text: // Copyright (c) 2011-2015 The Bitcoin Core developers
  // Copyright (c) 2014-2017 The Dash Core developers
  // Copyright (c) 2018-2021 The Documentchain developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include "transactionrecord.h"
  
  #include "base58.h"
  #include "consensus/consensus.h"
  #include "validation.h"
  #include "timedata.h"
  #include "wallet/wallet.h"
  
  #include "instantx.h"
  #include "privatesend.h"
  
  #include <stdint.h>
  
  #include <boost/foreach.hpp>
  
  /* Return positive answer if transaction should be shown in list.
   */
  bool TransactionRecord::showTransaction(const CWalletTx &wtx)
  {
      if (wtx.IsCoinBase())
      {
          // Ensures we show generated coins / mined transactions at depth 1
          if (!wtx.IsInMainChain())
          {
              return false;
          }
      }
      return true;
  }
  
  /*
   * Decompose CWallet transaction to model transaction records.
   */
  QList<TransactionRecord> TransactionRecord::decomposeTransaction(const CWallet *wallet, const CWalletTx &wtx)
  {
      QList<TransactionRecord> parts;
      int64_t nTime = wtx.GetTxTime();
      CAmount nCredit = wtx.GetCredit(ISMINE_ALL);
      CAmount nDebit = wtx.GetDebit(ISMINE_ALL);
      CAmount nNet = nCredit - nDebit;
      uint256 hash = wtx.GetHash();
      std::map<std::string, std::string> mapValue = wtx.mapValue;
  
      if (nNet > 0 || wtx.IsCoinBase())
      {
          //
          // Credit
          //
          for(unsigned int i = 0; i < wtx.tx->vout.size(); i++)
          {
              const CTxOut& txout = wtx.tx->vout[i];
              isminetype mine = wallet->IsMine(txout);
              if(mine)
              {
                  TransactionRecord sub(hash, nTime);
                  CTxDestination address;
                  sub.idx = i; // vout index
                  sub.credit = txout.nValue;
                  sub.involvesWatchAddress = mine & ISMINE_WATCH_ONLY;
                  if (ExtractDestination(txout.scriptPubKey, address) && IsMine(*wallet, address))
                  {
                      // Received by DMS Address
                      sub.type = TransactionRecord::RecvWithAddress;
                      sub.address = CBitcoinAddress(address).ToString();
                  }
                  else
                  {
                      // Received by IP connection (deprecated features), or a multisignature or other non-simple transaction
                      sub.type = TransactionRecord::RecvFromOther;
                      sub.address = mapValue["from"];
                  }
                  if (wtx.IsCoinBase())
                  {
                      // Generated
                      sub.type = TransactionRecord::Generated;
                  }
  
                  parts.append(sub);
              }
          }
      }
      else
      {
          bool fAllFromMeDenom = true;
          int nFromMe = 0;
          bool involvesWatchAddress = false;
          isminetype fAllFromMe = ISMINE_SPENDABLE;
          BOOST_FOREACH(const CTxIn& txin, wtx.tx->vin)
          {
              if(wallet->IsMine(txin)) {
                  fAllFromMeDenom = fAllFromMeDenom && wallet->IsDenominated(txin.prevout);
                  nFromMe++;
              }
              isminetype mine = wallet->IsMine(txin);
              if(mine & ISMINE_WATCH_ONLY) involvesWatchAddress = true;
              if(fAllFromMe > mine) fAllFromMe = mine;
          }
  
          isminetype fAllToMe = ISMINE_SPENDABLE;
          bool fAllToMeDenom = true;
          int nToMe = 0;
          BOOST_FOREACH(const CTxOut& txout, wtx.tx->vout) {
              if(wallet->IsMine(txout)) {
                  fAllToMeDenom = fAllToMeDenom && CPrivateSend::IsDenominatedAmount(txout.nValue);
                  nToMe++;
              }
              isminetype mine = wallet->IsMine(txout);
              if(mine & ISMINE_WATCH_ONLY) involvesWatchAddress = true;
              if(fAllToMe > mine) fAllToMe = mine;
          }
  
          if(fAllFromMeDenom && fAllToMeDenom && nFromMe * nToMe) {
              parts.append(TransactionRecord(hash, nTime, TransactionRecord::PrivateSendDenominate, "", -nDebit, nCredit));
              parts.last().involvesWatchAddress = false;   // maybe pass to TransactionRecord as constructor argument
          }
          else if (fAllFromMe && fAllToMe)
          {
              // Payment to self
              // TODO: this section still not accurate but covers most cases,
              // might need some additional work however
  
              TransactionRecord sub(hash, nTime);
              // Payment to self by default
              sub.type = TransactionRecord::SendToSelf;
              sub.address = "";
  
              if(mapValue["DS"] == "1")
              {
                  sub.type = TransactionRecord::PrivateSend;
                  CTxDestination address;
                  if (ExtractDestination(wtx.tx->vout[0].scriptPubKey, address))
                  {
                      // Sent to DMS Address
                      sub.address = CBitcoinAddress(address).ToString();
                  }
                  else
                  {
                      // Sent to IP, or other non-address transaction like OP_EVAL
                      sub.address = mapValue["to"];
                  }
              }
              else
              {
                  sub.idx = parts.size();
                  if(wtx.tx->vin.size() == 1 && wtx.tx->vout.size() == 1
                      && CPrivateSend::IsCollateralAmount(nDebit)
                      && CPrivateSend::IsCollateralAmount(nCredit)
                      && CPrivateSend::IsCollateralAmount(-nNet))
                  {
                      sub.type = TransactionRecord::PrivateSendCollateralPayment;
                  } else {
                      for (const auto& txout : wtx.tx->vout) {
                          if (txout.nValue == CPrivateSend::GetMaxCollateralAmount()) {
                              sub.type = TransactionRecord::PrivateSendMakeCollaterals;
                              continue; // Keep looking, could be a part of PrivateSendCreateDenominations
                          } else if (CPrivateSend::IsDenominatedAmount(txout.nValue)) {
                              sub.type = TransactionRecord::PrivateSendCreateDenominations;
                              break; // Done, it's definitely a tx creating mixing denoms, no need to look any further
                          }
                      }
                  }
              }
  
              CAmount nChange = wtx.GetChange();
  
              sub.debit = -(nDebit - nChange);
              sub.credit = nCredit - nChange;
              parts.append(sub);
              parts.last().involvesWatchAddress = involvesWatchAddress;   // maybe pass to TransactionRecord as constructor argument
          }
          else if (fAllFromMe)
          {
              //
              // Debit
              //
              CAmount nTxFee = nDebit - wtx.tx->GetValueOut();
  
              bool fDone = false;
              if(wtx.tx->vin.size() == 1 && wtx.tx->vout.size() == 1
                  && CPrivateSend::IsCollateralAmount(nDebit)
                  && nCredit == 0 // OP_RETURN
                  && CPrivateSend::IsCollateralAmount(-nNet))
              {
                  TransactionRecord sub(hash, nTime);
                  sub.idx = 0;
                  sub.type = TransactionRecord::PrivateSendCollateralPayment;
                  sub.debit = -nDebit;
                  parts.append(sub);
                  fDone = true;
              }
  
              for (unsigned int nOut = 0; nOut < wtx.tx->vout.size() && !fDone; nOut++)
              {
                  const CTxOut& txout = wtx.tx->vout[nOut];
                  TransactionRecord sub(hash, nTime);
                  sub.idx = nOut;
                  sub.involvesWatchAddress = involvesWatchAddress;
  
                  if(wallet->IsMine(txout))
                  {
                      // Ignore parts sent to self, as this is usually the change
                      // from a transaction sent back to our own address.
                      continue;
                  }
  
                  CTxDestination address;
                  if (ExtractDestination(txout.scriptPubKey, address))
                  {
                      // Sent to DMS Address
                      sub.type = TransactionRecord::SendToAddress;
                      sub.address = CBitcoinAddress(address).ToString();
                  }
                  else if (txout.nValue == 0)
                  {
                      // Sent Document Revision information to Blockchain
                      // TODO : document is currently recognized on nValue=0. Use transaction types.
                      sub.type = TransactionRecord::DocumentRevision;
                      sub.address = mapValue["to"]; // TODO : document GUID or name
                  }
                  else
                  {
                      // Sent to IP, or other non-address transaction like OP_EVAL
                      sub.type = TransactionRecord::SendToOther;
                      sub.address = mapValue["to"];
                  }
  
                  if(mapValue["DS"] == "1")
                  {
                      sub.type = TransactionRecord::PrivateSend;
                  }
  
                  CAmount nValue = txout.nValue;
                  /* Add fee to first output */
                  if (nTxFee > 0)
                  {
                      nValue += nTxFee;
                      nTxFee = 0;
                  }
                  sub.debit = -nValue;
  
                  parts.append(sub);
              }
          }
          else
          {
              //
              // Mixed debit transaction, can't break down payees
              //
              parts.append(TransactionRecord(hash, nTime, TransactionRecord::Other, "", nNet, 0));
              parts.last().involvesWatchAddress = involvesWatchAddress;
          }
      }
  
      return parts;
  }
  
  void TransactionRecord::updateStatus(const CWalletTx &wtx)
  {
      AssertLockHeld(cs_main);
      // Determine transaction status
  
      // Find the block the tx is in
      CBlockIndex* pindex = NULL;
      BlockMap::iterator mi = mapBlockIndex.find(wtx.hashBlock);
      if (mi != mapBlockIndex.end())
          pindex = (*mi).second;
  
      // Sort order, unrecorded transactions sort to the top
      status.sortKey = strprintf("%010d-%01d-%010u-%03d",
          (pindex ? pindex->nHeight : std::numeric_limits<int>::max()),
          (wtx.IsCoinBase() ? 1 : 0),
          wtx.nTimeReceived,
          idx);
      status.countsForBalance = wtx.IsTrusted() && !(wtx.GetBlocksToMaturity() > 0);
      status.depth = wtx.GetDepthInMainChain();
      status.cur_num_blocks = chainActive.Height();
      status.cur_num_ix_locks = nCompleteTXLocks;
  
      if (!CheckFinalTx(wtx))
      {
          if (wtx.tx->nLockTime < LOCKTIME_THRESHOLD)
          {
              status.status = TransactionStatus::OpenUntilBlock;
              status.open_for = wtx.tx->nLockTime - chainActive.Height();
          }
          else
          {
              status.status = TransactionStatus::OpenUntilDate;
              status.open_for = wtx.tx->nLockTime;
          }
      }
      // For generated transactions, determine maturity
      else if(type == TransactionRecord::Generated)
      {
          if (wtx.GetBlocksToMaturity() > 0)
          {
              status.status = TransactionStatus::Immature;
  
              if (wtx.IsInMainChain())
              {
                  status.matures_in = wtx.GetBlocksToMaturity();
  
                  // Check if the block was requested by anyone
                  if (GetAdjustedTime() - wtx.nTimeReceived > 2 * 60 && wtx.GetRequestCount() == 0)
                      status.status = TransactionStatus::MaturesWarning;
              }
              else
              {
                  status.status = TransactionStatus::NotAccepted;
              }
          }
          else
          {
              status.status = TransactionStatus::Confirmed;
          }
      }
      else
      {
          status.lockedByInstantSend = wtx.IsLockedByInstantSend();
          if (status.depth < 0)
          {
              status.status = TransactionStatus::Conflicted;
          }
          else if (GetAdjustedTime() - wtx.nTimeReceived > 2 * 60 && wtx.GetRequestCount() == 0)
          {
              status.status = TransactionStatus::Offline;
          }
          else if (status.depth == 0)
          {
              status.status = TransactionStatus::Unconfirmed;
              if (wtx.isAbandoned())
                  status.status = TransactionStatus::Abandoned;
          }
          else if (status.depth < RecommendedNumConfirmations)
          {
              status.status = TransactionStatus::Confirming;
          }
          else
          {
              status.status = TransactionStatus::Confirmed;
          }
      }
  
  }
  
  bool TransactionRecord::statusUpdateNeeded()
  {
      AssertLockHeld(cs_main);
      return status.cur_num_blocks != chainActive.Height() || status.cur_num_ix_locks != nCompleteTXLocks;
  }
  
  QString TransactionRecord::getTxID() const
  {
      return QString::fromStdString(hash.ToString());
  }
  
  int TransactionRecord::getOutputIndex() const
  {
      return idx;
  }
  