import * as crypto from 'crypto';

const ERRORS = {
  TYPE: 'Password must be a string',
  LENGTH: 'Password must be between 6 and 64 characters long',
  CHARACTER: 'Password must only contain letters, numbers and symbols',
};

const sha512 = (text: string) => {
  const hash = crypto.createHash('sha512');
  hash.update(text.trim());
  return hash.digest('hex');
};

export const MAX_PASSWORD_LENGTH = 64;

export const generateHash = (phrase: string) => phrase && sha512(phrase.trim());
export const matchesHash = (phrase: string | null, hash: string) =>
  phrase && sha512(phrase.trim()) === hash.trim();

export const validatePassword = (phrase: string) => {
  if (typeof phrase !== 'string') {
    return window?.i18n ? window?.i18n('passwordTypeError') : ERRORS.TYPE;
  }

  const trimmed = phrase.trim();
  if (trimmed.length === 0) {
    return window?.i18n ? window?.i18n('noGivenPassword') : ERRORS.LENGTH;
  }

  if (trimmed.length < 6 || trimmed.length > MAX_PASSWORD_LENGTH) {
    return window?.i18n ? window?.i18n('passwordLengthError') : ERRORS.LENGTH;
  }

  // Restrict characters to letters, numbers and symbols
  const characterRegex = /^[a-zA-Z0-9-!?/\\()._`~@#$%^&*+=[\]{}|<>,;: ]+$/;
  if (!characterRegex.test(trimmed)) {
    return window?.i18n ? window?.i18n('passwordCharacterError') : ERRORS.CHARACTER;
  }

  return null;
};