cw-1683-prepare-zano-removal (#3668)

### cw_core/lib/db/sqlite.dart
@@ -66,7 +66,7 @@ Future<void> _initDb({String? pathOverride}) async {
   await db?.close();
   db = await openDatabase(
     dbFile.path,
-    version: 14,
+    version: 15,
     onUpgrade: (db, oldVersion, newVersion) async {
       printV("migrating: $oldVersion, $newVersion");
       if (oldVersion <= 1) {
@@ -193,6 +193,9 @@ CREATE TABLE IF NOT EXISTS BalanceCardStyleSettings (
 
         await _migrateBitcoinCardStylesForAccounts(db);
       }
+      if(oldVersion <= 14) {
+        await _createDeprecatedWalletSeedTable(db);
+      }
     },
     onCreate: (Database db, int version) async {
       await db.execute('''
@@ -299,6 +302,8 @@ CREATE TABLE BalanceCardStyleSettings (
       await _createTronTokenTable(db);
       await _createImportedNFTTable(db);
       await _createWalletInfoAccountTable(db);
+    await _createDeprecatedWalletSeedTable(db);
+
     },
   );
 }
@@ -589,3 +594,15 @@ isDefault BOOLEAN DEFAULT FALSE
 );
         """);
 }
+
+
+Future<void> _createDeprecatedWalletSeedTable(Database db) async {
+  await db.execute("""
+CREATE TABLE DeprecatedWalletSeeds (
+walletInfoId INTEGER PRIMARY KEY,
+seed TEXT NOT NULL,
+passphrase TEXT NOT NULL,
+FOREIGN KEY (walletInfoId) REFERENCES WalletInfo(walletInfoId)
+);
+""");
+}

### cw_core/lib/wallet_info.dart
@@ -793,7 +793,8 @@ class WalletInfo {
   }
 
   static Future<int> delete(WalletInfo walletInfo) async {
-    return await db!.delete(tableName, where: 'id = ?', whereArgs: [walletInfo.id]);
+    final deleted = await db!.delete(tableName, where: 'id = ?', whereArgs: [walletInfo.id]);
+    return deleted;
   }
 
   static Future<List<WalletInfo>> selectList(String where, List<dynamic> whereArgs,

### cw_zano/lib/zano_wallet.dart
@@ -122,6 +122,7 @@ abstract class ZanoWalletBase
   bool _isTransactionUpdating;
   bool _hasSyncAfterStartup;
   Timer? _autoSaveTimer;
+  bool _isClosed = false;
 
   /// number of transactions in each request
   static final int _txChunkSize = (pow(2, 32) - 1).toInt();
@@ -422,6 +423,7 @@ abstract class ZanoWalletBase
 
   @override
   Future<void> close({bool shouldCleanup = true}) async {
+    _isClosed = true;
     closeWallet(null);
     _updateSyncInfoTimer?.cancel();
     _autoSaveTimer?.cancel();
@@ -534,6 +536,9 @@ abstract class ZanoWalletBase
     await walletAddresses.init();
     await walletAddresses.updateAddress(address);
     await updateTransactions();
+    if (_isClosed) {
+      return;
+    }
     _autoSaveTimer = Timer.periodic(Duration(seconds: _autoSaveIntervalSeconds), (_) async {
       await save();
     });

### cw_zano/lib/zano_wallet_api.dart
@@ -458,6 +458,13 @@ mixin ZanoWalletApi {
 
   static Map<String, CreateWalletResult> openWalletCache = {};
 
+  static Future<void> closeCachedWallet(String path) async {
+    final cached = openWalletCache.remove(path);
+    if (cached != null) {
+      await _closeWallet(cached.walletId);
+    }
+  }
+
   Future<TransferResult> transfer(
       List<Destination> destinations, BigInt fee, String comment) async {
     final params = TransferParams(

### cw_zano/lib/zano_wallet_service.dart
@@ -112,6 +112,7 @@ class ZanoWalletService extends WalletService<
 
   @override
   Future<void> remove(String wallet) async {
+    await ZanoWalletApi.closeCachedWallet(await pathForWallet(name: wallet, type: getType()));
     final path = await pathForWalletDir(name: wallet, type: getType());
     final file = Directory(path);
     final isExist = file.existsSync();

### lib/entities/default_settings_migration.dart
@@ -2,7 +2,10 @@ import 'dart:convert';
 import 'dart:io' show Directory, File, Platform;
 
 import 'package:cake_wallet/bitcoin/bitcoin.dart';
+import "package:cake_wallet/core/key_service.dart";
 import 'package:cake_wallet/core/secure_storage.dart';
+import "package:cake_wallet/decred/decred.dart";
+import "package:cake_wallet/di.dart";
 import 'package:cake_wallet/entities/balance_display_mode.dart';
 import 'package:cake_wallet/entities/contact.dart';
 import 'package:cake_wallet/entities/exchange_api_mode.dart';
@@ -14,6 +17,9 @@ import 'package:cake_wallet/entities/preferences_key.dart';
 import 'package:cake_wallet/entities/secret_store_key.dart';
 import 'package:cake_wallet/monero/monero.dart';
 import 'package:cake_wallet/new-ui/model/charts/charts_asset.dart';
+import "package:cake_wallet/store/settings_store.dart";
+import "package:cake_wallet/zano/zano.dart";
+import "package:cw_core/cake_hive.dart";
 import 'package:cake_wallet/wownero/wownero.dart';
 import 'package:collection/collection.dart';
 import 'package:cw_core/crypto_currency.dart';
@@ -23,8 +29,10 @@ import 'package:cw_core/node_list.dart';
 import 'package:cw_core/pathForWallet.dart';
 import 'package:cw_core/root_dir.dart';
 import 'package:cw_core/spl_token.dart';
+import "package:cw_core/unspent_coins_info.dart";
 import 'package:cw_core/utils/print_verbose.dart';
 import 'package:cw_core/wallet_info.dart';
+import "package:cw_core/wallet_service.dart";
 import 'package:cw_core/wallet_type.dart';
 import 'package:encrypt/encrypt.dart' as encrypt;
 import 'package:hive/hive.dart';
@@ -1377,4 +1385,4 @@ Future<void> _addTbbTokenToExistingSolanaWallets() async {
   } catch (e) {
     printV("Error in TBB migration: $e");
   }
-}
+}
\ No newline at end of file

### lib/entities/preferences_key.dart
@@ -1,3 +1,5 @@
+import "package:cw_core/wallet_type.dart";
+
 class PreferencesKey {
   static const currentWalletType = 'current_wallet_type';
   static const currentWalletName = 'current_wallet_name';
@@ -147,4 +149,6 @@ class PreferencesKey {
   static const balanceHideCounter = "balance_hide_counter";
   static const zcashMigrationModalViewed = "zcash_migration_modal_viewed";
   static const showCiBuildOverlay = "show_ci_build_overlay";
+  static String deprecationPopupViewed(WalletType type) =>
+      "deprecation_popup_viewed_${walletTypeToString(type)}";
 }

### lib/new-ui/new_dashboard.dart
@@ -7,6 +7,7 @@ import "package:cake_wallet/new-ui/page_open_listener.dart";
 import 'package:cake_wallet/new-ui/pages/charts_page.dart';
 import 'package:cake_wallet/new-ui/pages/home_page.dart';
 import 'package:cake_wallet/new-ui/widgets/changelog_modal.dart';
+import "package:cake_wallet/new-ui/widgets/wallet_removal_popup.dart";
 import 'package:cake_wallet/src/screens/contact/contact_list_page.dart';
 import 'package:cake_wallet/src/screens/dashboard/pages/cake_features_page.dart';
 import 'package:cake_wallet/src/screens/dashboard/widgets/new_main_navbar_widget.dart';
@@ -55,6 +56,7 @@ class _NewDashboardState extends State<NewDashboard> {
       setState(() {
         _selectedPage = 0;
       });
+      _showWalletRemovalPopup(context);
     });
 
     Future.delayed(Duration(milliseconds: 300)).then((_) {
@@ -63,6 +65,7 @@ class _NewDashboardState extends State<NewDashboard> {
       });
     });
     _showVulnerableSeedsPopup(context);
+    _showWalletRemovalPopup(context);
   }
 
   @override
@@ -182,4 +185,14 @@ class _NewDashboardState extends State<NewDashboard> {
       );
     }
   }
+
+  Future<void> _showWalletRemovalPopup(BuildContext context) async {
+    if(await widget.dashboardViewModel.shouldShowRemovalPopup()) {
+      await Future.delayed(const Duration(seconds: 1));
+      final toBeRemoved = await widget.dashboardViewModel.walletsToBeRemoved;
+      if(context.mounted) {
+        await showPopUp<void>(context: context, builder: (context)=>WalletRemovalPopup(affectedWallets: toBeRemoved,));
+      }
+    }
+  }
 }

### lib/new-ui/widgets/wallet_removal_popup.dart
@@ -0,0 +1,102 @@
+import "package:cake_wallet/entities/new_ui_entities/list_item/list_item_regular_row.dart";
+import "package:cake_wallet/generated/i18n.dart";
+import "package:cake_wallet/new-ui/widgets/new_primary_button.dart";
+import "package:cake_wallet/src/widgets/cake_image_widget.dart";
+import "package:cake_wallet/src/widgets/new_list_row/new_list_section.dart";
+import "package:cake_wallet/themes/core/theme_extension.dart";
+import "package:cw_core/currency_for_wallet_type.dart";
+import "package:cw_core/wallet_info.dart";
+import "package:cw_core/wallet_type.dart";
+import "package:flutter/material.dart";
+
+class WalletRemovalPopup extends StatelessWidget {
+  const WalletRemovalPopup({required this.affectedWallets, super.key});
+
+  final List<WalletInfo> affectedWallets;
+
+  @override
+  Widget build(BuildContext context) {
+    final types = affectedWallets.map((item) => item.type).toSet().toList();
+    final iconPaths = types.map((item) => walletTypeToCryptoCurrency(item).iconPath ?? "").toList();
+    final typeNames = types.map(walletTypeToDisplayName).toList();
+
+    return Center(
+      child: Material(
+        color: Colors.transparent,
+        child: Padding(
+          padding: const EdgeInsets.symmetric(horizontal: 18),
+          child: Container(
+            decoration: BoxDecoration(
+              color: Theme.of(context).colorScheme.surface,
+              borderRadius: BorderRadius.circular(18),
+            ),
+            child: SingleChildScrollView(
+              child: Padding(
+                padding: const EdgeInsets.all(16),
+                child: Column(
+                  mainAxisSize: MainAxisSize.min,
+                  spacing: 18,
+                  children: [
+                    Row(
+                      mainAxisAlignment: MainAxisAlignment.center,
+                      spacing: 8,
+                      children: iconPaths
+                          .map(
+                            (item) => CakeImageWidget(
+                              imageUrl: item,
+                              width: 64,
+                              height: 64,
+                            ),
+                          )
+                          .toList(),
+                    ),
+                    Text(
+                      textAlign: TextAlign.center,
+                      S.of(context).support_will_soon_be_removed(typeNames.join(", ")),
+                      style: const TextStyle(fontSize: 20, fontWeight: FontWeight.w500),
+                    ),
+                    Text(
+                      textAlign: TextAlign.center,
+                      types.map(deprecationReasonForType).whereType<String>().join("\n\n"),
+                    ),
+                    Text(
+                      textAlign: TextAlign.center,
+                      S.of(context).make_sure_you_migrated(typeNames.join("/")),
+                      style: TextStyle(
+                        fontWeight: FontWeight.w500,
+                        color: context.currentTheme.customColors.warningOutlineColor,
+                      ),
+                    ),
+                    NewListSections(
+                      sections: {
+                        "": affectedWallets
+                            .map(
+                              (item) => ListItemRegularRow(
+                                iconPath: walletTypeToCryptoCurrency(item.type).iconPath ?? "",
+                                keyValue: item.name,
+                                label: item.name,
+                                showArrow: false,
+                              ),
+                            )
+                            .toList(),
+                      },
+                    ),
+                    NewPrimaryButton(
+                      onPressed: Navigator.of(context).pop,
+                      text: S.of(context).close,
+                      color: Theme.of(context).colorScheme.primary,
+                      textColor: Theme.of(context).colorScheme.onPrimary,
+                    ),
+                  ],
+                ),
+              ),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  String? deprecationReasonForType(WalletType type) =>
+      switch (type) { WalletType.zano => S.current.zano_removal_reason, _ => null };
+}

### lib/view_model/dashboard/dashboard_view_model.dart
@@ -1697,4 +1697,25 @@ abstract class DashboardViewModelBase with Store {
   Future<void> refreshDashboard() async {
     reconnect();
   }
+
+
+  static const walletTypesToBeRemoved = [
+    WalletType.zano,
+    WalletType.decred,
+  ];
+
+  Future<bool> shouldShowRemovalPopup() async {
+    final show = (await WalletInfo.getAll()).any((item) =>
+        walletTypesToBeRemoved.contains(item.type) &&
+        !(sharedPreferences.getBool(PreferencesKey.deprecationPopupViewed(item.type)) ?? false),);
+    for (final type in walletTypesToBeRemoved) {
+      await sharedPreferences.setBool(PreferencesKey.deprecationPopupViewed(type), true);
+    }
+    // if user is actively using a wallet type that's about to be removed, keep nagging them
+    return show || walletTypesToBeRemoved.contains(wallet.type);
+  }
+
+  Future<List<WalletInfo>> get walletsToBeRemoved async => (await WalletInfo.getAll())
+      .where((item) => walletTypesToBeRemoved.contains(item.type))
+      .toList();
 }

### res/values/strings_en.arb
@@ -668,6 +668,7 @@
   "low_fee_alert": "You currently are using a low network fee priority. This could cause long waits, different rates, or canceled trades. We recommend setting a higher fee for a better experience.",
   "low_kyc": "Low KYC",
   "made_easy": "made easy",
+  "make_sure_you_migrated": "Please be sure you've backed up your seed phrase from Recovery & Keys in the meantime, and consider migrating to another ${walletTypes} wallet.",
   "manage_nodes": "Manage nodes",
   "manage_pow_nodes": "Manage PoW nodes",
   "manage_providers": "Manage providers",
@@ -1180,6 +1181,7 @@
   "show_recovery_phrase": "Show me my Recovery Phrase",
   "show_recovery_phrase_and_keys": "Show my Recovery Phrase & Keys",
   "show_seed": "Show seed",
+  "show_seed_confirmation": "View seed of this wallet?",
   "show_zcash_card": "Show zcash missing funds card",
   "sign_all": "Sign All",
   "sign_message": "Sign Message",
@@ -1239,6 +1241,7 @@
   "support_title_guides": "Cake Wallet docs",
   "support_title_live_chat": "Live support",
   "support_title_other_links": "Other support links",
+  "support_will_soon_be_removed": "Support for ${walletTypes} will soon be removed",
   "supported": "Supported",
   "swap": "Swap",
   "swap_from_network": "Swap from ${network}",
@@ -1578,6 +1581,7 @@
   "youCanGoBackToYourDapp": "You can go back to your dApp now",
   "your": "Your",
   "yy": "YY",
+  "zano_removal_reason": "Zano has undergone multiple hard-forks to resolve a critical network issue, including a rollback of the chain. Due to serious issues with the forks and the maintenance burden it brings to us, we will be removing Zano from Cake Wallet in a future release.",
   "zcash_card_description": "If you don't see your full balance Cake Wallet can attempt to sweep funds from internal change addresses used by some wallets.",
   "zcash_card_dismiss": "Dismiss",
   "zcash_card_enable_later": "You can always enable this card later in settings",

### tool/configure.dart
@@ -2077,13 +2077,13 @@ Future<void> generateWalletTypes({
     outputContent += '\tWalletType.nano,\n';
   }
 
-  if (hasDecred) {
-    outputContent += '\tWalletType.decred,\n';
-  }
+  // if (hasDecred) {
+  //   outputContent += '\tWalletType.decred,\n';
+  // }
 
-  if (hasZano) {
-    outputContent += '\tWalletType.zano,\n';
-  }
+  // if (hasZano) {
+  //   outputContent += '\tWalletType.zano,\n';
+  // }
 
   if (hasBanano) {
     outputContent += '\tWalletType.banano,\n';