cake_wallet/cw_ethereum/lib/ethereum_wallet_service.dart

import 'package:cw_core/wallet_base.dart';
import 'package:cw_core/wallet_type.dart';
import 'package:cw_ethereum/ethereum_client.dart';
import 'package:cw_ethereum/ethereum_mnemonics_exception.dart';
import 'package:cw_ethereum/ethereum_wallet.dart';
import 'package:cw_evm/evm_chain_wallet_creation_credentials.dart';
import 'package:cw_evm/evm_chain_wallet_service.dart';
import 'package:bip39/bip39.dart' as bip39;

class EthereumWalletService extends EVMChainWalletService<EthereumWallet> {
  EthereumWalletService(super.walletInfoSource, {required this.client});

  late EthereumClient client;

  @override
  WalletType getType() => WalletType.ethereum;

  @override
  Future<EthereumWallet> create(EVMChainNewWalletCredentials credentials) async {
    final strength = credentials.seedPhraseLength == 24 ? 256 : 128;

    final mnemonic = bip39.generateMnemonic(strength: strength);

    final wallet = EthereumWallet(
      walletInfo: credentials.walletInfo!,
      mnemonic: mnemonic,
      password: credentials.password!,
      client: client,
    );

    await wallet.init();
    wallet.addInitialTokens();
    await wallet.save();

    return wallet;
  }

  @override
  Future<EthereumWallet> openWallet(String name, String password) async {
    final walletInfo =
        walletInfoSource.values.firstWhere((info) => info.id == WalletBase.idFor(name, getType()));

    try {
      final wallet = await EthereumWallet.open(
        name: name,
        password: password,
        walletInfo: walletInfo,
      );

      await wallet.init();
      await wallet.save();
      saveBackup(name);
      return wallet;
    } catch (_) {
      
      await restoreWalletFilesFromBackup(name);

      final wallet = await EthereumWallet.open(
        name: name,
        password: password,
        walletInfo: walletInfo,
      );
      await wallet.init();
      await wallet.save();
      return wallet;
    }
  }

  @override
  Future<void> rename(String currentName, String password, String newName) async {
    final currentWalletInfo = walletInfoSource.values
        .firstWhere((info) => info.id == WalletBase.idFor(currentName, getType()));
    final currentWallet = await EthereumWallet.open(
        password: password, name: currentName, walletInfo: currentWalletInfo);

    await currentWallet.renameWalletFiles(newName);
    await saveBackup(newName);

    final newWalletInfo = currentWalletInfo;
    newWalletInfo.id = WalletBase.idFor(newName, getType());
    newWalletInfo.name = newName;

    await walletInfoSource.put(currentWalletInfo.key, newWalletInfo);
  }

  @override
  Future<EthereumWallet> restoreFromKeys(EVMChainRestoreWalletFromPrivateKey credentials) async {
    final wallet = EthereumWallet(
      password: credentials.password!,
      privateKey: credentials.privateKey,
      walletInfo: credentials.walletInfo!,
      client: client,
    );

    await wallet.init();
    wallet.addInitialTokens();
    await wallet.save();

    return wallet;
  }

  @override
  Future<EthereumWallet> restoreFromSeed(
      EVMChainRestoreWalletFromSeedCredentials credentials) async {
    if (!bip39.validateMnemonic(credentials.mnemonic)) {
      throw EthereumMnemonicIsIncorrectException();
    }

    final wallet = EthereumWallet(
      password: credentials.password!,
      mnemonic: credentials.mnemonic,
      walletInfo: credentials.walletInfo!,
      client: client,
    );

    await wallet.init();
    wallet.addInitialTokens();
    await wallet.save();

    return wallet;
  }
}