import {describe, expect, it} from 'vitest'
import {dayRangeRole, normalizeRange, resolveRangeBounds} from './dateRange'

describe('dateRange', () => {
  describe('normalizeRange', () => {
    it('keeps an already ordered pair', () => {
      expect(normalizeRange('2026-05-19', '2026-05-25')).toEqual({start: '2026-05-19', end: '2026-05-25'})
    })
    it('swaps a reversed pair', () => {
      expect(normalizeRange('2026-05-25', '2026-05-19')).toEqual({start: '2026-05-19', end: '2026-05-25'})
    })
    it('handles an equal pair', () => {
      expect(normalizeRange('2026-05-19', '2026-05-19')).toEqual({start: '2026-05-19', end: '2026-05-19'})
    })
  })

  describe('resolveRangeBounds', () => {
    it('returns null without a start', () => {
      expect(resolveRangeBounds(null, null, null)).toBeNull()
    })
    it('returns a single-point range when only start is set', () => {
      expect(resolveRangeBounds('2026-05-19', null, null)).toEqual({lo: '2026-05-19', hi: '2026-05-19'})
    })
    it('orders start and committed end', () => {
      expect(resolveRangeBounds('2026-05-19', '2026-05-25', null)).toEqual({lo: '2026-05-19', hi: '2026-05-25'})
    })
    it('uses preview when end is not set', () => {
      expect(resolveRangeBounds('2026-05-19', null, '2026-05-22')).toEqual({lo: '2026-05-19', hi: '2026-05-22'})
    })
    it('inverts when preview is before start', () => {
      expect(resolveRangeBounds('2026-05-19', null, '2026-05-10')).toEqual({lo: '2026-05-10', hi: '2026-05-19'})
    })
    it('prioritises committed end over preview', () => {
      expect(resolveRangeBounds('2026-05-19', '2026-05-25', '2026-05-30')).toEqual({lo: '2026-05-19', hi: '2026-05-25'})
    })
  })

  describe('dayRangeRole', () => {
    const bounds = {lo: '2026-05-19', hi: '2026-05-25'}
    it('returns none without bounds', () => {
      expect(dayRangeRole('2026-05-20', null)).toBe('none')
    })
    it('returns single when lo === hi and matches', () => {
      expect(dayRangeRole('2026-05-19', {lo: '2026-05-19', hi: '2026-05-19'})).toBe('single')
      expect(dayRangeRole('2026-05-20', {lo: '2026-05-19', hi: '2026-05-19'})).toBe('none')
    })
    it('returns start, end and in-range', () => {
      expect(dayRangeRole('2026-05-19', bounds)).toBe('start')
      expect(dayRangeRole('2026-05-25', bounds)).toBe('end')
      expect(dayRangeRole('2026-05-22', bounds)).toBe('in-range')
    })
    it('returns none outside the bounds', () => {
      expect(dayRangeRole('2026-05-10', bounds)).toBe('none')
      expect(dayRangeRole('2026-05-30', bounds)).toBe('none')
    })
  })
})