-module(oaspec@internal@openapi@reachability).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/oaspec/internal/openapi/reachability.gleam").
-export([prune/1]).

-if(?OTP_RELEASE >= 27).
-define(MODULEDOC(Str), -moduledoc(Str)).
-define(DOC(Str), -doc(Str)).
-else.
-define(MODULEDOC(Str), -compile([])).
-define(DOC(Str), -compile([])).
-endif.

?MODULEDOC(false).

-file("src/oaspec/internal/openapi/reachability.gleam", 156).
?DOC(false).
-spec refs_from_media_dict(
    gleam@dict:dict(binary(), oaspec@internal@openapi@spec:media_type())
) -> list(oaspec@internal@openapi@schema:schema_ref()).
refs_from_media_dict(Content) ->
    _pipe = maps:values(Content),
    gleam@list:filter_map(
        _pipe,
        fun(Mt) -> gleam@option:to_result(erlang:element(2, Mt), nil) end
    ).

-file("src/oaspec/internal/openapi/reachability.gleam", 137).
?DOC(false).
-spec refs_from_parameter_ref(
    oaspec@internal@openapi@spec:ref_or(oaspec@internal@openapi@spec:parameter(oaspec@internal@openapi@spec:resolved()))
) -> list(oaspec@internal@openapi@schema:schema_ref()).
refs_from_parameter_ref(Pref) ->
    case Pref of
        {value, P} ->
            case erlang:element(6, P) of
                {parameter_schema, S} ->
                    [S];

                {parameter_content, Content} ->
                    refs_from_media_dict(Content)
            end;

        {ref, _} ->
            []
    end.

-file("src/oaspec/internal/openapi/reachability.gleam", 148).
?DOC(false).
-spec refs_from_response(
    oaspec@internal@openapi@spec:response(oaspec@internal@openapi@spec:resolved())
) -> list(oaspec@internal@openapi@schema:schema_ref()).
refs_from_response(R) ->
    Content_refs = refs_from_media_dict(erlang:element(3, R)),
    Header_refs = begin
        _pipe = maps:values(erlang:element(4, R)),
        gleam@list:filter_map(
            _pipe,
            fun(H) -> gleam@option:to_result(erlang:element(4, H), nil) end
        )
    end,
    lists:append([Content_refs, Header_refs]).

-file("src/oaspec/internal/openapi/reachability.gleam", 225).
?DOC(false).
-spec discriminator_mapping_refs(
    gleam@option:option(oaspec@internal@openapi@schema:discriminator())
) -> list(oaspec@internal@openapi@schema:schema_ref()).
discriminator_mapping_refs(Discriminator) ->
    case Discriminator of
        {some, D} ->
            _pipe = maps:values(erlang:element(3, D)),
            gleam@list:map(
                _pipe,
                fun oaspec@internal@openapi@schema:make_reference/1
            );

        none ->
            []
    end.

-file("src/oaspec/internal/openapi/reachability.gleam", 201).
?DOC(false).
-spec refs_from_schema_object(oaspec@internal@openapi@schema:schema_object()) -> list(oaspec@internal@openapi@schema:schema_ref()).
refs_from_schema_object(Schema) ->
    case Schema of
        {object_schema, _, Properties, _, Additional_properties, _, _} ->
            Prop_refs = maps:values(Properties),
            Ap_refs = case Additional_properties of
                {typed, S} ->
                    [S];

                forbidden ->
                    [];

                untyped ->
                    [];

                unspecified ->
                    []
            end,
            lists:append([Prop_refs, Ap_refs]);

        {array_schema, _, Items, _, _, _} ->
            [Items];

        {all_of_schema, _, Schemas} ->
            Schemas;

        {one_of_schema, _, Schemas@1, Discriminator} ->
            lists:append([Schemas@1, discriminator_mapping_refs(Discriminator)]);

        {any_of_schema, _, Schemas@2, Discriminator@1} ->
            lists:append(
                [Schemas@2, discriminator_mapping_refs(Discriminator@1)]
            );

        _ ->
            []
    end.

-file("src/oaspec/internal/openapi/reachability.gleam", 164).
?DOC(false).
-spec walk(
    list(oaspec@internal@openapi@schema:schema_ref()),
    gleam@dict:dict(binary(), nil),
    gleam@dict:dict(binary(), oaspec@internal@openapi@schema:schema_ref())
) -> gleam@dict:dict(binary(), nil).
walk(Worklist, Reached, Schemas) ->
    case Worklist of
        [] ->
            Reached;

        [Ref | Rest] ->
            case Ref of
                {reference, _, Name} ->
                    case gleam@dict:has_key(Reached, Name) of
                        true ->
                            walk(Rest, Reached, Schemas);

                        false ->
                            Reached@1 = gleam@dict:insert(Reached, Name, nil),
                            case gleam_stdlib:map_get(Schemas, Name) of
                                {ok, Target} ->
                                    walk([Target | Rest], Reached@1, Schemas);

                                {error, nil} ->
                                    walk(Rest, Reached@1, Schemas)
                            end
                    end;

                {inline, Obj} ->
                    Children = refs_from_schema_object(Obj),
                    walk(lists:append(Children, Rest), Reached, Schemas)
            end
    end.

-file("src/oaspec/internal/openapi/reachability.gleam", 128).
?DOC(false).
-spec refs_from_callback_ref(
    oaspec@internal@openapi@spec:ref_or(oaspec@internal@openapi@spec:callback(oaspec@internal@openapi@spec:resolved()))
) -> list(oaspec@internal@openapi@schema:schema_ref()).
refs_from_callback_ref(Cb_ref) ->
    case Cb_ref of
        {value, {callback, Entries}} ->
            _pipe = maps:values(Entries),
            gleam@list:flat_map(_pipe, fun refs_from_path_ref/1);

        {ref, _} ->
            []
    end.

-file("src/oaspec/internal/openapi/reachability.gleam", 82).
?DOC(false).
-spec refs_from_path_ref(
    oaspec@internal@openapi@spec:ref_or(oaspec@internal@openapi@spec:path_item(oaspec@internal@openapi@spec:resolved()))
) -> list(oaspec@internal@openapi@schema:schema_ref()).
refs_from_path_ref(Path_ref) ->
    case Path_ref of
        {value, Item} ->
            refs_from_path_item(Item);

        {ref, _} ->
            []
    end.

-file("src/oaspec/internal/openapi/reachability.gleam", 89).
?DOC(false).
-spec refs_from_path_item(
    oaspec@internal@openapi@spec:path_item(oaspec@internal@openapi@spec:resolved())
) -> list(oaspec@internal@openapi@schema:schema_ref()).
refs_from_path_item(Item) ->
    Path_param_refs = gleam@list:flat_map(
        erlang:element(12, Item),
        fun refs_from_parameter_ref/1
    ),
    Op_refs = begin
        _pipe = [erlang:element(4, Item),
            erlang:element(5, Item),
            erlang:element(6, Item),
            erlang:element(7, Item),
            erlang:element(8, Item),
            erlang:element(9, Item),
            erlang:element(10, Item),
            erlang:element(11, Item)],
        _pipe@1 = gleam@list:filter_map(
            _pipe,
            fun(_capture) -> gleam@option:to_result(_capture, nil) end
        ),
        gleam@list:flat_map(_pipe@1, fun refs_from_operation/1)
    end,
    lists:append([Path_param_refs, Op_refs]).

-file("src/oaspec/internal/openapi/reachability.gleam", 107).
?DOC(false).
-spec refs_from_operation(
    oaspec@internal@openapi@spec:operation(oaspec@internal@openapi@spec:resolved())
) -> list(oaspec@internal@openapi@schema:schema_ref()).
refs_from_operation(Op) ->
    Parameter_refs = gleam@list:flat_map(
        erlang:element(6, Op),
        fun refs_from_parameter_ref/1
    ),
    Body_refs = case erlang:element(7, Op) of
        {some, {value, Rb}} ->
            refs_from_media_dict(erlang:element(3, Rb));

        {some, {ref, _}} ->
            [];

        none ->
            []
    end,
    Response_refs = begin
        _pipe = maps:values(erlang:element(8, Op)),
        gleam@list:flat_map(_pipe, fun(Rr) -> case Rr of
                    {value, R} ->
                        refs_from_response(R);

                    {ref, _} ->
                        []
                end end)
    end,
    Callback_refs = begin
        _pipe@1 = maps:values(erlang:element(11, Op)),
        gleam@list:flat_map(_pipe@1, fun refs_from_callback_ref/1)
    end,
    lists:append([Parameter_refs, Body_refs, Response_refs, Callback_refs]).

-file("src/oaspec/internal/openapi/reachability.gleam", 72).
?DOC(false).
-spec collect_seed_refs(
    oaspec@internal@openapi@spec:open_api_spec(oaspec@internal@openapi@spec:resolved())
) -> list(oaspec@internal@openapi@schema:schema_ref()).
collect_seed_refs(Spec) ->
    Path_refs = begin
        _pipe = maps:values(erlang:element(4, Spec)),
        gleam@list:flat_map(_pipe, fun refs_from_path_ref/1)
    end,
    Webhook_refs = begin
        _pipe@1 = maps:values(erlang:element(8, Spec)),
        gleam@list:flat_map(_pipe@1, fun refs_from_path_ref/1)
    end,
    lists:append([Path_refs, Webhook_refs]).

-file("src/oaspec/internal/openapi/reachability.gleam", 50).
?DOC(false).
-spec prune(
    oaspec@internal@openapi@spec:open_api_spec(oaspec@internal@openapi@spec:resolved())
) -> oaspec@internal@openapi@spec:open_api_spec(oaspec@internal@openapi@spec:resolved()).
prune(Spec) ->
    case erlang:element(5, Spec) of
        none ->
            Spec;

        {some, Components} ->
            Seeds = collect_seed_refs(Spec),
            Reached = walk(Seeds, maps:new(), erlang:element(2, Components)),
            Pruned_schemas = begin
                _pipe = erlang:element(2, Components),
                _pipe@1 = maps:to_list(_pipe),
                _pipe@2 = gleam@list:filter(
                    _pipe@1,
                    fun(Entry) ->
                        gleam@dict:has_key(Reached, erlang:element(1, Entry))
                    end
                ),
                maps:from_list(_pipe@2)
            end,
            {open_api_spec,
                erlang:element(2, Spec),
                erlang:element(3, Spec),
                erlang:element(4, Spec),
                {some,
                    {components,
                        Pruned_schemas,
                        erlang:element(3, Components),
                        erlang:element(4, Components),
                        erlang:element(5, Components),
                        erlang:element(6, Components),
                        erlang:element(7, Components),
                        erlang:element(8, Components),
                        erlang:element(9, Components),
                        erlang:element(10, Components),
                        erlang:element(11, Components)}},
                erlang:element(6, Spec),
                erlang:element(7, Spec),
                erlang:element(8, Spec),
                erlang:element(9, Spec),
                erlang:element(10, Spec),
                erlang:element(11, Spec)}
    end.