Add missing episodes feature: implement FindMissingEpisodes endpoint, update metadata providers to retrieve season episode counts, and enhance frontend components for displaying missing episodes report. Update translations for new UI elements.

frontend/src/features/admin/shows/ShowMetadataCard.tsx

@@ -1,10 +1,12 @@
 import { useMutation, useQuery } from '@tanstack/react-query'
-import { useState } from 'react'
+import { useEffect, useState } from 'react'
 import { useTranslation } from 'react-i18next'
+import { Loader2 } from 'lucide-react'
 import { HttpError } from '@/shared/api/client'
-import type { MetadataCandidate, ShowDto } from '@/shared/api/types'
+import type { MetadataCandidate, MissingEpisodesReport, ShowDto } from '@/shared/api/types'
 import { Button } from '@/shared/ui/button'
 import { Card, CardContent, CardHeader, CardTitle } from '@/shared/ui/card'
+import { Dialog, DialogContent, DialogHeader, DialogTitle } from '@/shared/ui/dialog'
 import { Input } from '@/shared/ui/input'
 import { Label } from '@/shared/ui/label'
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/shared/ui/select'
@@ -14,6 +16,7 @@ import { ImageGallery } from '@/features/admin/images/ImageGallery'
 import {
   applyMetadata,
   clearMetadata,
+  findMissingEpisodes,
   getMetadataProviders,
   refreshEpisodesMetadata,
   renameShow,
@@ -34,6 +37,14 @@ export function ShowMetadataCard({ show, onChanged }: { show: ShowDto; onChanged
   const [description, setDescription] = useState(show.description ?? '')
   const [year, setYear] = useState(show.year != null ? String(show.year) : '')
 
+  // После «Применить»/обновления с сервера показанные значения меняются — подхватываем их в поля формы
+  // (иначе описание/год оставались бы пустыми, хотя в БД уже записаны). Реагируем только на смену
+  // серверных значений, так что ручной ввод между сохранениями не затирается.
+  useEffect(() => {
+    setDescription(show.description ?? '')
+    setYear(show.year != null ? String(show.year) : '')
+  }, [show.description, show.year])
+
   const { data: providers } = useQuery({
     queryKey: ['admin', 'metadata', 'providers'],
     queryFn: getMetadataProviders,
@@ -110,11 +121,18 @@ export function ShowMetadataCard({ show, onChanged }: { show: ShowDto; onChanged
     },
     onError,
   })
+  const [missing, setMissing] = useState<MissingEpisodesReport | null>(null)
+  const findMissing = useMutation({
+    mutationFn: () => findMissingEpisodes(show.id),
+    onSuccess: (report) => setMissing(report),
+    onError,
+  })
 
   const linked =
     !!show.metadataExternalId && !!show.metadataProvider && show.metadataProvider !== 'manual'
 
   return (
+    <>
     <Card>
       <CardHeader>
         <CardTitle>{t('admin.metadata.title')}</CardTitle>
@@ -260,11 +278,23 @@ export function ShowMetadataCard({ show, onChanged }: { show: ShowDto; onChanged
                   disabled={refreshEpisodes.isPending}
                   onClick={() => refreshEpisodes.mutate()}
                 >
+                  {refreshEpisodes.isPending && <Loader2 className="h-4 w-4 animate-spin" />}
                   {refreshEpisodes.isPending
                     ? t('admin.metadata.refreshing')
                     : t('admin.metadata.refreshEpisodes')}
                 </Button>
               )}
+              {linked && (
+                <Button
+                  size="sm"
+                  variant="outline"
+                  disabled={findMissing.isPending}
+                  onClick={() => findMissing.mutate()}
+                >
+                  {findMissing.isPending && <Loader2 className="h-4 w-4 animate-spin" />}
+                  {t('admin.metadata.findMissing')}
+                </Button>
+              )}
               {(show.metadataProvider || show.posterImageId) && (
                 <Button
                   size="sm"
@@ -285,5 +315,50 @@ export function ShowMetadataCard({ show, onChanged }: { show: ShowDto; onChanged
         </div>
       </CardContent>
     </Card>
+
+    <Dialog open={missing != null} onOpenChange={(open) => !open && setMissing(null)}>
+      <DialogContent className="max-w-lg">
+        <DialogHeader>
+          <DialogTitle>{t('admin.metadata.missingTitle')}</DialogTitle>
+        </DialogHeader>
+        {missing && missing.seasons.length === 0 && (
+          <p className="text-sm text-muted-foreground">{t('admin.metadata.missingNoSeasons')}</p>
+        )}
+        {missing && missing.seasons.length > 0 && (
+          <div className="flex max-h-[60vh] flex-col gap-3 overflow-y-auto">
+            {missing.seasons.map((s) => (
+              <div key={s.season} className="rounded-md border border-border p-3 text-sm">
+                <div className="flex flex-wrap items-center gap-2">
+                  <span className="font-medium">
+                    {t('admin.metadata.seasonN', { n: s.season })}
+                  </span>
+                  <span className="text-xs text-muted-foreground">
+                    {t('admin.metadata.loadedOf', {
+                      loaded: s.loaded,
+                      total: s.expected ?? '?',
+                    })}
+                  </span>
+                </div>
+                {s.expected == null ? (
+                  <p className="mt-1 text-xs text-amber-500">
+                    {t('admin.metadata.missingUnknown')}
+                  </p>
+                ) : s.missing.length === 0 ? (
+                  <p className="mt-1 text-xs text-emerald-500">
+                    {t('admin.metadata.missingNone')}
+                  </p>
+                ) : (
+                  <p className="mt-1 text-muted-foreground">
+                    {t('admin.metadata.missingList')}:{' '}
+                    <span className="text-foreground">{s.missing.join(', ')}</span>
+                  </p>
+                )}
+              </div>
+            ))}
+          </div>
+        )}
+      </DialogContent>
+    </Dialog>
+    </>
   )
 }

frontend/src/features/admin/shows/api.ts

@@ -2,6 +2,7 @@ import { apiRequest } from '@/shared/api/client'
 import type {
   CreatedIdResponse,
   MetadataCandidate,
+  MissingEpisodesReport,
   ShowAudience,
   ShowDto,
   ShowKind,
@@ -94,3 +95,8 @@ export function setShowPoster(showId: string, imageId: string | null) {
 export function refreshEpisodesMetadata(showId: string) {
   return apiRequest<number>(`/admin/metadata/shows/${showId}/refresh-episodes`, { method: 'POST' })
 }
+
+/** Отчёт: каких серий не хватает в загруженных сезонах (по данным источника). */
+export function findMissingEpisodes(showId: string) {
+  return apiRequest<MissingEpisodesReport>(`/admin/metadata/shows/${showId}/missing-episodes`)
+}

frontend/src/shared/api/types.ts

@@ -96,6 +96,17 @@ export type MetadataCandidate = {
   posterUrl: string | null
 }
 
+export type SeasonGapDto = {
+  season: number
+  expected: number | null
+  loaded: number
+  missing: number[]
+}
+
+export type MissingEpisodesReport = {
+  seasons: SeasonGapDto[]
+}
+
 export type EpisodeDto = {
   id: string
   mediaAssetId: string

frontend/src/shared/lib/i18n.ts

@@ -380,6 +380,14 @@ const resources = {
           refreshEpisodes: 'Обновить серии',
           refreshing: 'Обновляем…',
           refreshedCount: 'Обновлено серий: {{count}}',
+          findMissing: 'Найти отсутствующие серии',
+          missingTitle: 'Отсутствующие серии',
+          missingNoSeasons: 'В шоу нет загруженных серий с распознанными номерами.',
+          seasonN: 'Сезон {{n}}',
+          loadedOf: 'загружено {{loaded}} из {{total}}',
+          missingUnknown: 'Источник не отдал число серий этого сезона.',
+          missingNone: 'Все серии на месте.',
+          missingList: 'Не хватает',
         },
       },
     },
@@ -762,6 +770,14 @@ const resources = {
           refreshEpisodes: 'Refresh episodes',
           refreshing: 'Refreshing…',
           refreshedCount: 'Episodes updated: {{count}}',
+          findMissing: 'Find missing episodes',
+          missingTitle: 'Missing episodes',
+          missingNoSeasons: 'No loaded episodes with recognized numbers.',
+          seasonN: 'Season {{n}}',
+          loadedOf: 'loaded {{loaded}} of {{total}}',
+          missingUnknown: 'The source did not return the episode count for this season.',
+          missingNone: 'All episodes present.',
+          missingList: 'Missing',
         },
       },
     },