import ElementPlus, { ElDialog } 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,
  getPlatformExportTask,
  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'
import AppDialog from '@/shared/components/AppDialog.vue'
import { ApiResponseError } from '@/shared/api/http'

vi.mock('@/modules/downloads/api/platformExportTasks', () => ({
  downloadPlatformExportTask: vi.fn(),
  getPlatformExportTask: 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, attemptCount: 1, maxAttempts: 3, nextRetryAt: 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()
    document.body.innerHTML = ''
    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(getPlatformExportTask).mockResolvedValue(task)
    vi.mocked(retryPlatformExportTask).mockResolvedValue({ ...task, status: 'PENDING' })
  })

  const dialogButton = (label: string) => {
    const found = Array.from(document.querySelectorAll<HTMLButtonElement>('.el-dialog__footer button')).find(button => button.textContent?.trim() === label)
    expect(found, label).toBeDefined(); return found!
  }
  const factValue = (label: string) => {
    const term = Array.from(document.querySelectorAll('[aria-label="下载任务资料"] dt')).find(node => node.textContent === label)
    expect(term, label).toBeDefined(); return term!.nextElementSibling!.textContent
  }
  async function openTask(value: PlatformExportTask = task) {
    vi.mocked(listPlatformExportTasks).mockResolvedValue({ records: [value], total: 1, page: 1, size: 20, pages: 1 })
    const wrapper = mount(DownloadCenterView, { attachTo: document.body, global: { plugins: [ElementPlus] } }); await flushPromises()
    const open = () => Array.from(document.querySelectorAll<HTMLButtonElement>('.el-table__body .table-actions button')).find(button => button.textContent?.trim() === '详情')!.click()
    open(); await flushPromises(); return { wrapper, open }
  }

  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('.data-table')?.textContent).not.toContain('失败原因')
    expect(document.querySelector('.data-table')?.textContent).toContain('格式')
    expect(document.querySelector('.data-table')?.textContent).toContain('完成时间')
    expect(document.querySelector('.data-table')?.textContent).toContain('过期时间')
    expect(document.querySelector('.failure-cell')).toBeNull()
    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()
    expect(HTMLAnchorElement.prototype.click).toHaveBeenCalledOnce()
    const clickedAnchor = vi.mocked(HTMLAnchorElement.prototype.click).mock.instances[0] as HTMLAnchorElement
    expect(clickedAnchor.download).toBe('客户列表.xlsx')
    await new Promise((resolve) => window.setTimeout(resolve, 0))
    expect(URL.revokeObjectURL).toHaveBeenCalledWith('blob:export')
  })

  it('shows retry 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')).toBeNull()
    const button = [...document.querySelectorAll<HTMLButtonElement>('button')].find((item) => item.textContent?.trim() === '重试')
    button?.click()
    await flushPromises()
    expect(retryPlatformExportTask).toHaveBeenCalledWith('9')
  })

  it('shows waiting retry and allows an immediate retry during automatic backoff', async () => {
    vi.mocked(listPlatformExportTasks).mockResolvedValue({
      records: [{ ...task, status: 'PENDING', processedRows: 0, failureMessage: '头程服务查询失败', attemptCount: 2, nextRetryAt: '2026-09-03T10:34:28' }],
      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.body.textContent).toContain('等待重试')
    const retry = [...document.querySelectorAll<HTMLButtonElement>('button')]
      .find((item) => item.textContent?.trim() === '立即重试')
    retry?.click()
    await flushPromises()
    expect(retryPlatformExportTask).toHaveBeenCalledWith('9')
  })

  it('labels and retries Finance tasks with their exact source export permission', async () => {
    const financeTask = {
      ...task,
      exportType: 'FINANCE_RECONCILIATION_STATEMENT_LIST',
      taskName: '客户对账单',
      status: 'FAILED' as const,
    }
    vi.mocked(listPlatformExportTasks).mockResolvedValue({ records: [financeTask], page: 1, size: 20, total: 1, pages: 1 })
    const pinia = setActivePinia(createPinia())
    const auth = useAuthStore()
    auth.token = 'token'
    auth.permissions = ['platform:download:list', 'platform:finance:customer-statement:export']
    useAccessPreviewStore().initializeAfterLogin()
    mount(DownloadCenterView, { attachTo: document.body, global: { plugins: [pinia, ElementPlus] } })
    await flushPromises()

    expect(document.body.textContent).toContain('客户对账单')
    const retry = [...document.querySelectorAll<HTMLButtonElement>('button')]
      .find((item) => item.textContent?.trim() === '重试')
    retry?.click()
    await flushPromises()
    expect(retryPlatformExportTask).toHaveBeenCalledWith('9')
  })

  it('loads a fresh task detail from the backend', async () => {
    const wrapper = mount(DownloadCenterView, { attachTo: document.body, global: { plugins: [createPinia(), ElementPlus] } })
    await flushPromises()

    const button = [...document.querySelectorAll<HTMLButtonElement>('button')]
      .find((item) => item.textContent?.trim() === '详情')
    button?.click()
    await flushPromises()

    expect(getPlatformExportTask).toHaveBeenCalledWith('9')
    expect(document.body.textContent).toContain('任务详情 · EXP9')
    expect(document.body.textContent).toContain('客户列表.xlsx')
    expect(document.querySelector('.el-drawer')).toBeNull()
    expect(document.querySelector('.el-dialog.admin-density-dialog')).not.toBeNull()
    expect(document.querySelectorAll('.task-detail-grid.density-fields > div')).toHaveLength(11)
    const detailDownload = [...document.querySelectorAll<HTMLButtonElement>('button')]
      .find((item) => item.textContent?.trim() === '下载文件')
    detailDownload?.click()
    await flushPromises()
    expect(downloadPlatformExportTask).toHaveBeenCalledWith('9')
    wrapper.unmount()
  })

  it('renders an actionable list error and can recover', async () => {
    vi.mocked(listPlatformExportTasks)
      .mockRejectedValueOnce(new Error('network down'))
      .mockResolvedValueOnce({ records: [task], page: 1, size: 20, total: 1, pages: 1 })
    mount(DownloadCenterView, { attachTo: document.body, global: { plugins: [createPinia(), ElementPlus] } })
    await flushPromises()

    expect(document.querySelector('[role="alert"]')?.textContent).toContain('下载任务暂时无法加载')
    const reload = [...document.querySelectorAll<HTMLButtonElement>('button')]
      .find((item) => item.textContent?.trim() === '重新加载')
    reload?.click()
    await flushPromises()

    expect(listPlatformExportTasks).toHaveBeenCalledTimes(2)
    expect(document.body.textContent).toContain('共 1 个任务')
  })

  it('shows a clear empty state and hides retry without the source export permission', async () => {
    vi.mocked(listPlatformExportTasks).mockResolvedValue({ records: [], page: 1, size: 20, total: 0, pages: 0 })
    const pinia = setActivePinia(createPinia())
    const auth = useAuthStore()
    auth.token = 'token'
    auth.permissions = ['platform:download:list']
    useAccessPreviewStore().initializeAfterLogin()
    mount(DownloadCenterView, { attachTo: document.body, global: { plugins: [pinia, ElementPlus] } })
    await flushPromises()

    expect(document.body.textContent).toContain('暂无符合筛选条件的下载任务')
    expect([...document.querySelectorAll<HTMLButtonElement>('button')]
      .some((item) => item.textContent?.trim() === '重试')).toBe(false)
  })

  it('keeps failure details out of the list and does not expose retry without 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']
    useAccessPreviewStore().initializeAfterLogin()
    vi.mocked(getPlatformExportTask).mockResolvedValue({ ...task, status: 'FAILED', failureMessage: 'IAM timeout' })
    mount(DownloadCenterView, { attachTo: document.body, global: { plugins: [pinia, ElementPlus] } })
    await flushPromises()

    expect(document.body.textContent).not.toContain('IAM timeout')
    expect([...document.querySelectorAll<HTMLButtonElement>('button')]
      .some((item) => item.textContent?.trim() === '重试')).toBe(false)

    ;[...document.querySelectorAll<HTMLButtonElement>('button')]
      .find((item) => item.textContent?.trim() === '详情')?.click()
    await flushPromises()
    expect(document.body.textContent).toContain('IAM timeout')
  })

  it('announces the initial loading state while the task request is pending', async () => {
    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] } })
    await wrapper.vm.$nextTick()

    expect(wrapper.find('.el-table').attributes('aria-busy')).toBe('true')
    resolveRequest({ records: [], page: 1, size: 20, total: 0, pages: 0 })
    await flushPromises()
    expect(wrapper.find('.el-table').attributes('aria-busy')).toBe('false')
  })

  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)
  })

  it('keeps the last successful task list and continues polling after a background refresh failure', async () => {
    vi.useFakeTimers()
    vi.mocked(listPlatformExportTasks)
      .mockResolvedValueOnce({ records: [{ ...task, status: 'RUNNING', processedRows: 3 }], page: 1, size: 20, total: 1, pages: 1 })
      .mockRejectedValueOnce(new Error('temporary network failure'))
      .mockResolvedValueOnce({ records: [{ ...task, status: 'SUCCEEDED', processedRows: 12 }], page: 1, size: 20, total: 1, pages: 1 })
    mount(DownloadCenterView, { attachTo: document.body, global: { plugins: [createPinia(), ElementPlus] } })
    await flushPromises()

    await vi.advanceTimersByTimeAsync(5000)
    await flushPromises()
    expect(document.body.textContent).toContain('自动刷新暂时失败')
    expect(document.body.textContent).toContain('客户列表')

    await vi.advanceTimersByTimeAsync(5000)
    await flushPromises()
    expect(listPlatformExportTasks).toHaveBeenCalledTimes(3)
    expect(document.body.textContent).not.toContain('自动刷新暂时失败')
  })

  it('updates an open task detail from the latest polling result', async () => {
    vi.useFakeTimers()
    vi.mocked(listPlatformExportTasks)
      .mockResolvedValueOnce({ records: [{ ...task, status: 'RUNNING', processedRows: 3 }], page: 1, size: 20, total: 1, pages: 1 })
      .mockResolvedValueOnce({ records: [{ ...task, status: 'SUCCEEDED', processedRows: 12 }], page: 1, size: 20, total: 1, pages: 1 })
    vi.mocked(getPlatformExportTask).mockResolvedValue({ ...task, status: 'RUNNING', processedRows: 3 })
    mount(DownloadCenterView, { attachTo: document.body, global: { plugins: [createPinia(), ElementPlus] } })
    await flushPromises()
    ;[...document.querySelectorAll<HTMLButtonElement>('button')]
      .find((item) => item.textContent?.trim() === '详情')?.click()
    await flushPromises()
    expect(document.body.textContent).toContain('3 / 12 行')

    await vi.advanceTimersByTimeAsync(5000)
    await flushPromises()
    expect(document.body.textContent).toContain('12 / 12 行')
  })

  it('keeps long facts and zero values complete through fullscreen and never uses a requester ID fallback', async () => {
    const value: PlatformExportTask = { ...task, id: '9223372036854775807', requestedBy: '9223372036854775806', requestedUsername: null, taskNo: 'EXP-FULL-001', taskName: '完整导出任务名称'.repeat(25), fileName: '完整导出文件名称'.repeat(25) + '.xlsx', processedRows: 0, totalRows: 0, sizeBytes: 0 }
    vi.mocked(getPlatformExportTask).mockResolvedValue(value)
    const { wrapper } = await openTask(value)
    const dialog = wrapper.findComponent(AppDialog)
    expect(dialog.props()).toMatchObject({ title: '任务详情 · EXP-FULL-001', width: 'min(720px, calc(100vw - 28px))', fullscreenable: true, showConfirm: false })
    expect(document.querySelector('[aria-label="下载任务资料"]')?.textContent).toContain(value.taskName)
    expect(factValue('文件名称')).toBe(value.fileName)
    expect(factValue('申请人')).toBe('—')
    expect(factValue('处理数据')).toBe('0 / 0 行')
    expect(factValue('文件大小')).toBe('0 B')
    expect(document.body.textContent).not.toContain(value.requestedBy)
    expect(document.body.textContent).not.toContain(value.id)
    document.querySelector<HTMLButtonElement>('[aria-label="展开全屏"]')!.click(); await flushPromises()
    expect(dialog.findComponent(ElDialog).props('fullscreen')).toBe(true)
    expect(factValue('文件名称')).toBe(value.fileName)
    dialogButton('下载文件').click(); await flushPromises()
    expect(downloadPlatformExportTask).toHaveBeenCalledWith(value.id)
  })

  it.each([
    ['RUNNING', '处理中', false], ['PENDING', '等待重试', true], ['EXPIRED', '已过期', false],
  ] as const)('shows %s facts and original retry/download eligibility', async (status,label,retry) => {
    const value: PlatformExportTask = { ...task, status, attemptCount: 2, processedRows: 3, totalRows: null, sizeBytes: null, fileName: null, nextRetryAt: '2026-10-20T12:00:00' }
    vi.mocked(getPlatformExportTask).mockResolvedValue(value)
    await openTask(value)
    expect(document.querySelector('.task-summary-heading')?.textContent).toContain(label)
    expect(factValue('处理数据')).toBe('3 行'); expect(factValue('文件大小')).toBe('—'); expect(factValue('文件名称')).toBe('—')
    expect(dialogButton('下载文件').disabled).toBe(true)
    if (retry) {
      expect(factValue('下次重试')).not.toBe('—')
      dialogButton('立即重试').click(); await flushPromises()
      expect(retryPlatformExportTask).toHaveBeenCalledWith(value.id)
    } else {
      expect(document.querySelector('.el-dialog__footer')?.textContent).not.toContain('重试')
      expect(factValue('下次重试')).toBe('—')
    }
  })

  it('preserves the full failure reason when retry fails and refreshes the same task after retry succeeds', async () => {
    const failed: PlatformExportTask = { ...task, status: 'FAILED', failureMessage: '完整失败原因'.repeat(90) }
    vi.mocked(getPlatformExportTask).mockResolvedValue(failed)
    vi.mocked(retryPlatformExportTask).mockRejectedValueOnce(new Error('重试失败')).mockResolvedValueOnce({ ...failed, status: 'PENDING' })
    await openTask(failed)
    expect(document.querySelector('.task-failure')?.textContent).toContain(failed.failureMessage)
    dialogButton('重试').click(); await flushPromises()
    expect(document.querySelector('.task-failure')?.textContent).toContain(failed.failureMessage)
    expect(dialogButton('重试').disabled).toBe(false)
    vi.mocked(listPlatformExportTasks).mockResolvedValue({ records: [{ ...failed, status: 'PENDING', attemptCount: 0, failureMessage: null }], total: 1, page: 1, size: 20, pages: 1 })
    dialogButton('重试').click(); await flushPromises()
    expect(retryPlatformExportTask).toHaveBeenCalledTimes(2)
    expect(document.querySelector('.task-summary-heading')?.textContent).toContain('等待处理')
    expect(document.querySelector('.task-failure')).toBeNull()
    expect(dialogButton('下载文件').disabled).toBe(true)
  })

  it('shows a compact detail error with diagnostics and restores actions only after reloading', async () => {
    vi.mocked(getPlatformExportTask).mockRejectedValueOnce(new ApiResponseError('详情读取失败', 'A0500', 500, null, 'req-download-detail')).mockResolvedValueOnce(task)
    await openTask()
    expect(document.querySelector('.el-dialog .load-error-state')?.textContent).toContain('req-download-detail')
    expect(document.querySelector('.el-dialog .load-error-state')?.classList.contains('is-compact')).toBe(true)
    expect(dialogButton('下载文件').disabled).toBe(true)
    const reload = Array.from(document.querySelectorAll<HTMLButtonElement>('.el-dialog button')).find(button => button.textContent?.trim() === '重新加载')!
    reload.click(); await flushPromises()
    expect(getPlatformExportTask).toHaveBeenCalledTimes(2)
    expect(document.querySelector('.el-dialog .load-error-state')).toBeNull()
    expect(dialogButton('下载文件').disabled).toBe(false)
  })

  it('keeps actions disabled while detail is loading and ignores an old response after close and reopen', async () => {
    let release!: (value: PlatformExportTask) => void
    vi.mocked(getPlatformExportTask).mockImplementationOnce(() => new Promise(resolve => { release = resolve })).mockResolvedValueOnce({ ...task, taskNo: 'EXP-NEW', taskName: '最新任务详情' })
    const { wrapper, open } = await openTask()
    expect(wrapper.findComponent(AppDialog).props('loading')).toBe(true)
    expect(dialogButton('下载文件').disabled).toBe(true)
    dialogButton('关闭').click(); await flushPromises()
    wrapper.findComponent(AppDialog).vm.$emit('closed'); await flushPromises()
    open(); await flushPromises()
    expect(wrapper.findComponent(AppDialog).props('title')).toBe('任务详情 · EXP-NEW')
    release({ ...task, taskName: '过期响应' }); await flushPromises()
    expect(document.querySelector('.task-summary-heading')?.textContent).toContain('最新任务详情')
    expect(document.querySelector('.task-summary-heading')?.textContent).not.toContain('过期响应')
    expect(wrapper.findComponent(AppDialog).props('loading')).toBe(false)
  })

  it('shows a missing business number as — without exposing the internal task ID', async () => {
    const value: PlatformExportTask = { ...task, id: '9223372036854775807', taskNo: '' }
    vi.mocked(getPlatformExportTask).mockResolvedValue(value)
    const { wrapper } = await openTask(value)
    expect(wrapper.findComponent(AppDialog).props('title')).toBe('任务详情')
    expect(factValue('任务编号')).toBe('—')
    expect(document.querySelector('.el-dialog')?.textContent).not.toContain(value.id)
  })

})