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', 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 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 str = kbn.calculateInterval(range, 100, null);
      expect(str).to.be('30s');
    });

    it('10m 1600 resolution', function() {
      var range = { from: dateMath.parse('now-10m'), to: dateMath.parse('now') };
      var str = kbn.calculateInterval(range, 1600, null);
      expect(str).to.be('100ms');
    });

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

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

    it('large time range and user low limit', function() {
      var range = { from: dateMath.parse('now-14d'), to: dateMath.parse('now') };
      var str = kbn.calculateInterval(range, 1000, '>10s');
      expect(str).to.be('30m');
    });
  });
});
