// Copyright 2023 Google LLC

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//     https://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#include "google/protobuf/struct.pb.h"

#include "absl/base/nullability.h"

#include "absl/log/absl_check.h"

#include "absl/status/status.h"

#include "common/value.h"

#include "internal/status_macros.h"

#include "internal/well_known_types.h"

#include "google/protobuf/arena.h"

#include "google/protobuf/descriptor.h"

#include "google/protobuf/io/zero_copy_stream.h"

#include "google/protobuf/message.h"

namespace cel {

using ::cel::well_known_types::ValueReflection;

absl::Status NullValue::SerializeTo(

    const google::protobuf::DescriptorPool* absl_nonnull descriptor_pool,

    google::protobuf::MessageFactory* absl_nonnull message_factory,

    google::protobuf::io::ZeroCopyOutputStream* absl_nonnull output) const {

  ABSL_DCHECK(descriptor_pool != nullptr);

  ABSL_DCHECK(message_factory != nullptr);

  ABSL_DCHECK(output != nullptr);

  google::protobuf::Value message;

  message.set_null_value(google::protobuf::NULL_VALUE);

  if (!message.SerializePartialToZeroCopyStream(output)) {

    return absl::UnknownError(

        "failed to serialize message: google.protobuf.Value");

  }

  return absl::OkStatus();

}

absl::Status NullValue::ConvertToJson(

    const google::protobuf::DescriptorPool* absl_nonnull descriptor_pool,

    google::protobuf::MessageFactory* absl_nonnull message_factory,

    google::protobuf::Message* absl_nonnull json) const {

  ABSL_DCHECK(descriptor_pool != nullptr);

  ABSL_DCHECK(message_factory != nullptr);

  ABSL_DCHECK(json != nullptr);

  ABSL_DCHECK_EQ(json->GetDescriptor()->well_known_type(),

                 google::protobuf::Descriptor::WELLKNOWNTYPE_VALUE);

  ValueReflection value_reflection;

  CEL_RETURN_IF_ERROR(value_reflection.Initialize(json->GetDescriptor()));

  value_reflection.SetNullValue(json);

  return absl::OkStatus();

}

absl::Status NullValue::Equal(

    const Value& other,

    const google::protobuf::DescriptorPool* absl_nonnull descriptor_pool,

    google::protobuf::MessageFactory* absl_nonnull message_factory,

    google::protobuf::Arena* absl_nonnull arena, Value* absl_nonnull result) const {

  ABSL_DCHECK(descriptor_pool != nullptr);

  ABSL_DCHECK(message_factory != nullptr);

  ABSL_DCHECK(arena != nullptr);

  ABSL_DCHECK(result != nullptr);

  *result = BoolValue(other.IsNull());

  return absl::OkStatus();

}

}  // namespace cel