Mweb enhancements 3 (#1744)

* version 4.20.0

* update build numbers

* UI updates and script fix for ios bundle identifier

* disable mweb for desktop

* change hardcoded ltc server ip address
electrum connection enhancement

* MWEB enhancements 2.0 (#1735)

* additional logging and minor fixes

* additional logging and minor fixes

* addresses pt.1

* Allow Wallet Group Names to be the same as Wallet Names (#1730)

* fix: Issues with imaging

* fix: Allow group names to be the same as wallet names

* fix: Bug with wallet grouping when a wallet is minimized

* fix: Bug with wallet grouping when a wallet is minimized

* logs of fixes and experimental changes, close wallet before opening next

* save

* fix icon

* fixes

* [skip ci] updates

* [skip ci] updates

* updates

* minor optimizations

* fix for when switching between wallets

* [skip ci] updates

* [skip ci] updates

* Update cw_bitcoin/lib/litecoin_wallet.dart

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

* Update cw_bitcoin/lib/litecoin_wallet.dart

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

* mobx

* mostly logging

* stream fix pt.1 [skip ci]

* updates

* some fixes and enhancements

* [skip ci] minor

* potential partial fix for streamsink closed

* fix stream sink closed errors

* fix mweb logo colors

* save

* minor enhancements [skip ci]

* save

* experimental

* minor

* minor [skip ci]

---------

Co-authored-by: David Adegoke <64401859+Blazebrain@users.noreply.github.com>
Co-authored-by: Omar Hatem <omarh.ismail1@gmail.com>

* fix menu list removing from original list

* detach sync status from mwebsyncstatus

* minor

* keep sync status in sync where necessary

* minor

* wip

* appears to work?

* updates

* prevent mwebd from submitting non mweb transactions

* fix unspent coins info not persisting for mweb coins + other minor fixes

* [skip ci] minor

* Polish MWEB card UI

* make sure current chain tip is updated correctly [skip ci]

* [skip ci] review fixes

* [skip ci] detect mweb outputs more thoroughly (fix peg-in commit error)

* fix change address on send ui

* fix qr code scan issue

* get segwit address for pegout even if mweb is selected on the receive screen [skip ci]

* - Fix adding nodes twice
- Fix mempool API parsing error

* (potentially) fix duplicate tx history bug

* [skip ci] fix bc1 address

* don't show contacts prompt on pegin/out + potential unconfirmed balance fixes

* [skip ci] minor cleanup

* fix mweb input detection

* fix showing mweb address for non-mweb transactions

---------

Co-authored-by: OmarHatem <omarh.ismail1@gmail.com>
Co-authored-by: David Adegoke <64401859+Blazebrain@users.noreply.github.com>
Co-authored-by: tuxpizza <tuxsudo@tux.pizza>

lib/bitcoin/cw_bitcoin.dart

@@ -208,7 +208,7 @@ class CWBitcoin extends Bitcoin {
       {UnspentCoinType coinTypeToSpendFrom = UnspentCoinType.any}) {
     final bitcoinWallet = wallet as ElectrumWallet;
     return bitcoinWallet.unspentCoins.where((element) {
-      switch(coinTypeToSpendFrom) {
+      switch (coinTypeToSpendFrom) {
         case UnspentCoinType.mweb:
           return element.bitcoinAddressRecord.type == SegwitAddresType.mweb;
         case UnspentCoinType.nonMweb:
@@ -216,7 +216,6 @@ class CWBitcoin extends Bitcoin {
         case UnspentCoinType.any:
           return true;
       }
-
     }).toList();
   }
 
@@ -399,19 +398,21 @@ class CWBitcoin extends Bitcoin {
           final history = await electrumClient.getHistory(sh);
 
           final balance = await electrumClient.getBalance(sh);
-          dInfoCopy.balance = balance.entries.first.value.toString();
+          dInfoCopy.balance = balance.entries.firstOrNull?.value.toString() ?? "0";
           dInfoCopy.address = address;
           dInfoCopy.transactionsCount = history.length;
 
           list.add(dInfoCopy);
-        } catch (e) {
-          print(e);
+        } catch (e, s) {
+          print("derivationInfoError: $e");
+          print("derivationInfoStack: $s");
         }
       }
     }
 
     // sort the list such that derivations with the most transactions are first:
     list.sort((a, b) => b.transactionsCount.compareTo(a.transactionsCount));
+
     return list;
   }
 
@@ -682,4 +683,15 @@ class CWBitcoin extends Bitcoin {
       return null;
     }
   }
+
+  String? getUnusedSegwitAddress(Object wallet) {
+    try {
+      final electrumWallet = wallet as ElectrumWallet;
+      final segwitAddress = electrumWallet.walletAddresses.allAddresses
+          .firstWhere((element) => !element.isUsed && element.type == SegwitAddresType.p2wpkh);
+      return segwitAddress.address;
+    } catch (_) {
+      return null;
+    }
+  }
 }