text: // Copyright (c) 2011-2015 The Bitcoin Core developers
  // Copyright (c) 2014-2020 The Dash Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include <qt/addresstablemodel.h>
  
  #include <qt/guiutil.h>
  #include <qt/walletmodel.h>
  
  #include <base58.h>
  #include <wallet/wallet.h>
  
  
  #include <QFont>
  #include <QDebug>
  
  const QString AddressTableModel::Send = "S";
  const QString AddressTableModel::Receive = "R";
  
  struct AddressTableEntry
  {
      enum Type {
          Sending,
          Receiving,
          Hidden /* QSortFilterProxyModel will filter these out */
      };
  
      Type type;
      QString label;
      QString address;
  
      AddressTableEntry() {}
      AddressTableEntry(Type _type, const QString &_label, const QString &_address):
          type(_type), label(_label), address(_address) {}
  };
  
  struct AddressTableEntryLessThan
  {
      bool operator()(const AddressTableEntry &a, const AddressTableEntry &b) const
      {
          return a.address < b.address;
      }
      bool operator()(const AddressTableEntry &a, const QString &b) const
      {
          return a.address < b;
      }
      bool operator()(const QString &a, const AddressTableEntry &b) const
      {
          return a < b.address;
      }
  };
  
  /* Determine address type from address purpose */
  static AddressTableEntry::Type translateTransactionType(const QString &strPurpose, bool isMine)
  {
      AddressTableEntry::Type addressType = AddressTableEntry::Hidden;
      // "refund" addresses aren't shown, and change addresses aren't in mapAddressBook at all.
      if (strPurpose == "send")
          addressType = AddressTableEntry::Sending;
      else if (strPurpose == "receive")
          addressType = AddressTableEntry::Receiving;
      else if (strPurpose == "unknown" || strPurpose == "") // if purpose not set, guess
          addressType = (isMine ? AddressTableEntry::Receiving : AddressTableEntry::Sending);
      return addressType;
  }
  
  // Private implementation
  class AddressTablePriv
  {
  public:
      CWallet *wallet;
      QList<AddressTableEntry> cachedAddressTable;
      AddressTableModel *parent;
  
      AddressTablePriv(CWallet *_wallet, AddressTableModel *_parent):
          wallet(_wallet), parent(_parent) {}
  
      void refreshAddressTable()
      {
          cachedAddressTable.clear();
          {
              LOCK(wallet->cs_wallet);
              for (const std::pair<CTxDestination, CAddressBookData>& item : wallet->mapAddressBook)
              {
                  const CTxDestination& address = item.first;
                  bool fMine = IsMine(*wallet, address);
                  AddressTableEntry::Type addressType = translateTransactionType(
                          QString::fromStdString(item.second.purpose), fMine);
                  const std::string& strName = item.second.name;
                  cachedAddressTable.append(AddressTableEntry(addressType,
                                    QString::fromStdString(strName),
                                    QString::fromStdString(EncodeDestination(address))));
              }
          }
          // qLowerBound() and qUpperBound() require our cachedAddressTable list to be sorted in asc order
          // Even though the map is already sorted this re-sorting step is needed because the originating map
          // is sorted by binary address, not by base58() address.
          qSort(cachedAddressTable.begin(), cachedAddressTable.end(), AddressTableEntryLessThan());
      }
  
      void updateEntry(const QString &address, const QString &label, bool isMine, const QString &purpose, int status)
      {
          // Find address / label in model
          QList<AddressTableEntry>::iterator lower = qLowerBound(
              cachedAddressTable.begin(), cachedAddressTable.end(), address, AddressTableEntryLessThan());
          QList<AddressTableEntry>::iterator upper = qUpperBound(
              cachedAddressTable.begin(), cachedAddressTable.end(), address, AddressTableEntryLessThan());
          int lowerIndex = (lower - cachedAddressTable.begin());
          int upperIndex = (upper - cachedAddressTable.begin());
          bool inModel = (lower != upper);
          AddressTableEntry::Type newEntryType = translateTransactionType(purpose, isMine);
  
          switch(status)
          {
          case CT_NEW:
              if(inModel)
              {
                  qWarning() << "AddressTablePriv::updateEntry: Warning: Got CT_NEW, but entry is already in model";
                  break;
              }
              parent->beginInsertRows(QModelIndex(), lowerIndex, lowerIndex);
              cachedAddressTable.insert(lowerIndex, AddressTableEntry(newEntryType, label, address));
              parent->endInsertRows();
              break;
          case CT_UPDATED:
              if(!inModel)
              {
                  qWarning() << "AddressTablePriv::updateEntry: Warning: Got CT_UPDATED, but entry is not in model";
                  break;
              }
              lower->type = newEntryType;
              lower->label = label;
              parent->emitDataChanged(lowerIndex);
              break;
          case CT_DELETED:
              if(!inModel)
              {
                  qWarning() << "AddressTablePriv::updateEntry: Warning: Got CT_DELETED, but entry is not in model";
                  break;
              }
              parent->beginRemoveRows(QModelIndex(), lowerIndex, upperIndex-1);
              cachedAddressTable.erase(lower, upper);
              parent->endRemoveRows();
              break;
          }
      }
  
      int size()
      {
          return cachedAddressTable.size();
      }
  
      AddressTableEntry *index(int idx)
      {
          if(idx >= 0 && idx < cachedAddressTable.size())
          {
              return &cachedAddressTable[idx];
          }
          else
          {
              return 0;
          }
      }
  };
  
  AddressTableModel::AddressTableModel(CWallet *_wallet, WalletModel *parent) :
      QAbstractTableModel(parent),walletModel(parent),wallet(_wallet),priv(0)
  {
      columns << tr("Label") << tr("Address");
      priv = new AddressTablePriv(wallet, this);
      priv->refreshAddressTable();
  }
  
  AddressTableModel::~AddressTableModel()
  {
      delete priv;
  }
  
  int AddressTableModel::rowCount(const QModelIndex &parent) const
  {
      Q_UNUSED(parent);
      return priv->size();
  }
  
  int AddressTableModel::columnCount(const QModelIndex &parent) const
  {
      Q_UNUSED(parent);
      return columns.length();
  }
  
  QVariant AddressTableModel::data(const QModelIndex &index, int role) const
  {
      if(!index.isValid())
          return QVariant();
  
      AddressTableEntry *rec = static_cast<AddressTableEntry*>(index.internalPointer());
  
      if(role == Qt::DisplayRole || role == Qt::EditRole)
      {
          switch(index.column())
          {
          case Label:
              if(rec->label.isEmpty() && role == Qt::DisplayRole)
              {
                  return tr("(no label)");
              }
              else
              {
                  return rec->label;
              }
          case Address:
              return rec->address;
          }
      }
      else if (role == Qt::FontRole)
      {
          QFont font;
          if(index.column() == Address)
          {
              font = GUIUtil::getFontNormal();
          }
          return font;
      }
      else if (role == TypeRole)
      {
          switch(rec->type)
          {
          case AddressTableEntry::Sending:
              return Send;
          case AddressTableEntry::Receiving:
              return Receive;
          default: break;
          }
      }
      return QVariant();
  }
  
  bool AddressTableModel::setData(const QModelIndex &index, const QVariant &value, int role)
  {
      if(!index.isValid())
          return false;
      AddressTableEntry *rec = static_cast<AddressTableEntry*>(index.internalPointer());
      std::string strPurpose = (rec->type == AddressTableEntry::Sending ? "send" : "receive");
      editStatus = OK;
  
      if(role == Qt::EditRole)
      {
          LOCK(wallet->cs_wallet); /* For SetAddressBook / DelAddressBook */
          CTxDestination curAddress = DecodeDestination(rec->address.toStdString());
          if(index.column() == Label)
          {
              // Do nothing, if old label == new label
              if(rec->label == value.toString())
              {
                  editStatus = NO_CHANGES;
                  return false;
              }
              wallet->SetAddressBook(curAddress, value.toString().toStdString(), strPurpose);
          } else if(index.column() == Address) {
              CTxDestination newAddress = DecodeDestination(value.toString().toStdString());
              // Refuse to set invalid address, set error status and return false
              if(boost::get<CNoDestination>(&newAddress))
              {
                  editStatus = INVALID_ADDRESS;
                  return false;
              }
              // Do nothing, if old address == new address
              else if(newAddress == curAddress)
              {
                  editStatus = NO_CHANGES;
                  return false;
              }
              // Check for duplicate addresses to prevent accidental deletion of addresses, if you try
              // to paste an existing address over another address (with a different label)
              else if(wallet->mapAddressBook.count(newAddress))
              {
                  editStatus = DUPLICATE_ADDRESS;
                  return false;
              }
              // Double-check that we're not overwriting a receiving address
              else if(rec->type == AddressTableEntry::Sending)
              {
                  // Remove old entry
                  wallet->DelAddressBook(curAddress);
                  // Add new entry with new address
                  wallet->SetAddressBook(newAddress, rec->label.toStdString(), strPurpose);
              }
          }
          return true;
      }
      return false;
  }
  
  QVariant AddressTableModel::headerData(int section, Qt::Orientation orientation, int role) const
  {
      if(orientation == Qt::Horizontal)
      {
          if(role == Qt::DisplayRole && section < columns.size())
          {
              return columns[section];
          }
      }
      return QVariant();
  }
  
  Qt::ItemFlags AddressTableModel::flags(const QModelIndex &index) const
  {
      if(!index.isValid())
          return 0;
      AddressTableEntry *rec = static_cast<AddressTableEntry*>(index.internalPointer());
  
      Qt::ItemFlags retval = Qt::ItemIsSelectable | Qt::ItemIsEnabled;
      // Can edit address and label for sending addresses,
      // and only label for receiving addresses.
      if(rec->type == AddressTableEntry::Sending ||
        (rec->type == AddressTableEntry::Receiving && index.column()==Label))
      {
          retval |= Qt::ItemIsEditable;
      }
      return retval;
  }
  
  QModelIndex AddressTableModel::index(int row, int column, const QModelIndex &parent) const
  {
      Q_UNUSED(parent);
      AddressTableEntry *data = priv->index(row);
      if(data)
      {
          return createIndex(row, column, priv->index(row));
      }
      else
      {
          return QModelIndex();
      }
  }
  
  void AddressTableModel::updateEntry(const QString &address,
          const QString &label, bool isMine, const QString &purpose, int status)
  {
      // Update address book model from Jokecoin core
      priv->updateEntry(address, label, isMine, purpose, status);
  }
  
  QString AddressTableModel::addRow(const QString &type, const QString &label, const QString &address)
  {
      std::string strLabel = label.toStdString();
      std::string strAddress = address.toStdString();
  
      editStatus = OK;
  
      if(type == Send)
      {
          if(!walletModel->validateAddress(address))
          {
              editStatus = INVALID_ADDRESS;
              return QString();
          }
          // Check for duplicate addresses
          {
              LOCK(wallet->cs_wallet);
              if(wallet->mapAddressBook.count(DecodeDestination(strAddress)))
              {
                  editStatus = DUPLICATE_ADDRESS;
                  return QString();
              }
          }
      }
      else if(type == Receive)
      {
          // Generate a new address to associate with given label
          CPubKey newKey;
          if(!wallet->GetKeyFromPool(newKey, false))
          {
              WalletModel::UnlockContext ctx(walletModel->requestUnlock());
              if(!ctx.isValid())
              {
                  // Unlock wallet failed or was cancelled
                  editStatus = WALLET_UNLOCK_FAILURE;
                  return QString();
              }
              if(!wallet->GetKeyFromPool(newKey, false))
              {
                  editStatus = KEY_GENERATION_FAILURE;
                  return QString();
              }
          }
          strAddress = EncodeDestination(newKey.GetID());
      }
      else
      {
          return QString();
      }
  
      // Add entry
      {
          LOCK(wallet->cs_wallet);
          wallet->SetAddressBook(DecodeDestination(strAddress), strLabel,
                                 (type == Send ? "send" : "receive"));
      }
      return QString::fromStdString(strAddress);
  }
  
  bool AddressTableModel::removeRows(int row, int count, const QModelIndex &parent)
  {
      Q_UNUSED(parent);
      AddressTableEntry *rec = priv->index(row);
      if(count != 1 || !rec || rec->type == AddressTableEntry::Receiving)
      {
          // Can only remove one row at a time, and cannot remove rows not in model.
          // Also refuse to remove receiving addresses.
          return false;
      }
      {
          LOCK(wallet->cs_wallet);
          wallet->DelAddressBook(DecodeDestination(rec->address.toStdString()));
      }
      return true;
  }
  
  /* Look up label for address in address book, if not found return empty string.
   */
  QString AddressTableModel::labelForAddress(const QString &address) const
  {
      CTxDestination dest = DecodeDestination(address.toStdString());
      return labelForDestination(dest);
  }
  
  
  QString AddressTableModel::labelForDestination(const CTxDestination &dest) const
  {
      {
          LOCK(wallet->cs_wallet);
          std::map<CTxDestination, CAddressBookData>::iterator mi = wallet->mapAddressBook.find(dest);
          if (mi != wallet->mapAddressBook.end())
          {
              return QString::fromStdString(mi->second.name);
          }
      }
      return QString();
  }
  
  int AddressTableModel::lookupAddress(const QString &address) const
  {
      QModelIndexList lst = match(index(0, Address, QModelIndex()),
                                  Qt::EditRole, address, 1, Qt::MatchExactly);
      if(lst.isEmpty())
      {
          return -1;
      }
      else
      {
          return lst.at(0).row();
      }
  }
  
  void AddressTableModel::emitDataChanged(int idx)
  {
      Q_EMIT dataChanged(index(idx, 0, QModelIndex()), index(idx, columns.length()-1, QModelIndex()));
  }
  