prasule/lib/api/walletmanager.dart

import 'dart:convert';
import 'dart:io';

import 'package:path_provider/path_provider.dart';
import 'package:prasule/api/wallet.dart';

class WalletManager {
  static Future<List<Wallet>> listWallets() async {
    var path =
        Directory("${(await getApplicationDocumentsDirectory()).path}/wallets");
    if (!path.existsSync()) {
      path.createSync();
    }
    var wallets = <Wallet>[];
    for (var w in path.listSync().map((e) => e.path.split("/").last).toList()) {
      wallets.add(await loadWallet(w));
    }
    return wallets;
  }

  static Future<Wallet> loadWallet(String name) async {
    var path =
        Directory("${(await getApplicationDocumentsDirectory()).path}/wallets");
    var wallet = File("${path.path}/$name");
    if (!path.existsSync()) {
      path.createSync();
    }
    if (!wallet.existsSync()) {
      return Future.error("Wallet does not exist");
    }
    return Wallet.fromJson(jsonDecode(wallet.readAsStringSync()));
  }

  static Future<bool> saveWallet(Wallet w) async {
    var path =
        Directory("${(await getApplicationDocumentsDirectory()).path}/wallets");
    var wallet = File("${path.path}/${w.name}");
    if (!path.existsSync()) {
      path.createSync();
    }
    if (wallet.existsSync()) return false;
    wallet.writeAsStringSync(jsonEncode(w.toJson()));
    return true;
  }

  static Future<void> deleteWallet(Wallet w) async {
    var path =
        Directory("${(await getApplicationDocumentsDirectory()).path}/wallets");
    var wallet = File("${path.path}/${w.name}");
    wallet.deleteSync();
  }
}