous_attribute,
    gleam@float:to_string(case Min =:= Max of
            true ->
                Min;

            false ->
                {ok, V} = gleam_zlists:head(Encoded_values),
                Factor = Max - Min,
                (V * Factor) + Min
        end).

-spec serialized(gleam_synapses@model@encoding@serialization:attribute()) -> gleam_synapses@model@encoding@serialization:attribute_serialized().
serialized(Continuous_attribute) ->
    {continuous_attribute, Key, Min, Max} = Continuous_attribute,
    {continuous_attribute_serialized, Key, Min, Max}.

-spec deserialized(
    gleam_synapses@model@encoding@serialization:attribute_serialized()
) -> gleam_synapses@model@encoding@serialization:attribute().
deserialized(Continuous_attribute_serialized) ->
    {continuous_attribute_serialized, Key, Min, Max} = Continuous_attribute_serialized,
    {continuous_attribute, Key, Min, Max}.

-spec json_encoded(
    gleam_synapses@model@encoding@serialization:attribute_serialized()
) -> gleam_synapses@model@edited_jsone:json_value().
json_encoded(Continuous_attribute_serialized) ->
    {continuous_attribute_serialized, Key, Min, Max} = Continuous_attribute_serialized,
    gleam_synapses@model@edited_jsone:object(
        [{<<"key"/utf8>>, gleam_synapses@model@edited_jsone:string(Key)},
         {<<"min"/utf8>>, gleam_synapses@model@edited_jsone:float(Min)},
         {<<"max"/utf8>>, gleam_synapses@model@edited_jsone:float(Max)}]
    ).

-spec json_decoder() -> decode:decoder(gleam_synapses@model@encoding@serialization:attribute_serialized()).
json_decoder() ->
    decode:map3(
        fun(A, B, C) -> {continuous_attribute_serialized, A, B, C} end,
        decode:field(<<"key"/utf8>>, decode:string()),
        decode:field(<<"min"/utf8>>, decode:float()),
        decode:field(<<"max"/utf8>>, decode:float())
    ).