import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
import {
  normalizeShopDomain,
  exchangeAccessToken,
  shopifyGraphQL,
  listOrdersPage,
  isRevokedCredentialsError,
  ShopifyApiError,
  SHOPIFY_API_VERSION,
  SHOPIFY_PAGE_SIZE,
  type ShopifyCredentials,
  type ShopifySession,
} from '../lib/api-client'

const CREDS: ShopifyCredentials = {
  shopDomain: 'minbutik.myshopify.com',
  clientId: 'client-id',
  clientSecret: 'client-secret',
}
const SESSION: ShopifySession = {
  shopDomain: 'minbutik.myshopify.com',
  accessToken: 'token-1',
}

function jsonResponse(body: unknown, status = 200): Response {
  return new Response(JSON.stringify(body), {
    status,
    headers: { 'Content-Type': 'application/json' },
  })
}

const fetchMock = vi.fn()

beforeEach(() => {
  vi.clearAllMocks()
  vi.stubGlobal('fetch', fetchMock)
})

afterEach(() => {
  vi.unstubAllGlobals()
})

describe('normalizeShopDomain', () => {
  it('accepts the full myshopify.com domain in any casing, with or without scheme', () => {
    expect(normalizeShopDomain('minbutik.myshopify.com')).toBe('minbutik.myshopify.com')
    expect(normalizeShopDomain('  MinButik.MyShopify.com  ')).toBe('minbutik.myshopify.com')
    expect(normalizeShopDomain('https://minbutik.myshopify.com')).toBe('minbutik.myshopify.com')
    expect(normalizeShopDomain('https://minbutik.myshopify.com/admin')).toBe(
      'minbutik.myshopify.com',
    )
  })

  it('expands a bare store handle', () => {
    expect(normalizeShopDomain('minbutik')).toBe('minbutik.myshopify.com')
  })

  it('accepts a pasted admin URL', () => {
    expect(normalizeShopDomain('https://admin.shopify.com/store/minbutik')).toBe(
      'minbutik.myshopify.com',
    )
    expect(normalizeShopDomain('admin.shopify.com/store/minbutik/settings/apps')).toBe(
      'minbutik.myshopify.com',
    )
  })

  it('rejects anything that is not a myshopify.com host (SSRF guard)', () => {
    expect(normalizeShopDomain('minbutik.se')).toBeNull()
    expect(normalizeShopDomain('192.168.1.1')).toBeNull()
    expect(normalizeShopDomain('https://evil.example.com/x.myshopify.com')).toBeNull()
    expect(normalizeShopDomain('sub.domain.myshopify.com')).toBeNull()
    expect(normalizeShopDomain('')).toBeNull()
    // A bare word expands to <word>.myshopify.com, which is Shopify-owned:
    // safe by construction, never a private host.
    expect(normalizeShopDomain('localhost')).toBe('localhost.myshopify.com')
  })
})

describe('exchangeAccessToken', () => {
  it('POSTs the client credentials grant and returns the token', async () => {
    fetchMock.mockResolvedValueOnce(
      jsonResponse({ access_token: 'token-1', expires_in: 86399 }),
    )
    await expect(exchangeAccessToken(CREDS)).resolves.toBe('token-1')

    const [url, init] = fetchMock.mock.calls[0]
    expect(url).toBe('https://minbutik.myshopify.com/admin/oauth/access_token')
    expect(JSON.parse((init as RequestInit).body as string)).toEqual({
      client_id: 'client-id',
      client_secret: 'client-secret',
      grant_type: 'client_credentials',
    })
  })

  it('classifies a non-retryable 4xx as revoked credentials', async () => {
    fetchMock.mockResolvedValueOnce(
      jsonResponse({ error: 'invalid_client' }, 400),
    )
    const error = await exchangeAccessToken(CREDS).catch((e) => e)
    expect(error).toBeInstanceOf(ShopifyApiError)
    expect(isRevokedCredentialsError(error)).toBe(true)
    expect((error as ShopifyApiError).code).toBe('invalid_client')
  })

  it('does NOT classify sustained throttling (429) as revoked credentials', async () => {
    // A persistent 429 that survives every retry is still throttling.
    // Classifying it as revoked would delete the stored credentials and force
    // the merchant to reconnect over a rate limit.
    fetchMock.mockResolvedValue(jsonResponse({}, 429))
    const error = await exchangeAccessToken(CREDS).catch((e) => e)
    expect(error).toBeInstanceOf(ShopifyApiError)
    expect((error as ShopifyApiError).status).toBe(429)
    expect(isRevokedCredentialsError(error)).toBe(false)
  }, 15_000)
})

describe('shopifyGraphQL', () => {
  it('sends the token header against the pinned API version and returns data', async () => {
    fetchMock.mockResolvedValueOnce(jsonResponse({ data: { shop: { name: 'Butiken' } } }))
    const data = await shopifyGraphQL<{ shop: { name: string } }>(SESSION, 'query { shop { name } }')
    expect(data.shop.name).toBe('Butiken')

    const [url, init] = fetchMock.mock.calls[0]
    expect(url).toBe(
      `https://minbutik.myshopify.com/admin/api/${SHOPIFY_API_VERSION}/graphql.json`,
    )
    expect((init as RequestInit).headers).toMatchObject({
      'X-Shopify-Access-Token': 'token-1',
    })
  })

  it('retries a THROTTLED response before surfacing data', async () => {
    fetchMock
      .mockResolvedValueOnce(
        jsonResponse({ errors: [{ message: 'Throttled', extensions: { code: 'THROTTLED' } }] }),
      )
      .mockResolvedValueOnce(jsonResponse({ data: { ok: true } }))
    await expect(shopifyGraphQL(SESSION, 'query { ok }')).resolves.toEqual({ ok: true })
    expect(fetchMock).toHaveBeenCalledTimes(2)
  }, 15_000)

  it('classifies ACCESS_DENIED as revoked (missing scope)', async () => {
    fetchMock.mockResolvedValueOnce(
      jsonResponse({
        errors: [{ message: 'Access denied', extensions: { code: 'ACCESS_DENIED' } }],
      }),
    )
    const error = await shopifyGraphQL(SESSION, 'query { orders }').catch((e) => e)
    expect(isRevokedCredentialsError(error)).toBe(true)
  })

  it('classifies HTTP 401 as revoked without retrying', async () => {
    fetchMock.mockResolvedValueOnce(jsonResponse({}, 401))
    const error = await shopifyGraphQL(SESSION, 'query { ok }').catch((e) => e)
    expect(isRevokedCredentialsError(error)).toBe(true)
    expect(fetchMock).toHaveBeenCalledTimes(1)
  })
})

describe('listOrdersPage', () => {
  it('passes the window filter and cursor and unwraps the connection', async () => {
    fetchMock.mockResolvedValueOnce(
      jsonResponse({
        data: {
          orders: {
            pageInfo: { hasNextPage: true, endCursor: 'cursor-2' },
            nodes: [{ legacyResourceId: '1042', name: '#1042' }],
          },
        },
      }),
    )
    const page = await listOrdersPage(SESSION, {
      updatedAtMin: '2026-05-01T00:00:00.000Z',
      after: 'cursor-1',
    })
    expect(page.hasNextPage).toBe(true)
    expect(page.endCursor).toBe('cursor-2')
    expect(page.orders).toHaveLength(1)

    const body = JSON.parse((fetchMock.mock.calls[0][1] as RequestInit).body as string)
    expect(body.variables).toEqual({
      first: SHOPIFY_PAGE_SIZE,
      after: 'cursor-1',
      query: "updated_at:>='2026-05-01T00:00:00.000Z'",
    })
  })
})