import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
import { createApp, type App } from 'vue'
import { useVersionOpen } from '../app/composables/useVersionOpen'

let app: App
let host: HTMLDivElement
const apiJson = vi.fn()
const replace = vi.fn()
const close = vi.fn()
let tab: { opener: unknown; closed: boolean; location: { replace: typeof replace }; close: typeof close }

function mount() {
  let result!: ReturnType<typeof useVersionOpen>
  host = document.createElement('div')
  document.body.append(host)
  app = createApp({ setup() { result = useVersionOpen(); return () => null } })
  app.mount(host)
  return result
}

beforeEach(() => {
  vi.useFakeTimers()
  vi.stubGlobal('useApi', () => ({ apiJson }))
  tab = { opener: {}, closed: false, location: { replace }, close }
  vi.spyOn(window, 'open').mockReturnValue(tab as unknown as Window)
})
afterEach(() => {
  app?.unmount()
  host?.remove()
  vi.restoreAllMocks()
  vi.unstubAllGlobals()
  vi.clearAllMocks()
  vi.useRealTimers()
})

describe('version open lifecycle', () => {
  it('reserves PDF tab synchronously, navigates after auth, leaves completed PDF open on unmount', async () => {
    let resolve!: (value: unknown) => void
    apiJson.mockReturnValue(new Promise(r => { resolve = r }))
    const state = mount()
    const pending = state.openVersion('d', 'v', 'pdf')
    expect(window.open).toHaveBeenCalledWith('about:blank', '_blank')
    expect(tab.opener).toBeNull()
    expect(state.openingVersionId.value).toBe('v')
    resolve({ url: 'https://files.example/v.pdf' })
    await pending
    expect(replace).toHaveBeenCalledWith('https://files.example/v.pdf')
    expect(state.fallbackUrl.value).toBe('https://files.example/v.pdf')
    app.unmount()
    expect(close).not.toHaveBeenCalled()
  })
  it('keeps a fallback when popup is blocked', async () => {
    vi.mocked(window.open).mockReturnValue(null)
    apiJson.mockResolvedValue({ url: 'https://files.example/v.pdf' })
    const state = mount()
    await state.openVersion('d', 'v', 'pdf')
    expect(state.openNotice.value).toBeTruthy()
    expect(state.fallbackUrl.value).toBe('https://files.example/v.pdf')
  })
  it('closes pending tab immediately on reset and ignores a late response', async () => {
    let resolve!: (value: unknown) => void
    apiJson.mockReturnValue(new Promise(r => { resolve = r }))
    const state = mount()
    const pending = state.openVersion('d', 'v', 'pdf')
    state.resetOpen()
    expect(close).toHaveBeenCalledTimes(1)
    resolve({ url: 'https://files.example/v.pdf' })
    await pending
    expect(replace).not.toHaveBeenCalled()
    expect(state.fallbackUrl.value).toBeNull()
  })
  it('closes reserved tab and reports request failure', async () => {
    apiJson.mockRejectedValue(new Error('offline'))
    const state = mount()
    await state.openVersion('d', 'v', 'pdf')
    expect(close).toHaveBeenCalled()
    expect(state.downloadError.value).toBe('offline')
    expect(state.openingVersionId.value).toBeNull()
  })
  it('handles synchronous popup errors and restores controls', async () => {
    vi.mocked(window.open).mockImplementation(() => { throw new Error('popup error') })
    const state = mount()
    await state.openVersion('d', 'v', 'pdf')
    expect(state.downloadError.value).toBe('popup error')
    expect(state.openingVersionId.value).toBeNull()
  })
  it('offers Word fallback after timeout and removes listeners on unmount', async () => {
    const assign = vi.spyOn(window.location, 'assign').mockImplementation(() => {})
    const remove = vi.spyOn(window, 'removeEventListener')
    vi.spyOn(HTMLAnchorElement.prototype, 'click').mockImplementation(() => {}) // กัน auto-download click จริง
    apiJson.mockResolvedValue({ url: 'https://files.example/v.docx?signature=a%2Fb' })
    const state = mount()
    await state.openVersion('d', 'v')
    expect(assign).toHaveBeenCalledWith('ms-word:ofe|u|https://files.example/v.docx?signature=a%2Fb')
    vi.advanceTimersByTime(3000)
    expect(state.openNotice.value).toBeTruthy()
    expect(state.fallbackUrl.value).toBeTruthy()
    app.unmount()
    expect(remove).toHaveBeenCalledWith('blur', expect.any(Function))
  })
  it('openDocxUrl opens a URL the caller already holds (ไฟล์ร่าง FR-16) without extra request', async () => {
    const assign = vi.spyOn(window.location, 'assign').mockImplementation(() => {})
    vi.spyOn(HTMLAnchorElement.prototype, 'click').mockImplementation(() => {})
    const state = mount()
    state.openDocxUrl('https://files.example/draft.docx?sig=a%2Fb')
    expect(apiJson).not.toHaveBeenCalled()
    expect(assign).toHaveBeenCalledWith('ms-word:ofe|u|https://files.example/draft.docx?sig=a%2Fb')
    expect(state.fallbackUrl.value).toBe('https://files.example/draft.docx?sig=a%2Fb')
    vi.advanceTimersByTime(3000)
    expect(state.openNotice.value).toBeTruthy()
  })
  it('auto-downloads the file to Downloads when Word did not take over within the wait window', () => {
    const assign = vi.spyOn(window.location, 'assign').mockImplementation(() => {})
    const saved: HTMLAnchorElement[] = []
    vi.spyOn(HTMLAnchorElement.prototype, 'click').mockImplementation(function clicked(this: HTMLAnchorElement) {
      saved.push(this)
    })
    const state = mount()
    state.openDocxUrl('https://files.example/draft.docx?sig=a%2Fb')
    // ยังไม่มีอะไรเกิดก่อนหมดเวลารอ
    vi.advanceTimersByTime(2999)
    expect(saved).toHaveLength(0)
    expect(state.openNotice.value).toBeNull()
    // ครบหน้าต่างรอ (ไม่มีการ blur = Word ไม่ได้เปิด) → เซฟไฟล์ให้อัตโนมัติ + แจ้งเหตุผล
    vi.advanceTimersByTime(1)
    expect(saved).toHaveLength(1)
    expect(saved[0].href).toBe('https://files.example/draft.docx?sig=a%2Fb')
    expect(state.openNotice.value).toContain('Downloads')
  })
  it('does not auto-download when the app switch was detected (Word เปิดจริง)', async () => {
    const assign = vi.spyOn(window.location, 'assign').mockImplementation(() => {})
    const saved: HTMLAnchorElement[] = []
    vi.spyOn(HTMLAnchorElement.prototype, 'click').mockImplementation(function clicked(this: HTMLAnchorElement) {
      saved.push(this)
    })
    const state = mount()
    state.openDocxUrl('https://files.example/draft.docx?sig=a%2Fb')
    window.dispatchEvent(new Event('blur')) // ผู้ใช้สลับไป Word
    vi.advanceTimersByTime(3000)
    expect(saved).toHaveLength(0)
    expect(state.openNotice.value).toBeNull()
  })
  it('re-click cancels the pending auto-download — only the latest URL is saved once', () => {
    const assign = vi.spyOn(window.location, 'assign').mockImplementation(() => {})
    const saved: HTMLAnchorElement[] = []
    vi.spyOn(HTMLAnchorElement.prototype, 'click').mockImplementation(function clicked(this: HTMLAnchorElement) {
      saved.push(this)
    })
    const state = mount()
    state.openDocxUrl('https://files.example/first.docx')
    vi.advanceTimersByTime(2000)
    state.openDocxUrl('https://files.example/second.docx') // resetOpen ยกเลิก timer อันเก่า
    vi.advanceTimersByTime(3000)
    expect(saved).toHaveLength(1)
    expect(saved[0].href).toBe('https://files.example/second.docx')
  })
})