// Copyright (c) 2012-2014, The CryptoNote developers, The Bytecoin developers
//
// This file is part of Bytecoin.
//
// Bytecoin is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Bytecoin is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with Bytecoin.  If not, see <http://www.gnu.org/licenses/>.

#pragma once

#include <cstdint>
#include <system_error>

#include "ITransaction.h"
#include "ITransfersContainer.h"
#include "IStreamSerializable.h"

namespace CryptoNote {

struct SynchronizationStart {
  uint64_t timestamp;
  uint64_t height;
};

struct AccountSubscription {
  AccountKeys keys;
  SynchronizationStart syncStart;
  size_t transactionSpendableAge;
};

class ITransfersSubscription;

class ITransfersObserver {
public:
  virtual void onError(ITransfersSubscription* object,
    uint64_t height, std::error_code ec) {}

  virtual void onTransactionUpdated(ITransfersSubscription* object, const Hash& transactionHash) {}

  /**
   * \note The sender must guarantee that onTransactionDeleted() is called only after onTransactionUpdated() is called
   * for the same \a transactionHash.
   */
  virtual void onTransactionDeleted(ITransfersSubscription* object, const Hash& transactionHash) { }
};

class ITransfersSubscription : public IObservable < ITransfersObserver > {
public:
  virtual ~ITransfersSubscription() {}

  virtual AccountAddress getAddress() = 0;
  virtual ITransfersContainer& getContainer() = 0;
};

class ITransfersSynchronizer : public IStreamSerializable {
public:
  virtual ~ITransfersSynchronizer() {}

  virtual ITransfersSubscription& addSubscription(const AccountSubscription& acc) = 0;
  virtual bool removeSubscription(const AccountAddress& acc) = 0;
  virtual void getSubscriptions(std::vector<AccountAddress>& subscriptions) = 0;
  // returns nullptr if address is not found
  virtual ITransfersSubscription* getSubscription(const AccountAddress& acc) = 0;
};

}