var chai = require('chai');
var expect = chai.expect;

var timestring = require('./index');

describe('timestring', function() {
  it('can parse a timestring', function() {
    expect(timestring('500ms')).to.equal(0.5);
    expect(timestring('1s')).to.equal(1);
    expect(timestring('1m')).to.equal(60);
    expect(timestring('1h')).to.equal(3600);
    expect(timestring('1d')).to.equal(86400);
    expect(timestring('1w')).to.equal(604800);
    expect(timestring('1mth')).to.equal(2419200);
    expect(timestring('1y')).to.equal(29030400);
  });

  it('can parse different unit identifiers', function() {
    var unitMap = {
      ms: ['ms', 'milli', 'millisecond', 'milliseconds'],
      s: ['s', 'sec', 'secs', 'second', 'seconds'],
      m: ['m', 'min', 'mins', 'minute', 'minutes'],
      h: ['h', 'hr', 'hrs', 'hour', 'hours'],
      d: ['d', 'day', 'days'],
      w: ['w', 'week', 'weeks'],
      mth: ['mon', 'mth', 'mths','month', 'months'],
      y: ['y', 'yr', 'yrs', 'year', 'years'],
    };

    unitMap.ms.forEach(function(msUnit) {
      expect(timestring('500 ' + msUnit)).to.equal(0.5);
    });

    unitMap.s.forEach(function(sUnit) {
      expect(timestring('3 ' + sUnit)).to.equal(3);
    });

    unitMap.m.forEach(function(mUnit) {
      expect(timestring('2 ' + mUnit)).to.equal(120);
    });

    unitMap.h.forEach(function(hUnit) {
      expect(timestring('7 ' + hUnit)).to.equal(25200);
    });

    unitMap.d.forEach(function(dUnit) {
      expect(timestring('4 ' + dUnit)).to.equal(345600);
    });

    unitMap.w.forEach(function(wUnit) {
      expect(timestring('2 ' + wUnit)).to.equal(1209600);
    });

    unitMap.mth.forEach(function(mthUnit) {
      expect(timestring('9 ' + mthUnit)).to.equal(21772800);
    });

    unitMap.y.forEach(function(yUnit) {
      expect(timestring('1 ' + yUnit)).to.equal(29030400);
    });
  });

  it('can return a value in a specified unit', function() {
    expect(timestring('1m', 'ms')).to.equal(60000);
    expect(timestring('5m', 's')).to.equal(300);
    expect(timestring('5m', 'm')).to.equal(5);
  });

  it('uses the passed options instead of the defaults', function() {
    var opts = {
      hoursPerDay: 1,
      daysPerWeek: 2,
      weeksPerMonth: 3,
      monthsPerYear: 4
    };

    expect(timestring('1d', 'h', opts)).to.equal(1);
    expect(timestring('1w', 'd', opts)).to.equal(2);
    expect(timestring('1mth', 'w', opts)).to.equal(3);
    expect(timestring('1y', 'mth', opts)).to.equal(4);
  });

  it('throws an error when an invalid unit is used in the timestring', function() {
    expect(function() { timestring('1g'); }).to.throw(Error);
  });

  it('can parse a messy time string', function() {
    expect(timestring('5   D a YS    4 h   2 0     mI  nS')).to.equal(447600);
  });
});