-module(oaspec@codegen@validate).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/oaspec/codegen/validate.gleam").
-export([error_to_string/1, validate/1]).
-export_type([validation_error/0]).

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

-type validation_error() :: {unsupported_feature, binary(), binary()}.

-file("src/oaspec/codegen/validate.gleam", 26).
?DOC(" Convert a validation error to a human-readable string.\n").
-spec error_to_string(validation_error()) -> binary().
error_to_string(Error) ->
    case Error of
        {unsupported_feature, Path, Detail} ->
            <<<<<<"Unsupported feature at "/utf8, Path/binary>>/binary,
                    ": "/utf8>>/binary,
                Detail/binary>>
    end.

-file("src/oaspec/codegen/validate.gleam", 46).
?DOC(" Validate parameters for unsupported patterns (e.g., deepObject style).\n").
-spec validate_parameters(binary(), list(oaspec@openapi@spec:parameter())) -> list(validation_error()).
validate_parameters(Op_id, Params) ->
    gleam@list:filter_map(Params, fun(Param) -> case erlang:element(7, Param) of
                {some, <<"deepObject"/utf8>>} ->
                    {ok,
                        {unsupported_feature,
                            <<<<Op_id/binary, ".parameters."/utf8>>/binary,
                                (erlang:element(2, Param))/binary>>,
                            <<"style: deepObject is not supported. Gleam cannot express deep object query serialization."/utf8>>}};

                _ ->
                    {error, nil}
            end end).

-file("src/oaspec/codegen/validate.gleam", 63).
?DOC(" Validate request body for unsupported patterns (e.g., non-JSON content types).\n").
-spec validate_request_body(
    binary(),
    gleam@option:option(oaspec@openapi@spec:request_body())
) -> list(validation_error()).
validate_request_body(Op_id, Request_body) ->
    case Request_body of
        none ->
            [];

        {some, Rb} ->
            Content_keys = maps:keys(erlang:element(3, Rb)),
            Non_json = gleam@list:filter(
                Content_keys,
                fun(Key) -> Key /= <<"application/json"/utf8>> end
            ),
            case Non_json of
                [] ->
                    [];

                [Media_type | _] ->
                    [{unsupported_feature,
                            <<Op_id/binary, ".requestBody"/utf8>>,
                            <<<<"Content type '"/utf8, Media_type/binary>>/binary,
                                "' is not supported. Only 'application/json' is supported."/utf8>>}]
            end
    end.

-file("src/oaspec/codegen/validate.gleam", 202).
?DOC(" Check if any schema in a list is an inline primitive type.\n").
-spec has_inline_primitive_schemas(list(oaspec@openapi@schema:schema_ref())) -> boolean().
has_inline_primitive_schemas(Schemas) ->
    gleam@list:any(Schemas, fun(S) -> case S of
                {inline, {string_schema, _, _, _, _, _, _, _}} ->
                    true;

                {inline, {integer_schema, _, _, _, _, _}} ->
                    true;

                {inline, {number_schema, _, _, _, _, _}} ->
                    true;

                {inline, {boolean_schema, _, _}} ->
                    true;

                _ ->
                    false
            end end).

-file("src/oaspec/codegen/validate.gleam", 124).
?DOC(" Validate oneOf/anyOf schemas: inline primitives are unsupported.\n").
-spec validate_oneof_schemas(binary(), list(oaspec@openapi@schema:schema_ref())) -> list(validation_error()).
validate_oneof_schemas(Path, Schemas) ->
    Has_inline_primitives = has_inline_primitive_schemas(Schemas),
    case Has_inline_primitives of
        true ->
            [{unsupported_feature,
                    Path,
                    <<"oneOf/anyOf with inline primitive types is not supported. Use $ref to named schemas instead."/utf8>>}];

        false ->
            []
    end.

-file("src/oaspec/codegen/validate.gleam", 112).
?DOC(" Validate inline schemas for unsupported patterns.\n").
-spec validate_schema_inline(binary(), oaspec@openapi@schema:schema_object()) -> list(validation_error()).
validate_schema_inline(Path, Schema_obj) ->
    case Schema_obj of
        {one_of_schema, _, Schemas, _} ->
            validate_oneof_schemas(Path, Schemas);

        {any_of_schema, _, Schemas@1} ->
            validate_oneof_schemas(Path, Schemas@1);

        _ ->
            []
    end.

-file("src/oaspec/codegen/validate.gleam", 89).
?DOC(" Validate response schemas for inline oneOf with mixed primitives.\n").
-spec validate_responses(
    binary(),
    gleam@dict:dict(binary(), oaspec@openapi@spec:response())
) -> list(validation_error()).
validate_responses(Op_id, Responses) ->
    Entries = maps:to_list(Responses),
    gleam@list:flat_map(
        Entries,
        fun(Entry) ->
            {Status_code, Response} = Entry,
            Content_entries = maps:to_list(erlang:element(3, Response)),
            gleam@list:flat_map(
                Content_entries,
                fun(Ce) ->
                    {_, Media_type} = Ce,
                    case erlang:element(2, Media_type) of
                        {some, {inline, Schema_obj}} ->
                            validate_schema_inline(
                                <<<<Op_id/binary, ".responses."/utf8>>/binary,
                                    Status_code/binary>>,
                                Schema_obj
                            );

                        _ ->
                            []
                    end
                end
            )
        end
    ).

-file("src/oaspec/codegen/validate.gleam", 34).
?DOC(" Validate all operations for unsupported patterns.\n").
-spec validate_operations(oaspec@codegen@context:context()) -> list(validation_error()).
validate_operations(Ctx) ->
    Operations = oaspec@codegen@types:collect_operations(Ctx),
    gleam@list:flat_map(
        Operations,
        fun(Op) ->
            {Op_id, Operation, _, _} = Op,
            Param_errors = validate_parameters(
                Op_id,
                erlang:element(6, Operation)
            ),
            Body_errors = validate_request_body(
                Op_id,
                erlang:element(7, Operation)
            ),
            Response_errors = validate_responses(
                Op_id,
                erlang:element(8, Operation)
            ),
            lists:append([Param_errors, Body_errors, Response_errors])
        end
    ).

-file("src/oaspec/codegen/validate.gleam", 177).
?DOC(" Validate object properties for unsupported patterns.\n").
-spec validate_object_properties(
    binary(),
    gleam@dict:dict(binary(), oaspec@openapi@schema:schema_ref())
) -> list(validation_error()).
validate_object_properties(Path, Properties) ->
    Entries = maps:to_list(Properties),
    gleam@list:flat_map(
        Entries,
        fun(Entry) ->
            {Prop_name, Prop_ref} = Entry,
            Prop_path = <<<<Path/binary, "."/utf8>>/binary, Prop_name/binary>>,
            case Prop_ref of
                {inline, {one_of_schema, _, Schemas, _}} ->
                    validate_oneof_schemas(Prop_path, Schemas);

                {inline, {any_of_schema, _, Schemas@1}} ->
                    validate_oneof_schemas(Prop_path, Schemas@1);

                {inline, {object_schema, _, _, _, _, true, _}} ->
                    [{unsupported_feature,
                            Prop_path,
                            <<"additionalProperties: true is not supported. Gleam has no untyped map type."/utf8>>}];

                _ ->
                    []
            end
        end
    ).

-file("src/oaspec/codegen/validate.gleam", 153).
?DOC(" Validate a single component schema for unsupported patterns.\n").
-spec validate_component_schema(binary(), oaspec@openapi@schema:schema_ref()) -> list(validation_error()).
validate_component_schema(Path, Schema_ref) ->
    case Schema_ref of
        {inline, {object_schema, _, Properties, _, _, true, _}} ->
            Prop_errors = validate_object_properties(Path, Properties),
            [{unsupported_feature,
                    Path,
                    <<"additionalProperties: true is not supported. Gleam has no untyped map type."/utf8>>} |
                Prop_errors];

        {inline, {object_schema, _, Properties@1, _, _, _, _}} ->
            validate_object_properties(Path, Properties@1);

        {inline, {one_of_schema, _, Schemas, _}} ->
            validate_oneof_schemas(Path, Schemas);

        {inline, {any_of_schema, _, Schemas@1}} ->
            validate_oneof_schemas(Path, Schemas@1);

        _ ->
            []
    end.

-file("src/oaspec/codegen/validate.gleam", 141).
?DOC(" Validate component schemas for unsupported patterns.\n").
-spec validate_component_schemas(oaspec@codegen@context:context()) -> list(validation_error()).
validate_component_schemas(Ctx) ->
    Schemas = case erlang:element(5, erlang:element(2, Ctx)) of
        {some, Components} ->
            maps:to_list(erlang:element(2, Components));

        none ->
            []
    end,
    gleam@list:flat_map(
        Schemas,
        fun(Entry) ->
            {Name, Schema_ref} = Entry,
            validate_component_schema(
                <<"components.schemas."/utf8, Name/binary>>,
                Schema_ref
            )
        end
    ).

-file("src/oaspec/codegen/validate.gleam", 19).
?DOC(
    " Validate the parsed spec for unsupported patterns.\n"
    " Returns a list of errors; empty list means validation passed.\n"
).
-spec validate(oaspec@codegen@context:context()) -> list(validation_error()).
validate(Ctx) ->
    Op_errors = validate_operations(Ctx),
    Schema_errors = validate_component_schemas(Ctx),
    lists:append(Op_errors, Schema_errors).