text: // Copyright (c) 2011-2014 The Bitcoin developers
  // Copyright (c) 2014-2015 The Dash developers
  // Copyright (c) 2015-2017 The PIVX developers
  // Copyright (c) 2017-2018 The ESTERRA Coin developers
  // Distributed under the MIT/X11 software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include "addresstablemodel.h"
  
  #include "guiutil.h"
  #include "walletmodel.h"
  
  #include "base58.h"
  #include "wallet.h"
  #include "askpassphrasedialog.h"
  
  #include <QDebug>
  #include <QFont>
  
  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);
              BOOST_FOREACH (const PAIRTYPE(CTxDestination, CAddressBookData) & item, wallet->mapAddressBook) {
                  const CBitcoinAddress& address = item.first;
                  bool fMine = IsMine(*wallet, address.Get());
                  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(address.ToString())));
              }
          }
          // 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::bitcoinAddressFont();
          }
          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 = CBitcoinAddress(rec->address.toStdString()).Get();
          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 = CBitcoinAddress(value.toString().toStdString()).Get();
              // 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 ESTERRA Coin 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(CBitcoinAddress(strAddress).Get())) {
                  editStatus = DUPLICATE_ADDRESS;
                  return QString();
              }
          }
      } else if (type == Receive) {
          // Generate a new address to associate with given label
          CPubKey newKey;
          if (!wallet->GetKeyFromPool(newKey)) {
              WalletModel::UnlockContext ctx(walletModel->requestUnlock(AskPassphraseDialog::Context::Unlock_Full, true));
              if (!ctx.isValid()) {
                  // Unlock wallet failed or was cancelled
                  editStatus = WALLET_UNLOCK_FAILURE;
                  return QString();
              }
              if (!wallet->GetKeyFromPool(newKey)) {
                  editStatus = KEY_GENERATION_FAILURE;
                  return QString();
              }
          }
          strAddress = CBitcoinAddress(newKey.GetID()).ToString();
      } else {
          return QString();
      }
  
      // Add entry
      {
          LOCK(wallet->cs_wallet);
          wallet->SetAddressBook(CBitcoinAddress(strAddress).Get(), 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(CBitcoinAddress(rec->address.toStdString()).Get());
      }
      return true;
  }
  
  /* Look up label for address in address book, if not found return empty string.
   */
  QString AddressTableModel::labelForAddress(const QString& address) const
  {
      {
          LOCK(wallet->cs_wallet);
          CBitcoinAddress address_parsed(address.toStdString());
          std::map<CTxDestination, CAddressBookData>::iterator mi = wallet->mapAddressBook.find(address_parsed.Get());
          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)
  {
      emit dataChanged(index(idx, 0, QModelIndex()), index(idx, columns.length() - 1, QModelIndex()));
  }
  