implement more namecoin methods

lib/wallets/crypto_currency/coins/namecoin.dart

@@ -19,18 +19,43 @@ class Namecoin extends Bip39HDCurrency {
   }
 
   @override
-  // TODO: implement minConfirms
+  // See https://github.com/cypherstack/stack_wallet/blob/621aff47969761014e0a6c4e699cb637d5687ab3/lib/services/coins/namecoin/namecoin_wallet.dart#L58
-  int get minConfirms => throw UnimplementedError();
+  int get minConfirms => 2;
 
   @override
+  // See https://github.com/cypherstack/stack_wallet/blob/621aff47969761014e0a6c4e699cb637d5687ab3/lib/services/coins/namecoin/namecoin_wallet.dart#L80
   String constructDerivePath({
     required DerivePathType derivePathType,
     int account = 0,
     required int chain,
     required int index,
   }) {
-    // TODO: implement constructDerivePath
+    String coinType;
-    throw UnimplementedError();
+    switch (networkParams.wifPrefix) {
+      case 0xb4: // NMC mainnet wif.
+        coinType = "7"; // NMC mainnet.
+        break;
+      // TODO: [prio=low] Add testnet support.
+      default:
+        throw Exception("Invalid Namecoin network wif used!");
+    }
+
+    int purpose;
+    switch (derivePathType) {
+      case DerivePathType.bip44:
+        purpose = 44;
+        break;
+      case DerivePathType.bip49:
+        purpose = 49;
+        break;
+      case DerivePathType.bip84:
+        purpose = 84;
+        break;
+      default:
+        throw Exception("DerivePathType $derivePathType not supported");
+    }
+
+    return "m/$purpose'/$coinType'/$account'/$chain/$index";
   }
 
   @override
@@ -48,40 +73,97 @@ class Namecoin extends Bip39HDCurrency {
           isFailover: true,
           isDown: false,
         );
-
+      // case CryptoCurrencyNetwork.test:
+      // TODO: [prio=low] Add testnet support.
       default:
         throw UnimplementedError();
     }
   }
 
   @override
-  // TODO: implement dustLimit
+  // See https://github.com/cypherstack/stack_wallet/blob/621aff47969761014e0a6c4e699cb637d5687ab3/lib/services/coins/namecoin/namecoin_wallet.dart#L60
-  Amount get dustLimit => throw UnimplementedError();
+  Amount get dustLimit =>
+      Amount(rawValue: BigInt.from(546), fractionDigits: Coin.particl.decimals);
 
   @override
-  // TODO: implement genesisHash
+  // See https://github.com/cypherstack/stack_wallet/blob/621aff47969761014e0a6c4e699cb637d5687ab3/lib/services/coins/namecoin/namecoin_wallet.dart#L6
-  String get genesisHash => throw UnimplementedError();
+  String get genesisHash {
+    switch (network) {
+      case CryptoCurrencyNetwork.main:
+        return "000000000062b72c5e2ceb45fbc8587e807c155b0da735e6483dfba2f0a9c770";
+      case CryptoCurrencyNetwork.test:
+        return "00000007199508e34a9ff81e6ec0c477a4cccff2a4767a8eee39c11db367b008";
+      default:
+        throw Exception("Unsupported network: $network");
+    }
+  }
 
   @override
   ({coinlib.Address address, AddressType addressType}) getAddressForPublicKey(
       {required coinlib.ECPublicKey publicKey,
       required DerivePathType derivePathType}) {
-    // TODO: implement getAddressForPublicKey
+    switch (derivePathType) {
-    throw UnimplementedError();
+      // case DerivePathType.bip16: // TODO: [prio=low] Add P2SH support.
+
+      case DerivePathType.bip44:
+        final addr = coinlib.P2PKHAddress.fromPublicKey(
+          publicKey,
+          version: networkParams.p2pkhPrefix,
+        );
+
+        return (address: addr, addressType: AddressType.p2pkh);
+
+      // case DerivePathType.bip49:
+
+      case DerivePathType.bip84:
+        final addr = coinlib.P2WPKHAddress.fromPublicKey(
+          publicKey,
+          hrp: networkParams.bech32Hrp,
+        );
+
+        return (address: addr, addressType: AddressType.p2wpkh);
+
+      default:
+        throw Exception("DerivePathType $derivePathType not supported");
+    }
   }
 
   @override
-  // TODO: implement networkParams
+  // See https://github.com/cypherstack/stack_wallet/blob/621aff47969761014e0a6c4e699cb637d5687ab3/lib/services/coins/namecoin/namecoin_wallet.dart#L3474
-  coinlib.NetworkParams get networkParams => throw UnimplementedError();
+  coinlib.NetworkParams get networkParams {
+    switch (network) {
+      case CryptoCurrencyNetwork.main:
+        return const coinlib.NetworkParams(
+          wifPrefix: 0xb4, // From 180.
+          p2pkhPrefix: 0x34, // From 52.
+          p2shPrefix: 0x0d, // From 13.
+          privHDPrefix: 0x0488ade4,
+          pubHDPrefix: 0x0488b21e,
+          bech32Hrp: "nc",
+          messagePrefix: '\x18Namecoin Signed Message:\n',
+        );
+      // case CryptoCurrencyNetwork.test:
+      // TODO: [prio=low] Add testnet support.
+      default:
+        throw Exception("Unsupported network: $network");
+    }
+  }
 
   @override
-  // TODO: implement supportedDerivationPathTypes
+  List<DerivePathType> get supportedDerivationPathTypes => [
-  List<DerivePathType> get supportedDerivationPathTypes =>
+        // DerivePathType.bip16, // TODO: [prio=low] Add P2SH support.
-      throw UnimplementedError();
+        DerivePathType.bip44,
+        // DerivePathType.bip49,
+        DerivePathType.bip84,
+      ];
 
   @override
   bool validateAddress(String address) {
-    // TODO: implement validateAddress
+    try {
-    throw UnimplementedError();
+      coinlib.Address.fromString(address, networkParams);
+      return true;
+    } catch (_) {
+      return false;
+    }
   }
 }

lib/wallets/wallet/impl/namecoin_wallet.dart

@@ -6,6 +6,7 @@ import 'package:stackwallet/wallets/crypto_currency/crypto_currency.dart';
 import 'package:stackwallet/wallets/wallet/intermediate/bip39_hd_wallet.dart';
 import 'package:stackwallet/wallets/wallet/wallet_mixin_interfaces/coin_control_interface.dart';
 import 'package:stackwallet/wallets/wallet/wallet_mixin_interfaces/electrumx_interface.dart';
+import 'package:tuple/tuple.dart';
 
 class NamecoinWallet extends Bip39HDWallet
     with ElectrumXInterface, CoinControlInterface {
@@ -46,9 +47,9 @@ class NamecoinWallet extends Bip39HDWallet
   @override
   Future<({bool blocked, String? blockedReason, String? utxoLabel})>
       checkBlockUTXO(Map<String, dynamic> jsonUTXO, String? scriptPubKeyHex,
-          Map<String, dynamic> jsonTX, String? utxoOwnerAddress) {
+          Map<String, dynamic> jsonTX, String? utxoOwnerAddress) async {
-    // TODO: implement checkBlockUTXO
+    // Namecoin doesn't have special outputs like tokens, ordinals, etc.
-    throw UnimplementedError();
+    return (blocked: false, blockedReason: null, utxoLabel: null);
   }
 
   @override
@@ -56,7 +57,7 @@ class NamecoinWallet extends Bip39HDWallet
     return vSize * (feeRatePerKB / 1000).ceil();
   }
 
-  // TODO: [prio=low] Check if this is the correct formula for namecoin. ECF
+  // TODO: Check if this is the correct formula for namecoin.
   @override
   Amount roughFeeEstimate(int inputCount, int outputCount, int feeRatePerKB) {
     return Amount(
@@ -68,8 +69,23 @@ class NamecoinWallet extends Bip39HDWallet
   }
 
   @override
-  Future<void> updateTransactions() {
+  Future<void> updateTransactions() async {
-    // TODO: implement updateTransactions
+    final currentChainHeight = await fetchChainHeight();
-    throw UnimplementedError();
+
+    // TODO: [prio=a] switch to V2 transactions
+    final data = await fetchTransactionsV1(
+      addresses: await fetchAddressesForElectrumXScan(),
+      currentChainHeight: currentChainHeight,
+    );
+
+    await mainDB.addNewTransactionData(
+      data
+          .map((e) => Tuple2(
+                e.transaction,
+                e.address,
+              ))
+          .toList(),
+      walletId,
+    );
   }
 }