グカネータ作成 (#041) (#362)

Reviewed-on: #362 Co-authored-by: miteruzo <miteruzo@naver.com> Co-committed-by: miteruzo <miteruzo@naver.com>
2026-06-10 23:33:56 +09:00
@@ -33,6 +33,10 @@ npm run lint

 If either command cannot be run or fails, report the exact command and failure.

+Do not create, modify, or run tests unless the user explicitly asks for test
+work. When the user asks for tests, keep working and rerun them until they
+pass or the remaining failure is clearly blocked.
+
 ## TypeScript

 - TypeScript is strict. `tsconfig.app.json` enables `strict`,
@@ -18,6 +18,7 @@ import MaterialListPage from '@/pages/materials/MaterialListPage'
 import MaterialNewPage from '@/pages/materials/MaterialNewPage'
 // import MaterialSearchPage from '@/pages/materials/MaterialSearchPage'
 import MorePage from '@/pages/MorePage'
+import GekanatorPage from '@/pages/GekanatorPage'
 import NicoTagListPage from '@/pages/tags/NicoTagListPage'
 import NotFound from '@/pages/NotFound'
 import TOSPage from '@/pages/TOSPage.mdx'
@@ -39,7 +40,7 @@ import WikiHistoryPage from '@/pages/wiki/WikiHistoryPage'
 import WikiNewPage from '@/pages/wiki/WikiNewPage'
 import WikiSearchPage from '@/pages/wiki/WikiSearchPage'

-import type { Dispatch, FC, SetStateAction } from 'react'
+import type { Dispatch, FC, ReactNode, SetStateAction } from 'react'

 import type { User } from '@/types'

@@ -80,6 +81,10 @@ const RouteTransitionWrapper = ({ user, setUser }: {
 	  <Route path="/users/settings" element={<SettingPage user={user} setUser={setUser}/>}/>
 	  <Route path="/settings" element={<Navigate to="/users/settings" replace/>}/>
 	  <Route path="/tos" element={<TOSPage/>}/>
+	  <Route path="/gekanator" element={
+	      <AdminOnly user={user}>
+		<GekanatorPage/>
+	      </AdminOnly>}/>
 	  <Route path="/more" element={<MorePage/>}/>
 	  <Route path="*" element={<NotFound/>}/>
 	</Routes>
@@ -87,6 +92,16 @@ const RouteTransitionWrapper = ({ user, setUser }: {
 }


+const AdminOnly = ({ user, children }: {
+    user:      User | null
+    children:  ReactNode }) => {
+  if (user?.role !== 'admin')
+    return <NotFound/>
+
+  return <>{children}</>
+}
+
+
 const PostDetailRoute = ({ user }: { user: User | null }) => {
  const location = useLocation ()
  const key = location.pathname
@@ -0,0 +1,296 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+
+import { apiPost } from '@/lib/api'
+import {
+  expectedAnswerForQuestion,
+  restoreGekanatorQuestion,
+  saveGekanatorExtraQuestionAnswers,
+  saveGekanatorGame,
+  saveGekanatorQuestionSuggestion,
+} from '@/lib/gekanator'
+
+import type {
+  GekanatorAnswerLog,
+  StoredGekanatorQuestion,
+} from '@/lib/gekanator'
+import type { Post } from '@/types'
+
+vi.mock('@/lib/api', () => ({
+  apiGet: vi.fn(),
+  apiPost: vi.fn(),
+}))
+
+const mockedApiPost = vi.mocked(apiPost)
+
+const post = (overrides: Partial<Post> = {}): Post => ({
+  id: 1,
+  url: 'https://example.com/posts/1',
+  title: 'post title',
+  thumbnail: null,
+  thumbnailBase: null,
+  tags: [],
+  viewed: false,
+  related: [],
+  originalCreatedFrom: null,
+  originalCreatedBefore: null,
+  createdAt: '2026-06-10T00:00:00.000Z',
+  updatedAt: '2026-06-10T00:00:00.000Z',
+  uploadedUser: null,
+  ...overrides,
+})
+
+describe('expectedAnswerForQuestion', () => {
+  it('returns a direct example answer when present', () => {
+    const question: StoredGekanatorQuestion = {
+      id: 'post-similarity:10',
+      text: '喜多ちゃんが泣いてる?',
+      kind: 'post_similarity',
+      source: 'user_suggested',
+      priorityWeight: 1.2,
+      condition: {
+        type: 'post-similarity',
+        postId: 999,
+        answer: 'yes',
+        threshold: 0.65,
+      },
+      exampleAnswers: {
+        1: 'partial',
+      },
+    }
+
+    expect(expectedAnswerForQuestion(question, post({ id: 1 }))).toBe('partial')
+  })
+
+  it('returns the condition answer for the original post_similarity post', () => {
+    const question: StoredGekanatorQuestion = {
+      id: 'post-similarity:10',
+      text: '喜多ちゃんが泣いてる?',
+      kind: 'post_similarity',
+      source: 'user_suggested',
+      priorityWeight: 1.2,
+      condition: {
+        type: 'post-similarity',
+        postId: 123,
+        answer: 'probably_no',
+        threshold: 0.65,
+      },
+    }
+
+    expect(expectedAnswerForQuestion(question, post({ id: 123 }))).toBe('probably_no')
+  })
+
+  it('returns null for an unrelated post_similarity post without examples', () => {
+    const question: StoredGekanatorQuestion = {
+      id: 'post-similarity:10',
+      text: '喜多ちゃんが泣いてる?',
+      kind: 'post_similarity',
+      source: 'user_suggested',
+      priorityWeight: 1.2,
+      condition: {
+        type: 'post-similarity',
+        postId: 123,
+        answer: 'yes',
+        threshold: 0.65,
+      },
+    }
+
+    expect(expectedAnswerForQuestion(question, post({ id: 456 }))).toBeNull()
+  })
+
+  it('returns yes for a matching tag question', () => {
+    const question: StoredGekanatorQuestion = {
+      id: 'tag:character:喜多郁代',
+      text: '喜多ちゃんが関係してる?',
+      kind: 'tag',
+      condition: {
+        type: 'tag',
+        key: 'character:喜多郁代',
+      },
+    }
+
+    expect(
+      expectedAnswerForQuestion(
+        question,
+        post({
+          tags: [
+            {
+              id: 1,
+              name: '喜多郁代',
+              category: 'character',
+              aliases: [],
+              parents: [],
+              postCount: 1,
+              createdAt: '2026-06-10T00:00:00.000Z',
+              updatedAt: '2026-06-10T00:00:00.000Z',
+              hasWiki: false,
+              materialId: null,
+            },
+          ],
+        }),
+      ),
+    ).toBe('yes')
+  })
+
+  it('returns no for a non-matching tag question', () => {
+    const question: StoredGekanatorQuestion = {
+      id: 'tag:character:喜多郁代',
+      text: '喜多ちゃんが関係してる?',
+      kind: 'tag',
+      condition: {
+        type: 'tag',
+        key: 'character:喜多郁代',
+      },
+    }
+
+    expect(expectedAnswerForQuestion(question, post({ tags: [] }))).toBe('no')
+  })
+})
+
+describe('restoreGekanatorQuestion', () => {
+  it('uses default source and priority weight when omitted', () => {
+    const question = restoreGekanatorQuestion({
+      id: 'tag:character:喜多郁代',
+      text: '喜多ちゃんが関係してる?',
+      kind: 'tag',
+      condition: {
+        type: 'tag',
+        key: 'character:喜多郁代',
+      },
+    })
+
+    expect(question.source).toBe('default')
+    expect(question.priorityWeight).toBe(1)
+  })
+
+  it('tests a post_similarity question using direct examples', () => {
+    const question = restoreGekanatorQuestion({
+      id: 'post-similarity:10',
+      text: '喜多ちゃんが泣いてる?',
+      kind: 'post_similarity',
+      source: 'user_suggested',
+      priorityWeight: 1.2,
+      condition: {
+        type: 'post-similarity',
+        postId: 999,
+        answer: 'yes',
+        threshold: 0.65,
+      },
+      exampleAnswers: {
+        1: 'yes',
+        2: 'no',
+      },
+    })
+
+    expect(question.test(post({ id: 1 }))).toBe(true)
+    expect(question.test(post({ id: 2 }))).toBe(false)
+    expect(question.test(post({ id: 3 }))).toBe(false)
+  })
+})
+
+describe('Gekanator API writers', () => {
+  beforeEach(() => {
+    mockedApiPost.mockReset()
+  })
+
+  it('sends game results using snake_case request keys', async () => {
+    mockedApiPost.mockResolvedValue({ id: 100 })
+
+    const answers: GekanatorAnswerLog[] = [
+      {
+        questionId: 'tag:character:喜多郁代',
+        questionText: '喜多ちゃんが関係してる?',
+        questionCondition: {
+          type: 'tag',
+          key: 'character:喜多郁代',
+        },
+        answer: 'yes',
+        originalAnswer: 'partial',
+      },
+    ]
+
+    await expect(
+      saveGekanatorGame({
+        guessedPostId: 1,
+        correctPostId: 2,
+        answers,
+      }),
+    ).resolves.toEqual({ id: 100 })
+
+    expect(mockedApiPost).toHaveBeenCalledWith('/gekanator/games', {
+      guessed_post_id: 1,
+      correct_post_id: 2,
+      answers: [
+        {
+          question_id: 'tag:character:喜多郁代',
+          question_text: '喜多ちゃんが関係してる?',
+          question_condition: {
+            type: 'tag',
+            key: 'character:喜多郁代',
+          },
+          answer: 'yes',
+          original_answer: 'partial',
+        },
+      ],
+    })
+  })
+
+  it('sends question suggestions using snake_case request keys', async () => {
+    mockedApiPost.mockResolvedValue({
+      id: 10,
+      count: 1,
+    })
+
+    await expect(
+      saveGekanatorQuestionSuggestion({
+        gekanatorGameId: 100,
+        questionText: '喜多ちゃんが泣いてる?',
+        answer: 'yes',
+      }),
+    ).resolves.toEqual({
+      id: 10,
+      count: 1,
+    })
+
+    expect(mockedApiPost).toHaveBeenCalledWith('/gekanator/question_suggestions', {
+      gekanator_game_id: 100,
+      question_text: '喜多ちゃんが泣いてる?',
+      answer: 'yes',
+    })
+  })
+
+  it('sends extra question answers using snake_case request keys', async () => {
+    mockedApiPost.mockResolvedValue({
+      count: 2,
+    })
+
+    await saveGekanatorExtraQuestionAnswers({
+      gameId: 100,
+      answers: [
+        {
+          questionId: 10,
+          answer: 'yes',
+        },
+        {
+          questionId: 11,
+          answer: 'probably_no',
+        },
+      ],
+    })
+
+    expect(mockedApiPost).toHaveBeenCalledWith(
+      '/gekanator/games/100/extra_question_answers',
+      {
+        answers: [
+          {
+            question_id: 10,
+            answer: 'yes',
+          },
+          {
+            question_id: 11,
+            answer: 'probably_no',
+          },
+        ],
+      },
+    )
+  })
+})
@@ -0,0 +1,483 @@
+import { apiGet, apiPost } from '@/lib/api'
+
+import type { Post } from '@/types'
+
+export type GekanatorAnswerValue =
+    | 'yes'
+    | 'no'
+    | 'partial'
+    | 'probably_no'
+    | 'unknown'
+
+export type GekanatorAnswerLog = {
+    questionId:       string
+    questionText:     string
+    questionCondition?:  GekanatorQuestionCondition
+    answer:           GekanatorAnswerValue
+    originalAnswer:   GekanatorAnswerValue }
+
+export type GekanatorQuestionKind =
+    | 'tag'
+    | 'source'
+    | 'title'
+    | 'original_date'
+    | 'post_similarity'
+
+export type GekanatorQuestionSource =
+    | 'default'
+    | 'user_suggested'
+    | 'ai_generated'
+    | 'admin_curated'
+
+export type GekanatorQuestionCondition =
+    | { type: 'tag'; key: string }
+    | { type: 'source'; host: string }
+    | { type: 'original-year'; year: number }
+    | { type: 'original-month'; month: number }
+    | { type: 'original-month-day'; monthDay: string }
+    | { type: 'title-length-greater-than'; length: number }
+    | { type: 'title-has-ascii' }
+    | {
+	  type: 'post-similarity'
+	  postId: number
+	  answer: GekanatorAnswerValue
+	  threshold: number
+      }
+
+export type GekanatorExtraQuestion = {
+    id:              number
+    text:            string
+    source:          GekanatorQuestionSource
+    priorityWeight:  number }
+
+export type StoredGekanatorQuestion = {
+    id:              string
+    text:            string
+    kind:            GekanatorQuestionKind
+    condition:       GekanatorQuestionCondition
+    source?:         GekanatorQuestionSource
+    priorityWeight?: number
+    exampleAnswers?: Record<`${ number }`, GekanatorAnswerValue> }
+
+export type GekanatorQuestion = {
+    id:              string
+    text:            string
+    kind:            GekanatorQuestionKind
+    condition:       GekanatorQuestionCondition
+    source:          GekanatorQuestionSource
+    priorityWeight:  number
+    exampleAnswers?: Record<`${ number }`, GekanatorAnswerValue>
+    test:            (post: Post) => boolean }
+
+
+const directExampleAnswerFor = (
+    question:  StoredGekanatorQuestion,
+    post:      Post,
+): GekanatorAnswerValue | null => {
+  const direct = question.exampleAnswers?.[String (post.id) as `${ number }`]
+  if (direct)
+    return direct
+
+  if (question.condition.type === 'post-similarity' && question.condition.postId === post.id)
+    return question.condition.answer
+
+  return null
+}
+
+const countBy = <T extends string | number> (values: T[]): Map<T, number> => {
+  const counts = new Map<T, number> ()
+  values.forEach (value => counts.set (value, (counts.get (value) ?? 0) + 1))
+  return counts
+}
+
+
+const median = (values: number[]): number => {
+  const sorted = [...values].sort ((a, b) => a - b)
+  return sorted[Math.floor (sorted.length / 2)] ?? 0
+}
+
+
+const hostOf = (post: Post): string | null => {
+  try
+  {
+    return new URL (post.url).hostname.replace (/^www\./, '')
+  }
+  catch
+  {
+    return null
+  }
+}
+
+
+const originalYearOf = (post: Post): number | null => {
+  const value = post.originalCreatedFrom || post.originalCreatedBefore
+  if (!(value))
+    return null
+
+  const date = new Date (value)
+  if (Number.isNaN (date.getTime ()))
+    return null
+
+  return date.getFullYear ()
+}
+
+
+const originalDateOf = (post: Post): Date | null => {
+  const value = post.originalCreatedFrom || post.originalCreatedBefore
+  if (!(value))
+    return null
+
+  const date = new Date (value)
+  if (Number.isNaN (date.getTime ()))
+    return null
+
+  return date
+}
+
+
+const originalMonthOf = (post: Post): number | null => {
+  const date = originalDateOf (post)
+  if (!(date))
+    return null
+
+  return date.getMonth () + 1
+}
+
+
+const originalMonthDayOf = (post: Post): string | null => {
+  const date = originalDateOf (post)
+  if (!(date))
+    return null
+
+  return `${ date.getMonth () + 1 }-${ date.getDate () }`
+}
+
+
+const tagQuestionKey = ({ category, name }: { category: string; name: string }): string =>
+    `${ category }:${ name }`
+
+
+const tagFromQuestionKey = (key: string): { category: string; name: string } => {
+  const [category, ...rest] = key.split (':')
+  return { category: category ?? '', name: rest.join (':') }
+}
+
+
+const nicoTagLabel = (name: string): string => name.replace (/^nico:/, '')
+
+
+const tagQuestionText = (category: string, label: string): string => {
+  switch (category)
+  {
+  case 'deerjikist':
+    return `作者・ニジラーとして「${ label }」に関係してゐる?`
+  case 'meme':
+    return `元ネタ・ミームとして「${ label }」に関係しさう?`
+  case 'character':
+    return `「${ label }」といふキャラクターが関係してゐる?`
+  case 'material':
+    return `素材として「${ label }」に関係してゐる?`
+  case 'nico':
+    return `ニコニコに「${ label }」といふタグが付いてゐる?`
+  case 'general':
+  case 'meta':
+  default:
+    return `内容として「${ label }」に関係しさう?`
+  }
+}
+
+
+const questionableTag = (post: Post, key: string): boolean => {
+  const { category, name } = tagFromQuestionKey (key)
+
+  return (
+    post.tags.some (tag =>
+	tag.name === name
+	&& tag.category === category
+	&& !(tag.category === 'meta')
+	&& !(tag.name.includes ('タグ希望'))
+	&& !(tag.name.includes ('bot操作'))))
+}
+
+
+const questionMatches = (
+    post:       Post,
+    question:   StoredGekanatorQuestion,
+): boolean => {
+  const directAnswer = directExampleAnswerFor (question, post)
+  if (directAnswer)
+    return question.condition.type === 'post-similarity'
+	? directAnswer === question.condition.answer
+	: directAnswer === 'yes'
+
+  switch (question.condition.type)
+  {
+  case 'tag':
+    return questionableTag (post, question.condition.key)
+  case 'source':
+    return hostOf (post) === question.condition.host
+  case 'original-year':
+    return originalYearOf (post) === question.condition.year
+  case 'original-month':
+    return originalMonthOf (post) === question.condition.month
+  case 'original-month-day':
+    return originalMonthDayOf (post) === question.condition.monthDay
+  case 'title-length-greater-than':
+    return (post.title?.length ?? 0) > question.condition.length
+  case 'title-has-ascii':
+    return /[A-Za-z0-9]/.test (post.title ?? '')
+  case 'post-similarity':
+    return false
+  }
+}
+
+
+export const expectedAnswerForQuestion = (
+    question:  StoredGekanatorQuestion | GekanatorQuestion | undefined,
+    post:      Post | null,
+): GekanatorAnswerValue | null => {
+  if (!(question) || !(post))
+    return null
+
+  const directAnswer = directExampleAnswerFor (question, post)
+  if (directAnswer)
+    return directAnswer
+
+  switch (question.condition.type)
+  {
+  case 'tag':
+  case 'source':
+  case 'original-year':
+  case 'original-month':
+  case 'original-month-day':
+  case 'title-length-greater-than':
+  case 'title-has-ascii':
+    return questionMatches (post, question) ? 'yes' : 'no'
+  case 'post-similarity':
+    return null
+  }
+}
+
+
+export const restoreGekanatorQuestion = (
+    question:  StoredGekanatorQuestion,
+): GekanatorQuestion => ({
+  ...question,
+  source: question.source ?? 'default',
+  priorityWeight: question.priorityWeight ?? 1,
+  test: (post: Post) => questionMatches (post, question) })
+
+
+export const storeGekanatorQuestion = (
+    question:  GekanatorQuestion,
+): StoredGekanatorQuestion => ({
+  id: question.id,
+  text: question.text,
+  kind: question.kind,
+  condition: question.condition,
+  source: question.source,
+  priorityWeight: question.priorityWeight,
+  exampleAnswers: question.exampleAnswers })
+
+
+export const fetchGekanatorPosts = async (): Promise<Post[]> => {
+  const data = await apiGet<{ posts: Post[] }> ('/gekanator/posts')
+  return data.posts
+}
+
+
+export const fetchGekanatorQuestions = async (): Promise<StoredGekanatorQuestion[]> => {
+  const data = await apiGet<{ questions: StoredGekanatorQuestion[] }> ('/gekanator/questions')
+  return data.questions
+}
+
+
+export const fetchGekanatorExtraQuestions = async (
+    gameId: number,
+): Promise<GekanatorExtraQuestion[]> => {
+  const data = await apiGet<{ questions: GekanatorExtraQuestion[] }> (
+      `/gekanator/games/${ gameId }/extra_questions`)
+  return data.questions
+}
+
+
+export const buildGekanatorQuestions = (posts: Post[]): GekanatorQuestion[] => {
+  const tagCounts = countBy (posts.flatMap (post =>
+      post.tags
+      .filter (tag =>
+	  !(tag.category === 'meta')
+	  && !(tag.name.includes ('タグ希望'))
+	  && !(tag.name.includes ('bot操作')))
+      .map (tag => tagQuestionKey (tag))))
+  const hosts = countBy (posts.map (hostOf).filter ((host): host is string => Boolean (host)))
+  const originalYears = countBy (
+      posts
+      .map (originalYearOf)
+      .filter ((year): year is number => year !== null))
+  const originalMonths = countBy (
+      posts
+      .map (originalMonthOf)
+      .filter ((month): month is number => month !== null))
+  const originalMonthDays = countBy (
+      posts
+      .map (originalMonthDayOf)
+      .filter ((monthDay): monthDay is string => monthDay !== null))
+  const titleLengthMedian = median (posts.map (post => post.title?.length ?? 0))
+
+  const usefulEntries = <T extends string | number> (counts: Map<T, number>) =>
+      [...counts.entries ()]
+      .filter (([, count]) => count > 0 && count < posts.length)
+      .sort ((a, b) => Math.abs (posts.length / 2 - a[1])
+	       - Math.abs (posts.length / 2 - b[1]))
+      .slice (0, 80)
+
+  const tagQuestions = usefulEntries (tagCounts)
+      .filter (([, count]) => count >= 2 && count <= Math.max (2, posts.length * .7))
+      .slice (0, 80)
+      .map (([key]) => {
+	const { category, name } = tagFromQuestionKey (String (key))
+	const label = category === 'nico' ? nicoTagLabel (name) : name
+
+	return {
+	    id:   `tag:${ key }`,
+	    text: tagQuestionText (category, label),
+	    kind: 'tag' as const,
+	    condition: { type: 'tag' as const, key: String (key) },
+	    source: 'default' as const,
+	    priorityWeight: 1,
+	    test: (post: Post) => questionableTag (post, String (key)) }
+      })
+
+  const sourceQuestions = usefulEntries (hosts)
+      .filter (([, count]) => count >= 2 && count <= Math.max (2, posts.length * .7))
+      .slice (0, 20)
+      .map (([host]) => ({
+	  id:   `source:${ host }`,
+	  text: `${ host } の投稿を思ひ浮かべてゐる?`,
+	  kind: 'source' as const,
+	  condition: { type: 'source' as const, host },
+	  source: 'default' as const,
+	  priorityWeight: 1,
+	  test: (post: Post) => hostOf (post) === host }))
+
+  const originalYearQuestions = usefulEntries (originalYears)
+      .filter (([, count]) => count >= 2 && count <= Math.max (2, posts.length * .7))
+      .slice (0, 20)
+      .map (([year]) => ({
+	  id:   `original-year:${ year }`,
+	  text: `オリジナルの投稿年は ${ year } 年?`,
+	  kind: 'original_date' as const,
+	  condition: { type: 'original-year' as const, year },
+	  source: 'default' as const,
+	  priorityWeight: 1,
+	  test: (post: Post) => originalYearOf (post) === year }))
+
+  const originalMonthQuestions = usefulEntries (originalMonths)
+      .filter (([, count]) => count >= 2 && count <= Math.max (2, posts.length * .7))
+      .slice (0, 20)
+      .map (([month]) => ({
+	  id:   `original-month:${ month }`,
+	  text: `オリジナルの投稿月は ${ month } 月?`,
+	  kind: 'original_date' as const,
+	  condition: { type: 'original-month' as const, month },
+	  source: 'default' as const,
+	  priorityWeight: 1,
+	  test: (post: Post) => originalMonthOf (post) === month }))
+
+  const originalMonthDayQuestions = usefulEntries (originalMonthDays)
+      .filter (([, count]) => count >= 2 && count <= Math.max (2, posts.length * .7))
+      .slice (0, 20)
+      .map (([monthDay]) => {
+	const [month, day] = String (monthDay).split ('-')
+
+	return {
+	    id:   `original-month-day:${ monthDay }`,
+	    text: `オリジナルの投稿日は ${ month } 月 ${ day } 日?`,
+	    kind: 'original_date' as const,
+	    condition: { type: 'original-month-day' as const, monthDay: String (monthDay) },
+	    source: 'default' as const,
+	    priorityWeight: 1,
+	    test: (post: Post) => originalMonthDayOf (post) === monthDay }
+      })
+
+  const titleQuestions = [
+      {
+	  id:   'title:long',
+	  text: '題名が長めの投稿?',
+	  kind: 'title' as const,
+	  condition: {
+	      type: 'title-length-greater-than' as const,
+	      length: titleLengthMedian },
+	  source: 'default' as const,
+	  priorityWeight: 1,
+	  test: (post: Post) => (post.title?.length ?? 0) > titleLengthMedian },
+      {
+	  id:   'title:ascii',
+	  text: '題名に英数字が混じってゐる?',
+	  kind: 'title' as const,
+	  condition: { type: 'title-has-ascii' as const },
+	  source: 'default' as const,
+	  priorityWeight: 1,
+	  test: (post: Post) => /[A-Za-z0-9]/.test (post.title ?? '') }]
+      .filter (question => {
+	const yes = posts.filter (post => question.test (post)).length
+	const no = posts.length - yes
+	return yes >= 2 && no >= 2 && yes <= posts.length * .7 && no <= posts.length * .7
+      })
+
+  return [
+      ...sourceQuestions,
+      ...originalYearQuestions,
+      ...originalMonthQuestions,
+      ...originalMonthDayQuestions,
+      ...titleQuestions,
+      ...tagQuestions]
+}
+
+
+export const saveGekanatorGame = async ({
+    guessedPostId,
+    correctPostId,
+    answers,
+}: {
+    guessedPostId:  number
+    correctPostId:  number
+    answers:        GekanatorAnswerLog[]
+}): Promise<{ id: number }> =>
+    await apiPost ('/gekanator/games', {
+	guessed_post_id: guessedPostId,
+	correct_post_id: correctPostId,
+	answers: answers.map (answer => ({
+	    question_id: answer.questionId,
+	    question_text: answer.questionText,
+	    question_condition: answer.questionCondition ?? null,
+	    answer: answer.answer,
+	    original_answer: answer.originalAnswer })) })
+
+
+export const saveGekanatorQuestionSuggestion = async ({
+    gekanatorGameId,
+    questionText,
+    answer,
+}: {
+    gekanatorGameId:  number
+    questionText:     string
+    answer:           GekanatorAnswerValue
+}): Promise<{ id: number; count: number }> =>
+    await apiPost ('/gekanator/question_suggestions', {
+	gekanator_game_id: gekanatorGameId,
+	question_text: questionText,
+	answer })
+
+
+export const saveGekanatorExtraQuestionAnswers = async ({
+    gameId,
+    answers,
+}: {
+    gameId:   number
+    answers:  { questionId: number; answer: GekanatorAnswerValue }[]
+}) =>
+    await apiPost (`/gekanator/games/${ gameId }/extra_question_answers`, {
+	answers: answers.map (item => ({
+	    question_id: item.questionId,
+	    answer: item.answer })) })
@@ -8,6 +8,13 @@ export const postsKeys = {
    changes:  (p: { post?: string; tag?: string; page: number; limit: number }) =>
 		  ['posts', 'changes', p] as const }

+export const gekanatorKeys = {
+    root:      ['gekanator'] as const,
+    posts:     () => ['gekanator', 'posts'] as const,
+    questions: () => ['gekanator', 'questions'] as const,
+    extraQuestions: (gameId: number) =>
+		       ['gekanator', 'games', gameId, 'extra-questions'] as const }
+
 export const tagsKeys = {
    root:         ['tags'] as const,
    index:        (p: FetchTagsParams) => ['tags', 'index', p] as const,