'use strict';

var Options = require('./Options.js');

const SECOND = 1;
const MINUTE = SECOND * 60;
const HOUR = MINUTE * 60;
const DAY = HOUR * 24;
const MONTH = DAY * 31;
const YEAR = MONTH * 12;
const CENTURY = YEAR * 100;
const times = {
  second: SECOND,
  minute: MINUTE,
  hour: HOUR,
  day: DAY,
  month: MONTH,
  year: YEAR,
  century: CENTURY
};
/*
 * -------------------------------------------------------------------------------
 *  Estimates time for an attacker ---------------------------------------------------------------
 * -------------------------------------------------------------------------------
 */
class TimeEstimates {
  translate(displayStr, value) {
    let key = displayStr;
    if (value !== undefined && value !== 1) {
      key += 's';
    }
    const {
      timeEstimation
    } = Options.default.translations;
    return timeEstimation[key].replace('{base}', `${value}`);
  }
  estimateAttackTimes(guesses) {
    const crackTimesSeconds = {
      onlineThrottling100PerHour: guesses / (100 / 3600),
      onlineNoThrottling10PerSecond: guesses / 10,
      offlineSlowHashing1e4PerSecond: guesses / 1e4,
      offlineFastHashing1e10PerSecond: guesses / 1e10
    };
    const crackTimesDisplay = {
      onlineThrottling100PerHour: '',
      onlineNoThrottling10PerSecond: '',
      offlineSlowHashing1e4PerSecond: '',
      offlineFastHashing1e10PerSecond: ''
    };
    Object.keys(crackTimesSeconds).forEach(scenario => {
      const seconds = crackTimesSeconds[scenario];
      crackTimesDisplay[scenario] = this.displayTime(seconds);
    });
    return {
      crackTimesSeconds,
      crackTimesDisplay,
      score: this.guessesToScore(guesses)
    };
  }
  guessesToScore(guesses) {
    const DELTA = 5;
    if (guesses < 1e3 + DELTA) {
      // risky password: "too guessable"
      return 0;
    }
    if (guesses < 1e6 + DELTA) {
      // modest protection from throttled online attacks: "very guessable"
      return 1;
    }
    if (guesses < 1e8 + DELTA) {
      // modest protection from unthrottled online attacks: "somewhat guessable"
      return 2;
    }
    if (guesses < 1e10 + DELTA) {
      // modest protection from offline attacks: "safely unguessable"
      // assuming a salted, slow hash function like bcrypt, scrypt, PBKDF2, argon, etc
      return 3;
    }
    // strong protection from offline attacks under same scenario: "very unguessable"
    return 4;
  }
  displayTime(seconds) {
    let displayStr = 'centuries';
    let base;
    const timeKeys = Object.keys(times);
    const foundIndex = timeKeys.findIndex(time => seconds < times[time]);
    if (foundIndex > -1) {
      displayStr = timeKeys[foundIndex - 1];
      if (foundIndex !== 0) {
        base = Math.round(seconds / times[displayStr]);
      } else {
        displayStr = 'ltSecond';
      }
    }
    return this.translate(displayStr, base);
  }
}

module.exports = TimeEstimates;
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