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#ifndef GRPC_INTERNAL_CPP_CLIENT_SECURE_CREDENTIALS_H
#define GRPC_INTERNAL_CPP_CLIENT_SECURE_CREDENTIALS_H

#include <grpc/grpc_security.h>

#include <grpc++/support/config.h>
#include <grpc++/security/credentials.h>

#include "src/cpp/server/thread_pool_interface.h"

namespace grpc {

class SecureCredentials GRPC_FINAL : public Credentials {
 public:
  explicit SecureCredentials(grpc_credentials* c_creds) : c_creds_(c_creds) {}
  ~SecureCredentials() GRPC_OVERRIDE { grpc_credentials_release(c_creds_); }
  grpc_credentials* GetRawCreds() { return c_creds_; }
  bool ApplyToCall(grpc_call* call) GRPC_OVERRIDE;

  std::shared_ptr<grpc::Channel> CreateChannel(
      const string& target, const grpc::ChannelArguments& args) GRPC_OVERRIDE;
  SecureCredentials* AsSecureCredentials() GRPC_OVERRIDE { return this; }

 private:
  grpc_credentials* const c_creds_;
};

class MetadataCredentialsPluginWrapper GRPC_FINAL {
 public:
  static void Destroy(void* wrapper);
  static void GetMetadata(void* wrapper, const char* service_url,
                          grpc_credentials_plugin_metadata_cb cb,
                          void* user_data);

  explicit MetadataCredentialsPluginWrapper(
      std::unique_ptr<MetadataCredentialsPlugin> plugin);

 private:
  void InvokePlugin(const char* service_url,
                    grpc_credentials_plugin_metadata_cb cb, void* user_data);
  std::unique_ptr<ThreadPoolInterface> thread_pool_;
  std::unique_ptr<MetadataCredentialsPlugin> plugin_;
};

}  // namespace grpc

#endif  // GRPC_INTERNAL_CPP_CLIENT_SECURE_CREDENTIALS_H