import 'dart:convert';
// import 'dart:io';
import 'dart:math';

void main() {
//   stdout.write("How strong a password do you want? Weak, Medium or Strong: ");
//   String choice = stdin.readLineSync().toLowerCase();
  String choice = "Weak".toLowerCase();
//   String choice = "Medium".toLowerCase();
//   String choice = "Strong".toLowerCase();

  passwordGenerator(choice);
}

// Create a random sequence of characters
void shuffleGenerator(int strength) {
  final random = Random.secure();
    print('random：\t$random');
  List<int> intList = List.generate(strength, (_) => random.nextInt(255));
    print('intList：\t$intList');
    print('intList Length：\t${intList.length}');
  List charList = base64UrlEncode(intList).split('').toList();
    print('base64UrlEncode(intList)：\t${base64UrlEncode(intList)}');
    print('charList：\t$charList');
    print('charList Length：\t${charList.length}');
  charList.shuffle();
  print("\nYour password is: ${charList.join('')}\n");
}

void passwordGenerator(String strength) {
  if (strength == "weak") {
//     shuffleGenerator(5);
    shuffleGenerator(0);
    shuffleGenerator(1);
    shuffleGenerator(2);
    shuffleGenerator(3);
    shuffleGenerator(4);
    shuffleGenerator(5);
  } else if (strength == "medium") {
    shuffleGenerator(15);
  } else if (strength == "strong") {
    shuffleGenerator(25);
  } else {
    print("Incorrect word is given");
  }
}