cake_wallet/cw_bitcoin/lib/electrum_wallet_snapshot.dart

import 'dart:convert';
import 'package:bitcoin_base/bitcoin_base.dart';
import 'package:cw_bitcoin/bitcoin_address_record.dart';
import 'package:cw_bitcoin/electrum_balance.dart';
import 'package:cw_core/pathForWallet.dart';
import 'package:cw_core/wallet_info.dart';
import 'package:cw_core/utils/file.dart';
import 'package:cw_core/wallet_type.dart';

class ElectrumWalletSnapshot {
  ElectrumWalletSnapshot({
    required this.name,
    required this.type,
    required this.password,
    required this.mnemonic,
    required this.xpub,
    required this.addresses,
    required this.balance,
    required this.regularAddressIndex,
    required this.changeAddressIndex,
    required this.addressPageType,
    this.passphrase,
    this.derivationType,
    this.derivationPath,
  });

  final String name;
  final String password;
  final WalletType type;
  final String? addressPageType;

  String? mnemonic;
  String? xpub;
  List<BitcoinAddressRecord> addresses;
  ElectrumBalance balance;
  Map<String, int> regularAddressIndex;
  Map<String, int> changeAddressIndex;
  String? passphrase;
  DerivationType? derivationType;
  String? derivationPath;

  static Future<ElectrumWalletSnapshot> load(
      String name, WalletType type, String password, BasedUtxoNetwork network) async {
    final path = await pathForWallet(name: name, type: type);
    final jsonSource = await read(path: path, password: password);
    final data = json.decode(jsonSource) as Map;
    final addressesTmp = data['addresses'] as List? ?? <Object>[];
    final mnemonic = data['mnemonic'] as String?;
    final xpub = data['xpub'] as String?;
    final passphrase = data['passphrase'] as String? ?? '';
    final addresses = addressesTmp
        .whereType<String>()
        .map((addr) => BitcoinAddressRecord.fromJSON(addr, network))
        .toList();
    final balance = ElectrumBalance.fromJSON(data['balance'] as String) ??
        ElectrumBalance(confirmed: 0, unconfirmed: 0, frozen: 0);
    var regularAddressIndexByType = {SegwitAddresType.p2wpkh.toString(): 0};
    var changeAddressIndexByType = {SegwitAddresType.p2wpkh.toString(): 0};

    final derivationType =
        DerivationType.values[(data['derivationTypeIndex'] as int?) ?? DerivationType.electrum.index];
    final derivationPath = data['derivationPath'] as String? ?? "m/0'/0";

    try {
      regularAddressIndexByType = {
        SegwitAddresType.p2wpkh.toString(): int.parse(data['account_index'] as String? ?? '0')
      };
      changeAddressIndexByType = {
        SegwitAddresType.p2wpkh.toString():
            int.parse(data['change_address_index'] as String? ?? '0')
      };
    } catch (_) {
      try {
        regularAddressIndexByType = data["account_index"] as Map<String, int>? ?? {};
        changeAddressIndexByType = data["change_address_index"] as Map<String, int>? ?? {};
      } catch (_) {}
    }

    return ElectrumWalletSnapshot(
      name: name,
      type: type,
      password: password,
      passphrase: passphrase,
      mnemonic: mnemonic,
      xpub: xpub,
      addresses: addresses,
      balance: balance,
      regularAddressIndex: regularAddressIndexByType,
      changeAddressIndex: changeAddressIndexByType,
      addressPageType: data['address_page_type'] as String?,
      derivationType: derivationType,
      derivationPath: derivationPath,
    );
  }
}