text: // Copyright (c) 2011-2015 The Bitcoin Core developers
  // Copyright (c) 2014-2017 The Enter Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include "bitcoinunits.h"
  #include "chainparams.h"
  #include "primitives/transaction.h"
  
  #include <QSettings>
  #include <QStringList>
  
  BitcoinUnits::BitcoinUnits(QObject *parent):
          QAbstractListModel(parent),
          unitlist(availableUnits())
  {
  }
  
  QList<BitcoinUnits::Unit> BitcoinUnits::availableUnits()
  {
      QList<BitcoinUnits::Unit> unitlist;
      unitlist.append(ENTER);
      unitlist.append(mENTER);
      unitlist.append(uENTER);
      unitlist.append(duffs);
      return unitlist;
  }
  
  bool BitcoinUnits::valid(int unit)
  {
      switch(unit)
      {
      case ENTER:
      case mENTER:
      case uENTER:
      case duffs:
          return true;
      default:
          return false;
      }
  }
  
  QString BitcoinUnits::name(int unit)
  {
      if(Params().NetworkIDString() == CBaseChainParams::MAIN)
      {
          switch(unit)
          {
              case ENTER: return QString("ENTER");
              case mENTER: return QString("mENTER");
              case uENTER: return QString::fromUtf8("μENTER");
              case duffs: return QString("duffs");
              default: return QString("???");
          }
      }
      else
      {
          switch(unit)
          {
              case ENTER: return QString("tENTER");
              case mENTER: return QString("mtENTER");
              case uENTER: return QString::fromUtf8("μtENTER");
              case duffs: return QString("tduffs");
              default: return QString("???");
          }
      }
  }
  
  QString BitcoinUnits::description(int unit)
  {
      if(Params().NetworkIDString() == CBaseChainParams::MAIN)
      {
          switch(unit)
          {
              case ENTER: return QString("Enter");
              case mENTER: return QString("Milli-Enter (1 / 1" THIN_SP_UTF8 "000)");
              case uENTER: return QString("Micro-Enter (1 / 1" THIN_SP_UTF8 "000" THIN_SP_UTF8 "000)");
              case duffs: return QString("Ten Nano-Enter (1 / 100" THIN_SP_UTF8 "000" THIN_SP_UTF8 "000)");
              default: return QString("???");
          }
      }
      else
      {
          switch(unit)
          {
              case ENTER: return QString("TestEnters");
              case mENTER: return QString("Milli-TestEnter (1 / 1" THIN_SP_UTF8 "000)");
              case uENTER: return QString("Micro-TestEnter (1 / 1" THIN_SP_UTF8 "000" THIN_SP_UTF8 "000)");
              case duffs: return QString("Ten Nano-TestEnter (1 / 100" THIN_SP_UTF8 "000" THIN_SP_UTF8 "000)");
              default: return QString("???");
          }
      }
  }
  
  qint64 BitcoinUnits::factor(int unit)
  {
      switch(unit)
      {
      case ENTER:  return 100000000;
      case mENTER: return 100000;
      case uENTER: return 100;
      case duffs: return 1;
      default:   return 100000000;
      }
  }
  
  int BitcoinUnits::decimals(int unit)
  {
      switch(unit)
      {
      case ENTER: return 8;
      case mENTER: return 5;
      case uENTER: return 2;
      case duffs: return 0;
      default: return 0;
      }
  }
  
  QString BitcoinUnits::format(int unit, const CAmount& nIn, bool fPlus, SeparatorStyle separators)
  {
      // Note: not using straight sprintf here because we do NOT want
      // localized number formatting.
      if(!valid(unit))
          return QString(); // Refuse to format invalid unit
      qint64 n = (qint64)nIn;
      qint64 coin = factor(unit);
      int num_decimals = decimals(unit);
      qint64 n_abs = (n > 0 ? n : -n);
      qint64 quotient = n_abs / coin;
      qint64 remainder = n_abs % coin;
      QString quotient_str = QString::number(quotient);
      QString remainder_str = QString::number(remainder).rightJustified(num_decimals, '0');
  
      // Use SI-style thin space separators as these are locale independent and can't be
      // confused with the decimal marker.
      QChar thin_sp(THIN_SP_CP);
      int q_size = quotient_str.size();
      if (separators == separatorAlways || (separators == separatorStandard && q_size > 4))
          for (int i = 3; i < q_size; i += 3)
              quotient_str.insert(q_size - i, thin_sp);
  
      if (n < 0)
          quotient_str.insert(0, '-');
      else if (fPlus && n > 0)
          quotient_str.insert(0, '+');
  
      if (num_decimals <= 0)
          return quotient_str;
  
      return quotient_str + QString(".") + remainder_str;
  }
  
  
  // NOTE: Using formatWithUnit in an HTML context risks wrapping
  // quantities at the thousands separator. More subtly, it also results
  // in a standard space rather than a thin space, due to a bug in Qt's
  // XML whitespace canonicalisation
  //
  // Please take care to use formatHtmlWithUnit instead, when
  // appropriate.
  
  QString BitcoinUnits::formatWithUnit(int unit, const CAmount& amount, bool plussign, SeparatorStyle separators)
  {
      return format(unit, amount, plussign, separators) + QString(" ") + name(unit);
  }
  
  QString BitcoinUnits::formatHtmlWithUnit(int unit, const CAmount& amount, bool plussign, SeparatorStyle separators)
  {
      QString str(formatWithUnit(unit, amount, plussign, separators));
      str.replace(QChar(THIN_SP_CP), QString(THIN_SP_HTML));
      return QString("<span style='white-space: nowrap;'>%1</span>").arg(str);
  }
  
  QString BitcoinUnits::floorWithUnit(int unit, const CAmount& amount, bool plussign, SeparatorStyle separators)
  {
      QSettings settings;
      int digits = settings.value("digits").toInt();
  
      QString result = format(unit, amount, plussign, separators);
      if(decimals(unit) > digits) result.chop(decimals(unit) - digits);
  
      return result + QString(" ") + name(unit);
  }
  
  QString BitcoinUnits::floorHtmlWithUnit(int unit, const CAmount& amount, bool plussign, SeparatorStyle separators)
  {
      QString str(floorWithUnit(unit, amount, plussign, separators));
      str.replace(QChar(THIN_SP_CP), QString(THIN_SP_HTML));
      return QString("<span style='white-space: nowrap;'>%1</span>").arg(str);
  }
  
  bool BitcoinUnits::parse(int unit, const QString &value, CAmount *val_out)
  {
      if(!valid(unit) || value.isEmpty())
          return false; // Refuse to parse invalid unit or empty string
      int num_decimals = decimals(unit);
  
      // Ignore spaces and thin spaces when parsing
      QStringList parts = removeSpaces(value).split(".");
  
      if(parts.size() > 2)
      {
          return false; // More than one dot
      }
      QString whole = parts[0];
      QString decimals;
  
      if(parts.size() > 1)
      {
          decimals = parts[1];
      }
      if(decimals.size() > num_decimals)
      {
          return false; // Exceeds max precision
      }
      bool ok = false;
      QString str = whole + decimals.leftJustified(num_decimals, '0');
  
      if(str.size() > 18)
      {
          return false; // Longer numbers will exceed 63 bits
      }
      CAmount retvalue(str.toLongLong(&ok));
      if(val_out)
      {
          *val_out = retvalue;
      }
      return ok;
  }
  
  QString BitcoinUnits::getAmountColumnTitle(int unit)
  {
      QString amountTitle = QObject::tr("Amount");
      if (BitcoinUnits::valid(unit))
      {
          amountTitle += " ("+BitcoinUnits::name(unit) + ")";
      }
      return amountTitle;
  }
  
  int BitcoinUnits::rowCount(const QModelIndex &parent) const
  {
      Q_UNUSED(parent);
      return unitlist.size();
  }
  
  QVariant BitcoinUnits::data(const QModelIndex &index, int role) const
  {
      int row = index.row();
      if(row >= 0 && row < unitlist.size())
      {
          Unit unit = unitlist.at(row);
          switch(role)
          {
          case Qt::EditRole:
          case Qt::DisplayRole:
              return QVariant(name(unit));
          case Qt::ToolTipRole:
              return QVariant(description(unit));
          case UnitRole:
              return QVariant(static_cast<int>(unit));
          }
      }
      return QVariant();
  }
  
  CAmount BitcoinUnits::maxMoney()
  {
      return MAX_MONEY;
  }
  