-module(oaspec@codegen@schema_utils).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/oaspec/codegen/schema_utils.gleam").
-export([schema_has_additional_properties/2, schema_has_untyped_additional_properties/2, constant_property_value/3, schema_ref_is_nullable/2, schema_has_optional_fields/2, schema_ref_is_read_only/2, schema_ref_is_write_only/2, filter_read_only_properties/2, filter_write_only_properties/2]).

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

-file("src/oaspec/codegen/schema_utils.gleam", 15).
?DOC(" Check if a schema has typed or untyped additionalProperties that would need Dict.\n").
-spec schema_has_additional_properties(
    oaspec@openapi@schema:schema_ref(),
    oaspec@codegen@context:context()
) -> boolean().
schema_has_additional_properties(Schema_ref, Ctx) ->
    case Schema_ref of
        {inline, {object_schema, _, _, _, {typed, _}, _, _}} ->
            true;

        {inline, {object_schema, _, _, _, untyped, _, _}} ->
            true;

        {inline, {all_of_schema, _, Schemas}} ->
            gleam@list:any(
                Schemas,
                fun(S) -> schema_has_additional_properties(S, Ctx) end
            );

        {reference, _, _} ->
            case oaspec@openapi@resolver:resolve_schema_ref(
                Schema_ref,
                oaspec@codegen@context:spec(Ctx)
            ) of
                {ok, Schema_obj} ->
                    schema_has_additional_properties({inline, Schema_obj}, Ctx);

                {error, _} ->
                    false
            end;

        _ ->
            false
    end.

-file("src/oaspec/codegen/schema_utils.gleam", 36).
?DOC(" Check if a schema has untyped additionalProperties (needs Dynamic import).\n").
-spec schema_has_untyped_additional_properties(
    oaspec@openapi@schema:schema_ref(),
    oaspec@codegen@context:context()
) -> boolean().
schema_has_untyped_additional_properties(Schema_ref, Ctx) ->
    case Schema_ref of
        {inline, {object_schema, _, _, _, untyped, _, _}} ->
            true;

        {inline, {all_of_schema, _, Schemas}} ->
            gleam@list:any(
                Schemas,
                fun(S) -> schema_has_untyped_additional_properties(S, Ctx) end
            );

        {reference, _, _} ->
            case oaspec@openapi@resolver:resolve_schema_ref(
                Schema_ref,
                oaspec@codegen@context:spec(Ctx)
            ) of
                {ok, Schema_obj} ->
                    schema_has_untyped_additional_properties(
                        {inline, Schema_obj},
                        Ctx
                    );

                {error, _} ->
                    false
            end;

        _ ->
            false
    end.

-file("src/oaspec/codegen/schema_utils.gleam", 92).
?DOC(
    " Issue #309: detect a property that is fully determined by the\n"
    " schema — an inline string-enum with exactly one allowed value that\n"
    " the parent schema lists as required. Such a property is a constant\n"
    " marker on the wire (e.g. a `kind: type: string, enum: [text]`\n"
    " discriminator on a oneOf variant): the only legal value is known\n"
    " at codegen time, so the generated record drops the field, the\n"
    " encoder emits the constant, and the decoder validates it.\n"
    "\n"
    " Returns `Some(value)` for an elidable constant property; `None`\n"
    " otherwise (including `$ref`s, multi-value enums, optional\n"
    " properties, and non-string schemas — those keep their current\n"
    " record-field shape).\n"
).
-spec constant_property_value(
    oaspec@openapi@schema:schema_ref(),
    binary(),
    list(binary())
) -> gleam@option:option(binary()).
constant_property_value(Prop_ref, Prop_name, Required) ->
    case {gleam@list:contains(Required, Prop_name), Prop_ref} of
        {true, {inline, {string_schema, _, _, [Single_value], _, _, _}}} ->
            {some, Single_value};

        {_, _} ->
            none
    end.

-file("src/oaspec/codegen/schema_utils.gleam", 105).
?DOC(" Check if a SchemaRef is nullable, resolving $ref if needed.\n").
-spec schema_ref_is_nullable(
    oaspec@openapi@schema:schema_ref(),
    oaspec@codegen@context:context()
) -> boolean().
schema_ref_is_nullable(Ref, Ctx) ->
    case Ref of
        {inline, Inline_schema} ->
            oaspec@openapi@schema:is_nullable(Inline_schema);

        {reference, _, _} ->
            case oaspec@openapi@resolver:resolve_schema_ref(
                Ref,
                oaspec@codegen@context:spec(Ctx)
            ) of
                {ok, Resolved} ->
                    oaspec@openapi@schema:is_nullable(Resolved);

                {error, _} ->
                    false
            end
    end.

-file("src/oaspec/codegen/schema_utils.gleam", 58).
?DOC(" Check if a schema has any optional or nullable fields that would need Option.\n").
-spec schema_has_optional_fields(
    oaspec@openapi@schema:schema_ref(),
    oaspec@codegen@context:context()
) -> boolean().
schema_has_optional_fields(Schema_ref, Ctx) ->
    case Schema_ref of
        {inline, {object_schema, _, Properties, Required, _, _, _}} ->
            _pipe = maps:to_list(Properties),
            gleam@list:any(
                _pipe,
                fun(Entry) ->
                    {Prop_name, Prop_ref} = Entry,
                    not gleam@list:contains(Required, Prop_name) orelse schema_ref_is_nullable(
                        Prop_ref,
                        Ctx
                    )
                end
            );

        {inline, {all_of_schema, _, Schemas}} ->
            gleam@list:any(
                Schemas,
                fun(S) -> schema_has_optional_fields(S, Ctx) end
            );

        {reference, _, _} ->
            case oaspec@openapi@resolver:resolve_schema_ref(
                Schema_ref,
                oaspec@codegen@context:spec(Ctx)
            ) of
                {ok, Schema_obj} ->
                    schema_has_optional_fields({inline, Schema_obj}, Ctx);

                {error, _} ->
                    false
            end;

        _ ->
            false
    end.

-file("src/oaspec/codegen/schema_utils.gleam", 118).
?DOC(" Check if a SchemaRef has readOnly metadata, resolving $ref if needed.\n").
-spec schema_ref_is_read_only(
    oaspec@openapi@schema:schema_ref(),
    oaspec@codegen@context:context()
) -> boolean().
schema_ref_is_read_only(Ref, Ctx) ->
    case Ref of
        {inline, Inline_schema} ->
            erlang:element(6, oaspec@openapi@schema:get_metadata(Inline_schema));

        {reference, _, _} ->
            case oaspec@openapi@resolver:resolve_schema_ref(
                Ref,
                oaspec@codegen@context:spec(Ctx)
            ) of
                {ok, Resolved} ->
                    erlang:element(
                        6,
                        oaspec@openapi@schema:get_metadata(Resolved)
                    );

                {error, _} ->
                    false
            end
    end.

-file("src/oaspec/codegen/schema_utils.gleam", 131).
?DOC(" Check if a SchemaRef has writeOnly metadata, resolving $ref if needed.\n").
-spec schema_ref_is_write_only(
    oaspec@openapi@schema:schema_ref(),
    oaspec@codegen@context:context()
) -> boolean().
schema_ref_is_write_only(Ref, Ctx) ->
    case Ref of
        {inline, Inline_schema} ->
            erlang:element(7, oaspec@openapi@schema:get_metadata(Inline_schema));

        {reference, _, _} ->
            case oaspec@openapi@resolver:resolve_schema_ref(
                Ref,
                oaspec@codegen@context:spec(Ctx)
            ) of
                {ok, Resolved} ->
                    erlang:element(
                        7,
                        oaspec@openapi@schema:get_metadata(Resolved)
                    );

                {error, _} ->
                    false
            end
    end.

-file("src/oaspec/codegen/schema_utils.gleam", 145).
?DOC(
    " Filter readOnly properties from an ObjectSchema for request body context.\n"
    " Returns a new schema with readOnly properties removed.\n"
).
-spec filter_read_only_properties(
    oaspec@openapi@schema:schema_object(),
    oaspec@codegen@context:context()
) -> oaspec@openapi@schema:schema_object().
filter_read_only_properties(Schema_obj, Ctx) ->
    case Schema_obj of
        {object_schema,
            Metadata,
            Properties,
            Required,
            Additional_properties,
            Min_properties,
            Max_properties} ->
            Filtered_props = gleam@dict:filter(
                Properties,
                fun(_, Prop_ref) ->
                    not schema_ref_is_read_only(Prop_ref, Ctx)
                end
            ),
            Filtered_required = gleam@list:filter(
                Required,
                fun(Name) -> case gleam_stdlib:map_get(Filtered_props, Name) of
                        {ok, _} ->
                            true;

                        {error, _} ->
                            false
                    end end
            ),
            {object_schema,
                Metadata,
                Filtered_props,
                Filtered_required,
                Additional_properties,
                Min_properties,
                Max_properties};

        _ ->
            Schema_obj
    end.

-file("src/oaspec/codegen/schema_utils.gleam", 185).
?DOC(
    " Filter writeOnly properties from an ObjectSchema for response body context.\n"
    " Returns a new schema with writeOnly properties removed.\n"
).
-spec filter_write_only_properties(
    oaspec@openapi@schema:schema_object(),
    oaspec@codegen@context:context()
) -> oaspec@openapi@schema:schema_object().
filter_write_only_properties(Schema_obj, Ctx) ->
    case Schema_obj of
        {object_schema,
            Metadata,
            Properties,
            Required,
            Additional_properties,
            Min_properties,
            Max_properties} ->
            Filtered_props = gleam@dict:filter(
                Properties,
                fun(_, Prop_ref) ->
                    not schema_ref_is_write_only(Prop_ref, Ctx)
                end
            ),
            Filtered_required = gleam@list:filter(
                Required,
                fun(Name) -> case gleam_stdlib:map_get(Filtered_props, Name) of
                        {ok, _} ->
                            true;

                        {error, _} ->
                            false
                    end end
            ),
            {object_schema,
                Metadata,
                Filtered_props,
                Filtered_required,
                Additional_properties,
                Min_properties,
                Max_properties};

        _ ->
            Schema_obj
    end.