-module(gopenai@embeddings).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([request_to_json/1, embeddings_from_json/1, embeddings/2]).
-export_type([object_type/0, encoding_format/0, embeddings_request/0, embedding/0, usage/0, embeddings_response/0, embeddings_error/0]).

-type object_type() :: list_type | embedding_type.

-type encoding_format() :: float | base64.

-type embeddings_request() :: {embeddings_request,
        list(binary()),
        gopenai@model:model(),
        encoding_format()}.

-type embedding() :: {embedding, object_type(), list(float())}.

-type usage() :: {usage, integer(), integer()}.

-type embeddings_response() :: {embeddings_response,
        object_type(),
        list(embedding()),
        gopenai@model:model(),
        usage()}.

-type embeddings_error() :: {dynamic_error, gleam@dynamic:dynamic_()} |
    {json_decode_error, gleam@json:decode_error()}.

-spec object_type_from_json(gleam@dynamic:dynamic_()) -> {ok, object_type()} |
    {error, list(gleam@dynamic:decode_error())}.
object_type_from_json(Data) ->
    case gleam@dynamic:string(Data) of
        {ok, Str} ->
            case Str of
                <<"list"/utf8>> ->
                    {ok, list_type};

                <<"embedding"/utf8>> ->
                    {ok, embedding_type};

                Default ->
                    {error,
                        [{decode_error,
                                <<"valid object type"/utf8>>,
                                Default,
                                []}]}
            end;

        {error, E} ->
            {error, E}
    end.

-spec encoding_format_to_json(encoding_format()) -> gleam@json:json().
encoding_format_to_json(Ef) ->
    _pipe = case Ef of
        float ->
            <<"float"/utf8>>;

        base64 ->
            <<"base64"/utf8>>
    end,
    gleam@json:string(_pipe).

-spec request_to_json(embeddings_request()) -> binary().
request_to_json(Req) ->
    _pipe = gleam@json:object(
        [{<<"model"/utf8>>, gopenai@model:model_to_json(erlang:element(3, Req))},
            {<<"input"/utf8>>,
                gleam@json:array(
                    erlang:element(2, Req),
                    fun gleam@json:string/1
                )},
            {<<"encoding_format"/utf8>>,
                encoding_format_to_json(erlang:element(4, Req))}]
    ),
    gleam@json:to_string(_pipe).

-spec embedding_from_json(gleam@dynamic:dynamic_()) -> {ok, embedding()} |
    {error, list(gleam@dynamic:decode_error())}.
embedding_from_json(Data) ->
    _pipe = Data,
    (gleam@dynamic:decode2(
        fun(Field@0, Field@1) -> {embedding, Field@0, Field@1} end,
        gleam@dynamic:field(<<"object"/utf8>>, fun object_type_from_json/1),
        gleam@dynamic:field(
            <<"embedding"/utf8>>,
            gleam@dynamic:list(fun gleam@dynamic:float/1)
        )
    ))(_pipe).

-spec embeddings_from_json(binary()) -> {ok, embeddings_response()} |
    {error, gleam@json:decode_error()}.
embeddings_from_json(Data) ->
    _pipe = Data,
    gleam@json:decode(
        _pipe,
        gleam@dynamic:decode4(
            fun(Field@0, Field@1, Field@2, Field@3) -> {embeddings_response, Field@0, Field@1, Field@2, Field@3} end,
            gleam@dynamic:field(<<"object"/utf8>>, fun object_type_from_json/1),
            gleam@dynamic:field(
                <<"data"/utf8>>,
                gleam@dynamic:list(fun embedding_from_json/1)
            ),
            gleam@dynamic:field(
                <<"model"/utf8>>,
                fun gopenai@model:model_from_json/1
            ),
            gleam@dynamic:field(
                <<"usage"/utf8>>,
                gleam@dynamic:decode2(
                    fun(Field@0, Field@1) -> {usage, Field@0, Field@1} end,
                    gleam@dynamic:field(
                        <<"prompt_tokens"/utf8>>,
                        fun gleam@dynamic:int/1
                    ),
                    gleam@dynamic:field(
                        <<"total_tokens"/utf8>>,
                        fun gleam@dynamic:int/1
                    )
                )
            )
        )
    ).

-spec embeddings(gopenai@client:client(), embeddings_request()) -> {ok,
        embeddings_response()} |
    {error, embeddings_error()}.
embeddings(Client, Req) ->
    _assert_subject = gleam@http@request:to(
        gleam@string:concat(
            [erlang:element(2, Client),
                <<"/v1/"/utf8>>,
                begin
                    _pipe = embeddings,
                    gopenai@client:endpoint_to_str(_pipe)
                end]
        )
    ),
    {ok, Request} = case _assert_subject of
        {ok, _} -> _assert_subject;
        _assert_fail ->
            erlang:error(#{gleam_error => let_assert,
                        message => <<"Assertion pattern match failed"/utf8>>,
                        value => _assert_fail,
                        module => <<"gopenai/embeddings"/utf8>>,
                        function => <<"embeddings"/utf8>>,
                        line => 124})
    end,
    _pipe@1 = Request,
    _pipe@2 = gleam@http@request:set_method(_pipe@1, post),
    _pipe@3 = gleam@http@request:prepend_header(
        _pipe@2,
        <<"Content-Type"/utf8>>,
        <<"application/json"/utf8>>
    ),
    _pipe@4 = gleam@http@request:prepend_header(
        _pipe@3,
        <<"Authorization"/utf8>>,
        <<"Bearer "/utf8, (erlang:element(3, Client))/binary>>
    ),
    _pipe@6 = gleam@http@request:set_body(
        _pipe@4,
        begin
            _pipe@5 = Req,
            request_to_json(_pipe@5)
        end
    ),
    _pipe@7 = gleam@httpc:send(_pipe@6),
    _pipe@8 = gleam@result:map_error(_pipe@7, fun(E) -> {dynamic_error, E} end),
    _pipe@10 = gleam@result:map(
        _pipe@8,
        fun(Response) ->
            _pipe@9 = embeddings_from_json(erlang:element(4, Response)),
            gleam@result:map_error(
                _pipe@9,
                fun(E@1) -> {json_decode_error, E@1} end
            )
        end
    ),
    gleam@result:flatten(_pipe@10).