// Copyright 2020 Google LLC. All Rights Reserved. This file and proprietary
// source code may only be used and distributed under the Widevine Master
// License Agreement.

#ifndef EMM_PARSER_H
#define EMM_PARSER_H

#include <memory>
#include <vector>

#include "cas_types.h"
#include "media_cas.pb.h"

namespace wvcas {

using video_widevine::EmmPayload;

class EmmParser {
 public:
  EmmParser(const EmmParser&) = delete;
  EmmParser& operator=(const EmmParser&) = delete;
  virtual ~EmmParser() = default;

  // The EmmParser factory method.
  // The methods validates the passed in |emm|. If validation is successful, it
  // constructs and returns an EmmParser. Otherwise, nullptr is returned.
  static std::unique_ptr<const EmmParser> Create(const CasEmm& emm);

  // Accessor methods.
  virtual uint64_t timestamp() const { return timestamp_; }
  virtual std::string signature() const { return signature_; }
  virtual EmmPayload emm_payload() const { return emm_payload_; };

 protected:
  // Called by the factory create and unit test.
  EmmParser() = default;

 private:
  bool Parse(int start_index, const CasEmm& emm);

  uint8_t version_;
  uint64_t timestamp_;
  EmmPayload emm_payload_;
  std::string signature_;
};

}  // namespace wvcas

#endif  // EMM_PARSER_H