qt: Display txfee in first sendCoinsDialog message box

Signed-off-by: Jonas Schnelli <jonas.schnelli@include7.ch>

7 files changed, 207 insertions, 47 deletions

diff --git a/bitcoin-qt.pro b/bitcoin-qt.pro
index 9baa03a4e3..00dd02da58 100644
--- a/bitcoin-qt.pro
+++ b/bitcoin-qt.pro
@@ -240,7 +240,8 @@ HEADERS += src/qt/bitcoingui.h \
     src/threadsafety.h \
     src/limitedmap.h \
     src/qt/splashscreen.h \
-    src/qt/intro.h
+    src/qt/intro.h \
+    src/qt/walletmodeltransaction.h
 
 SOURCES += src/qt/bitcoin.cpp \
     src/qt/bitcoingui.cpp \
@@ -313,7 +314,8 @@ SOURCES += src/qt/bitcoin.cpp \
     src/leveldb.cpp \
     src/txdb.cpp \
     src/qt/splashscreen.cpp \
-    src/qt/intro.cpp
+    src/qt/intro.cpp \
+    src/qt/walletmodeltransaction.cpp
 
 RESOURCES += src/qt/bitcoin.qrc
 
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index df3ff5c9a9..809eff9c27 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -97,9 +97,18 @@ void SendCoinsDialog::on_sendButton_clicked()
         QString amount = BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), rcp.amount);
         if (rcp.authenticatedMerchant.isEmpty())
         {
-            QString address = rcp.address;
-            QString to = GUIUtil::HtmlEscape(rcp.label);
-            formatted.append(tr("<b>%1</b> to %2 (%3)").arg(amount, to, address));
+            QString recipientElement = QString("<b>%1</b> ").arg(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), rcp.amount));
+            recipientElement.append(tr("to"));
+
+            if(rcp.label.length() > 0)
+            {
+                recipientElement.append(QString(" %1 <span style='font-size:8px;'>%2</span><br />").arg(GUIUtil::HtmlEscape(rcp.label), rcp.address)); // add address with label
+            }
+            else
+            {
+                recipientElement.append(QString(" %1<br />").arg(rcp.address)); // add address WITHOUT label
+            }
+            formatted.append(recipientElement);
         }
         else
         {
@@ -110,16 +119,6 @@ void SendCoinsDialog::on_sendButton_clicked()
 
     fNewRecipientAllowed = false;
 
-    QMessageBox::StandardButton retval = QMessageBox::question(this, tr("Confirm send coins"),
-                          tr("Are you sure you want to send %1?").arg(formatted.join(tr(" and "))),
-          QMessageBox::Yes|QMessageBox::Cancel,
-          QMessageBox::Cancel);
-
-    if(retval != QMessageBox::Yes)
-    {
-        fNewRecipientAllowed = true;
-        return;
-    }
 
     WalletModel::UnlockContext ctx(model->requestUnlock());
     if(!ctx.isValid())
@@ -129,8 +128,11 @@ void SendCoinsDialog::on_sendButton_clicked()
         return;
     }
 
-    WalletModel::SendCoinsReturn sendstatus = model->sendCoins(recipients);
-    switch(sendstatus.status)
+    // prepare transaction for getting txFee earlier
+    WalletModelTransaction currentTransaction(recipients);
+    WalletModel::SendCoinsReturn prepareStatus = model->prepareTransaction(currentTransaction);
+
+    switch(prepareStatus.status)
     {
     case WalletModel::InvalidAddress:
         QMessageBox::warning(this, tr("Send Coins"),
@@ -150,7 +152,7 @@ void SendCoinsDialog::on_sendButton_clicked()
     case WalletModel::AmountWithFeeExceedsBalance:
         QMessageBox::warning(this, tr("Send Coins"),
             tr("The total exceeds your balance when the %1 transaction fee is included.").
-            arg(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), sendstatus.fee)),
+            arg(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), currentTransaction.getTransactionFee())),
             QMessageBox::Ok, QMessageBox::Ok);
         break;
     case WalletModel::DuplicateAddress:
@@ -163,6 +165,51 @@ void SendCoinsDialog::on_sendButton_clicked()
             tr("Error: Transaction creation failed!"),
             QMessageBox::Ok, QMessageBox::Ok);
         break;
+    case WalletModel::Aborted: // User aborted, nothing to do
+    case WalletModel::OK:
+    case WalletModel::TransactionCommitFailed:
+        break;
+    }
+
+    if(prepareStatus.status != WalletModel::OK) {
+        fNewRecipientAllowed = true;
+        return;
+    }
+
+    qint64 txFee = currentTransaction.getTransactionFee();
+    QString questionString = tr("Are you sure you want to send?");
+    questionString.append("<br /><br />%1");
+
+    if(txFee > 0)
+    {
+        // append fee string if a fee is required
+        questionString.append("<hr /><span style='color:#aa0000;'>");
+        questionString.append(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), txFee));
+        questionString.append("</span> ");
+        questionString.append(tr("added as transaction fee"));
+    }
+    if(txFee > 0 || recipients.count() > 1)
+    {
+        // add total amount string if there are more then one recipients or a fee is required
+        questionString.append("<hr />");
+        questionString.append(tr("Total Amount %1").arg(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), currentTransaction.getTotalTransactionAmount()+txFee)));
+    }
+
+    QMessageBox::StandardButton retval = QMessageBox::question(this, tr("Confirm send coins"),
+        questionString.arg(formatted.join("<br />")),
+        QMessageBox::Yes|QMessageBox::Cancel,
+        QMessageBox::Cancel);
+
+    if(retval != QMessageBox::Yes)
+    {
+        fNewRecipientAllowed = true;
+        return;
+    }
+
+    // now send the prepared transaction
+    WalletModel::SendCoinsReturn sendstatus = model->sendCoins(currentTransaction);
+    switch(sendstatus.status)
+    {
     case WalletModel::TransactionCommitFailed:
         QMessageBox::warning(this, tr("Send Coins"),
             tr("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."),
@@ -173,6 +220,8 @@ void SendCoinsDialog::on_sendButton_clicked()
     case WalletModel::OK:
         accept();
         break;
+    default:
+        break;
     }
     fNewRecipientAllowed = true;
 }
diff --git a/src/qt/sendcoinsdialog.h b/src/qt/sendcoinsdialog.h
index e75a003ba1..f4bffedc9b 100644
--- a/src/qt/sendcoinsdialog.h
+++ b/src/qt/sendcoinsdialog.h
@@ -10,6 +10,7 @@ namespace Ui {
 class WalletModel;
 class SendCoinsEntry;
 class SendCoinsRecipient;
+class OptionsModel;
 
 QT_BEGIN_NAMESPACE
 class QUrl;
diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
index 61357647b7..cdc7ae3874 100644
--- a/src/qt/walletmodel.cpp
+++ b/src/qt/walletmodel.cpp
@@ -5,7 +5,6 @@
 #include "transactiontablemodel.h"
 
 #include "ui_interface.h"
-#include "wallet.h"
 #include "walletdb.h" // for BackupWallet
 #include "base58.h"
 
@@ -124,11 +123,11 @@ bool WalletModel::validateAddress(const QString &address)
     return addressParsed.IsValid();
 }
 
-WalletModel::SendCoinsReturn WalletModel::sendCoins(const QList<SendCoinsRecipient> &recipients)
+WalletModel::SendCoinsReturn WalletModel::prepareTransaction(WalletModelTransaction &transaction)
 {
     qint64 total = 0;
+    QList<SendCoinsRecipient> recipients = transaction.getRecipients();
     std::vector<std::pair<CScript, int64> > vecSend;
-    QByteArray transaction;
 
     if(recipients.empty())
     {
@@ -192,58 +191,70 @@ WalletModel::SendCoinsReturn WalletModel::sendCoins(const QList<SendCoinsRecipie
 
     if((total + nTransactionFee) > getBalance())
     {
-        return SendCoinsReturn(AmountWithFeeExceedsBalance, nTransactionFee);
+        transaction.setTransactionFee(nTransactionFee);
+        return SendCoinsReturn(AmountWithFeeExceedsBalance);
     }
 
     {
         LOCK2(cs_main, wallet->cs_wallet);
 
-        CReserveKey keyChange(wallet);
+        transaction.newPossibleKeyChange(wallet);
         int64 nFeeRequired = 0;
         std::string strFailReason;
-        CWalletTx wtx;
-        bool fCreated = wallet->CreateTransaction(vecSend, wtx, keyChange, nFeeRequired, strFailReason);
+
+        CWalletTx *newTx = transaction.getTransaction();
+        CReserveKey *keyChange = transaction.getPossibleKeyChange();
+        bool fCreated = wallet->CreateTransaction(vecSend, *newTx, *keyChange, nFeeRequired, strFailReason);
+        transaction.setTransactionFee(nFeeRequired);
 
         if(!fCreated)
         {
             if((total + nFeeRequired) > wallet->GetBalance())
             {
-                return SendCoinsReturn(AmountWithFeeExceedsBalance, nFeeRequired);
+                return SendCoinsReturn(AmountWithFeeExceedsBalance);
             }
             emit message(tr("Send Coins"), QString::fromStdString(strFailReason),
                          CClientUIInterface::MSG_ERROR);
             return TransactionCreationFailed;
         }
+    }
+
+    return SendCoinsReturn(OK);
+}
+
+WalletModel::SendCoinsReturn WalletModel::sendCoins(WalletModelTransaction &transaction)
+{
+    QByteArray transaction_array; /* store serialized transaction */
+
+    {
+        LOCK2(cs_main, wallet->cs_wallet);
+        CWalletTx *newTx = transaction.getTransaction();
+
         // Store PaymentRequests in wtx.vOrderForm in wallet.
-        foreach(const SendCoinsRecipient &rcp, recipients)
+        foreach(const SendCoinsRecipient &rcp, transaction.getRecipients())
         {
             if (rcp.paymentRequest.IsInitialized())
             {
                 std::string key("PaymentRequest");
                 std::string value;
                 rcp.paymentRequest.SerializeToString(&value);
-                wtx.vOrderForm.push_back(make_pair(key, value));
+                newTx->vOrderForm.push_back(make_pair(key, value));
             }
-        }        
-
-        if(!uiInterface.ThreadSafeAskFee(nFeeRequired))
-        {
-            return Aborted;
         }
-        if(!wallet->CommitTransaction(wtx, keyChange))
-        {
+
+        CReserveKey *keyChange = transaction.getPossibleKeyChange();
+        if(!wallet->CommitTransaction(*newTx, *keyChange))
             return TransactionCommitFailed;
-        }
 
-        CTransaction* t = (CTransaction*)&wtx;
+        CTransaction* t = (CTransaction*)newTx;
         CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
         ssTx << *t;
-        transaction.append(&(ssTx[0]), ssTx.size());
+        transaction_array.append(&(ssTx[0]), ssTx.size());
     }
 
     // Add addresses / update labels that we've sent to to the address book,
-    // and emit coinsSent signal
-    foreach(const SendCoinsRecipient &rcp, recipients)
+    // and emit coinsSent signal for each recipient
+    foreach(const SendCoinsRecipient &rcp, transaction.getRecipients())
     {
         std::string strAddress = rcp.address.toStdString();
         CTxDestination dest = CBitcoinAddress(strAddress).Get();
@@ -263,10 +274,10 @@ WalletModel::SendCoinsReturn WalletModel::sendCoins(const QList<SendCoinsRecipie
                 wallet->SetAddressBook(dest, strLabel, ""); // "" means don't change purpose
             }
         }
-        emit coinsSent(wallet, rcp, transaction);
+        emit coinsSent(wallet, rcp, transaction_array);
     }
 
-    return SendCoinsReturn(OK, 0);
+    return SendCoinsReturn(OK);
 }
 
 OptionsModel *WalletModel::getOptionsModel()
diff --git a/src/qt/walletmodel.h b/src/qt/walletmodel.h
index 8cba10f5d2..f8eee45249 100644
--- a/src/qt/walletmodel.h
+++ b/src/qt/walletmodel.h
@@ -4,12 +4,15 @@
 #include <QObject>
 
 #include "allocators.h" /* for SecureString */
+#include "wallet.h"
+#include "walletmodeltransaction.h"
 #include "paymentrequestplus.h"
 
 class OptionsModel;
 class AddressTableModel;
 class TransactionTableModel;
 class CWallet;
+class WalletModelTransaction;
 
 QT_BEGIN_NAMESPACE
 class QTimer;
@@ -74,15 +77,16 @@ public:
     // Return status record for SendCoins, contains error id + information
     struct SendCoinsReturn
     {
-        SendCoinsReturn(StatusCode status,
-                        qint64 fee=0):
-            status(status), fee(fee) {}
+        SendCoinsReturn(StatusCode status):
+            status(status) {}
         StatusCode status;
-        qint64 fee; // is used in case status is "AmountWithFeeExceedsBalance"
     };
 
+    // prepare transaction for getting txfee before sending coins
+    SendCoinsReturn prepareTransaction(WalletModelTransaction &transaction);
+
     // Send coins to a list of recipients
-    SendCoinsReturn sendCoins(const QList<SendCoinsRecipient> &recipients);
+    SendCoinsReturn sendCoins(WalletModelTransaction &transaction);
 
     // Wallet encryption
     bool setWalletEncrypted(bool encrypted, const SecureString &passphrase);
diff --git a/src/qt/walletmodeltransaction.cpp b/src/qt/walletmodeltransaction.cpp
new file mode 100644
index 0000000000..96fc3edbb2
--- /dev/null
+++ b/src/qt/walletmodeltransaction.cpp
@@ -0,0 +1,56 @@
+#include "walletmodeltransaction.h"
+
+WalletModelTransaction::WalletModelTransaction(const QList<SendCoinsRecipient> &recipients) :
+    recipients(recipients),
+    walletTransaction(0),
+    keyChange(0),
+    fee(0)
+{
+    walletTransaction = new CWalletTx();
+}
+
+WalletModelTransaction::~WalletModelTransaction()
+{
+    delete keyChange;
+    delete walletTransaction;
+}
+
+QList<SendCoinsRecipient> WalletModelTransaction::getRecipients()
+{
+    return recipients;
+}
+
+CWalletTx *WalletModelTransaction::getTransaction()
+{
+    return walletTransaction;
+}
+
+qint64 WalletModelTransaction::getTransactionFee()
+{
+    return fee;
+}
+
+void WalletModelTransaction::setTransactionFee(qint64 newFee)
+{
+    fee=newFee;
+}
+
+qint64 WalletModelTransaction::getTotalTransactionAmount()
+{
+    qint64 totalTransactionAmount = 0;
+    foreach(const SendCoinsRecipient &rcp, recipients)
+    {
+        totalTransactionAmount+=rcp.amount;
+    }
+    return totalTransactionAmount;
+}
+
+void WalletModelTransaction::newPossibleKeyChange(CWallet *wallet)
+{
+    keyChange = new CReserveKey(wallet);
+}
+
+CReserveKey *WalletModelTransaction::getPossibleKeyChange()
+{
+    return keyChange;
+}
diff --git a/src/qt/walletmodeltransaction.h b/src/qt/walletmodeltransaction.h
new file mode 100644
index 0000000000..c4848fb12d
--- /dev/null
+++ b/src/qt/walletmodeltransaction.h
@@ -0,0 +1,37 @@
+#ifndef WALLETMODELTRANSACTION_H
+#define WALLETMODELTRANSACTION_H
+
+#include "walletmodel.h"
+
+class SendCoinsRecipient;
+
+/** Data model for a walletmodel transaction. */
+class WalletModelTransaction
+{
+public:
+    explicit WalletModelTransaction(const QList<SendCoinsRecipient> &recipients);
+    ~WalletModelTransaction();
+
+    QList<SendCoinsRecipient> getRecipients();
+
+    CWalletTx *getTransaction();
+
+    void setTransactionFee(qint64 newFee);
+    qint64 getTransactionFee();
+
+    qint64 getTotalTransactionAmount();
+
+    void newPossibleKeyChange(CWallet *wallet);
+    CReserveKey *getPossibleKeyChange();
+
+private:
+    const QList<SendCoinsRecipient> recipients;
+    CWalletTx *walletTransaction;
+    CReserveKey *keyChange;
+    qint64 fee;
+
+public slots:
+
+};
+
+#endif // WALLETMODELTRANSACTION_H