-module(internal@serializer).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([get_json_serializer_str/1, from/1]).

-spec glance_t_to_codegen_t(glance:type()) -> internal@codegen@types:gleam_type().
glance_t_to_codegen_t(X) ->
    case X of
        {named_type, Name, _, Parameters} ->
            case Name of
                <<"List"/utf8>> ->
                    _assert_subject = gleam@list:at(Parameters, 0),
                    {ok, T0} = 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 => <<"internal/serializer"/utf8>>,
                                        function => <<"glance_t_to_codegen_t"/utf8>>,
                                        line => 19})
                    end,
                    {list_type, glance_t_to_codegen_t(T0)};

                <<"Option"/utf8>> ->
                    _assert_subject@1 = gleam@list:at(Parameters, 0),
                    {ok, T0@1} = case _assert_subject@1 of
                        {ok, _} -> _assert_subject@1;
                        _assert_fail@1 ->
                            erlang:error(#{gleam_error => let_assert,
                                        message => <<"Assertion pattern match failed"/utf8>>,
                                        value => _assert_fail@1,
                                        module => <<"internal/serializer"/utf8>>,
                                        function => <<"glance_t_to_codegen_t"/utf8>>,
                                        line => 25})
                    end,
                    internal@codegen@types:option(glance_t_to_codegen_t(T0@1));

                <<"Result"/utf8>> ->
                    erlang:error(#{gleam_error => panic,
                            message => <<"Result is unimplemented! serde-style tagging support needed https://serde.rs/enum-representations.html"/utf8>>,
                            module => <<"internal/serializer"/utf8>>,
                            function => <<"glance_t_to_codegen_t"/utf8>>,
                            line => 31});

                _ ->
                    {anonymous_type, Name}
            end;

        {tuple_type, Elements} ->
            {tuple_type, gleam@list:map(Elements, fun glance_t_to_codegen_t/1)};

        {function_type, _, _} ->
            erlang:error(#{gleam_error => panic,
                    message => <<"cannot serialize entities with functions"/utf8>>,
                    module => <<"internal/serializer"/utf8>>,
                    function => <<"glance_t_to_codegen_t"/utf8>>,
                    line => 41});

        {variable_type, _} ->
            erlang:error(#{gleam_error => panic,
                    message => <<"unimplemented! VariableType"/utf8>>,
                    module => <<"internal/serializer"/utf8>>,
                    function => <<"glance_t_to_codegen_t"/utf8>>,
                    line => 46})
    end.

-spec get_json_serializer_str(internal@codegen@types:gleam_type()) -> binary().
get_json_serializer_str(Ct) ->
    case Ct of
        {anonymous_type, Name} ->
            <<"json."/utf8, (gleam@string:lowercase(Name))/binary>>;

        {tuple_type, _} ->
            <<"json.preprocessed_array"/utf8>>;

        {list_type, _} ->
            <<"json.array"/utf8>>;

        {variant_dep_type, Name@1, _, _} ->
            case Name@1 of
                <<"Option"/utf8>> ->
                    <<"json.nullable"/utf8>>;

                _ ->
                    <<(erlang:error(#{gleam_error => panic,
                                message => <<"VariantDefType not supported: "/utf8>>,
                                module => <<"internal/serializer"/utf8>>,
                                function => <<"get_json_serializer_str"/utf8>>,
                                line => 64}))/binary, Name@1/binary>>
            end;

        _ ->
            erlang:error(#{gleam_error => todo,
                    message => <<"This has not yet been implemented"/utf8>>,
                    module => <<"internal/serializer"/utf8>>,
                    function => <<"get_json_serializer_str"/utf8>>,
                    line => 70})
    end.

-spec codegen_t_to_codegen_json_t(internal@codegen@types:gleam_type(), binary()) -> internal@codegen@statements:gleam_statement().
codegen_t_to_codegen_json_t(Ct, Field_name) ->
    Json_call_fn_str = get_json_serializer_str(Ct),
    Field_name_var = {var_primitive, <<"t."/utf8, Field_name/binary>>},
    case Ct of
        {anonymous_type, _} ->
            internal@codegen@statements:call(Json_call_fn_str, [Field_name_var]);

        {tuple_type, Els} ->
            internal@codegen@statements:call(
                Json_call_fn_str,
                [internal@codegen@statements:list(
                        gleam@list:index_map(
                            Els,
                            fun(El, I) ->
                                codegen_t_to_codegen_json_t(
                                    El,
                                    <<<<Field_name/binary, "."/utf8>>/binary,
                                        (gleam@int:to_string(I))/binary>>
                                )
                            end
                        )
                    )]
            );

        {list_type, Inner} ->
            internal@codegen@statements:call(
                Json_call_fn_str,
                [Field_name_var,
                    {var_primitive, get_json_serializer_str(Inner)}]
            );

        {variant_dep_type, _, Dep_types, _} ->
            internal@codegen@statements:call(
                Json_call_fn_str,
                [Field_name_var |
                    gleam@list:map(
                        Dep_types,
                        fun(Inner@1) ->
                            {var_primitive, get_json_serializer_str(Inner@1)}
                        end
                    )]
            );

        _ ->
            erlang:error(#{gleam_error => todo,
                    message => <<"This has not yet been implemented"/utf8>>,
                    module => <<"internal/serializer"/utf8>>,
                    function => <<"codegen_t_to_codegen_json_t"/utf8>>,
                    line => 109})
    end.

-spec serializer_of_t(glance:type(), binary()) -> internal@codegen@statements:gleam_statement().
serializer_of_t(X, Field_name) ->
    Ct = glance_t_to_codegen_t(X),
    codegen_t_to_codegen_json_t(Ct, Field_name).

-spec gen_to_json(request:request()) -> internal@codegen@statements:gleam_statement().
gen_to_json(Req) ->
    {request, Src_module_name, Type_name, Variant, _, _} = Req,
    {function,
        <<"to_json"/utf8>>,
        [internal@codegen@statements:arg_typed(
                <<"t"/utf8>>,
                {anonymous_type,
                    <<<<(internal@path:basename(Src_module_name))/binary,
                            "."/utf8>>/binary,
                        Type_name/binary>>}
            )],
        [internal@codegen@statements:call(
                <<"json.object"/utf8>>,
                [internal@codegen@statements:list(
                        gleam@list:map(
                            erlang:element(3, Variant),
                            fun(Field) ->
                                case gleam@option:to_result(
                                    erlang:element(2, Field),
                                    nil
                                ) of
                                    {ok, Label} ->
                                        {tuple_val,
                                            [{string_val, Label},
                                                serializer_of_t(
                                                    erlang:element(3, Field),
                                                    Label
                                                )]};

                                    _ ->
                                        gleam@io:println_error(
                                            <<<<"Variant "/utf8,
                                                    (erlang:element(2, Variant))/binary>>/binary,
                                                " must have labels for all fields"/utf8>>
                                        ),
                                        erlang:error(#{gleam_error => panic,
                                                message => <<"missing label"/utf8>>,
                                                module => <<"internal/serializer"/utf8>>,
                                                function => <<"gen_to_json"/utf8>>,
                                                line => 154})
                                end
                            end
                        )
                    )]
            )]}.

-spec gen_to_string(request:request()) -> internal@codegen@statements:gleam_statement().
gen_to_string(Req) ->
    {request, Src_module_name, Type_name, _, _, _} = Req,
    {function,
        <<"to_string"/utf8>>,
        [internal@codegen@statements:arg_typed(
                <<"t"/utf8>>,
                {anonymous_type,
                    <<<<(internal@path:basename(Src_module_name))/binary,
                            "."/utf8>>/binary,
                        Type_name/binary>>}
            )],
        [internal@codegen@statements:call(
                <<"json.to_string"/utf8>>,
                [internal@codegen@statements:call(
                        <<"to_json"/utf8>>,
                        [internal@codegen@statements:variable(<<"t"/utf8>>)]
                    )]
            )]}.

-spec from(request:request()) -> binary().
from(Req) ->
    _pipe = [gen_to_json(Req), gen_to_string(Req)],
    _pipe@1 = gleam@list:map(_pipe, fun internal@codegen@statements:generate/1),
    gleam@string:join(_pipe@1, <<"\n"/utf8>>).