const defaultOptions = [
  {
    id: 0,
    value: "Too weak",
    minDiversity: 0,
    minLength: 0
  },
  {
    id: 1,
    value: "Weak",
    minDiversity: 2,
    minLength: 6
  },
  {
    id: 2,
    value: "Medium",
    minDiversity: 4,
    minLength: 8
  },
  {
    id: 3,
    value: "Strong",
    minDiversity: 4,
    minLength: 10
  }
];

const passwordStrength = (password, options = defaultOptions, allowedSymbols="!\"#\$%&'\(\)\*\+,-\./:;<=>\?@\[\\\\\\]\^_`\{|\}~") => {
  
  let passwordCopy = password || '';

  options[0].minDiversity = 0,
  options[0].minLength = 0;

  const rules = [
    {
      regex: "[a-z]",
      message: 'lowercase'
    },
    {
      regex: '[A-Z]',
      message: 'uppercase'
    },
    {
      regex: '[0-9]',
      message: 'number'
    },
  ];

  if (allowedSymbols) {
    rules.push({
      regex: `[${allowedSymbols}]`,
      message: 'symbol'
    });
  }

  let strength = {};

  strength.contains = rules
    .filter(rule => new RegExp(`${rule.regex}`).test(passwordCopy))
    .map(rule => rule.message);

  strength.length = passwordCopy.length;

  let fulfilledOptions = options
    .filter(option => strength.contains.length >= option.minDiversity)
    .filter(option => strength.length >= option.minLength)
    .sort((o1, o2) => o2.id - o1.id)
    .map(option => ({id: option.id, value: option.value}));

  Object.assign(strength, fulfilledOptions[0]);

  return strength;
};

module.exports = { passwordStrength, defaultOptions };
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