text: // Copyright (c) 2009-2010 Satoshi Nakamoto
  // Copyright (c) 2009-2012 The Bitcoinbuck developers
  // Distributed under the MIT/X11 software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include "wallet.h"
  #include "walletdb.h"
  #include "crypter.h"
  #include "ui_interface.h"
  #include "base58.h"
  #include "kernel.h"
  
  using namespace std;
  extern int nStakeMaxAge;
  
  
  //////////////////////////////////////////////////////////////////////////////
  //
  // mapWallet
  //
  
  struct CompareValueOnly
  {
      bool operator()(const pair<int64, pair<const CWalletTx*, unsigned int> >& t1,
                      const pair<int64, pair<const CWalletTx*, unsigned int> >& t2) const
      {
          return t1.first < t2.first;
      }
  };
  
  CPubKey CWallet::GenerateNewKey()
  {
      bool fCompressed = CanSupportFeature(FEATURE_COMPRPUBKEY); // default to compressed public keys if we want 0.6.0 wallets
  
      RandAddSeedPerfmon();
      CKey key;
      key.MakeNewKey(fCompressed);
  
      // Compressed public keys were introduced in version 0.6.0
      if (fCompressed)
          SetMinVersion(FEATURE_COMPRPUBKEY);
  
      if (!AddKey(key))
          throw std::runtime_error("CWallet::GenerateNewKey() : AddKey failed");
      return key.GetPubKey();
  }
  
  bool CWallet::AddKey(const CKey& key)
  {
      if (!CCryptoKeyStore::AddKey(key))
          return false;
      if (!fFileBacked)
          return true;
      if (!IsCrypted())
          return CWalletDB(strWalletFile).WriteKey(key.GetPubKey(), key.GetPrivKey());
      return true;
  }
  
  bool CWallet::AddCryptedKey(const CPubKey &vchPubKey, const vector<unsigned char> &vchCryptedSecret)
  {
      if (!CCryptoKeyStore::AddCryptedKey(vchPubKey, vchCryptedSecret))
          return false;
      if (!fFileBacked)
          return true;
      {
          LOCK(cs_wallet);
          if (pwalletdbEncryption)
              return pwalletdbEncryption->WriteCryptedKey(vchPubKey, vchCryptedSecret);
          else
              return CWalletDB(strWalletFile).WriteCryptedKey(vchPubKey, vchCryptedSecret);
      }
      return false;
  }
  
  bool CWallet::AddCScript(const CScript& redeemScript)
  {
      if (!CCryptoKeyStore::AddCScript(redeemScript))
          return false;
      if (!fFileBacked)
          return true;
      return CWalletDB(strWalletFile).WriteCScript(Hash160(redeemScript), redeemScript);
  }
  
  // ppcoin: optional setting to unlock wallet for block minting only;
  //         serves to disable the trivial sendmoney when OS account compromised
  bool fWalletUnlockMintOnly = false;
  
  bool CWallet::Unlock(const SecureString& strWalletPassphrase)
  {
      if (!IsLocked())
          return false;
  
      CCrypter crypter;
      CKeyingMaterial vMasterKey;
  
      {
          LOCK(cs_wallet);
          BOOST_FOREACH(const MasterKeyMap::value_type& pMasterKey, mapMasterKeys)
          {
              if(!crypter.SetKeyFromPassphrase(strWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod))
                  return false;
              if (!crypter.Decrypt(pMasterKey.second.vchCryptedKey, vMasterKey))
                  return false;
              if (CCryptoKeyStore::Unlock(vMasterKey))
                  return true;
          }
      }
      return false;
  }
  
  bool CWallet::ChangeWalletPassphrase(const SecureString& strOldWalletPassphrase, const SecureString& strNewWalletPassphrase)
  {
      bool fWasLocked = IsLocked();
  
      {
          LOCK(cs_wallet);
          Lock();
  
          CCrypter crypter;
          CKeyingMaterial vMasterKey;
          BOOST_FOREACH(MasterKeyMap::value_type& pMasterKey, mapMasterKeys)
          {
              if(!crypter.SetKeyFromPassphrase(strOldWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod))
                  return false;
              if (!crypter.Decrypt(pMasterKey.second.vchCryptedKey, vMasterKey))
                  return false;
              if (CCryptoKeyStore::Unlock(vMasterKey))
              {
                  int64 nStartTime = GetTimeMillis();
                  crypter.SetKeyFromPassphrase(strNewWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod);
                  pMasterKey.second.nDeriveIterations = pMasterKey.second.nDeriveIterations * (100 / ((double)(GetTimeMillis() - nStartTime)));
  
                  nStartTime = GetTimeMillis();
                  crypter.SetKeyFromPassphrase(strNewWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod);
                  pMasterKey.second.nDeriveIterations = (pMasterKey.second.nDeriveIterations + pMasterKey.second.nDeriveIterations * 100 / ((double)(GetTimeMillis() - nStartTime))) / 2;
  
                  if (pMasterKey.second.nDeriveIterations < 25000)
                      pMasterKey.second.nDeriveIterations = 25000;
  
                  printf("Wallet passphrase changed to an nDeriveIterations of %i\n", pMasterKey.second.nDeriveIterations);
  
                  if (!crypter.SetKeyFromPassphrase(strNewWalletPassphrase, pMasterKey.second.vchSalt, pMasterKey.second.nDeriveIterations, pMasterKey.second.nDerivationMethod))
                      return false;
                  if (!crypter.Encrypt(vMasterKey, pMasterKey.second.vchCryptedKey))
                      return false;
                  CWalletDB(strWalletFile).WriteMasterKey(pMasterKey.first, pMasterKey.second);
                  if (fWasLocked)
                      Lock();
                  return true;
              }
          }
      }
  
      return false;
  }
  
  void CWallet::SetBestChain(const CBlockLocator& loc)
  {
      CWalletDB walletdb(strWalletFile);
      walletdb.WriteBestBlock(loc);
  }
  
  // This class implements an addrIncoming entry that causes pre-0.4
  // clients to crash on startup if reading a private-key-encrypted wallet.
  class CCorruptAddress
  {
  public:
      IMPLEMENT_SERIALIZE
      (
          if (nType & SER_DISK)
              READWRITE(nVersion);
      )
  };
  
  bool CWallet::SetMinVersion(enum WalletFeature nVersion, CWalletDB* pwalletdbIn, bool fExplicit)
  {
      if (nWalletVersion >= nVersion)
          return true;
  
      // when doing an explicit upgrade, if we pass the max version permitted, upgrade all the way
      if (fExplicit && nVersion > nWalletMaxVersion)
              nVersion = FEATURE_LATEST;
  
      nWalletVersion = nVersion;
  
      if (nVersion > nWalletMaxVersion)
          nWalletMaxVersion = nVersion;
  
      if (fFileBacked)
      {
          CWalletDB* pwalletdb = pwalletdbIn ? pwalletdbIn : new CWalletDB(strWalletFile);
          if (nWalletVersion >= 40000)
          {
              // Versions prior to 0.4.0 did not support the "minversion" record.
              // Use a CCorruptAddress to make them crash instead.
              CCorruptAddress corruptAddress;
              pwalletdb->WriteSetting("addrIncoming", corruptAddress);
          }
          if (nWalletVersion > 40000)
              pwalletdb->WriteMinVersion(nWalletVersion);
          if (!pwalletdbIn)
              delete pwalletdb;
      }
  
      return true;
  }
  
  bool CWallet::SetMaxVersion(int nVersion)
  {
      // cannot downgrade below current version
      if (nWalletVersion > nVersion)
          return false;
  
      nWalletMaxVersion = nVersion;
  
      return true;
  }
  
  bool CWallet::EncryptWallet(const SecureString& strWalletPassphrase)
  {
      if (IsCrypted())
          return false;
  
      CKeyingMaterial vMasterKey;
      RandAddSeedPerfmon();
  
      vMasterKey.resize(WALLET_CRYPTO_KEY_SIZE);
      RAND_bytes(&vMasterKey[0], WALLET_CRYPTO_KEY_SIZE);
  
      CMasterKey kMasterKey;
  
      RandAddSeedPerfmon();
      kMasterKey.vchSalt.resize(WALLET_CRYPTO_SALT_SIZE);
      RAND_bytes(&kMasterKey.vchSalt[0], WALLET_CRYPTO_SALT_SIZE);
  
      CCrypter crypter;
      int64 nStartTime = GetTimeMillis();
      crypter.SetKeyFromPassphrase(strWalletPassphrase, kMasterKey.vchSalt, 25000, kMasterKey.nDerivationMethod);
      kMasterKey.nDeriveIterations = 2500000 / ((double)(GetTimeMillis() - nStartTime));
  
      nStartTime = GetTimeMillis();
      crypter.SetKeyFromPassphrase(strWalletPassphrase, kMasterKey.vchSalt, kMasterKey.nDeriveIterations, kMasterKey.nDerivationMethod);
      kMasterKey.nDeriveIterations = (kMasterKey.nDeriveIterations + kMasterKey.nDeriveIterations * 100 / ((double)(GetTimeMillis() - nStartTime))) / 2;
  
      if (kMasterKey.nDeriveIterations < 25000)
          kMasterKey.nDeriveIterations = 25000;
  
      printf("Encrypting Wallet with an nDeriveIterations of %i\n", kMasterKey.nDeriveIterations);
  
      if (!crypter.SetKeyFromPassphrase(strWalletPassphrase, kMasterKey.vchSalt, kMasterKey.nDeriveIterations, kMasterKey.nDerivationMethod))
          return false;
      if (!crypter.Encrypt(vMasterKey, kMasterKey.vchCryptedKey))
          return false;
  
      {
          LOCK(cs_wallet);
          mapMasterKeys[++nMasterKeyMaxID] = kMasterKey;
          if (fFileBacked)
          {
              pwalletdbEncryption = new CWalletDB(strWalletFile);
              if (!pwalletdbEncryption->TxnBegin())
                  return false;
              pwalletdbEncryption->WriteMasterKey(nMasterKeyMaxID, kMasterKey);
          }
  
          if (!EncryptKeys(vMasterKey))
          {
              if (fFileBacked)
                  pwalletdbEncryption->TxnAbort();
              exit(1); //We now probably have half of our keys encrypted in memory, and half not...die and let the user reload their unencrypted wallet.
          }
  
          // Encryption was introduced in version 0.4.0
          SetMinVersion(FEATURE_WALLETCRYPT, pwalletdbEncryption, true);
  
          if (fFileBacked)
          {
              if (!pwalletdbEncryption->TxnCommit())
                  exit(1); //We now have keys encrypted in memory, but no on disk...die to avoid confusion and let the user reload their unencrypted wallet.
  
              delete pwalletdbEncryption;
              pwalletdbEncryption = NULL;
          }
  
          Lock();
          Unlock(strWalletPassphrase);
          NewKeyPool();
          Lock();
  
          // Need to completely rewrite the wallet file; if we don't, bdb might keep
          // bits of the unencrypted private key in slack space in the database file.
          CDB::Rewrite(strWalletFile);
  
      }
      NotifyStatusChanged(this);
  
      return true;
  }
  
  int64 CWallet::IncOrderPosNext(CWalletDB *pwalletdb)
  {
      int64 nRet = nOrderPosNext++;
      if (pwalletdb) {
          pwalletdb->WriteOrderPosNext(nOrderPosNext);
      } else {
          CWalletDB(strWalletFile).WriteOrderPosNext(nOrderPosNext);
      }
      return nRet;
  }
  
  CWallet::TxItems CWallet::OrderedTxItems(std::list<CAccountingEntry>& acentries, std::string strAccount)
  {
      CWalletDB walletdb(strWalletFile);
  
      // First: get all CWalletTx and CAccountingEntry into a sorted-by-order multimap.
      TxItems txOrdered;
  
      // Note: maintaining indices in the database of (account,time) --> txid and (account, time) --> acentry
      // would make this much faster for applications that do this a lot.
      for (map<uint256, CWalletTx>::iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
      {
          CWalletTx* wtx = &((*it).second);
          txOrdered.insert(make_pair(wtx->nOrderPos, TxPair(wtx, (CAccountingEntry*)0)));
      }
      acentries.clear();
      walletdb.ListAccountCreditDebit(strAccount, acentries);
      BOOST_FOREACH(CAccountingEntry& entry, acentries)
      {
          txOrdered.insert(make_pair(entry.nOrderPos, TxPair((CWalletTx*)0, &entry)));
      }
  
      return txOrdered;
  }
  
  void CWallet::WalletUpdateSpent(const CTransaction &tx)
  {
      // Anytime a signature is successfully verified, it's proof the outpoint is spent.
      // Update the wallet spent flag if it doesn't know due to wallet.dat being
      // restored from backup or the user making copies of wallet.dat.
      {
          LOCK(cs_wallet);
          BOOST_FOREACH(const CTxIn& txin, tx.vin)
          {
              map<uint256, CWalletTx>::iterator mi = mapWallet.find(txin.prevout.hash);
              if (mi != mapWallet.end())
              {
                  CWalletTx& wtx = (*mi).second;
                  if (txin.prevout.n >= wtx.vout.size())
                      printf("WalletUpdateSpent: bad wtx %s\n", wtx.GetHash().ToString().c_str());
                  else if (!wtx.IsSpent(txin.prevout.n) && IsMine(wtx.vout[txin.prevout.n]))
                  {
                      printf("WalletUpdateSpent found spent coin %snvc %s\n", FormatMoney(wtx.GetCredit()).c_str(), wtx.GetHash().ToString().c_str());
                      wtx.MarkSpent(txin.prevout.n);
                      wtx.WriteToDisk();
                      NotifyTransactionChanged(this, txin.prevout.hash, CT_UPDATED);
                  }
              }
          }
      }
  }
  
  void CWallet::MarkDirty()
  {
      {
          LOCK(cs_wallet);
          BOOST_FOREACH(PAIRTYPE(const uint256, CWalletTx)& item, mapWallet)
              item.second.MarkDirty();
      }
  }
  
  bool CWallet::AddToWallet(const CWalletTx& wtxIn)
  {
      uint256 hash = wtxIn.GetHash();
      {
          LOCK(cs_wallet);
          // Inserts only if not already there, returns tx inserted or tx found
          pair<map<uint256, CWalletTx>::iterator, bool> ret = mapWallet.insert(make_pair(hash, wtxIn));
          CWalletTx& wtx = (*ret.first).second;
          wtx.BindWallet(this);
          bool fInsertedNew = ret.second;
          if (fInsertedNew)
          {
              wtx.nTimeReceived = GetAdjustedTime();
              wtx.nOrderPos = IncOrderPosNext();
  
              wtx.nTimeSmart = wtx.nTimeReceived;
              if (wtxIn.hashBlock != 0)
              {
                  if (mapBlockIndex.count(wtxIn.hashBlock))
                  {
                      unsigned int latestNow = wtx.nTimeReceived;
                      unsigned int latestEntry = 0;
                      {
                          // Tolerate times up to the last timestamp in the wallet not more than 5 minutes into the future
                          int64 latestTolerated = latestNow + 300;
                          std::list<CAccountingEntry> acentries;
                          TxItems txOrdered = OrderedTxItems(acentries);
                          for (TxItems::reverse_iterator it = txOrdered.rbegin(); it != txOrdered.rend(); ++it)
                          {
                              CWalletTx *const pwtx = (*it).second.first;
                              if (pwtx == &wtx)
                                  continue;
                              CAccountingEntry *const pacentry = (*it).second.second;
                              int64 nSmartTime;
                              if (pwtx)
                              {
                                  nSmartTime = pwtx->nTimeSmart;
                                  if (!nSmartTime)
                                      nSmartTime = pwtx->nTimeReceived;
                              }
                              else
                                  nSmartTime = pacentry->nTime;
                              if (nSmartTime <= latestTolerated)
                              {
                                  latestEntry = nSmartTime;
                                  if (nSmartTime > latestNow)
                                      latestNow = nSmartTime;
                                  break;
                              }
                          }
                      }
  
                      unsigned int& blocktime = mapBlockIndex[wtxIn.hashBlock]->nTime;
                      wtx.nTimeSmart = std::max(latestEntry, std::min(blocktime, latestNow));
                  }
                  else
                      printf("AddToWallet() : found %s in block %s not in index\n",
                             wtxIn.GetHash().ToString().substr(0,10).c_str(),
                             wtxIn.hashBlock.ToString().c_str());
              }
          }
  
          bool fUpdated = false;
          if (!fInsertedNew)
          {
              // Merge
              if (wtxIn.hashBlock != 0 && wtxIn.hashBlock != wtx.hashBlock)
              {
                  wtx.hashBlock = wtxIn.hashBlock;
                  fUpdated = true;
              }
              if (wtxIn.nIndex != -1 && (wtxIn.vMerkleBranch != wtx.vMerkleBranch || wtxIn.nIndex != wtx.nIndex))
              {
                  wtx.vMerkleBranch = wtxIn.vMerkleBranch;
                  wtx.nIndex = wtxIn.nIndex;
                  fUpdated = true;
              }
              if (wtxIn.fFromMe && wtxIn.fFromMe != wtx.fFromMe)
              {
                  wtx.fFromMe = wtxIn.fFromMe;
                  fUpdated = true;
              }
              fUpdated |= wtx.UpdateSpent(wtxIn.vfSpent);
          }
  
          //// debug print
          printf("AddToWallet %s  %s%s\n", wtxIn.GetHash().ToString().substr(0,10).c_str(), (fInsertedNew ? "new" : ""), (fUpdated ? "update" : ""));
  
          // Write to disk
          if (fInsertedNew || fUpdated)
              if (!wtx.WriteToDisk())
                  return false;
  #ifndef QT_GUI
          // If default receiving address gets used, replace it with a new one
          CScript scriptDefaultKey;
          scriptDefaultKey.SetDestination(vchDefaultKey.GetID());
          BOOST_FOREACH(const CTxOut& txout, wtx.vout)
          {
              if (txout.scriptPubKey == scriptDefaultKey)
              {
                  CPubKey newDefaultKey;
                  if (GetKeyFromPool(newDefaultKey, false))
                  {
                      SetDefaultKey(newDefaultKey);
                      SetAddressBookName(vchDefaultKey.GetID(), "");
                  }
              }
          }
  #endif
          // since AddToWallet is called directly for self-originating transactions, check for consumption of own coins
          WalletUpdateSpent(wtx);
  
          // Notify UI of new or updated transaction
          NotifyTransactionChanged(this, hash, fInsertedNew ? CT_NEW : CT_UPDATED);
      }
      return true;
  }
  
  // Add a transaction to the wallet, or update it.
  // pblock is optional, but should be provided if the transaction is known to be in a block.
  // If fUpdate is true, existing transactions will be updated.
  bool CWallet::AddToWalletIfInvolvingMe(const CTransaction& tx, const CBlock* pblock, bool fUpdate, bool fFindBlock)
  {
      uint256 hash = tx.GetHash();
      {
          LOCK(cs_wallet);
          bool fExisted = mapWallet.count(hash);
          if (fExisted && !fUpdate) return false;
          if (fExisted || IsMine(tx) || IsFromMe(tx))
          {
              CWalletTx wtx(this,tx);
              // Get merkle branch if transaction was found in a block
              if (pblock)
                  wtx.SetMerkleBranch(pblock);
              return AddToWallet(wtx);
          }
          else
              WalletUpdateSpent(tx);
      }
      return false;
  }
  
  bool CWallet::EraseFromWallet(uint256 hash)
  {
      if (!fFileBacked)
          return false;
      {
          LOCK(cs_wallet);
          if (mapWallet.erase(hash))
              CWalletDB(strWalletFile).EraseTx(hash);
      }
      return true;
  }
  
  
  bool CWallet::IsMine(const CTxIn &txin) const
  {
      {
          LOCK(cs_wallet);
          map<uint256, CWalletTx>::const_iterator mi = mapWallet.find(txin.prevout.hash);
          if (mi != mapWallet.end())
          {
              const CWalletTx& prev = (*mi).second;
              if (txin.prevout.n < prev.vout.size())
                  if (IsMine(prev.vout[txin.prevout.n]))
                      return true;
          }
      }
      return false;
  }
  
  int64 CWallet::GetDebit(const CTxIn &txin) const
  {
      {
          LOCK(cs_wallet);
          map<uint256, CWalletTx>::const_iterator mi = mapWallet.find(txin.prevout.hash);
          if (mi != mapWallet.end())
          {
              const CWalletTx& prev = (*mi).second;
              if (txin.prevout.n < prev.vout.size())
                  if (IsMine(prev.vout[txin.prevout.n]))
                      return prev.vout[txin.prevout.n].nValue;
          }
      }
      return 0;
  }
  
  bool CWallet::IsChange(const CTxOut& txout) const
  {
      CTxDestination address;
  
      // TODO: fix handling of 'change' outputs. The assumption is that any
      // payment to a TX_PUBKEYHASH that is mine but isn't in the address book
      // is change. That assumption is likely to break when we implement multisignature
      // wallets that return change back into a multi-signature-protected address;
      // a better way of identifying which outputs are 'the send' and which are
      // 'the change' will need to be implemented (maybe extend CWalletTx to remember
      // which output, if any, was change).
      if (ExtractDestination(txout.scriptPubKey, address) && ::IsMine(*this, address))
      {
          LOCK(cs_wallet);
          if (!mapAddressBook.count(address))
              return true;
      }
      return false;
  }
  
  int64 CWalletTx::GetTxTime() const
  {
      int64 n = nTimeSmart;
      return n ? n : nTimeReceived;
  }
  
  int CWalletTx::GetRequestCount() const
  {
      // Returns -1 if it wasn't being tracked
      int nRequests = -1;
      {
          LOCK(pwallet->cs_wallet);
          if (IsCoinBase() || IsCoinStake())
          {
              // Generated block
              if (hashBlock != 0)
              {
                  map<uint256, int>::const_iterator mi = pwallet->mapRequestCount.find(hashBlock);
                  if (mi != pwallet->mapRequestCount.end())
                      nRequests = (*mi).second;
              }
          }
          else
          {
              // Did anyone request this transaction?
              map<uint256, int>::const_iterator mi = pwallet->mapRequestCount.find(GetHash());
              if (mi != pwallet->mapRequestCount.end())
              {
                  nRequests = (*mi).second;
  
                  // How about the block it's in?
                  if (nRequests == 0 && hashBlock != 0)
                  {
                      map<uint256, int>::const_iterator mi = pwallet->mapRequestCount.find(hashBlock);
                      if (mi != pwallet->mapRequestCount.end())
                          nRequests = (*mi).second;
                      else
                          nRequests = 1; // If it's in someone else's block it must have got out
                  }
              }
          }
      }
      return nRequests;
  }
  
  void CWalletTx::GetAmounts(int64& nGeneratedImmature, int64& nGeneratedMature, list<pair<CTxDestination, int64> >& listReceived,
                             list<pair<CTxDestination, int64> >& listSent, int64& nFee, string& strSentAccount) const
  {
      nGeneratedImmature = nGeneratedMature = nFee = 0;
      listReceived.clear();
      listSent.clear();
      strSentAccount = strFromAccount;
  
      if (IsCoinBase() || IsCoinStake())
      {
          if (GetBlocksToMaturity() > 0)
              nGeneratedImmature = pwallet->GetCredit(*this);
          else
              nGeneratedMature = GetCredit();
          return;
      }
  
      // Compute fee:
      int64 nDebit = GetDebit();
      if (nDebit > 0) // debit>0 means we signed/sent this transaction
      {
          int64 nValueOut = GetValueOut();
          nFee = nDebit - nValueOut;
      }
  
      // Sent/received.
      BOOST_FOREACH(const CTxOut& txout, vout)
      {
          CTxDestination address;
          vector<unsigned char> vchPubKey;
          if (!ExtractDestination(txout.scriptPubKey, address))
          {
              printf("CWalletTx::GetAmounts: Unknown transaction type found, txid %s\n",
                     this->GetHash().ToString().c_str());
          }
  
          // Don't report 'change' txouts
          if (nDebit > 0 && pwallet->IsChange(txout))
              continue;
  
          if (nDebit > 0)
              listSent.push_back(make_pair(address, txout.nValue));
  
          if (pwallet->IsMine(txout))
              listReceived.push_back(make_pair(address, txout.nValue));
      }
  
  }
  
  void CWalletTx::GetAccountAmounts(const string& strAccount, int64& nGenerated, int64& nReceived,
                                    int64& nSent, int64& nFee) const
  {
      nReceived = nSent = nFee = 0;
  
      int64 allGeneratedImmature, allGeneratedMature, allFee;
      string strSentAccount;
      list<pair<CTxDestination, int64> > listReceived;
      list<pair<CTxDestination, int64> > listSent;
      GetAmounts(allGeneratedImmature, allGeneratedMature, listReceived, listSent, allFee, strSentAccount);
  
      if (strAccount == "")
          nGenerated = allGeneratedMature;
      if (strAccount == strSentAccount)
      {
          BOOST_FOREACH(const PAIRTYPE(CTxDestination,int64)& s, listSent)
              nSent += s.second;
          nFee = allFee;
      }
      {
          LOCK(pwallet->cs_wallet);
          BOOST_FOREACH(const PAIRTYPE(CTxDestination,int64)& r, listReceived)
          {
              if (pwallet->mapAddressBook.count(r.first))
              {
                  map<CTxDestination, string>::const_iterator mi = pwallet->mapAddressBook.find(r.first);
                  if (mi != pwallet->mapAddressBook.end() && (*mi).second == strAccount)
                      nReceived += r.second;
              }
              else if (strAccount.empty())
              {
                  nReceived += r.second;
              }
          }
      }
  }
  
  void CWalletTx::AddSupportingTransactions(CTxDB& txdb)
  {
      vtxPrev.clear();
  
      const int COPY_DEPTH = 3;
      if (SetMerkleBranch() < COPY_DEPTH)
      {
          vector<uint256> vWorkQueue;
          BOOST_FOREACH(const CTxIn& txin, vin)
              vWorkQueue.push_back(txin.prevout.hash);
  
          // This critsect is OK because txdb is already open
          {
              LOCK(pwallet->cs_wallet);
              map<uint256, const CMerkleTx*> mapWalletPrev;
              set<uint256> setAlreadyDone;
              for (unsigned int i = 0; i < vWorkQueue.size(); i++)
              {
                  uint256 hash = vWorkQueue[i];
                  if (setAlreadyDone.count(hash))
                      continue;
                  setAlreadyDone.insert(hash);
  
                  CMerkleTx tx;
                  map<uint256, CWalletTx>::const_iterator mi = pwallet->mapWallet.find(hash);
                  if (mi != pwallet->mapWallet.end())
                  {
                      tx = (*mi).second;
                      BOOST_FOREACH(const CMerkleTx& txWalletPrev, (*mi).second.vtxPrev)
                          mapWalletPrev[txWalletPrev.GetHash()] = &txWalletPrev;
                  }
                  else if (mapWalletPrev.count(hash))
                  {
                      tx = *mapWalletPrev[hash];
                  }
                  else if (!fClient && txdb.ReadDiskTx(hash, tx))
                  {
                      ;
                  }
                  else
                  {
                      printf("ERROR: AddSupportingTransactions() : unsupported transaction\n");
                      continue;
                  }
  
                  int nDepth = tx.SetMerkleBranch();
                  vtxPrev.push_back(tx);
  
                  if (nDepth < COPY_DEPTH)
                  {
                      BOOST_FOREACH(const CTxIn& txin, tx.vin)
                          vWorkQueue.push_back(txin.prevout.hash);
                  }
              }
          }
      }
  
      reverse(vtxPrev.begin(), vtxPrev.end());
  }
  
  bool CWalletTx::WriteToDisk()
  {
      return CWalletDB(pwallet->strWalletFile).WriteTx(GetHash(), *this);
  }
  
  // Scan the block chain (starting in pindexStart) for transactions
  // from or to us. If fUpdate is true, found transactions that already
  // exist in the wallet will be updated.
  int CWallet::ScanForWalletTransactions(CBlockIndex* pindexStart, bool fUpdate)
  {
      int ret = 0;
  
      CBlockIndex* pindex = pindexStart;
      {
          LOCK(cs_wallet);
          while (pindex)
          {
              CBlock block;
              block.ReadFromDisk(pindex, true);
              BOOST_FOREACH(CTransaction& tx, block.vtx)
              {
                  if (AddToWalletIfInvolvingMe(tx, &block, fUpdate))
                      ret++;
              }
              pindex = pindex->pnext;
          }
      }
      return ret;
  }
  
  int CWallet::ScanForWalletTransaction(const uint256& hashTx)
  {
      CTransaction tx;
      tx.ReadFromDisk(COutPoint(hashTx, 0));
      if (AddToWalletIfInvolvingMe(tx, NULL, true, true))
          return 1;
      return 0;
  }
  
  void CWallet::ReacceptWalletTransactions()
  {
      CTxDB txdb("r");
      bool fRepeat = true;
      while (fRepeat)
      {
          LOCK(cs_wallet);
          fRepeat = false;
          vector<CDiskTxPos> vMissingTx;
          BOOST_FOREACH(PAIRTYPE(const uint256, CWalletTx)& item, mapWallet)
          {
              CWalletTx& wtx = item.second;
              if ((wtx.IsCoinBase() && wtx.IsSpent(0)) || (wtx.IsCoinStake() && wtx.IsSpent(1)))
                  continue;
  
              CTxIndex txindex;
              bool fUpdated = false;
              if (txdb.ReadTxIndex(wtx.GetHash(), txindex))
              {
                  // Update fSpent if a tx got spent somewhere else by a copy of wallet.dat
                  if (txindex.vSpent.size() != wtx.vout.size())
                  {
                      printf("ERROR: ReacceptWalletTransactions() : txindex.vSpent.size() %"PRIszu" != wtx.vout.size() %"PRIszu"\n", txindex.vSpent.size(), wtx.vout.size());
                      continue;
                  }
                  for (unsigned int i = 0; i < txindex.vSpent.size(); i++)
                  {
                      if (wtx.IsSpent(i))
                          continue;
                      if (!txindex.vSpent[i].IsNull() && IsMine(wtx.vout[i]))
                      {
                          wtx.MarkSpent(i);
                          fUpdated = true;
                          vMissingTx.push_back(txindex.vSpent[i]);
                      }
                  }
                  if (fUpdated)
                  {
                      printf("ReacceptWalletTransactions found spent coin %snvc %s\n", FormatMoney(wtx.GetCredit()).c_str(), wtx.GetHash().ToString().c_str());
                      wtx.MarkDirty();
                      wtx.WriteToDisk();
                  }
              }
              else
              {
                  // Re-accept any txes of ours that aren't already in a block
                  if (!(wtx.IsCoinBase() || wtx.IsCoinStake()))
                      wtx.AcceptWalletTransaction(txdb, false);
              }
          }
          if (!vMissingTx.empty())
          {
              // TODO: optimize this to scan just part of the block chain?
              if (ScanForWalletTransactions(pindexGenesisBlock))
                  fRepeat = true;  // Found missing transactions: re-do re-accept.
          }
      }
  }
  
  void CWalletTx::RelayWalletTransaction(CTxDB& txdb)
  {
      BOOST_FOREACH(const CMerkleTx& tx, vtxPrev)
      {
          if (!(tx.IsCoinBase() || tx.IsCoinStake()))
          {
              uint256 hash = tx.GetHash();
              if (!txdb.ContainsTx(hash))
                  RelayMessage(CInv(MSG_TX, hash), (CTransaction)tx);
          }
      }
      if (!(IsCoinBase() || IsCoinStake()))
      {
          uint256 hash = GetHash();
          if (!txdb.ContainsTx(hash))
          {
              printf("Relaying wtx %s\n", hash.ToString().substr(0,10).c_str());
              RelayMessage(CInv(MSG_TX, hash), (CTransaction)*this);
          }
      }
  }
  
  void CWalletTx::RelayWalletTransaction()
  {
     CTxDB txdb("r");
     RelayWalletTransaction(txdb);
  }
  
  void CWallet::ResendWalletTransactions()
  {
      // Do this infrequently and randomly to avoid giving away
      // that these are our transactions.
      static int64 nNextTime;
      if (GetTime() < nNextTime)
          return;
      bool fFirst = (nNextTime == 0);
      nNextTime = GetTime() + GetRand(30 * 60);
      if (fFirst)
          return;
  
      // Only do it if there's been a new block since last time
      static int64 nLastTime;
      if (nTimeBestReceived < nLastTime)
          return;
      nLastTime = GetTime();
  
      // Rebroadcast any of our txes that aren't in a block yet
      printf("ResendWalletTransactions()\n");
      CTxDB txdb("r");
      {
          LOCK(cs_wallet);
          // Sort them in chronological order
          multimap<unsigned int, CWalletTx*> mapSorted;
          BOOST_FOREACH(PAIRTYPE(const uint256, CWalletTx)& item, mapWallet)
          {
              CWalletTx& wtx = item.second;
              // Don't rebroadcast until it's had plenty of time that
              // it should have gotten in already by now.
              if (nTimeBestReceived - (int64)wtx.nTimeReceived > 5 * 60)
                  mapSorted.insert(make_pair(wtx.nTimeReceived, &wtx));
          }
          BOOST_FOREACH(PAIRTYPE(const unsigned int, CWalletTx*)& item, mapSorted)
          {
              CWalletTx& wtx = *item.second;
              if (wtx.CheckTransaction())
                  wtx.RelayWalletTransaction(txdb);
              else
                  printf("ResendWalletTransactions() : CheckTransaction failed for transaction %s\n", wtx.GetHash().ToString().c_str());
          }
      }
  }
  
  
  
  
  
  
  //////////////////////////////////////////////////////////////////////////////
  //
  // Actions
  //
  
  
  int64 CWallet::GetBalance() const
  {
      int64 nTotal = 0;
      {
          LOCK(cs_wallet);
          for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
          {
              const CWalletTx* pcoin = &(*it).second;
              if (pcoin->IsFinal() && pcoin->IsConfirmed())
                  nTotal += pcoin->GetAvailableCredit();
          }
      }
  
      return nTotal;
  }
  
  int64 CWallet::GetUnconfirmedBalance() const
  {
      int64 nTotal = 0;
      {
          LOCK(cs_wallet);
          for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
          {
              const CWalletTx* pcoin = &(*it).second;
              if (!pcoin->IsFinal() || !pcoin->IsConfirmed())
                  nTotal += pcoin->GetAvailableCredit();
          }
      }
      return nTotal;
  }
  
  int64 CWallet::GetImmatureBalance() const
  {
      int64 nTotal = 0;
      {
          LOCK(cs_wallet);
          for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
          {
              const CWalletTx& pcoin = (*it).second;
              if (pcoin.IsCoinBase() && pcoin.GetBlocksToMaturity() > 0 && pcoin.IsInMainChain())
                  nTotal += GetCredit(pcoin);
          }
      }
      return nTotal;
  }
  
  // populate vCoins with vector of spendable COutputs
  void CWallet::AvailableCoins(vector<COutput>& vCoins, bool fOnlyConfirmed) const
  {
      vCoins.clear();
  
      {
          LOCK(cs_wallet);
          for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
          {
              const CWalletTx* pcoin = &(*it).second;
  
              if (!pcoin->IsFinal())
                  continue;
  
              if (fOnlyConfirmed && !pcoin->IsConfirmed())
                  continue;
  
              if (pcoin->IsCoinBase() && pcoin->GetBlocksToMaturity() > 0)
                  continue;
  
              if(pcoin->IsCoinStake() && pcoin->GetBlocksToMaturity() > 0)
                  continue;
  
              for (unsigned int i = 0; i < pcoin->vout.size(); i++)
                  if (!(pcoin->IsSpent(i)) && IsMine(pcoin->vout[i]) && pcoin->vout[i].nValue > 0)
                      vCoins.push_back(COutput(pcoin, i, pcoin->GetDepthInMainChain()));
          }
      }
  }
  
  static void ApproximateBestSubset(vector<pair<int64, pair<const CWalletTx*,unsigned int> > >vValue, int64 nTotalLower, int64 nTargetValue,
                                    vector<char>& vfBest, int64& nBest, int iterations = 1000)
  {
      vector<char> vfIncluded;
  
      vfBest.assign(vValue.size(), true);
      nBest = nTotalLower;
  
      for (int nRep = 0; nRep < iterations && nBest != nTargetValue; nRep++)
      {
          vfIncluded.assign(vValue.size(), false);
          int64 nTotal = 0;
          bool fReachedTarget = false;
          for (int nPass = 0; nPass < 2 && !fReachedTarget; nPass++)
          {
              for (unsigned int i = 0; i < vValue.size(); i++)
              {
                  if (nPass == 0 ? rand() % 2 : !vfIncluded[i])
                  {
                      nTotal += vValue[i].first;
                      vfIncluded[i] = true;
                      if (nTotal >= nTargetValue)
                      {
                          fReachedTarget = true;
                          if (nTotal < nBest)
                          {
                              nBest = nTotal;
                              vfBest = vfIncluded;
                          }
                          nTotal -= vValue[i].first;
                          vfIncluded[i] = false;
                      }
                  }
              }
          }
      }
  }
  
  // ppcoin: total coins staked (non-spendable until maturity)
  int64 CWallet::GetStake() const
  {
      int64 nTotal = 0;
      LOCK(cs_wallet);
      for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
      {
          const CWalletTx* pcoin = &(*it).second;
          if (pcoin->IsCoinStake() && pcoin->GetBlocksToMaturity() > 0 && pcoin->GetDepthInMainChain() > 0)
              nTotal += CWallet::GetCredit(*pcoin);
      }
      return nTotal;
  }
  
  int64 CWallet::GetNewMint() const
  {
      int64 nTotal = 0;
      LOCK(cs_wallet);
      for (map<uint256, CWalletTx>::const_iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
      {
          const CWalletTx* pcoin = &(*it).second;
          if (pcoin->IsCoinBase() && pcoin->GetBlocksToMaturity() > 0 && pcoin->GetDepthInMainChain() > 0)
              nTotal += CWallet::GetCredit(*pcoin);
      }
      return nTotal;
  }
  
  bool CWallet::SelectCoinsMinConf(int64 nTargetValue, unsigned int nSpendTime, int nConfMine, int nConfTheirs, vector<COutput> vCoins, set<pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64& nValueRet) const
  {
      setCoinsRet.clear();
      nValueRet = 0;
  
      // List of values less than target
      pair<int64, pair<const CWalletTx*,unsigned int> > coinLowestLarger;
      coinLowestLarger.first = std::numeric_limits<int64>::max();
      coinLowestLarger.second.first = NULL;
      vector<pair<int64, pair<const CWalletTx*,unsigned int> > > vValue;
      int64 nTotalLower = 0;
  
      random_shuffle(vCoins.begin(), vCoins.end(), GetRandInt);
  
      BOOST_FOREACH(COutput output, vCoins)
      {
          const CWalletTx *pcoin = output.tx;
  
          if (output.nDepth < (pcoin->IsFromMe() ? nConfMine : nConfTheirs))
              continue;
  
          int i = output.i;
  
          if (pcoin->nTime > nSpendTime)
              continue;  // ppcoin: timestamp must not exceed spend time
  
          int64 n = pcoin->vout[i].nValue;
  
          pair<int64,pair<const CWalletTx*,unsigned int> > coin = make_pair(n,make_pair(pcoin, i));
  
          if (n == nTargetValue)
          {
              setCoinsRet.insert(coin.second);
              nValueRet += coin.first;
              return true;
          }
          else if (n < nTargetValue + CENT)
          {
              vValue.push_back(coin);
              nTotalLower += n;
          }
          else if (n < coinLowestLarger.first)
          {
              coinLowestLarger = coin;
          }
      }
  
      if (nTotalLower == nTargetValue)
      {
          for (unsigned int i = 0; i < vValue.size(); ++i)
          {
              setCoinsRet.insert(vValue[i].second);
              nValueRet += vValue[i].first;
          }
          return true;
      }
  
      if (nTotalLower < nTargetValue)
      {
          if (coinLowestLarger.second.first == NULL)
              return false;
          setCoinsRet.insert(coinLowestLarger.second);
          nValueRet += coinLowestLarger.first;
          return true;
      }
  
      // Solve subset sum by stochastic approximation
      sort(vValue.rbegin(), vValue.rend(), CompareValueOnly());
      vector<char> vfBest;
      int64 nBest;
  
      ApproximateBestSubset(vValue, nTotalLower, nTargetValue, vfBest, nBest, 1000);
      if (nBest != nTargetValue && nTotalLower >= nTargetValue + CENT)
          ApproximateBestSubset(vValue, nTotalLower, nTargetValue + CENT, vfBest, nBest, 1000);
  
      // If we have a bigger coin and (either the stochastic approximation didn't find a good solution,
      //                                   or the next bigger coin is closer), return the bigger coin
      if (coinLowestLarger.second.first &&
          ((nBest != nTargetValue && nBest < nTargetValue + CENT) || coinLowestLarger.first <= nBest))
      {
          setCoinsRet.insert(coinLowestLarger.second);
          nValueRet += coinLowestLarger.first;
      }
      else {
          for (unsigned int i = 0; i < vValue.size(); i++)
              if (vfBest[i])
              {
                  setCoinsRet.insert(vValue[i].second);
                  nValueRet += vValue[i].first;
              }
  
          if (fDebug && GetBoolArg("-printpriority"))
          {
              //// debug print
              printf("SelectCoins() best subset: ");
              for (unsigned int i = 0; i < vValue.size(); i++)
                  if (vfBest[i])
                      printf("%s ", FormatMoney(vValue[i].first).c_str());
              printf("total %s\n", FormatMoney(nBest).c_str());
          }
      }
  
      return true;
  }
  
  bool CWallet::SelectCoins(int64 nTargetValue, unsigned int nSpendTime, set<pair<const CWalletTx*,unsigned int> >& setCoinsRet, int64& nValueRet) const
  {
      vector<COutput> vCoins;
      AvailableCoins(vCoins);
  
      return (SelectCoinsMinConf(nTargetValue, nSpendTime, 1, 6, vCoins, setCoinsRet, nValueRet) ||
              SelectCoinsMinConf(nTargetValue, nSpendTime, 1, 1, vCoins, setCoinsRet, nValueRet) ||
              SelectCoinsMinConf(nTargetValue, nSpendTime, 0, 1, vCoins, setCoinsRet, nValueRet));
  }
  
  
  
  
  bool CWallet::CreateTransaction(const vector<pair<CScript, int64> >& vecSend, CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet, std::string strTxComment)
  {
      int64 nValue = 0;
      BOOST_FOREACH (const PAIRTYPE(CScript, int64)& s, vecSend)
      {
          if (nValue < 0)
              return false;
          nValue += s.second;
      }
      if (vecSend.empty() || nValue < 0)
          return false;
  
      wtxNew.BindWallet(this);
  
      // transaction comment
      wtxNew.strTxComment = strTxComment;
      if (wtxNew.strTxComment.length() > MAX_TX_COMMENT_LEN)
          wtxNew.strTxComment.resize(MAX_TX_COMMENT_LEN);
  
  
      {
          LOCK2(cs_main, cs_wallet);
          // txdb must be opened before the mapWallet lock
          CTxDB txdb("r");
          {
              nFeeRet = nTransactionFee;
              loop
              {
                  wtxNew.vin.clear();
                  wtxNew.vout.clear();
                  wtxNew.fFromMe = true;
  
                  int64 nTotalValue = nValue + nFeeRet;
                  double dPriority = 0;
                  // vouts to the payees
                  BOOST_FOREACH (const PAIRTYPE(CScript, int64)& s, vecSend)
                      wtxNew.vout.push_back(CTxOut(s.second, s.first));
  
                  // Choose coins to use
                  set<pair<const CWalletTx*,unsigned int> > setCoins;
                  int64 nValueIn = 0;
                  if (!SelectCoins(nTotalValue, wtxNew.nTime, setCoins, nValueIn))
                      return false;
                  BOOST_FOREACH(PAIRTYPE(const CWalletTx*, unsigned int) pcoin, setCoins)
                  {
                      int64 nCredit = pcoin.first->vout[pcoin.second].nValue;
                      dPriority += (double)nCredit * pcoin.first->GetDepthInMainChain();
                  }
  
                  int64 nChange = nValueIn - nValue - nFeeRet;
                  // if sub-cent change is required, the fee must be raised to at least MIN_TX_FEE
                  // or until nChange becomes zero
                  // NOTE: this depends on the exact behaviour of GetMinFee
                  if (nFeeRet < MIN_TX_FEE && nChange > 0 && nChange < CENT)
                  {
                      int64 nMoveToFee = min(nChange, MIN_TX_FEE - nFeeRet);
                      nChange -= nMoveToFee;
                      nFeeRet += nMoveToFee;
                  }
  
                  // ppcoin: sub-cent change is moved to fee
                  if (nChange > 0 && nChange < MIN_TXOUT_AMOUNT)
                  {
                      nFeeRet += nChange;
                      nChange = 0;
                  }
  
                  if (nChange > 0)
                  {
                      // Note: We use a new key here to keep it from being obvious which side is the change.
                      //  The drawback is that by not reusing a previous key, the change may be lost if a
                      //  backup is restored, if the backup doesn't have the new private key for the change.
                      //  If we reused the old key, it would be possible to add code to look for and
                      //  rediscover unknown transactions that were written with keys of ours to recover
                      //  post-backup change.
  
                      // Reserve a new key pair from key pool
                      CPubKey vchPubKey = reservekey.GetReservedKey();
                      // assert(mapKeys.count(vchPubKey));
  
                      // Fill a vout to ourself
                      // TODO: pass in scriptChange instead of reservekey so
                      // change transaction isn't always pay-to-bitcoinbuck-address
                      CScript scriptChange;
                      scriptChange.SetDestination(vchPubKey.GetID());
  
                      // Insert change txn at random position:
                      vector<CTxOut>::iterator position = wtxNew.vout.begin()+GetRandInt(wtxNew.vout.size());
                      wtxNew.vout.insert(position, CTxOut(nChange, scriptChange));
                  }
                  else
                      reservekey.ReturnKey();
  
                  // Fill vin
                  BOOST_FOREACH(const PAIRTYPE(const CWalletTx*,unsigned int)& coin, setCoins)
                      wtxNew.vin.push_back(CTxIn(coin.first->GetHash(),coin.second));
  
                  // Sign
                  int nIn = 0;
                  BOOST_FOREACH(const PAIRTYPE(const CWalletTx*,unsigned int)& coin, setCoins)
                      if (!SignSignature(*this, *coin.first, wtxNew, nIn++))
                          return false;
  
                  // Limit size
                  unsigned int nBytes = ::GetSerializeSize(*(CTransaction*)&wtxNew, SER_NETWORK, PROTOCOL_VERSION);
                  if (nBytes >= MAX_BLOCK_SIZE_GEN/5)
                      return false;
                  dPriority /= nBytes;
  
                  // Check that enough fee is included
                  int64 nPayFee = nTransactionFee * (1 + (int64)nBytes / 1000);
                  int64 nMinFee = wtxNew.GetMinFee(1, false, GMF_SEND);
  
                  if (nFeeRet < max(nPayFee, nMinFee))
                  {
                      nFeeRet = max(nPayFee, nMinFee);
                      continue;
                  }
  
                  // Fill vtxPrev by copying from previous transactions vtxPrev
                  wtxNew.AddSupportingTransactions(txdb);
                  wtxNew.fTimeReceivedIsTxTime = true;
  
                  break;
              }
          }
      }
      return true;
  }
  
  bool CWallet::CreateTransaction(CScript scriptPubKey, int64 nValue, CWalletTx& wtxNew, CReserveKey& reservekey, int64& nFeeRet, std::string strTxComment)
  {
      vector< pair<CScript, int64> > vecSend;
      vecSend.push_back(make_pair(scriptPubKey, nValue));
      return CreateTransaction(vecSend, wtxNew, reservekey, nFeeRet, strTxComment);
  }
  
  // ppcoin: create coin stake transaction
  bool CWallet::CreateCoinStake(const CKeyStore& keystore, unsigned int nBits, int64 nSearchInterval, CTransaction& txNew)
  {
      // The following split & combine thresholds are important to security
      // Should not be adjusted if you don't understand the consequences
      static unsigned int nStakeSplitAge = (60 * 60 * 24 * 90);
      const CBlockIndex* pIndex0 = GetLastBlockIndex(pindexBest, false);
      int64 nCombineThreshold = 0;
      if(pIndex0->pprev)
          nCombineThreshold = GetProofOfWorkReward(pIndex0->nHeight, MIN_TX_FEE, pIndex0->pprev->GetBlockHash()) / 3;
  
      CBigNum bnTargetPerCoinDay;
      bnTargetPerCoinDay.SetCompact(nBits);
  
      LOCK2(cs_main, cs_wallet);
      txNew.vin.clear();
      txNew.vout.clear();
      // Mark coin stake transaction
      CScript scriptEmpty;
      scriptEmpty.clear();
      txNew.vout.push_back(CTxOut(0, scriptEmpty));
      // Choose coins to use
      int64 nBalance = GetBalance();
      int64 nReserveBalance = 0;
      if (mapArgs.count("-reservebalance") && !ParseMoney(mapArgs["-reservebalance"], nReserveBalance))
          return error("CreateCoinStake : invalid reserve balance amount");
      if (nBalance <= nReserveBalance)
          return false;
      set<pair<const CWalletTx*,unsigned int> > setCoins;
      vector<const CWalletTx*> vwtxPrev;
      int64 nValueIn = 0;
      if (!SelectCoins(nBalance - nReserveBalance, txNew.nTime, setCoins, nValueIn))
          return false;
      if (setCoins.empty())
          return false;
      int64 nCredit = 0;
      CScript scriptPubKeyKernel;
      BOOST_FOREACH(PAIRTYPE(const CWalletTx*, unsigned int) pcoin, setCoins)
      {
          CTxDB txdb("r");
          CTxIndex txindex;
          if (!txdb.ReadTxIndex(pcoin.first->GetHash(), txindex))
              continue;
  
          // Read block header
          CBlock block;
          if (!block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
              continue;
          static int nMaxStakeSearchInterval = 60;
          if (block.GetBlockTime() + nStakeMinAge > txNew.nTime - nMaxStakeSearchInterval)
              continue; // only count coins meeting min age requirement
  
          bool fKernelFound = false;
          for (unsigned int n=0; n<min(nSearchInterval,(int64)nMaxStakeSearchInterval) && !fKernelFound && !fShutdown; n++)
          {
              // Search backward in time from the given txNew timestamp 
              // Search nSearchInterval seconds back up to nMaxStakeSearchInterval
              uint256 hashProofOfStake = 0;
              COutPoint prevoutStake = COutPoint(pcoin.first->GetHash(), pcoin.second);
              if (CheckStakeKernelHash(nBits, block, txindex.pos.nTxPos - txindex.pos.nBlockPos, *pcoin.first, prevoutStake, txNew.nTime - n, hashProofOfStake))
              {
                  // Found a kernel
                  if (fDebug && GetBoolArg("-printcoinstake"))
                      printf("CreateCoinStake : kernel found\n");
                  vector<valtype> vSolutions;
                  txnouttype whichType;
                  CScript scriptPubKeyOut;
                  scriptPubKeyKernel = pcoin.first->vout[pcoin.second].scriptPubKey;
                  if (!Solver(scriptPubKeyKernel, whichType, vSolutions))
                  {
                      if (fDebug && GetBoolArg("-printcoinstake"))
                          printf("CreateCoinStake : failed to parse kernel\n");
                      break;
                  }
                  if (fDebug && GetBoolArg("-printcoinstake"))
                      printf("CreateCoinStake : parsed kernel type=%d\n", whichType);
                  if (whichType != TX_PUBKEY && whichType != TX_PUBKEYHASH)
                  {
                      if (fDebug && GetBoolArg("-printcoinstake"))
                          printf("CreateCoinStake : no support for kernel type=%d\n", whichType);
                      break;  // only support pay to public key and pay to address
                  }
                  if (whichType == TX_PUBKEYHASH) // pay to address type
                  {
                      // convert to pay to public key type
                      CKey key;
                      if (!keystore.GetKey(uint160(vSolutions[0]), key))
                      {
                          if (fDebug && GetBoolArg("-printcoinstake"))
                              printf("CreateCoinStake : failed to get key for kernel type=%d\n", whichType);
                          break;  // unable to find corresponding public key
                      }
                      scriptPubKeyOut << key.GetPubKey() << OP_CHECKSIG;
                  }
                  else
                      scriptPubKeyOut = scriptPubKeyKernel;
  
                  txNew.nTime -= n; 
                  txNew.vin.push_back(CTxIn(pcoin.first->GetHash(), pcoin.second));
                  nCredit += pcoin.first->vout[pcoin.second].nValue;
                  vwtxPrev.push_back(pcoin.first);
                  txNew.vout.push_back(CTxOut(0, scriptPubKeyOut));
                  if (block.GetBlockTime() + nStakeSplitAge > txNew.nTime)
                      txNew.vout.push_back(CTxOut(0, scriptPubKeyOut)); //split stake
                  if (fDebug && GetBoolArg("-printcoinstake"))
                      printf("CreateCoinStake : added kernel type=%d\n", whichType);
                  fKernelFound = true;
                  break;
              }
          }
          if (fKernelFound || fShutdown)
              break; // if kernel is found stop searching
      }
      if (nCredit == 0 || nCredit > nBalance - nReserveBalance)
          return false;
      BOOST_FOREACH(PAIRTYPE(const CWalletTx*, unsigned int) pcoin, setCoins)
      {
          // Attempt to add more inputs
          // Only add coins of the same key/address as kernel
          if (txNew.vout.size() == 2 && ((pcoin.first->vout[pcoin.second].scriptPubKey == scriptPubKeyKernel || pcoin.first->vout[pcoin.second].scriptPubKey == txNew.vout[1].scriptPubKey))
              && pcoin.first->GetHash() != txNew.vin[0].prevout.hash)
          {
              // Stop adding more inputs if already too many inputs
              if (txNew.vin.size() >= 100)
                  break;
              // Stop adding more inputs if value is already pretty significant
              if (nCredit > nCombineThreshold)
                  break;
              // Stop adding inputs if reached reserve limit
              if (nCredit + pcoin.first->vout[pcoin.second].nValue > nBalance - nReserveBalance)
                  break;
              // Do not add additional significant input
              if (pcoin.first->vout[pcoin.second].nValue > nCombineThreshold)
                  continue;
              // Do not add input that is still too young
              if (pcoin.first->nTime + nStakeMaxAge > txNew.nTime)
                  continue;
              txNew.vin.push_back(CTxIn(pcoin.first->GetHash(), pcoin.second));
              nCredit += pcoin.first->vout[pcoin.second].nValue;
              vwtxPrev.push_back(pcoin.first);
          }
      }
      // Calculate coin age reward
      {
          uint64 nCoinAge;
          CTxDB txdb("r");
          if (!txNew.GetCoinAge(txdb, nCoinAge))
              return error("CreateCoinStake : failed to calculate coin age");
          nCredit += GetProofOfStakeReward(nCoinAge, nBits, txNew.nTime);
      }
  
      int64 nMinFee = 0;
      loop
      {
          // Set output amount
          if (txNew.vout.size() == 3)
          {
              if( GetLastBlockIndex(pindexBest, false)->nHeight > 14200 ) // Fix rounded
                   txNew.vout[1].nValue = ((nCredit - nMinFee) / 2 );
               else
                   txNew.vout[1].nValue = ((nCredit - nMinFee) / 2 / CENT ) * CENT;
              txNew.vout[2].nValue = nCredit - nMinFee - txNew.vout[1].nValue;
          }
          else
              txNew.vout[1].nValue = nCredit - nMinFee;
  
          // Sign
          int nIn = 0;
          BOOST_FOREACH(const CWalletTx* pcoin, vwtxPrev)
          {
              if (!SignSignature(*this, *pcoin, txNew, nIn++))
                  return error("CreateCoinStake : failed to sign coinstake");
          }
  
          // Limit size
          unsigned int nBytes = ::GetSerializeSize(txNew, SER_NETWORK, PROTOCOL_VERSION);
          if (nBytes >= MAX_BLOCK_SIZE_GEN/5)
              return error("CreateCoinStake : exceeded coinstake size limit");
  
          // Check enough fee is paid
          if (nMinFee < txNew.GetMinFee() - MIN_TX_FEE)
          {
              nMinFee = txNew.GetMinFee() - MIN_TX_FEE;
              continue; // try signing again
          }
          else
          {
              if (fDebug && GetBoolArg("-printfee"))
                  printf("CreateCoinStake : fee for coinstake %s\n", FormatMoney(nMinFee).c_str());
              break;
          }
      }
  
      // Successfully generated coinstake
      return true;
  }
  
  
  // Call after CreateTransaction unless you want to abort
  bool CWallet::CommitTransaction(CWalletTx& wtxNew, CReserveKey& reservekey)
  {
      {
          LOCK2(cs_main, cs_wallet);
          printf("CommitTransaction:\n%s", wtxNew.ToString().c_str());
          {
              // This is only to keep the database open to defeat the auto-flush for the
              // duration of this scope.  This is the only place where this optimization
              // maybe makes sense; please don't do it anywhere else.
              CWalletDB* pwalletdb = fFileBacked ? new CWalletDB(strWalletFile,"r") : NULL;
  
              // Take key pair from key pool so it won't be used again
              reservekey.KeepKey();
  
              // Add tx to wallet, because if it has change it's also ours,
              // otherwise just for transaction history.
              AddToWallet(wtxNew);
  
              // Mark old coins as spent
              set<CWalletTx*> setCoins;
              BOOST_FOREACH(const CTxIn& txin, wtxNew.vin)
              {
                  CWalletTx &coin = mapWallet[txin.prevout.hash];
                  coin.BindWallet(this);
                  coin.MarkSpent(txin.prevout.n);
                  coin.WriteToDisk();
                  NotifyTransactionChanged(this, coin.GetHash(), CT_UPDATED);
              }
  
              if (fFileBacked)
                  delete pwalletdb;
          }
  
          // Track how many getdata requests our transaction gets
          mapRequestCount[wtxNew.GetHash()] = 0;
  
          // Broadcast
          if (!wtxNew.AcceptToMemoryPool())
          {
              // This must not fail. The transaction has already been signed and recorded.
              printf("CommitTransaction() : Error: Transaction not valid");
              return false;
          }
          wtxNew.RelayWalletTransaction();
      }
      return true;
  }
  
  
  
  
  string CWallet::SendMoney(CScript scriptPubKey, int64 nValue, CWalletTx& wtxNew, bool fAskFee, std::string strTxComment)
  {
      CReserveKey reservekey(this);
      int64 nFeeRequired;
  
      if (IsLocked())
      {
          string strError = _("Error: Wallet locked, unable to create transaction  ");
          printf("SendMoney() : %s", strError.c_str());
          return strError;
      }
      if (fWalletUnlockMintOnly)
      {
          string strError = _("Error: Wallet unlocked for block minting only, unable to create transaction.");
          printf("SendMoney() : %s", strError.c_str());
          return strError;
      }
      if (!CreateTransaction(scriptPubKey, nValue, wtxNew, reservekey, nFeeRequired, strTxComment))
      {
          string strError;
          if (nValue + nFeeRequired > GetBalance())
              strError = strprintf(_("Error: This transaction requires a transaction fee of at least %s because of its amount, complexity, or use of recently received funds  "), FormatMoney(nFeeRequired).c_str());
          else
              strError = _("Error: Transaction creation failed  ");
          printf("SendMoney() : %s", strError.c_str());
          return strError;
      }
  
      if (fAskFee && !uiInterface.ThreadSafeAskFee(nFeeRequired, _("Sending...")))
          return "ABORTED";
  
      if (!CommitTransaction(wtxNew, reservekey))
          return _("Error: The transaction was rejected.  This might happen if some of the coins in your wallet were already spent, such as if you used a copy of wallet.dat and coins were spent in the copy but not marked as spent here.");
  
      return "";
  }
  
  
  
  string CWallet::SendMoneyToDestination(const CTxDestination& address, int64 nValue, CWalletTx& wtxNew, bool fAskFee, std::string strTxComment)
  {
      // Check amount
      if (nValue <= 0)
          return _("Invalid amount");
      if (nValue + nTransactionFee > GetBalance())
          return _("Insufficient funds");
  
      // Parse Bitcoinbuck address
      CScript scriptPubKey;
      scriptPubKey.SetDestination(address);
  
      return SendMoney(scriptPubKey, nValue, wtxNew, fAskFee, strTxComment);
  }
  
  
  
  
  DBErrors CWallet::LoadWallet(bool& fFirstRunRet)
  {
      if (!fFileBacked)
          return DB_LOAD_OK;
      fFirstRunRet = false;
      DBErrors nLoadWalletRet = CWalletDB(strWalletFile,"cr+").LoadWallet(this);
      if (nLoadWalletRet == DB_NEED_REWRITE)
      {
          if (CDB::Rewrite(strWalletFile, "\x04pool"))
          {
              setKeyPool.clear();
              // Note: can't top-up keypool here, because wallet is locked.
              // User will be prompted to unlock wallet the next operation
              // the requires a new key.
          }
      }
  
      if (nLoadWalletRet != DB_LOAD_OK)
          return nLoadWalletRet;
      fFirstRunRet = !vchDefaultKey.IsValid();
  
      NewThread(ThreadFlushWalletDB, &strWalletFile);
      return DB_LOAD_OK;
  }
  
  
  bool CWallet::SetAddressBookName(const CTxDestination& address, const string& strName)
  {
      std::map<CTxDestination, std::string>::iterator mi = mapAddressBook.find(address);
      mapAddressBook[address] = strName;
      NotifyAddressBookChanged(this, address, strName, ::IsMine(*this, address), (mi == mapAddressBook.end()) ? CT_NEW : CT_UPDATED);
      if (!fFileBacked)
          return false;
      return CWalletDB(strWalletFile).WriteName(CBitcoinbuckAddress(address).ToString(), strName);
  }
  
  bool CWallet::DelAddressBookName(const CTxDestination& address)
  {
      mapAddressBook.erase(address);
      NotifyAddressBookChanged(this, address, "", ::IsMine(*this, address), CT_DELETED);
      if (!fFileBacked)
          return false;
      return CWalletDB(strWalletFile).EraseName(CBitcoinbuckAddress(address).ToString());
  }
  
  
  void CWallet::PrintWallet(const CBlock& block)
  {
      {
          LOCK(cs_wallet);
          if (block.IsProofOfWork() && mapWallet.count(block.vtx[0].GetHash()))
          {
              CWalletTx& wtx = mapWallet[block.vtx[0].GetHash()];
              printf("    mine:  %d  %d  %"PRI64d"", wtx.GetDepthInMainChain(), wtx.GetBlocksToMaturity(), wtx.GetCredit());
          }
          if (block.IsProofOfStake() && mapWallet.count(block.vtx[1].GetHash()))
          {
              CWalletTx& wtx = mapWallet[block.vtx[1].GetHash()];
              printf("    stake: %d  %d  %"PRI64d"", wtx.GetDepthInMainChain(), wtx.GetBlocksToMaturity(), wtx.GetCredit());
           }
  
      }
      printf("\n");
  }
  
  bool CWallet::GetTransaction(const uint256 &hashTx, CWalletTx& wtx)
  {
      {
          LOCK(cs_wallet);
          map<uint256, CWalletTx>::iterator mi = mapWallet.find(hashTx);
          if (mi != mapWallet.end())
          {
              wtx = (*mi).second;
              return true;
          }
      }
      return false;
  }
  
  bool CWallet::SetDefaultKey(const CPubKey &vchPubKey)
  {
      if (fFileBacked)
      {
          if (!CWalletDB(strWalletFile).WriteDefaultKey(vchPubKey))
              return false;
      }
      vchDefaultKey = vchPubKey;
      return true;
  }
  
  bool GetWalletFile(CWallet* pwallet, string &strWalletFileOut)
  {
      if (!pwallet->fFileBacked)
          return false;
      strWalletFileOut = pwallet->strWalletFile;
      return true;
  }
  
  //
  // Mark old keypool keys as used,
  // and generate all new keys
  //
  bool CWallet::NewKeyPool()
  {
      {
          LOCK(cs_wallet);
          CWalletDB walletdb(strWalletFile);
          BOOST_FOREACH(int64 nIndex, setKeyPool)
              walletdb.ErasePool(nIndex);
          setKeyPool.clear();
  
          if (IsLocked())
              return false;
  
          int64 nKeys = max(GetArg("-keypool", 100), (int64)0);
          for (int i = 0; i < nKeys; i++)
          {
              int64 nIndex = i+1;
              walletdb.WritePool(nIndex, CKeyPool(GenerateNewKey()));
              setKeyPool.insert(nIndex);
          }
          printf("CWallet::NewKeyPool wrote %"PRI64d" new keys\n", nKeys);
      }
      return true;
  }
  
  bool CWallet::TopUpKeyPool()
  {
      {
          LOCK(cs_wallet);
  
          if (IsLocked())
              return false;
  
          CWalletDB walletdb(strWalletFile);
  
          // Top up key pool
          unsigned int nTargetSize = max(GetArg("-keypool", 100), 0LL);
          while (setKeyPool.size() < (nTargetSize + 1))
          {
              int64 nEnd = 1;
              if (!setKeyPool.empty())
                  nEnd = *(--setKeyPool.end()) + 1;
              if (!walletdb.WritePool(nEnd, CKeyPool(GenerateNewKey())))
                  throw runtime_error("TopUpKeyPool() : writing generated key failed");
              setKeyPool.insert(nEnd);
              printf("keypool added key %"PRI64d", size=%"PRIszu"\n", nEnd, setKeyPool.size());
          }
      }
      return true;
  }
  
  void CWallet::ReserveKeyFromKeyPool(int64& nIndex, CKeyPool& keypool)
  {
      nIndex = -1;
      keypool.vchPubKey = CPubKey();
      {
          LOCK(cs_wallet);
  
          if (!IsLocked())
              TopUpKeyPool();
  
          // Get the oldest key
          if(setKeyPool.empty())
              return;
  
          CWalletDB walletdb(strWalletFile);
  
          nIndex = *(setKeyPool.begin());
          setKeyPool.erase(setKeyPool.begin());
          if (!walletdb.ReadPool(nIndex, keypool))
              throw runtime_error("ReserveKeyFromKeyPool() : read failed");
          if (!HaveKey(keypool.vchPubKey.GetID()))
              throw runtime_error("ReserveKeyFromKeyPool() : unknown key in key pool");
          assert(keypool.vchPubKey.IsValid());
          if (fDebug && GetBoolArg("-printkeypool"))
              printf("keypool reserve %"PRI64d"\n", nIndex);
      }
  }
  
  int64 CWallet::AddReserveKey(const CKeyPool& keypool)
  {
      {
          LOCK2(cs_main, cs_wallet);
          CWalletDB walletdb(strWalletFile);
  
          int64 nIndex = 1 + *(--setKeyPool.end());
          if (!walletdb.WritePool(nIndex, keypool))
              throw runtime_error("AddReserveKey() : writing added key failed");
          setKeyPool.insert(nIndex);
          return nIndex;
      }
      return -1;
  }
  
  void CWallet::KeepKey(int64 nIndex)
  {
      // Remove from key pool
      if (fFileBacked)
      {
          CWalletDB walletdb(strWalletFile);
          walletdb.ErasePool(nIndex);
      }
      if(fDebug)
          printf("keypool keep %"PRI64d"\n", nIndex);
  }
  
  void CWallet::ReturnKey(int64 nIndex)
  {
      // Return to key pool
      {
          LOCK(cs_wallet);
          setKeyPool.insert(nIndex);
      }
      if(fDebug)
          printf("keypool return %"PRI64d"\n", nIndex);
  }
  
  bool CWallet::GetKeyFromPool(CPubKey& result, bool fAllowReuse)
  {
      int64 nIndex = 0;
      CKeyPool keypool;
      {
          LOCK(cs_wallet);
          ReserveKeyFromKeyPool(nIndex, keypool);
          if (nIndex == -1)
          {
              if (fAllowReuse && vchDefaultKey.IsValid())
              {
                  result = vchDefaultKey;
                  return true;
              }
              if (IsLocked()) return false;
              result = GenerateNewKey();
              return true;
          }
          KeepKey(nIndex);
          result = keypool.vchPubKey;
      }
      return true;
  }
  
  int64 CWallet::GetOldestKeyPoolTime()
  {
      int64 nIndex = 0;
      CKeyPool keypool;
      ReserveKeyFromKeyPool(nIndex, keypool);
      if (nIndex == -1)
          return GetTime();
      ReturnKey(nIndex);
      return keypool.nTime;
  }
  
  std::map<CTxDestination, int64> CWallet::GetAddressBalances()
  {
      map<CTxDestination, int64> balances;
  
      {
          LOCK(cs_wallet);
          BOOST_FOREACH(PAIRTYPE(uint256, CWalletTx) walletEntry, mapWallet)
          {
              CWalletTx *pcoin = &walletEntry.second;
  
              if (!pcoin->IsFinal() || !pcoin->IsConfirmed())
                  continue;
  
              if ((pcoin->IsCoinBase() || pcoin->IsCoinStake()) && pcoin->GetBlocksToMaturity() > 0)
                  continue;
  
              int nDepth = pcoin->GetDepthInMainChain();
              if (nDepth < (pcoin->IsFromMe() ? 0 : 1))
                  continue;
  
              for (unsigned int i = 0; i < pcoin->vout.size(); i++)
              {
                  CTxDestination addr;
                  if (!IsMine(pcoin->vout[i]))
                      continue;
                  if(!ExtractDestination(pcoin->vout[i].scriptPubKey, addr))
                      continue;
  
                  int64 n = pcoin->IsSpent(i) ? 0 : pcoin->vout[i].nValue;
  
                  if (!balances.count(addr))
                      balances[addr] = 0;
                  balances[addr] += n;
              }
          }
      }
  
      return balances;
  }
  
  set< set<CTxDestination> > CWallet::GetAddressGroupings()
  {
      set< set<CTxDestination> > groupings;
      set<CTxDestination> grouping;
  
      BOOST_FOREACH(PAIRTYPE(uint256, CWalletTx) walletEntry, mapWallet)
      {
          CWalletTx *pcoin = &walletEntry.second;
  
          if (pcoin->vin.size() > 0 && IsMine(pcoin->vin[0]))
          {
              // group all input addresses with each other
              BOOST_FOREACH(CTxIn txin, pcoin->vin)
              {
                  CTxDestination address;
                  if(!ExtractDestination(mapWallet[txin.prevout.hash].vout[txin.prevout.n].scriptPubKey, address))
                      continue;
                  grouping.insert(address);
              }
  
              // group change with input addresses
              BOOST_FOREACH(CTxOut txout, pcoin->vout)
                  if (IsChange(txout))
                  {
                      CWalletTx tx = mapWallet[pcoin->vin[0].prevout.hash];
                      CTxDestination txoutAddr;
                      if(!ExtractDestination(txout.scriptPubKey, txoutAddr))
                          continue;
                      grouping.insert(txoutAddr);
                  }
              groupings.insert(grouping);
              grouping.clear();
          }
  
          // group lone addrs by themselves
          for (unsigned int i = 0; i < pcoin->vout.size(); i++)
              if (IsMine(pcoin->vout[i]))
              {
                  CTxDestination address;
                  if(!ExtractDestination(pcoin->vout[i].scriptPubKey, address))
                      continue;
                  grouping.insert(address);
                  groupings.insert(grouping);
                  grouping.clear();
              }
      }
  
      set< set<CTxDestination>* > uniqueGroupings; // a set of pointers to groups of addresses
      map< CTxDestination, set<CTxDestination>* > setmap;  // map addresses to the unique group containing it
      BOOST_FOREACH(set<CTxDestination> grouping, groupings)
      {
          // make a set of all the groups hit by this new group
          set< set<CTxDestination>* > hits;
          map< CTxDestination, set<CTxDestination>* >::iterator it;
          BOOST_FOREACH(CTxDestination address, grouping)
              if ((it = setmap.find(address)) != setmap.end())
                  hits.insert((*it).second);
  
          // merge all hit groups into a new single group and delete old groups
          set<CTxDestination>* merged = new set<CTxDestination>(grouping);
          BOOST_FOREACH(set<CTxDestination>* hit, hits)
          {
              merged->insert(hit->begin(), hit->end());
              uniqueGroupings.erase(hit);
              delete hit;
          }
          uniqueGroupings.insert(merged);
  
          // update setmap
          BOOST_FOREACH(CTxDestination element, *merged)
              setmap[element] = merged;
      }
  
      set< set<CTxDestination> > ret;
      BOOST_FOREACH(set<CTxDestination>* uniqueGrouping, uniqueGroupings)
      {
          ret.insert(*uniqueGrouping);
          delete uniqueGrouping;
      }
  
      return ret;
  }
  
  // ppcoin: check 'spent' consistency between wallet and txindex
  // ppcoin: fix wallet spent state according to txindex
  void CWallet::FixSpentCoins(int& nMismatchFound, int64& nBalanceInQuestion, bool fCheckOnly)
  {
      nMismatchFound = 0;
      nBalanceInQuestion = 0;
  
      LOCK(cs_wallet);
      vector<CWalletTx*> vCoins;
      vCoins.reserve(mapWallet.size());
      for (map<uint256, CWalletTx>::iterator it = mapWallet.begin(); it != mapWallet.end(); ++it)
          vCoins.push_back(&(*it).second);
  
      CTxDB txdb("r");
      BOOST_FOREACH(CWalletTx* pcoin, vCoins)
      {
          // Find the corresponding transaction index
          CTxIndex txindex;
          if (!txdb.ReadTxIndex(pcoin->GetHash(), txindex))
              continue;
          for (unsigned int n=0; n < pcoin->vout.size(); n++)
          {
              if (IsMine(pcoin->vout[n]) && pcoin->IsSpent(n) && (txindex.vSpent.size() <= n || txindex.vSpent[n].IsNull()))
              {
                  printf("FixSpentCoins found lost coin %sppc %s[%d], %s\n",
                      FormatMoney(pcoin->vout[n].nValue).c_str(), pcoin->GetHash().ToString().c_str(), n, fCheckOnly? "repair not attempted" : "repairing");
                  nMismatchFound++;
                  nBalanceInQuestion += pcoin->vout[n].nValue;
                  if (!fCheckOnly)
                  {
                      pcoin->MarkUnspent(n);
                      pcoin->WriteToDisk();
                  }
              }
              else if (IsMine(pcoin->vout[n]) && !pcoin->IsSpent(n) && (txindex.vSpent.size() > n && !txindex.vSpent[n].IsNull()))
              {
                  printf("FixSpentCoins found spent coin %sppc %s[%d], %s\n",
                      FormatMoney(pcoin->vout[n].nValue).c_str(), pcoin->GetHash().ToString().c_str(), n, fCheckOnly? "repair not attempted" : "repairing");
                  nMismatchFound++;
                  nBalanceInQuestion += pcoin->vout[n].nValue;
                  if (!fCheckOnly)
                  {
                      pcoin->MarkSpent(n);
                      pcoin->WriteToDisk();
                  }
              }
          }
      }
  }
  
  // ppcoin: disable transaction (only for coinstake)
  void CWallet::DisableTransaction(const CTransaction &tx)
  {
      if (!tx.IsCoinStake() || !IsFromMe(tx))
          return; // only disconnecting coinstake requires marking input unspent
  
      LOCK(cs_wallet);
      BOOST_FOREACH(const CTxIn& txin, tx.vin)
      {
          map<uint256, CWalletTx>::iterator mi = mapWallet.find(txin.prevout.hash);
          if (mi != mapWallet.end())
          {
              CWalletTx& prev = (*mi).second;
              if (txin.prevout.n < prev.vout.size() && IsMine(prev.vout[txin.prevout.n]))
              {
                  prev.MarkUnspent(txin.prevout.n);
                  prev.WriteToDisk();
              }
          }
      }
  }
  
  CPubKey CReserveKey::GetReservedKey()
  {
      if (nIndex == -1)
      {
          CKeyPool keypool;
          pwallet->ReserveKeyFromKeyPool(nIndex, keypool);
          if (nIndex != -1)
              vchPubKey = keypool.vchPubKey;
          else
          {
              printf("CReserveKey::GetReservedKey(): Warning: Using default key instead of a new key, top up your keypool!");
              vchPubKey = pwallet->vchDefaultKey;
          }
      }
      assert(vchPubKey.IsValid());
      return vchPubKey;
  }
  
  void CReserveKey::KeepKey()
  {
      if (nIndex != -1)
          pwallet->KeepKey(nIndex);
      nIndex = -1;
      vchPubKey = CPubKey();
  }
  
  void CReserveKey::ReturnKey()
  {
      if (nIndex != -1)
          pwallet->ReturnKey(nIndex);
      nIndex = -1;
      vchPubKey = CPubKey();
  }
  
  void CWallet::GetAllReserveKeys(set<CKeyID>& setAddress)
  {
      setAddress.clear();
  
      CWalletDB walletdb(strWalletFile);
  
      LOCK2(cs_main, cs_wallet);
      BOOST_FOREACH(const int64& id, setKeyPool)
      {
          CKeyPool keypool;
          if (!walletdb.ReadPool(id, keypool))
              throw runtime_error("GetAllReserveKeyHashes() : read failed");
          assert(keypool.vchPubKey.IsValid());
          CKeyID keyID = keypool.vchPubKey.GetID();
          if (!HaveKey(keyID))
              throw runtime_error("GetAllReserveKeyHashes() : unknown key in key pool");
          setAddress.insert(keyID);
      }
  }
  
  void CWallet::UpdatedTransaction(const uint256 &hashTx)
  {
      {
          LOCK(cs_wallet);
          // Only notify UI if this transaction is in this wallet
          map<uint256, CWalletTx>::const_iterator mi = mapWallet.find(hashTx);
          if (mi != mapWallet.end())
              NotifyTransactionChanged(this, hashTx, CT_UPDATED);
      }
  }
  