define([
  'app/core/utils/kbn',
  'app/core/utils/datemath'
], function(kbn, dateMath) {
  'use strict';

  describe('unit format menu', function() {
    var menu = kbn.getUnitFormats();
    menu.map(function(submenu) {
      describe('submenu ' + submenu.text, function() {
        it('should have a title', function() { expect(submenu.text).to.be.a('string'); });
        it('should have a submenu', function() { expect(submenu.submenu).to.be.an('array'); });
        submenu.submenu.map(function(entry) {
          describe('entry ' + entry.text, function() {
            it('should have a title', function() { expect(entry.text).to.be.a('string'); });
            it('should have a format', function() { expect(entry.value).to.be.a('string'); });
            it('should have a valid format', function() {
              expect(kbn.valueFormats[entry.value]).to.be.a('function');
            });
          });
        });
      });
    });
  });

  function describeValueFormat(desc, value, tickSize, tickDecimals, result) {

    describe('value format: ' + desc, function() {
      it('should translate ' + value + ' as ' + result, function() {
        var scaledDecimals = tickDecimals - Math.floor(Math.log(tickSize) / Math.LN10);
        var str = kbn.valueFormats[desc](value, tickDecimals, scaledDecimals);
        expect(str).to.be(result);
      });
    });

  }

  describeValueFormat('ms', 0.0024, 0.0005, 4, '0.0024 ms');
  describeValueFormat('ms', 100, 1, 0, '100 ms');
  describeValueFormat('ms', 1250, 10, 0, '1.25 s');
  describeValueFormat('ms', 1250, 300, 0, '1.3 s');
  describeValueFormat('ms', 65150, 10000, 0, '1.1 min');
  describeValueFormat('ms', 6515000, 1500000, 0, '1.8 hour');
  describeValueFormat('ms', 651500000, 150000000, 0, '8 day');

  describeValueFormat('none', 2.75e-10, 0, 10, '3e-10');
  describeValueFormat('none', 0, 0, 2, '0');
  describeValueFormat('dB', 10, 1000, 2, '10.00 dB');

  describeValueFormat('percent',  0, 0, 0, '0%');
  describeValueFormat('percent', 53, 0, 1, '53.0%');
  describeValueFormat('percentunit', 0.0, 0, 0, '0%');
  describeValueFormat('percentunit', 0.278, 0, 1, '27.8%');
  describeValueFormat('percentunit', 1.0, 0, 0, '100%');

  describeValueFormat('currencyUSD', 7.42, 10000, 2, '$7.42');
  describeValueFormat('currencyUSD', 1532.82, 1000, 1, '$1.53K');
  describeValueFormat('currencyUSD', 18520408.7, 10000000, 0, '$19M');

  describeValueFormat('bytes', -1.57e+308, -1.57e+308, 2, 'NA');

  describeValueFormat('ns', 25, 1, 0, '25 ns');
  describeValueFormat('ns', 2558, 50, 0, '2.56 µs');

  describeValueFormat('ops', 123, 1, 0, '123 ops');
  describeValueFormat('rps', 456000, 1000, -1, '456K rps');
  describeValueFormat('rps', 123456789, 1000000, 2, '123.457M rps');
  describeValueFormat('wps', 789000000, 1000000, -1, '789M wps');
  describeValueFormat('iops', 11000000000, 1000000000, -1, '11B iops');

  describeValueFormat('s', 1.23456789e-7, 1e-10, 8, '123.5 ns');
  describeValueFormat('s', 1.23456789e-4, 1e-7, 5, '123.5 µs');
  describeValueFormat('s', 1.23456789e-3, 1e-6, 4, '1.235 ms');
  describeValueFormat('s', 1.23456789e-2, 1e-5, 3, '12.35 ms');
  describeValueFormat('s', 1.23456789e-1, 1e-4, 2, '123.5 ms');
  describeValueFormat('s', 24, 1, 0, '24 s');
  describeValueFormat('s', 246, 1, 0, '4.1 min');
  describeValueFormat('s', 24567, 100, 0, '6.82 hour');
  describeValueFormat('s', 24567890, 10000, 0, '40.62 week');
  describeValueFormat('s', 24567890000, 1000000, 0, '778.53 year');

  describeValueFormat('m', 24, 1, 0, '24 min');
  describeValueFormat('m', 246, 10, 0, '4.1 hour');
  describeValueFormat('m', 6545, 10, 0, '4.55 day');
  describeValueFormat('m', 24567, 100, 0, '2.44 week');
  describeValueFormat('m', 24567892, 10000, 0, '46.7 year');

  describeValueFormat('h', 21, 1, 0, '21 hour');
  describeValueFormat('h', 145, 1, 0, '6.04 day');
  describeValueFormat('h', 1234, 100, 0, '7.3 week');
  describeValueFormat('h', 9458, 1000, 0, '1.08 year');

  describeValueFormat('d', 3, 1, 0, '3 day');
  describeValueFormat('d', 245, 100, 0, '35 week');
  describeValueFormat('d', 2456, 10, 0, '6.73 year');

  describe('kbn.toFixed and negative decimals', function() {
    it('should treat as zero decimals', function() {
      var str = kbn.toFixed(186.123, -2);
      expect(str).to.be('186');
    });
  });

  describe('kbn ms format when scaled decimals is null do not use it', function() {
    it('should use specified decimals', function() {
      var str = kbn.valueFormats['ms'](10000086.123, 1, null);
      expect(str).to.be('2.8 hour');
    });
  });

  describe('kbn kbytes format when scaled decimals is null do not use it', function() {
    it('should use specified decimals', function() {
      var str = kbn.valueFormats['kbytes'](10000000, 3, null);
      expect(str).to.be('9.537 GiB');
    });
  });

  describe('kbn deckbytes format when scaled decimals is null do not use it', function() {
    it('should use specified decimals', function() {
      var str = kbn.valueFormats['deckbytes'](10000000, 3, null);
      expect(str).to.be('10.000 GB');
    });
  });

  describe('kbn roundValue', function() {
    it('should should handle null value', function() {
      var str = kbn.roundValue(null, 2);
      expect(str).to.be(null);
    });
  });

  describe('calculateInterval', function() {
    it('1h 100 resultion', function() {
      var range = { from: dateMath.parse('now-1h'), to: dateMath.parse('now') };
      var res = kbn.calculateInterval(range, 100, null);
      expect(res.interval).to.be('30s');
    });

    it('10m 1600 resolution', function() {
      var range = { from: dateMath.parse('now-10m'), to: dateMath.parse('now') };
      var res = kbn.calculateInterval(range, 1600, null);
      expect(res.interval).to.be('500ms');
      expect(res.intervalMs).to.be(500);
    });

    it('fixed user min interval', function() {
      var range = {from: dateMath.parse('now-10m'), to: dateMath.parse('now')};
      var res = kbn.calculateInterval(range, 1600, '10s');
      expect(res.interval).to.be('10s');
      expect(res.intervalMs).to.be(10000);
    });

    it('short time range and user low limit', function() {
      var range = { from: dateMath.parse('now-10m'), to: dateMath.parse('now') };
      var res = kbn.calculateInterval(range, 1600, '>10s');
      expect(res.interval).to.be('10s');
    });

    it('large time range and user low limit', function() {
      var range = {from: dateMath.parse('now-14d'), to: dateMath.parse('now')};
      var res = kbn.calculateInterval(range, 1000, '>10s');
      expect(res.interval).to.be('20m');
    });

    it('10s 900 resolution and user low limit in ms', function() {
      var range = { from: dateMath.parse('now-10s'), to: dateMath.parse('now') };
      var res = kbn.calculateInterval(range, 900, '>15ms');
      expect(res.interval).to.be('15ms');
    });
  });

  describe('hex', function() {
    it('positive integer', function() {
      var str = kbn.valueFormats.hex(100, 0);
      expect(str).to.be('64');
    });
    it('negative integer', function() {
      var str = kbn.valueFormats.hex(-100, 0);
      expect(str).to.be('-64');
    });
    it('null', function() {
      var str = kbn.valueFormats.hex(null, 0);
      expect(str).to.be('');
    });
    it('positive float', function() {
      var str = kbn.valueFormats.hex(50.52, 1);
      expect(str).to.be('32.8');
    });
    it('negative float', function() {
      var str = kbn.valueFormats.hex(-50.333, 2);
      expect(str).to.be('-32.547AE147AE14');
    });
  });

  describe('hex 0x', function() {
    it('positive integeter', function() {
      var str = kbn.valueFormats.hex0x(7999,0);
      expect(str).to.be('0x1F3F');
    });
    it('negative integer', function() {
      var str = kbn.valueFormats.hex0x(-584,0);
      expect(str).to.be('-0x248');
    });
    it('null', function() {
      var str = kbn.valueFormats.hex0x(null, 0);
      expect(str).to.be('');
    });
    it('positive float', function() {
      var str = kbn.valueFormats.hex0x(74.443, 3);
      expect(str).to.be('0x4A.716872B020C4');
    });
    it('negative float', function() {
      var str = kbn.valueFormats.hex0x(-65.458, 1);
      expect(str).to.be('-0x41.8');
    });
  });

  describe('duration', function() {
    it('null', function() {
      var str = kbn.toDuration(null, 0, "millisecond");
      expect(str).to.be('');
    });
    it('0 milliseconds', function() {
      var str = kbn.toDuration(0, 0, "millisecond");
      expect(str).to.be('0 milliseconds');
    });
    it('1 millisecond', function() {
      var str = kbn.toDuration(1, 0, "millisecond");
      expect(str).to.be('1 millisecond');
    });
    it('-1 millisecond', function() {
      var str = kbn.toDuration(-1, 0, "millisecond");
      expect(str).to.be('1 millisecond ago');
    });
    it('seconds', function() {
      var str = kbn.toDuration(1, 0, "second");
      expect(str).to.be('1 second');
    });
    it('minutes', function() {
      var str = kbn.toDuration(1, 0, "minute");
      expect(str).to.be('1 minute');
    });
    it('hours', function() {
      var str = kbn.toDuration(1, 0, "hour");
      expect(str).to.be('1 hour');
    });
    it('days', function() {
      var str = kbn.toDuration(1, 0, "day");
      expect(str).to.be('1 day');
    });
    it('weeks', function() {
      var str = kbn.toDuration(1, 0, "week");
      expect(str).to.be('1 week');
    });
    it('months', function() {
      var str = kbn.toDuration(1, 0, "month");
      expect(str).to.be('1 month');
    });
    it('years', function() {
      var str = kbn.toDuration(1, 0, "year");
      expect(str).to.be('1 year');
    });
    it('decimal days', function() {
      var str = kbn.toDuration(1.5, 2, "day");
      expect(str).to.be('1 day, 12 hours, 0 minutes');
    });
    it('decimal months', function() {
      var str = kbn.toDuration(1.5, 3, "month");
      expect(str).to.be('1 month, 2 weeks, 1 day, 0 hours');
    });
    it('no decimals', function() {
      var str = kbn.toDuration(38898367008, 0, "millisecond");
      expect(str).to.be('1 year');
    });
    it('1 decimal', function() {
      var str = kbn.toDuration(38898367008, 1, "millisecond");
      expect(str).to.be('1 year, 2 months');
    });
    it('too many decimals', function() {
      var str = kbn.toDuration(38898367008, 20, "millisecond");
      expect(str).to.be('1 year, 2 months, 3 weeks, 4 days, 5 hours, 6 minutes, 7 seconds, 8 milliseconds');
    });
    it('floating point error', function() {
      var str = kbn.toDuration(36993906007, 8, "millisecond");
      expect(str).to.be('1 year, 2 months, 0 weeks, 3 days, 4 hours, 5 minutes, 6 seconds, 7 milliseconds');
    });
  });
});