workavia-calendar-front/__test__/features/Calendars/TimezoneInGrid.test.tsx

import CalendarApp from '@/components/Calendar/Calendar'
import * as calendarUtils from '@/components/Calendar/utils/calendarUtils'
import { updateSlotLabelVisibility } from '@/components/Calendar/utils/calendarUtils'
import EventPreviewModal from '@/features/Events/EventPreview'
import { CalendarEvent } from '@/features/Events/EventsTypes'
import * as SettingsSlice from '@/features/Settings/SettingsSlice'
import { fireEvent, screen, waitFor } from '@testing-library/react'
import { renderWithProviders } from '../../utils/Renderwithproviders'

describe('Calendar - Timezone Integration', () => {
  const mockCalendarRef = { current: null }

  const baseState = {
    user: {
      userData: {
        sub: 'test',
        email: 'test@test.com',
        sid: 'testSid',
        openpaasId: 'user1'
      }
    },
    calendars: {
      list: {
        'user1/cal1': {
          id: 'user1/cal1',
          link: '/calendars/user1/cal1.json',
          name: 'Test Calendar',
          description: '',
          color: '#33B679',
          owner: { firstname: 'user1', emails: ['test@test.com'] },
          visibility: 'public',
          events: {}
        }
      },
      timeZone: 'America/New_York',
      pending: false
    }
  }

  beforeEach(() => {
    jest.clearAllMocks()
  })

  it('renders TimezoneSelector in week view', async () => {
    renderWithProviders(
      <CalendarApp calendarRef={mockCalendarRef} />,
      baseState
    )

    // Look for timezone selector button (should show offset)
    await waitFor(() => {
      expect(screen.getByText(/UTC/)).toBeInTheDocument()
    })
  })

  it('dispatches setTimeZone action when timezone is changed', async () => {
    const setTimeZoneSpy = jest.spyOn(SettingsSlice, 'setTimeZone')

    renderWithProviders(
      <CalendarApp calendarRef={mockCalendarRef} />,
      baseState
    )

    // Find and click timezone selector
    await waitFor(() => {
      const timezoneButton = screen.getByText(/UTC/i)
      fireEvent.click(timezoneButton)

      // Select a different timezone
      const autocomplete = screen.getByRole('combobox')
      fireEvent.change(autocomplete, { target: { value: 'Tokyo' } })
    })
    const option = await screen.findByText(/Tokyo/i)
    fireEvent.click(option)

    expect(setTimeZoneSpy).toHaveBeenCalledWith('Asia/Tokyo')
  })
})

describe('Calendar - Timezone Slot Label Visibility', () => {
  it('hides slot labels within 15 minutes of current time', () => {
    const currentTime = new Date('2025-01-15T14:30:00Z')
    const timezone = 'UTC'
    jest
      .spyOn(calendarUtils, 'checkIfCurrentWeekOrDay')
      .mockImplementation(() => true)

    // 14:25 - within 15 minutes
    const slot1425 = { text: '14:25' }
    expect(updateSlotLabelVisibility(currentTime, slot1425, timezone)).toBe(
      'timegrid-slot-label-hidden'
    )

    // 14:30 - exact match
    const slot1430 = { text: '14:30' }
    expect(updateSlotLabelVisibility(currentTime, slot1430, timezone)).toBe(
      'timegrid-slot-label-hidden'
    )

    // 14:35 - within 15 minutes
    const slot1435 = { text: '14:35' }
    expect(updateSlotLabelVisibility(currentTime, slot1435, timezone)).toBe(
      'timegrid-slot-label-hidden'
    )
  })

  it('shows slot labels more than 15 minutes from current time', () => {
    jest
      .spyOn(calendarUtils, 'checkIfCurrentWeekOrDay')
      .mockImplementation(() => true)

    const currentTime = new Date('2025-01-15T14:30:00')
    const timezone = 'UTC'

    // 14:00 - 30 minutes before
    const slot1400 = { text: '14:00' }
    expect(updateSlotLabelVisibility(currentTime, slot1400, timezone)).toBe(
      'fc-timegrid-slot-label'
    )

    // 15:00 - 30 minutes after
    const slot1500 = { text: '15:00' }
    expect(updateSlotLabelVisibility(currentTime, slot1500, timezone)).toBe(
      'fc-timegrid-slot-label'
    )
  })

  it('returns visible class when not in current week/day', () => {
    jest
      .spyOn(calendarUtils, 'checkIfCurrentWeekOrDay')
      .mockImplementation(() => false)
    const currentTime = new Date('2025-01-15T14:30:00')
    const timezone = 'UTC'
    const slot = { text: '14:30' }

    // Should return visible class when not in current view
    const result = updateSlotLabelVisibility(currentTime, slot, timezone)
    expect(result).toBe('fc-timegrid-slot-label')
  })
})

describe('EventDisplayPreview - Timezone Display', () => {
  const mockOnClose = jest.fn()

  const baseEvent: CalendarEvent = {
    uid: 'event1',
    title: 'Team Meeting',
    start: new Date('2025-01-15T14:00:00Z'),
    end: new Date('2025-01-15T15:00:00Z'),
    calendarId: 'user1/cal1',
    allday: false
  }

  const allDayEvent = {
    ...baseEvent,
    allday: true,
    start: new Date('2025-01-15'),
    end: new Date('2025-01-16')
  }

  const baseState = {
    user: {
      userData: {
        sub: 'test',
        email: 'test@test.com',
        sid: 'testSid',
        openpaasId: 'user1'
      }
    },
    calendars: {
      list: {
        'user1/cal1': {
          id: 'user1/cal1',
          name: 'Test Calendar',
          color: '#33B679',
          owner: { firstname: 'user1', emails: ['test@test.com'] },
          visibility: 'public',
          events: {
            event1: baseEvent,
            allDayEvent
          }
        }
      },
      timeZone: 'America/New_York',
      pending: false
    }
  }

  beforeEach(() => {
    jest.clearAllMocks()
  })

  it('does not show timezone offset for all-day events', async () => {
    renderWithProviders(
      <EventPreviewModal
        open={true}
        onClose={mockOnClose}
        eventId="allDayEvent"
        calId="user1/cal1"
      />,
      baseState
    )

    await waitFor(() => {
      const title = screen.getByText(/Team Meeting/i)
      expect(title).toBeInTheDocument()
    })

    // Should not show UTC offset
    expect(screen.queryByText(/UTC[+-]\d+/i)).not.toBeInTheDocument()
  })

  it('displays correct timezone offset for different timezones', async () => {
    const timezones = [
      { tz: 'America/New_York', expectedOffset: /UTC[-−][45]/ },
      { tz: 'Europe/Paris', expectedOffset: /UTC\+[12]/ },
      { tz: 'Asia/Tokyo', expectedOffset: /UTC\+9/ },
      { tz: 'Australia/Sydney', expectedOffset: /UTC\+1[01]/ },
      { tz: 'Asia/Kolkata', expectedOffset: /UTC\+5:30/ }
    ]

    for (const { tz, expectedOffset } of timezones) {
      const state = {
        ...baseState,
        settings: {
          timeZone: tz
        }
      }

      renderWithProviders(
        <EventPreviewModal
          open={true}
          eventId="event1"
          calId="user1/cal1"
          onClose={mockOnClose}
        />,
        state
      )

      await waitFor(() => {
        const content = document.body.textContent || ''
        expect(content).toMatch(expectedOffset)
      })
    }
  })
})