import { useEffect, useMemo, useState } from 'react'
import { createFileRoute, Link, useNavigate } from '@tanstack/react-router'
import { useTranslation } from 'react-i18next'
import axios from 'axios'
import {
  Alert,
  Badge,
  Button,
  Checkbox,
  EmptyState,
  IconButton,
  LoadingBlock,
  Modal,
  PageHeader,
  Panel,
  SearchInput,
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeaderCell,
  TableRow,
  TextInput,
} from '@/ui'
import { PlusIcon, PencilSimpleIcon, XCircleIcon, GearIcon, ClockCounterClockwiseIcon, MapTrifoldIcon, TrashIcon, CheckCircleIcon, WarningIcon, XIcon, DownloadSimpleIcon, CaretLeftIcon, CaretRightIcon } from '@phosphor-icons/react'
import {
  useAudit,
  useDictionaryDetail,
  useDictPendingDrafts,
  useRecordRaw,
  useRecords,
  type RecordsFilter,
} from '@/api/queries'
import { useBulkCloseRecords, useBulkExportRecords, useCreateRecord, useUpdateRecord, useCloseRecord, useFormIdempotencyKey } from '@/api/mutations'
import { useCanMutate } from '@/auth/useCanMutate'
import type { BulkCloseResponse, CreateRecordRequest, DataScope, FlattenedRecord } from '@/api/client'
import { SchemaDrivenForm } from '@/components/form/SchemaDrivenForm'
import { DictionaryEditorDialog } from '@/components/schema/DictionaryEditorDialog'
import { DictionaryDependentsPanel } from '@/components/lineage/DictionaryDependentsPanel'
import { DictionaryHubView } from '@/components/lineage/DictionaryHubView'
import { CascadeConfirmDialog } from '@/components/lineage/CascadeConfirmDialog'
import { RecordHistoryDrawer } from '@/components/record/RecordHistoryDrawer'
import { RecordDrawer } from '@/components/record/RecordDrawer'
import { AoiPickerDialog, type AoiResult } from '@/components/geo/AoiPickerDialog'
import { TimeTravelPicker } from '@/components/timetravel/TimeTravelPicker'
import { nowIsoLocal } from '@/lib/dates'
import { recordDisplayName } from '@/lib/locales'
import { SCOPE_BORDER_TOP, SCOPE_DOT, SCOPE_ORDER } from '@/lib/scope-style'

/**
 * URL search params для filter state — share-friendly, persist между F5.
 * - q: search query (free text)
 * - scopes: csv subset of PUBLIC/INTERNAL/RESTRICTED. Empty/missing = все.
 * - bbox: AOI как CSV "west,south,east,north". Polygon AOI в URL не
 *   сериализуем — слишком длинно (50+ точек), оставляем в local state.
 *   Если bbox задан — initial AOI установится в bbox-режим при mount'е.
 */
type DictSearch = {
  q?: string
  scopes?: string
  bbox?: string
  /** Time-travel: ISO datetime "просмотр на момент X". Если задан — backend
   *  findActiveAt(at) возвращает active version на этот момент вместо now(). */
  at?: string
  /** Active editor tab (Stage 3.4 handoff design):
   *  - records (default): table + filters + edit modal
   *  - relations: dependents graph (incoming FK refs + outgoing schema FKs)
   *  - fields: schema properties grid
   *  - json: raw schema JSON viewer
   *  - events: audit log filtered к этому dict
   *  - history: timeline записей changes
   *  Backward-compat: старый ?view=hub аутенитично remap'нется в ?tab=relations. */
  tab?: 'records' | 'relations' | 'fields' | 'json' | 'events' | 'history'
}

const SCOPE_VALUES: ReadonlySet<DataScope> = new Set(['PUBLIC', 'INTERNAL', 'RESTRICTED'])

const validateSearch = (raw: Record<string, unknown>): DictSearch => {
  const out: DictSearch = {}
  if (typeof raw.q === 'string' && raw.q.length > 0) out.q = raw.q
  if (typeof raw.scopes === 'string') {
    const valid = raw.scopes
      .split(',')
      .map((s) => s.trim().toUpperCase())
      .filter((s): s is DataScope => SCOPE_VALUES.has(s as DataScope))
    if (valid.length > 0) out.scopes = valid.join(',')
  }
  if (typeof raw.bbox === 'string' && /^-?\d+(\.\d+)?(,-?\d+(\.\d+)?){3}$/.test(raw.bbox)) {
    out.bbox = raw.bbox
  }
  // ISO datetime check: 2026-05-08T12:00:00Z или 2026-05-08T12:00:00+03:00.
  if (typeof raw.at === 'string' && !isNaN(Date.parse(raw.at))) {
    out.at = raw.at
  }
  // Tab param + backward-compat для старого ?view=hub.
  const TABS: ReadonlySet<DictSearch['tab']> = new Set([
    'records', 'relations', 'fields', 'json', 'events', 'history',
  ])
  if (typeof raw.tab === 'string' && TABS.has(raw.tab as DictSearch['tab'])) {
    out.tab = raw.tab as DictSearch['tab']
  } else if (raw.view === 'hub') {
    out.tab = 'relations'
  }
  return out
}

export const Route = createFileRoute('/dictionaries/$name')({
  component: DictionaryDetail,
  validateSearch,
})

type EditState =
  | { kind: 'closed' }
  | { kind: 'create' }
  | { kind: 'edit'; record: FlattenedRecord }
  | { kind: 'close-confirm'; record: FlattenedRecord }

function DictionaryDetail() {
  const { name } = Route.useParams()
  const urlSearch = Route.useSearch()
  const navigate = useNavigate({ from: Route.fullPath })
  const { t } = useTranslation()
  const detailQuery = useDictionaryDetail(name)
  const canMutate = useCanMutate()

  // AOI: bbox из URL → bbox-AOI rendered initially; polygon AOI живёт
  // только в local state (не сериализуем в URL — слишком длинно).
  // setAoi записывает в URL bbox только для bbox-mode (полигон не жмём в URL).
  const [aoi, setAoi] = useState<AoiResult | null>(() => bboxToAoi(urlSearch.bbox))

  // Time-travel state — keep ISO string in URL так чтобы user мог share link
  // "посмотри dict на 2025-12-31T00:00:00Z". Empty/undefined = now().
  const timeTravelAt: string | undefined = urlSearch.at
  const setTimeTravelAt = (next: string | undefined) => {
    void navigate({
      search: (prev) => ({ ...prev, at: next || undefined }),
      replace: true,
    })
  }

  const filter: RecordsFilter | undefined =
    aoi || timeTravelAt
      ? {
          ...(aoi?.kind === 'bbox' ? { bbox: aoi.bboxCsv } : {}),
          ...(aoi?.kind === 'polygon' ? { polygon: aoi.geojson } : {}),
          ...(timeTravelAt ? { at: timeTravelAt } : {}),
        }
      : undefined
  const recordsResult = useRecords(name, 'PUBLIC,INTERNAL,RESTRICTED', filter)
  /**
   * Approval Workflow v2 Phase 4: pending drafts на этот dict — для бейджа
   * "На review" в каждой строке records table. Polled 30s. Bypass'нем если
   * dict не approval-required (нет смысла грузить).
   */
  // Гость (anonymous) — drafts polling требует JWT (401 каждые 30s в console).
  // Disable если не авторизован.
  const pendingDraftsQuery = useDictPendingDrafts(
    canMutate && detailQuery.data?.approvalRequired ? name : undefined,
  )
  const pendingByKey = useMemo(() => {
    const set = new Set<string>()
    for (const d of pendingDraftsQuery.data ?? []) set.add(d.businessKey)
    return set
  }, [pendingDraftsQuery.data])
  const createMut = useCreateRecord(name)
  const updateMut = useUpdateRecord(name)
  // Per-form idempotency key. Stable между ререндерами для одной сессии edit
  // modal'а: двойной submit (Enter + click) не создаст 2 record'а — backend
  // deduplicate'ит по тому же ключу. Reset на onSuccess.
  const [recordIdempotencyKey, resetRecordIdempotencyKey] = useFormIdempotencyKey()
  const closeMut = useCloseRecord(name)
  const bulkCloseMut = useBulkCloseRecords(name)
  const bulkExportMut = useBulkExportRecords(name)

  const [edit, setEdit] = useState<EditState>({ kind: 'closed' })
  const [closeReason, setCloseReason] = useState('')
  // Dirty-field count surfaced by SchemaDrivenForm → shown в RecordDrawer footer.
  const [recordDirtyCount, setRecordDirtyCount] = useState(0)
  const [schemaEditOpen, setSchemaEditOpen] = useState(false)
  const [historyKey, setHistoryKey] = useState<string | undefined>(undefined)
  const [aoiOpen, setAoiOpen] = useState(false)
  const [timeTravelOpen, setTimeTravelOpen] = useState(false)
  /** Phase 3 dict-relationships-v2: cascade dialog state. Открывается из 409
   *  на close, или явным action из record menu. */
  const [cascadeKey, setCascadeKey] = useState<string | undefined>(undefined)

  // Multi-select state. Set<businessKey> — стабильное id'шник. При изменении
  // records data (mutation success / refetch / filter change) — selection
  // не очищаем автоматически, но выкидываем те ключи которых больше нет
  // в видимом фильтре (избегаем "невидимых" выбранных строк).
  const [selection, setSelection] = useState<Set<string>>(new Set())
  const [bulkOpen, setBulkOpen] = useState(false)
  const [bulkReason, setBulkReason] = useState('')
  const [bulkResult, setBulkResult] = useState<BulkCloseResponse | null>(null)

  // Search & scope filter — URL-derived. Empty/missing = все scope активны.
  const search = urlSearch.q ?? ''
  const scopeFilter = useMemo<Set<DataScope>>(
    () => new Set(urlSearch.scopes ? (urlSearch.scopes.split(',') as DataScope[]) : []),
    [urlSearch.scopes],
  )

  const setSearch = (next: string) => {
    void navigate({
      search: (prev) => ({ ...prev, q: next.length > 0 ? next : undefined }),
      replace: true,
    })
  }

  const toggleScope = (scope: DataScope) => {
    const next = new Set(scopeFilter)
    if (next.has(scope)) next.delete(scope)
    else next.add(scope)
    void navigate({
      search: (prev) => ({
        ...prev,
        scopes: next.size > 0 ? Array.from(next).join(',') : undefined,
      }),
      replace: true,
    })
  }

  const handleAoiApply = (result: AoiResult) => {
    setAoi(result)
    // bbox в URL для share; polygon оставляем в memory.
    void navigate({
      search: (prev) => ({
        ...prev,
        bbox: result.kind === 'bbox' ? result.bboxCsv : undefined,
      }),
      replace: true,
    })
  }

  const handleAoiClear = () => {
    setAoi(null)
    void navigate({
      search: (prev) => ({ ...prev, bbox: undefined }),
      replace: true,
    })
  }

  const handleClearFilters = () => {
    void navigate({
      search: (prev) => ({ ...prev, q: undefined, scopes: undefined }),
      replace: true,
    })
  }

  // Уникальные validFrom timestamps для timeline marks. Используем raw
  // recordsResult (не filtered) чтобы видеть все версии независимо от scope/q
  // фильтров.
  const recordTimestamps = useMemo(() => {
    const set = new Set<number>()
    for (const r of recordsResult.data ?? []) {
      const ts = new Date(r.validFrom).getTime()
      if (!Number.isNaN(ts)) set.add(ts)
    }
    return Array.from(set).sort((a, b) => a - b)
  }, [recordsResult.data])

  const filteredRecords = useMemo(() => {
    const raw = recordsResult.data ?? []
    if (raw.length === 0) return raw
    const q = search.trim().toLowerCase()
    const scopes = scopeFilter
    return raw.filter((r) => {
      if (scopes.size > 0 && !scopes.has(r.dataScope)) return false
      if (q.length === 0) return true
      // Search по businessKey + JSON.stringify(data) — простой,
      // покрывает локализованные поля, code, описания. Stringify
      // O(n) в memory, для 100 записей мгновенно.
      if (r.businessKey.toLowerCase().includes(q)) return true
      const haystack = JSON.stringify(r.data).toLowerCase()
      return haystack.includes(q)
    })
  }, [recordsResult.data, search, scopeFilter])

  const filtersActive = search.length > 0 || scopeFilter.size > 0
  const filteredCount = filteredRecords.length

  // Client-side pagination — типичный словарь до 100 записей, server-side
  // пейджинг overkill. Page 0-indexed. PAGE_SIZE = 50 — достаточно чтобы
  // увидеть все основные dictionaries без листания.
  const PAGE_SIZE = 50
  const [page, setPage] = useState(0)
  const totalPages = Math.max(1, Math.ceil(filteredCount / PAGE_SIZE))

  // При изменении filter — на page 0 (иначе page может оказаться вне диапазона)
  useEffect(() => {
    setPage(0)
  }, [search, scopeFilter, aoi])

  const visibleRecords = useMemo(
    () => filteredRecords.slice(page * PAGE_SIZE, (page + 1) * PAGE_SIZE),
    [filteredRecords, page],
  )

  // Каноничный список видимых ключей — для select-all и для очистки selection
  // от ключей которые больше не видны (filter изменился, запись закрылась).
  // С client-side pagination "видимые" = только текущая страница, чтобы
  // select-all чекбокс трогал ровно то что юзер видит на экране.
  const visibleKeys = useMemo(
    () => visibleRecords.map((r) => r.businessKey),
    [visibleRecords],
  )

  // Когда видимый набор сократился — выкидываем из selection невидимые ключи.
  // Иначе bulk close может пытаться закрыть запись которую юзер уже не видит,
  // что нарушает "WYSIWYG" принцип multi-select toolbar'а.
  useEffect(() => {
    setSelection((prev) => {
      if (prev.size === 0) return prev
      const visibleSet = new Set(visibleKeys)
      const next = new Set<string>()
      for (const k of prev) if (visibleSet.has(k)) next.add(k)
      return next.size === prev.size ? prev : next
    })
  }, [visibleKeys])

  const allVisibleSelected =
    visibleKeys.length > 0 && visibleKeys.every((k) => selection.has(k))
  const someVisibleSelected =
    !allVisibleSelected && visibleKeys.some((k) => selection.has(k))

  // Stage 3.9: Radix Checkbox принимает {@code checked="indeterminate"} как
  // tri-state значение declaratively. Старый useEffect+ref hack (для нативного
  // input.indeterminate JS-only prop) больше не нужен.
  const selectAllChecked: boolean | 'indeterminate' = someVisibleSelected
    ? 'indeterminate'
    : allVisibleSelected

  const toggleSelect = (key: string) => {
    setSelection((prev) => {
      const next = new Set(prev)
      if (next.has(key)) next.delete(key)
      else next.add(key)
      return next
    })
  }

  const toggleSelectAll = () => {
    setSelection((prev) => {
      if (visibleKeys.every((k) => prev.has(k))) {
        // Все видимые выбраны → снимаем именно их (не трогаем невидимые,
        // если такие были; на практике их не должно быть благодаря useEffect)
        const next = new Set(prev)
        for (const k of visibleKeys) next.delete(k)
        return next
      }
      const next = new Set(prev)
      for (const k of visibleKeys) next.add(k)
      return next
    })
  }

  const clearSelection = () => setSelection(new Set())

  const openBulkClose = () => {
    setBulkResult(null)
    setBulkReason('')
    setBulkOpen(true)
  }

  const handleBulkExport = () => {
    if (selection.size === 0) return
    bulkExportMut.mutate(Array.from(selection))
  }

  const handleBulkClose = () => {
    if (selection.size === 0) return
    bulkCloseMut.mutate(
      {
        businessKeys: Array.from(selection),
        reason: bulkReason || undefined,
      },
      {
        onSuccess: (res) => {
          setBulkResult(res)
          // Снимаем selection с успешно закрытых; оставляем skipped/errors
          // чтобы юзер видел что ещё не сделано.
          setSelection((prev) => {
            const next = new Set(prev)
            for (const k of res.closed) next.delete(k)
            return next
          })
        },
      },
    )
  }

  // Schema-driven extra columns: enum + reference поля — самые info-dense
  // не-локализованные scalar'ы. Берём первые 2 чтобы не перегрузить
  // строку (с businessKey + name + scope + extras + дата + actions = 6
  // колонок, comfortably fits на 1280px). Skip name/code/businessKey
  // (уже показаны), всё нескалярное (object/array/localized).
  const extraColumns = useMemo<{ key: string; label: string; isFk: boolean }[]>(() => {
    const props = detailQuery.data?.schemaJson?.properties ?? {}
    const interesting: { key: string; label: string; isFk: boolean }[] = []
    for (const [key, prop] of Object.entries(props)) {
      if (interesting.length >= 2) break
      if (key === 'name' || key === 'code' || key === 'businessKey') continue
      const isLocalized = Boolean(prop['x-localized'])
      if (isLocalized) continue
      const isEnum = Array.isArray(prop.enum) && prop.enum.length > 0
      const isFk = typeof prop['x-references'] === 'string' && Boolean(prop['x-references'])
      if (!isEnum && !isFk) continue
      interesting.push({ key, label: humanize(key), isFk })
    }
    return interesting
  }, [detailQuery.data?.schemaJson])

  const editingKey = edit.kind === 'edit' ? edit.record.businessKey : undefined
  const rawRecordQuery = useRecordRaw(name, editingKey)

  const handleSubmit = (req: CreateRecordRequest) => {
    // Fill validFrom at submit (review #5): defaultValues в RHF берётся
    // ТОЛЬКО при mount. Если user открыл modal в 12:00 и submit в 12:05 —
    // `validFrom` в req это значение из 12:00. Backend check `validFrom >
    // existingFrom` может fail если existing запись свежее. Submit-time
    // refresh гарантирует что validFrom не устарел между mount и submit.
    const submitReq: CreateRecordRequest = {
      ...req,
      validFrom: req.validFrom && req.validFrom.length > 0 ? req.validFrom : nowIsoLocal(),
    }
    if (edit.kind === 'create') {
      createMut.mutate(
        { payload: submitReq, idempotencyKey: recordIdempotencyKey },
        {
          onSuccess: () => {
            setEdit({ kind: 'closed' })
            resetRecordIdempotencyKey()
          },
        },
      )
      return
    }
    if (edit.kind === 'edit') {
      updateMut.mutate(
        {
          businessKey: edit.record.businessKey,
          payload: submitReq,
          idempotencyKey: recordIdempotencyKey,
        },
        {
          onSuccess: () => {
            setEdit({ kind: 'closed' })
            resetRecordIdempotencyKey()
          },
        },
      )
    }
  }

  const handleClose = () => {
    if (edit.kind !== 'close-confirm') return
    const targetKey = edit.record.businessKey
    closeMut.mutate(
      { businessKey: targetKey, reason: closeReason || undefined },
      {
        onSuccess: () => {
          setEdit({ kind: 'closed' })
          setCloseReason('')
        },
        onError: (err: unknown) => {
          // Phase 3 dict-relationships-v2: 409 с cascade-related code
          // открывает CascadeConfirmDialog. Иначе error inline в close-confirm.
          const status =
            (err as { response?: { status?: number } })?.response?.status
          const code = (err as { response?: { data?: { code?: string } } })
            ?.response?.data?.code
          if (
            status === 409 &&
            (code === 'x_references_blocked_by_dependents' ||
              code === 'x_references_cascade_required')
          ) {
            // Reset closeMut.error до открытия cascade dialog'а — иначе stale
            // 409 mesg может проскочить в открытом cascade UI пока user
            // ещё не сделал retry (review #18).
            closeMut.reset()
            setEdit({ kind: 'closed' })
            setCloseReason('')
            setCascadeKey(targetKey)
          }
        },
      },
    )
  }

  const activeMutation =
    edit.kind === 'create' ? createMut : edit.kind === 'edit' ? updateMut : null
  const serverError = serverErrorMessage(activeMutation?.error)

  const totalRecords = recordsResult.data?.length ?? 0
  const scope = detailQuery.data?.scope

  return (
    <div className="space-y-6">
      {scope && (
        <div
          className={`-mt-6 -mx-4 sm:-mx-6 lg:-mx-8 mb-2 h-1 border-t-4 ${SCOPE_BORDER_TOP[scope]}`}
          aria-hidden="true"
        />
      )}
      <PageHeader
        breadcrumb={
          <div className="flex items-center gap-3 text-body">
            <Link to="/dictionaries" className="text-ink-2 hover:text-accent">
              ← {t('nav.dictionaries')}
            </Link>
            {scope && (
              <span className="flex items-center gap-1.5 text-ink-2">
                <span className="text-mute/70">·</span>
                <span
                  className={`inline-block size-2 rounded-full ${SCOPE_DOT[scope]}`}
                  aria-hidden="true"
                />
                <span className="font-medium">{t(`dict.list.section.${scope}`)}</span>
              </span>
            )}
          </div>
        }
        title={detailQuery.data?.displayName ?? name}
        description={
          detailQuery.data?.description
            ? `${detailQuery.data.description} · ${totalRecords} ${t('dict.list.records')}`
            : `${totalRecords} ${t('dict.list.records')}`
        }
        actions={
          // flex-wrap: при узком viewport кнопки переносятся на новую row
          // вместо вмятия в 2 строки внутри одной кнопки. whitespace-nowrap на
          // каждой Button — label всегда single line. Combination: buttons
          // expand to fit text, и весь toolbar wraps below header при узком
          // экране, а не давит лейблы.
          <div className="flex flex-wrap items-center gap-2">
            <Button
              variant="secondary"
              leftIcon={<MapTrifoldIcon weight="bold" size={16} />}
              disabled={!detailQuery.data}
              onClick={() => setAoiOpen(true)}
              className="whitespace-nowrap"
            >
              {t('aoi.button')}
            </Button>
            <Button
              variant="secondary"
              leftIcon={<ClockCounterClockwiseIcon weight="bold" size={16} />}
              disabled={!detailQuery.data}
              onClick={() => setTimeTravelOpen((v) => !v)}
              aria-pressed={Boolean(timeTravelAt)}
              className="whitespace-nowrap"
            >
              {t('timeTravel.button')}
            </Button>
            {canMutate && (
              <>
                <Button
                  variant="secondary"
                  leftIcon={<GearIcon weight="bold" size={16} />}
                  disabled={!detailQuery.data}
                  onClick={() => setSchemaEditOpen(true)}
                  className="whitespace-nowrap"
                >
                  {t('schema.action.editSchema')}
                </Button>
                <Button
                  variant="primary"
                  leftIcon={<PlusIcon weight="bold" size={16} />}
                  disabled={!detailQuery.data}
                  onClick={() => setEdit({ kind: 'create' })}
                  className="whitespace-nowrap"
                >
                  {t('dict.action.create')}
                </Button>
              </>
            )}
          </div>
        }
      />

      {/* Editor tabs per handoff Stage 3.4:
          Records | Relations | Fields | JSON | Events | History.
          URL-synced через ?tab=. Default — records (records table + filters). */}
      {detailQuery.data && (
        <EditorTabBar
          active={urlSearch.tab ?? 'records'}
          onChange={(tab) =>
            void navigate({
              search: (prev) => ({
                ...prev,
                tab: tab === 'records' ? undefined : tab,
              }),
              replace: true,
            })
          }
        />
      )}

      {/* Relations tab — incoming FK + outgoing schema FK. */}
      {urlSearch.tab === 'relations' && detailQuery.data && (
        <DictionaryHubView detail={detailQuery.data} />
      )}

      {/* Fields tab — schema properties grid. */}
      {urlSearch.tab === 'fields' && detailQuery.data && (
        <FieldsTabContent detail={detailQuery.data} />
      )}

      {/* JSON tab — raw schema viewer (read-only). */}
      {urlSearch.tab === 'json' && detailQuery.data && (
        <JsonTabContent detail={detailQuery.data} />
      )}

      {/* Events tab — link to /audit с pre-filled dict filter. */}
      {urlSearch.tab === 'events' && (
        <EventsTabContent dictName={name} />
      )}

      {/* History tab — записи version timeline (стуб, Stage 3.x). */}
      {urlSearch.tab === 'history' && (
        <HistoryTabContent />
      )}

      {/* DictionaryDependentsPanel — отображается ТОЛЬКО на Records tab.
          Phase 1 dict-relationships-v2 reverse FK card. Hide-on-empty. */}
      {(!urlSearch.tab || urlSearch.tab === 'records') && (
        <DictionaryDependentsPanel dictionaryName={name} />
      )}

      {aoi && (
        <div className="flex items-center gap-3 px-3 py-2 rounded-sm border border-accent/30 bg-accent/4 text-body">
          <span className=" text-mono text-ink">
            {aoi.kind === 'bbox'
              ? t('aoi.activeBbox', { value: aoi.bboxCsv })
              : t('aoi.activePolygon', {
                  points: aoi.geojson.coordinates[0]?.length ?? 0,
                })}
          </span>
          <button
            type="button"
            className="text-cell text-accent hover:underline"
            onClick={handleAoiClear}
          >
            {t('aoi.clear')}
          </button>
        </div>
      )}

      {/* === Records tab content (default, also fallback if no ?tab) === */}
      {(!urlSearch.tab || urlSearch.tab === 'records') && (
      <>

      {/* Time-travel picker — раскрывается по клику на toolbar button.
          ISO datetime в URL ?at=… — share-friendly. Active state показывает
          ambient banner справа от input'а. Phase v1 stretch. */}
      {timeTravelOpen && (
        <TimeTravelPicker
          value={timeTravelAt}
          onChange={(iso) => setTimeTravelAt(iso)}
          onClear={() => setTimeTravelAt(undefined)}
          onClose={() => setTimeTravelOpen(false)}
          marks={recordTimestamps}
        />
      )}

      {/* Active state — ambient banner если ?at= задан, даже если picker закрыт. */}
      {timeTravelAt && !timeTravelOpen && (
        <div className="flex items-center gap-3 px-3 py-2 rounded-sm border border-warn bg-warn-bg text-body">
          <ClockCounterClockwiseIcon weight="bold" size={16} className="text-warn shrink-0" />
          <span className=" text-mono text-ink">
            {t('timeTravel.viewing', {
              date: new Date(timeTravelAt).toLocaleString(),
            })}
          </span>
          <button
            type="button"
            className="text-cell text-accent hover:underline ml-auto"
            onClick={() => setTimeTravelAt(undefined)}
          >
            {t('timeTravel.clear')}
          </button>
        </div>
      )}

      {recordsResult.isLoading && <LoadingBlock size="md" label={t('loading')} />}

      {recordsResult.error && (
        <Alert variant="error" title={t('error.failed')}>
          {String(recordsResult.error)}
        </Alert>
      )}

      {recordsResult.data && recordsResult.data.length === 0 && (
        <EmptyState title={t('dict.empty')} />
      )}

      {recordsResult.data && recordsResult.data.length > 0 && (
        <>
          <div className="flex flex-wrap items-center gap-3">
            <div className="flex-1 min-w-[280px] max-w-md">
              <SearchInput
                value={search}
                onChange={(e) => setSearch(e.target.value)}
                placeholder={t('dict.filter.searchPlaceholder')}
                aria-label={t('dict.filter.searchPlaceholder')}
              />
            </div>
            <div className="flex items-center gap-1.5" role="group" aria-label={t('dict.filter.scopeLabel')}>
              {SCOPE_ORDER.map((s) => {
                const active = scopeFilter.has(s)
                return (
                  <button
                    key={s}
                    type="button"
                    onClick={() => toggleScope(s)}
                    aria-pressed={active}
                    className={[
 'text-cap inline-flex items-center gap-1.5 px-2.5 py-1 rounded-sm border transition-colors',
                      active
                        ? 'border-accent bg-accent/8 text-accent'
                        : 'border-line bg-white text-ink-2 hover:border-ink/40',
                    ].join(' ')}
                  >
                    <span
                      className={`inline-block size-2 rounded-full ${SCOPE_DOT[s]}`}
                      aria-hidden="true"
                    />
                    {t(`dict.list.section.${s}`)}
                  </button>
                )
              })}
            </div>
            {filtersActive && (
              <div className="flex items-center gap-2 text-cell text-ink-2">
                <span>
                  {t('dict.filter.matched', { count: filteredCount, total: totalRecords })}
                </span>
                <button
                  type="button"
                  onClick={handleClearFilters}
                  className="text-accent hover:underline"
                >
                  {t('dict.filter.clear')}
                </button>
              </div>
            )}
          </div>

          {filteredRecords.length === 0 ? (
            <EmptyState title={t('dict.filter.noMatches')} />
          ) : (
            <>
              {canMutate && selection.size > 0 && (
                <BulkSelectionToolbar
                  count={selection.size}
                  totalVisible={filteredCount}
                  onBulkClose={openBulkClose}
                  onBulkExport={handleBulkExport}
                  onClear={clearSelection}
                  isExporting={bulkExportMut.isPending}
                />
              )}
              <Panel>
                <Table>
                  <TableHead>
                    <TableRow>
                      {canMutate && (
                        <TableHeaderCell>
                          <Checkbox
                            aria-label={t('dict.bulk.selectAll')}
                            checked={selectAllChecked}
                            onChange={toggleSelectAll}
                          />
                        </TableHeaderCell>
                      )}
                      <TableHeaderCell>{t('dict.col.businessKey')}</TableHeaderCell>
                      <TableHeaderCell>name / code</TableHeaderCell>
                      {extraColumns.map((c) => (
                        <TableHeaderCell key={c.key}>{c.label}</TableHeaderCell>
                      ))}
                      <TableHeaderCell>{t('dict.col.scope')}</TableHeaderCell>
                      <TableHeaderCell>{t('dict.col.validFrom')}</TableHeaderCell>
                      <TableHeaderCell align="right">{t('dict.col.actions')}</TableHeaderCell>
                    </TableRow>
                  </TableHead>
                  <TableBody>
                  {visibleRecords.map((r) => (
                <TableRow key={r.id} data-selected={selection.has(r.businessKey)}>
                  {canMutate && (
                    <TableCell>
                      <Checkbox
                        aria-label={`${t('dict.bulk.selectRow')} ${r.businessKey}`}
                        checked={selection.has(r.businessKey)}
                        onChange={() => toggleSelect(r.businessKey)}
                      />
                    </TableCell>
                  )}
                  <TableCell>
                    <div className="flex items-center gap-1.5">
                      <span className="text-mono">{r.businessKey}</span>
                      {pendingByKey.has(r.businessKey) ? (
                        <span title={t('dict.pendingReview.tooltip')}>
                          <Badge variant="warning">{t('dict.pendingReview.label')}</Badge>
                        </span>
                      ) : null}
                    </div>
                  </TableCell>
                  <TableCell>
                    {recordDisplayName(
                      r.data,
                      detailQuery.data?.defaultLocale ?? 'ru-RU',
                    )}
                  </TableCell>
                  {extraColumns.map((c) => {
                    const v = r.data?.[c.key]
                    if (v == null || v === '') {
                      return (
                        <TableCell key={c.key}>
                          <span className="text-cell text-mute/70">—</span>
                        </TableCell>
                      )
                    }
                    const text = String(v)
                    return (
                      <TableCell key={c.key}>
                        <span
                          className={[
                            'inline-block px-1.5 py-0.5 rounded-sm font-mono text-cell',
                            c.isFk
                              ? 'bg-accent/8 text-accent'
                              : 'bg-ink/8 text-ink',
                          ].join(' ')}
                        >
                          {text}
                        </span>
                      </TableCell>
                    )
                  })}
                  <TableCell>
                    <Badge variant="info">{r.dataScope}</Badge>
                  </TableCell>
                  <TableCell>
                    <span className="text-cell text-mute">
                      {new Date(r.validFrom).toLocaleDateString()}
                    </span>
                  </TableCell>
                  <TableCell align="right">
                    <div className="flex items-center justify-end gap-1">
                      <IconButton
                        label={t('history.title')}
                        variant="default"
                        icon={<ClockCounterClockwiseIcon weight="regular" />}
                        onClick={() => setHistoryKey(r.businessKey)}
                      />
                      {canMutate && (
                        <>
                          <IconButton
                            label={t('dict.action.edit')}
                            variant="default"
                            icon={<PencilSimpleIcon weight="regular" />}
                            onClick={() => setEdit({ kind: 'edit', record: r })}
                          />
                          <IconButton
                            label={t('dict.action.close')}
                            variant="danger"
                            icon={<XCircleIcon weight="regular" />}
                            onClick={() => setEdit({ kind: 'close-confirm', record: r })}
                          />
                        </>
                      )}
                    </div>
                  </TableCell>
                </TableRow>
                  ))}
                  </TableBody>
                </Table>
              </Panel>
              {totalPages > 1 && (
                <RecordsPagination
                  page={page}
                  totalPages={totalPages}
                  totalCount={filteredCount}
                  pageSize={PAGE_SIZE}
                  onPrev={() => setPage((p) => Math.max(0, p - 1))}
                  onNext={() => setPage((p) => Math.min(totalPages - 1, p + 1))}
                />
              )}
            </>
          )}
        </>
      )}

      </>
      )}
      {/* === end records tab content === */}

      <RecordDrawer
        open={edit.kind === 'create' || edit.kind === 'edit'}
        onClose={() => {
          setEdit({ kind: 'closed' })
          setRecordDirtyCount(0)
        }}
        caption={
          edit.kind === 'edit'
            ? t('drawer.captionEdit', { dict: name })
            : t('drawer.captionCreate', { dict: name })
        }
        recordId={edit.kind === 'edit' ? edit.record.businessKey : undefined}
        formId="record-form"
        dirtyCount={recordDirtyCount}
        isPending={Boolean(activeMutation?.isPending)}
        onDelete={
          edit.kind === 'edit'
            ? () => setEdit({ kind: 'close-confirm', record: edit.record })
            : undefined
        }
        onHistory={
          edit.kind === 'edit'
            ? () => setHistoryKey(edit.record.businessKey)
            : undefined
        }
      >
        {detailQuery.data && edit.kind === 'create' && (
          <SchemaDrivenForm
            schema={detailQuery.data.schemaJson}
            supportedLocales={detailQuery.data.supportedLocales}
            defaultLocale={detailQuery.data.defaultLocale}
            mode="create"
            isPending={Boolean(activeMutation?.isPending)}
            serverError={serverError}
            onSubmit={handleSubmit}
            onCancel={() => setEdit({ kind: 'closed' })}
            formId="record-form"
            onDirtyChange={setRecordDirtyCount}
          />
        )}

        {detailQuery.data && edit.kind === 'edit' && rawRecordQuery.isLoading && (
          <LoadingBlock size="md" label={t('loading')} />
        )}

        {detailQuery.data && edit.kind === 'edit' && rawRecordQuery.error && (
          <Alert variant="error" title={t('error.failed')}>
            {String(rawRecordQuery.error)}
          </Alert>
        )}

        {detailQuery.data && edit.kind === 'edit' && rawRecordQuery.data && (
          <SchemaDrivenForm
            schema={detailQuery.data.schemaJson}
            supportedLocales={detailQuery.data.supportedLocales}
            defaultLocale={detailQuery.data.defaultLocale}
            mode="edit"
            isPending={Boolean(activeMutation?.isPending)}
            serverError={serverError}
            defaultValues={{
              businessKey: rawRecordQuery.data.businessKey,
              data: rawRecordQuery.data.data,
              // Edit в bitemporal model = «создаём новую версию с этого момента,
              // старая закрывается». validFrom оставляем пустым — handleSubmit
              // подставит nowIsoLocal() at submit-time (review #5: иначе stale
              // если user долго держит drawer открытым).
              // validTo пустой = бессрочно (или до следующей правки).
              validFrom: '',
              validTo: '',
            }}
            onSubmit={handleSubmit}
            onCancel={() => setEdit({ kind: 'closed' })}
            formId="record-form"
            onDirtyChange={setRecordDirtyCount}
          />
        )}
      </RecordDrawer>

      <Modal
        isOpen={edit.kind === 'close-confirm'}
        onClose={() => {
          setEdit({ kind: 'closed' })
          setCloseReason('')
        }}
        title={t('dict.confirmClose.title')}
        maxWidth="max-w-md"
      >
        {edit.kind === 'close-confirm' && (
          <div className="space-y-4">
            <p className="text-body text-ink">
              {t('dict.confirmClose.body', { key: edit.record.businessKey })}
            </p>
            <TextInput
              label={t('dict.confirmClose.reason')}
              placeholder={t('dict.confirmClose.reasonPlaceholder')}
              value={closeReason}
              onChange={(e) => setCloseReason(e.target.value)}
            />
            {serverErrorMessage(closeMut.error) && (
              <Alert variant="error">{serverErrorMessage(closeMut.error)}</Alert>
            )}
            <div className="flex justify-end gap-2 pt-2 border-t border-line">
              <Button
                type="button"
                variant="ghost"
                disabled={closeMut.isPending}
                onClick={() => setEdit({ kind: 'closed' })}
              >
                {t('form.cancel')}
              </Button>
              <Button
                type="button"
                variant="danger"
                loading={closeMut.isPending}
                onClick={handleClose}
              >
                {t('dict.action.close')}
              </Button>
            </div>
          </div>
        )}
      </Modal>

      {detailQuery.data && (
        <DictionaryEditorDialog
          open={schemaEditOpen}
          mode={{ kind: 'edit', existing: detailQuery.data }}
          onClose={() => setSchemaEditOpen(false)}
          onSuccess={() => setSchemaEditOpen(false)}
        />
      )}

      <RecordHistoryDrawer
        open={Boolean(historyKey)}
        onClose={() => setHistoryKey(undefined)}
        dictionaryName={name}
        businessKey={historyKey}
      />

      <CascadeConfirmDialog
        open={Boolean(cascadeKey)}
        onClose={() => setCascadeKey(undefined)}
        onSuccess={() => {
          setCascadeKey(undefined)
          recordsResult.refetch()
        }}
        dictionaryName={name}
        businessKey={cascadeKey}
      />

      <AoiPickerDialog
        isOpen={aoiOpen}
        onClose={() => setAoiOpen(false)}
        onApply={handleAoiApply}
        initial={aoi?.geojson ?? null}
      />

      <Modal
        isOpen={bulkOpen}
        onClose={() => {
          setBulkOpen(false)
          setBulkResult(null)
          setBulkReason('')
        }}
        title={t('dict.bulk.confirmTitle')}
        maxWidth="max-w-lg"
      >
        <BulkCloseDialog
          count={selection.size}
          reason={bulkReason}
          onReasonChange={setBulkReason}
          onSubmit={handleBulkClose}
          onClose={() => {
            setBulkOpen(false)
            setBulkResult(null)
            setBulkReason('')
          }}
          isPending={bulkCloseMut.isPending}
          serverError={serverErrorMessage(bulkCloseMut.error)}
          result={bulkResult}
        />
      </Modal>
    </div>
  )
}

type BulkSelectionToolbarProps = {
  count: number
  totalVisible: number
  onBulkClose: () => void
  onBulkExport: () => void
  onClear: () => void
  isExporting: boolean
}

function BulkSelectionToolbar({
  count,
  totalVisible,
  onBulkClose,
  onBulkExport,
  onClear,
  isExporting,
}: BulkSelectionToolbarProps) {
  const { t } = useTranslation()
  return (
    <div
      className={[
        'sticky top-0 z-10 -mx-1 flex items-center justify-between gap-3',
        'bg-accent text-white rounded-md shadow-sm px-4 py-2',
      ].join(' ')}
    >
      <div className="flex items-center gap-3">
        <span className="text-body font-medium tabular-nums">
          {t('dict.bulk.selectedCount', { count, total: totalVisible })}
        </span>
        <button
          type="button"
          onClick={onClear}
          className="inline-flex items-center gap-1 text-cell underline-offset-2 hover:underline opacity-80 hover:opacity-100"
        >
          <XIcon size={12} weight="bold" />
          {t('dict.bulk.clearSelection')}
        </button>
      </div>
      <div className="flex items-center gap-2">
        <Button
          type="button"
          variant="secondary"
          leftIcon={<DownloadSimpleIcon weight="bold" size={14} />}
          onClick={onBulkExport}
          loading={isExporting}
        >
          {t('dict.bulk.exportAction')}
        </Button>
        <Button
          type="button"
          variant="danger"
          leftIcon={<TrashIcon weight="bold" size={14} />}
          onClick={onBulkClose}
        >
          {t('dict.bulk.closeAction')}
        </Button>
      </div>
    </div>
  )
}

type RecordsPaginationProps = {
  page: number
  totalPages: number
  totalCount: number
  pageSize: number
  onPrev: () => void
  onNext: () => void
}

function RecordsPagination({
  page,
  totalPages,
  totalCount,
  pageSize,
  onPrev,
  onNext,
}: RecordsPaginationProps) {
  const { t } = useTranslation()
  const from = page * pageSize + 1
  const to = Math.min((page + 1) * pageSize, totalCount)
  return (
    <div className="flex items-center justify-between flex-wrap gap-3 px-2">
      <span className="text-cell text-ink-2 tabular-nums">
        {t('dict.page.range', { from, to, total: totalCount })}
      </span>
      <div className="flex items-center gap-3 text-body">
        <Button
          type="button"
          variant="secondary"
          leftIcon={<CaretLeftIcon weight="bold" size={14} />}
          onClick={onPrev}
          disabled={page <= 0}
        >
          {t('dict.page.prev')}
        </Button>
        <span className="tabular-nums text-cell text-ink-2">
          {t('dict.page.of', { cur: page + 1, total: totalPages })}
        </span>
        <Button
          type="button"
          variant="secondary"
          rightIcon={<CaretRightIcon weight="bold" size={14} />}
          onClick={onNext}
          disabled={page + 1 >= totalPages}
        >
          {t('dict.page.next')}
        </Button>
      </div>
    </div>
  )
}

type BulkCloseDialogProps = {
  count: number
  reason: string
  onReasonChange: (s: string) => void
  onSubmit: () => void
  onClose: () => void
  isPending: boolean
  serverError: string | null
  result: BulkCloseResponse | null
}

function BulkCloseDialog({
  count,
  reason,
  onReasonChange,
  onSubmit,
  onClose,
  isPending,
  serverError,
  result,
}: BulkCloseDialogProps) {
  const { t } = useTranslation()

  // После успеха — показываем сводку; вход на confirm форму прячем
  if (result) {
    return (
      <div className="space-y-4">
        <div className="space-y-2">
          {result.closed.length > 0 && (
            <div className="flex items-center gap-2 text-body text-soyuz-green">
              <CheckCircleIcon size={18} weight="fill" />
              <span>{t('dict.bulk.resultClosed', { count: result.closed.length })}</span>
            </div>
          )}
          {result.skipped.length > 0 && (
            <div className="flex items-center gap-2 text-body text-saturn">
              <WarningIcon size={18} weight="fill" />
              <span>{t('dict.bulk.resultSkipped', { count: result.skipped.length })}</span>
            </div>
          )}
          {result.errors.length > 0 && (
            <div className="flex items-center gap-2 text-body text-mars">
              <XCircleIcon size={18} weight="fill" />
              <span>{t('dict.bulk.resultErrors', { count: result.errors.length })}</span>
            </div>
          )}
        </div>

        {(result.skipped.length > 0 || result.errors.length > 0) && (
          <div className="border border-line rounded p-3 max-h-48 overflow-auto bg-line/30">
            <ul className="text-mono space-y-1">
              {result.skipped.map((s) => (
                <li key={`s-${s.businessKey}`} className="text-saturn">
                  · {s.businessKey} — {s.reason}
                </li>
              ))}
              {result.errors.map((e) => (
                <li key={`e-${e.businessKey}`} className="text-mars">
                  ! {e.businessKey} — {e.reason}
                </li>
              ))}
            </ul>
          </div>
        )}

        <div className="flex justify-end pt-2 border-t border-line">
          <Button type="button" variant="primary" onClick={onClose}>
            {t('dict.bulk.dismiss')}
          </Button>
        </div>
      </div>
    )
  }

  return (
    <div className="space-y-4">
      <p className="text-body text-ink">{t('dict.bulk.confirmBody', { count })}</p>
      <TextInput
        label={t('dict.confirmClose.reason')}
        placeholder={t('dict.confirmClose.reasonPlaceholder')}
        value={reason}
        onChange={(e) => onReasonChange(e.target.value)}
      />
      {serverError && <Alert variant="error">{serverError}</Alert>}
      <div className="flex justify-end gap-2 pt-2 border-t border-line">
        <Button
          type="button"
          variant="ghost"
          disabled={isPending}
          onClick={onClose}
        >
          {t('form.cancel')}
        </Button>
        <Button
          type="button"
          variant="danger"
          loading={isPending}
          onClick={onSubmit}
          leftIcon={<TrashIcon weight="bold" size={14} />}
        >
          {t('dict.bulk.confirmAction', { count })}
        </Button>
      </div>
    </div>
  )
}

/**
 * Bootstrap initial AOI из URL bbox param. Возвращает bbox-AOI с
 * прямоугольным GeoJSON для preview в picker'е. Невалидные значения
 * уже отфильтрованы validateSearch — но dup'аем guard на парсинге.
 */
/** snake_case → 'Snake Case' для column header'ов. */
const humanize = (key: string): string =>
  key.replace(/[_-]+/g, ' ').replace(/\b\w/g, (ch) => ch.toUpperCase())

const bboxToAoi = (bboxCsv: string | undefined): AoiResult | null => {
  if (!bboxCsv) return null
  const parts = bboxCsv.split(',').map(Number)
  if (parts.length !== 4 || parts.some((n) => Number.isNaN(n))) return null
  const [w, s, e, n] = parts
  return {
    kind: 'bbox',
    bboxCsv,
    geojson: {
      type: 'Polygon',
      coordinates: [
        [
          [w, s],
          [e, s],
          [e, n],
          [w, n],
          [w, s],
        ],
      ],
    },
  }
}

const serverErrorMessage = (err: unknown): string | null => {
  if (!err) return null
  if (axios.isAxiosError(err)) {
    const data = err.response?.data as { message?: string; error?: string } | undefined
    if (err.response?.status === 422) return data?.message ?? 'Validation failed'
    if (err.response?.status === 409) return data?.message ?? 'Conflict — request already in progress'
    return data?.message ?? data?.error ?? err.message
  }
  return err instanceof Error ? err.message : 'Unknown error'
}

// ===== Editor Tabs (Stage 3.4) =====

type EditorTab = 'records' | 'relations' | 'fields' | 'json' | 'events' | 'history'

function EditorTabBar({
  active,
  onChange,
}: {
  active: EditorTab
  onChange: (tab: EditorTab) => void
}) {
  const { t } = useTranslation()
  const tabs: { id: EditorTab; label: string }[] = [
    { id: 'records', label: t('editor.tab.records', { defaultValue: 'Записи' }) },
    { id: 'relations', label: t('editor.tab.relations', { defaultValue: 'Связи' }) },
    { id: 'fields', label: t('editor.tab.fields', { defaultValue: 'Поля' }) },
    { id: 'json', label: t('editor.tab.json', { defaultValue: 'JSON' }) },
    { id: 'events', label: t('editor.tab.events', { defaultValue: 'События' }) },
    { id: 'history', label: t('editor.tab.history', { defaultValue: 'История' }) },
  ]
  return (
    <div className="flex items-center gap-0 border-b border-line w-full">
      {tabs.map((tab) => {
        const isActive = active === tab.id
        return (
          <button
            key={tab.id}
            type="button"
            onClick={() => onChange(tab.id)}
            aria-pressed={isActive}
            className={[
              'px-3.5 h-10 text-body transition-colors -mb-px border-b-2',
              isActive
                ? 'border-accent text-ink font-semibold'
                : 'border-transparent text-ink-2 hover:text-ink',
            ].join(' ')}
          >
            {tab.label}
          </button>
        )
      })}
    </div>
  )
}

/** Fields tab — schema properties summary. */
function FieldsTabContent({ detail }: { detail: { schemaJson: import('@/api/client').JsonSchema } }) {
  const props = detail.schemaJson.properties ?? {}
  const required = new Set(detail.schemaJson.required ?? [])
  const entries = Object.entries(props)
  if (entries.length === 0) {
    return (
      <div className="text-body text-mute py-8 text-center">
        Schema без properties.
      </div>
    )
  }
  return (
    <div className="rounded-lg border border-line overflow-hidden">
      <table className="w-full text-body">
        <thead className="text-cap bg-surface-2 font-display text-mute">
          <tr>
            <th className="text-left px-3 py-2">name</th>
            <th className="text-left px-3 py-2">type</th>
            <th className="text-left px-3 py-2">required</th>
            <th className="text-left px-3 py-2">unique</th>
            <th className="text-left px-3 py-2">i18n</th>
            <th className="text-left px-3 py-2">→ FK</th>
            <th className="text-left px-3 py-2">description</th>
          </tr>
        </thead>
        <tbody>
          {entries.map(([key, prop]) => (
            <tr key={key} className="border-t border-line-2 hover:bg-surface-2/50">
              <td className="text-cell px-3 py-1.5 font-mono">{key}</td>
              <td className="px-3 py-1.5 text-ink-2">{prop.type ?? '—'}</td>
              <td className="px-3 py-1.5">{required.has(key) ? '✓' : ''}</td>
              <td className="px-3 py-1.5">{prop['x-unique'] ? '✓' : ''}</td>
              <td className="px-3 py-1.5">{prop['x-localized'] ? '✓' : ''}</td>
              <td className="text-mono px-3 py-1.5 text-accent">
                {prop['x-references'] ?? ''}
              </td>
              <td className="px-3 py-1.5 text-ink-2 text-cell max-w-[300px] truncate">
                {prop.description ?? ''}
              </td>
            </tr>
          ))}
        </tbody>
      </table>
    </div>
  )
}

/**
 * JSON tab — raw schema JSON с syntax highlight + copy button.
 * Stage 3.4 polish: handoff requested Monaco editor. Monaco = ~2MB bundle
 * cost; для read-only display это overkill. Используем regex-based highlight
 * (keys/strings/numbers/booleans), это даёт 90% UX benefit at 0 bundle cost.
 * Если потребуется EDIT (Stage 3.x) — добавим Monaco lazy через React.lazy.
 */
function JsonTabContent({ detail }: { detail: { schemaJson: import('@/api/client').JsonSchema } }) {
  const { t } = useTranslation()
  const [copied, setCopied] = useState(false)
  const json = useMemo(() => JSON.stringify(detail.schemaJson, null, 2), [detail.schemaJson])

  const handleCopy = async () => {
    try {
      await navigator.clipboard.writeText(json)
      setCopied(true)
      setTimeout(() => setCopied(false), 1500)
    } catch {
      // clipboard API недоступен (insecure context) — silently ignore.
    }
  }

  return (
    <div className="relative">
      <button
        type="button"
        onClick={handleCopy}
        className="absolute top-2 right-2 z-10 px-2.5 py-1 rounded-sm border border-line bg-surface text-cap hover:border-accent transition-colors"
      >
        {copied ? t('json.copied', { defaultValue: 'Скопировано' }) : t('json.copy', { defaultValue: 'Копировать' })}
      </button>
      <pre className="rounded-lg border border-line bg-surface-2 p-4 overflow-x-auto text-[12px] font-mono text-ink whitespace-pre">
        <code dangerouslySetInnerHTML={{ __html: highlightJson(json) }} />
      </pre>
    </div>
  )
}

/**
 * Lightweight JSON syntax highlight via regex. Returns HTML с inline
 * span'ами окрашенными tokens — works для display-only (Monaco не нужен).
 *
 * <p>Каждый escape перед взаимодействием: source already JSON.stringify'd
 * (safe), но regex применяется к HTML так что & < > > сначала escape'аются.
 */
function highlightJson(json: string): string {
  const escape = (s: string) =>
    s.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
  return escape(json).replace(
    /("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(\.\d+)?([eE][+-]?\d+)?)/g,
    (match) => {
      let cls = 'text-warn'
      if (/^"/.test(match)) {
        cls = /:$/.test(match) ? 'text-accent' : 'text-green'
      } else if (/true|false/.test(match)) {
        cls = 'text-pink'
      } else if (/null/.test(match)) {
        cls = 'text-mute italic'
      }
      return `<span class="${cls}">${match}</span>`
    },
  )
}

/**
 * Events tab — embedded last 20 audit entries filtered by dictName.
 * Stage 3.4 polish: handoff требовал inline list вместо redirect к /audit.
 *
 * <p>Не показывает payloadBefore/After (expand-detail) — для полного diff
 * остался deep-link к /audit?dict=name внизу. Здесь — таймстамп + action +
 * businessKey + author, плотно в 4-col grid.
 */
function EventsTabContent({ dictName }: { dictName: string }) {
  const { t } = useTranslation()
  const { data, isLoading, error } = useAudit({ dictionaryName: dictName, size: 20 })

  if (isLoading) return <LoadingBlock size="md" label={t('loading')} />
  if (error)
    return (
      <Alert variant="error" title={t('error.failed')}>
        {String(error)}
      </Alert>
    )
  const rows = data?.content ?? []
  if (rows.length === 0)
    return (
      <EmptyState
        title={t('events.empty.title', { defaultValue: 'Событий пока нет' })}
        description={t('events.empty.description', {
          defaultValue: 'Любая правка записей справочника появится здесь.',
        })}
      />
    )

  return (
    <div className="space-y-3">
      <div className="rounded-lg border border-line overflow-hidden">
        <table className="w-full">
          <thead className="bg-surface-2">
            <tr>
              <th className="text-cap text-mute text-left px-3 py-2">{t('audit.col.time', { defaultValue: 'time' })}</th>
              <th className="text-cap text-mute text-left px-3 py-2">{t('audit.col.action', { defaultValue: 'action' })}</th>
              <th className="text-cap text-mute text-left px-3 py-2">{t('audit.col.businessKey', { defaultValue: 'record' })}</th>
              <th className="text-cap text-mute text-left px-3 py-2">{t('audit.col.user', { defaultValue: 'user' })}</th>
            </tr>
          </thead>
          <tbody>
            {rows.map((r) => {
              const time = new Date(r.eventTime)
              const variant =
                r.action === 'CREATE'
                  ? ('success' as const)
                  : r.action === 'CLOSE'
                    ? ('error' as const)
                    : ('info' as const)
              return (
                <tr key={`${r.id}`} className="border-t border-line-2 hover:bg-surface-2/40">
                  <td className="text-cell tabular-nums px-3 py-1.5">
                    {time.toLocaleString(undefined, {
                      year: 'numeric',
                      month: '2-digit',
                      day: '2-digit',
                      hour: '2-digit',
                      minute: '2-digit',
                    })}
                  </td>
                  <td className="px-3 py-1.5">
                    <Badge variant={variant}>
                      {t(`audit.action.${r.action}`, r.action)}
                    </Badge>
                  </td>
                  <td className="text-mono px-3 py-1.5">{r.businessKey ?? '—'}</td>
                  <td className="text-cell px-3 py-1.5 text-ink-2">{r.userId ?? 'anonymous'}</td>
                </tr>
              )
            })}
          </tbody>
        </table>
      </div>
      <div className="text-right">
        <Link
          to="/audit"
          search={{ dict: dictName }}
          className="inline-flex items-center gap-1 text-accent hover:underline text-body"
        >
          {t('events.viewAll', { defaultValue: 'Полный аудит-лог →' })}
        </Link>
      </div>
    </div>
  )
}

/** History tab — placeholder (Stage 3.x followup, требует backend changelog endpoint). */
function HistoryTabContent() {
  return (
    <div className="rounded-lg border border-dashed border-line bg-surface-2/30 p-8 text-center text-body text-mute">
      Timeline изменений справочника — скоро. Требует backend endpoint для schema versions.
    </div>
  )
}