import { describe, expect, it } from 'vitest'
import { useCalendarGrid } from '../../composables/useCalendarGrid'

describe('useCalendarGrid', () => {
  it('builds a stable 42-day month grid with previous and next month padding', () => {
    const calendar = useCalendarGrid()
    calendar.setCurrentMonthFromDate(new Date('2026-05-07T12:00:00'))

    expect(calendar.weekDays).toEqual(['Su', 'Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa'])
    expect(calendar.monthYear.value).toBe('May 2026')
    expect(calendar.calendarDays.value).toHaveLength(42)
    expect(calendar.calendarDays.value[0].date.getMonth()).toBe(3)
    expect(calendar.calendarDays.value.some(day => day.isCurrentMonth && day.date.getDate() === 7)).toBe(true)
  })

  it('applies min and max date bounds at day precision', () => {
    const calendar = useCalendarGrid({
      min: () => '2026-05-05T14:00:00',
      max: () => '2026-05-10T09:00:00',
    })

    expect(calendar.isDateDisabled(new Date('2026-05-04T23:59:00'))).toBe(true)
    expect(calendar.isDateDisabled(new Date('2026-05-05T00:00:00'))).toBe(false)
    expect(calendar.isDateDisabled(new Date('2026-05-10T23:59:00'))).toBe(false)
    expect(calendar.isDateDisabled(new Date('2026-05-11T00:00:00'))).toBe(true)
  })

  it('formats dates and advances months', () => {
    const calendar = useCalendarGrid()
    calendar.setCurrentMonthFromDate(new Date('2026-01-15T00:00:00'))

    expect(calendar.formatDateValue(new Date('2026-01-05T13:00:00'))).toBe('2026-01-05')
    calendar.nextMonth()
    expect(calendar.monthYear.value).toBe('February 2026')
    calendar.prevMonth()
    expect(calendar.monthYear.value).toBe('January 2026')
  })
})