stack_wallet/lib/wallets/wallet/impl/dash_wallet.dart

import 'package:isar/isar.dart';

import '../../../models/isar/models/blockchain_data/address.dart';
import '../../../models/isar/models/blockchain_data/transaction.dart';
import '../../../models/isar/models/blockchain_data/v2/input_v2.dart';
import '../../../models/isar/models/blockchain_data/v2/output_v2.dart';
import '../../../models/isar/models/blockchain_data/v2/transaction_v2.dart';
import '../../../utilities/amount/amount.dart';
import '../../../utilities/logger.dart';
import '../../crypto_currency/crypto_currency.dart';
import '../../crypto_currency/interfaces/electrumx_currency_interface.dart';
import '../intermediate/bip39_hd_wallet.dart';
import '../wallet_mixin_interfaces/coin_control_interface.dart';
import '../wallet_mixin_interfaces/electrumx_interface.dart';

class DashWallet<T extends ElectrumXCurrencyInterface> extends Bip39HDWallet<T>
    with ElectrumXInterface<T>, CoinControlInterface {
  DashWallet(CryptoCurrencyNetwork network) : super(Dash(network) as T);

  @override
  int get maximumFeerate => 2500;

  @override
  int get isarTransactionVersion => 2;

  @override
  FilterOperation? get changeAddressFilterOperation =>
      FilterGroup.and(standardChangeAddressFilters);

  @override
  FilterOperation? get receivingAddressFilterOperation =>
      FilterGroup.and(standardReceivingAddressFilters);

  // ===========================================================================

  @override
  Future<List<Address>> fetchAddressesForElectrumXScan() async {
    final allAddresses = await mainDB
        .getAddresses(walletId)
        .filter()
        .not()
        .group(
          (q) => q
              .typeEqualTo(AddressType.nonWallet)
              .or()
              .subTypeEqualTo(AddressSubType.nonWallet),
        )
        .findAll();
    return allAddresses;
  }

  // ===========================================================================

  @override
  Future<void> updateTransactions() async {
    // Get all addresses.
    final List<Address> allAddressesOld =
        await fetchAddressesForElectrumXScan();

    // Separate receiving and change addresses.
    final Set<String> receivingAddresses = allAddressesOld
        .where((e) => e.subType == AddressSubType.receiving)
        .map((e) => e.value)
        .toSet();
    final Set<String> changeAddresses = allAddressesOld
        .where((e) => e.subType == AddressSubType.change)
        .map((e) => e.value)
        .toSet();

    // Remove duplicates.
    final allAddressesSet = {...receivingAddresses, ...changeAddresses};

    // Fetch history from ElectrumX.
    final List<Map<String, dynamic>> allTxHashes =
        await fetchHistory(allAddressesSet);

    // Only parse new txs (not in db yet).
    final List<Map<String, dynamic>> allTransactions = [];
    for (final txHash in allTxHashes) {
      // Check for duplicates by searching for tx by tx_hash in db.
      final storedTx = await mainDB.isar.transactionV2s
          .where()
          .txidWalletIdEqualTo(txHash["tx_hash"] as String, walletId)
          .findFirst();

      if (storedTx == null ||
          storedTx.height == null ||
          (storedTx.height != null && storedTx.height! <= 0)) {
        // Tx not in db yet.
        final tx = await electrumXCachedClient.getTransaction(
          txHash: txHash["tx_hash"] as String,
          verbose: true,
          cryptoCurrency: cryptoCurrency,
        );

        // Only tx to list once.
        if (allTransactions
                .indexWhere((e) => e["txid"] == tx["txid"] as String) ==
            -1) {
          tx["height"] = txHash["height"];
          allTransactions.add(tx);
        }
      }
    }

    // Parse all new txs.
    final List<TransactionV2> txns = [];
    for (final txData in allTransactions) {
      bool wasSentFromThisWallet = false;
      // Set to true if any inputs were detected as owned by this wallet.

      bool wasReceivedInThisWallet = false;
      // Set to true if any outputs were detected as owned by this wallet.

      // Parse inputs.
      BigInt amountReceivedInThisWallet = BigInt.zero;
      BigInt changeAmountReceivedInThisWallet = BigInt.zero;
      final List<InputV2> inputs = [];
      for (final jsonInput in txData["vin"] as List) {
        final map = Map<String, dynamic>.from(jsonInput as Map);

        final List<String> addresses = [];
        String valueStringSats = "0";
        OutpointV2? outpoint;

        final coinbase = map["coinbase"] as String?;

        if (coinbase == null) {
          // Not a coinbase (ie a typical input).
          final txid = map["txid"] as String;
          final vout = map["vout"] as int;

          final inputTx = await electrumXCachedClient.getTransaction(
            txHash: txid,
            cryptoCurrency: cryptoCurrency,
          );

          final prevOutJson = Map<String, dynamic>.from(
            (inputTx["vout"] as List).firstWhere((e) => e["n"] == vout) as Map,
          );

          final prevOut = OutputV2.fromElectrumXJson(
            prevOutJson,
            decimalPlaces: cryptoCurrency.fractionDigits,
            isFullAmountNotSats: true,
            walletOwns: false, // Doesn't matter here as this is not saved.
          );

          outpoint = OutpointV2.isarCantDoRequiredInDefaultConstructor(
            txid: txid,
            vout: vout,
          );
          valueStringSats = prevOut.valueStringSats;
          addresses.addAll(prevOut.addresses);
        }

        InputV2 input = InputV2.isarCantDoRequiredInDefaultConstructor(
          scriptSigHex: map["scriptSig"]?["hex"] as String?,
          scriptSigAsm: map["scriptSig"]?["asm"] as String?,
          sequence: map["sequence"] as int?,
          outpoint: outpoint,
          valueStringSats: valueStringSats,
          addresses: addresses,
          witness: map["witness"] as String?,
          coinbase: coinbase,
          innerRedeemScriptAsm: map["innerRedeemscriptAsm"] as String?,
          // Need addresses before we can know if the wallet owns this input.
          walletOwns: false,
        );

        // Check if input was from this wallet.
        if (allAddressesSet.intersection(input.addresses.toSet()).isNotEmpty) {
          wasSentFromThisWallet = true;
          input = input.copyWith(walletOwns: true);
        }

        inputs.add(input);
      }

      // Parse outputs.
      final List<OutputV2> outputs = [];
      for (final outputJson in txData["vout"] as List) {
        OutputV2 output = OutputV2.fromElectrumXJson(
          Map<String, dynamic>.from(outputJson as Map),
          decimalPlaces: cryptoCurrency.fractionDigits,
          isFullAmountNotSats: true,
          // Need addresses before we can know if the wallet owns this input.
          walletOwns: false,
        );

        // If output was to my wallet, add value to amount received.
        if (receivingAddresses
            .intersection(output.addresses.toSet())
            .isNotEmpty) {
          wasReceivedInThisWallet = true;
          amountReceivedInThisWallet += output.value;
          output = output.copyWith(walletOwns: true);
        } else if (changeAddresses
            .intersection(output.addresses.toSet())
            .isNotEmpty) {
          wasReceivedInThisWallet = true;
          changeAmountReceivedInThisWallet += output.value;
          output = output.copyWith(walletOwns: true);
        }

        outputs.add(output);
      }

      final totalOut = outputs
          .map((e) => e.value)
          .fold(BigInt.zero, (value, element) => value + element);

      TransactionType type;
      final TransactionSubType subType = TransactionSubType.none;

      // At least one input was owned by this wallet.
      if (wasSentFromThisWallet) {
        type = TransactionType.outgoing;

        if (wasReceivedInThisWallet) {
          if (changeAmountReceivedInThisWallet + amountReceivedInThisWallet ==
              totalOut) {
            // Definitely sent all to self.
            type = TransactionType.sentToSelf;
          } else if (amountReceivedInThisWallet == BigInt.zero) {
            // Most likely just a typical send, do nothing here yet.
          }

          // This is where we would check for them.
          // TODO: [prio=high] Check for special Dash outputs.
        }
      } else if (wasReceivedInThisWallet) {
        // Only found outputs owned by this wallet.
        type = TransactionType.incoming;
      } else {
        Logging.instance.log(
          "Unexpected tx found (ignoring it): $txData",
          level: LogLevel.Error,
        );
        continue;
      }

      final tx = TransactionV2(
        walletId: walletId,
        blockHash: txData["blockhash"] as String?,
        hash: txData["txid"] as String,
        txid: txData["txid"] as String,
        height: txData["height"] as int?,
        version: txData["version"] as int,
        timestamp: txData["blocktime"] as int? ??
            DateTime.timestamp().millisecondsSinceEpoch ~/ 1000,
        inputs: List.unmodifiable(inputs),
        outputs: List.unmodifiable(outputs),
        type: type,
        subType: subType,
        otherData: null,
      );

      txns.add(tx);
    }

    await mainDB.updateOrPutTransactionV2s(txns);
  }

  @override
  Future<({String? blockedReason, bool blocked, String? utxoLabel})>
      checkBlockUTXO(
    Map<String, dynamic> jsonUTXO,
    String? scriptPubKeyHex,
    Map<String, dynamic> jsonTX,
    String? utxoOwnerAddress,
  ) async {
    bool blocked = false;
    String? blockedReason;

    // // check for bip47 notification
    // final outputs = jsonTX["vout"] as List;
    // for (final output in outputs) {
    //   final List<String>? scriptChunks =
    //   (output['scriptPubKey']?['asm'] as String?)?.split(" ");
    //   if (scriptChunks?.length == 2 && scriptChunks?[0] == "OP_RETURN") {
    //     final blindedPaymentCode = scriptChunks![1];
    //     final bytes = blindedPaymentCode.toUint8ListFromHex;
    //
    //     // https://en.bitcoin.it/wiki/BIP_0047#Sending
    //     if (bytes.length == 80 && bytes.first == 1) {
    //       blocked = true;
    //       blockedReason = "Paynym notification output. Incautious "
    //           "handling of outputs from notification transactions "
    //           "may cause unintended loss of privacy.";
    //       break;
    //     }
    //   }
    // }

    return (blockedReason: blockedReason, blocked: blocked, utxoLabel: null);
  }

  @override
  Amount roughFeeEstimate(int inputCount, int outputCount, int feeRatePerKB) {
    return Amount(
      rawValue: BigInt.from(
        ((181 * inputCount) + (34 * outputCount) + 10) *
            (feeRatePerKB / 1000).ceil(),
      ),
      fractionDigits: cryptoCurrency.fractionDigits,
    );
  }

  @override
  int estimateTxFee({required int vSize, required int feeRatePerKB}) {
    return vSize * (feeRatePerKB / 1000).ceil();
  }
}