import { initRegionalFormatForTests } from '@grafana/i18n';

import { RawTimeRange, TimeRange } from '../types/time';
import * as featureToggles from '../utils/featureToggles';

import { dateTime } from './moment_wrapper';
import {
  convertRawToRange,
  describeInterval,
  describeTimeRange,
  isRelativeTimeRange,
  relativeToTimeRange,
  roundInterval,
  timeRangeToRelative,
} from './rangeutil';

describe('Range Utils', () => {
  // These tests probably wrap the dateTimeParser tests to some extent
  describe('convertRawToRange', () => {
    const DEFAULT_DATE_VALUE = '1996-07-30 16:00:00'; // Default format YYYY-MM-DD HH:mm:ss
    const DEFAULT_DATE_VALUE_FORMATTED = '1996-07-30T16:00:00-06:00';
    const defaultRawTimeRange = {
      from: DEFAULT_DATE_VALUE,
      to: '1996-07-30 16:20:00',
    };

    it('should serialize the default format by default', () => {
      const deserialized = convertRawToRange(defaultRawTimeRange);
      expect(deserialized.from.format()).toBe(DEFAULT_DATE_VALUE_FORMATTED);
    });

    it('should serialize using custom formats', () => {
      const NON_DEFAULT_FORMAT = 'DD-MM-YYYY HH:mm:ss';
      const nonDefaultRawTimeRange: RawTimeRange = {
        from: '30-07-1996 16:00:00',
        to: '30-07-1996 16:20:00',
      };

      const deserializedTimeRange = convertRawToRange(nonDefaultRawTimeRange, undefined, undefined, NON_DEFAULT_FORMAT);
      expect(deserializedTimeRange.from.format()).toBe(DEFAULT_DATE_VALUE_FORMATTED);
    });

    it('should take timezone into account', () => {
      const deserializedTimeRange = convertRawToRange(defaultRawTimeRange, 'UTC');
      expect(deserializedTimeRange.from.format()).toBe('1996-07-30T16:00:00Z');
    });

    it('should leave the raw part intact if it has calculations', () => {
      const timeRange = {
        from: 'now-6h',
        to: 'now',
      };

      const deserialized = convertRawToRange(timeRange);
      expect(deserialized.from).not.toBe(timeRange.from);
      expect(deserialized.raw.from).not.toBe(deserialized.from);
      expect(deserialized.raw.from).toBe(timeRange.from);
      expect(deserialized.to).not.toBe(timeRange.to);
      expect(deserialized.raw.to).not.toBe(deserialized.from);
      expect(deserialized.raw.to).toBe(timeRange.to);
    });

    it('should leave the raw part intact if it has calculations for "from"', () => {
      const timeRange = {
        from: 'now',
        to: DEFAULT_DATE_VALUE,
      };

      const deserialized = convertRawToRange(timeRange);
      expect(deserialized.from).not.toBe(timeRange.from);
      expect(deserialized.raw.from).not.toBe(deserialized.from);
      expect(deserialized.raw.from).toBe(timeRange.from);
      expect(deserialized.to).not.toBe(timeRange.to);
      expect(deserialized.raw.to).toBe(deserialized.to);
      expect(deserialized.raw.to).not.toBe(timeRange.to);
    });

    it('should leave the raw part intact if it has calculations for "to"', () => {
      const timeRange = {
        from: DEFAULT_DATE_VALUE,
        to: 'now',
      };

      const deserialized = convertRawToRange(timeRange);
      expect(deserialized.from).not.toBe(timeRange.from);
      expect(deserialized.raw.from).toBe(deserialized.from);
      expect(deserialized.raw.from).not.toBe(timeRange.from);
      expect(deserialized.to).not.toBe(timeRange.to);
      expect(deserialized.raw.to).not.toBe(deserialized.to);
      expect(deserialized.raw.to).toBe(timeRange.to);
    });
  });

  describe('relative time', () => {
    it('should identify absolute vs relative', () => {
      expect(
        isRelativeTimeRange({
          from: '1234',
          to: '4567',
        })
      ).toBe(false);
      expect(
        isRelativeTimeRange({
          from: 'now-5',
          to: 'now',
        })
      ).toBe(true);
    });
  });

  describe('describe_interval', () => {
    it('falls back to seconds if input is a number', () => {
      expect(describeInterval('123')).toEqual({
        sec: 1,
        type: 's',
        count: 123,
      });
    });

    it('parses a valid time unt string correctly', () => {
      expect(describeInterval('123h')).toEqual({
        sec: 3600,
        type: 'h',
        count: 123,
      });
    });

    it('fails if input is invalid', () => {
      expect(() => describeInterval('123xyz')).toThrow();
      expect(() => describeInterval('xyz')).toThrow();
    });

    it('should be able to parse negative values as well', () => {
      expect(describeInterval('-50ms')).toEqual({
        sec: 0.001,
        type: 'ms',
        count: -50,
      });
    });
  });

  describe('roundInterval', () => {
    it('rounds 9ms to 1ms', () => {
      expect(roundInterval(9)).toEqual(1);
    });

    it('rounds 14ms to 10ms', () => {
      expect(roundInterval(9)).toEqual(1);
    });

    it('rounds 34ms to 20ms', () => {
      expect(roundInterval(34)).toEqual(20);
    });

    it('rounds 74ms to 50ms', () => {
      expect(roundInterval(74)).toEqual(50);
    });

    it('rounds 149ms to 100ms', () => {
      expect(roundInterval(149)).toEqual(100);
    });

    it('rounds 349ms to 200ms', () => {
      expect(roundInterval(349)).toEqual(200);
    });

    it('rounds 749ms to 500ms', () => {
      expect(roundInterval(749)).toEqual(500);
    });

    it('rounds 1.5s to 1s', () => {
      expect(roundInterval(1499)).toEqual(1000);
    });

    it('rounds 3.5s to 2s', () => {
      expect(roundInterval(3499)).toEqual(2000);
    });

    it('rounds 7.5s to 5s', () => {
      expect(roundInterval(7499)).toEqual(5000);
    });

    it('rounds 12.5s to 10s', () => {
      expect(roundInterval(12499)).toEqual(10000);
    });

    it('rounds 17.5s to 15s', () => {
      expect(roundInterval(17499)).toEqual(15000);
    });

    it('rounds 25s to 20s', () => {
      expect(roundInterval(24999)).toEqual(20000);
    });

    it('rounds 45s to 30s', () => {
      expect(roundInterval(44999)).toEqual(30000);
    });

    it('rounds 1m30s to 1m', () => {
      expect(roundInterval(89999)).toEqual(60000);
    });

    it('rounds 3m30s to 2m', () => {
      expect(roundInterval(209999)).toEqual(120000);
    });

    it('rounds 7m30s to 5m', () => {
      expect(roundInterval(449999)).toEqual(300000);
    });

    it('rounds 12m30s to 10m', () => {
      expect(roundInterval(749999)).toEqual(600000);
    });

    it('rounds 17m30s to 15m', () => {
      expect(roundInterval(1049999)).toEqual(900000);
    });

    it('rounds 25m to 20m', () => {
      expect(roundInterval(1499999)).toEqual(1200000);
    });

    it('rounds 45m to 30m', () => {
      expect(roundInterval(2699999)).toEqual(1800000);
    });

    it('rounds 1h30m to 1h', () => {
      expect(roundInterval(5399999)).toEqual(3600000);
    });

    it('rounds 2h30m to 2h', () => {
      expect(roundInterval(8999999)).toEqual(7200000);
    });

    it('rounds 4h30m to 3h', () => {
      expect(roundInterval(16199999)).toEqual(10800000);
    });

    it('rounds 9h to 6h', () => {
      expect(roundInterval(32399999)).toEqual(21600000);
    });

    it('rounds 1d to 12h', () => {
      expect(roundInterval(86399999)).toEqual(43200000);
    });

    it('rounds 1w to 1d', () => {
      expect(roundInterval(604799999)).toEqual(86400000);
    });

    it('rounds 3w to 1w', () => {
      expect(roundInterval(1814399999)).toEqual(604800000);
    });

    it('rounds 6w to 30d', () => {
      expect(roundInterval(3628799999)).toEqual(2592000000);
    });

    it('rounds >6w to 1y', () => {
      expect(roundInterval(3628800000)).toEqual(31536000000);
    });
  });

  describe('relativeToTimeRange', () => {
    it('should convert seconds to timeRange', () => {
      const relativeTimeRange = { from: 600, to: 300 };
      const timeRange = relativeToTimeRange(relativeTimeRange, dateTime('2021-04-20T15:55:00Z'));

      expect(timeRange.from.valueOf()).toEqual(dateTime('2021-04-20T15:45:00Z').valueOf());
      expect(timeRange.to.valueOf()).toEqual(dateTime('2021-04-20T15:50:00Z').valueOf());
    });

    it('should convert from now', () => {
      const relativeTimeRange = { from: 600, to: 0 };
      const timeRange = relativeToTimeRange(relativeTimeRange, dateTime('2021-04-20T15:55:00Z'));

      expect(timeRange.from.valueOf()).toEqual(dateTime('2021-04-20T15:45:00Z').valueOf());
      expect(timeRange.to.valueOf()).toEqual(dateTime('2021-04-20T15:55:00Z').valueOf());
    });
  });

  describe('timeRangeToRelative', () => {
    it('should convert now-15m to relaitve time range', () => {
      const now = dateTime('2021-04-20T15:55:00Z');
      const timeRange: TimeRange = {
        from: dateTime(now).subtract(15, 'minutes'),
        to: now,
        raw: {
          from: 'now-15m',
          to: 'now',
        },
      };

      const relativeTimeRange = timeRangeToRelative(timeRange, now);

      expect(relativeTimeRange.from).toEqual(900);
      expect(relativeTimeRange.to).toEqual(0);
    });

    it('should convert now-2w, now-1w to relative range', () => {
      const now = dateTime('2021-04-20T15:55:00Z');
      const timeRange: TimeRange = {
        from: dateTime(now).subtract(2, 'weeks'),
        to: dateTime(now).subtract(1, 'week'),
        raw: {
          from: 'now-2w',
          to: 'now-1w',
        },
      };

      const relativeTimeRange = timeRangeToRelative(timeRange, now);

      expect(relativeTimeRange.from).toEqual(1209600);
      expect(relativeTimeRange.to).toEqual(604800);
    });
  });

  describe('describeTimeRange', () => {
    it.each([
      ['now-5m', 'now', 'Last 5 minutes'],
      ['now-15m', 'now', 'Last 15 minutes'],
      ['now-1h', 'now', 'Last 1 hour'],
      ['now-24h', 'now', 'Last 24 hours'],
      ['now-7d', 'now', 'Last 7 days'],
      ['now-30d', 'now', 'Last 30 days'],
      ['now/d', 'now/d', 'Today'],
      ['now/d', 'now', 'Today so far'],
      ['now/w', 'now/w', 'This week'],
      ['now/M', 'now/M', 'This month'],
      ['now/y', 'now/y', 'This year'],
      ['now-1d/d', 'now-1d/d', 'Yesterday'],
      ['now-1w/w', 'now-1w/w', 'Previous week'],
      ['now-1M/M', 'now-1M/M', 'Previous month'],
      ['now-1y/y', 'now-1y/y', 'Previous year'],
      ['now/fQ', 'now/fQ', 'This fiscal quarter'],
      ['now/fy', 'now/fy', 'This fiscal year'],
      ['now-1Q/fQ', 'now-1Q/fQ', 'Previous fiscal quarter'],
      ['now-1y/fy', 'now-1y/fy', 'Previous fiscal year'],
    ])('should return display name "%s" for range from "%s" to "%s"', (from, to, expected) => {
      expect(describeTimeRange({ from, to })).toBe(expected);
    });

    it('should prioritize custom quick ranges over standard ranges', () => {
      const customRanges = [{ from: 'now-5m', to: 'now', display: 'Lightning round!' }];

      expect(describeTimeRange({ from: 'now-5m', to: 'now' }, undefined, customRanges)).toBe('Lightning round!');
    });

    it('should format with the default timezone', () => {
      // Tests default to Pacific/Easter
      const from = dateTime('2023-01-15T10:30:00Z');
      const to = dateTime('2023-01-15T14:45:00Z');

      const result = describeTimeRange({ from, to });
      expect(result).toBe('2023-01-15 05:30:00 to 2023-01-15 09:45:00');
    });

    it('should respect timezone in datetime formatting', () => {
      const from = dateTime('2023-01-15T10:30:00Z');
      const to = dateTime('2023-01-15T14:45:00Z');

      const result = describeTimeRange({ from, to }, 'Australia/Sydney');
      expect(result).toBe('2023-01-15 21:30:00 to 2023-01-16 01:45:00');
    });

    it('should handle absolute from, relative to', () => {
      const from = dateTime('2023-01-15T10:30:00Z');
      const to = 'now';

      const result = describeTimeRange({ from, to });
      expect(result).toBe('2023-01-15 05:30:00 to a few seconds ago');
    });

    it('should handle relative from, absolute to', () => {
      const from = 'now-1h';
      const to = dateTime('2023-01-15T14:45:00Z');

      const result = describeTimeRange({ from, to });
      expect(result).toBe('an hour ago to 2023-01-15 09:45:00');
    });

    it('should handle invalid relative expressions', () => {
      const from = dateTime('2023-01-15T10:30:00Z');
      const to = 'invalid-expression';

      const result = describeTimeRange({ from, to });
      expect(result).toContain('Invalid date');
    });

    it('should handle empty custom ranges array', () => {
      expect(describeTimeRange({ from: 'now-5m', to: 'now' }, undefined, [])).toBe('Last 5 minutes');
    });

    it('should handle null custom ranges', () => {
      expect(describeTimeRange({ from: 'now-5m', to: 'now' }, undefined, undefined)).toBe('Last 5 minutes');
    });
  });

  describe('describeTimeRange - localeFormatPreference enabled', () => {
    let mockGetFeatureToggle: jest.SpyInstance;

    beforeAll(() => {
      initRegionalFormatForTests('en-AU');
      mockGetFeatureToggle = jest.spyOn(featureToggles, 'getFeatureToggle').mockImplementation((featureName) => {
        return featureName === 'localeFormatPreference';
      });
    });

    afterAll(() => {
      mockGetFeatureToggle.mockRestore();
    });

    it.each([
      ['now-5m', 'now', 'Last 5 minutes'],
      ['now-15m', 'now', 'Last 15 minutes'],
      ['now-1h', 'now', 'Last 1 hour'],
      ['now-7d', 'now', 'Last 7 days'],
      ['now/d', 'now/d', 'Today'],
      ['now/d', 'now', 'Today so far'],
      ['now/w', 'now/w', 'This week'],
      ['now-1d/d', 'now-1d/d', 'Yesterday'],
      ['now-1w/w', 'now-1w/w', 'Previous week'],
      ['now-1y/y', 'now-1y/y', 'Previous year'],
      ['now/fQ', 'now/fQ', 'This fiscal quarter'],
      ['now-1Q/fQ', 'now-1Q/fQ', 'Previous fiscal quarter'],
    ])('should return display name "%s" for range from "%s" to "%s"', (from, to, expected) => {
      expect(describeTimeRange({ from, to })).toBe(expected);
    });

    it('should prioritize custom quick ranges over standard ranges', () => {
      const customRanges = [{ from: 'now-5m', to: 'now', display: 'Lightning round!' }];

      expect(describeTimeRange({ from: 'now-5m', to: 'now' }, undefined, customRanges)).toBe('Lightning round!');
    });

    it('should format with the default timezone', () => {
      // Tests default to Pacific/Easter
      const from = dateTime('2023-01-15T10:30:00Z');
      const to = dateTime('2023-01-15T14:45:00Z');

      const result = describeTimeRange({ from, to });
      expect(result).toBe('15/1/23, 5:30 – 9:45 am');
    });

    it('should respect timezone in datetime formatting', () => {
      const from = dateTime('2023-01-15T10:30:00Z');
      const to = dateTime('2023-01-15T14:45:00Z');

      const result = describeTimeRange({ from, to }, 'Australia/Sydney');
      expect(result).toBe('15/1/23, 9:30 pm – 16/1/23, 1:45 am');
    });

    it('should include seconds in the output if the time has seconds', () => {
      const from = dateTime('2023-01-15T10:30:00Z');
      const to = dateTime('2023-01-15T14:45:12Z');

      const result = describeTimeRange({ from, to });
      expect(result).toBe('15/1/23, 5:30:00 am – 9:45:12 am');
    });

    it('should handle absolute from, relative to', () => {
      const from = dateTime('2023-01-15T10:30:00Z');
      const to = 'now';

      const result = describeTimeRange({ from, to });
      expect(result).toBe('15/01/2023, 5:30 am to a few seconds ago');
    });

    it('should handle relative from, absolute to', () => {
      const from = 'now-1h';
      const to = dateTime('2023-01-15T14:45:00Z');

      const result = describeTimeRange({ from, to });
      expect(result).toBe('an hour ago to 15/01/2023, 9:45 am');
    });

    it('should handle invalid relative expressions', () => {
      const from = dateTime('2023-01-15T10:30:00Z');
      const to = 'invalid-expression';

      const result = describeTimeRange({ from, to });
      expect(result).toContain('Invalid date');
    });

    it('should handle empty custom ranges array', () => {
      expect(describeTimeRange({ from: 'now-5m', to: 'now' }, undefined, [])).toBe('Last 5 minutes');
    });

    it('should handle null custom ranges', () => {
      expect(describeTimeRange({ from: 'now-5m', to: 'now' }, undefined, undefined)).toBe('Last 5 minutes');
    });
  });
});