import { describe, it, expect, vi, beforeEach } from 'vitest'

const mockGetTariffs = vi.fn()
const mockPayloadFind = vi.fn()
const mockGetPayload = vi.fn(() => ({ find: mockPayloadFind }))

vi.mock('@/lib/ezy', () => ({ getTariffs: mockGetTariffs }))
vi.mock('payload', () => ({ getPayload: mockGetPayload }))
vi.mock('@payload-config', () => ({ default: {} }))

const ezyTariffs = [
  { id: 1, name: 'Дорослий', price: 250 },
  { id: 2, name: 'Дитячий', price: 150 },
]

const dbTariffs = [
  { ezy_id: 1, display_name: 'Дорослий (UA)', category_tag: 'adult', sort: 0 },
  { ezy_id: 2, display_name: 'Дитячий (UA)', category_tag: 'child', sort: 1 },
]

let GET: () => Promise<Response>

beforeEach(async () => {
  vi.resetModules()
  mockGetTariffs.mockReset()
  mockPayloadFind.mockReset()
  const mod = await import('@/app/api/tickets/tariffs/route')
  GET = mod.GET
})

describe('GET /api/tickets/tariffs', () => {
  it('returns merged tariffs sorted by sort field', async () => {
    mockGetTariffs.mockResolvedValueOnce(ezyTariffs)
    mockPayloadFind.mockResolvedValueOnce({ docs: dbTariffs })

    const res = await GET()
    expect(res.status).toBe(200)
    const { tariffs } = await res.json()
    expect(tariffs).toHaveLength(2)
    expect(tariffs[0].id).toBe(1)
    expect(tariffs[0].name).toBe('Дорослий (UA)')
    expect(tariffs[0].price).toBe(250)
  })

  it('filters out ezy tariffs with no matching DB record', async () => {
    mockGetTariffs.mockResolvedValueOnce([...ezyTariffs, { id: 99, name: 'Unknown', price: 0 }])
    mockPayloadFind.mockResolvedValueOnce({ docs: dbTariffs })

    const res = await GET()
    const { tariffs } = await res.json()
    expect(tariffs).toHaveLength(2)
    expect(tariffs.map((t: { id: number }) => t.id)).not.toContain(99)
  })

  it('uses db display_name over ezy name', async () => {
    mockGetTariffs.mockResolvedValueOnce([{ id: 1, name: 'EZY Name', price: 300 }])
    mockPayloadFind.mockResolvedValueOnce({
      docs: [{ ezy_id: 1, display_name: 'DB Name', sort: 0 }],
    })

    const res = await GET()
    const { tariffs } = await res.json()
    expect(tariffs[0].name).toBe('DB Name')
  })

  it('falls back to DB tariffs when ezy throws, with warning', async () => {
    mockGetTariffs.mockRejectedValueOnce(new Error('ezy down'))
    mockPayloadFind.mockResolvedValueOnce({
      docs: [
        {
          ezy_id: 1,
          display_name: 'Adult',
          last_synced_price: 250,
          last_synced_name: 'Adult',
          sort: 0,
        },
      ],
    })

    const res = await GET()
    expect(res.status).toBe(200)
    const json = await res.json()
    expect(json.warning).toMatch(/outdated/i)
    expect(json.tariffs[0].stale).toBe(true)
  })

  it('returns 503 when ezy fails and DB is empty', async () => {
    mockGetTariffs.mockRejectedValueOnce(new Error('ezy down'))
    mockPayloadFind.mockResolvedValueOnce({ docs: [] })

    const res = await GET()
    expect(res.status).toBe(503)
  })

  it('returns 503 when both ezy and DB fail', async () => {
    mockGetTariffs.mockRejectedValueOnce(new Error('ezy down'))
    mockPayloadFind.mockRejectedValueOnce(new Error('DB down'))

    const res = await GET()
    expect(res.status).toBe(503)
    const json = await res.json()
    expect(json.error).toBeDefined()
  })

  it('treats null sort as 0 for ordering purposes', async () => {
    mockGetTariffs.mockResolvedValueOnce([
      { id: 1, name: 'A', price: 100 },
      { id: 2, name: 'B', price: 200 },
    ])
    mockPayloadFind.mockResolvedValueOnce({
      docs: [
        { ezy_id: 2, display_name: 'B', sort: null },
        { ezy_id: 1, display_name: 'A', sort: 1 },
      ],
    })

    const res = await GET()
    const { tariffs } = await res.json()
    expect(tariffs[0].id).toBe(2) // null → 0, sorts before 1
    expect(tariffs[1].id).toBe(1)
  })

  it('falls back to ezy name when display_name is null', async () => {
    mockGetTariffs.mockResolvedValueOnce([{ id: 1, name: 'Ezy Name', price: 100 }])
    mockPayloadFind.mockResolvedValueOnce({
      docs: [{ ezy_id: 1, display_name: null, sort: 0 }],
    })

    const res = await GET()
    const { tariffs } = await res.json()
    expect(tariffs[0].name).toBe('Ezy Name')
  })

  it('includes categoryTag, description, image, and icon in merged response', async () => {
    mockGetTariffs.mockResolvedValueOnce([{ id: 1, name: 'Adult', price: 250 }])
    mockPayloadFind.mockResolvedValueOnce({
      docs: [
        {
          ezy_id: 1,
          display_name: 'Adult UA',
          category_tag: 'adult',
          description: 'Full-day pass',
          image: { url: '/img/adult.jpg' },
          icon: '🎿',
          sort: 0,
        },
      ],
    })

    const res = await GET()
    const { tariffs } = await res.json()
    expect(tariffs[0].categoryTag).toBe('adult')
    expect(tariffs[0].description).toBe('Full-day pass')
    expect(tariffs[0].image).toEqual({ url: '/img/adult.jpg' })
    expect(tariffs[0].icon).toBe('🎿')
  })

  it('fallback response uses last_synced_price and includes stale:true', async () => {
    mockGetTariffs.mockRejectedValueOnce(new Error('ezy down'))
    mockPayloadFind.mockResolvedValueOnce({
      docs: [
        {
          ezy_id: 3,
          display_name: 'Weekend',
          last_synced_name: 'Weekend pass',
          last_synced_price: 199,
          category_tag: 'weekend',
          description: null,
          image: null,
          icon: null,
          sort: 0,
        },
      ],
    })

    const res = await GET()
    const { tariffs } = await res.json()
    expect(tariffs[0].price).toBe(199)
    expect(tariffs[0].stale).toBe(true)
    expect(tariffs[0].id).toBe(3)
  })

  it('returns tariffs sorted in ascending sort order', async () => {
    mockGetTariffs.mockResolvedValueOnce([
      { id: 2, name: 'B', price: 100 },
      { id: 1, name: 'A', price: 200 },
    ])
    mockPayloadFind.mockResolvedValueOnce({
      docs: [
        { ezy_id: 1, display_name: 'A', sort: 0 },
        { ezy_id: 2, display_name: 'B', sort: 5 },
      ],
    })

    const res = await GET()
    const { tariffs } = await res.json()
    expect(tariffs[0].id).toBe(1)
    expect(tariffs[1].id).toBe(2)
  })
})