import { jest } from '@jest/globals'

jest.unstable_mockModule('../redis-client.js', () => ({
  default: {
    get: jest.fn(async () => null),
    setEx: jest.fn(async () => 'OK'),
  },
}))

jest.unstable_mockModule('axios', () => ({
  default: {
    get: jest.fn(async () => ({ data: { products: [] } })),
  },
}))

const { transformOFFProduct, searchBabyProducts, getBabyProductDetails } = await import('../off-service.js')

describe('transformOFFProduct', () => {
  test('transforms a valid OFF product to unified model', () => {
    const offProduct = {
      _id: '12345',
      product_name: 'Baby Rice',
      brands: 'Nestlé',
      image_url: 'https://example.com/image.jpg',
      nutriscore_grade: 'a',
      ingredients_text: 'Rice, Iron, Vitamins',
      nova_group: 1,
      ecoscore_grade: 'b',
      categories_tags: ['en:baby-foods', 'en:baby-rice'],
    }

    const result = transformOFFProduct(offProduct)

    expect(result).toEqual({
      id: '12345',
      source: 'openfoodfacts',
      name: 'Baby Rice',
      brand: 'Nestlé',
      category: 'baby_food',
      image_url: 'https://example.com/image.jpg',
      nutriscore: 'a',
      ingredients: 'Rice, Iron, Vitamins',
      nova_group: 1,
      eco_score: 'b',
    })
  })

  test('returns null for null/undefined input', () => {
    expect(transformOFFProduct(null)).toBeNull()
    expect(transformOFFProduct(undefined)).toBeNull()
  })

  test('returns null when missing required fields', () => {
    expect(transformOFFProduct({ _id: '123' })).toBeNull()
    expect(transformOFFProduct({ product_name: 'Test' })).toBeNull()
  })

  test('sets default brand to empty string when missing', () => {
    const result = transformOFFProduct({
      _id: '999',
      product_name: 'Plain Product',
    })
    expect(result.brand).toBe('')
    expect(result.image_url).toBeNull()
    expect(result.nutriscore).toBeNull()
    expect(result.ingredients).toBeNull()
    expect(result.nova_group).toBeNull()
    expect(result.eco_score).toBeNull()
  })

  test('detects baby_milk category from tags', () => {
    const result = transformOFFProduct({
      _id: '200',
      product_name: 'Infant Formula',
      categories_tags: ['en:infant-milk'],
    })
    expect(result.category).toBe('baby_milk')
  })

  test('detects baby_cereal category from tags', () => {
    const result = transformOFFProduct({
      _id: '300',
      product_name: 'Baby Cereal',
      categories_tags: ['en:baby-cereals'],
    })
    expect(result.category).toBe('baby_cereal')
  })
})

describe('searchBabyProducts', () => {
  test('returns empty array for short query', async () => {
    const result = await searchBabyProducts('a')
    expect(result).toEqual([])
  })

  test('returns empty array for null/empty query', async () => {
    expect(await searchBabyProducts(null)).toEqual([])
    expect(await searchBabyProducts('')).toEqual([])
  })
})

describe('getBabyProductDetails', () => {
  test('returns null for null barcode', async () => {
    const result = await getBabyProductDetails(null)
    expect(result).toBeNull()
  })
})
