// Copyright (c) 2012-2015, 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/>.

#include "RpcServer.h"

#include <future>
#include <unordered_map>

// CryptoNote
#include "cryptonote_core/cryptonote_core.h"
#include "cryptonote_core/miner.h"
#include "p2p/net_node.h"

#include "core_rpc_server_error_codes.h"
#include "JsonRpc.h"

#undef ERROR

using namespace Logging;

namespace CryptoNote {

namespace {

template <typename Command>
RpcServer::HandlerFunction binMethod(bool (RpcServer::*handler)(typename Command::request const&, typename Command::response&)) {
  return [handler](RpcServer* obj, const HttpRequest& request, HttpResponse& response) {

    boost::value_initialized<typename Command::request> req;
    boost::value_initialized<typename Command::response> res;

    if (!loadFromBinaryKeyValue(static_cast<typename Command::request&>(req), request.getBody())) {
      return false;
    }

    bool result = (obj->*handler)(req, res);
    response.setBody(storeToBinaryKeyValue(res.data()));
    return result;
  };
}

template <typename Command>
RpcServer::HandlerFunction jsonMethod(bool (RpcServer::*handler)(typename Command::request const&, typename Command::response&)) {
  return [handler](RpcServer* obj, const HttpRequest& request, HttpResponse& response) {

    boost::value_initialized<typename Command::request> req;
    boost::value_initialized<typename Command::response> res;

    if (!loadFromJson(static_cast<typename Command::request&>(req), request.getBody())) {
      return false;
    }

    bool result = (obj->*handler)(req, res);
    response.setBody(storeToJson(res.data()));
    return result;
  };
}

}
  
std::unordered_map<std::string, RpcServer::HandlerFunction> RpcServer::s_handlers = {
  
  // binary handlers
  { "/getblocks.bin", binMethod<COMMAND_RPC_GET_BLOCKS_FAST>(&RpcServer::on_get_blocks) },
  { "/queryblocks.bin", binMethod<COMMAND_RPC_QUERY_BLOCKS>(&RpcServer::on_query_blocks) },
  { "/get_o_indexes.bin", binMethod<COMMAND_RPC_GET_TX_GLOBAL_OUTPUTS_INDEXES>(&RpcServer::on_get_indexes) },
  { "/getrandom_outs.bin", binMethod<COMMAND_RPC_GET_RANDOM_OUTPUTS_FOR_AMOUNTS>(&RpcServer::on_get_random_outs) },
  { "/get_pool_changes.bin", binMethod<COMMAND_RPC_GET_POOL_CHANGES>(&RpcServer::onGetPoolChanges) },

  // json handlers
  { "/getinfo", jsonMethod<COMMAND_RPC_GET_INFO>(&RpcServer::on_get_info) },
  { "/getheight", jsonMethod<COMMAND_RPC_GET_HEIGHT>(&RpcServer::on_get_height) },
  { "/gettransactions", jsonMethod<COMMAND_RPC_GET_TRANSACTIONS>(&RpcServer::on_get_transactions)},
  { "/sendrawtransaction", jsonMethod<COMMAND_RPC_SEND_RAW_TX>(&RpcServer::on_send_raw_tx) },
  { "/start_mining", jsonMethod<COMMAND_RPC_START_MINING>(&RpcServer::on_start_mining) },
  { "/stop_mining", jsonMethod<COMMAND_RPC_STOP_MINING>(&RpcServer::on_stop_mining) },
  { "/stop_daemon", jsonMethod<COMMAND_RPC_STOP_DAEMON>(&RpcServer::on_stop_daemon) },

  // json rpc
  { "/json_rpc", std::bind(&RpcServer::processJsonRpcRequest, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3) }
};

RpcServer::RpcServer(System::Dispatcher& dispatcher, Logging::ILogger& log, core& c, node_server& p2p) :
  HttpServer(dispatcher, log), logger(log, "RpcServer"), m_core(c), m_p2p(p2p) {
}

void RpcServer::processRequest(const HttpRequest& request, HttpResponse& response) {
  auto url = request.getUrl();
  
  auto it = s_handlers.find(url);
  if (it == s_handlers.end()) {
    response.setStatus(HttpResponse::STATUS_404);
    return;
  }

  if (url != "/json_rpc" && !checkCoreReady()) {
    response.setStatus(HttpResponse::STATUS_500);
    response.setBody("Core is busy");
    return;
  }

  it->second(this, request, response);
}

bool RpcServer::processJsonRpcRequest(const HttpRequest& request, HttpResponse& response) {

  using namespace JsonRpc;

  response.addHeader("Content-Type", "application/json");

  JsonRpcRequest jsonRequest;
  JsonRpcResponse jsonResponse;

  try {
    logger(TRACE) << "JSON-RPC request: " << request.getBody();
    jsonRequest.parseRequest(request.getBody());
    jsonResponse.setId(jsonRequest.getId()); // copy id

    static std::unordered_map<std::string, JsonMemberMethod> jsonRpcHandlers = {
      { "getblockcount", makeMemberMethod(&RpcServer::on_getblockcount) },
      { "on_getblockhash", makeMemberMethod(&RpcServer::on_getblockhash) },
      { "getblocktemplate", makeMemberMethod(&RpcServer::on_getblocktemplate) },
      { "getcurrencyid", makeMemberMethod(&RpcServer::on_get_currency_id) },
      { "submitblock", makeMemberMethod(&RpcServer::on_submitblock) },
      { "getlastblockheader", makeMemberMethod(&RpcServer::on_get_last_block_header) },
      { "getblockheaderbyhash", makeMemberMethod(&RpcServer::on_get_block_header_by_hash) },
      { "getblockheaderbyheight", makeMemberMethod(&RpcServer::on_get_block_header_by_height) }
    };

    auto it = jsonRpcHandlers.find(jsonRequest.getMethod());
    if (it == jsonRpcHandlers.end()) {
      throw JsonRpcError(JsonRpc::errMethodNotFound);
    }

    if (jsonRequest.getMethod() != "getcurrencyid" && !checkCoreReady()) {
      throw JsonRpcError(CORE_RPC_ERROR_CODE_CORE_BUSY, "Core is busy");
    }

    it->second(this, jsonRequest, jsonResponse);

  } catch (const JsonRpcError& err) {
    jsonResponse.setError(err);
  } catch (const std::exception& e) {
    jsonResponse.setError(JsonRpcError(JsonRpc::errInternalError, e.what()));
  }

  response.setBody(jsonResponse.getBody());
  logger(TRACE) << "JSON-RPC response: " << jsonResponse.getBody();
  return true;
}

#define CHECK_CORE_READY()

bool RpcServer::checkCoreReady() {
  return m_core.is_ready() && m_p2p.get_payload_object().isSynchronized();
}

//
// Binary handlers
//

bool RpcServer::on_get_blocks(const COMMAND_RPC_GET_BLOCKS_FAST::request& req, COMMAND_RPC_GET_BLOCKS_FAST::response& res) {
  
  std::list<std::pair<Block, std::list<Transaction>>> bs;
  if (!m_core.find_blockchain_supplement(req.block_ids, bs, res.current_height, res.start_height, COMMAND_RPC_GET_BLOCKS_FAST_MAX_COUNT)) {
    res.status = "Failed";
    return false;
  }

  for (auto& b : bs) {
    res.blocks.resize(res.blocks.size() + 1);
    res.blocks.back().block = block_to_blob(b.first);
    for (auto& t : b.second) {
      res.blocks.back().txs.push_back(tx_to_blob(t));
    }
  }

  res.status = CORE_RPC_STATUS_OK;
  return true;
}

bool RpcServer::on_query_blocks(const COMMAND_RPC_QUERY_BLOCKS::request& req, COMMAND_RPC_QUERY_BLOCKS::response& res) {
  CHECK_CORE_READY();

  if (!m_core.queryBlocks(req.block_ids, req.timestamp, res.start_height, res.current_height, res.full_offset, res.items)) {
    res.status = "Failed to perform query";
    return false;
  }

  res.status = CORE_RPC_STATUS_OK;
  return true;
}

bool RpcServer::on_get_indexes(const COMMAND_RPC_GET_TX_GLOBAL_OUTPUTS_INDEXES::request& req, COMMAND_RPC_GET_TX_GLOBAL_OUTPUTS_INDEXES::response& res) {
  CHECK_CORE_READY();

  if (!m_core.get_tx_outputs_gindexs(req.txid, res.o_indexes)) {
    res.status = "Failed";
    return true;
  }

  res.status = CORE_RPC_STATUS_OK;
  logger(TRACE) << "COMMAND_RPC_GET_TX_GLOBAL_OUTPUTS_INDEXES: [" << res.o_indexes.size() << "]";
  return true;
}

bool RpcServer::on_get_random_outs(const COMMAND_RPC_GET_RANDOM_OUTPUTS_FOR_AMOUNTS::request& req, COMMAND_RPC_GET_RANDOM_OUTPUTS_FOR_AMOUNTS::response& res) {
  CHECK_CORE_READY();
  res.status = "Failed";
  if (!m_core.get_random_outs_for_amounts(req, res)) {
    return true;
  }

  res.status = CORE_RPC_STATUS_OK;

  std::stringstream ss;
  typedef COMMAND_RPC_GET_RANDOM_OUTPUTS_FOR_AMOUNTS::outs_for_amount outs_for_amount;
  typedef COMMAND_RPC_GET_RANDOM_OUTPUTS_FOR_AMOUNTS::out_entry out_entry;

  std::for_each(res.outs.begin(), res.outs.end(), [&](outs_for_amount& ofa)  {
    ss << "[" << ofa.amount << "]:";

    assert(ofa.outs.size() && "internal error: ofa.outs.size() is empty");

    std::for_each(ofa.outs.begin(), ofa.outs.end(), [&](out_entry& oe)
    {
      ss << oe.global_amount_index << " ";
    });
    ss << ENDL;
  });
  std::string s = ss.str();
  logger(TRACE) << "COMMAND_RPC_GET_RANDOM_OUTPUTS_FOR_AMOUNTS: " << ENDL << s;
  res.status = CORE_RPC_STATUS_OK;
  return true;
}

bool RpcServer::onGetPoolChanges(const COMMAND_RPC_GET_POOL_CHANGES::request& req, COMMAND_RPC_GET_POOL_CHANGES::response& rsp) {
  CHECK_CORE_READY();

  rsp.status = CORE_RPC_STATUS_OK;
  std::vector<CryptoNote::Transaction> addedTransactions;
  rsp.isTailBlockActual = m_core.getPoolChanges(req.tailBlockId, req.knownTxsIds, addedTransactions, rsp.deletedTxsIds);
  if (rsp.isTailBlockActual) {
    for (auto& tx : addedTransactions) {
      blobdata txBlob;
      if (!CryptoNote::tx_to_blob(tx, txBlob)) {
        rsp.status = "Internal error";
        break;;
      }

      rsp.addedTxs.emplace_back(std::move(txBlob));
    }
  }

  return true;
}


//
// JSON handlers
//

bool RpcServer::on_get_info(const COMMAND_RPC_GET_INFO::request& req, COMMAND_RPC_GET_INFO::response& res) {
  res.height = m_core.get_current_blockchain_height();
  res.difficulty = m_core.get_blockchain_storage().get_difficulty_for_next_block();
  res.tx_count = m_core.get_blockchain_storage().get_total_transactions() - res.height; //without coinbase
  res.tx_pool_size = m_core.get_pool_transactions_count();
  res.alt_blocks_count = m_core.get_blockchain_storage().get_alternative_blocks_count();
  uint64_t total_conn = m_p2p.get_connections_count();
  res.outgoing_connections_count = m_p2p.get_outgoing_connections_count();
  res.incoming_connections_count = total_conn - res.outgoing_connections_count;
  res.white_peerlist_size = m_p2p.get_peerlist_manager().get_white_peers_count();
  res.grey_peerlist_size = m_p2p.get_peerlist_manager().get_gray_peers_count();
  res.status = CORE_RPC_STATUS_OK;
  return true;
}

bool RpcServer::on_get_height(const COMMAND_RPC_GET_HEIGHT::request& req, COMMAND_RPC_GET_HEIGHT::response& res) {
  CHECK_CORE_READY();
  res.height = m_core.get_current_blockchain_height();
  res.status = CORE_RPC_STATUS_OK;
  return true;
}

bool RpcServer::on_get_transactions(const COMMAND_RPC_GET_TRANSACTIONS::request& req, COMMAND_RPC_GET_TRANSACTIONS::response& res) {
  CHECK_CORE_READY();
  std::vector<crypto::hash> vh;
  for (const auto& tx_hex_str : req.txs_hashes) {
    blobdata b;
    if (!hexToBlob(tx_hex_str, b))
    {
      res.status = "Failed to parse hex representation of transaction hash";
      return true;
    }
    if (b.size() != sizeof(crypto::hash))
    {
      res.status = "Failed, size of data mismatch";
    }
    vh.push_back(*reinterpret_cast<const crypto::hash*>(b.data()));
  }
  std::list<crypto::hash> missed_txs;
  std::list<Transaction> txs;
  m_core.getTransactions(vh, txs, missed_txs);

  for (auto& tx : txs) {
    blobdata blob = t_serializable_object_to_blob(tx);
    res.txs_as_hex.push_back(blobToHex(blob));
  }

  for (const auto& miss_tx : missed_txs) {
    res.missed_tx.push_back(Common::podToHex(miss_tx));
  }

  res.status = CORE_RPC_STATUS_OK;
  return true;
}

bool RpcServer::on_send_raw_tx(const COMMAND_RPC_SEND_RAW_TX::request& req, COMMAND_RPC_SEND_RAW_TX::response& res) {
  CHECK_CORE_READY();

  std::string tx_blob;
  if (!hexToBlob(req.tx_as_hex, tx_blob))
  {
    logger(INFO) << "[on_send_raw_tx]: Failed to parse tx from hexbuff: " << req.tx_as_hex;
    res.status = "Failed";
    return true;
  }

  tx_verification_context tvc = boost::value_initialized<tx_verification_context>();
  if (!m_core.handle_incoming_tx(tx_blob, tvc, false))
  {
    logger(INFO) << "[on_send_raw_tx]: Failed to process tx";
    res.status = "Failed";
    return true;
  }

  if (tvc.m_verifivation_failed)
  {
    logger(INFO) << "[on_send_raw_tx]: tx verification failed";
    res.status = "Failed";
    return true;
  }

  if (!tvc.m_should_be_relayed)
  {
    logger(INFO) << "[on_send_raw_tx]: tx accepted, but not relayed";
    res.status = "Not relayed";
    return true;
  }


  NOTIFY_NEW_TRANSACTIONS::request r;
  r.txs.push_back(tx_blob);
  m_core.get_protocol()->relay_transactions(r);
  //TODO: make sure that tx has reached other nodes here, probably wait to receive reflections from other nodes
  res.status = CORE_RPC_STATUS_OK;
  return true;
}

bool RpcServer::on_start_mining(const COMMAND_RPC_START_MINING::request& req, COMMAND_RPC_START_MINING::response& res) {
  CHECK_CORE_READY();
  AccountPublicAddress adr;
  if (!m_core.currency().parseAccountAddressString(req.miner_address, adr)) {
    res.status = "Failed, wrong address";
    return true;
  }

  boost::thread::attributes attrs;
  attrs.set_stack_size(THREAD_STACK_SIZE);

  if (!m_core.get_miner().start(adr, static_cast<size_t>(req.threads_count), attrs)) {
    res.status = "Failed, mining not started";
    return true;
  }

  res.status = CORE_RPC_STATUS_OK;
  return true;
}

bool RpcServer::on_stop_mining(const COMMAND_RPC_STOP_MINING::request& req, COMMAND_RPC_STOP_MINING::response& res) {
  CHECK_CORE_READY();
  if (!m_core.get_miner().stop()) {
    res.status = "Failed, mining not stopped";
    return true;
  }
  res.status = CORE_RPC_STATUS_OK;
  return true;
}

bool RpcServer::on_stop_daemon(const COMMAND_RPC_STOP_DAEMON::request& req, COMMAND_RPC_STOP_DAEMON::response& res) {
  CHECK_CORE_READY();
  if (m_core.currency().isTestnet()) {
    m_p2p.send_stop_signal();
    res.status = CORE_RPC_STATUS_OK;
  } else {
    res.status = CORE_RPC_ERROR_CODE_INTERNAL_ERROR;
    return false;
  }
  return true;
}

//------------------------------------------------------------------------------------------------------------------------------
// JSON RPC methods
//------------------------------------------------------------------------------------------------------------------------------
bool RpcServer::on_getblockcount(const COMMAND_RPC_GETBLOCKCOUNT::request& req, COMMAND_RPC_GETBLOCKCOUNT::response& res) {
  res.count = m_core.get_current_blockchain_height();
  res.status = CORE_RPC_STATUS_OK;
  return true;
}

bool RpcServer::on_getblockhash(const COMMAND_RPC_GETBLOCKHASH::request& req, COMMAND_RPC_GETBLOCKHASH::response& res) {
  if (req.size() != 1) {
    throw JsonRpc::JsonRpcError{ CORE_RPC_ERROR_CODE_WRONG_PARAM, "Wrong parameters, expected height" };
  }

  uint64_t h = req[0];
  if (m_core.get_current_blockchain_height() <= h) {
    throw JsonRpc::JsonRpcError{ 
      CORE_RPC_ERROR_CODE_TOO_BIG_HEIGHT,
      std::string("To big height: ") + std::to_string(h) + ", current blockchain height = " + std::to_string(m_core.get_current_blockchain_height())
    };
  }

  res = Common::podToHex(m_core.getBlockIdByHeight(h));
  return true;
}

namespace {
  uint64_t slow_memmem(void* start_buff, size_t buflen, void* pat, size_t patlen)
  {
    void* buf = start_buff;
    void* end = (char*)buf + buflen - patlen;
    while ((buf = memchr(buf, ((char*)pat)[0], buflen)))
    {
      if (buf>end)
        return 0;
      if (memcmp(buf, pat, patlen) == 0)
        return (char*)buf - (char*)start_buff;
      buf = (char*)buf + 1;
    }
    return 0;
  }
}

bool RpcServer::on_getblocktemplate(const COMMAND_RPC_GETBLOCKTEMPLATE::request& req, COMMAND_RPC_GETBLOCKTEMPLATE::response& res) {
  if (req.reserve_size > TX_EXTRA_NONCE_MAX_COUNT) {
    throw JsonRpc::JsonRpcError{ CORE_RPC_ERROR_CODE_TOO_BIG_RESERVE_SIZE, "To big reserved size, maximum 255" };
  }

  AccountPublicAddress acc = boost::value_initialized<AccountPublicAddress>();

  if (!req.wallet_address.size() || !m_core.currency().parseAccountAddressString(req.wallet_address, acc)) {
    throw JsonRpc::JsonRpcError{ CORE_RPC_ERROR_CODE_WRONG_WALLET_ADDRESS, "Failed to parse wallet address" };
  }

  Block b = boost::value_initialized<Block>();
  CryptoNote::blobdata blob_reserve;
  blob_reserve.resize(req.reserve_size, 0);
  if (!m_core.get_block_template(b, acc, res.difficulty, res.height, blob_reserve)) {
    logger(ERROR) << "Failed to create block template";
    throw JsonRpc::JsonRpcError{ CORE_RPC_ERROR_CODE_INTERNAL_ERROR, "Internal error: failed to create block template" };
  }

  blobdata block_blob = t_serializable_object_to_blob(b);
  crypto::public_key tx_pub_key = CryptoNote::get_tx_pub_key_from_extra(b.minerTx);
  if (tx_pub_key == null_pkey) {
    logger(ERROR) << "Failed to find tx pub key in coinbase extra";
    throw JsonRpc::JsonRpcError{ CORE_RPC_ERROR_CODE_INTERNAL_ERROR, "Internal error: failed to find tx pub key in coinbase extra" };
  }

  if (0 < req.reserve_size) {
    res.reserved_offset = slow_memmem((void*)block_blob.data(), block_blob.size(), &tx_pub_key, sizeof(tx_pub_key));
    if (!res.reserved_offset) {
      logger(ERROR) << "Failed to find tx pub key in blockblob";
      throw JsonRpc::JsonRpcError{ CORE_RPC_ERROR_CODE_INTERNAL_ERROR, "Internal error: failed to create block template" };
    }
    res.reserved_offset += sizeof(tx_pub_key) + 3; //3 bytes: tag for TX_EXTRA_TAG_PUBKEY(1 byte), tag for TX_EXTRA_NONCE(1 byte), counter in TX_EXTRA_NONCE(1 byte)
    if (res.reserved_offset + req.reserve_size > block_blob.size()) {
      logger(ERROR) << "Failed to calculate offset for reserved bytes";
      throw JsonRpc::JsonRpcError{ CORE_RPC_ERROR_CODE_INTERNAL_ERROR, "Internal error: failed to create block template" };
    }
  } else {
    res.reserved_offset = 0;
  }

  res.blocktemplate_blob = blobToHex(block_blob);
  res.status = CORE_RPC_STATUS_OK;

  return true;
}

bool RpcServer::on_get_currency_id(const COMMAND_RPC_GET_CURRENCY_ID::request& /*req*/, COMMAND_RPC_GET_CURRENCY_ID::response& res) {
  crypto::hash currencyId = m_core.currency().genesisBlockHash();
  blobdata blob = t_serializable_object_to_blob(currencyId);
  res.currency_id_blob = blobToHex(blob);
  return true;
}

bool RpcServer::on_submitblock(const COMMAND_RPC_SUBMITBLOCK::request& req, COMMAND_RPC_SUBMITBLOCK::response& res) {
  if (req.size() != 1) {
    throw JsonRpc::JsonRpcError{ CORE_RPC_ERROR_CODE_WRONG_PARAM, "Wrong param" };
  }

  blobdata blockblob;
  if (!hexToBlob(req[0], blockblob)) {
    throw JsonRpc::JsonRpcError{ CORE_RPC_ERROR_CODE_WRONG_BLOCKBLOB, "Wrong block blob" };
  }

  block_verification_context bvc = boost::value_initialized<block_verification_context>();
  System::Event event(m_dispatcher);
  auto resultFuture = std::async(std::launch::async, [this, &event, &bvc, &blockblob]{
    m_core.handle_incoming_block_blob(blockblob, bvc, true, true);
    m_dispatcher.remoteSpawn([&event]() { event.set(); });
  });

  event.wait();
  resultFuture.get();

  if (!bvc.m_added_to_main_chain) {
    throw JsonRpc::JsonRpcError{ CORE_RPC_ERROR_CODE_BLOCK_NOT_ACCEPTED, "Block not accepted" };
  }

  res.status = CORE_RPC_STATUS_OK;
  return true;
}


namespace {
  uint64_t get_block_reward(const Block& blk) {
    uint64_t reward = 0;
    for (const TransactionOutput& out : blk.minerTx.vout) {
      reward += out.amount;
    }
    return reward;
  }
}

void RpcServer::fill_block_header_responce(const Block& blk, bool orphan_status, uint64_t height, const crypto::hash& hash, block_header_responce& responce) {
  responce.major_version = blk.majorVersion;
  responce.minor_version = blk.minorVersion;
  responce.timestamp = blk.timestamp;
  responce.prev_hash = Common::podToHex(blk.prevId);
  responce.nonce = blk.nonce;
  responce.orphan_status = orphan_status;
  responce.height = height;
  responce.depth = m_core.get_current_blockchain_height() - height - 1;
  responce.hash = Common::podToHex(hash);
  responce.difficulty = m_core.get_blockchain_storage().block_difficulty(height);
  responce.reward = get_block_reward(blk);
}

bool RpcServer::on_get_last_block_header(const COMMAND_RPC_GET_LAST_BLOCK_HEADER::request& req, COMMAND_RPC_GET_LAST_BLOCK_HEADER::response& res) {
  uint64_t last_block_height;
  crypto::hash last_block_hash;
  
  if (!m_core.get_blockchain_top(last_block_height, last_block_hash)) {
    throw JsonRpc::JsonRpcError{ CORE_RPC_ERROR_CODE_INTERNAL_ERROR, "Internal error: can't get last block hash." };
  }

  Block last_block;
  if (!m_core.getBlockByHash(last_block_hash, last_block)) {
    throw JsonRpc::JsonRpcError{ CORE_RPC_ERROR_CODE_INTERNAL_ERROR, "Internal error: can't get last block hash." };
  }
  
  fill_block_header_responce(last_block, false, last_block_height, last_block_hash, res.block_header);
  res.status = CORE_RPC_STATUS_OK;
  return true;
}

bool RpcServer::on_get_block_header_by_hash(const COMMAND_RPC_GET_BLOCK_HEADER_BY_HASH::request& req, COMMAND_RPC_GET_BLOCK_HEADER_BY_HASH::response& res) {
  crypto::hash block_hash;

  if (!parse_hash256(req.hash, block_hash)) {
    throw JsonRpc::JsonRpcError{
      CORE_RPC_ERROR_CODE_WRONG_PARAM,
      "Failed to parse hex representation of block hash. Hex = " + req.hash + '.' };
  }

  Block blk;
  if (!m_core.getBlockByHash(block_hash, blk)) {
    throw JsonRpc::JsonRpcError{
      CORE_RPC_ERROR_CODE_INTERNAL_ERROR,
      "Internal error: can't get block by hash. Hash = " + req.hash + '.' };
  }

  if (blk.minerTx.vin.front().type() != typeid(TransactionInputGenerate)) {
    throw JsonRpc::JsonRpcError{
      CORE_RPC_ERROR_CODE_INTERNAL_ERROR,
      "Internal error: coinbase transaction in the block has the wrong type" };
  }

  uint64_t block_height = boost::get<TransactionInputGenerate>(blk.minerTx.vin.front()).height;
  fill_block_header_responce(blk, false, block_height, block_hash, res.block_header);
  res.status = CORE_RPC_STATUS_OK;
  return true;
}

bool RpcServer::on_get_block_header_by_height(const COMMAND_RPC_GET_BLOCK_HEADER_BY_HEIGHT::request& req, COMMAND_RPC_GET_BLOCK_HEADER_BY_HEIGHT::response& res) {
  if (m_core.get_current_blockchain_height() <= req.height) {
    throw JsonRpc::JsonRpcError{ CORE_RPC_ERROR_CODE_TOO_BIG_HEIGHT,
      std::string("To big height: ") + std::to_string(req.height) + ", current blockchain height = " + std::to_string(m_core.get_current_blockchain_height()) };
  }

  crypto::hash block_hash = m_core.getBlockIdByHeight(req.height);
  Block blk;
  if (!m_core.getBlockByHash(block_hash, blk)) {
    throw JsonRpc::JsonRpcError{ CORE_RPC_ERROR_CODE_INTERNAL_ERROR,
      "Internal error: can't get block by height. Height = " + std::to_string(req.height) + '.' };
  }

  fill_block_header_responce(blk, false, req.height, block_hash, res.block_header);
  res.status = CORE_RPC_STATUS_OK;
  return true;
}


}