text: // Copyright (c) 2014-2015 The Darkcoin developers
  // Distributed under the MIT/X11 software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #ifndef DARKSEND_H
  #define DARKSEND_H
  
  //#include "primitives/transaction.h"
  #include "main.h"
  #include "masternode.h"
  #include "activemasternode.h"
  
  class CTxIn;
  class CDarkSendPool;
  class CDarkSendSigner;
  class CMasterNodeVote;
  class CBitcoinAddress;
  class CDarksendQueue;
  class CDarksendBroadcastTx;
  class CActiveMasternode;
  
  #define POOL_MAX_TRANSACTIONS                  3 // wait for X transactions to merge and publish
  #define POOL_STATUS_UNKNOWN                    0 // waiting for update
  #define POOL_STATUS_IDLE                       1 // waiting for update
  #define POOL_STATUS_QUEUE                      2 // waiting in a queue
  #define POOL_STATUS_ACCEPTING_ENTRIES          3 // accepting entries
  #define POOL_STATUS_FINALIZE_TRANSACTION       4 // master node will broadcast what it accepted
  #define POOL_STATUS_SIGNING                    5 // check inputs/outputs, sign final tx
  #define POOL_STATUS_TRANSMISSION               6 // transmit transaction
  #define POOL_STATUS_ERROR                      7 // error
  #define POOL_STATUS_SUCCESS                    8 // success
  
  // status update message constants
  #define MASTERNODE_ACCEPTED                    1
  #define MASTERNODE_REJECTED                    0
  #define MASTERNODE_RESET                       -1
  
  #define DARKSEND_QUEUE_TIMEOUT                 120
  #define DARKSEND_SIGNING_TIMEOUT               30
  
  extern CDarkSendPool darkSendPool;
  extern CDarkSendSigner darkSendSigner;
  extern std::vector<CDarksendQueue> vecDarksendQueue;
  extern std::string strMasterNodePrivKey;
  extern map<uint256, CDarksendBroadcastTx> mapDarksendBroadcastTxes;
  extern CActiveMasternode activeMasternode;
  
  //specific messages for the Darksend protocol
  void ProcessMessageDarksend(CNode* pfrom, std::string& strCommand, CDataStream& vRecv);
  
  // get the darksend chain depth for a given input
  int GetInputDarksendRounds(CTxIn in, int rounds=0);
  
  
  // An input in the darksend pool
  class CDarkSendEntryVin
  {
  public:
      bool isSigSet;
      CTxIn vin;
  
      CDarkSendEntryVin()
      {
          isSigSet = false;
          vin = CTxIn();
      }
  };
  
  // A clients transaction in the darksend pool
  class CDarkSendEntry
  {
  public:
      bool isSet;
      std::vector<CDarkSendEntryVin> sev;
      int64_t amount;
      CTransaction collateral;
      std::vector<CTxOut> vout;
      CTransaction txSupporting;
      int64_t addedTime;
  
      CDarkSendEntry()
      {
          isSet = false;
          collateral = CTransaction();
          amount = 0;
      }
  
      bool Add(const std::vector<CTxIn> vinIn, int64_t amountIn, const CTransaction collateralIn, const std::vector<CTxOut> voutIn)
      {
          if(isSet){return false;}
  
          BOOST_FOREACH(const CTxIn v, vinIn) {
              CDarkSendEntryVin s = CDarkSendEntryVin();
              s.vin = v;
              sev.push_back(s);
          }
          vout = voutIn;
          amount = amountIn;
          collateral = collateralIn;
          isSet = true;
          addedTime = GetTime();
  
          return true;
      }
  
      bool AddSig(const CTxIn& vin)
      {
          BOOST_FOREACH(CDarkSendEntryVin& s, sev) {
              if(s.vin.prevout == vin.prevout && s.vin.nSequence == vin.nSequence){
                  if(s.isSigSet){return false;}
                  s.vin.scriptSig = vin.scriptSig;
                  s.vin.prevPubKey = vin.prevPubKey;
                  s.isSigSet = true;
  
                  return true;
              }
          }
  
          return false;
      }
  
      bool IsExpired()
      {
          return (GetTime() - addedTime) > DARKSEND_QUEUE_TIMEOUT;// 120 seconds
      }
  };
  
  //
  // A currently inprogress darksend merge and denomination information
  //
  class CDarksendQueue
  {
  public:
      CTxIn vin;
      int64_t time;
      int nDenom;
      bool ready; //ready for submit
      std::vector<unsigned char> vchSig;
  
      CDarksendQueue()
      {
          nDenom = 0;
          vin = CTxIn();
          time = 0;
          vchSig.clear();
          ready = false;
      }
  
      ADD_SERIALIZE_METHODS;
  
      template <typename Stream, typename Operation>
      inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion){
  	unsigned int nSerSize = 0;
          READWRITE(nDenom);
          READWRITE(vin);
          READWRITE(time);
          READWRITE(ready);
          READWRITE(vchSig);
      }
  
      bool GetAddress(CService &addr)
      {
          BOOST_FOREACH(CMasterNode mn, vecMasternodes) {
              if(mn.vin == vin){
                  addr = mn.addr;
                  return true;
              }
          }
          return false;
      }
  
      bool GetProtocolVersion(int &protocolVersion)
      {
          BOOST_FOREACH(CMasterNode mn, vecMasternodes) {
              if(mn.vin == vin){
                  protocolVersion = mn.protocolVersion;
                  return true;
              }
          }
          return false;
      }
  
      bool Sign();
      bool Relay();
  
      bool IsExpired()
      {
          return (GetTime() - time) > DARKSEND_QUEUE_TIMEOUT;// 120 seconds
      }
  
      bool CheckSignature();
  
  };
  
  // store darksend tx signature information
  class CDarksendBroadcastTx
  {
  public:
      CTransaction tx;
      CTxIn vin;
      vector<unsigned char> vchSig;
      int64_t sigTime;
  };
  
  //
  // Helper object for signing and checking signatures
  //
  class CDarkSendSigner
  {
  public:
      bool IsVinAssociatedWithPubkey(CTxIn& vin, CPubKey& pubkey);
      bool SetKey(std::string strSecret, std::string& errorMessage, CKey& key, CPubKey& pubkey);
      bool SignMessage(std::string strMessage, std::string& errorMessage, std::vector<unsigned char>& vchSig, CKey key);
      bool VerifyMessage(CPubKey pubkey, std::vector<unsigned char>& vchSig, std::string strMessage, std::string& errorMessage);
  };
  
  class CDarksendSession
  {
  
  };
  
  //
  // Used to keep track of current status of darksend pool
  //
  class CDarkSendPool
  {
  public:
      static const int MIN_PEER_PROTO_VERSION = 60020;
  
      // clients entries
      std::vector<CDarkSendEntry> myEntries;
      // masternode entries
      std::vector<CDarkSendEntry> entries;
      // the finalized transaction ready for signing
      CTransaction finalTransaction;
  
      int64_t lastTimeChanged;
      int64_t lastAutoDenomination;
  
      unsigned int state;
      unsigned int entriesCount;
      unsigned int lastEntryAccepted;
      unsigned int countEntriesAccepted;
  
      // where collateral should be made out to
      CScript collateralPubKey;
  
      std::vector<CTxIn> lockedCoins;
  
      uint256 masterNodeBlockHash;
  
      std::string lastMessage;
      bool completedTransaction;
      bool unitTest;
      CService submittedToMasternode;
  
      int sessionID;
      int sessionDenom; //Users must submit an denom matching this
      int sessionUsers; //N Users have said they'll join
      bool sessionFoundMasternode; //If we've found a compatible masternode
      int64_t sessionTotalValue; //used for autoDenom
      std::vector<CTransaction> vecSessionCollateral;
  
      int cachedLastSuccess;
      int cachedNumBlocks; //used for the overview screen
      int minBlockSpacing; //required blocks between mixes
      CTransaction txCollateral;
  
      int64_t lastNewBlock;
  
      //debugging data
      std::string strAutoDenomResult;
  
      //incremented whenever a DSQ comes through
      int64_t nDsqCount;
  
      CDarkSendPool()
      {
          /* DarkSend uses collateral addresses to trust parties entering the pool
              to behave themselves. If they don't it takes their money. */
  
          cachedLastSuccess = 0;
          cachedNumBlocks = 0;
          unitTest = false;
          txCollateral = CTransaction();
          minBlockSpacing = 1;
          nDsqCount = 0;
          lastNewBlock = 0;
  
          SetNull();
      }
  
      void InitCollateralAddress(){
          std::string strAddress = "";
              strAddress = "ioySFjLiKYdv2D2sWHs2hng2m3MSXQ3e6a";
          SetCollateralAddress(strAddress);
      }
  
      void SetMinBlockSpacing(int minBlockSpacingIn){
          minBlockSpacing = minBlockSpacingIn;
      }
  
      bool SetCollateralAddress(std::string strAddress);
      void Reset();
      void SetNull(bool clearEverything=false);
  
      void UnlockCoins();
  
      bool IsNull() const
      {
          return (state == POOL_STATUS_ACCEPTING_ENTRIES && entries.empty() && myEntries.empty());
      }
  
      int GetState() const
      {
          return state;
      }
  
      int GetEntriesCount() const
      {
          if(fMasterNode){
              return entries.size();
          } else {
              return entriesCount;
          }
      }
  
      int GetLastEntryAccepted() const
      {
          return lastEntryAccepted;
      }
  
      int GetCountEntriesAccepted() const
      {
          return countEntriesAccepted;
      }
  
      int GetMyTransactionCount() const
      {
          return myEntries.size();
      }
  
      void UpdateState(unsigned int newState)
      {
          if (fMasterNode && (newState == POOL_STATUS_ERROR || newState == POOL_STATUS_SUCCESS)){
              LogPrintf("CDarkSendPool::UpdateState() - Can't set state to ERROR or SUCCESS as a masternode. \n");
              return;
          }
  
          LogPrintf("CDarkSendPool::UpdateState() == %d | %d \n", state, newState);
          if(state != newState){
              lastTimeChanged = GetTimeMillis();
              if(fMasterNode) {
                  RelayDarkSendStatus(darkSendPool.sessionID, darkSendPool.GetState(), darkSendPool.GetEntriesCount(), MASTERNODE_RESET);
              }
          }
          state = newState;
      }
  
      int GetMaxPoolTransactions()
      {
  
          //use the production amount
          return POOL_MAX_TRANSACTIONS;
      }
  
      //Do we have enough users to take entries?
      bool IsSessionReady(){
          return sessionUsers >= GetMaxPoolTransactions();
      }
  
      // Are these outputs compatible with other client in the pool?
      bool IsCompatibleWithEntries(std::vector<CTxOut> vout);
      // Is this amount compatible with other client in the pool?
      bool IsCompatibleWithSession(int64_t nAmount, CTransaction txCollateral, std::string& strReason);
  
      // Passively run Darksend in the background according to the configuration in settings (only for QT)
      bool DoAutomaticDenominating(bool fDryRun=false, bool ready=false);
      bool PrepareDarksendDenominate();
  
  
      // check for process in Darksend
      void Check();
      // charge fees to bad actors
      void ChargeFees();
      // rarely charge fees to pay miners
      void ChargeRandomFees();
      void CheckTimeout();
      // check to make sure a signature matches an input in the pool
      bool SignatureValid(const CScript& newSig, const CTxIn& newVin);
      // if the collateral is valid given by a client
      bool IsCollateralValid(const CTransaction& txCollateral);
      // add a clients entry to the pool
      bool AddEntry(const std::vector<CTxIn>& newInput, const int64_t& nAmount, const CTransaction& txCollateral, const std::vector<CTxOut>& newOutput, std::string& error);
      // add signature to a vin
      bool AddScriptSig(const CTxIn newVin);
      // are all inputs signed?
      bool SignaturesComplete();
      // as a client, send a transaction to a masternode to start the denomination process
      void SendDarksendDenominate(std::vector<CTxIn>& vin, std::vector<CTxOut>& vout, int64_t amount);
      // get masternode updates about the progress of darksend
      bool StatusUpdate(int newState, int newEntriesCount, int newAccepted, std::string& error, int newSessionID=0);
  
      // as a client, check and sign the final transaction
      bool SignFinalTransaction(CTransaction& finalTransactionNew, CNode* node);
  
      // get the last valid block hash for a given modulus
      bool GetLastValidBlockHash(uint256& hash, int mod=1, int nBlockHeight=0);
      // process a new block
      void NewBlock();
      void CompletedTransaction(bool error, std::string lastMessageNew);
      void ClearLastMessage();
      // used for liquidity providers
      bool SendRandomPaymentToSelf();
      // split up large inputs or make fee sized inputs
      bool MakeCollateralAmounts();
      bool CreateDenominated(int64_t nTotalValue);
      // get the denominations for a list of outputs (returns a bitshifted integer)
      int GetDenominations(const std::vector<CTxOut>& vout);
      void GetDenominationsToString(int nDenom, std::string& strDenom);
      // get the denominations for a specific amount of ion.
      int GetDenominationsByAmount(int64_t nAmount, int nDenomTarget=0);
  
      int GetDenominationsByAmounts(std::vector<int64_t>& vecAmount);
  };
  
  
  void ConnectToDarkSendMasterNodeWinner();
  
  void ThreadCheckDarkSendPool();
  
  #endif
  