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

-export([parse/2, parse_range/2, to_string/2]).

-spec split_seconds(binary(), binary()) -> {ok, {integer(), integer()}} |
    {error, nil}.
split_seconds(Input, Fraction_sep) ->
    case gleam@string:split(Input, Fraction_sep) of
        [_] ->
            gleam@result:'try'(
                gleam@int:parse(Input),
                fun(S) -> {ok, {S, 0}} end
            );

        [S@1, Ms] ->
            gleam@result:'try'(
                gleam@int:parse(S@1),
                fun(S@2) ->
                    gleam@result:'try'(
                        gleam@int:parse(Ms),
                        fun(Ms@1) -> {ok, {S@2, Ms@1}} end
                    )
                end
            );

        _ ->
            {error, nil}
    end.

-spec parse(binary(), binary()) -> {ok, integer()} | {error, nil}.
parse(Input, Fraction_sep) ->
    gleam@result:'try'((case gleam@string:split(Input, <<":"/utf8>>) of
            [M, S_ms] ->
                {ok, {<<"0"/utf8>>, M, S_ms}};

            [H, M@1, S_ms@1] ->
                {ok, {H, M@1, S_ms@1}};

            _ ->
                {error, nil}
        end), fun(_use0) ->
            {H@1, M@2, S_ms@2} = _use0,
            gleam@result:'try'(
                gleam@int:parse(H@1),
                fun(H@2) ->
                    gleam@result:'try'(
                        gleam@int:parse(M@2),
                        fun(M@3) ->
                            gleam@result:'try'(
                                split_seconds(S_ms@2, Fraction_sep),
                                fun(_use0@1) ->
                                    {S, Ms} = _use0@1,
                                    {ok,
                                        (((S + (M@3 * 60)) + ((H@2 * 60) * 60))
                                        * 1000)
                                        + Ms}
                                end
                            )
                        end
                    )
                end
            )
        end).

-spec parse_range(binary(), binary()) -> {ok, {integer(), integer(), binary()}} |
    {error, binary()}.
parse_range(Line, Fraction_sep) ->
    case gleam@string:split(Line, <<" --> "/utf8>>) of
        [Start, End_with_rest] ->
            gleam@result:'try'(
                begin
                    _pipe = Start,
                    _pipe@1 = parse(_pipe, Fraction_sep),
                    gleam@result:replace_error(
                        _pipe@1,
                        <<"Invalid start timestamp"/utf8>>
                    )
                end,
                fun(Start@1) ->
                    {End, Rest} = case gleam@string:split_once(
                        End_with_rest,
                        <<" "/utf8>>
                    ) of
                        {ok, Result} ->
                            Result;

                        {error, nil} ->
                            {End_with_rest, <<""/utf8>>}
                    end,
                    gleam@result:'try'(
                        begin
                            _pipe@2 = End,
                            _pipe@3 = parse(_pipe@2, Fraction_sep),
                            gleam@result:replace_error(
                                _pipe@3,
                                <<"Invalid end timestamp"/utf8>>
                            )
                        end,
                        fun(End@1) -> {ok, {Start@1, End@1, Rest}} end
                    )
                end
            );

        _ ->
            {error, <<"Invalid timestamp"/utf8>>}
    end.

-spec pad(integer(), integer()) -> binary().
pad(Number, Count) ->
    _pipe = Number,
    _pipe@1 = gleam@int:to_string(_pipe),
    gleam@string:pad_left(_pipe@1, Count, <<"0"/utf8>>).

-spec to_string(integer(), binary()) -> gleam@string_builder:string_builder().
to_string(Ms, Fraction_sep) ->
    Hours = pad((Ms div 3600000), 2),
    Minutes = pad(((Ms rem 3600000) div 60000), 2),
    Seconds = pad((Ms rem 60000) div 1000, 2),
    Ms@1 = pad(Ms rem 1000, 3),
    gleam@string_builder:from_strings(
        [Hours,
            <<":"/utf8>>,
            Minutes,
            <<":"/utf8>>,
            Seconds,
            Fraction_sep,
            Ms@1]
    ).