import ElementPlus from 'element-plus'
import { createPinia, setActivePinia } from 'pinia'
import { enableAutoUnmount, flushPromises, mount } from '@vue/test-utils'
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
import {
  downloadPlatformExportTask,
  listPlatformExportTasks,
  retryPlatformExportTask,
  type PlatformExportTask,
} from '@/modules/downloads/api/platformExportTasks'
import { useAccessPreviewStore } from '@/core/access/accessPreview'
import { useAuthStore } from '@/core/auth/auth'
import DownloadCenterView from './DownloadCenterView.vue'

vi.mock('@/modules/downloads/api/platformExportTasks', () => ({
  downloadPlatformExportTask: vi.fn(),
  listPlatformExportTasks: vi.fn(),
  retryPlatformExportTask: vi.fn(),
}))

class ResizeObserverStub implements ResizeObserver {
  observe() {}
  unobserve() {}
  disconnect() {}
}

const task: PlatformExportTask = {
  id: '9', taskNo: 'EXP9', exportType: 'CUSTOMER_LIST', format: 'XLSX', taskName: '客户列表',
  status: 'SUCCEEDED', totalRows: 12, processedRows: 12, fileName: '客户列表.xlsx',
  contentType: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', sizeBytes: 2048,
  failureMessage: null, requestedBy: '1', requestedUsername: 'admin', requestedAt: '2026-08-03T10:00:00',
  startedAt: '2026-08-03T10:00:01', completedAt: '2026-08-03T10:00:02', expiresAt: '2026-08-10T10:00:02',
}

enableAutoUnmount(afterEach)
afterEach(() => vi.useRealTimers())

describe('DownloadCenterView', () => {
  beforeEach(() => {
    vi.clearAllMocks()
    vi.stubGlobal('ResizeObserver', ResizeObserverStub)
    Object.defineProperty(URL, 'createObjectURL', { configurable: true, value: vi.fn(() => 'blob:export') })
    Object.defineProperty(URL, 'revokeObjectURL', { configurable: true, value: vi.fn() })
    vi.spyOn(HTMLAnchorElement.prototype, 'click').mockImplementation(() => {})
    const pinia = createPinia()
    setActivePinia(pinia)
    const auth = useAuthStore()
    auth.token = 'token'
    auth.permissions = ['platform:download:list', 'platform:customer:export']
    useAccessPreviewStore().initializeAfterLogin()
    vi.mocked(listPlatformExportTasks).mockResolvedValue({ records: [task], page: 1, size: 20, total: 1, pages: 1 })
    vi.mocked(downloadPlatformExportTask).mockResolvedValue(new Blob(['xlsx']))
    vi.mocked(retryPlatformExportTask).mockResolvedValue({ ...task, status: 'PENDING' })
  })

  it('lists completed tasks and downloads the backend-generated artifact', async () => {
    const pinia = setActivePinia(createPinia())
    const auth = useAuthStore()
    auth.token = 'token'
    auth.permissions = ['platform:download:list', 'platform:customer:export']
    useAccessPreviewStore().initializeAfterLogin()
    mount(DownloadCenterView, { attachTo: document.body, global: { plugins: [pinia, ElementPlus] } })
    await flushPromises()

    expect(document.body.textContent).toContain('客户列表')
    expect(document.querySelector('.failure-cell')?.classList.contains('failure-message')).toBe(false)
    const button = [...document.querySelectorAll<HTMLButtonElement>('button')].find((item) => item.textContent?.trim() === '下载')
    button?.click()
    await flushPromises()

    expect(downloadPlatformExportTask).toHaveBeenCalledWith('9')
    expect(URL.createObjectURL).toHaveBeenCalled()
  })

  it('shows retry only for failed tasks with the source export permission', async () => {
    vi.mocked(listPlatformExportTasks).mockResolvedValue({ records: [{ ...task, status: 'FAILED', failureMessage: 'IAM timeout' }], page: 1, size: 20, total: 1, pages: 1 })
    const pinia = setActivePinia(createPinia())
    const auth = useAuthStore()
    auth.token = 'token'
    auth.permissions = ['platform:download:list', 'platform:customer:export']
    useAccessPreviewStore().initializeAfterLogin()
    mount(DownloadCenterView, { attachTo: document.body, global: { plugins: [pinia, ElementPlus] } })
    await flushPromises()

    expect(document.querySelector('.failure-cell')?.classList.contains('failure-message')).toBe(true)
    const button = [...document.querySelectorAll<HTMLButtonElement>('button')].find((item) => item.textContent?.trim() === '重试')
    button?.click()
    await flushPromises()
    expect(retryPlatformExportTask).toHaveBeenCalledWith('9')
  })

  it('does not schedule another refresh after an in-flight load finishes on an unmounted page', async () => {
    vi.useFakeTimers()
    let resolveRequest!: (value: { records: PlatformExportTask[]; page: number; size: number; total: number; pages: number }) => void
    vi.mocked(listPlatformExportTasks).mockReturnValue(new Promise((resolve) => { resolveRequest = resolve }))
    const wrapper = mount(DownloadCenterView, { global: { plugins: [createPinia(), ElementPlus] } })

    wrapper.unmount()
    resolveRequest({ records: [{ ...task, status: 'RUNNING' }], page: 1, size: 20, total: 1, pages: 1 })
    await flushPromises()
    await vi.advanceTimersByTimeAsync(5000)

    expect(listPlatformExportTasks).toHaveBeenCalledTimes(1)
  })
})