/* global describe it expect afterAll  */
import moment from 'moment-timezone';
import sinon from 'sinon';

import {
  prepUniqueDaysByHours,
  calcCurrentStreak,
  calcLongestStreak
} from './user-stats';

// setting now to 2016-02-03T11:00:00 (PST)
const clock = sinon.useFakeTimers(1454526000000);
const PST = 'America/Los_Angeles';

describe('user stats', () => {
  afterAll(() => {
    clock.restore();
  });

  describe('prepUniqueDaysByHours', () => {
    it(
      'should return correct epoch when all entries fall into ' +
        'one day in UTC',
      () => {
        expect(
          prepUniqueDaysByHours([
            moment.utc('8/3/2015 2:00', 'M/D/YYYY H:mm').valueOf(),
            moment.utc('8/3/2015 14:00', 'M/D/YYYY H:mm').valueOf(),
            moment.utc('8/3/2015 20:00', 'M/D/YYYY H:mm').valueOf()
          ])
        ).toEqual([1438567200000]);
      }
    );

    it('should return correct epoch when given two identical dates', () => {
      expect(
        prepUniqueDaysByHours([
          moment.utc('8/3/2015 2:00', 'M/D/YYYY H:mm').valueOf(),
          moment.utc('8/3/2015 2:00', 'M/D/YYYY H:mm').valueOf()
        ])
      ).toEqual([1438567200000]);
    });

    it('should return 2 epochs when dates fall into two days in PST', () => {
      expect(
        prepUniqueDaysByHours(
          [
            // 8/2/2015 in America/Los_Angeles
            moment.utc('8/3/2015 2:00', 'M/D/YYYY H:mm').valueOf(),
            moment.utc('8/3/2015 14:00', 'M/D/YYYY H:mm').valueOf(),
            moment.utc('8/3/2015 20:00', 'M/D/YYYY H:mm').valueOf()
          ],
          PST
        )
      ).toEqual([1438567200000, 1438610400000]);
    });

    it('should return 3 epochs when dates fall into three days', () => {
      expect(
        prepUniqueDaysByHours([
          moment.utc('8/1/2015 2:00', 'M/D/YYYY H:mm').valueOf(),
          moment.utc('3/3/2015 14:00', 'M/D/YYYY H:mm').valueOf(),
          moment.utc('9/30/2014 20:00', 'M/D/YYYY H:mm').valueOf()
        ])
      ).toEqual([1412107200000, 1425391200000, 1438394400000]);
    });

    it(
      'should return same but sorted array if all input dates are ' +
        'start of day',
      () => {
        expect(
          prepUniqueDaysByHours([1438387200000, 1425340800000, 1412035200000])
        ).toEqual([1412035200000, 1425340800000, 1438387200000]);
      }
    );
  });

  describe('calcCurrentStreak', function() {
    it('should return 1 day when today one challenge was completed', () => {
      expect(
        calcCurrentStreak(
          prepUniqueDaysByHours([
            moment.utc(moment.utc().subtract(1, 'hours')).valueOf()
          ])
        )
      ).toEqual(1);
    });

    it(
      'should return 1 day when today more than one challenge ' +
        'was completed',
      () => {
        expect(
          calcCurrentStreak(
            prepUniqueDaysByHours([
              moment.utc(moment.utc().subtract(1, 'hours')).valueOf(),
              moment.utc(moment.utc().subtract(1, 'hours')).valueOf()
            ])
          )
        ).toEqual(1);
      }
    );

    it('should return 0 days when today 0 challenges were completed', () => {
      expect(
        calcCurrentStreak(
          prepUniqueDaysByHours([
            moment.utc('9/11/2015 4:00', 'M/D/YYYY H:mm').valueOf()
          ])
        )
      ).toEqual(0);
    });

    it(
      'should return 2 days when today and yesterday challenges were ' +
        'completed',
      () => {
        expect(
          calcCurrentStreak(
            prepUniqueDaysByHours([
              moment.utc(moment.utc().subtract(1, 'days')).valueOf(),
              moment.utc(moment.utc().subtract(1, 'hours')).valueOf()
            ])
          )
        ).toEqual(2);
      }
    );

    it(
      'should return 3 when today and for two days before user was ' + 'active',
      () => {
        expect(
          calcCurrentStreak(
            prepUniqueDaysByHours([
              moment.utc('8/3/2015 2:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/11/2015 4:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/12/2015 1:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/12/2015 1:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/12/2015 2:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/12/2015 3:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/13/2015 4:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/14/2015 5:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc(moment.utc().subtract(2, 'days')).valueOf(),
              moment.utc(moment.utc().subtract(1, 'days')).valueOf(),
              moment.utc(moment.utc().subtract(1, 'hours')).valueOf()
            ])
          )
        ).toEqual(3);
      }
    );

    it(
      'should return 1 when there is a 1.5 day long break and ' +
        'dates fall into two days separated by third',
      () => {
        expect(
          calcCurrentStreak(
            prepUniqueDaysByHours([
              moment.utc(moment.utc().subtract(47, 'hours')).valueOf(),
              moment.utc(moment.utc().subtract(11, 'hours')).valueOf()
            ])
          )
        ).toEqual(1);
      }
    );

    it(
      'should return 2 when the break is more than 1.5 days ' +
        'but dates fall into two consecutive days',
      () => {
        expect(
          calcCurrentStreak(
            prepUniqueDaysByHours([
              moment.utc(moment.utc().subtract(40, 'hours')).valueOf(),
              moment.utc(moment.utc().subtract(1, 'hours')).valueOf()
            ])
          )
        ).toEqual(2);
      }
    );

    it(
      'should return correct count in default timezone UTC ' +
        'given `undefined` timezone',
      () => {
        expect(
          calcCurrentStreak(
            prepUniqueDaysByHours([
              moment.utc(moment.utc().subtract(1, 'hours')).valueOf(),
              moment.utc(moment.utc().subtract(1, 'hours')).valueOf()
            ])
          )
        ).toEqual(1);
      }
    );

    it(
      'should return 2 days when today and yesterday ' +
        'challenges were completed given PST',
      () => {
        expect(
          calcCurrentStreak(
            prepUniqueDaysByHours(
              [
                moment.utc(moment.utc().subtract(1, 'days')).valueOf(),
                moment.utc(moment.utc().subtract(1, 'hours')).valueOf()
              ],
              PST
            ),
            PST
          )
        ).toEqual(2);
      }
    );

    it(
      'should return 17 when there is no break in given timezone ' +
        '(but would be the break if in UTC)',
      () => {
        expect(
          calcCurrentStreak(
            prepUniqueDaysByHours(
              [
                1453174506164,
                1453175436725,
                1453252466853,
                1453294968225,
                1453383782844,
                1453431903117,
                1453471373080,
                1453594733026,
                1453645014058,
                1453746762747,
                1453747659197,
                1453748029416,
                1453818029213,
                1453951796007,
                1453988570615,
                1454069704441,
                1454203673979,
                1454294055498,
                1454333545125,
                1454415163903,
                1454519128123,
                moment.tz(PST).valueOf()
              ],
              PST
            ),
            PST
          )
        ).toEqual(17);
      }
    );

    it(
      'should return 4 when there is a break in UTC ' +
        '(but would be no break in PST)',
      () => {
        expect(
          calcCurrentStreak(
            prepUniqueDaysByHours([
              1453174506164,
              1453175436725,
              1453252466853,
              1453294968225,
              1453383782844,
              1453431903117,
              1453471373080,
              1453594733026,
              1453645014058,
              1453746762747,
              1453747659197,
              1453748029416,
              1453818029213,
              1453951796007,
              1453988570615,
              1454069704441,
              1454203673979,
              1454294055498,
              1454333545125,
              1454415163903,
              1454519128123,
              moment.utc().valueOf()
            ])
          )
        ).toEqual(4);
      }
    );
  });

  describe('calcLongestStreak', function() {
    it(
      'should return 1 when there is the only one one-day-long ' +
        'streak available',
      () => {
        expect(
          calcLongestStreak(
            prepUniqueDaysByHours([
              moment.utc('9/12/2015 4:00', 'M/D/YYYY H:mm').valueOf()
            ])
          )
        ).toEqual(1);
      }
    );

    it(
      'should return 4 when there is the only one ' +
        'more-than-one-days-long streak available',
      () => {
        expect(
          calcLongestStreak(
            prepUniqueDaysByHours([
              moment.utc('9/11/2015 4:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/12/2015 2:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/13/2015 3:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/14/2015 1:00', 'M/D/YYYY H:mm').valueOf()
            ])
          )
        ).toEqual(4);
      }
    );

    it(
      'should return 1 when there is only one one-day-long streak ' +
        'and it is today',
      () => {
        expect(
          calcLongestStreak(
            prepUniqueDaysByHours([
              moment.utc(moment.utc().subtract(1, 'hours')).valueOf()
            ])
          )
        ).toEqual(1);
      }
    );

    it('should return 2 when yesterday and today makes longest streak', () => {
      expect(
        calcLongestStreak(
          prepUniqueDaysByHours([
            moment.utc(moment.utc().subtract(1, 'days')).valueOf(),
            moment.utc(moment.utc().subtract(1, 'hours')).valueOf()
          ])
        )
      ).toEqual(2);
    });

    it('should return 4 when there is a month long break', () => {
      expect(
        calcLongestStreak(
          prepUniqueDaysByHours([
            moment.utc('8/3/2015 2:00', 'M/D/YYYY H:mm').valueOf(),
            moment.utc('9/11/2015 4:00', 'M/D/YYYY H:mm').valueOf(),
            moment.utc('9/12/2015 2:00', 'M/D/YYYY H:mm').valueOf(),
            moment.utc('10/4/2015 1:00', 'M/D/YYYY H:mm').valueOf(),
            moment.utc('10/5/2015 5:00', 'M/D/YYYY H:mm').valueOf(),
            moment.utc('10/6/2015 4:00', 'M/D/YYYY H:mm').valueOf(),
            moment.utc('10/7/2015 5:00', 'M/D/YYYY H:mm').valueOf(),
            moment.utc('11/3/2015 2:00', 'M/D/YYYY H:mm').valueOf()
          ])
        )
      ).toEqual(4);
    });

    it(
      'should return 2 when there is a more than 1.5 days ' +
        'long break of (36 hours)',
      () => {
        expect(
          calcLongestStreak(
            prepUniqueDaysByHours([
              moment.utc('8/3/2015 2:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/11/2015 4:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/12/2015 15:30', 'M/D/YYYY H:mm').valueOf(),
              moment
                .utc(
                  moment
                    .utc('9/12/2015 15:30', 'M/D/YYYY H:mm')
                    .add(37, 'hours')
                )
                .valueOf(),
              moment.utc('9/14/2015 22:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/15/2015 4:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('10/3/2015 2:00', 'M/D/YYYY H:mm').valueOf()
            ])
          )
        ).toEqual(2);
      }
    );

    it(
      'should return 4 when the longest streak consist of ' +
        'several same day timestamps',
      () => {
        expect(
          calcLongestStreak(
            prepUniqueDaysByHours([
              moment.utc('8/3/2015 2:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/11/2015 4:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/12/2015 1:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/12/2015 1:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/12/2015 2:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/12/2015 3:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/13/2015 4:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/14/2015 5:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc(moment.utc().subtract(2, 'days')).valueOf(),
              moment.utc(moment.utc().subtract(1, 'days')).valueOf(),
              moment.utc().valueOf()
            ])
          )
        ).toEqual(4);
      }
    );

    it(
      'should return 4 when there are several longest streaks ' +
        '(same length)',
      () => {
        expect(
          calcLongestStreak(
            prepUniqueDaysByHours([
              moment.utc('8/3/2015 2:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/11/2015 4:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/12/2015 1:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/13/2015 4:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/14/2015 5:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('10/11/2015 4:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('10/12/2015 1:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('10/13/2015 4:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('10/14/2015 5:00', 'M/D/YYYY H:mm').valueOf()
            ])
          )
        ).toEqual(4);
      }
    );

    it(
      'should return correct longest streak when there is a very ' +
        'long period',
      () => {
        let cals = [];
        const n = 100;
        for (let i = 0; i < n; i++) {
          cals.push(moment.utc(moment.utc().subtract(i, 'days')).valueOf());
        }

        expect(calcLongestStreak(prepUniqueDaysByHours(cals))).toEqual(n);
      }
    );

    it(
      'should return correct longest streak in default timezone ' +
        'UTC given `undefined` timezone',
      () => {
        expect(
          calcLongestStreak(
            prepUniqueDaysByHours([
              moment.utc(moment.utc().subtract(1, 'days')).valueOf(),
              moment.utc(moment.utc().subtract(1, 'hours')).valueOf()
            ])
          )
        ).toEqual(2);
      }
    );

    it(
      'should return 4 when there is the only one more-than-one-days-long ' +
        'streak available given PST',
      () => {
        expect(
          calcLongestStreak(
            prepUniqueDaysByHours([
              moment.utc('9/11/2015 4:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/12/2015 2:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/13/2015 3:00', 'M/D/YYYY H:mm').valueOf(),
              moment.utc('9/14/2015 1:00', 'M/D/YYYY H:mm').valueOf()
            ]),
            PST
          )
        ).toEqual(4);
      }
    );

    it(
      'should return 3 when longest streak is 3 in PST ' +
        '(but would be different in default timezone UTC)',
      () => {
        expect(
          calcLongestStreak(
            prepUniqueDaysByHours(
              [
                moment.utc('9/11/2015 23:00', 'M/D/YYYY H:mm').valueOf(),
                moment.utc('9/12/2015 2:00', 'M/D/YYYY H:mm').valueOf(),
                moment.utc('9/13/2015 2:00', 'M/D/YYYY H:mm').valueOf(),
                moment.utc('9/14/2015 6:00', 'M/D/YYYY H:mm').valueOf()
              ],
              PST
            ),
            PST
          )
        ).toEqual(3);
      }
    );

    it(
      'should return 17 when there is no break in PST ' +
        '(but would be break in UTC) and it is current',
      () => {
        expect(
          calcLongestStreak(
            prepUniqueDaysByHours(
              [
                1453174506164,
                1453175436725,
                1453252466853,
                1453294968225,
                1453383782844,
                1453431903117,
                1453471373080,
                1453594733026,
                1453645014058,
                1453746762747,
                1453747659197,
                1453748029416,
                1453818029213,
                1453951796007,
                1453988570615,
                1454069704441,
                1454203673979,
                1454294055498,
                1454333545125,
                1454415163903,
                1454519128123,
                moment.tz(PST).valueOf()
              ],
              PST
            ),
            PST
          )
        ).toEqual(17);
      }
    );

    it(
      'should return a streak of 4 when there is a break in UTC ' +
        '(but no break in PST)',
      () => {
        expect(
          calcLongestStreak(
            prepUniqueDaysByHours([
              1453174506164,
              1453175436725,
              1453252466853,
              1453294968225,
              1453383782844,
              1453431903117,
              1453471373080,
              1453594733026,
              1453645014058,
              1453746762747,
              1453747659197,
              1453748029416,
              1453818029213,
              1453951796007,
              1453988570615,
              1454069704441,
              1454203673979,
              1454294055498,
              1454333545125,
              1454415163903,
              1454519128123,
              moment.utc().valueOf()
            ])
          )
        ).toEqual(4);
      }
    );
  });
});