/**
 * Übungssuche mit Volltext-, KI-/Semantikfeld (aktuell gleiche Engine wie Suche) und erweiterten Filtern.
 * Paginierung bis max. 100 Treffer pro Request (API-Limit).
 */
import React, { useState, useEffect, useMemo, useCallback, useRef } from 'react'
import { useVirtualizer } from '@tanstack/react-virtual'
import api from '../utils/api'
import { useAuth } from '../context/AuthContext'
import { SKILL_LEVEL_OPTIONS } from '../constants/skillLevels'
import { EXERCISE_VISIBILITY_FIELD_LABEL } from '../constants/exerciseGovernanceLabels'
import {
  INITIAL_EXERCISE_LIST_FILTERS,
  mergeExerciseListPrefsFromApi,
  splitMnCatalogRules,
  splitScalarCatalogRules,
} from '../constants/exerciseListFilters'
import SkillTreeMultiSelect from './SkillTreeMultiSelect'
import ExerciseFocusRulePicker from './ExerciseFocusRulePicker'
import CatalogRulePicker from './CatalogRulePicker'
import ExerciseAiSuggestPreviewModal from './ExerciseAiSuggestPreviewModal'
import ExerciseAiQuickCreateOffer, { ExerciseAiQuickCreateTeaser } from './ExerciseAiQuickCreateOffer'
import { useExerciseAiQuickCreateFields } from '../hooks/useExerciseAiQuickCreateFields'
import {
  buildQuickCreateAiPreview,
  buildQuickCreateExercisePayloadFromDraft,
  aiPreviewToQuickCreateDraft,
} from '../utils/exerciseAiQuickCreate'
import { resolveExercisePickVariantId } from '../utils/exercisePlanningPick'
import { buildPickerPlanningContextForAi } from '../utils/planningContextForExerciseAi'

const PAGE_SIZE = 100
/** Backend POST /api/planning/exercise-suggest erlaubt max. 50 */
const PLANNING_SUGGEST_LIMIT = 50
/** Client-Hinweis — Backend entscheidet final über LLM-Gates (max. 1 Call). */
const PLANNING_LLM_INTENT_MIN_CHARS = 10
const LEVEL_FILTER_OPTS = SKILL_LEVEL_OPTIONS.filter((o) => o.level != null)

const INITIAL_FILTERS = { ...INITIAL_EXERCISE_LIST_FILTERS }

export default function ExercisePickerModal({
  open,
  onClose,
  onSelectExercise,
  multiSelect = false,
  onSelectExercises = null,
  enableQuickCreateDraft = false,
  /** Gespeicherte training_units.id — aktiviert Planungs-KI (robuster als nur planningContext). */
  planningUnitId = null,
  /** 'planning' = Planungs-KI-API; 'library' = Volltext-Bibliothek */
  pickerMode = 'library',
  /** Planungs-KI auch ohne gespeicherte unit_id (Client-Kontext / Freitext). */
  enableFreePlanningSearch = false,
  /** true auf TrainingUnitEditPage: Hinweis wenn Planungs-KI ohne Einheit und ohne Freitext. */
  expectPlanningSearch = false,
  /** Planungs-Kontext für KI-Suche (Abschnitt, Anker, Plan …) */
  planningContext = null,
  /** Wenn gesetzt: z. B. ['simple'] oder ['combination'] — sonst alle Übungsarten */
  exerciseKindAny = undefined,
}) {
  const { user } = useAuth()
  const [catalogs, setCatalogs] = useState({
    focusAreas: [],
    styleDirections: [],
    trainingTypes: [],
    targetGroups: [],
    skills: [],
  })
  const [catalogsReady, setCatalogsReady] = useState(false)
  const [searchInput, setSearchInput] = useState('')
  const [aiSearchInput, setAiSearchInput] = useState('')
  const [debouncedSearch, setDebouncedSearch] = useState('')
  const [debouncedAi, setDebouncedAi] = useState('')
  const [filters, setFilters] = useState(() => ({ ...INITIAL_FILTERS }))
  const [filterOpen, setFilterOpen] = useState(false)
  const [list, setList] = useState([])
  const [loading, setLoading] = useState(false)
  const [loadingMore, setLoadingMore] = useState(false)
  const [hasMore, setHasMore] = useState(false)
  const [multiPicked, setMultiPicked] = useState([])
  const [quickSaving, setQuickSaving] = useState(false)
  const [quickAiError, setQuickAiError] = useState('')
  const [quickCreateDraft, setQuickCreateDraft] = useState(null)
  const [quickCreateExpanded, setQuickCreateExpanded] = useState(false)
  const [planningContextSummary, setPlanningContextSummary] = useState(null)
  const [planningTargetProfileSummary, setPlanningTargetProfileSummary] = useState(null)
  const [planningLlmRankApplied, setPlanningLlmRankApplied] = useState(false)
  const [planningLlmIntentApplied, setPlanningLlmIntentApplied] = useState(false)
  const [planningRetrievalPhase, setPlanningRetrievalPhase] = useState('')
  const [planningQueryIntentSummary, setPlanningQueryIntentSummary] = useState(null)
  const [planningIntentResolved, setPlanningIntentResolved] = useState(null)
  const [planningHasSearched, setPlanningHasSearched] = useState(false)
  const [planningSubmittedQuery, setPlanningSubmittedQuery] = useState('')
  const [planningSearchTick, setPlanningSearchTick] = useState(0)
  const [variantPickByExerciseId, setVariantPickByExerciseId] = useState({})
  const pickerScrollRef = useRef(null)

  const resolvedPlanningUnitId = useMemo(() => {
    const raw = planningUnitId ?? planningContext?.unitId
    const id = Number(raw)
    return Number.isFinite(id) && id > 0 ? id : null
  }, [planningUnitId, planningContext?.unitId])

  const activePlanningContext = useMemo(() => {
    if (pickerMode !== 'planning') return null
    const groupIdRaw = planningContext?.groupId
    const groupId = Number(groupIdRaw)
    const base = {
      groupId: Number.isFinite(groupId) && groupId > 0 ? groupId : null,
      sectionOrderIndex: planningContext?.sectionOrderIndex ?? 0,
      sectionTitle: planningContext?.sectionTitle ?? null,
      sectionGuidanceNotes: planningContext?.sectionGuidanceNotes ?? null,
      sectionPlannedExerciseIds: Array.isArray(planningContext?.sectionPlannedExerciseIds)
        ? planningContext.sectionPlannedExerciseIds
        : [],
      sectionExerciseCount: planningContext?.sectionExerciseCount ?? null,
      lastExerciseTitle: planningContext?.lastExerciseTitle ?? null,
      phaseOrderIndex: planningContext?.phaseOrderIndex ?? null,
      parallelStreamOrderIndex: planningContext?.parallelStreamOrderIndex ?? null,
      anchorExerciseId: planningContext?.anchorExerciseId ?? null,
      anchorExerciseVariantId: planningContext?.anchorExerciseVariantId ?? null,
      progressionGraphId: planningContext?.progressionGraphId ?? null,
      plannedExerciseIds: Array.isArray(planningContext?.plannedExerciseIds)
        ? planningContext.plannedExerciseIds
        : [],
      intentHint: planningContext?.intentHint ?? null,
    }
    if (!resolvedPlanningUnitId) {
      if (!enableFreePlanningSearch && !planningContext) return null
      return { unitId: null, ...base }
    }
    return {
      unitId: resolvedPlanningUnitId,
      ...base,
    }
  }, [pickerMode, resolvedPlanningUnitId, enableFreePlanningSearch, planningContext])

  const usePlanningSearch = pickerMode === 'planning' && activePlanningContext != null
  const useFreePlanningSearch = usePlanningSearch && !resolvedPlanningUnitId
  const planningSearchBlocked = Boolean(
    pickerMode === 'planning' &&
      expectPlanningSearch &&
      !resolvedPlanningUnitId &&
      !enableFreePlanningSearch
  )

  /** Gemeinsamer Suchtext — Planung: nur nach Button; Bibliothek: debounced live. */
  const effectivePickerQuery = useMemo(() => {
    if (usePlanningSearch) {
      return planningSubmittedQuery
    }
    return [debouncedSearch, debouncedAi].filter(Boolean).join(' ').trim()
  }, [usePlanningSearch, planningSubmittedQuery, debouncedSearch, debouncedAi])

  const submitPlanningSearch = useCallback((queryOverride) => {
    const q =
      queryOverride !== undefined && queryOverride !== null
        ? String(queryOverride).trim()
        : (searchInput || aiSearchInput).trim()
    setPlanningSubmittedQuery(q)
    setPlanningHasSearched(true)
    setQuickCreateExpanded(false)
    setList([])
    setPlanningSearchTick((t) => t + 1)
  }, [searchInput, aiSearchInput])

  const {
    title: quickTitle,
    sketch: quickSketch,
    focusAreaId: quickFocusAreaId,
    setTitle: setQuickTitle,
    setSketch: setQuickSketch,
    setFocusAreaId: setQuickFocusAreaId,
    resetQuickCreateFields,
  } = useExerciseAiQuickCreateFields(effectivePickerQuery, { enabled: open && enableQuickCreateDraft })

  const toggleMultiPick = (ex) => {
    setMultiPicked((prev) => {
      if (prev.some((p) => p.id === ex.id)) return prev.filter((p) => p.id !== ex.id)
      const vid = resolveExercisePickVariantId(ex, variantPickByExerciseId[ex.id])
      return [...prev, { ...ex, exercise_variant_id: vid }]
    })
  }

  const buildExercisePickPayload = (ex) => {
    const vid = resolveExercisePickVariantId(ex, variantPickByExerciseId[ex.id])
    return {
      ...ex,
      exercise_variant_id: vid,
      suggested_variant_id: vid ?? ex.suggested_variant_id ?? null,
    }
  }

  const setVariantPickForExercise = (exerciseId, variantId) => {
    const eid = Number(exerciseId)
    if (!Number.isFinite(eid) || eid < 1) return
    setVariantPickByExerciseId((prev) => ({
      ...prev,
      [eid]: variantId === '' || variantId == null ? null : Number(variantId),
    }))
    setMultiPicked((prev) =>
      prev.map((p) =>
        Number(p.id) === eid
          ? {
              ...p,
              exercise_variant_id: resolveExercisePickVariantId(p, variantId === '' ? null : Number(variantId)),
            }
          : p,
      ),
    )
  }

  useEffect(() => {
    if (!usePlanningSearch) setQuickCreateExpanded(false)
  }, [effectivePickerQuery, usePlanningSearch])

  useEffect(() => {
    const t = setTimeout(() => setDebouncedSearch(searchInput.trim()), 350)
    return () => clearTimeout(t)
  }, [searchInput])

  useEffect(() => {
    const t = setTimeout(() => setDebouncedAi(aiSearchInput.trim()), 350)
    return () => clearTimeout(t)
  }, [aiSearchInput])

  const canOfferQuickCreate =
    enableQuickCreateDraft &&
    catalogsReady &&
    !loading &&
    (usePlanningSearch ? planningHasSearched : effectivePickerQuery.length >= 3)

  const showQuickCreateFull = canOfferQuickCreate && (list.length === 0 || quickCreateExpanded)
  const showQuickCreateTeaser = canOfferQuickCreate && list.length > 0 && !quickCreateExpanded

  const quickCreateHeadline = usePlanningSearch
    ? 'Nichts Richtiges dabei?'
    : list.length > 0
      ? 'Neue Übung anlegen'
      : undefined

  const quickCreateHint = usePlanningSearch
    ? effectivePickerQuery
      ? `Aus Planungsanfrage „${effectivePickerQuery}“ oder eigener Idee — KI schlägt Texte vor, danach bearbeiten und übernehmen.`
      : 'Aus Planungskontext oder eigener Idee — KI schlägt Texte vor, danach bearbeiten und übernehmen.'
    : undefined

  const renderQuickCreateOffer = () => (
    <ExerciseAiQuickCreateOffer
      searchLabel={effectivePickerQuery || undefined}
      title={quickTitle}
      onTitleChange={setQuickTitle}
      sketch={quickSketch}
      onSketchChange={setQuickSketch}
      focusAreaId={quickFocusAreaId}
      onFocusAreaChange={setQuickFocusAreaId}
      focusAreas={catalogs.focusAreas}
      catalogsReady={catalogsReady}
      busy={quickSaving}
      error={quickAiError}
      onRunAi={runQuickCreateAiSuggest}
      headline={quickCreateHeadline}
      hint={quickCreateHint}
    />
  )

  const renderPlanningVariantPick = (ex) => {
    if (!usePlanningSearch || !ex?.id) return null
    const variants = Array.isArray(ex.variants) ? ex.variants : []
    const resolved = resolveExercisePickVariantId(ex, variantPickByExerciseId[ex.id])
    if (ex.suggested_variant_name && !variants.length) {
      return (
        <span className="exercise-tag" style={{ marginTop: 6, display: 'inline-block' }}>
          Variante: {ex.suggested_variant_name}
        </span>
      )
    }
    if (variants.length === 0) return null
    return (
      <div
        style={{ marginTop: 8, display: 'flex', flexWrap: 'wrap', gap: '6px', alignItems: 'center' }}
        onClick={(e) => e.stopPropagation()}
        onKeyDown={(e) => e.stopPropagation()}
      >
        <label className="form-label" style={{ margin: 0, fontSize: '11px' }}>
          Variante
        </label>
        <select
          className="form-input"
          style={{ fontSize: '12px', padding: '4px 8px', maxWidth: '100%', flex: '1 1 160px' }}
          value={resolved ?? ''}
          onChange={(e) => {
            const v = e.target.value
            setVariantPickForExercise(ex.id, v === '' ? null : Number(v))
          }}
        >
          <option value="">— Standard —</option>
          {variants.map((v) => (
            <option key={v.id} value={v.id}>
              {v.variant_name || `Variante #${v.id}`}
            </option>
          ))}
        </select>
        {ex.suggested_variant_id && Number(ex.suggested_variant_id) === Number(resolved) ? (
          <span style={{ fontSize: '11px', color: 'var(--accent-dark)' }}>Progressionsgraph</span>
        ) : null}
      </div>
    )
  }

  useEffect(() => {
    if (!open) setVariantPickByExerciseId({})
  }, [open])

  useEffect(() => {
    if (!open) return
    let cancelled = false
    ;(async () => {
      try {
        const [fa, sd, tt, tg, sk] = await Promise.all([
          api.listFocusAreas(),
          api.listStyleDirections(),
          api.listTrainingTypes(),
          api.listTargetGroups(),
          api.listSkillsCatalog(),
        ])
        if (!cancelled) {
          setCatalogs({
            focusAreas: fa,
            styleDirections: sd,
            trainingTypes: tt,
            targetGroups: tg,
            skills: sk,
          })
          setCatalogsReady(true)
        }
      } catch (e) {
        console.error(e)
        if (!cancelled) setCatalogsReady(true)
      }
    })()
    return () => {
      cancelled = true
    }
  }, [open])

  useEffect(() => {
    if (!open) {
      setSearchInput('')
      setAiSearchInput('')
      setDebouncedSearch('')
      setDebouncedAi('')
      setFilters({ ...INITIAL_FILTERS })
      setFilterOpen(false)
      setList([])
      setHasMore(false)
      setMultiPicked([])
      resetQuickCreateFields()
      setQuickSaving(false)
      setQuickAiError('')
      setQuickCreateDraft(null)
      setQuickCreateExpanded(false)
      setPlanningContextSummary(null)
      setPlanningTargetProfileSummary(null)
      setPlanningLlmRankApplied(false)
      setPlanningLlmIntentApplied(false)
      setPlanningRetrievalPhase('')
      setPlanningQueryIntentSummary(null)
      setPlanningIntentResolved(null)
      setPlanningHasSearched(false)
      setPlanningSubmittedQuery('')
      setPlanningSearchTick(0)
      return
    }
    setFilters(mergeExerciseListPrefsFromApi(user?.exercise_list_prefs))
  }, [open, user?.exercise_list_prefs])

  const focusOptions = useMemo(
    () => catalogs.focusAreas.map((fa) => ({ id: fa.id, label: `${fa.icon || ''} ${fa.name || ''}`.trim() })),
    [catalogs.focusAreas]
  )
  const styleOptions = useMemo(
    () => catalogs.styleDirections.map((s) => ({ id: s.id, label: s.name || String(s.id) })),
    [catalogs.styleDirections]
  )
  const trainingTypeOptions = useMemo(
    () => catalogs.trainingTypes.map((t) => ({ id: t.id, label: t.name || String(t.id) })),
    [catalogs.trainingTypes]
  )
  const targetGroupOptions = useMemo(
    () => catalogs.targetGroups.map((g) => ({ id: g.id, label: g.name || String(g.id) })),
    [catalogs.targetGroups]
  )
  const visibilityOptions = useMemo(
    () => [
      { id: 'private', label: 'Privat' },
      { id: 'club', label: 'Verein' },
      { id: 'official', label: 'Offiziell' },
    ],
    []
  )
  const statusOptions = useMemo(
    () => [
      { id: 'draft', label: 'Entwurf' },
      { id: 'in_review', label: 'In Prüfung' },
      { id: 'approved', label: 'Freigegeben' },
      { id: 'archived', label: 'Archiviert' },
    ],
    []
  )

  const queryBase = useMemo(() => {
    const q = {}
    const n = (v) => (v === '' || v == null ? undefined : Number(v))
    const ids = (arr) =>
      Array.isArray(arr) && arr.length ? arr.map((x) => Number(x)).filter((x) => !Number.isNaN(x)) : undefined
    const fMn = splitMnCatalogRules(filters.focus_rules)
    if (fMn.includeIds.length) q.focus_area_must_include_ids = fMn.includeIds
    if (fMn.excludeIds.length) q.focus_area_must_exclude_ids = fMn.excludeIds
    if (filters.focus_only_without) q.focus_only_without_focus_areas = true

    const fa = ids(filters.focus_area_ids)
    if (fa?.length) q.focus_area_ids = fa

    const sdMn = splitMnCatalogRules(filters.style_direction_rules)
    if (sdMn.includeIds.length) q.style_direction_must_include_ids = sdMn.includeIds
    if (sdMn.excludeIds.length) q.style_direction_must_exclude_ids = sdMn.excludeIds
    const sdLegacy = ids(filters.style_direction_ids)
    if (sdLegacy?.length) q.style_direction_ids = sdLegacy

    const ttMn = splitMnCatalogRules(filters.training_type_rules)
    if (ttMn.includeIds.length) q.training_type_must_include_ids = ttMn.includeIds
    if (ttMn.excludeIds.length) q.training_type_must_exclude_ids = ttMn.excludeIds
    const ttLegacy = ids(filters.training_type_ids)
    if (ttLegacy?.length) q.training_type_ids = ttLegacy

    const tgMn = splitMnCatalogRules(filters.target_group_rules)
    if (tgMn.includeIds.length) q.target_group_must_include_ids = tgMn.includeIds
    if (tgMn.excludeIds.length) q.target_group_must_exclude_ids = tgMn.excludeIds
    const tgLegacy = ids(filters.target_group_ids)
    if (tgLegacy?.length) q.target_group_ids = tgLegacy

    const visMn = splitScalarCatalogRules(filters.visibility_rules)
    if (visMn.includeVals.length) q.visibility_any = visMn.includeVals
    if (visMn.excludeVals.length) q.visibility_exclude_any = visMn.excludeVals

    const stMn = splitScalarCatalogRules(filters.status_rules)
    if (stMn.includeVals.length) q.status_any = stMn.includeVals
    if (stMn.excludeVals.length) q.status_exclude_any = stMn.excludeVals

    const sk = ids(filters.skill_ids)
    if (sk?.length) q.skill_ids = sk
    if (filters.skill_min_level) q.skill_min_level = n(filters.skill_min_level)
    if (filters.skill_max_level) q.skill_max_level = n(filters.skill_max_level)
    if (filters.exclude_without_focus) q.exclude_without_focus = true
    if (filters.include_archived) q.include_archived = true
    if (effectivePickerQuery) q.search = effectivePickerQuery
    if (
      Array.isArray(exerciseKindAny) &&
      exerciseKindAny.length > 0
    ) {
      q.exercise_kind_any = exerciseKindAny
    }
    return q
  }, [filters, effectivePickerQuery, exerciseKindAny])

  const reloadLibrary = useCallback(async () => {
    if (!open || !catalogsReady || usePlanningSearch) return
    setLoading(true)
    try {
      setPlanningContextSummary(null)
      setPlanningTargetProfileSummary(null)
      setPlanningLlmRankApplied(false)
      setPlanningLlmIntentApplied(false)
      setPlanningRetrievalPhase('')
      setPlanningQueryIntentSummary(null)
      setPlanningIntentResolved(null)
      const batch = await api.listExercises({
        ...queryBase,
        include_archived: true,
        include_variants: true,
        limit: PAGE_SIZE,
        offset: 0,
      })
      setList(Array.isArray(batch) ? batch : [])
      setHasMore(batch?.length === PAGE_SIZE)
    } catch (e) {
      console.error(e)
      alert(e.message || 'Laden fehlgeschlagen')
      setList([])
      setHasMore(false)
    } finally {
      setLoading(false)
    }
  }, [open, catalogsReady, usePlanningSearch, queryBase])

  const reloadPlanning = useCallback(async () => {
    if (!open || !catalogsReady || !usePlanningSearch || planningSearchTick === 0) return
    if (planningSearchBlocked || !activePlanningContext) {
      setList([])
      setHasMore(false)
      setPlanningContextSummary(null)
      setPlanningTargetProfileSummary(null)
      setPlanningLlmRankApplied(false)
      setPlanningLlmIntentApplied(false)
      setPlanningRetrievalPhase('')
      setPlanningQueryIntentSummary(null)
      setPlanningIntentResolved(null)
      setLoading(false)
      return
    }
    setLoading(true)
    try {
      const query = planningSubmittedQuery
      const requestBody = {
        section_order_index:
          activePlanningContext.sectionOrderIndex != null
            ? Number(activePlanningContext.sectionOrderIndex)
            : null,
        phase_order_index:
          activePlanningContext.phaseOrderIndex != null
            ? Number(activePlanningContext.phaseOrderIndex)
            : null,
        parallel_stream_order_index:
          activePlanningContext.parallelStreamOrderIndex != null
            ? Number(activePlanningContext.parallelStreamOrderIndex)
            : null,
        anchor_exercise_id:
          activePlanningContext.anchorExerciseId != null
            ? Number(activePlanningContext.anchorExerciseId)
            : null,
        anchor_exercise_variant_id:
          activePlanningContext.anchorExerciseVariantId != null
            ? Number(activePlanningContext.anchorExerciseVariantId)
            : undefined,
        progression_graph_id:
          activePlanningContext.progressionGraphId != null
            ? Number(activePlanningContext.progressionGraphId)
            : null,
        planned_exercise_ids:
          Array.isArray(activePlanningContext.plannedExerciseIds) &&
          activePlanningContext.plannedExerciseIds.length > 0
            ? activePlanningContext.plannedExerciseIds
                .map((x) => Number(x))
                .filter((x) => Number.isFinite(x) && x > 0)
            : undefined,
        include_llm_intent:
          query.length >= PLANNING_LLM_INTENT_MIN_CHARS || !(query || '').trim(),
        include_llm_rank: true,
        query,
        intent_hint:
          activePlanningContext.intentHint || (useFreePlanningSearch && query ? 'free_search' : null),
        limit: PLANNING_SUGGEST_LIMIT,
        exercise_kind_any:
          Array.isArray(exerciseKindAny) && exerciseKindAny.length > 0 ? exerciseKindAny : undefined,
      }
      if (resolvedPlanningUnitId) {
        requestBody.unit_id = Number(resolvedPlanningUnitId)
      }
        if (activePlanningContext.groupId) {
          requestBody.group_id = Number(activePlanningContext.groupId)
        }
        if (activePlanningContext.sectionTitle) {
          requestBody.section_title = String(activePlanningContext.sectionTitle)
        }
        if (activePlanningContext.sectionGuidanceNotes) {
          requestBody.section_guidance_notes = String(activePlanningContext.sectionGuidanceNotes)
        }
        if (
          Array.isArray(activePlanningContext.sectionPlannedExerciseIds) &&
          activePlanningContext.sectionPlannedExerciseIds.length > 0
        ) {
          requestBody.section_planned_exercise_ids = activePlanningContext.sectionPlannedExerciseIds
            .map((x) => Number(x))
            .filter((x) => Number.isFinite(x) && x > 0)
        }
        const res = await api.suggestPlanningExercises(requestBody)
      setPlanningContextSummary(res?.context_summary || null)
      setPlanningTargetProfileSummary(res?.target_profile_summary || null)
      setPlanningLlmRankApplied(Boolean(res?.llm_rank_applied))
      setPlanningLlmIntentApplied(Boolean(res?.profile_llm_applied ?? res?.llm_intent_applied))
      setPlanningRetrievalPhase(res?.retrieval_phase || '')
      setPlanningQueryIntentSummary(res?.query_intent_summary || null)
      setPlanningIntentResolved(res?.intent_resolved || null)
      const hits = (Array.isArray(res?.hits) ? res.hits : []).map((h) => ({
        id: h.id,
        title: h.title,
        summary: h.summary,
        focus_area: h.focus_area,
        variants: Array.isArray(h.variants) ? h.variants : [],
        suggested_variant_id: h.suggested_variant_id ?? null,
        suggested_variant_name: h.suggested_variant_name ?? null,
        _planningScore: h.score,
        _planningReasons: Array.isArray(h.reasons) ? h.reasons : [],
        updated_at: new Date().toISOString(),
      }))
      const initialVariants = {}
      for (const h of hits) {
        if (h.suggested_variant_id) initialVariants[h.id] = Number(h.suggested_variant_id)
      }
      setVariantPickByExerciseId(initialVariants)
      setList(hits)
      setHasMore(false)
    } catch (e) {
      console.error(e)
      alert(e.message || 'Laden fehlgeschlagen')
      setList([])
      setHasMore(false)
      setPlanningContextSummary(null)
      setPlanningTargetProfileSummary(null)
      setPlanningLlmRankApplied(false)
      setPlanningLlmIntentApplied(false)
      setPlanningRetrievalPhase('')
      setPlanningQueryIntentSummary(null)
      setPlanningIntentResolved(null)
    } finally {
      setLoading(false)
    }
  }, [
    open,
    catalogsReady,
    usePlanningSearch,
    planningSearchTick,
    planningSearchBlocked,
    activePlanningContext,
    planningSubmittedQuery,
    exerciseKindAny,
    resolvedPlanningUnitId,
    useFreePlanningSearch,
  ])

  useEffect(() => {
    reloadLibrary()
  }, [reloadLibrary])

  useEffect(() => {
    reloadPlanning()
  }, [reloadPlanning])

  const loadMore = async () => {
    if (!hasMore || loadingMore || loading) return
    const last = list[list.length - 1]
    if (!last?.id || last.updated_at == null) return
    setLoadingMore(true)
    try {
      const batch = await api.listExercises({
        ...queryBase,
        include_archived: true,
        include_variants: true,
        limit: PAGE_SIZE,
        cursor_updated_at:
          typeof last.updated_at === 'string'
            ? last.updated_at
            : new Date(last.updated_at).toISOString(),
        cursor_id: last.id,
      })
      setList((prev) => [...prev, ...(Array.isArray(batch) ? batch : [])])
      setHasMore(batch?.length === PAGE_SIZE)
    } catch (e) {
      console.error(e)
      alert(e.message || 'Mehr laden fehlgeschlagen')
    } finally {
      setLoadingMore(false)
    }
  }

  const rowVirtualizer = useVirtualizer({
    count: list.length,
    getScrollElement: () => pickerScrollRef.current,
    estimateSize: (index) => {
      const ex = list[index]
      const rc = ex?._planningReasons?.length || 0
      const hasVariant = usePlanningSearch && Array.isArray(ex?.variants) && ex.variants.length > 0
      return rc > 0 || hasVariant ? 96 + Math.min(rc, 3) * 14 + (hasVariant ? 36 : 0) : 88
    },
    overscan: 8,
    getItemKey: (index) => String(list[index]?.id ?? index),
  })

  const resetFilters = () => setFilters({ ...INITIAL_FILTERS })

  const adoptExistingExercise = async (ex) => {
    if (!ex?.id) return
    const payload = buildExercisePickPayload(ex)
    if (multiSelect && typeof onSelectExercises === 'function') {
      await Promise.resolve(onSelectExercises([payload]))
    } else if (typeof onSelectExercise === 'function') {
      await Promise.resolve(onSelectExercise(payload))
    }
    onClose()
  }

  const runQuickCreateAiSuggest = async () => {
    const title = (quickTitle || '').trim()
    if (title.length < 3) {
      alert('Titel: mindestens 3 Zeichen.')
      return
    }
    const sketch = (quickSketch || '').trim()

    const focusId = parseInt(String(quickFocusAreaId).trim(), 10)
    if (!Number.isFinite(focusId) || focusId < 1) {
      alert('Bitte einen Fokusbereich wählen.')
      return
    }

    const focusRow = (catalogs.focusAreas || []).find((x) => Number(x.id) === focusId)
    const focusHint = (focusRow?.name || '').trim()

    setQuickAiError('')
    setQuickCreateDraft(null)
    const planningContextPayload = buildPickerPlanningContextForAi({
      planningContextSummary,
      planningContext,
      searchQuery: planningSubmittedQuery || searchInput || aiSearchInput,
    })

    setQuickSaving(true)
    try {
      const aiRes = await api.suggestExerciseAi({
        title,
        goal: sketch || undefined,
        execution: '',
        preparation: '',
        trainer_notes: '',
        focus_area_hint: focusHint || undefined,
        focus_areas_context: [{ focus_area_id: focusId, is_primary: true }],
        planning_context: planningContextPayload || undefined,
        include_summary: true,
        include_skills: true,
        include_instructions: true,
      })

      const preview = buildQuickCreateAiPreview(aiRes, { sketchPlain: sketch })
      if (!preview.hasSummaryProposal && !preview.hasInstructionChoices && !preview.hasSkillChoices) {
        throw new Error('Die KI lieferte keinen verwertbaren Vorschlag.')
      }
      setQuickCreateDraft(
        aiPreviewToQuickCreateDraft(preview, { title, focusAreaId: focusId, sketchPlain: sketch }),
      )
    } catch (e) {
      console.error(e)
      const msg = e?.message || String(e)
      setQuickAiError(msg)
      alert(msg || 'KI-Vorschlag fehlgeschlagen')
    } finally {
      setQuickSaving(false)
    }
  }

  const applyQuickCreateDraft = async () => {
    if (!quickCreateDraft) return

    setQuickSaving(true)
    setQuickAiError('')
    try {
      const payload = buildQuickCreateExercisePayloadFromDraft(quickCreateDraft)
      const created = await api.createExercise(payload)
      if (!created?.id) throw new Error('Anlegen fehlgeschlagen')
      setQuickCreateDraft(null)
      await adoptExistingExercise(created)
    } catch (e) {
      console.error(e)
      const msg = e?.message || String(e)
      setQuickAiError(msg)
      alert(msg || 'Übung konnte nicht angelegt werden')
    } finally {
      setQuickSaving(false)
    }
  }

  if (!open) return null

  return (
    <div
      className="admin-modal-backdrop"
      role="presentation"
      onClick={(e) => {
        if (e.target === e.currentTarget) onClose()
      }}
    >
      <div
        className="admin-modal-sheet"
        role="dialog"
        aria-modal="true"
        style={{ maxWidth: '920px', width: '100%', maxHeight: '92vh', display: 'flex', flexDirection: 'column' }}
        onClick={(e) => e.stopPropagation()}
      >
        <div className="admin-modal-sheet__header">
          <h3 className="admin-modal-sheet__title">
            {usePlanningSearch
              ? multiSelect
                ? 'Planungs-KI: Übungen vorschlagen'
                : 'Planungs-KI: Übung vorschlagen'
              : multiSelect
                ? 'Übungen auswählen'
                : 'Übung auswählen'}
          </h3>
          <button type="button" className="btn btn-secondary admin-modal-sheet__close" onClick={onClose}>
            Schließen
          </button>
        </div>

        <div style={{ padding: '0 1rem 0.75rem', borderBottom: '1px solid var(--border)', flexShrink: 0 }}>
          {usePlanningSearch && planningContextSummary ? (
            <div
              style={{
                marginBottom: '10px',
                padding: '8px 10px',
                borderRadius: '8px',
                background: 'var(--surface2)',
                border: '1px solid var(--border)',
                fontSize: '12px',
                color: 'var(--text2)',
                lineHeight: 1.45,
              }}
            >
              <strong style={{ color: 'var(--text1)', fontSize: '13px' }}>Planungskontext</strong>
              <div style={{ marginTop: '4px', display: 'flex', flexWrap: 'wrap', gap: '6px' }}>
                {planningContextSummary.group_name ? (
                  <span className="exercise-tag">{planningContextSummary.group_name}</span>
                ) : null}
                {planningContextSummary.unit_title ? (
                  <span className="exercise-tag">{planningContextSummary.unit_title}</span>
                ) : null}
                {planningContextSummary.section_title ? (
                  <span className="exercise-tag">{planningContextSummary.section_title}</span>
                ) : null}
                {planningContextSummary.section_exercise_count != null ? (
                  <span className="exercise-tag">
                    {planningContextSummary.section_exercise_count} Übungen im Abschnitt
                  </span>
                ) : null}
                {planningContextSummary.last_section_exercise_title ? (
                  <span className="exercise-tag">
                    Letzte: {planningContextSummary.last_section_exercise_title}
                  </span>
                ) : null}
                {planningContextSummary.planned_count != null ? (
                  <span className="exercise-tag">{planningContextSummary.planned_count} Übungen im Plan</span>
                ) : null}
                {planningContextSummary.anchor_title ? (
                  <span className="exercise-tag exercise-tag--accent">
                    Anker: {planningContextSummary.anchor_title}
                  </span>
                ) : null}
                {planningContextSummary.progression_graph_name ? (
                  <span className="exercise-tag">
                    Graph: {planningContextSummary.progression_graph_name}
                    {planningContextSummary.progression_graph_auto_resolved ? ' (auto)' : ''}
                  </span>
                ) : null}
                {Array.isArray(planningTargetProfileSummary?.focus_areas) &&
                planningTargetProfileSummary.focus_areas.length > 0
                  ? planningTargetProfileSummary.focus_areas.map((fa) => (
                      <span key={fa} className="exercise-tag">
                        Fokus: {fa}
                      </span>
                    ))
                  : null}
                {Array.isArray(planningTargetProfileSummary?.top_skills) &&
                planningTargetProfileSummary.top_skills.length > 0
                  ? planningTargetProfileSummary.top_skills.slice(0, 3).map((sk) => (
                      <span key={sk.skill_id} className="exercise-tag">
                        {sk.name}
                      </span>
                    ))
                  : null}
              </div>
              {planningContextSummary.section_guidance_notes ? (
                <p style={{ margin: '6px 0 0', fontSize: '11px', color: 'var(--text2)' }}>
                  Abschnitt: {planningContextSummary.section_guidance_notes}
                </p>
              ) : null}
              {planningContextSummary.expectation_mode ? (
                <p style={{ margin: '4px 0 0', fontSize: '11px', color: 'var(--text3)' }}>
                  Erwartungsprofil:{' '}
                  {planningContextSummary.expectation_mode === 'query_only'
                    ? 'nur Suchtext'
                    : 'Planung + optional Suchtext'}
                </p>
              ) : null}
              {planningTargetProfileSummary?.has_skill_gap ? (
                <p style={{ margin: '6px 0 0', fontSize: '11px', color: 'var(--text3)' }}>
                  Skill-Lücke zum bisherigen Plan berücksichtigt
                </p>
              ) : null}
              {planningQueryIntentSummary?.rationale ? (
                <p style={{ margin: '6px 0 0', fontSize: '11px', color: 'var(--text2)' }}>
                  {planningQueryIntentSummary.rationale}
                </p>
              ) : null}
              {planningIntentResolved ? (
                <p style={{ margin: '6px 0 0', fontSize: '11px', color: 'var(--text3)' }}>
                  Modus: {planningIntentResolved.replace(/_/g, ' ')}
                  {planningQueryIntentSummary?.scenario
                    ? ` · ${String(planningQueryIntentSummary.scenario).replace(/_/g, ' ')}`
                    : null}
                  {planningLlmRankApplied ? ' · KI-Ranking aktiv' : null}
                  {planningLlmIntentApplied
                    ? planningQueryIntentSummary?.llm_expectation_applied
                      ? ' · KI-Erwartungsprofil aktiv'
                      : ' · KI-Intent aktiv'
                    : null}
                  {!planningLlmRankApplied && !planningLlmIntentApplied && usePlanningSearch
                    ? ' · ohne LLM (Profil/Hybrid)'
                    : null}
                  {planningRetrievalPhase ? ` · ${planningRetrievalPhase}` : null}
                </p>
              ) : null}
            </div>
          ) : null}
          {planningSearchBlocked ? (
            <p
              style={{
                margin: '0 0 10px',
                padding: '10px 12px',
                borderRadius: '8px',
                background: 'color-mix(in srgb, var(--danger) 12%, var(--surface2))',
                border: '1px solid color-mix(in srgb, var(--danger) 35%, var(--border))',
                fontSize: '13px',
                color: 'var(--text1)',
                lineHeight: 1.45,
              }}
            >
              <strong>Planungs-KI noch nicht verfügbar.</strong> Bitte zuerst <strong>Speichern</strong> oder den
              Menüpunkt <strong>Planungs-KI: Übung vorschlagen</strong> nutzen (Freitext ohne gespeicherte Einheit).
            </p>
          ) : null}
          {pickerMode === 'library' && expectPlanningSearch ? (
            <p
              style={{
                margin: '0 0 10px',
                padding: '8px 10px',
                borderRadius: '8px',
                background: 'var(--surface2)',
                border: '1px solid var(--border)',
                fontSize: '12px',
                color: 'var(--text2)',
              }}
            >
              <strong style={{ color: 'var(--text1)' }}>Bibliothekssuche (Volltext)</strong> — für Planungs-KI mit
              Kontext oder Freitext-Anfrage den Menüpunkt{' '}
              <strong>Planungs-KI: Übung vorschlagen …</strong> unter dem <strong>+</strong> wählen.
            </p>
          ) : null}
          {useFreePlanningSearch ? (
            <p
              style={{
                margin: '0 0 10px',
                padding: '8px 10px',
                borderRadius: '8px',
                background: 'var(--surface2)',
                border: '1px solid var(--border)',
                fontSize: '12px',
                color: 'var(--text2)',
              }}
            >
              <strong style={{ color: 'var(--text1)' }}>Freie Planungs-KI</strong> — Anker und bisherige Übungen aus
              dem Formular; nach Speichern kommen Gruppe, Historie und Rahmen dazu.
            </p>
          ) : null}
          {!usePlanningSearch && !planningSearchBlocked && !expectPlanningSearch ? (
            <p
              style={{
                margin: '0 0 10px',
                padding: '8px 10px',
                borderRadius: '8px',
                background: 'var(--surface2)',
                border: '1px solid var(--border)',
                fontSize: '12px',
                color: 'var(--text2)',
              }}
            >
              <strong style={{ color: 'var(--text1)' }}>Bibliothekssuche (Volltext)</strong>
            </p>
          ) : null}
          <div style={{ display: 'grid', gap: '0.65rem' }}>
            {usePlanningSearch ? (
              <div>
                <label className="form-label">Planungs-Anfrage (KI)</label>
                <div style={{ display: 'flex', flexWrap: 'wrap', gap: '0.5rem', alignItems: 'stretch' }}>
                  <input
                    type="text"
                    className="form-input"
                    style={{ flex: '1 1 220px', minWidth: 0 }}
                    placeholder="z. B. Vertiefung Reaktion mit Partner, baut auf dem Plan auf …"
                    value={searchInput || aiSearchInput}
                    onChange={(e) => {
                      const v = e.target.value
                      setSearchInput(v)
                      setAiSearchInput(v)
                    }}
                    onKeyDown={(e) => {
                      if (e.key === 'Enter') {
                        e.preventDefault()
                        submitPlanningSearch()
                      }
                    }}
                    autoComplete="off"
                  />
                  <button
                    type="button"
                    className="btn btn-primary"
                    disabled={loading || planningSearchBlocked}
                    onClick={() => submitPlanningSearch()}
                  >
                    {loading ? 'Suche …' : 'Vorschläge laden'}
                  </button>
                  <button
                    type="button"
                    className="btn btn-secondary"
                    disabled={loading || planningSearchBlocked}
                    title="Leere Anfrage — nur Planungskontext (Anker, Plan, Profil), ohne LLM"
                    onClick={() => {
                      setSearchInput('')
                      setAiSearchInput('')
                      submitPlanningSearch('')
                    }}
                  >
                    Nächste aus Kontext
                  </button>
                </div>
                <p style={{ margin: '4px 0 0', fontSize: '11px', color: 'var(--text3)' }}>
                  Suche startet erst per Button (oder Enter) — nicht beim Tippen. LLM nur bei längeren Anfragen,
                  maximal ein KI-Call pro Suche.
                </p>
              </div>
            ) : (
              <>
                <div>
                  <label className="form-label">Volltextsuche</label>
                  <input
                    type="search"
                    className="form-input"
                    placeholder="Stichwort, Titelfragment…"
                    value={searchInput}
                    onChange={(e) => setSearchInput(e.target.value)}
                    autoComplete="off"
                  />
                </div>
                <div>
                  <label className="form-label">
                    Ergänzung /{' '}
                    <span title="Wird mit Volltextsuche kombiniert">zweites Suchfeld</span>
                  </label>
                  <input
                    type="search"
                    className="form-input"
                    placeholder="zweites Suchkonzept oder Umschreibung…"
                    value={aiSearchInput}
                    onChange={(e) => setAiSearchInput(e.target.value)}
                    autoComplete="off"
                  />
                </div>
              </>
            )}
            <div style={{ display: 'flex', flexWrap: 'wrap', gap: '0.5rem', alignItems: 'center' }}>
              <button type="button" className="btn btn-secondary" onClick={() => setFilterOpen(!filterOpen)}>
                {filterOpen ? 'Filter ausblenden' : 'Erweiterte Filter'}
              </button>
              <button type="button" className="btn" onClick={resetFilters}>
                Filter zurücksetzen
              </button>
              {loading && <span style={{ fontSize: '13px', color: 'var(--text2)' }}>Suche läuft…</span>}
            </div>

            {filterOpen && (
              <div style={{ marginTop: '0.35rem', fontSize: '13px', color: 'var(--text2)' }}>
                  <p style={{ margin: '0 0 12px 0' }}>
                  Felder gelten mit <strong>UND</strong>. Kataloge: mehrere „+“ = alle zutreffend; „−“ schließt aus.
                  Freigabelevel/Status: mehrere „+“ = eine davon (ODER); „−“ blendet aus.
                </p>
                <ExerciseFocusRulePicker
                  focusOptions={focusOptions}
                  focusRules={filters.focus_rules}
                  focusOnlyWithout={filters.focus_only_without}
                  legacyFocusAreaIds={filters.focus_area_ids}
                  onPatch={(patch) => setFilters((f) => ({ ...f, ...patch }))}
                />
                <div className="exercise-filters-modal-grid exercise-filters-modal-grid--catalog" style={{ marginTop: 12 }}>
                  <CatalogRulePicker
                    label="Stilrichtung"
                    hint="+ alle nötig (UND). − verbietet Zuordnung."
                    options={styleOptions}
                    rules={filters.style_direction_rules}
                    rulesFieldName="style_direction_rules"
                    placeholder="Stil …"
                    onPatch={(patch) => setFilters((f) => ({ ...f, ...patch }))}
                  />
                  <CatalogRulePicker
                    label="Trainingsstil"
                    hint="+ alle nötig (UND). − verbietet Zuordnung."
                    options={trainingTypeOptions}
                    rules={filters.training_type_rules}
                    rulesFieldName="training_type_rules"
                    placeholder="Trainingsstil …"
                    onPatch={(patch) => setFilters((f) => ({ ...f, ...patch }))}
                  />
                  <CatalogRulePicker
                    label="Zielgruppe"
                    hint="+ alle nötig (UND). − verbietet Zuordnung."
                    options={targetGroupOptions}
                    rules={filters.target_group_rules}
                    rulesFieldName="target_group_rules"
                    placeholder="Gruppe …"
                    onPatch={(patch) => setFilters((f) => ({ ...f, ...patch }))}
                  />
                </div>
                <div style={{ marginTop: 12 }}>
                  <label className="form-label">Fähigkeit</label>
                  <SkillTreeMultiSelect
                    value={filters.skill_ids}
                    onChange={(v) => setFilters((f) => ({ ...f, skill_ids: v }))}
                    skills={catalogs.skills}
                    placeholder="Fähigkeit …"
                  />
                  <div className="exercise-filter-skill-levels-row" style={{ marginTop: 8 }}>
                    <select
                      className="form-input exercise-filter-level-select"
                      title="von"
                      value={filters.skill_min_level}
                      onChange={(e) => setFilters((f) => ({ ...f, skill_min_level: e.target.value }))}
                    >
                      <option value="">Stufe von</option>
                      {LEVEL_FILTER_OPTS.map((o) => (
                        <option key={o.value} value={String(o.level)}>
                          {o.level}
                        </option>
                      ))}
                    </select>
                    <select
                      className="form-input exercise-filter-level-select"
                      title="bis"
                      value={filters.skill_max_level}
                      onChange={(e) => setFilters((f) => ({ ...f, skill_max_level: e.target.value }))}
                    >
                      <option value="">Stufe bis</option>
                      {LEVEL_FILTER_OPTS.map((o) => (
                        <option key={`m-${o.value}`} value={String(o.level)}>
                          {o.level}
                        </option>
                      ))}
                    </select>
                  </div>
                </div>
                <div className="exercise-filters-modal-grid exercise-filters-modal-grid--two exercise-filters-modal-grid--catalog" style={{ marginTop: 12 }}>
                  <CatalogRulePicker
                    label={EXERCISE_VISIBILITY_FIELD_LABEL}
                    options={visibilityOptions}
                    rules={filters.visibility_rules}
                    rulesFieldName="visibility_rules"
                    idKind="string"
                    placeholder="Freigabelevel …"
                    onPatch={(patch) => setFilters((f) => ({ ...f, ...patch }))}
                  />
                  <CatalogRulePicker
                    label="Status"
                    options={statusOptions}
                    rules={filters.status_rules}
                    rulesFieldName="status_rules"
                    idKind="string"
                    placeholder="Status …"
                    onPatch={(patch) => setFilters((f) => ({ ...f, ...patch }))}
                  />
                </div>
                <div style={{ marginTop: 12, display: 'flex', flexDirection: 'column', gap: 10 }}>
                  <label
                    style={{
                      display: 'flex',
                      alignItems: 'center',
                      gap: 8,
                      cursor: filters.focus_only_without ? 'not-allowed' : 'pointer',
                      opacity: filters.focus_only_without ? 0.55 : 1,
                    }}
                  >
                    <input
                      type="checkbox"
                      disabled={!!filters.focus_only_without}
                      checked={!!filters.exclude_without_focus}
                      onChange={(e) =>
                        setFilters((f) => ({
                          ...f,
                          exclude_without_focus: e.target.checked,
                          ...(e.target.checked ? { focus_only_without: false } : {}),
                        }))
                      }
                    />
                    <span>Ohne Fokus ausblenden</span>
                  </label>
                  <p style={{ margin: 0, fontSize: '12px', color: 'var(--text2)' }}>
                    Hinweis: Für die Planung werden archivierte Übungen bei der Suche immer mit eingeschlossen (bestehende
                    Zuordnungen).
                  </p>
                </div>
              </div>
            )}
          </div>
        </div>

        <div
          ref={pickerScrollRef}
          data-testid="exercise-picker-scroll"
          style={{ flex: 1, minHeight: 0, overflowY: 'auto', padding: '12px 1rem' }}
        >
          {!catalogsReady || (loading && list.length === 0) ? (
            <div style={{ textAlign: 'center', padding: '2rem' }}>
              <div className="spinner" />
            </div>
          ) : list.length === 0 ? (
            showQuickCreateFull ? (
              renderQuickCreateOffer()
            ) : (
              <p style={{ color: 'var(--text2)', textAlign: 'center', lineHeight: 1.5 }}>
                {usePlanningSearch
                  ? !planningHasSearched
                    ? 'Anfrage formulieren und „Vorschläge laden“ klicken — oder „Nächste aus Kontext“ ohne Freitext.'
                    : effectivePickerQuery
                      ? 'Keine KI-Vorschläge für diese Anfrage.'
                      : 'Keine Vorschläge aus dem Planungskontext — Anker, Plan oder Profil prüfen.'
                  : effectivePickerQuery.length >= 3
                    ? 'Keine Treffer.'
                    : 'Suchbegriff eingeben (mind. 3 Zeichen) …'}
              </p>
            )
          ) : (
            <>
              <p style={{ fontSize: '13px', color: 'var(--text2)', marginBottom: 10 }}>
                {usePlanningSearch ? `${list.length} KI-Vorschläge` : `${list.length} angezeigt`}
                {hasMore ? ' · weiter unten „Mehr laden“' : ''}
              </p>
              <div
                role="list"
                aria-label="Übungstreffer"
                style={{
                  position: 'relative',
                  width: '100%',
                  height: rowVirtualizer.getTotalSize(),
                }}
              >
                {rowVirtualizer.getVirtualItems().map((vi) => {
                  const ex = list[vi.index]
                  if (!ex) return null
                  const picked = multiPicked.some((p) => p.id === ex.id)
                  const rowInner = (
                    <>
                      <strong style={{ display: 'block' }}>{ex.title}</strong>
                      {(ex.summary || '').trim().length > 0 && (
                        <span style={{ fontSize: '12px', color: 'var(--text2)' }}>
                          {(ex.summary || '').length > 120
                            ? `${(ex.summary || '').slice(0, 120)}…`
                            : ex.summary}
                        </span>
                      )}
                      {ex.focus_area && (
                        <span className="exercise-tag exercise-tag--accent" style={{ marginTop: 6 }}>
                          {ex.focus_area}
                        </span>
                      )}
                      {(ex.exercise_kind || '').toLowerCase().trim() === 'combination' ? (
                        <span
                          className="exercise-tag"
                          style={{
                            marginTop: 6,
                            marginLeft: 6,
                            background: 'var(--accent-soft)',
                            color: 'var(--accent-dark)',
                          }}
                        >
                          Kombination
                        </span>
                      ) : null}
                      {Array.isArray(ex._planningReasons) && ex._planningReasons.length > 0 ? (
                        <ul
                          style={{
                            margin: '6px 0 0',
                            paddingLeft: '16px',
                            fontSize: '11px',
                            color: 'var(--accent-dark)',
                          }}
                        >
                          {ex._planningReasons.slice(0, 3).map((r) => (
                            <li key={r}>{r}</li>
                          ))}
                        </ul>
                      ) : null}
                      {renderPlanningVariantPick(ex)}
                    </>
                  )
                  return (
                    <div
                      key={vi.key}
                      role="listitem"
                      data-index={vi.index}
                      ref={rowVirtualizer.measureElement}
                      style={{
                        position: 'absolute',
                        top: 0,
                        left: 0,
                        width: '100%',
                        transform: `translateY(${vi.start}px)`,
                        paddingBottom: 8,
                      }}
                    >
                      {multiSelect ? (
                        <label
                          className="tu-ex-picker-multi-row"
                          style={{
                            display: 'flex',
                            gap: '10px',
                            alignItems: 'flex-start',
                            width: '100%',
                            textAlign: 'left',
                            padding: '10px 12px',
                            borderRadius: '8px',
                            border: picked ? '2px solid var(--accent)' : '1px solid var(--border)',
                            background: 'var(--surface2)',
                            cursor: 'pointer',
                            boxSizing: 'border-box',
                          }}
                        >
                          <input
                            type="checkbox"
                            checked={picked}
                            onChange={() => toggleMultiPick(ex)}
                            style={{ marginTop: '0.35rem', flexShrink: 0 }}
                            aria-label={ex.title ? `Auswahl: ${ex.title}` : 'Auswahl'}
                          />
                          <div style={{ flex: 1, minWidth: 0 }}>{rowInner}</div>
                        </label>
                      ) : (
                        <button
                          type="button"
                          onClick={() => adoptExistingExercise(ex)}
                          style={{
                            width: '100%',
                            textAlign: 'left',
                            padding: '10px 12px',
                            borderRadius: '8px',
                            border: '1px solid var(--border)',
                            background: 'var(--surface2)',
                            cursor: 'pointer',
                          }}
                        >
                          {rowInner}
                        </button>
                      )}
                    </div>
                  )
                })}
              </div>
              {hasMore && (
                <div style={{ textAlign: 'center', marginTop: 12 }}>
                  <button type="button" className="btn btn-secondary" disabled={loadingMore} onClick={loadMore}>
                    {loadingMore ? 'Laden…' : 'Mehr laden'}
                  </button>
                </div>
              )}
              {showQuickCreateTeaser ? (
                <ExerciseAiQuickCreateTeaser
                  disabled={quickSaving}
                  onExpand={() => setQuickCreateExpanded(true)}
                />
              ) : null}
              {showQuickCreateFull && quickCreateExpanded ? (
                <div style={{ marginTop: 4 }}>{renderQuickCreateOffer()}</div>
              ) : null}
              {multiSelect && typeof onSelectExercises === 'function' ? (
                <div
                  className="exercise-picker-multi-footer"
                  style={{
                    position: 'sticky',
                    bottom: 0,
                    marginTop: 16,
                    paddingTop: 12,
                    borderTop: '1px solid var(--border)',
                    background: 'var(--surface)',
                    display: 'flex',
                    flexWrap: 'wrap',
                    gap: '10px',
                    alignItems: 'center',
                    justifyContent: 'space-between',
                  }}
                >
                  <span style={{ fontSize: '0.92rem', color: 'var(--text2)' }}>
                    {multiPicked.length} ausgewählt
                  </span>
                  <div style={{ display: 'flex', flexWrap: 'wrap', gap: '8px' }}>
                    <button
                      type="button"
                      className="btn btn-secondary"
                      onClick={() => setMultiPicked([])}
                      disabled={!multiPicked.length}
                    >
                      Auswahl leeren
                    </button>
                    <button
                      type="button"
                      className="btn btn-primary"
                      disabled={!multiPicked.length}
                      onClick={() => {
                        onSelectExercises(multiPicked.map((p) => buildExercisePickPayload(p)))
                        onClose()
                      }}
                    >
                      Übernehmen
                    </button>
                  </div>
                </div>
              ) : null}
            </>
          )}
        </div>
      </div>

      <ExerciseAiSuggestPreviewModal
        draft={quickCreateDraft}
        onDraftChange={setQuickCreateDraft}
        onDiscard={() => setQuickCreateDraft(null)}
        onApply={applyQuickCreateDraft}
        focusAreas={catalogs.focusAreas}
        skillsCatalog={catalogs.skills}
        dialogTitle="Neue Übung — KI-Entwurf bearbeiten"
        hint="Texte sind formatiert — passe Titel, Kurzfassung, Anleitung und Fähigkeiten an, dann speichern und übernehmen."
        applyLabel={quickSaving ? 'Wird angelegt…' : 'Anlegen und übernehmen'}
        applyDisabled={quickSaving}
        zIndex={2100}
      />
    </div>
  )
}