CW-994 mweb enhancements (cake-tech#2204)

* add mweb block explorer

* potential fix for #2

* fix spending when mweb is disabled

* Update cw_bitcoin/lib/litecoin_wallet.dart

* fix resolving conflict missing brackets

---------

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

Author: fossephate

cw_bitcoin/lib/electrum_wallet.dart

@@ -11,7 +11,6 @@ import 'package:cw_bitcoin/bitcoin_amount_format.dart';
 import 'package:cw_core/utils/print_verbose.dart';
 import 'package:cw_bitcoin/bitcoin_wallet.dart';
 import 'package:cw_bitcoin/litecoin_wallet.dart';
-import 'package:path_provider/path_provider.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'package:blockchain_utils/blockchain_utils.dart';
 import 'package:collection/collection.dart';
@@ -899,6 +898,13 @@ abstract class ElectrumWalletBase
       throw BitcoinTransactionNoDustException();
     }
 
+    // if mweb isn't enabled, don't consider spending mweb coins:
+    if (this is LitecoinWallet) {
+      var mwebEnabled = (this as LitecoinWallet).mwebEnabled;
+      if (!mwebEnabled) {
+        coinTypeToSpendFrom = UnspentCoinType.nonMweb;
+      }
+    }
 
     // If there is only one output, and the amount to send is more than the max spendable amount
     // then it is actually a send all transaction

cw_bitcoin/lib/litecoin_wallet.dart

@@ -886,6 +886,8 @@ abstract class LitecoinWalletBase extends ElectrumWallet with Store {
       if (unspent.vout == 0) {
         unspent.isChange = true;
       }
+
+      // printV("unspent: $unspent ${unspent.vout} ${utxo.value}");
       mwebUnspentCoins.add(unspent);
     });
 
@@ -1140,13 +1142,27 @@ abstract class LitecoinWalletBase extends ElectrumWallet with Store {
   @override
   Future<PendingTransaction> createTransaction(Object credentials) async {
     try {
-      var tx = await super.createTransaction(credentials) as PendingBitcoinTransaction;
+      var creds;
+      if (!mwebEnabled) {
+        BitcoinTransactionCredentials btcCreds = (credentials as BitcoinTransactionCredentials);
+        // sets unspent coin type to nonMweb:
+        creds = BitcoinTransactionCredentials(
+          btcCreds.outputs,
+          priority: btcCreds.priority,
+          feeRate: btcCreds.feeRate,
+          coinTypeToSpendFrom: UnspentCoinType.nonMweb,
+        );
+      } else {
+        creds = credentials;
+      }
+      var tx = await super.createTransaction(creds as Object) as PendingBitcoinTransaction;
       tx.isMweb = mwebEnabled;
 
       if (!mwebEnabled) {
         tx.changeAddressOverride = (await (walletAddresses as LitecoinWalletAddresses)
                 .getChangeAddress(coinTypeToSpendFrom: UnspentCoinType.nonMweb))
             .address;
+
         if (tx.shouldCommitUR()) {
           tx.unsignedPsbt = await buildPsbt(tx, false);
         }
@@ -1165,17 +1181,17 @@ abstract class LitecoinWalletBase extends ElectrumWallet with Store {
         final address = output.address.toLowerCase();
         final extractedAddress = output.extractedAddress?.toLowerCase();
 
-        if (address.contains("mweb")) {
+        if (address.startsWith("ltcmweb")) {
           hasMwebOutput = true;
         }
-        if (!address.contains("mweb")) {
+        if (!address.startsWith("ltcmweb")) {
           hasRegularOutput = true;
         }
         if (extractedAddress != null && extractedAddress.isNotEmpty) {
-          if (extractedAddress.contains("mweb")) {
+          if (extractedAddress.startsWith("ltcmweb")) {
             hasMwebOutput = true;
           }
-          if (!extractedAddress.contains("mweb")) {
+          if (!extractedAddress.startsWith("ltcmweb")) {
             hasRegularOutput = true;
           }
         }

cw_bitcoin/lib/litecoin_wallet_addresses.dart

@@ -188,7 +188,7 @@ abstract class LitecoinWalletAddressesBase extends ElectrumWalletAddresses with
         if (!element.isSending || element.isFrozen) {
           return;
         }
-        if (element.address.contains("mweb")) {
+        if (element.address.startsWith("ltcmweb")) {
           comesFromMweb = true;
         }
       });

lib/view_model/transaction_details_view_model.dart

@@ -59,6 +59,7 @@ abstract class TransactionDetailsViewModelBase with Store {
         if (!canReplaceByFee) _checkForRBF(tx);
         break;
       case WalletType.litecoin:
+        _addLitecoinListItems(tx, dateFormat);
       case WalletType.bitcoinCash:
         _addElectrumListItems(tx, dateFormat);
         break;
@@ -388,6 +389,30 @@ abstract class TransactionDetailsViewModelBase with Store {
     items.addAll(_items);
   }
 
+  void _addLitecoinListItems(TransactionInfo tx, DateFormat dateFormat) {
+    _addElectrumListItems(tx, dateFormat);
+
+    bool isMweb = bitcoin!.txIsMweb(tx);
+
+    final _items = [
+      if (isMweb)
+        BlockExplorerListItem(
+          title: S.current.view_in_block_explorer,
+          value: S.current.view_transaction_on + 'mwebexplorer.com',
+          onTap: () async {
+            try {
+              final uri = Uri.parse('https://www.mwebexplorer.com/blocks/block/${tx.height}');
+              if (await canLaunchUrl(uri))
+                await launchUrl(uri, mode: LaunchMode.externalApplication);
+            } catch (e) {}
+          },
+          key: ValueKey('block_explorer_list_item_mweb_wallet_type_key'),
+        ),
+    ];
+
+    items.addAll(_items);
+  }
+
   void _addHavenListItems(TransactionInfo tx, DateFormat dateFormat) {
     items.addAll([
       StandartListItem(