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

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

/// Used for [Wallet]-managing operations
class WalletManager {
  /// Returns a list of all [Wallet]s
  static Future<List<Wallet>> listWallets() async {
    final path =
        Directory("${(await getApplicationDocumentsDirectory()).path}/wallets");
    if (!path.existsSync()) {
      path.createSync();
    }
    final wallets = <Wallet>[];
    for (final w
        in path.listSync().map((e) => e.path.split("/").last).toList()) {
      try {
        wallets.add(await loadWallet(w));
      } catch (e) {
        logger.e(e);
        // TODO: do something with unreadable wallets
      }
    }
    logger.i(wallets.length);
    return wallets;
  }

  /// Deletes all [Wallet]s
  static Future<void> deleteAllData() async {
    final path =
        Directory("${(await getApplicationDocumentsDirectory()).path}/wallets");
    if (!path.existsSync()) {
      return;
    }

    for (final entry in path.listSync()) {
      if (!entry.path.endsWith(".json")) return; // only delete wallet files
      logger.d("Deleting ${entry.path}");
      entry.deleteSync();
    }
  }

  /// Loads and returns a single [Wallet] by name
  static Future<Wallet> loadWallet(String name) async {
    final path =
        Directory("${(await getApplicationDocumentsDirectory()).path}/wallets");
    final wallet = File("${path.path}/$name");
    if (!path.existsSync()) {
      path.createSync();
    }
    if (!wallet.existsSync()) {
      return Future.error("Wallet does not exist");
    }
    return Wallet.fromJson(
      jsonDecode(wallet.readAsStringSync()) as Map<String, dynamic>,
    );
  }

  /// Converts [Wallet] to JSON and saves it to AppData
  static Future<bool> saveWallet(Wallet w) async {
    final path =
        Directory("${(await getApplicationDocumentsDirectory()).path}/wallets");
    final wallet = File("${path.path}/${w.name}");
    if (!path.existsSync()) {
      path.createSync();
    }
    // if (!wallet.existsSync()) return false;
    wallet.writeAsStringSync(jsonEncode(w.toJson()));
    return true;
  }

  /// Deletes the corresponding [Wallet] file
  static Future<void> deleteWallet(Wallet w) async {
    final path =
        Directory("${(await getApplicationDocumentsDirectory()).path}/wallets");
    File("${path.path}/${w.name}").deleteSync();
  }
}