decred: Add restore from seed.

cw_decred/lib/api/libdcrwallet.dart

@@ -28,11 +28,15 @@ void initLibdcrwallet(String logDir) {
 /// createWalletAsync calls the libdcrwallet's createWallet function
 /// asynchronously.
 Future<void> createWalletAsync(
-    {required String name, required String dataDir, required String password}) {
+    {required String name,
+    required String dataDir,
+    required String password,
+    String? mnemonic}) {
   final args = <String, String>{
     "name": name,
     "dataDir": dataDir,
     "password": password,
+    "mnemonic": mnemonic ?? "",
   };
   return compute(createWalletSync, args);
 }
@@ -43,11 +47,13 @@ void createWalletSync(Map<String, String> args) {
   final name = args["name"]!.toCString();
   final dataDir = args["dataDir"]!.toCString();
   final password = args["password"]!.toCString();
+  final mnemonic = args["mnemonic"]!.toCString();
   final network = "testnet".toCString();
 
   executePayloadFn(
-    fn: () => dcrwalletApi.createWallet(name, dataDir, network, password),
-    ptrsToFree: [name, dataDir, network, password],
+    fn: () =>
+        dcrwalletApi.createWallet(name, dataDir, network, password, mnemonic),
+    ptrsToFree: [name, dataDir, network, password, mnemonic],
   );
 }
 

cw_decred/lib/wallet.dart

@@ -78,7 +78,6 @@ abstract class DecredWalletBase extends WalletBase<DecredBalance,
 
   @override
   Object get keys {
-    // throw UnimplementedError();
     return {};
   }
 

cw_decred/lib/wallet_service.dart

@@ -95,7 +95,16 @@ class DecredWalletService extends WalletService<
   Future<DecredWallet> restoreFromSeed(
       DecredRestoreWalletFromSeedCredentials credentials,
       {bool? isTestnet}) async {
-    throw UnimplementedError();
+    await createWalletAsync(
+      name: credentials.walletInfo!.name,
+      dataDir: credentials.walletInfo!.dirPath,
+      password: credentials.password!,
+      mnemonic: credentials.mnemonic,
+    );
+    final wallet = DecredWallet(credentials.walletInfo!, credentials.password!,
+        this.unspentCoinsInfoSource);
+    await wallet.init();
+    return wallet;
   }
 
   @override

lib/core/seed_validator.dart

@@ -9,6 +9,7 @@ import 'package:cake_wallet/polygon/polygon.dart';
 import 'package:cake_wallet/solana/solana.dart';
 import 'package:cake_wallet/tron/tron.dart';
 import 'package:cake_wallet/wownero/wownero.dart';
+import 'package:cake_wallet/decred/decred.dart';
 import 'package:cake_wallet/utils/language_list.dart';
 import 'package:cw_core/wallet_type.dart';
 
@@ -46,6 +47,8 @@ class SeedValidator extends Validator<MnemonicItem> {
         return tron!.getTronWordList(language);
       case WalletType.wownero:
           return wownero!.getWowneroWordList(language);
+      case WalletType.decred:
+        return decred!.getDecredWordList();
       case WalletType.none:
         return [];
     }

lib/decred/cw_decred.dart

@@ -116,4 +116,7 @@ class CWDecred extends Decred {
     // TODO: Remove this and just rescan from the wallet birthday.
     return (minutesDiff / 5).toInt();
   }
+
+	@override
+	List<String> getDecredWordList() => wordlist;
 }

lib/src/screens/restore/wallet_restore_page.dart

@@ -284,13 +284,19 @@ class WalletRestorePage extends BasePage {
 
     // bip39:
     final validBip39SeedLengths = [12, 18, 24];
-    final nonBip39WalletTypes = [WalletType.monero, WalletType.wownero, WalletType.haven];
+    final nonBip39WalletTypes = [WalletType.monero, WalletType.wownero, WalletType.haven, WalletType.decred];
     // if it's a bip39 wallet and the length is not valid return false
     if (!nonBip39WalletTypes.contains(walletRestoreViewModel.type) &&
         !(validBip39SeedLengths.contains(seedWords.length))) {
       return false;
     }
 
+    if ((walletRestoreViewModel.type == WalletType.decred) &&
+            seedWords.length !=
+                WalletRestoreViewModelBase.decredSeedMnemonicLength) {
+      return false;
+    }
+
     final words =
         walletRestoreFromSeedFormKey.currentState!.seedWidgetStateKey.currentState!.words.toSet();
     return seedWords.toSet().difference(words).toSet().isEmpty;

lib/view_model/wallet_keys_view_model.dart

@@ -22,7 +22,8 @@ abstract class WalletKeysViewModelBase with Store {
   WalletKeysViewModelBase(this._appStore)
       : title = _appStore.wallet!.type == WalletType.bitcoin ||
                 _appStore.wallet!.type == WalletType.litecoin ||
-                _appStore.wallet!.type == WalletType.bitcoinCash
+                _appStore.wallet!.type == WalletType.bitcoinCash ||
+                _appStore.wallet!.type == WalletType.decred
             ? S.current.wallet_seed
             : S.current.wallet_keys,
         _walletName = _appStore.wallet!.type.name,
@@ -226,6 +227,7 @@ abstract class WalletKeysViewModelBase with Store {
 
     if (_appStore.wallet!.type == WalletType.bitcoin ||
         _appStore.wallet!.type == WalletType.litecoin ||
+        _appStore.wallet!.type == WalletType.decred ||
         _appStore.wallet!.type == WalletType.bitcoinCash) {
       // final keys = bitcoin!.getWalletKeys(_appStore.wallet!);
 
@@ -330,6 +332,8 @@ abstract class WalletKeysViewModelBase with Store {
         return 'tron-wallet';
       case WalletType.wownero:
         return 'wownero-wallet';
+      case WalletType.decred:
+        return 'decred-wallet';
       default:
         throw Exception('Unexpected wallet type: ${_appStore.wallet!.type.toString()}');
     }

lib/view_model/wallet_new_vm.dart

@@ -69,6 +69,8 @@ abstract class WalletNewVMBase extends WalletCreationVM with Store {
         return seedSettingsViewModel.nanoSeedType == NanoSeedType.bip39
             ? advancedPrivacySettingsViewModel.seedPhraseLength.value
             : 24;
+      case WalletType.decred:
+        return 15;
       default:
         return 24;
     }

lib/view_model/wallet_restore_view_model.dart

@@ -73,6 +73,7 @@ abstract class WalletRestoreViewModelBase extends WalletCreationVM with Store {
   static const moneroSeedMnemonicLength = 25;
   static const electrumSeedMnemonicLength = 24;
   static const electrumShortSeedMnemonicLength = 12;
+  static const decredSeedMnemonicLength = 15;
 
   late List<WalletRestoreMode> availableModes;
   final bool hasSeedLanguageSelector;

tool/configure.dart

@@ -1427,6 +1427,7 @@ import 'package:cw_decred/wallet_service.dart';
 import 'package:cw_decred/wallet_creation_credentials.dart';
 import 'package:cw_decred/amount_format.dart';
 import 'package:cw_decred/transaction_credentials.dart';
+import 'package:cw_decred/mnemonic.dart';
 """;
   const decredCwPart = "part 'cw_decred.dart';";
   const decredContent = """
@@ -1463,6 +1464,8 @@ abstract class Decred {
   void updateUnspents(Object wallet);
 
   int heightByDate(DateTime date);
+
+  List<String> getDecredWordList();
 }
 """;