"use client"

import { Suspense, useCallback, useEffect, useRef, useState } from "react"
import { Frame, FramePanel } from "@/components/reui/frame"
import { PageHeader } from "@/components/page-header"
import { backups as mockBackups, servers as mockServers, type Backup, type Server } from "@/lib/data"
import { useBackupsUrlState } from "@/hooks/use-backups-url-state"
import { backupStorageSettingsDtoSchema, type BackupScheduleSettingsDto, type BackupStorageSettingsDto } from "@mmapp/contracts/backups"
import { KpiStatGrid } from "@/components/reui-kit/kpi-stat-grid"
import { Alert, AlertAction, AlertDescription, AlertTitle } from "@/components/reui/alert"
import { Button } from "@/components/ui/button"
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs"
import {
  CloudIcon,
  ClockIcon,
  HardDriveIcon,
  PlusIcon,
  RefreshCwIcon,
} from "lucide-react"
import { useDataSource } from "@/lib/data-source"
import { serverListSchema } from "@mmapp/contracts/servers"
import { can } from "@/lib/auth"
import { userApiError } from "@/shared/api/users"
import { toFrontendServer } from "@/entities/server/model/mappers"
import {
  deleteBackup,
  downloadBackup,
  getBackupScheduleSettings,
  getBackupStorageSettings,
  listBackups,
  putBackupScheduleSettings,
  putBackupStorageSettings,
  restoreBackup,
  syncBackupsFromStorage,
  testBackupStorage,
  type BackupItem,
} from "@/shared/api/backups"
import { ApiClientError, requestJson } from "@/shared/api/http-client"
import { toast } from "sonner"
import { useBackupRestoreGuard } from "@/lib/use-backup-restore-guard"
import { restoreWasNotApplied } from "@/lib/backup-restore-checkpoint"
import { Checkbox } from "@/components/ui/checkbox"
import { useBackupJob } from "@/lib/use-backup-job"
import { backupJobOutcome, backupJobResultError } from "@/lib/backup-job-poll"
import { backupSchedulePayload, backupStoragePayload } from "@/lib/backup-settings"
import { BackupsHistory } from "@/components/backups/backups-history"
import { backupFileMissing } from "@/lib/backup-file-state"
import {
  BackupsSettings,
  WEEK_DAYS,
  defaultSchedule,
  defaultStorageForm,
  type BackupScheduleForm,
  type BackupStorageForm,
} from "@/components/backups/backups-settings"
import { BackupCreateSheet } from "@/components/backups/backup-create-sheet"
import { BackupDeleteDialog, BackupRestoreDialog } from "@/components/backups/backup-confirm-dialogs"

type PageTab = "history" | "settings"

type Resource = "backups" | "servers" | "schedule" | "storage"
type ResourceState = { known: boolean; error: string | null; receivedAt: string | null }
const unknownResource = (): ResourceState => ({ known: false, error: null, receivedAt: null })

export default function BackupsPage() { return <Suspense fallback={<p role="status" className="p-5">Загрузка контекста резервных копий…</p>}><BackupsSource /></Suspense> }
function BackupsSource() {
  const { mode, backendUrl, prefsHydrated } = useDataSource()
  if (!prefsHydrated) return <p role="status" className="p-5">Загрузка настроек источника…</p>
  return <BackupsContent key={mode + ":" + backendUrl} />
}
function BackupsContent() {
  const { mode, backendUrl } = useDataSource()
  const isLive = mode === "live"
  const canRead = can("mm:backups:read")
  const canWrite = isLive && can("mm:backups:write")
  const canReadServers = can("mm:servers:read")
  const [resources, setResources] = useState<Record<Resource, ResourceState>>(() => ({ backups: unknownResource(), servers: unknownResource(), schedule: unknownResource(), storage: unknownResource() }))
  const dialogTrigger = useRef<{ element: HTMLElement; rowId: string | null; label: string | null } | null>(null)
  const refreshTrigger = useRef<HTMLButtonElement | null>(null)
  const captureDialogFocus = () => {
    const element = document.activeElement
    dialogTrigger.current = element instanceof HTMLElement
      ? { element, rowId: element.closest("[data-row-id]")?.getAttribute("data-row-id") ?? null, label: element.getAttribute("aria-label") }
      : null
  }
  const returnDialogFocus = () => {
    const trigger = dialogTrigger.current
    if (trigger?.element.isConnected) return trigger.element
    // Cell renderers can remount when operation state changes; resolve the same row/action.
    if (trigger?.rowId && trigger.label) {
      const replacement = document.querySelector<HTMLElement>(`[data-row-id="${CSS.escape(trigger.rowId)}"] button[aria-label="${CSS.escape(trigger.label)}"]`)
      if (replacement) return replacement
    }
    return refreshTrigger.current
  }
  const reader = useRef<AbortController | null>(null)
  const revision = useRef(0)
  const alive = useRef(true)
  const scheduleDirty = useRef(false)
  const storageDirty = useRef(false)
  const operationLock = useRef(false)
  const operationController = useRef<AbortController | null>(null)
  const downloadControllers = useRef(new Map<string, AbortController>())
  const settingsLock = useRef(false)
  const settingsController = useRef<AbortController | null>(null)
  const known = (resource: Resource) => !isLive || resources[resource].known
  const current = (resource: Resource) => known(resource) && !resources[resource].error
  const { tab, setTab, kindFilter, setKindFilter, search, setSearch, filters: advancedFilters, setFilters: setAdvancedFilters, error: urlError, reset: resetContext } = useBackupsUrlState()
  const [backupList, setBackupList] = useState<Backup[]>(isLive ? [] : mockBackups)
  const [liveServers, setLiveServers] = useState<Server[]>(isLive ? [] : mockServers)
  const baseCanCreate = canWrite && canReadServers && liveServers.length > 0 && current("servers") && current("storage")
  const [loading, setLoading] = useState(false)
  const restoreGuard = useBackupRestoreGuard(backendUrl, isLive)
  const [restoreReviewed, setRestoreReviewed] = useState(false)
  const [opBusy, setOpBusy] = useState(false)
  const [opError, setOpError] = useState<string | null>(null)
  const [scheduleSaveBusy, setScheduleSaveBusy] = useState(false)
  const [testBusy, setTestBusy] = useState(false)
  const [syncBusy, setSyncBusy] = useState(false)
  const [schedule, setSchedule] = useState<BackupScheduleForm>(defaultSchedule)
  const [storage, setStorage] = useState<BackupStorageForm>(defaultStorageForm)
  const [storageIsDirty, setStorageIsDirty] = useState(false)
  const [savedSchedule, setSavedSchedule] = useState<BackupScheduleSettingsDto | null>(null)
  const [savedStorage, setSavedStorage] = useState<BackupStorageSettingsDto | null>(null)
  const [scheduleLastError, setScheduleLastError] = useState<string | null>(null)
  const [allEnabled, setAllEnabled] = useState(true)
  const [selectedServers, setSelectedServers] = useState<Set<string>>(new Set())
  const [manualOpen, setManualOpen] = useState(false)
  const [manualStep, setManualStep] = useState(1)
  const [manualServers, setManualServers] = useState<Set<string>>(new Set())
  const [manualNotes, setManualNotes] = useState("")
  const [deleteTarget, setDeleteTarget] = useState<Backup | null>(null)
  const [restoreTarget, setRestoreTarget] = useState<Backup | null>(null)

  const setSched = <K extends keyof BackupScheduleForm>(k: K, v: BackupScheduleForm[K]) => { scheduleDirty.current = true; setSchedule(s => ({ ...s, [k]: v })) }
  const setStore = <K extends keyof BackupStorageForm>(k: K, v: BackupStorageForm[K]) => { if (k !== "showPassword") { storageDirty.current = true; setStorageIsDirty(true) } setStorage(s => ({ ...s, [k]: v })) }

  const mapApiBackupToUi = useCallback((b: BackupItem): Backup => {
    const kb = Math.round(b.sizeBytes / 1024)
    return {
      id: b.id,
      server: b.serverName,
      serverId: b.serverId == null ? null : String(b.serverId),
      filename: b.filename,
      size: b.sizeBytes < 1024 ? `${b.sizeBytes} Б` : `${kb} КБ`,
      sizeBytes: b.sizeBytes,
      created: new Date(b.createdAt).toLocaleString("ru-RU"),
      kind: b.kind,
      notes: b.notes ?? "",
      storage: b.storage,
      uploadError: b.uploadError ?? undefined,
      localFileStatus: b.localFileStatus,
    }
  }, [])

  const loadLive = useCallback(async () => {
    if (!isLive || !canRead || !alive.current) return
    reader.current?.abort()
    const abort = new AbortController(), version = ++revision.current
    reader.current = abort
    const signal = AbortSignal.any([abort.signal, AbortSignal.timeout(30_000)])
    const active = () => alive.current && !abort.signal.aborted && revision.current === version
    const success = (resource: Resource) => { if (active()) setResources(prev => ({ ...prev, [resource]: { known: true, error: null, receivedAt: new Date().toISOString() } })) }
    const failure = (resource: Resource, error: unknown) => { if (active()) setResources(prev => ({ ...prev, [resource]: { ...prev[resource], error: userApiError(error) } })) }
    setLoading(true)
    await Promise.allSettled([
      listBackups(backendUrl, { signal }).then(rows => { if (!active()) return; setBackupList(rows.map(mapApiBackupToUi)); success("backups") }).catch(error => failure("backups", error)),
      canReadServers ? requestJson<unknown>(backendUrl, "/api/servers", { signal }).then(payload => {
        const rows = serverListSchema.parse(payload)
        if (!active()) return
        setLiveServers(rows.map(row => ({ ...toFrontendServer(row), status: row.status ?? "unknown" }))); success("servers")
      }).catch(error => failure("servers", error)) : Promise.resolve(),
      getBackupScheduleSettings(backendUrl, { signal }).then(row => {
        if (!active()) return
        if (!scheduleDirty.current) { setSchedule(row); setSelectedServers(new Set(row.serverIds)); setAllEnabled(row.serverIds.length === 0) }
        setSavedSchedule(row); setScheduleLastError(row.lastError ?? null); success("schedule")
      }).catch(error => failure("schedule", error)),
      getBackupStorageSettings(backendUrl, { signal }).then(row => {
        if (!active()) return
        setSavedStorage(row)
        if (!storageDirty.current) setStorage(prev => ({ ...prev, ...row, s3SecretAccessKey: "" }))
        success("storage")
      }).catch(error => failure("storage", error)),
    ])
    if (active()) setLoading(false)
  }, [backendUrl, isLive, canRead, canReadServers, mapApiBackupToUi])
  useEffect(() => {
    alive.current = true
    const downloads = downloadControllers.current
    queueMicrotask(() => { if (alive.current) void loadLive() })
    return () => { alive.current = false; reader.current?.abort(); settingsController.current?.abort(); operationController.current?.abort(); downloads.forEach(controller => controller.abort()) }
  }, [loadLive])

  const job = useBackupJob(backendUrl, isLive, canRead, baseCanCreate && !opBusy && !scheduleSaveBusy, loadLive)
  const checkpoint = job.checkpoint
  const jobTerminal = !!checkpoint?.job && ["done", "failed"].includes(checkpoint.job.status)
  const backupJobId = checkpoint && !jobTerminal ? checkpoint.request.requestId : null
  const persistedJobError = checkpoint?.job && jobTerminal ? backupJobResultError(checkpoint.job) : null
  const canCreate = baseCanCreate && job.hydrated && !checkpoint && !job.storageError

  function startSettingsMutation() {
    if (!alive.current || settingsLock.current || operationLock.current || backupJobId) return null
    settingsLock.current = true
    const abort = new AbortController()
    settingsController.current = abort
    reader.current?.abort(); revision.current += 1; setLoading(false)
    setScheduleSaveBusy(true); setOpError(null)
    return abort
  }
  function finishSettingsMutation(abort: AbortController) {
    if (settingsController.current !== abort) return
    settingsLock.current = false; settingsController.current = null
    if (alive.current) { setScheduleSaveBusy(false); setTestBusy(false); setSyncBusy(false) }
  }
  function settingsConfirmed(resource: Resource) {
    setResources(prev => ({ ...prev, [resource]: { known: true, error: null, receivedAt: new Date().toISOString() } }))
  }
  async function handleSave() {
    if (!canWrite || !current("schedule") || !current("servers") || !canReadServers) return
    const abort = startSettingsMutation(); if (!abort) return
    try {
      const payload = backupSchedulePayload(schedule, [...selectedServers], allEnabled)
      if (payload.serverIds?.some(id => !liveServers.some(server => server.id === id))) throw new Error("Выбранный сервер отсутствует; обновите или измените выбор")
      const result = await putBackupScheduleSettings(backendUrl, payload, { signal: abort.signal })
      if (!alive.current || abort.signal.aborted) return
      setSavedSchedule(result); setSchedule(result); setScheduleLastError(result.lastError ?? null); scheduleDirty.current = false
      setSelectedServers(new Set(result.serverIds)); setAllEnabled(result.serverIds.length === 0); settingsConfirmed("schedule")
      toast.success("Расписание сохранено")
    } catch (error) { if (alive.current && !abort.signal.aborted) setOpError(userApiError(error)) }
    finally { finishSettingsMutation(abort) }
  }
  async function handleSaveStorage() {
    if (!canWrite || !current("storage")) return
    const abort = startSettingsMutation(); if (!abort) return
    try {
      const result = await putBackupStorageSettings(backendUrl, backupStoragePayload(storage, savedStorage?.secretConfigured), { signal: abort.signal })
      if (!alive.current || abort.signal.aborted) return
      setSavedStorage(result); setStorage(prev => ({ ...prev, ...result, s3SecretAccessKey: "" })); storageDirty.current = false; setStorageIsDirty(false); settingsConfirmed("storage")
      toast.success("Хранилище сохранено")
    } catch (error) { if (alive.current && !abort.signal.aborted) setOpError(userApiError(error)) }
    finally { finishSettingsMutation(abort) }
  }
  async function handleTestStorage() {
    if (!canWrite || !current("storage")) return
    if (storageDirty.current) { setOpError("Сначала сохраните хранилище; проверка использует подтверждённые настройки"); return }
    if (savedStorage?.provider !== "s3") { setOpError("Проверка доступна для сохранённого хранилища S3"); return }
    const abort = startSettingsMutation(); if (!abort) return
    setTestBusy(true)
    try {
      const result = await testBackupStorage(backendUrl, { signal: abort.signal })
      if (!alive.current || abort.signal.aborted) return
      setSavedStorage(result); settingsConfirmed("storage")
      if (result.lastTestError || !result.lastTestAt || result.provider !== "s3") throw new Error(result.lastTestError || "Проверка S3 не подтверждена")
      toast.success("Доступ к S3 подтверждён")
    } catch (error) {
      if (alive.current && !abort.signal.aborted) {
        if (error instanceof ApiClientError && error.payload && typeof error.payload === "object" && "settings" in error.payload) {
          const parsed = backupStorageSettingsDtoSchema.safeParse(error.payload.settings)
          if (parsed.success) setSavedStorage(parsed.data)
        }
        setOpError(userApiError(error))
      }
    }
    finally { finishSettingsMutation(abort) }
  }
  async function handleSyncStorage() {
    if (!canWrite || !current("storage")) return
    if (storageDirty.current) { setOpError("Сначала сохраните хранилище; синхронизация использует подтверждённые настройки"); return }
    if (savedStorage?.provider !== "s3") return
    const abort = startSettingsMutation(); if (!abort) return
    setSyncBusy(true)
    try {
      const result = await syncBackupsFromStorage(backendUrl, { signal: abort.signal })
      if (!alive.current || abort.signal.aborted) return
      toast.success("Импортировано: " + result.imported + ", пропущено: " + result.skipped)
      await loadLive()
    } catch (error) { if (alive.current && !abort.signal.aborted) setOpError(userApiError(error)) }
    finally { finishSettingsMutation(abort) }
  }

  async function handleManualBackup() {
    if (checkpoint) { await job.run(); return }
    if (!canCreate || !manualServers.size || settingsLock.current || opBusy) return
    if ([...manualServers].some(id => !liveServers.some(server => server.id === id))) { setOpError("Выбранный сервер отсутствует; обновите выбор"); return }
    await job.run({ serverIds: [...manualServers], notes: manualNotes || undefined })
  }

  useEffect(() => {
    if (opError) toast.error(opError)
  }, [opError])

  function startOperation() {
    if (!canWrite || !alive.current || operationLock.current || settingsLock.current || backupJobId) return null
    operationLock.current = true
    const abort = new AbortController(); operationController.current = abort
    reader.current?.abort(); revision.current += 1; setLoading(false)
    setOpBusy(true); setOpError(null)
    return abort
  }
  function finishOperation(abort: AbortController) {
    if (operationController.current !== abort) return
    operationLock.current = false; operationController.current = null
    if (alive.current) setOpBusy(false)
  }
  async function handleDelete() {
    if (!deleteTarget) return
    const target = deleteTarget, abort = startOperation(); if (!abort) return
    try {
      await deleteBackup(backendUrl, target.id, { signal: abort.signal }, backupFileMissing(target))
      if (!alive.current || abort.signal.aborted) return
      setBackupList(previous => previous.filter(backup => backup.id !== target.id)); setDeleteTarget(null)
      toast.success("API подтвердил удаление резервной копии")
      await loadLive()
    } catch (error) { if (alive.current && !abort.signal.aborted) setOpError(userApiError(error)) }
    finally { finishOperation(abort) }
  }
  async function handleRestore() {
    if (!restoreTarget || !restoreTarget.serverId || !restoreGuard.canStart) return
    if (backupFileMissing(backupList.find(backup => backup.id === restoreTarget.id) ?? restoreTarget)) {
      setOpError("Локальный файл отсутствует. Создайте новую резервную копию.")
      return
    }
    const target = restoreTarget, abort = startOperation(); if (!abort) return
    let sent = false
    try {
      if (!restoreGuard.begin({ backupId: target.id, serverId: Number(target.serverId), filename: target.filename, serverName: target.server })) return
      sent = true
      const result = await restoreBackup(backendUrl, target.id, { signal: abort.signal }, Number(target.serverId))
      if (!alive.current || abort.signal.aborted) return
      if (result.filename !== target.filename) throw new Error("Ответ восстановления относится к другому файлу")
      toast.success("API подтвердил импорт " + result.filename + " на " + result.serverName)
      restoreGuard.clear(); setRestoreTarget(null)
    } catch (error) {
      if (alive.current && !abort.signal.aborted) {
        if (sent && restoreWasNotApplied(error)) restoreGuard.clear()
        setOpError(userApiError(error) + (sent && !restoreWasNotApplied(error) ? ". Результат импорта неизвестен; проверьте роутер перед повтором" : ""))
      }
    }
    finally { finishOperation(abort) }
  }
  async function handleDownload(id: string, filename: string) {
    if (!isLive || !canRead || !alive.current || downloadControllers.current.has(id)) return
    const abort = new AbortController(); downloadControllers.current.set(id, abort)
    try {
      const blob = await downloadBackup(backendUrl, id, { signal: abort.signal })
      if (!alive.current || abort.signal.aborted) return
      const url = URL.createObjectURL(blob)
      try {
        const anchor = document.createElement("a"); anchor.href = url; anchor.download = filename; anchor.click()
      } finally { URL.revokeObjectURL(url) }
    } catch (error) { if (alive.current && !abort.signal.aborted) setOpError(userApiError(error)) }
    finally { if (downloadControllers.current.get(id) === abort) downloadControllers.current.delete(id) }
  }

  const autoCount = backupList.filter((b) => b.kind === "auto").length
  const manualCount = backupList.filter((b) => b.kind === "manual").length
  const s3Count = backupList.filter((b) => b.storage === "s3" || b.storage === "both").length

  const schedSummary = (() => {
    const confirmed = isLive ? savedSchedule : defaultSchedule
    if (!confirmed) return "Расписание пока неизвестно"
    if (!confirmed.enabled) return "Расписание отключено"
    const time = String(confirmed.hour).padStart(2, "0") + ":" + String(confirmed.minute).padStart(2, "0")
    if (confirmed.frequency === "daily") return "Каждый день в " + time
    if (confirmed.frequency === "weekly") return "Каждую неделю (" + WEEK_DAYS[Number(confirmed.weekDay)] + ") в " + time
    return confirmed.monthDay + "-го числа каждого месяца в " + time
  })()
  const confirmedStorage = isLive ? savedStorage : defaultStorageForm
  const destinationLabel = !confirmedStorage ? "Хранилище пока неизвестно" : confirmedStorage.provider === "s3"
    ? (confirmedStorage.keepLocalCopy ? "локально и в S3" : "в S3")
    : "локально (storage/backups)"

  const statusDetail = [
    backupJobId ? null : `${destinationLabel} · ${known("servers") ? liveServers.length + " серверов в каталоге" : "Серверы пока неизвестны"}`,
    scheduleLastError,
    savedStorage?.lastTestError,
  ].filter(Boolean).join(" · ")

  const alertVariant = backupJobId
    ? "info"
    : opError || scheduleLastError || savedStorage?.lastTestError
      ? "warning"
      : "default"

  function openCreate(all: boolean) {
    if (checkpoint) { setManualStep(3); setManualOpen(true); return }
    if (!canCreate) return
    setManualServers(all ? new Set(liveServers.map((s) => s.id)) : new Set())
    setManualNotes("")
    setManualStep(1)
    setManualOpen(true)
  }

  return (
    <div className="flex min-h-0 min-w-0 flex-col h-full">
      <PageHeader
        crumbs={[{ label: "Управление" }, { label: "Бэкапы" }]}
        actions={
          <>
            <Button
              type="button"
              variant="outline"
              size="sm"
              onClick={() => openCreate(true)}
              disabled={!canCreate || loading || job.busy}
            >
              <RefreshCwIcon className="size-4" />
              Снять со всех
            </Button>
            <Button
              type="button"
              size="sm"
              onClick={() => openCreate(false)}
              disabled={checkpoint ? !canRead : !canCreate || loading || job.busy}
            >
              <PlusIcon className="size-4" />
              {checkpoint ? "Задача резервного копирования" : "Новый бэкап"}
            </Button>
          </>
        }
      />

      <div className="min-w-0 flex-1 overflow-y-auto p-3 sm:p-6">
        <div className="flex flex-col gap-5">
          {urlError && <Alert variant="warning" aria-label="Контекст резервных копий"><AlertTitle>Не удалось прочитать ссылку</AlertTitle><AlertDescription>{urlError}</AlertDescription><AlertAction><Button type="button" variant="outline" onClick={resetContext}>Сбросить контекст</Button></AlertAction></Alert>}
          {!isLive && <p role="status" className="text-sm text-muted-foreground">Демонстрационные данные. Операции и сохранение недоступны.</p>}
          {!canRead && <p role="status">Нет права mm:backups:read</p>}
          {isLive && !canReadServers && <p role="status">Каталог устройств недоступен без mm:servers:read.</p>}
          {isLive && canRead && <div className="flex flex-wrap items-center gap-3 text-sm text-muted-foreground">
            <Button type="button" variant="outline" size="sm" ref={refreshTrigger} onClick={() => void loadLive()} disabled={loading || scheduleSaveBusy || opBusy}>Обновить</Button>
            <span role="status">{loading ? "Обновление данных…" : resources.backups.receivedAt ? "Получено: " + new Date(resources.backups.receivedAt).toLocaleString("ru-RU") : "Резервные копии пока неизвестны"}</span>
          </div>}
          {isLive && (Object.keys(resources) as Resource[]).filter(resource => resources[resource].error).map(resource => <Alert key={resource} variant="warning" aria-label={"Данные резервных копий: " + resource}>
            <AlertTitle>{resources[resource].known ? "Последние данные сохранены" : "Данные пока неизвестны"}</AlertTitle>
            <AlertDescription>{({ backups: "История", servers: "Серверы", schedule: "Расписание", storage: "Хранилище" })[resource]}: {resources[resource].error}</AlertDescription>
          </Alert>)}

          {isLive && (restoreGuard.checkpoint || restoreGuard.error) && <Alert variant="warning" aria-label="Подтверждение восстановления">
            <AlertTitle>{opBusy && restoreTarget ? "Импорт ожидает подтверждения" : "Проверьте результат восстановления"}</AlertTitle>
            <AlertDescription className="flex flex-col gap-3">
              <span>{restoreGuard.error || (restoreGuard.checkpoint ? restoreGuard.checkpoint.filename + " → " + restoreGuard.checkpoint.serverName + ". Ответ ещё не подтверждён. Закрытие страницы не отменяет импорт." : "")}</span>
              <label className="flex items-start gap-2"><Checkbox checked={restoreReviewed} disabled={opBusy || !canWrite} onCheckedChange={value => setRestoreReviewed(value === true)} />Я проверил состояние роутера и понимаю последствия повторного импорта</label>
              <Button type="button" variant="outline" disabled={!restoreReviewed || opBusy || !canWrite} onClick={() => { if (restoreGuard.clear()) { setRestoreReviewed(false); setOpError(null) } }}>Разрешить новое восстановление</Button>
            </AlertDescription>
          </Alert>}
          {opError && <Alert variant="warning" aria-label="Операция резервных копий"><AlertTitle>Операция не подтверждена</AlertTitle><AlertDescription>{opError}</AlertDescription></Alert>}
          {(job.error || job.storageError || persistedJobError) && <Alert variant="warning" aria-label="Задача резервного копирования"><AlertTitle>{jobTerminal ? "Задача завершена с ограничениями" : "Результат задачи пока неизвестен"}</AlertTitle><AlertDescription>{job.error || job.storageError || persistedJobError}</AlertDescription></Alert>}
          <div><h1 className="text-xl font-semibold">Резервные копии</h1><p className="text-sm text-muted-foreground">История файлов, расписание и подтверждения операций</p></div>
          <KpiStatGrid
            aria-label="Сводка бэкапов"
            items={[
              {
                id: "all",
                label: "Всего бэкапов",
                value: known("backups") ? backupList.length : "—",
                icon: <HardDriveIcon className="size-4" />,
                iconClassName: "text-muted-foreground",
              },
              {
                id: "auto",
                label: "Авто",
                value: known("backups") ? autoCount : "—",
                icon: <ClockIcon className="size-4" />,
                iconClassName: "text-info",
              },
              {
                id: "manual",
                label: "Вручную",
                value: known("backups") ? manualCount : "—",
                icon: <PlusIcon className="size-4" />,
                iconClassName: "text-muted-foreground",
              },
              {
                id: "s3",
                label: "В S3",
                value: known("backups") ? s3Count : "—",
                icon: <CloudIcon className="size-4" />,
                iconClassName: "text-primary",
              },
            ]}
          />

          <Alert variant={alertVariant}>
            <ClockIcon />
            <AlertTitle>
              {backupJobId ? (checkpoint?.accepted ? "Задача наблюдается" : "Результат запроса пока неизвестен") : schedSummary}
            </AlertTitle>
            <AlertDescription>
              {backupJobId
                ? "Закрытие формы не отменяет задачу. Проверка продолжает чтение того же ID."
                : statusDetail}
            </AlertDescription>
            <AlertAction>
              <Button type="button" variant="ghost" size="xs" onClick={() => setTab("settings")}>
                Настройки
              </Button>
            </AlertAction>
          </Alert>

          <Frame dense className="min-w-0"><FramePanel className="min-w-0 p-3 sm:p-5">
          <Tabs
            value={tab}
            onValueChange={(v) => setTab(String(v) as PageTab)}
            className="gap-5"
          >
            <TabsList variant="line" className="w-fit">
              <TabsTrigger value="history">История бэкапов</TabsTrigger>
              <TabsTrigger value="settings">Настройки</TabsTrigger>
            </TabsList>
            <TabsContent value="history" className="flex flex-col gap-5">
              {urlError ? null : !canRead ? <p role="status">История недоступна без права чтения</p> : !known("backups") ? <p role="status">{resources.backups.error ? "История резервных копий пока неизвестна" : "Загрузка резервных копий…"}</p> : <BackupsHistory
                backups={backupList}
                kindFilter={kindFilter}
                onKindFilterChange={setKindFilter}
                search={search}
                onSearchChange={setSearch}
                filters={advancedFilters}
                onFiltersChange={setAdvancedFilters}
                onDownload={handleDownload}
                onRestore={backup => { captureDialogFocus(); setOpError(null); setRestoreTarget(backup) }}
                onDelete={backup => { captureDialogFocus(); setOpError(null); setDeleteTarget(backup) }}
                onCreate={() => openCreate(false)}
                canCreate={canCreate}
                canWrite={canWrite && !opBusy && !scheduleSaveBusy && !backupJobId}
                canRestore={restoreGuard.canStart}
                canDownload={isLive && canRead}
              />}
            </TabsContent>
            <TabsContent value="settings">

              <BackupsSettings
                schedule={schedule}
                onScheduleChange={setSched}
                storage={storage}
                onStorageChange={setStore}
                savedStorage={savedStorage}
                servers={liveServers}
                selectedServers={selectedServers}
                onToggleServer={(id) => {
                  scheduleDirty.current = true
                  setSelectedServers((prev) => {
                    const next = new Set(prev)
                    if (next.has(id)) next.delete(id)
                    else next.add(id)
                    return next
                  })
                }}
                onSelectAll={() => { scheduleDirty.current = true; setAllEnabled(false); setSelectedServers(new Set(liveServers.map(s => s.id))) }}
                onClearServers={() => { scheduleDirty.current = true; setSelectedServers(new Set()) }}
                onSave={handleSave}
                onSaveStorage={handleSaveStorage}
                scheduleKnown={known("schedule")}
                storageKnown={known("storage")}
                storageDirty={storageIsDirty}
                scheduleWritable={canWrite && canReadServers && current("schedule") && current("servers") && !backupJobId}
                storageWritable={canWrite && current("storage") && !backupJobId}
                allEnabled={allEnabled}
                onAllEnabledChange={value => { scheduleDirty.current = true; setAllEnabled(value) }}
                onTest={handleTestStorage}
                onSync={handleSyncStorage}
                saveBusy={scheduleSaveBusy}
                testBusy={testBusy}
                syncBusy={syncBusy}
              />

            </TabsContent>
          </Tabs>
          </FramePanel></Frame>
        </div>
      </div>

      <BackupCreateSheet
        open={manualOpen}
        onOpenChange={setManualOpen}
        step={manualStep}
        onStepChange={setManualStep}
        servers={liveServers}
        selected={checkpoint ? new Set(checkpoint.request.serverIds.map(String)) : manualServers}
        onToggle={(id) => {
          setManualServers((prev) => {
            const next = new Set(prev)
            if (next.has(id)) next.delete(id)
            else next.add(id)
            return next
          })
        }}
        onSelectAll={() => setManualServers(new Set(liveServers.map((s) => s.id)))}
        onClear={() => setManualServers(new Set())}
        notes={checkpoint?.request.notes ?? manualNotes}
        onNotesChange={setManualNotes}
        destinationLabel={destinationLabel}
        busy={job.busy}
        locked={!!checkpoint}
        terminal={jobTerminal}
        canObserve={canRead}
        jobId={checkpoint?.request.requestId}
        jobStatus={checkpoint?.job ? ({ queued: "В очереди", running: "Выполняется", done: checkpoint?.job && backupJobOutcome(checkpoint.job).fullSuccess ? "Завершена" : "Завершена с ограничениями", failed: "Прервана" })[checkpoint.job.status] + ": " + checkpoint.job.completed + "/" + checkpoint.job.total : checkpoint?.accepted ? "Запрос принят, результат ещё неизвестен" : "Результат запроса ещё неизвестен"}
        error={job.error || job.storageError || persistedJobError}
        result={checkpoint?.job && jobTerminal ? "Создано " + backupJobOutcome(checkpoint.job).created + " из " + checkpoint.job.total : undefined}
        onReset={() => { if (job.reset()) { setManualServers(new Set()); setManualNotes(""); setManualStep(1) } }}
        onSubmit={handleManualBackup}
      />

      <BackupDeleteDialog
        returnFocus={returnDialogFocus}
        backup={deleteTarget}
        busy={opBusy}
        error={opError}
        onConfirm={() => void handleDelete()}
        onCancel={() => setDeleteTarget(null)}
      />
      <BackupRestoreDialog
        returnFocus={returnDialogFocus}
        backup={restoreTarget}
        busy={opBusy}
        blocked={!restoreGuard.canStart || Boolean(restoreTarget && backupFileMissing(backupList.find(backup => backup.id === restoreTarget.id) ?? restoreTarget))}
        error={restoreTarget && backupFileMissing(backupList.find(backup => backup.id === restoreTarget.id) ?? restoreTarget) ? "Локальный файл отсутствует. Создайте новую резервную копию." : opError}
        onConfirm={() => void handleRestore()}
        onCancel={() => setRestoreTarget(null)}
      />
    </div>
  )
}