-module(bliss@dict_path_parser).
-compile(no_auto_import).

-export([parse/2]).
-export_type([error/0, response/0]).

-type error() :: not_enough_segments | {expected, binary()}.

-type response() :: {exact_match, gleam@map:map_(binary(), binary())} |
    {partial_match, gleam@map:map_(binary(), binary()), list(binary())}.

-spec do_parse(
    gleam@map:map_(binary(), binary()),
    list(binary()),
    list(binary())
) -> {ok, response()} | {error, error()}.
do_parse(Acc, Pattern_segments, Path_segments) ->
    case Pattern_segments of
        [] ->
            case gleam@list:is_empty(Path_segments) of
                true ->
                    {ok, {exact_match, Acc}};

                false ->
                    {ok, {partial_match, Acc, Path_segments}}
            end;

        [First_pattern | Rest_pattern] ->
            case Path_segments of
                [] ->
                    {error, not_enough_segments};

                [First_segment | Rest_path] ->
                    case gleam@string:starts_with(First_pattern, <<":"/utf8>>) of
                        true ->
                            Key = gleam@string:drop_left(First_pattern, 1),
                            Next_acc = begin
                                _pipe = Acc,
                                gleam@map:insert(_pipe, Key, First_segment)
                            end,
                            do_parse(Next_acc, Rest_pattern, Rest_path);

                        false ->
                            case First_pattern =:= First_segment of
                                true ->
                                    do_parse(Acc, Rest_pattern, Rest_path);

                                false ->
                                    {error, {expected, First_pattern}}
                            end
                    end
            end
    end.

-spec parse(binary(), binary()) -> {ok, response()} | {error, error()}.
parse(Pattern, Path) ->
    Pattern_segments = bliss@utils:segments(Pattern),
    Path_segments = bliss@utils:segments(Path),
    do_parse(gleam@map:new(), Pattern_segments, Path_segments).