import { act, fireEvent, screen, waitFor, within } from '@testing-library/react'
import { Route, Routes, useLocation } from 'react-router-dom'
import { beforeEach, describe, expect, it, vi } from 'vitest'

import { apiPost } from '@/lib/api'
import { getHelpTitleIndex } from '@/lib/help'
import { tagsKeys, wikiKeys } from '@/lib/queryKeys'
import WikiDetailPage from '@/pages/wiki/WikiDetailPage'
import WikiNewPage from '@/pages/wiki/WikiNewPage'
import { buildTag, buildUser, buildWikiPage } from '@/test/factories'
import { renderWithProviders } from '@/test/render'

const wikiApi = vi.hoisted (() => ({
  fetchWikiPage:        vi.fn (),
  fetchWikiPageByTitle: vi.fn (),
  fetchWikiPages:       vi.fn (),
}))

const tagsApi = vi.hoisted (() => ({
  fetchTagByName: vi.fn (),
}))

const postsApi = vi.hoisted (() => ({
  fetchPosts: vi.fn (),
}))

vi.mock ('@/lib/wiki', () => ({
    ...wikiApi,
    fetchWikiAutolinkCandidates: async () => [],
    fetchWikiPageByReference: (reference: string, ...args: unknown[]) =>
	/^\d+$/.test (reference)
	? wikiApi.fetchWikiPage (reference, ...args)
	: wikiApi.fetchWikiPageByTitle (reference, ...args) }))
vi.mock ('@/lib/tags', () => tagsApi)
vi.mock ('@/lib/posts', () => postsApi)
vi.mock ('@/lib/help', () => ({ getHelpTitleIndex: vi.fn () }))
vi.mock ('@/lib/api', async importOriginal => ({
    ...await importOriginal<typeof import ('@/lib/api')> (), apiPost: vi.fn () }))
vi.mock ('@/components/ui/use-toast', () => ({ toast: vi.fn () }))
vi.mock ('react-markdown-editor-lite', () => ({
    default: ({ value, onChange }: {
	value: string
	onChange: (event: { text: string }) => void }) => (
	    <textarea aria-label="本文エディタ" value={value}
		onChange={event => onChange ({ text: event.target.value })}/>) }))


const Location = () => {
  const location = useLocation ()
  return <output data-testid="location">{location.pathname}{location.search}</output>
}


describe ('WikiDetailPage', () => {
  beforeEach (() => {
    wikiApi.fetchWikiPageByTitle.mockReset ().mockResolvedValue (null)
    wikiApi.fetchWikiPages.mockReset ().mockResolvedValue ([])
    tagsApi.fetchTagByName.mockReset ().mockResolvedValue (null)
    postsApi.fetchPosts.mockReset ().mockResolvedValue ({ posts: [], count: 0 })
    vi.mocked (getHelpTitleIndex).mockReset ().mockResolvedValue ({ })
    vi.mocked (apiPost).mockReset ()
  })

  it ('offers creation for an existing tag after the Help lookup completes', async () => {
    let finish!: (index: Record<string, string[]>) => void
    const pending = new Promise<Record<string, string[]>> (resolve => {
      finish = resolve
    })
    vi.mocked (getHelpTitleIndex).mockReturnValueOnce (pending)
    tagsApi.fetchTagByName.mockResolvedValue (buildTag ({ name: '既存タグ', hasWiki: false }))
    renderWithProviders (
	<Routes><Route path="/ja/wiki/:title" element={<WikiDetailPage/>}/></Routes>,
	{ route: `/ja/wiki/${ encodeURIComponent ('既存タグ') }` })
    await waitFor (() => expect (getHelpTitleIndex).toHaveBeenCalled ())
    expect (screen.queryByText ('404')).not.toBeInTheDocument ()
    expect (screen.queryByRole ('link', { name: '新規作成してください' }))
	.not.toBeInTheDocument ()
    await act (async () => finish ({ }))
    expect (await screen.findByRole ('link', { name: '新規作成してください' }))
	.toHaveAttribute ('href', `/ja/wiki/new?title=${ encodeURIComponent ('既存タグ') }`)
  })

  it ('creates a tag description through the existing form and displays its content', async () => {
    const page = buildWikiPage ({ title: '既存タグ', body: '説明文',
	resourceType: 'tag_description' })
    tagsApi.fetchTagByName.mockResolvedValue (buildTag ({ name: page.title, hasWiki: false }))
    vi.mocked (apiPost).mockResolvedValueOnce (page)
    const path = `/ja/wiki/${ encodeURIComponent (page.title) }`
    const { container, queryClient } = renderWithProviders (
	<>
	  <Location/>
	  <Routes>
	    <Route path="/ja/wiki/new" element={<WikiNewPage user={buildUser ({ role: 'member' })}/>}/>
	    <Route path="/ja/wiki/:title" element={<WikiDetailPage/>}/>
	  </Routes>
	</>, { route: path })
    fireEvent.click (await screen.findByRole ('link', { name: '新規作成してください' }))
    await screen.findByRole ('heading', { name: '新規 Wiki ページ' })
    expect (queryClient.getQueryData (wikiKeys.show (page.title, { }))).toBeNull ()
    queryClient.setQueryData (wikiKeys.index ({ }), [])
    wikiApi.fetchWikiPageByTitle.mockResolvedValue (page)
    wikiApi.fetchWikiPages.mockResolvedValue ([page])
    tagsApi.fetchTagByName.mockResolvedValue (buildTag ({ name: page.title, hasWiki: true }))
    expect (screen.getAllByRole ('textbox')[0]).toHaveValue (page.title)
    fireEvent.change (screen.getByRole ('textbox', { name: '本文エディタ' }), {
	target: { value: page.body } })
    fireEvent.click (screen.getByRole ('button', { name: '追加' }))
    await screen.findByRole ('heading', { name: page.title })
    expect (screen.getByTestId ('location')).toHaveTextContent (path)
    expect (screen.queryByRole ('textbox', { name: '本文エディタ' })).not.toBeInTheDocument ()
    expect (within (container.querySelector ('article')!).getByText (page.body))
	.toBeInTheDocument ()
    const form = vi.mocked (apiPost).mock.calls[0][1] as FormData
    expect (form.get ('title')).toBe (page.title)
    expect (form.get ('body')).toBe (page.body)
    expect (apiPost).toHaveBeenCalledWith ('/wiki', form,
	{ locale: 'ja', headers: { 'Content-Type': 'multipart/form-data' } })
    expect (screen.queryByText ('404')).not.toBeInTheDocument ()
    expect (queryClient.getQueryData (wikiKeys.show (page.title, { }))).toEqual (page)
    expect (queryClient.getQueryState (wikiKeys.index ({ }))?.isInvalidated).toBe (true)
    await waitFor (() => expect (queryClient.getQueryData (tagsKeys.show (page.title)))
	.toMatchObject ({ hasWiki: true }))
    expect (getHelpTitleIndex).toHaveBeenCalledTimes (1)
  })

  it ('keeps failed saves on the form without changing cached Wiki or tag state', async () => {
    const title = '既存タグ'
    const tag = buildTag ({ name: title, hasWiki: false })
    const path = `/ja/wiki/new?title=${ encodeURIComponent (title) }`
    vi.mocked (apiPost).mockRejectedValueOnce (new Error ('save failed'))
    const { queryClient } = renderWithProviders (
	<><Location/><WikiNewPage user={buildUser ({ role: 'member' })}/></>, { route: path })
    queryClient.setQueryData (wikiKeys.show (title, { }), null)
    queryClient.setQueryData (wikiKeys.index ({ }), [])
    queryClient.setQueryData (tagsKeys.show (title), tag)
    fireEvent.change (screen.getByRole ('textbox', { name: '本文エディタ' }), {
	target: { value: '保存しない本文' } })
    await act (async () => fireEvent.click (screen.getByRole ('button', { name: '追加' })))
    expect (apiPost).toHaveBeenCalledTimes (1)
    expect (screen.getByTestId ('location')).toHaveTextContent (path)
    expect (screen.getByRole ('heading', { name: '新規 Wiki ページ' })).toBeInTheDocument ()
    expect (queryClient.getQueryData (wikiKeys.show (title, { }))).toBeNull ()
    expect (queryClient.getQueryData (tagsKeys.show (title))).toEqual (tag)
    expect (queryClient.getQueryState (wikiKeys.index ({ }))?.isInvalidated).toBe (false)
  })

  it ('shows NotFound when neither a tag nor a Help title exists', async () => {
    renderWithProviders (
	<Routes><Route path="/ja/wiki/:title" element={<WikiDetailPage/>}/></Routes>,
	{ route: '/ja/wiki/missing' })
    expect (await screen.findByText ('404')).toBeInTheDocument ()
    expect (screen.queryByRole ('link', { name: '新規作成してください' }))
	.not.toBeInTheDocument ()
  })

  it.each (['403', '500', 'offline']) ('keeps Wiki error %s distinct from missing content',
      async message => {
	wikiApi.fetchWikiPageByTitle.mockRejectedValue (new Error (message))
	tagsApi.fetchTagByName.mockResolvedValue (buildTag ({ name: '既存タグ' }))
	renderWithProviders (
	    <Routes><Route path="/ja/wiki/:title" element={<WikiDetailPage/>}/></Routes>,
	    { route: `/ja/wiki/${ encodeURIComponent ('既存タグ') }` })
	expect (await screen.findByRole ('alert')).toHaveTextContent (message)
	expect (getHelpTitleIndex).not.toHaveBeenCalled ()
	expect (screen.queryByRole ('link', { name: '新規作成してください' }))
	    .not.toBeInTheDocument ()
      })

  it ('renders deprecated state outside the wiki title link', async () => {
    wikiApi.fetchWikiPageByTitle.mockResolvedValueOnce (buildWikiPage ({
      title:        '旧タグ',
      deprecatedAt: '2026-06-01T00:00:00.000Z',
    }))
    tagsApi.fetchTagByName.mockResolvedValueOnce (buildTag ({
      name:         '旧タグ',
      deprecatedAt: '2026-06-01T00:00:00.000Z',
    }))
    postsApi.fetchPosts.mockResolvedValueOnce ({ posts: [], count: 0 })

    renderWithProviders (
        <Routes>
          <Route path="/ja/wiki/:title" element={<WikiDetailPage/>}/>
        </Routes>,
        { route: '/ja/wiki/%E6%97%A7%E3%82%BF%E3%82%B0' },
    )

    const marker = await screen.findByText ('（廃止）')
    const heading = marker.closest ('h1')
    const link = screen.getByRole ('link', { name: '旧タグ' })

    expect (heading).not.toBeNull ()
    expect (heading!).toHaveTextContent ('旧タグ（廃止）')
    expect (link).toBeInTheDocument ()
    expect (marker.closest ('a')).toBeNull ()
  })
})