scheduler-back/src/util/generator.ts

export class Generator {
  static getVerificationCode() {
    return Math.random().toString().slice(2, 8);
  }

  private static getRandomCharacter(string: string) {
    return string[Math.floor(Math.random() * string.length)];
  }

  private static getShuffledString(string: string) {
    let arr = string.split('');
    
    for (let i = arr.length - 1; i > 0; i--) {
      const j = Math.floor(Math.random() * (i + 1));
      [arr[i], arr[j]] = [arr[j], arr[i]];
    }

    return arr.join('');
  }
  
  static getResetPasswordCode() {
    const alphabets = 'abcdefghijklmnopqrstuvwxyz';
    const numbers = '0123456789';
    const specials = '!@#$%^';
    const all = alphabets + numbers + specials;

    let resetPasswordCode = Generator.getRandomCharacter(alphabets);
    let requiredNumber = Generator.getRandomCharacter(numbers);
    let requiredSpecial = Generator.getRandomCharacter(specials);

    let shuffledRestPart = Generator.getShuffledString(all).slice(0, 5);

    let shuffledRestCode = Generator.getShuffledString(requiredNumber + requiredSpecial + shuffledRestPart);

    return resetPasswordCode + shuffledRestCode;
  }
}