// Copyright (c) 2014-2022, The Monero Project
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
// 
// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
// 
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
//    of conditions and the following disclaimer in the documentation and/or other
//    materials provided with the distribution.
// 
// 3. Neither the name of the copyright holder nor the names of its contributors may be
//    used to endorse or promote products derived from this software without specific
//    prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 
// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers

#pragma once

#include <cstdint>
#include <system_error>

namespace CryptoNote {

class INodeObserver {
public:
  virtual void initCompleted(std::error_code result) {}

  virtual void peerCountUpdated(size_t count) {}
  virtual void lastLocalBlockHeightUpdated(uint64_t height) {}
  virtual void lastKnownBlockHeightUpdated(uint64_t height) {}

  virtual void blockchainReorganized(uint64_t height) {}
};

class INode {
public:
  virtual ~INode() = 0;
  virtual void addObserver(INodeObserver* observer) = 0;
  virtual void removeObserver(INodeObserver* observer) = 0;

  virtual void init() = 0;
  virtual void shutdown() = 0;

  virtual size_t getPeerCount() = 0;
  virtual uint64_t getLastLocalBlockHeight() = 0;
  virtual uint64_t getLastKnownBlockHeight() = 0;
};

}