// Copyright 2022 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.

#ifndef THIRD_PARTY_NEARBY_PRESENCE_ADVERTISEMENT_DECODER_H_
#define THIRD_PARTY_NEARBY_PRESENCE_ADVERTISEMENT_DECODER_H_

#include <string>
#include <vector>

#include "absl/status/status.h"
#include "absl/status/statusor.h"
#include "presence/data_element.h"
#include "presence/implementation/advertisement_factory.h"
#include "presence/implementation/credential_manager.h"

namespace nearby {
namespace presence {

// Decodes BLE NP advertisements
class AdvertisementDecoder {
 public:
  explicit AdvertisementDecoder(CredentialManager* credential_manager)
      : credential_manager_(*ABSL_DIE_IF_NULL(credential_manager)) {}

  // Returns a list of Data Elements decoded from the advertisement.
  // Returns an error if the advertisement is misformatted or if it couldn't be
  // decrypted.
  absl::StatusOr<std::vector<DataElement>> DecodeAdvertisement(
      absl::string_view advertisement);

 private:
  CredentialManager& credential_manager_;
};

}  // namespace presence
}  // namespace nearby

#endif  // THIRD_PARTY_NEARBY_PRESENCE_ADVERTISEMENT_DECODER_H_