-module(bson@decoder).
-compile(no_auto_import).

-export([decode/1]).

-spec decode(bitstring()) -> {ok, list({binary(), bson@types:value()})} |
    {error, nil}.
decode(Data) ->
    case decode_document(Data) of
        {ok, {document, Doc}} ->
            {ok, Doc};

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

-spec decode_document(bitstring()) -> {ok, bson@types:value()} | {error, nil}.
decode_document(Data) ->
    Total_size = gleam@bit_string:byte_size(Data),
    Last_byte = gleam@bit_string:slice(Data, Total_size, -1),
    case Last_byte of
        {ok, <<0>>} ->
            <<Given_size:32/little-integer, Rest/bitstring>> = Data,
            case Total_size =:= Given_size of
                true ->
                    case gleam@bit_string:slice(Rest, 0, (Total_size - 4) - 1) of
                        {error, _try} -> {error, _try};
                        {ok, Body} ->
                            case decode_body(Body, []) of
                                {error, _try@1} -> {error, _try@1};
                                {ok, Body@1} ->
                                    _pipe = Body@1,
                                    _pipe@1 = {document, _pipe},
                                    {ok, _pipe@1}
                            end
                    end;

                false ->
                    {error, nil}
            end;

        _@1 ->
            {error, nil}
    end.

-spec decode_body(bitstring(), list({binary(), bson@types:value()})) -> {ok,
        list({binary(), bson@types:value()})} |
    {error, nil}.
decode_body(Data, Storage) ->
    case gleam@bit_string:byte_size(Data) of
        0 ->
            {ok, Storage};

        _@1 ->
            <<Code:8, Data@1/bitstring>> = Data,
            Total_size = gleam@bit_string:byte_size(Data@1),
            case consume_till_zero(Data@1, <<>>) of
                {error, _try} -> {error, _try};
                {ok, Key} ->
                    Key_size = gleam@bit_string:byte_size(Key),
                    case gleam@bit_string:to_string(Key) of
                        {error, _try@1} -> {error, _try@1};
                        {ok, Key@1} ->
                            case gleam@bit_string:slice(
                                Data@1,
                                Key_size
                                + 1,
                                (Total_size
                                - Key_size)
                                - 1
                            ) of
                                {error, _try@2} -> {error, _try@2};
                                {ok, Rest} ->
                                    Kind = {kind, <<Code>>},
                                    case Kind of
                                        Kind@1 when Kind@1 =:= {kind, <<16#05>>} ->
                                            <<Byte_size:32/little-integer,
                                                Sub_code:8,
                                                Rest@1/bitstring>> = Rest,
                                            Given_size = Byte_size * 8,
                                            <<Value:Given_size/bitstring,
                                                Rest@2/bitstring>> = Rest@1,
                                            Sub_kind = {sub_kind, <<Sub_code>>},
                                            case Sub_kind of
                                                Sub_kind@1 when Sub_kind@1 =:= {sub_kind,
                                                    <<16#0>>} ->
                                                    case bson@generic:from_bit_string(
                                                        Value
                                                    ) of
                                                        {error, _try@3} -> {error, _try@3};
                                                        {ok, Value@1} ->
                                                            recurse_with_new_kv(
                                                                Rest@2,
                                                                Storage,
                                                                Key@1,
                                                                begin
                                                                    _pipe = Value@1,
                                                                    _pipe@1 = {generic,
                                                                        _pipe},
                                                                    {binary,
                                                                        _pipe@1}
                                                                end
                                                            )
                                                    end;

                                                Sub_kind@2 when Sub_kind@2 =:= {sub_kind,
                                                    <<16#5>>} ->
                                                    case bson@md5:from_bit_string(
                                                        Value
                                                    ) of
                                                        {error, _try@4} -> {error, _try@4};
                                                        {ok, Value@2} ->
                                                            recurse_with_new_kv(
                                                                Rest@2,
                                                                Storage,
                                                                Key@1,
                                                                begin
                                                                    _pipe@2 = Value@2,
                                                                    _pipe@3 = {md5,
                                                                        _pipe@2},
                                                                    {binary,
                                                                        _pipe@3}
                                                                end
                                                            )
                                                    end;

                                                Sub_kind@3 when Sub_kind@3 =:= {sub_kind,
                                                    <<16#4>>} ->
                                                    case bson@uuid:from_bit_string(
                                                        Value
                                                    ) of
                                                        {error, _try@5} -> {error, _try@5};
                                                        {ok, Value@3} ->
                                                            recurse_with_new_kv(
                                                                Rest@2,
                                                                Storage,
                                                                Key@1,
                                                                begin
                                                                    _pipe@4 = Value@3,
                                                                    _pipe@5 = {uuid,
                                                                        _pipe@4},
                                                                    {binary,
                                                                        _pipe@5}
                                                                end
                                                            )
                                                    end;

                                                _@2 when Sub_code >= 16#80 ->
                                                    case bson@custom:from_bit_string_with_code(
                                                        Sub_code,
                                                        Value
                                                    ) of
                                                        {error, _try@6} -> {error, _try@6};
                                                        {ok, Value@4} ->
                                                            recurse_with_new_kv(
                                                                Rest@2,
                                                                Storage,
                                                                Key@1,
                                                                begin
                                                                    _pipe@6 = Value@4,
                                                                    _pipe@7 = {custom,
                                                                        _pipe@6},
                                                                    {binary,
                                                                        _pipe@7}
                                                                end
                                                            )
                                                    end;

                                                _@3 ->
                                                    {error, nil}
                                            end;

                                        Kind@2 when Kind@2 =:= {kind, <<16#01>>} ->
                                            <<Value@5/little-float,
                                                Rest@3/bitstring>> = Rest,
                                            recurse_with_new_kv(
                                                Rest@3,
                                                Storage,
                                                Key@1,
                                                {double, Value@5}
                                            );

                                        Kind@3 when Kind@3 =:= {kind, <<16#07>>} ->
                                            <<Value@6:96/bitstring,
                                                Rest@4/bitstring>> = Rest,
                                            case bson@object_id:from_bit_string(
                                                Value@6
                                            ) of
                                                {error, _try@7} -> {error, _try@7};
                                                {ok, Oid} ->
                                                    recurse_with_new_kv(
                                                        Rest@4,
                                                        Storage,
                                                        Key@1,
                                                        {object_id, Oid}
                                                    )
                                            end;

                                        Kind@4 when Kind@4 =:= {kind, <<16#08>>} ->
                                            <<Value@7:8, Rest@5/bitstring>> = Rest,
                                            decode_boolean(
                                                Value@7,
                                                fun(Value@8) ->
                                                    recurse_with_new_kv(
                                                        Rest@5,
                                                        Storage,
                                                        Key@1,
                                                        {boolean, Value@8}
                                                    )
                                                end
                                            );

                                        Kind@5 when Kind@5 =:= {kind, <<16#0A>>} ->
                                            recurse_with_new_kv(
                                                Rest,
                                                Storage,
                                                Key@1,
                                                null
                                            );

                                        Kind@6 when Kind@6 =:= {kind, <<16#FF>>} ->
                                            recurse_with_new_kv(
                                                Rest,
                                                Storage,
                                                Key@1,
                                                min
                                            );

                                        Kind@7 when Kind@7 =:= {kind, <<16#7F>>} ->
                                            recurse_with_new_kv(
                                                Rest,
                                                Storage,
                                                Key@1,
                                                max
                                            );

                                        Kind@8 when Kind@8 =:= {kind, <<16#10>>} ->
                                            <<Value@9:32/little,
                                                Rest@6/bitstring>> = Rest,
                                            recurse_with_new_kv(
                                                Rest@6,
                                                Storage,
                                                Key@1,
                                                {integer, Value@9}
                                            );

                                        Kind@9 when Kind@9 =:= {kind, <<16#12>>} ->
                                            <<Value@10:64/little,
                                                Rest@7/bitstring>> = Rest,
                                            recurse_with_new_kv(
                                                Rest@7,
                                                Storage,
                                                Key@1,
                                                {integer, Value@10}
                                            );

                                        Kind@10 when Kind@10 =:= {kind,
                                            <<16#09>>} ->
                                            <<Value@11:64/little,
                                                Rest@8/bitstring>> = Rest,
                                            recurse_with_new_kv(
                                                Rest@8,
                                                Storage,
                                                Key@1,
                                                {date_time, Value@11}
                                            );

                                        Kind@11 when Kind@11 =:= {kind,
                                            <<16#11>>} ->
                                            <<Value@12:64/little-unsigned,
                                                Rest@9/bitstring>> = Rest,
                                            recurse_with_new_kv(
                                                Rest@9,
                                                Storage,
                                                Key@1,
                                                {timestamp, Value@12}
                                            );

                                        Kind@12 when Kind@12 =:= {kind,
                                            <<16#0B>>} ->
                                            case consume_till_zero(Rest, <<>>) of
                                                {error, _try@8} -> {error, _try@8};
                                                {ok, Pattern_bytes} ->
                                                    Pattern_size = (gleam@bit_string:byte_size(
                                                        Pattern_bytes
                                                    )
                                                    + 1)
                                                    * 8,
                                                    <<_@4:Pattern_size,
                                                        Rest@10/bitstring>> = Rest,
                                                    case consume_till_zero(
                                                        Rest@10,
                                                        <<>>
                                                    ) of
                                                        {error, _try@9} -> {error, _try@9};
                                                        {ok, Options_bytes} ->
                                                            Options_size = (gleam@bit_string:byte_size(
                                                                Options_bytes
                                                            )
                                                            + 1)
                                                            * 8,
                                                            <<_@5:Options_size,
                                                                Rest@11/bitstring>> = Rest@10,
                                                            case gleam@bit_string:to_string(
                                                                Pattern_bytes
                                                            ) of
                                                                {error, _try@10} -> {error, _try@10};
                                                                {ok, Pattern} ->
                                                                    case gleam@bit_string:to_string(
                                                                        Options_bytes
                                                                    ) of
                                                                        {error, _try@11} -> {error, _try@11};
                                                                        {ok, Options} ->
                                                                            recurse_with_new_kv(
                                                                                Rest@11,
                                                                                Storage,
                                                                                Key@1,
                                                                                {regex,
                                                                                    {Pattern,
                                                                                        Options}}
                                                                            )
                                                                    end
                                                            end
                                                    end
                                            end;

                                        Kind@13 when Kind@13 =:= {kind,
                                            <<16#02>>} ->
                                            <<Given_size@1:32/little-integer,
                                                Rest@12/bitstring>> = Rest,
                                            case consume_till_zero(
                                                Rest@12,
                                                <<>>
                                            ) of
                                                {error, _try@12} -> {error, _try@12};
                                                {ok, Str} ->
                                                    Str_size = gleam@bit_string:byte_size(
                                                        Str
                                                    ),
                                                    case Given_size@1
                                                    =:= (Str_size
                                                    + 1) of
                                                        true ->
                                                            case gleam@bit_string:to_string(
                                                                Str
                                                            ) of
                                                                {error, _try@13} -> {error, _try@13};
                                                                {ok, Str@1} ->
                                                                    case gleam@bit_string:slice(
                                                                        Rest@12,
                                                                        Str_size
                                                                        + 1,
                                                                        (gleam@bit_string:byte_size(
                                                                            Rest@12
                                                                        )
                                                                        - Str_size)
                                                                        - 1
                                                                    ) of
                                                                        {error, _try@14} -> {error, _try@14};
                                                                        {ok, Rest@13} ->
                                                                            recurse_with_new_kv(
                                                                                Rest@13,
                                                                                Storage,
                                                                                Key@1,
                                                                                {str,
                                                                                    Str@1}
                                                                            )
                                                                    end
                                                            end;

                                                        false ->
                                                            {error, nil}
                                                    end
                                            end;

                                        Kind@14 when Kind@14 =:= {kind,
                                            <<16#0D>>} ->
                                            <<Given_size@2:32/little-integer,
                                                Rest@14/bitstring>> = Rest,
                                            case consume_till_zero(
                                                Rest@14,
                                                <<>>
                                            ) of
                                                {error, _try@15} -> {error, _try@15};
                                                {ok, Str@2} ->
                                                    Str_size@1 = gleam@bit_string:byte_size(
                                                        Str@2
                                                    ),
                                                    case Given_size@2
                                                    =:= (Str_size@1
                                                    + 1) of
                                                        true ->
                                                            case gleam@bit_string:to_string(
                                                                Str@2
                                                            ) of
                                                                {error, _try@16} -> {error, _try@16};
                                                                {ok, Str@3} ->
                                                                    case gleam@bit_string:slice(
                                                                        Rest@14,
                                                                        Str_size@1
                                                                        + 1,
                                                                        (gleam@bit_string:byte_size(
                                                                            Rest@14
                                                                        )
                                                                        - Str_size@1)
                                                                        - 1
                                                                    ) of
                                                                        {error, _try@17} -> {error, _try@17};
                                                                        {ok, Rest@15} ->
                                                                            recurse_with_new_kv(
                                                                                Rest@15,
                                                                                Storage,
                                                                                Key@1,
                                                                                {js,
                                                                                    Str@3}
                                                                            )
                                                                    end
                                                            end;

                                                        false ->
                                                            {error, nil}
                                                    end
                                            end;

                                        Kind@15 when (Kind@15 =:= {kind,
                                            <<16#03>>}) orelse (Kind@15 =:= {kind,
                                            <<16#04>>}) ->
                                            <<Doc_size:32/little-integer,
                                                _@6/bitstring>> = Rest,
                                            case gleam@bit_string:slice(
                                                Rest,
                                                0,
                                                Doc_size
                                            ) of
                                                {error, _try@18} -> {error, _try@18};
                                                {ok, Doc} ->
                                                    case decode_document(Doc) of
                                                        {error, _try@19} -> {error, _try@19};
                                                        {ok, {document, Doc@1}} ->
                                                            case case Kind@15 of
                                                                Kind@16 when Kind@16 =:= {kind,
                                                                    <<16#03>>} ->
                                                                    _pipe@8 = Doc@1,
                                                                    _pipe@9 = {document,
                                                                        _pipe@8},
                                                                    {ok,
                                                                        _pipe@9};

                                                                Kind@17 when Kind@17 =:= {kind,
                                                                    <<16#04>>} ->
                                                                    case gleam@list:try_map(
                                                                        Doc@1,
                                                                        fun(
                                                                            Item
                                                                        ) ->
                                                                            case gleam@int:parse(
                                                                                erlang:element(
                                                                                    1,
                                                                                    Item
                                                                                )
                                                                            ) of
                                                                                {error, _try@20} -> {error, _try@20};
                                                                                {ok, First} ->
                                                                                    {ok,
                                                                                        {First,
                                                                                            erlang:element(
                                                                                                2,
                                                                                                Item
                                                                                            )}}
                                                                            end
                                                                        end
                                                                    ) of
                                                                        {error, _try@21} -> {error, _try@21};
                                                                        {ok, Doc@2} ->
                                                                            _pipe@10 = Doc@2,
                                                                            _pipe@11 = gleam@list:sort(
                                                                                _pipe@10,
                                                                                fun(
                                                                                    A,
                                                                                    B
                                                                                ) ->
                                                                                    gleam@int:compare(
                                                                                        erlang:element(
                                                                                            1,
                                                                                            A
                                                                                        ),
                                                                                        erlang:element(
                                                                                            1,
                                                                                            B
                                                                                        )
                                                                                    )
                                                                                end
                                                                            ),
                                                                            _pipe@12 = gleam@list:map(
                                                                                _pipe@11,
                                                                                fun gleam@pair:second/1
                                                                            ),
                                                                            _pipe@13 = {array,
                                                                                _pipe@12},
                                                                            {ok,
                                                                                _pipe@13}
                                                                    end;

                                                                _@7 ->
                                                                    {error, nil}
                                                            end of
                                                                {error, _try@22} -> {error, _try@22};
                                                                {ok, Doc@3} ->
                                                                    case gleam@bit_string:slice(
                                                                        Rest,
                                                                        Doc_size,
                                                                        gleam@bit_string:byte_size(
                                                                            Rest
                                                                        )
                                                                        - Doc_size
                                                                    ) of
                                                                        {ok,
                                                                            Rest@16} ->
                                                                            recurse_with_new_kv(
                                                                                Rest@16,
                                                                                Storage,
                                                                                Key@1,
                                                                                Doc@3
                                                                            );

                                                                        {error,
                                                                            nil} ->
                                                                            {error,
                                                                                nil}
                                                                    end
                                                            end
                                                    end
                                            end;

                                        _@8 ->
                                            {error, nil}
                                    end
                            end
                    end
            end
    end.

-spec consume_till_zero(bitstring(), bitstring()) -> {ok, bitstring()} |
    {error, nil}.
consume_till_zero(Data, Storage) ->
    case gleam@bit_string:byte_size(Data) of
        0 ->
            {error, nil};

        _@1 ->
            <<Ch:8, Rest/bitstring>> = Data,
            case Ch of
                0 ->
                    {ok, Storage};

                _@2 ->
                    consume_till_zero(
                        Rest,
                        gleam@bit_string:append(Storage, <<Ch>>)
                    )
            end
    end.

-spec recurse_with_new_kv(
    bitstring(),
    list({binary(), bson@types:value()}),
    binary(),
    bson@types:value()
) -> {ok, list({binary(), bson@types:value()})} | {error, nil}.
recurse_with_new_kv(Rest, Storage, Key, Value) ->
    decode_body(Rest, gleam@list:key_set(Storage, Key, Value)).

-spec decode_boolean(
    integer(),
    fun((boolean()) -> {ok, list({binary(), bson@types:value()})} | {error, nil})
) -> {ok, list({binary(), bson@types:value()})} | {error, nil}.
decode_boolean(Value, Rest) ->
    case Value of
        0 ->
            Rest(false);

        1 ->
            Rest(true);

        _@1 ->
            {error, nil}
    end.