-module(gxid).
-compile(no_auto_import).

-export([string/1, time/1, machine_id/1, pid/1, random_number/1, start/0, generate/1, parse/1, to_xid/1]).
-export_type([message/0, state/0, xid/0, char_list/0]).

-opaque message() :: {generate, gleam@erlang@process:subject(xid())}.

-opaque state() :: {state, integer(), integer(), integer()}.

-opaque xid() :: {xid, integer(), integer(), integer(), integer(), binary()}.

-type char_list() :: any().

-spec string(xid()) -> binary().
string(Xid) ->
    erlang:element(6, Xid).

-spec time(xid()) -> integer().
time(Xid) ->
    erlang:element(2, Xid).

-spec machine_id(xid()) -> integer().
machine_id(Xid) ->
    erlang:element(3, Xid).

-spec pid(xid()) -> integer().
pid(Xid) ->
    erlang:element(4, Xid).

-spec random_number(xid()) -> integer().
random_number(Xid) ->
    erlang:element(5, Xid).

-spec start() -> {ok, gleam@erlang@process:subject(message())} |
    {error, gleam@otp@actor:start_error()}.
start() ->
    gleam@otp@actor:start(
        {state, find_machine_id(), find_pid(), gleam@int:random(0, 16777215)},
        fun handle/2
    ).

-spec generate(gleam@erlang@process:subject(message())) -> xid().
generate(Channel) ->
    gleam@otp@actor:call(Channel, fun(A) -> {generate, A} end, 1000).

-spec handle(message(), state()) -> gleam@otp@actor:next(state()).
handle(Msg, State) ->
    case Msg of
        {generate, Reply} ->
            gleam@otp@actor:send(
                Reply,
                begin
                    _pipe = [format_time(os:system_time(millisecond)),
                             format_machine_id(erlang:element(2, State)),
                             format_pid(erlang:element(3, State)),
                             format_random_number(erlang:element(4, State))],
                    _pipe@1 = gleam@bit_string:concat(_pipe),
                    to_xid(_pipe@1)
                end
            ),
            {continue,
             erlang:setelement(4, State, erlang:element(4, State) + 1)}
    end.

-spec format_time(integer()) -> bitstring().
format_time(Time) ->
    <<Time:32/big>>.

-spec format_machine_id(integer()) -> bitstring().
format_machine_id(Mid) ->
    <<Mid:24/big>>.

-spec format_pid(integer()) -> bitstring().
format_pid(Pid) ->
    <<Pid:16/big>>.

-spec format_random_number(integer()) -> bitstring().
format_random_number(Random_number) ->
    <<(gleam@bitwise:shift_left(Random_number, 8)):24/big>>.

-spec find_pid() -> integer().
find_pid() ->
    {ok, Pid@1} = case begin
        _pipe = os:getpid(),
        _pipe@1 = erlang:list_to_binary(_pipe),
        gleam@int:parse(_pipe@1)
    end of
        {ok, Pid} -> {ok, Pid};
        _try ->
            erlang:error(#{gleam_error => assert,
                           message => <<"Assertion pattern match failed"/utf8>>,
                           value => _try,
                           module => <<"gxid"/utf8>>,
                           function => <<"find_pid"/utf8>>,
                           line => 118})
    end,
    Pid@1.

-spec find_machine_id() -> integer().
find_machine_id() ->
    _pipe = net_adm:localhost(),
    gleam@list:fold(_pipe, 0, fun(Char, Acc) -> Char + Acc end).

-spec encode(bitstring()) -> binary().
encode(Bit_xid) ->
    <<B0, B1, B2, B3, B4, B5, B6, B7, B8, B9, B10, B11>> = <<Bit_xid/bitstring>>,
    Res = [encode_hex(gleam@bitwise:shift_right(B0, 3)),
           encode_hex(
               gleam@bitwise:'or'(
                   gleam@bitwise:'and'(gleam@bitwise:shift_right(B1, 6), 16#1F),
                   gleam@bitwise:'and'(gleam@bitwise:shift_left(B0, 2), 16#1F)
               )
           ),
           encode_hex(
               gleam@bitwise:'and'(gleam@bitwise:shift_right(B1, 1), 16#1F)
           ),
           encode_hex(
               gleam@bitwise:'or'(
                   gleam@bitwise:'and'(gleam@bitwise:shift_right(B2, 4), 16#1F),
                   gleam@bitwise:'and'(gleam@bitwise:shift_left(B1, 4), 16#1F)
               )
           ),
           encode_hex(
               gleam@bitwise:'or'(
                   gleam@bitwise:'and'(gleam@bitwise:shift_right(B3, 7), 16#1F),
                   gleam@bitwise:'and'(gleam@bitwise:shift_left(B2, 1), 16#1F)
               )
           ),
           encode_hex(
               gleam@bitwise:'and'(gleam@bitwise:shift_right(B3, 2), 16#1F)
           ),
           encode_hex(
               gleam@bitwise:'or'(
                   gleam@bitwise:'and'(gleam@bitwise:shift_right(B4, 5), 16#1F),
                   gleam@bitwise:'and'(gleam@bitwise:shift_left(B3, 3), 16#1F)
               )
           ),
           encode_hex(gleam@bitwise:'and'(B4, 16#1F)),
           encode_hex(gleam@bitwise:shift_right(B5, 3)),
           encode_hex(
               gleam@bitwise:'or'(
                   gleam@bitwise:'and'(gleam@bitwise:shift_right(B6, 6), 16#1F),
                   gleam@bitwise:'and'(gleam@bitwise:shift_left(B5, 2), 16#1F)
               )
           ),
           encode_hex(
               gleam@bitwise:'and'(gleam@bitwise:shift_right(B6, 1), 16#1F)
           ),
           encode_hex(
               gleam@bitwise:'or'(
                   gleam@bitwise:'and'(gleam@bitwise:shift_right(B7, 4), 16#1F),
                   gleam@bitwise:'and'(gleam@bitwise:shift_left(B6, 4), 16#1F)
               )
           ),
           encode_hex(
               gleam@bitwise:'or'(
                   gleam@bitwise:'and'(gleam@bitwise:shift_right(B8, 7), 16#1F),
                   gleam@bitwise:'and'(gleam@bitwise:shift_left(B7, 1), 16#1F)
               )
           ),
           encode_hex(
               gleam@bitwise:'and'(gleam@bitwise:shift_right(B8, 2), 16#1F)
           ),
           encode_hex(
               gleam@bitwise:'or'(
                   gleam@bitwise:'and'(gleam@bitwise:shift_right(B9, 5), 16#1F),
                   gleam@bitwise:'and'(gleam@bitwise:shift_left(B8, 3), 16#1F)
               )
           ),
           encode_hex(gleam@bitwise:'and'(B9, 16#1F)),
           encode_hex(gleam@bitwise:shift_right(B10, 3)),
           encode_hex(
               gleam@bitwise:'or'(
                   gleam@bitwise:'and'(gleam@bitwise:shift_right(B11, 6), 16#1F),
                   gleam@bitwise:'and'(gleam@bitwise:shift_left(B10, 2), 16#1F)
               )
           ),
           encode_hex(
               gleam@bitwise:'and'(gleam@bitwise:shift_right(B11, 1), 16#1F)
           ),
           encode_hex(
               gleam@bitwise:'and'(gleam@bitwise:shift_left(B11, 4), 16#1F)
           )],
    gleam@string:join(Res, <<""/utf8>>).

-spec encode_hex(integer()) -> binary().
encode_hex(I) ->
    case I of
        0 ->
            <<"0"/utf8>>;

        1 ->
            <<"1"/utf8>>;

        2 ->
            <<"2"/utf8>>;

        3 ->
            <<"3"/utf8>>;

        4 ->
            <<"4"/utf8>>;

        5 ->
            <<"5"/utf8>>;

        6 ->
            <<"6"/utf8>>;

        7 ->
            <<"7"/utf8>>;

        8 ->
            <<"8"/utf8>>;

        9 ->
            <<"9"/utf8>>;

        10 ->
            <<"a"/utf8>>;

        11 ->
            <<"b"/utf8>>;

        12 ->
            <<"c"/utf8>>;

        13 ->
            <<"d"/utf8>>;

        14 ->
            <<"e"/utf8>>;

        15 ->
            <<"f"/utf8>>;

        16 ->
            <<"g"/utf8>>;

        17 ->
            <<"h"/utf8>>;

        18 ->
            <<"i"/utf8>>;

        19 ->
            <<"j"/utf8>>;

        20 ->
            <<"k"/utf8>>;

        21 ->
            <<"l"/utf8>>;

        22 ->
            <<"m"/utf8>>;

        23 ->
            <<"n"/utf8>>;

        24 ->
            <<"o"/utf8>>;

        25 ->
            <<"p"/utf8>>;

        26 ->
            <<"q"/utf8>>;

        27 ->
            <<"r"/utf8>>;

        28 ->
            <<"s"/utf8>>;

        29 ->
            <<"t"/utf8>>;

        30 ->
            <<"u"/utf8>>;

        31 ->
            <<"v"/utf8>>
    end.

-spec parse(binary()) -> xid().
parse(Str_xid) ->
    _pipe = decode(Str_xid),
    to_xid(_pipe).

-spec to_xid(bitstring()) -> xid().
to_xid(Bit_xid) ->
    <<Time:32/big-unsigned,
      Mid:24/big-unsigned,
      Pid:16/big-unsigned,
      Rn1/big-unsigned,
      Rn2/big-unsigned,
      Rn3/big-unsigned>> = <<Bit_xid/bitstring>>,
    {xid,
     Time,
     Mid,
     Pid,
     gleam@bitwise:'or'(
         gleam@bitwise:'or'(
             gleam@bitwise:shift_left(Rn1, 16),
             gleam@bitwise:shift_left(Rn2, 8)
         ),
         Rn3
     ),
     encode(Bit_xid)}.

-spec decode(binary()) -> bitstring().
decode(Xid) ->
    [S0,
     S1,
     S2,
     S3,
     S4,
     S5,
     S6,
     S7,
     S8,
     S9,
     S10,
     S11,
     S12,
     S13,
     S14,
     S15,
     S16,
     S17,
     S18,
     S19] = begin
        _pipe = gleam@string:to_graphemes(Xid),
        gleam@list:map(_pipe, fun(X) -> decode_hex(X) end)
    end,
    <<(gleam@bitwise:'or'(
          gleam@bitwise:shift_left(S0, 3),
          gleam@bitwise:shift_right(S1, 2)
      )),
      (gleam@bitwise:'or'(
          gleam@bitwise:'or'(
              gleam@bitwise:shift_left(S1, 6),
              gleam@bitwise:shift_left(S2, 1)
          ),
          gleam@bitwise:shift_right(S3, 4)
      )),
      (gleam@bitwise:'or'(
          gleam@bitwise:shift_left(S3, 4),
          gleam@bitwise:shift_right(S4, 1)
      )),
      (gleam@bitwise:'or'(
          gleam@bitwise:'or'(
              gleam@bitwise:shift_left(S4, 7),
              gleam@bitwise:shift_left(S5, 2)
          ),
          gleam@bitwise:shift_right(S6, 3)
      )),
      (gleam@bitwise:'or'(gleam@bitwise:shift_left(S6, 5), S7)),
      (gleam@bitwise:'or'(
          gleam@bitwise:shift_left(S8, 3),
          gleam@bitwise:shift_right(S9, 2)
      )),
      (gleam@bitwise:'or'(
          gleam@bitwise:'or'(
              gleam@bitwise:shift_left(S9, 6),
              gleam@bitwise:shift_left(S10, 1)
          ),
          gleam@bitwise:shift_right(S11, 4)
      )),
      (gleam@bitwise:'or'(
          gleam@bitwise:shift_left(S11, 4),
          gleam@bitwise:shift_right(S12, 1)
      )),
      (gleam@bitwise:'or'(
          gleam@bitwise:'or'(
              gleam@bitwise:shift_left(S12, 7),
              gleam@bitwise:shift_left(S13, 2)
          ),
          gleam@bitwise:shift_right(S14, 3)
      )),
      (gleam@bitwise:'or'(gleam@bitwise:shift_left(S14, 5), S15)),
      (gleam@bitwise:'or'(
          gleam@bitwise:shift_left(S16, 3),
          gleam@bitwise:shift_right(S17, 2)
      )),
      (gleam@bitwise:'or'(
          gleam@bitwise:'or'(
              gleam@bitwise:shift_left(S17, 6),
              gleam@bitwise:shift_left(S18, 1)
          ),
          gleam@bitwise:shift_right(S19, 4)
      ))>>.

-spec decode_hex(binary()) -> integer().
decode_hex(S) ->
    case S of
        <<"0"/utf8>> ->
            0;

        <<"1"/utf8>> ->
            1;

        <<"2"/utf8>> ->
            2;

        <<"3"/utf8>> ->
            3;

        <<"4"/utf8>> ->
            4;

        <<"5"/utf8>> ->
            5;

        <<"6"/utf8>> ->
            6;

        <<"7"/utf8>> ->
            7;

        <<"8"/utf8>> ->
            8;

        <<"9"/utf8>> ->
            9;

        <<"a"/utf8>> ->
            10;

        <<"b"/utf8>> ->
            11;

        <<"c"/utf8>> ->
            12;

        <<"d"/utf8>> ->
            13;

        <<"e"/utf8>> ->
            14;

        <<"f"/utf8>> ->
            15;

        <<"g"/utf8>> ->
            16;

        <<"h"/utf8>> ->
            17;

        <<"i"/utf8>> ->
            18;

        <<"j"/utf8>> ->
            19;

        <<"k"/utf8>> ->
            20;

        <<"l"/utf8>> ->
            21;

        <<"m"/utf8>> ->
            22;

        <<"n"/utf8>> ->
            23;

        <<"o"/utf8>> ->
            24;

        <<"p"/utf8>> ->
            25;

        <<"q"/utf8>> ->
            26;

        <<"r"/utf8>> ->
            27;

        <<"s"/utf8>> ->
            28;

        <<"t"/utf8>> ->
            29;

        <<"u"/utf8>> ->
            30;

        <<"v"/utf8>> ->
            31
    end.