import { describe, expect, it } from 'vitest'
import type { Reagent } from '../../types'
import {
  formatReagentExpiresIn,
  formatReagentExpiryDate,
  getReagentColumnValue,
  getReagentRowClasses,
  getReagentStockLevel,
  isReagentExpired,
  isReagentExpiringSoon,
  isReagentLowStock,
} from '../../components/ReagentList.presentation'

describe('ReagentList presentation helpers', () => {
  const reagent: Reagent = {
    id: 'reagent-1',
    name: 'Glucose',
    catalogNumber: 'G-7528',
    lotNumber: 'LOT-A',
    supplier: 'Sigma',
    expiryDate: '2026-06-01T00:00:00.000Z',
    stockLevel: 12,
  }

  it('extracts sortable values for table columns', () => {
    expect(getReagentColumnValue(reagent, 'name')).toBe('Glucose')
    expect(getReagentColumnValue(reagent, 'catalog')).toBe('G-7528')
    expect(getReagentColumnValue(reagent, 'expiry')).toBe(new Date(reagent.expiryDate!).getTime())
    expect(getReagentColumnValue({ id: 'empty', name: 'Empty' }, 'stock')).toBeUndefined()
  })

  it('classifies expiry states relative to a supplied date', () => {
    const now = new Date('2026-05-22T00:00:00.000Z')

    expect(isReagentExpired(reagent, now)).toBe(false)
    expect(isReagentExpiringSoon(reagent, 30, now)).toBe(true)
    expect(isReagentExpired({ ...reagent, expiryDate: '2026-05-01T00:00:00.000Z' }, now)).toBe(true)
  })

  it('should count whole days left when a reagent expires soon', () => {
    expect(formatReagentExpiresIn(reagent, new Date('2026-05-29T12:00:00.000Z'))).toBe('3 days left')
  })

  it('should use the singular when one day is left', () => {
    expect(formatReagentExpiresIn(reagent, new Date('2026-05-31T12:00:00.000Z'))).toBe('1 day left')
  })

  it('classifies low stock', () => {
    expect(isReagentLowStock(reagent, 15)).toBe(true)
    expect(getReagentStockLevel({ id: 'missing', name: 'Missing' })).toBe(0)
  })

  it('formats missing and present expiry dates', () => {
    expect(formatReagentExpiryDate(undefined)).toBe('-')
    expect(formatReagentExpiryDate('2026-06-01T00:00:00.000Z')).toBe('Jun 2026')
  })

  it('builds row state classes without mixing expired and expiring-soon', () => {
    expect(
      getReagentRowClasses(reagent, {
        lowStockThreshold: 15,
        draggedId: 'reagent-1',
        dragOverId: 'reagent-2',
        now: new Date('2026-05-22T00:00:00.000Z'),
      })
    ).toEqual([
      'mint-reagent-list__row',
      'mint-reagent-list__row--expiring-soon',
      'mint-reagent-list__row--low-stock',
      'mint-reagent-list__row--dragging',
    ])
  })
})