-module(jackson@internal@resolver).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([resolve/2]).
-export_type([ref/0]).

-type ref() :: {root, boolean(), gleam@option:option(ref())} |
    {ref, binary(), gleam@option:option(ref())}.

-spec ref_loop(list(binary())) -> gleam@option:option(ref()).
ref_loop(Path_items) ->
    case Path_items of
        [] ->
            none;

        [First | Rest] ->
            {some, {ref, First, ref_loop(Rest)}}
    end.

-spec parse_ref(binary()) -> ref().
parse_ref(Ref) ->
    {First, Split} = begin
        _pipe = gleam@string:split(Ref, <<"/"/utf8>>),
        gleam@list:split(_pipe, 1)
    end,
    [Fragment_ident] = case First of
        [_] -> First;
        _assert_fail ->
            erlang:error(#{gleam_error => let_assert,
                        message => <<"Assertion pattern match failed"/utf8>>,
                        value => _assert_fail,
                        module => <<"jackson/internal/resolver"/utf8>>,
                        function => <<"parse_ref"/utf8>>,
                        line => 87})
    end,
    Fragment_ident_enabled = Fragment_ident =:= <<"#"/utf8>>,
    Descaped = begin
        _pipe@1 = gleam@list:map(
            Split,
            fun(_capture) ->
                gleam@string:replace(_capture, <<"~1"/utf8>>, <<"/"/utf8>>)
            end
        ),
        gleam@list:map(
            _pipe@1,
            fun(_capture@1) ->
                gleam@string:replace(_capture@1, <<"~0"/utf8>>, <<"~"/utf8>>)
            end
        )
    end,
    {root, Fragment_ident_enabled, ref_loop(Descaped)}.

-spec resolve_array_ref(list(jackson@internal@json:json()), ref()) -> {ok,
        jackson@internal@json:json()} |
    {error, nil}.
resolve_array_ref(Entries, Ref) ->
    {ref, Value, Next} = case Ref of
        {ref, _, _} -> Ref;
        _assert_fail ->
            erlang:error(#{gleam_error => let_assert,
                        message => <<"Assertion pattern match failed"/utf8>>,
                        value => _assert_fail,
                        module => <<"jackson/internal/resolver"/utf8>>,
                        function => <<"resolve_array_ref"/utf8>>,
                        line => 33})
    end,
    _assert_subject = gleam@regex:from_string(<<"^(-|([1-9][0-9]+))$"/utf8>>),
    {ok, Re} = case _assert_subject of
        {ok, _} -> _assert_subject;
        _assert_fail@1 ->
            erlang:error(#{gleam_error => let_assert,
                        message => <<"Assertion pattern match failed"/utf8>>,
                        value => _assert_fail@1,
                        module => <<"jackson/internal/resolver"/utf8>>,
                        function => <<"resolve_array_ref"/utf8>>,
                        line => 34})
    end,
    Is_valid_array_path = gleam@regex:check(Re, Value),
    gleam@bool:guard(
        not Is_valid_array_path,
        {error, nil},
        fun() ->
            Indexed_item = case Value of
                <<"-"/utf8>> ->
                    {error, nil};

                Idx ->
                    _assert_subject@1 = gleam@int:parse(Idx),
                    {ok, Idx@1} = case _assert_subject@1 of
                        {ok, _} -> _assert_subject@1;
                        _assert_fail@2 ->
                            erlang:error(#{gleam_error => let_assert,
                                        message => <<"Assertion pattern match failed"/utf8>>,
                                        value => _assert_fail@2,
                                        module => <<"jackson/internal/resolver"/utf8>>,
                                        function => <<"resolve_array_ref"/utf8>>,
                                        line => 42})
                    end,
                    gleam@list:index_fold(
                        Entries,
                        {error, nil},
                        fun(Found, Val, Index) -> case {Found, Index} of
                                {_, _} when Index =:= Idx@1 ->
                                    {ok, Val};

                                {_, _} ->
                                    Found
                            end end
                    )
            end,
            gleam@result:'try'(Indexed_item, fun(Json) -> case Next of
                        none ->
                            {ok, Json};

                        {some, Ref@1} ->
                            resolve_loop(Json, Ref@1)
                    end end)
        end
    ).

-spec resolve_loop(jackson@internal@json:json(), ref()) -> {ok,
        jackson@internal@json:json()} |
    {error, nil}.
resolve_loop(Json, Ref) ->
    case Json of
        {object, Entries} ->
            resolve_object_ref(Entries, Ref);

        {array, Entries@1} ->
            resolve_array_ref(Entries@1, Ref);

        _ ->
            {error, nil}
    end.

-spec resolve(jackson@internal@json:json(), binary()) -> {ok,
        jackson@internal@json:json()} |
    {error, nil}.
resolve(Json, Ref) ->
    _assert_subject = parse_ref(Ref),
    {root, _, Next_ref} = case _assert_subject of
        {root, _, _} -> _assert_subject;
        _assert_fail ->
            erlang:error(#{gleam_error => let_assert,
                        message => <<"Assertion pattern match failed"/utf8>>,
                        value => _assert_fail,
                        module => <<"jackson/internal/resolver"/utf8>>,
                        function => <<"resolve"/utf8>>,
                        line => 16})
    end,
    case Next_ref of
        none ->
            {ok, Json};

        {some, Ref@1} ->
            resolve_loop(Json, Ref@1)
    end.

-spec resolve_object_ref(list({binary(), jackson@internal@json:json()}), ref()) -> {ok,
        jackson@internal@json:json()} |
    {error, nil}.
resolve_object_ref(Entries, Ref) ->
    {ref, Value, Next} = case Ref of
        {ref, _, _} -> Ref;
        _assert_fail ->
            erlang:error(#{gleam_error => let_assert,
                        message => <<"Assertion pattern match failed"/utf8>>,
                        value => _assert_fail,
                        module => <<"jackson/internal/resolver"/utf8>>,
                        function => <<"resolve_object_ref"/utf8>>,
                        line => 64})
    end,
    Search_codepoints = gleam@string:to_utf_codepoints(Value),
    Found = gleam@list:find(
        Entries,
        fun(Entry) ->
            Key_codepoints = gleam@string:to_utf_codepoints(
                erlang:element(1, Entry)
            ),
            gleam@bool:guard(
                Search_codepoints =:= Key_codepoints,
                true,
                fun() -> false end
            )
        end
    ),
    gleam@result:'try'(
        Found,
        fun(_use0) ->
            {_, Json} = _use0,
            case Next of
                none ->
                    {ok, Json};

                {some, Ref@1} ->
                    resolve_loop(Json, Ref@1)
            end
        end
    ).