Remove Next Address button and logic for electrum wallets. Add disclaimer for electrum wallets on address screen. Change way for generation of current receive and change addresses.

cw_bitcoin/lib/electrum_transaction_info.dart

@@ -116,7 +116,9 @@ class ElectrumTransactionInfo extends TransactionInfo {
   factory ElectrumTransactionInfo.fromElectrumBundle(
       ElectrumTransactionBundle bundle, WalletType type,
       {@required Set<String> addresses, int height}) {
-    final date = DateTime.fromMillisecondsSinceEpoch(bundle.time * 1000);
+    final date = bundle.time != null
+      ? DateTime.fromMillisecondsSinceEpoch(bundle.time * 1000)
+      : DateTime.now();
     var direction = TransactionDirection.incoming;
     var amount = 0;
     var inputAmount = 0;

cw_bitcoin/lib/electrum_wallet.dart

@@ -484,7 +484,7 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
     final original = bitcoin.Transaction.fromHex(transactionHex);
     final ins = <bitcoin.Transaction>[];
     final time = verboseTransaction['time'] as int;
-    final confirmations = verboseTransaction['time'] as int;
+    final confirmations = verboseTransaction['confirmations'] as int ?? 0;
 
     for (final vin in original.ins) {
       final id = HEX.encode(vin.hash.reversed.toList());
@@ -510,13 +510,35 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
 
   @override
   Future<Map<String, ElectrumTransactionInfo>> fetchTransactions() async {
+    final addressHashes = <String, BitcoinAddressRecord>{};
+    final normalizedHistories = <Map<String, dynamic>>[];
+    walletAddresses.addresses.forEach((addressRecord) {
+      if (addressRecord.isHidden) {
+        return;
+      }
+
+      final sh = scriptHash(addressRecord.address, networkType: networkType);
+      addressHashes[sh] = addressRecord;
+    });
     final histories =
-        publicScriptHashes.map((scriptHash) => electrumClient.getHistory(scriptHash));
-    final _historiesWithDetails = await Future.wait(histories)
-        .then((histories) => histories.expand((i) => i).toList())
-        .then((histories) => histories.map((tx) => fetchTransactionInfo(
-            hash: tx['tx_hash'] as String, height: tx['height'] as int)));
-    final historiesWithDetails = await Future.wait(_historiesWithDetails);
+        addressHashes.keys.map((scriptHash) => electrumClient
+          .getHistory(scriptHash)
+          .then((history) => {scriptHash: history}));
+    final historyResults = await Future.wait(histories);
+    historyResults.forEach((history) {
+      history.entries.forEach((historyItem) {
+        if (historyItem.value.isNotEmpty) {
+          final address = addressHashes[historyItem.key];
+          address.setAsUsed();
+          normalizedHistories.addAll(historyItem.value);
+        }
+      });
+    });
+    final historiesWithDetails = await Future.wait(
+      normalizedHistories
+        .map((transaction) => fetchTransactionInfo(
+            hash: transaction['tx_hash'] as String,
+            height: transaction['height'] as int)));
 
     return historiesWithDetails.fold<Map<String, ElectrumTransactionInfo>>(
         <String, ElectrumTransactionInfo>{}, (acc, tx) {
@@ -534,6 +556,7 @@ abstract class ElectrumWalletBase extends WalletBase<ElectrumBalance,
       _isTransactionUpdating = true;
       final transactions = await fetchTransactions();
       transactionHistory.addMany(transactions);
+      walletAddresses.updateReceiveAddresses();
       await transactionHistory.save();
       _isTransactionUpdating = false;
     } catch (e) {

cw_bitcoin/lib/electrum_wallet_addresses.dart

@@ -6,7 +6,6 @@ import 'package:cw_core/wallet_addresses.dart';
 import 'package:cw_core/wallet_info.dart';
 import 'package:flutter/foundation.dart';
 import 'package:mobx/mobx.dart';
-import 'dart:math';
 
 part 'electrum_wallet_addresses.g.dart';
 
@@ -22,44 +21,60 @@ abstract class ElectrumWalletAddressesBase extends WalletAddresses with Store {
       this.sideHd,
       this.electrumClient,
       this.networkType})
-      : super(walletInfo) {
+      : addresses = ObservableList<BitcoinAddressRecord>.of(
+          (initialAddresses ?? []).toSet()),
+        receiveAddresses = ObservableList<BitcoinAddressRecord>.of(
+          (initialAddresses ?? [])
+            .where((addressRecord) => !addressRecord.isHidden && !addressRecord.isUsed)
+        .toSet()),
+        changeAddresses = ObservableList<BitcoinAddressRecord>.of(
+          (initialAddresses ?? [])
+            .where((addressRecord) => addressRecord.isHidden && !addressRecord.isUsed)
+        .toSet()),
+      super(walletInfo) {
     currentReceiveAddressIndex = initialRegularAddressIndex;
     currentChangeAddressIndex = initialChangeAddressIndex;
-    addresses = ObservableList<BitcoinAddressRecord>.of(
-        (initialAddresses ?? []).toSet());
   }
 
   static const defaultReceiveAddressesCount = 22;
   static const defaultChangeAddressesCount = 17;
   static const gap = 20;
 
+  final ObservableList<BitcoinAddressRecord> addresses;
+  final ObservableList<BitcoinAddressRecord> receiveAddresses;
+  final ObservableList<BitcoinAddressRecord> changeAddresses;
+  final ElectrumClient electrumClient;
+  final bitcoin.NetworkType networkType;
+  final bitcoin.HDWallet mainHd;
+  final bitcoin.HDWallet sideHd;
+
   @override
-  @observable
-  String address;
+  @computed
+  String get address => receiveAddresses.first.address;
+
+  @override
+  set address(String addr) => null;
 
   int currentReceiveAddressIndex;
   int currentChangeAddressIndex;
-  ElectrumClient electrumClient;
-  bitcoin.NetworkType networkType;
-  bitcoin.HDWallet mainHd;
-  bitcoin.HDWallet sideHd;
-  ObservableList<BitcoinAddressRecord> addresses;
 
-  List<BitcoinAddressRecord> get receiveAddresses => addresses
-      .where((addr) => !addr.isHidden && !addr.isUsed)
-      .toList();
+  @computed
+  int get totalCountOfReceiveAddresses =>
+    addresses.fold(0, (acc, addressRecord) {
+      if (!addressRecord.isHidden) {
+        return acc + 1;
+      }
+      return acc;
+    });
 
-  List<BitcoinAddressRecord> get changeAddresses => addresses
-      .where((addr) => addr.isHidden && !addr.isUsed)
-      .toList();
-
-  List<BitcoinAddressRecord> get totalReceiveAddresses => addresses
-      .where((addr) => !addr.isHidden)
-      .toList();
-
-  List<BitcoinAddressRecord> get totalChangeAddresses => addresses
-      .where((addr) => addr.isHidden)
-      .toList();
+  @computed
+  int get totalCountOfChangeAddresses =>
+    addresses.fold(0, (acc, addressRecord) {
+      if (addressRecord.isHidden) {
+        return acc + 1;
+      }
+      return acc;
+    });
 
   Future<void> discoverAddresses() async {
     await _discoverAddresses(mainHd, false);
@@ -70,60 +85,39 @@ abstract class ElectrumWalletAddressesBase extends WalletAddresses with Store {
   @override
   Future<void> init() async {
     await _generateInitialAddresses();
+    updateReceiveAddresses();
+    updateChangeAddresses();
+    await updateAddressesInBox();
 
-    if (receiveAddresses.isEmpty) {
-      final newAddresses = await _createNewAddresses(
-        gap,
-        hd: mainHd,
-        startIndex: totalReceiveAddresses.length > 0 
-          ? totalReceiveAddresses.length - 1
-          : 0,
-        isHidden: false);
-      _addAddresses(newAddresses);
-    } else if (currentReceiveAddressIndex >= receiveAddresses.length) {
+    if (currentReceiveAddressIndex >= receiveAddresses.length) {
       currentReceiveAddressIndex = 0;
     }
 
-    address = receiveAddresses[currentReceiveAddressIndex].address;
-    await updateAddressesInBox();
-  }
-
-  @action
-  Future<void> nextReceiveAddress() async {
-    if (receiveAddresses.isEmpty) {
-      final newAddresses = await _createNewAddresses(
-        gap,
-        hd: mainHd,
-        startIndex: totalReceiveAddresses.length > 0 
-          ? totalReceiveAddresses.length - 1
-          : 0,
-        isHidden: false);
-      _addAddresses(newAddresses);
-    } else if (currentReceiveAddressIndex >= receiveAddresses.length) {
-      currentReceiveAddressIndex = 0;
+    if (currentChangeAddressIndex >= changeAddresses.length) {
+      currentChangeAddressIndex = 0;
     }
-
-    address = receiveAddresses[currentReceiveAddressIndex].address;
-    currentReceiveAddressIndex += 1;
-    await updateAddressesInBox();
   }
 
   @action
   Future<String> getChangeAddress() async {
+    updateChangeAddresses();
+    
     if (changeAddresses.isEmpty) {
       final newAddresses = await _createNewAddresses(
         gap,
         hd: sideHd,
-        startIndex: totalChangeAddresses.length > 0
-          ? totalChangeAddresses.length -  1
+        startIndex: totalCountOfChangeAddresses > 0
+          ? totalCountOfChangeAddresses -  1
           : 0,
         isHidden: true);
       _addAddresses(newAddresses);
-    } else if (currentChangeAddressIndex >= changeAddresses.length) {
+    }
+
+    if (currentChangeAddressIndex >= changeAddresses.length) {
       currentChangeAddressIndex = 0;
     }
 
-    
+    updateChangeAddresses();
     final address = changeAddresses[currentChangeAddressIndex].address;
     currentChangeAddressIndex += 1;
     return address;
@@ -153,18 +147,20 @@ abstract class ElectrumWalletAddressesBase extends WalletAddresses with Store {
     }
   }
 
-  void randomizeAddress() {
-    const minCountOfVisibleAddresses = 5;
-    final random = Random();
-    var availableAddresses = addresses
-      .where((addr) => !addr.isHidden)
-      .toList();
+  @action
+  void updateReceiveAddresses() {
+    receiveAddresses.removeRange(0, receiveAddresses.length);
+    final newAdresses = addresses
+          .where((addressRecord) => !addressRecord.isHidden && !addressRecord.isUsed);
+    receiveAddresses.addAll(newAdresses);
+  }
 
-    if (availableAddresses.length < minCountOfVisibleAddresses) {
-      availableAddresses = addresses;
-    }
-
-    address = availableAddresses[random.nextInt(availableAddresses.length)].address;
+  @action
+  void updateChangeAddresses() {
+    changeAddresses.removeRange(0, changeAddresses.length);
+    final newAdresses = addresses
+          .where((addressRecord) => addressRecord.isHidden && !addressRecord.isUsed);
+    changeAddresses.addAll(newAdresses);
   }
 
   Future<void> _discoverAddresses(bitcoin.HDWallet hd, bool isHidden) async {
@@ -187,7 +183,7 @@ abstract class ElectrumWalletAddressesBase extends WalletAddresses with Store {
     
     while(hasAddrUse) {
       final addr = addrs.last.address;
-      hasAddrUse = await _validateAddressUsing(addr);
+      hasAddrUse = await _hasAddressUsed(addr);
 
       if (!hasAddrUse) {
         break;
@@ -264,9 +260,9 @@ abstract class ElectrumWalletAddressesBase extends WalletAddresses with Store {
     this.addresses.addAll(addressesSet);
   }
 
-  Future<bool> _validateAddressUsing(String address) async {
+  Future<bool> _hasAddressUsed(String address) async {
     final sh = scriptHash(address, networkType: networkType);
-    final balance = await electrumClient.getBalance(sh);
-    return balance.isEmpty;
+    final transactionHistory = await electrumClient.getHistory(sh);
+    return transactionHistory.isNotEmpty;
   }
 }

lib/bitcoin/cw_bitcoin.dart

@@ -54,18 +54,6 @@ class CWBitcoin extends Bitcoin {
 		await bitcoinWallet.walletAddresses.generateNewAddress();
 	}
 	
-	@override
-	Future<void> nextAddress(Object wallet) {
-		final bitcoinWallet = wallet as ElectrumWallet;
-		bitcoinWallet.walletAddresses.nextReceiveAddress();
-	}
-
-	@override
-	Future<void> randomAddress(Object wallet) {
-		final bitcoinWallet = wallet as ElectrumWallet;
-		bitcoinWallet.walletAddresses.randomizeAddress();
-	}
-	
 	@override
 	Object createBitcoinTransactionCredentials(List<Output> outputs, TransactionPriority priority)
 		=> BitcoinTransactionCredentials(

lib/src/screens/dashboard/widgets/address_page.dart

@@ -125,14 +125,15 @@ class AddressPage extends StatelessWidget {
                           ),
                         ),
                       )
-                    : PrimaryButton(
-                        onPressed: () => addressListViewModel.nextAddress(),
-                        text: 'Next address',
-                        color: Theme.of(context).buttonColor,
-                        textColor: Theme.of(context)
-                            .accentTextTheme
-                            .display3
-                            .backgroundColor);
+                    : Text(
+                        S.of(context).electrum_address_disclaimer,
+                        textAlign: TextAlign.center,
+                        style: TextStyle(
+                            fontSize: 15,
+                            color: Theme.of(context)
+                              .accentTextTheme
+                              .display2
+                              .backgroundColor));
               })
             ],
           ),

lib/view_model/wallet_address_list/wallet_address_list_view_model.dart

@@ -212,26 +212,4 @@ abstract class WalletAddressListViewModelBase with Store {
 
     _baseItems.add(WalletAddressListHeader());
   }
-
-  @action
-  void nextAddress() {
-    final wallet = _wallet;
-
-    if (wallet.type == WalletType.bitcoin
-      || wallet.type == WalletType.litecoin) {
-      bitcoin.nextAddress(wallet);
-      wallet.save();
-    }
-  }
-
-  @action
-  void generateRandomAddress() {
-    final wallet = _wallet;
-
-    if (wallet.type == WalletType.bitcoin
-      || wallet.type == WalletType.litecoin) {
-      bitcoin.randomAddress(wallet);
-      wallet.save();
-    } 
-  }
 }

res/values/strings_de.arb

@@ -522,5 +522,6 @@
   "third_intro_content" : "Yats leben auch außerhalb von Cake Wallet. Jede Wallet-Adresse auf der Welt kann durch ein Yat ersetzt werden!",
   "learn_more" : "Erfahren Sie mehr",
 
-  "new_template" : "neue Vorlage"
+  "new_template" : "neue Vorlage",
+  "electrum_address_disclaimer": "Wir generieren jedes Mal neue Adressen, wenn Sie eine verwenden, aber vorherige Adressen funktionieren weiterhin"
 }

res/values/strings_en.arb

@@ -523,5 +523,6 @@
   "third_intro_content" : "Yats live outside of Cake Wallet, too. Any wallet address on earth can be replaced with a Yat!",
   "learn_more" : "Learn More",
 
-  "new_template" : "New Template"
+  "new_template" : "New Template",
+  "electrum_address_disclaimer": "We generate new addresses each time you use one, but previous addresses continue to work"
 }

res/values/strings_es.arb

@@ -522,5 +522,6 @@
   "third_intro_content" : "Los Yats también viven fuera de Cake Wallet. Cualquier dirección de billetera en la tierra se puede reemplazar con un Yat!",
   "learn_more" : "Aprende más",
 
-  "new_template" : "Nueva plantilla"
+  "new_template" : "Nueva plantilla",
+  "electrum_address_disclaimer": "Generamos nuevas direcciones cada vez que usa una, pero las direcciones anteriores siguen funcionando"
 }

res/values/strings_hi.arb

@@ -522,5 +522,6 @@
   "third_intro_content" : "Yats Cake Wallet के बाहर भी रहता है। धरती पर किसी भी वॉलेट पते को Yat से बदला जा सकता है!",
   "learn_more" : "और अधिक जानें",
 
-  "new_template" : "नया टेम्पलेट"
+  "new_template" : "नया टेम्पलेट",
+  "electrum_address_disclaimer": "हर बार जब आप एक का उपयोग करते हैं तो हम नए पते उत्पन्न करते हैं, लेकिन पिछले पते काम करना जारी रखते हैं"
 }

res/values/strings_hr.arb

@@ -522,5 +522,6 @@
   "third_intro_content" : "Yats žive i izvan Cake Wallet -a. Bilo koja adresa novčanika na svijetu može se zamijeniti Yat!",
   "learn_more" : "Saznajte više",
 
-  "new_template" : "novi predložak"
+  "new_template" : "novi predložak",
+  "electrum_address_disclaimer": "Minden egyes alkalommal új címeket generálunk, de a korábbi címek továbbra is működnek"
 }

res/values/strings_it.arb

@@ -522,5 +522,6 @@
   "third_intro_content" : "Anche Yats vive fuori da Cake Wallet. Qualsiasi indirizzo di portafoglio sulla terra può essere sostituito con un Yat!",
   "learn_more" : "Impara di più",
 
-  "new_template" : "Nuovo modello"
+  "new_template" : "Nuovo modello",
+  "electrum_address_disclaimer": "Generiamo nuovi indirizzi ogni volta che ne utilizzi uno, ma gli indirizzi precedenti continuano a funzionare"
 }

res/values/strings_ja.arb

@@ -522,5 +522,6 @@
   "third_intro_content" : "YatsはCakeWalletの外にも住んでいます。 地球上のどのウォレットアドレスもYatに置き換えることができます！",
   "learn_more" : "もっと詳しく知る",
 
-  "new_template" : "新しいテンプレート" 
+  "new_template" : "新しいテンプレート",
+  "electrum_address_disclaimer": "使用するたびに新しいアドレスが生成されますが、以前のアドレスは引き続き機能します"
 }

res/values/strings_ko.arb

@@ -522,5 +522,6 @@
   "third_intro_content" : "Yats는 Cake Wallet 밖에서도 살고 있습니다. 지구상의 모든 지갑 주소는 Yat!",
   "learn_more" : "더 알아보기",
 
-  "new_template" : "새 템플릿"
+  "new_template" : "새 템플릿",
+  "electrum_address_disclaimer": "사용할 때마다 새 주소가 생성되지만 이전 주소는 계속 작동합니다."
 }

res/values/strings_nl.arb

@@ -522,5 +522,6 @@
   "third_intro_content" : "Yats wonen ook buiten Cake Wallet. Elk portemonnee-adres op aarde kan worden vervangen door een Yat!",
   "learn_more" : "Kom meer te weten",
 
-  "new_template" : "Nieuwe sjabloon"
+  "new_template" : "Nieuwe sjabloon",
+  "electrum_address_disclaimer": "We generate new addresses each time you use one, but previous addresses continue to work"
 }

res/values/strings_pl.arb

@@ -522,5 +522,6 @@
   "third_intro_content" : "Yats mieszkają również poza Cake Wallet. Każdy adres portfela na ziemi można zastąpić Yat!",
   "learn_more" : "Ucz się więcej",
 
-  "new_template" : "Nowy szablon"
+  "new_template" : "Nowy szablon",
+  "electrum_address_disclaimer": "Za każdym razem, gdy korzystasz z jednego z nich, generujemy nowe adresy, ale poprzednie adresy nadal działają"
 }

res/values/strings_pt.arb

@@ -522,5 +522,6 @@
   "third_intro_content" : "Yats também mora fora da Cake Wallet. Qualquer endereço de carteira na Terra pode ser substituído por um Yat!",
   "learn_more" : "Saber mais",
 
-  "new_template" : "Novo modelo"
+  "new_template" : "Novo modelo",
+  "electrum_address_disclaimer": "Geramos novos endereços cada vez que você usa um, mas os endereços anteriores continuam funcionando"
 }

res/values/strings_ru.arb

@@ -522,5 +522,6 @@
   "third_intro_content" : "Yat находятся за пределами Cake Wallet. Любой адрес кошелька на земле можно заменить на Yat!",
   "learn_more" : "Узнать больше",
 
-  "new_template" : "Новый шаблон"
+  "new_template" : "Новый шаблон",
+  "electrum_address_disclaimer": "Мы генерируем новые адреса каждый раз, когда вы их используете, но предыдущие адреса продолжают работать."
 }

res/values/strings_uk.arb

@@ -521,5 +521,6 @@
   "third_intro_content" : "Yat знаходиться за межами Cake Wallet. Будь-яку адресу гаманця на землі можна замінити на Yat!",
   "learn_more" : "Дізнатися більше",
 
-  "new_template" : "Новий шаблон"
+  "new_template" : "Новий шаблон",
+  "electrum_address_disclaimer": "Ми створюємо нові адреси щоразу, коли ви використовуєте їх, але попередні адреси продовжують працювати"
 }

res/values/strings_zh.arb

@@ -520,5 +520,6 @@
   "third_intro_content" : "Yats 也住在 Cake Wallet 之外。 地球上任何一個錢包地址都可以用一個Yat來代替！",
   "learn_more" : "了解更多",
 
-  "new_template" : "新模板"
+  "new_template" : "新模板",
+  "electrum_address_disclaimer": "每次您使用一个地址时，我们都会生成新地址，但之前的地址仍然有效"
 }

tool/configure.dart

@@ -74,8 +74,6 @@ abstract class Bitcoin {
   TransactionPriority deserializeBitcoinTransactionPriority(int raw); 
   int getFeeRate(Object wallet, TransactionPriority priority);
   Future<void> generateNewAddress(Object wallet);
-  Future<void> nextAddress(Object wallet);
-  Future<void> randomAddress(Object wallet);
   Object createBitcoinTransactionCredentials(List<Output> outputs, TransactionPriority priority);
 
   List<String> getAddresses(Object wallet);