CW-997 coin control enhancements / send ALL fixes (#2114)

* computed sending balance value

* files that didnt get added before

* monero + move unspent calc to view model

* working

* remove old code

* Update lib/view_model/send/send_view_model.dart

---------

Co-authored-by: Omar Hatem <omarh.ismail1@gmail.com>

cw_bitcoin/lib/electrum_balance.dart

@@ -65,6 +65,6 @@ class ElectrumBalance extends Balance {
         'unconfirmed': unconfirmed,
         'frozen': frozen,
         'secondConfirmed': secondConfirmed,
-        'secondUnconfirmed': secondUnconfirmed
+        'secondUnconfirmed': secondUnconfirmed,
       });
 }

cw_bitcoin/lib/electrum_wallet.dart

@@ -4,6 +4,8 @@ import 'dart:io';
 import 'dart:isolate';
 
 import 'package:bitcoin_base/bitcoin_base.dart';
+import 'package:cw_bitcoin/bitcoin_amount_format.dart';
+import 'package:cw_core/format_amount.dart';
 import 'package:cw_core/utils/print_verbose.dart';
 import 'package:cw_bitcoin/bitcoin_wallet.dart';
 import 'package:cw_bitcoin/litecoin_wallet.dart';
@@ -2240,10 +2242,11 @@ abstract class ElectrumWalletBase
 
         if (element.hash == info.hash &&
             element.vout == info.vout &&
-            info.isFrozen &&
             element.bitcoinAddressRecord.address == info.address &&
             element.value == info.value) {
-          totalFrozen += element.value;
+          if (info.isFrozen) {
+            totalFrozen += element.value;
+          }
         }
       });
     });
@@ -2499,6 +2502,12 @@ abstract class ElectrumWalletBase
       transactionHistory.addOne(tx);
     }
   }
+
+  @override
+  String formatCryptoAmount(String amount) {
+    final amountInt = int.parse(amount);
+    return bitcoinAmountToString(amount: amountInt);
+  }
 }
 
 class ScanNode {

cw_core/lib/wallet_base.dart

@@ -36,6 +36,8 @@ abstract class WalletBase<BalanceType extends Balance, HistoryType extends Trans
 
   ObservableMap<CryptoCurrency, BalanceType> get balance;
 
+  String formatCryptoAmount(String amount) => amount;
+
   SyncStatus get syncStatus;
 
   set syncStatus(SyncStatus status);

cw_monero/lib/monero_wallet.dart

@@ -3,6 +3,7 @@ import 'dart:ffi';
 import 'dart:io';
 import 'dart:isolate';
 
+import 'package:cw_core/monero_amount_format.dart';
 import 'package:cw_core/pathForWallet.dart';
 import 'package:cw_core/transaction_priority.dart';
 import 'package:cw_core/account.dart';
@@ -905,4 +906,9 @@ abstract class MoneroWalletBase extends WalletBase<MoneroBalance,
         monero.WalletManager_openWallet(wmPtr, path: '', password: '');
     enableLedgerExchange(dummyWPtr, connection);
   }
+
+  @override
+  String formatCryptoAmount(String amount) {
+    return moneroAmountToString(amount: int.parse(amount));
+  }
 }

cw_wownero/lib/wownero_wallet.dart

@@ -770,4 +770,9 @@ abstract class WowneroWalletBase
 
     return wownero_wallet.verifyMessage(message, address, signature);
   }
+
+  @override
+  String formatCryptoAmount(String amount) {
+    return wowneroAmountToString(amount: int.parse(amount));
+  }
 }

lib/src/screens/send/widgets/send_card.dart

@@ -244,7 +244,7 @@ class SendCardState extends State<SendCard> with AutomaticKeepAliveClientMixin<S
                   currencyValueValidator: output.sendAll
                       ? sendViewModel.allAmountValidator
                       : sendViewModel.amountValidator,
-                  allAmountCallback: () async => output.setSendAll(sendViewModel.balance)),
+                  allAmountCallback: () async => output.setSendAll(sendViewModel.sendingBalance)),
               Divider(
                   height: 1,
                   color: Theme.of(context).extension<SendPageTheme>()!.textFieldHintColor),
@@ -266,7 +266,7 @@ class SendCardState extends State<SendCard> with AutomaticKeepAliveClientMixin<S
                         ),
                       ),
                       Text(
-                        sendViewModel.balance,
+                        sendViewModel.sendingBalance,
                         style: TextStyle(
                             fontSize: 12,
                             fontWeight: FontWeight.w600,
@@ -384,10 +384,16 @@ class SendCardState extends State<SendCard> with AutomaticKeepAliveClientMixin<S
                   padding: EdgeInsets.only(top: 6),
                   child: GestureDetector(
                     key: ValueKey('send_page_unspent_coin_button_key'),
-                    onTap: () => Navigator.of(context).pushNamed(
-                      Routes.unspentCoinsList,
-                      arguments: widget.sendViewModel.coinTypeToSpendFrom,
-                    ),
+                    onTap: () async {
+                      await Navigator.of(context).pushNamed(
+                        Routes.unspentCoinsList,
+                        arguments: widget.sendViewModel.coinTypeToSpendFrom,
+                      );
+                      if (mounted) {
+                        // we just got back from the unspent coins list screen, so we need to recompute the sending balance:
+                        sendViewModel.updateSendingBalance();
+                      }
+                    },
                     child: Container(
                       color: Colors.transparent,
                       child: Row(
@@ -505,7 +511,7 @@ class SendCardState extends State<SendCard> with AutomaticKeepAliveClientMixin<S
 
     reaction((_) => sendViewModel.selectedCryptoCurrency, (Currency currency) {
       if (output.sendAll) {
-        output.setSendAll(sendViewModel.balance);
+        output.setSendAll(sendViewModel.sendingBalance);
       }
 
       output.setCryptoAmount(cryptoAmountController.text);

lib/view_model/send/send_view_model.dart

@@ -225,6 +225,42 @@ abstract class SendViewModelBase extends WalletChangeListenerViewModel with Stor
     return wallet.balance[selectedCryptoCurrency]!.formattedFullAvailableBalance;
   }
 
+  @action
+  Future<void> updateSendingBalance() async {
+    // force the sendingBalance to recompute since unspent coins aren't observable
+    // or at least mobx can't detect the changes
+
+    final currentType = coinTypeToSpendFrom;
+
+    if (currentType == UnspentCoinType.any) {
+      coinTypeToSpendFrom = UnspentCoinType.nonMweb;
+    } else if (currentType == UnspentCoinType.nonMweb) {
+      coinTypeToSpendFrom = UnspentCoinType.any;
+    } else if (currentType == UnspentCoinType.mweb) {
+      coinTypeToSpendFrom = UnspentCoinType.nonMweb;
+    }
+
+    // set it back to the original value:
+    coinTypeToSpendFrom = currentType;
+  }
+
+  @computed
+  String get sendingBalance {
+    // only for electrum, monero, wownero, decred wallets atm:
+    switch (wallet.type) {
+      case WalletType.bitcoin:
+      case WalletType.litecoin:
+      case WalletType.bitcoinCash:
+      case WalletType.monero:
+      case WalletType.wownero:
+      case WalletType.decred:
+        return wallet.formatCryptoAmount(
+            unspentCoinsListViewModel.getSendingBalance(coinTypeToSpendFrom).toString());
+      default:
+        return balance;
+    }
+  }
+
   @computed
   bool get isFiatDisabled => balanceViewModel.isFiatDisabled;
 
@@ -502,14 +538,14 @@ abstract class SendViewModelBase extends WalletChangeListenerViewModel with Stor
         return bitcoin!.createBitcoinTransactionCredentials(
           outputs,
           priority: priority!,
-          feeRate:feesViewModel. customBitcoinFeeRate,
+          feeRate: feesViewModel.customBitcoinFeeRate,
           coinTypeToSpendFrom: coinTypeToSpendFrom,
         );
       case WalletType.litecoin:
         return bitcoin!.createBitcoinTransactionCredentials(
           outputs,
           priority: priority!,
-          feeRate:feesViewModel. customBitcoinFeeRate,
+          feeRate: feesViewModel.customBitcoinFeeRate,
           // if it's an exchange flow then disable sending from mweb coins
           coinTypeToSpendFrom: provider != null ? UnspentCoinType.nonMweb : coinTypeToSpendFrom,
         );

lib/view_model/unspent_coins/unspent_coins_list_view_model.dart

@@ -131,6 +131,36 @@ abstract class UnspentCoinsListViewModelBase with Store {
     }
   }
 
+    List<Unspent> _getSpecificUnspents(UnspentCoinType overrideCoinTypeToSpendFrom) {
+    switch (wallet.type) {
+      case WalletType.monero:
+        return monero!.getUnspents(wallet);
+      case WalletType.wownero:
+        return wownero!.getUnspents(wallet);
+      case WalletType.bitcoin:
+      case WalletType.litecoin:
+      case WalletType.bitcoinCash:
+        return bitcoin!.getUnspents(wallet, coinTypeToSpendFrom: overrideCoinTypeToSpendFrom);
+      case WalletType.decred:
+        return decred!.getUnspents(wallet);
+      default:
+        return List.empty();
+    }
+  }
+
+  @action
+  int getSendingBalance(UnspentCoinType overrideCoinTypeToSpendFrom) {
+    // return items.where((element) => element.isSending).fold(0, (previousValue, element) => previousValue + element.value);
+    // go through all unspent coins and add up the value minus frozen and non sending:
+    int total = 0;
+
+    for (final item in _getSpecificUnspents(overrideCoinTypeToSpendFrom)) {
+      if (item.isFrozen || !item.isSending) continue;
+      total += item.value;
+    }
+    return total;
+  }
+
   @action
   void _updateUnspentCoinsInfo() {
     items.clear();