// Copyright (c) 2017-2019, The Monero Project
// 
// All rights reserved.
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// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
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// 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.
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// 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
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#pragma once

#include <string>
#include <boost/thread/mutex.hpp>
#include "include_base_utils.h"
#include "net/http_client.h"
#include "rpc/core_rpc_server_commands_defs.h"
#include "wallet_rpc_helpers.h"

namespace tools
{

class NodeRPCProxy
{
public:
  NodeRPCProxy(epee::net_utils::http::http_simple_client &http_client, rpc_payment_state_t &rpc_payment_state, boost::recursive_mutex &mutex);

  void set_client_secret_key(const crypto::secret_key &skey) { m_client_id_secret_key = skey; }
  void invalidate();
  void set_offline(bool offline) { m_offline = offline; }

  boost::optional<std::string> get_rpc_version(uint32_t &version);
  boost::optional<std::string> get_height(uint64_t &height);
  void set_height(uint64_t h);
  boost::optional<std::string> get_target_height(uint64_t &height);
  boost::optional<std::string> get_block_weight_limit(uint64_t &block_weight_limit);
  boost::optional<std::string> get_earliest_height(uint8_t version, uint64_t &earliest_height);
  boost::optional<std::string> get_dynamic_base_fee_estimate(uint64_t grace_blocks, uint64_t &fee);
  boost::optional<std::string> get_fee_quantization_mask(uint64_t &fee_quantization_mask);
  boost::optional<std::string> get_rpc_payment_info(bool mining, bool &payment_required, uint64_t &credits, uint64_t &diff, uint64_t &credits_per_hash_found, cryptonote::blobdata &blob, uint64_t &height, uint64_t &seed_height, crypto::hash &seed_hash, crypto::hash &next_seed_hash, uint32_t &cookie);

private:
  template<typename T> void handle_payment_changes(const T &res, std::true_type) {
    if (res.status == CORE_RPC_STATUS_OK || res.status == CORE_RPC_STATUS_PAYMENT_REQUIRED)
      m_rpc_payment_state.credits = res.credits;
    if (res.top_hash != m_rpc_payment_state.top_hash)
    {
      m_rpc_payment_state.top_hash = res.top_hash;
      m_rpc_payment_state.stale = true;
    }
  }
  template<typename T> void handle_payment_changes(const T &res, std::false_type) {}

private:
  boost::optional<std::string> get_info();

  epee::net_utils::http::http_simple_client &m_http_client;
  rpc_payment_state_t &m_rpc_payment_state;
  boost::recursive_mutex &m_daemon_rpc_mutex;
  crypto::secret_key m_client_id_secret_key;
  bool m_offline;

  uint64_t m_height;
  uint64_t m_earliest_height[256];
  uint64_t m_dynamic_base_fee_estimate;
  uint64_t m_dynamic_base_fee_estimate_cached_height;
  uint64_t m_dynamic_base_fee_estimate_grace_blocks;
  uint64_t m_fee_quantization_mask;
  uint32_t m_rpc_version;
  uint64_t m_target_height;
  uint64_t m_block_weight_limit;
  time_t m_get_info_time;
  time_t m_rpc_payment_info_time;
  uint64_t m_rpc_payment_diff;
  uint64_t m_rpc_payment_credits_per_hash_found;
  cryptonote::blobdata m_rpc_payment_blob;
  uint64_t m_rpc_payment_height;
  uint64_t m_rpc_payment_seed_height;
  crypto::hash m_rpc_payment_seed_hash;
  crypto::hash m_rpc_payment_next_seed_hash;
  uint32_t m_rpc_payment_cookie;
};

}