-module(glats@internal@decoder).
-compile([no_auto_import, nowarn_unused_vars]).

-export([headers/1, reply_to/1, decode_msg/1, decode_mandatory_server_info/1, decode_optional_server_info/1, decode_server_info/1]).
-export_type([mandatory_fields/0, optional_fields/0]).

-type mandatory_fields() :: {mandatory_fields,
        binary(),
        binary(),
        binary(),
        binary(),
        binary(),
        integer(),
        boolean(),
        integer(),
        integer()}.

-type optional_fields() :: {optional_fields,
        boolean(),
        gleam@option:option(boolean())}.

-spec atom_field(
    binary(),
    fun((gleam@dynamic:dynamic()) -> {ok, GHX} |
        {error, list(gleam@dynamic:decode_error())})
) -> fun((gleam@dynamic:dynamic()) -> {ok, GHX} |
    {error, list(gleam@dynamic:decode_error())}).
atom_field(Key, Value) ->
    gleam@dynamic:field(erlang:binary_to_atom(Key), Value).

-spec headers(gleam@dynamic:dynamic()) -> {ok,
        gleam@map:map_(binary(), binary())} |
    {error, list(gleam@dynamic:decode_error())}.
headers(Data) ->
    _pipe = Data,
    _pipe@1 = (atom_field(
        <<"headers"/utf8>>,
        gleam@dynamic:list(
            gleam@dynamic:tuple2(
                fun gleam@dynamic:string/1,
                fun gleam@dynamic:string/1
            )
        )
    ))(_pipe),
    _pipe@2 = gleam@result:map(_pipe@1, fun gleam@map:from_list/1),
    gleam@result:'or'(_pipe@2, {ok, gleam@map:new()}).

-spec reply_to(gleam@dynamic:dynamic()) -> {ok, gleam@option:option(binary())} |
    {error, list(gleam@dynamic:decode_error())}.
reply_to(Data) ->
    _pipe = Data,
    _pipe@1 = (gleam@dynamic:optional(
        atom_field(<<"reply_to"/utf8>>, fun gleam@dynamic:string/1)
    ))(_pipe),
    gleam@result:'or'(_pipe@1, {ok, none}).

-spec decode_msg(gleam@dynamic:dynamic()) -> {ok, glats@message:message()} |
    {error, list(gleam@dynamic:decode_error())}.
decode_msg(Data) ->
    _pipe = Data,
    (gleam@dynamic:decode4(
        fun(Field@0, Field@1, Field@2, Field@3) -> {message, Field@0, Field@1, Field@2, Field@3} end,
        atom_field(<<"topic"/utf8>>, fun gleam@dynamic:string/1),
        fun headers/1,
        fun reply_to/1,
        atom_field(<<"body"/utf8>>, fun gleam@dynamic:string/1)
    ))(_pipe).

-spec decode_mandatory_server_info(gleam@dynamic:dynamic()) -> {ok,
        mandatory_fields()} |
    {error, list(gleam@dynamic:decode_error())}.
decode_mandatory_server_info(Data) ->
    _pipe = Data,
    (gleam@dynamic:decode9(
        fun(Field@0, Field@1, Field@2, Field@3, Field@4, Field@5, Field@6, Field@7, Field@8) -> {mandatory_fields, Field@0, Field@1, Field@2, Field@3, Field@4, Field@5, Field@6, Field@7, Field@8} end,
        atom_field(<<"server_id"/utf8>>, fun gleam@dynamic:string/1),
        atom_field(<<"server_name"/utf8>>, fun gleam@dynamic:string/1),
        atom_field(<<"version"/utf8>>, fun gleam@dynamic:string/1),
        atom_field(<<"go"/utf8>>, fun gleam@dynamic:string/1),
        atom_field(<<"host"/utf8>>, fun gleam@dynamic:string/1),
        atom_field(<<"port"/utf8>>, fun gleam@dynamic:int/1),
        atom_field(<<"headers"/utf8>>, fun gleam@dynamic:bool/1),
        atom_field(<<"max_payload"/utf8>>, fun gleam@dynamic:int/1),
        atom_field(<<"proto"/utf8>>, fun gleam@dynamic:int/1)
    ))(_pipe).

-spec jetstream(gleam@dynamic:dynamic()) -> {ok, boolean()} |
    {error, list(gleam@dynamic:decode_error())}.
jetstream(Data) ->
    _pipe = Data,
    _pipe@1 = (atom_field(<<"jetstream"/utf8>>, fun gleam@dynamic:bool/1))(
        _pipe
    ),
    gleam@result:'or'(_pipe@1, {ok, false}).

-spec optional_field(
    binary(),
    fun((gleam@dynamic:dynamic()) -> {ok, GKG} |
        {error, list(gleam@dynamic:decode_error())})
) -> fun((gleam@dynamic:dynamic()) -> {ok, gleam@option:option(GKG)} |
    {error, list(gleam@dynamic:decode_error())}).
optional_field(Key, Value) ->
    fun(Data) ->
        _pipe = Data,
        _pipe@1 = (gleam@dynamic:optional(atom_field(Key, Value)))(_pipe),
        gleam@result:'or'(_pipe@1, {ok, none})
    end.

-spec decode_optional_server_info(gleam@dynamic:dynamic()) -> {ok,
        optional_fields()} |
    {error, list(gleam@dynamic:decode_error())}.
decode_optional_server_info(Data) ->
    _pipe = Data,
    (gleam@dynamic:decode2(
        fun(Field@0, Field@1) -> {optional_fields, Field@0, Field@1} end,
        fun jetstream/1,
        optional_field(<<"auth_required"/utf8>>, fun gleam@dynamic:bool/1)
    ))(_pipe).

-spec decode_server_info(gleam@dynamic:dynamic()) -> {ok,
        glats@protocol:server_info()} |
    {error, list(gleam@dynamic:decode_error())}.
decode_server_info(Data) ->
    gleam@result:then(
        decode_mandatory_server_info(Data),
        fun(Mandatory) ->
            gleam@result:then(
                decode_optional_server_info(Data),
                fun(Optional) ->
                    {ok,
                        {server_info,
                            erlang:element(2, Mandatory),
                            erlang:element(3, Mandatory),
                            erlang:element(4, Mandatory),
                            erlang:element(5, Mandatory),
                            erlang:element(6, Mandatory),
                            erlang:element(7, Mandatory),
                            erlang:element(8, Mandatory),
                            erlang:element(9, Mandatory),
                            erlang:element(10, Mandatory),
                            erlang:element(2, Optional),
                            erlang:element(3, Optional)}}
                end
            )
        end
    ).