/**
 * Integrierter Slot-Editor für Progressionsgraphen (Phase B).
 */
import React, { useCallback, useEffect, useMemo, useState } from 'react'
import { Link } from 'react-router-dom'
import api from '../utils/api'
import { useAuth } from '../context/AuthContext'
import { getDefaultClubIdForGovernanceForms } from '../utils/activeClub'
import ExercisePickerModal from './ExercisePickerModal'
import ExerciseGapFillPrepModal from './exercises/ExerciseGapFillPrepModal'
import ProgressionSlotCard from './ProgressionSlotCard'
import ProgressionFindingsPanel from './ProgressionFindingsPanel'
import PlanningCatalogContextFields from './PlanningCatalogContextFields'
import {
  aiPreviewToQuickCreateDraft,
  buildQuickCreateAiPreview,
  buildQuickCreateExercisePayloadFromDraft,
  ensureQuickCreateDraftFromAiSuggestion,
} from '../utils/exerciseAiQuickCreate'
import {
  buildPathGapPlanningContextForAi,
  buildSlotGapGoalForAi,
  gapOfferContextDisplayLines,
  initialStageLearningGoalFromOffer,
} from '../utils/planningContextForExerciseAi'
import ExerciseAiSuggestPreviewModal from './ExerciseAiSuggestPreviewModal'
import ProgressionOptimizeCompareModal from './ProgressionOptimizeCompareModal'
import {
  addSlotToDraft,
  applyEvaluateResponseToDraft,
  applyGapOfferToDraft,
  applySelectedCompareSteps,
  applySelectedSlotSuggestions,
  applyResolvedStructuredToDraft,
  buildPlanningArtifactFromDraft,
  buildProgressionComparePayload,
  collectGapOffersFromApiResponse,
  compareSlotDiffs,
  compareDiffsForDialog,
  dedupeGapOffersBySlot,
  draftHasLibrarySlotAssignments,
  EMPTY_PLANNING_CATALOG_CONTEXT,
  filterGapOffersForUnfilledSlots,
  hydrateProgressionGraphDraft,
  insertSlotInDraft,
  librarySlotExercise,
  majorStepsToOverridePayload,
  mergeGapOffersForDraft,
  moveSlotInDraft,
  patchSlotInDraft,
  pathQaQualityPercent,
  planningCatalogContextToApi,
  rejectedCompareDiffs,
  removeSlotFromDraft,
  saveProgressionGraphDraft,
  setCatalogSelectItems,
  setSlotPrimaryLibrary,
  SLOT_MAX,
  SLOT_MIN,
  slotsAsPathStepRows,
  slotsToEvaluateSteps,
  slotsToSlotAssignments,
  syncProgressionRoadmapFromSlots,
  syncSlotPhasesFromRoadmap,
} from '../utils/progressionGraphDraft'

function roadmapStructuredPayload(startSituation, targetState, roadmapNotes) {
  const body = {}
  const start = (startSituation || '').trim()
  const target = (targetState || '').trim()
  const notes = (roadmapNotes || '').trim()
  if (start) body.start_situation = start
  if (target) body.target_state = target
  if (notes) body.roadmap_notes = notes
  return body
}

function resolveDefaultFocusAreaId(targetSummary, focusAreas) {
  const targetName = targetSummary?.focus_areas?.[0]
  if (targetName && Array.isArray(focusAreas) && focusAreas.length) {
    const norm = String(targetName).trim().toLowerCase()
    const hit = focusAreas.find((fa) => String(fa.name || '').trim().toLowerCase() === norm)
    if (hit?.id) return Number(hit.id)
  }
  return focusAreas?.[0]?.id ? Number(focusAreas[0].id) : null
}

export default function ProgressionGraphEditor({ graphId, embedded = false, onSaved }) {
  const { user } = useAuth()
  const [graphMeta, setGraphMeta] = useState(null)
  const [draft, setDraft] = useState(null)
  const [busy, setBusy] = useState(false)
  const [loadErr, setLoadErr] = useState('')
  const [actionErr, setActionErr] = useState('')
  const [matchNotice, setMatchNotice] = useState('')
  const [pickContext, setPickContext] = useState(null)
  const [pathQa, setPathQa] = useState(null)
  const [gapFillOffers, setGapFillOffers] = useState([])
  const [evaluating, setEvaluating] = useState(false)
  const [matching, setMatching] = useState(false)
  const [roadmapLoading, setRoadmapLoading] = useState(false)
  const [startTargetLoading, setStartTargetLoading] = useState(false)
  const [startTargetReady, setStartTargetReady] = useState(false)
  const [semanticBrief, setSemanticBrief] = useState(null)
  const [targetSummary, setTargetSummary] = useState(null)
  const [focusAreas, setFocusAreas] = useState([])
  const [styleDirections, setStyleDirections] = useState([])
  const [trainingTypes, setTrainingTypes] = useState([])
  const [targetGroups, setTargetGroups] = useState([])
  const [skillsCatalog, setSkillsCatalog] = useState([])

  const [activeOffer, setActiveOffer] = useState(null)
  const [activeOfferSlotIndex, setActiveOfferSlotIndex] = useState(null)
  const [gapPrepOpen, setGapPrepOpen] = useState(false)
  const [gapPrepTitle, setGapPrepTitle] = useState('')
  const [gapPrepStageGoal, setGapPrepStageGoal] = useState('')
  const [gapPrepSupplements, setGapPrepSupplements] = useState('')
  const [gapPrepFocusAreaId, setGapPrepFocusAreaId] = useState('')
  const [gapPrepError, setGapPrepError] = useState('')
  const [generatingOfferId, setGeneratingOfferId] = useState(null)
  const [gapAiBusy, setGapAiBusy] = useState(false)
  const [currentEdges, setCurrentEdges] = useState([])
  const [slotQuickCreateIndex, setSlotQuickCreateIndex] = useState(null)
  const [slotQuickCreateDraft, setSlotQuickCreateDraft] = useState(null)
  const [slotQuickSaving, setSlotQuickSaving] = useState(false)
  const [slotQuickError, setSlotQuickError] = useState('')
  const [activePlanningContextLines, setActivePlanningContextLines] = useState([])
  const [compareOpen, setCompareOpen] = useState(false)
  const [comparePayload, setComparePayload] = useState(null)
  const [compareSource, setCompareSource] = useState('manual')
  const [comparing, setComparing] = useState(false)
  const [compareApplying, setCompareApplying] = useState(false)
  const [proposedPathQa, setProposedPathQa] = useState(null)

  const loadGraph = useCallback(async () => {
    if (!graphId) return
    setBusy(true)
    setLoadErr('')
    try {
      const [graph, edges] = await Promise.all([
        api.getExerciseProgressionGraph(Number(graphId)),
        api.listExerciseProgressionEdges(Number(graphId)),
      ])
      const edgeList = Array.isArray(edges) ? edges : []
      setCurrentEdges(edgeList)
      setGraphMeta(graph)
      const hydrated = hydrateProgressionGraphDraft({
        artifact: graph?.planning_roadmap,
        edges: edgeList,
        graphName: graph?.name,
      })
      setDraft(hydrated)
      setStartTargetReady(
        Boolean((hydrated.startSituation || '').trim() && (hydrated.targetState || '').trim()),
      )
      const findings = graph?.planning_roadmap?.last_findings
      if (findings) setPathQa(findings)
    } catch (e) {
      setLoadErr(e.message || 'Graph konnte nicht geladen werden')
      setDraft(null)
    } finally {
      setBusy(false)
    }
  }, [graphId])

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

  useEffect(() => {
    let cancelled = false
    Promise.all([
      api.listFocusAreas({ status: 'active' }),
      api.listStyleDirections({ status: 'active' }),
      api.listTrainingTypes({ status: 'active' }),
      api.listTargetGroups({ status: 'active' }),
      api.listSkillsCatalog({ status: 'active' }),
    ])
      .then(([fa, sd, tt, tg, sk]) => {
        if (cancelled) return
        setFocusAreas(Array.isArray(fa) ? fa : [])
        setStyleDirections(Array.isArray(sd) ? sd : [])
        setTrainingTypes(Array.isArray(tt) ? tt : [])
        setTargetGroups(Array.isArray(tg) ? tg : [])
        setSkillsCatalog(Array.isArray(sk) ? sk : [])
      })
      .catch(() => {
        if (!cancelled) {
          setFocusAreas([])
          setStyleDirections([])
          setTrainingTypes([])
          setTargetGroups([])
          setSkillsCatalog([])
        }
      })
    return () => {
      cancelled = true
    }
  }, [])

  const patchDraft = useCallback((patchFn) => {
    setDraft((prev) => {
      if (!prev) return prev
      const next = patchFn(prev)
      return { ...next, dirty: true, findingsStale: true }
    })
  }, [])

  const gapContextParams = useMemo(() => {
    if (!draft) return {}
    return {
      goalQuery: draft.goalQuery,
      semanticBrief,
      graphId,
      pathSteps: slotsAsPathStepRows(draft),
      editableMajorSteps: draft.majorSteps,
      progressionRoadmap: draft.progressionRoadmap,
      startSituation: draft.startSituation,
      targetState: draft.targetState,
      roadmapNotes: draft.roadmapNotes,
    }
  }, [draft, semanticBrief, graphId])

  const handlePickExercise = async (exercise) => {
    if (!pickContext || !exercise?.id) return
    const { slotIndex, role } = pickContext
    const entry = librarySlotExercise({
      exerciseId: exercise.id,
      exerciseTitle: exercise.title || `Übung #${exercise.id}`,
    })
    patchDraft((d) => {
      const slots = d.slots.map((s, i) => {
        if (i !== slotIndex) return s
        if (role === 'primary') return { ...s, primary: entry }
        const siblings = [...(s.siblings || [])]
        if (!siblings.some((x) => x.exerciseId === entry.exerciseId)) siblings.push(entry)
        return { ...s, siblings }
      })
      return syncProgressionRoadmapFromSlots({ ...d, slots })
    })
    setPickContext(null)
  }

  const handlePatchLearningGoal = (slotIndex, value) => {
    patchDraft((d) => patchSlotInDraft(d, slotIndex, { learning_goal: value }))
  }

  const handlePatchPhase = (slotIndex, value) => {
    patchDraft((d) => patchSlotInDraft(d, slotIndex, { phase: value }))
  }

  const handleMoveSlot = (slotIndex, dir) => {
    patchDraft((d) => moveSlotInDraft(d, slotIndex, dir))
  }

  const handleRemoveSlot = (slotIndex) => {
    if ((draft?.slots?.length || 0) <= 2) {
      alert('Mindestens zwei Slots müssen bleiben.')
      return
    }
    if (!window.confirm(`Slot ${slotIndex + 1} wirklich entfernen?`)) return
    patchDraft((d) => removeSlotFromDraft(d, slotIndex))
  }

  const handleInsertAfter = (slotIndex) => {
    if ((draft?.slots?.length || 0) >= SLOT_MAX) {
      alert(`Maximal ${SLOT_MAX} Slots.`)
      return
    }
    patchDraft((d) => insertSlotInDraft(d, slotIndex))
  }

  const handleAddSlot = () => {
    if ((draft?.slots?.length || 0) >= SLOT_MAX) {
      alert(`Maximal ${SLOT_MAX} Slots.`)
      return
    }
    patchDraft((d) => addSlotToDraft(d))
  }

  const handleClearPrimary = (slotIndex) => {
    patchDraft((d) => {
      const slots = d.slots.map((s, i) =>
        i === slotIndex
          ? {
              ...s,
              primary: {
                kind: 'empty',
                exerciseId: null,
                variantId: null,
                exerciseTitle: '',
                variantName: null,
                proposalKey: null,
                aiSuggestion: null,
              },
              siblings: [],
            }
          : s,
      )
      return syncProgressionRoadmapFromSlots({ ...d, slots })
    })
  }

  const handleRemoveSibling = (slotIndex, sibIdx) => {
    patchDraft((d) => {
      const slots = d.slots.map((s, i) => {
        if (i !== slotIndex) return s
        return { ...s, siblings: s.siblings.filter((_, j) => j !== sibIdx) }
      })
      return { ...d, slots }
    })
  }

  const validMajorSteps = useMemo(() => {
    if (!draft?.slots) return []
    return draft.slots.filter((s) => (s.learning_goal || '').trim().length >= 3)
  }, [draft?.slots])

  const catalogCtx = draft?.planningCatalogContext || EMPTY_PLANNING_CATALOG_CONTEXT

  const patchCatalogDimension = (key, value) => {
    patchDraft((d) => ({
      ...d,
      dirty: true,
      planningCatalogContext: {
        ...(d.planningCatalogContext || EMPTY_PLANNING_CATALOG_CONTEXT),
        [key]: setCatalogSelectItems(d.planningCatalogContext?.[key], value),
      },
    }))
  }

  const catalogApiPayload = useMemo(
    () => planningCatalogContextToApi(catalogCtx),
    [catalogCtx],
  )

  const runAnalyzeStartTarget = async () => {
    const q = (draft?.goalQuery || '').trim()
    if (q.length < 3) {
      alert('Ziel-Anfrage: mindestens 3 Zeichen.')
      return
    }
    setStartTargetLoading(true)
    setActionErr('')
    try {
      const res = await api.suggestProgressionPath({
        query: q,
        max_steps: draft.maxSteps || 5,
        include_llm_intent: false,
        include_path_qa: false,
        include_llm_path_qa: false,
        include_path_reorder: false,
        include_ai_gap_fill: false,
        include_roadmap_preview: false,
        include_llm_roadmap: false,
        include_llm_start_target: true,
        start_target_only: true,
        progression_graph_id: Number(graphId),
        ...roadmapStructuredPayload(draft.startSituation, draft.targetState, draft.roadmapNotes),
        ...catalogApiPayload,
      })
      const roadmap = res?.progression_roadmap
      if (!roadmap) throw new Error('Keine Start/Ziel-Analyse in der Antwort')
      setDraft((prev) => {
        const structured = applyResolvedStructuredToDraft(
          { ...prev, progressionRoadmap: roadmap },
          roadmap,
        )
        return { ...structured, dirty: true, findingsStale: true }
      })
      setStartTargetReady(true)
      setSemanticBrief(res?.semantic_brief_summary || null)
    } catch (e) {
      setActionErr(e.message || 'Start/Ziel-Analyse fehlgeschlagen')
    } finally {
      setStartTargetLoading(false)
    }
  }

  const runRoadmapGenerate = async () => {
    const q = (draft?.goalQuery || '').trim()
    if (q.length < 3) {
      alert('Ziel-Anfrage: mindestens 3 Zeichen.')
      return
    }
    const fieldsEmpty = !(draft.startSituation || '').trim() && !(draft.targetState || '').trim()
    setRoadmapLoading(true)
    setActionErr('')
    try {
      const res = await api.suggestProgressionPath({
        query: q,
        max_steps: draft.maxSteps || 5,
        include_llm_intent: true,
        include_path_qa: false,
        include_llm_path_qa: false,
        include_path_reorder: false,
        include_ai_gap_fill: false,
        include_roadmap_preview: true,
        include_llm_roadmap: true,
        include_llm_start_target: fieldsEmpty,
        roadmap_only: true,
        progression_graph_id: Number(graphId),
        ...roadmapStructuredPayload(draft.startSituation, draft.targetState, draft.roadmapNotes),
        ...catalogApiPayload,
      })
      const roadmap = res?.progression_roadmap
      if (!roadmap) throw new Error('Keine Roadmap in der Antwort')
      const majorCount = (roadmap?.roadmap?.major_steps || []).length
      if (majorCount < SLOT_MIN) throw new Error('Roadmap hat zu wenig Stufen.')
      const preservedArtifact = buildPlanningArtifactFromDraft(draft) || {}
      let startSituation = draft.startSituation
      let targetState = draft.targetState
      let roadmapNotes = draft.roadmapNotes
      if (fieldsEmpty) {
        const patch = applyResolvedStructuredToDraft(
          { startSituation, targetState, roadmapNotes },
          roadmap,
        )
        startSituation = patch.startSituation
        targetState = patch.targetState
        roadmapNotes = patch.roadmapNotes
        setStartTargetReady(true)
      }
      const hydrated = hydrateProgressionGraphDraft({
        artifact: {
          ...preservedArtifact,
          goal_query: q,
          progression_roadmap: roadmap,
          start_situation: startSituation,
          target_state: targetState,
          roadmap_notes: roadmapNotes,
          max_steps: majorCount || draft.maxSteps,
        },
        edges: currentEdges,
        graphName: draft.graphName,
      })
      const withPhases = syncSlotPhasesFromRoadmap(hydrated, roadmap)
      setDraft({ ...withPhases, goalQuery: q, maxSteps: majorCount || withPhases.maxSteps, dirty: true, findingsStale: true })
      setSemanticBrief(res?.semantic_brief_summary || null)
    } catch (e) {
      setActionErr(e.message || 'Roadmap-Generierung fehlgeschlagen')
    } finally {
      setRoadmapLoading(false)
    }
  }

  const buildEvaluateRequest = (synced, { llmPathQa = true, aiGapFill = true } = {}) => {
    const override = majorStepsToOverridePayload(synced.slots)
    return {
      query: (synced.goalQuery || '').trim(),
      max_steps: synced.slots.length || draft?.maxSteps || 5,
      include_path_qa: true,
      include_llm_path_qa: llmPathQa,
      include_ai_gap_fill: aiGapFill,
      include_path_reorder: false,
      include_llm_intent: false,
      evaluate_only: true,
      evaluate_steps: slotsToEvaluateSteps(synced),
      roadmap_override: override,
      slot_assignments: slotsToSlotAssignments(synced),
      progression_graph_id: Number(graphId),
      ...roadmapStructuredPayload(synced.startSituation, synced.targetState, synced.roadmapNotes),
      ...catalogApiPayload,
    }
  }

  const fetchPathEvaluate = async (synced, options) =>
    api.suggestProgressionPath(buildEvaluateRequest(synced, options))

  const applyEvaluateResult = (synced, res) => {
    setSemanticBrief(res?.semantic_brief_summary || null)
    setPathQa(res?.path_qa || null)
    const { draft: evaluated, remainingOffers } = applyEvaluateResponseToDraft(synced, res)
    return {
      draft: { ...evaluated, lastFindings: res?.path_qa || null, findingsStale: false },
      remainingOffers,
    }
  }

  const runMatchCompareFlow = async (synced, { source = 'match' } = {}) => {
    setMatchNotice('Schritt 1/2: Pfad bewerten (wie „Graph bewerten“)…')
    const baselineRes = await fetchPathEvaluate(synced)
    const { draft: evaluated, remainingOffers } = applyEvaluateResult(synced, baselineRes)
    setDraft(evaluated)
    const mergedAfterEval = mergeGapOffersForDraft(evaluated, baselineRes)
    setGapFillOffers(mergedAfterEval.length > 0 ? mergedAfterEval : remainingOffers)

    setMatchNotice('Schritt 2/2: Slot-Alternativen prüfen…')
    let compareRes
    let reviewError = null
    try {
      const reviewRes = await api.suggestProgressionPath({
        ...buildEvaluateRequest(synced),
        evaluate_only: false,
        unified_slot_review: true,
        baseline_evaluate_steps: slotsToEvaluateSteps(synced),
        baseline_path_qa_snapshot: baselineRes?.path_qa || null,
        baseline_quality_score:
          baselineRes?.path_qa?.quality_score != null
            ? Number(baselineRes.path_qa.quality_score)
            : null,
        include_llm_path_qa: false,
        include_llm_intent: false,
        auto_rematch_after_qa: false,
      })
      if (!reviewRes?.unified_slot_review) {
        reviewError =
          'Slot-Review nicht verfügbar — Backend neu starten/deployen (unified_slot_review fehlt).'
        compareRes = buildProgressionComparePayload(baselineRes, {
          ...reviewRes,
          unified_slot_review: true,
          slot_reviews: [],
          review_error: reviewError,
        })
      } else {
        compareRes = buildProgressionComparePayload(baselineRes, reviewRes)
      }
      setGapFillOffers(mergeGapOffersForDraft(evaluated, baselineRes, reviewRes))
    } catch (e) {
      reviewError = e.message || 'Slot-Review fehlgeschlagen'
      compareRes = buildProgressionComparePayload(baselineRes, {
        unified_slot_review: true,
        slot_reviews: [],
        review_error: reviewError,
        path_qa: baselineRes?.path_qa,
      })
    }

    presentMatchCompare(compareRes, { source, reviewError })
    return compareRes
  }

  const presentMatchCompare = (res, { source = 'manual', reviewError = null } = {}) => {
    setSemanticBrief(res?.semantic_brief_summary || null)
    setTargetSummary(res?.target_profile_summary || null)
    setComparePayload(reviewError ? { ...res, review_error: reviewError } : res)
    setCompareSource(source)
    setProposedPathQa(res?.proposed_path_qa_pipeline || null)
    setCompareOpen(true)

    const baselineQa = res?.baseline_path_qa || null
    const slotReviews = res?.slot_reviews || []
    const autoCount = slotReviews.filter((r) => r?.library_alternative?.auto_select).length
    const diffCount = autoCount || res?.slot_diff_count || 0
    const rejectedCount = res?.slot_diff_count_rejected ?? rejectedCompareDiffs(res).length
    const problemCount = res?.match_summary?.problem_slot_count
      ?? (res?.problem_slots ? Object.keys(res.problem_slots).length : 0)
    const bPct = pathQaQualityPercent(baselineQa)
    let notice = reviewError
      ? `Match: Dialog geöffnet — ${reviewError}`
      : slotReviews.length > 0
        ? `Match: ${slotReviews.length} Slot(s) geprüft, ${autoCount} Empfehlung(en) vorausgewählt.`
        : diffCount > 0
          ? `Match: ${diffCount} Verbesserung(en).`
          : problemCount > 0
            ? `Match: ${problemCount} Schachstelle(n), keine bessere Bibliotheks-Alternative.`
            : 'Match: Pfad geprüft — siehe Dialog.'
    if (rejectedCount > 0) {
      notice += ` ${rejectedCount} Vorschlag/Vorschläge verworfen (Verschlechterung oder neutral).`
    }
    const gapCount = collectGapOffersFromApiResponse(res).length
    if (gapCount > 0) {
      notice += ` ${gapCount} KI-Angebot(e) für leere Slots im Panel „Graph-Bewertung“.`
    }
    setMatchNotice(notice)
  }

  const runMatch = async () => {
    const q = (draft?.goalQuery || '').trim()
    if (q.length < 3) {
      alert('Ziel-Anfrage: mindestens 3 Zeichen.')
      return
    }
    if (validMajorSteps.length < 2) {
      alert('Mindestens zwei Slots mit Lernziel (je 3+ Zeichen) nötig.')
      return
    }
    setMatching(true)
    setActionErr('')
    setMatchNotice('')
    try {
      const synced = syncProgressionRoadmapFromSlots(draft)
      setProposedPathQa(null)
      await runMatchCompareFlow(synced, { source: 'match' })
    } catch (e) {
      setActionErr(e.message || 'Übungs-Match fehlgeschlagen')
    } finally {
      setMatching(false)
    }
  }

  const runOptimizeCompare = async () => {
    const q = (draft?.goalQuery || '').trim()
    if (q.length < 3) {
      alert('Ziel-Anfrage: mindestens 3 Zeichen.')
      return
    }
    if (validMajorSteps.length < 2) {
      alert('Mindestens zwei Slots mit Lernziel (je 3+ Zeichen) nötig.')
      return
    }
    setComparing(true)
    setActionErr('')
    setMatchNotice('')
    try {
      const synced = syncProgressionRoadmapFromSlots(draft)
      setProposedPathQa(null)
      await runMatchCompareFlow(synced, { source: 'manual' })
    } catch (e) {
      setActionErr(e.message || 'Optimierungs-Vergleich fehlgeschlagen')
    } finally {
      setComparing(false)
    }
  }

  const applyOptimizeCompare = async (selectedMajorIndices) => {
    if (!comparePayload || !draft) return
    setCompareApplying(true)
    setMatchNotice('Übernahme: Slots aktualisieren …')
    try {
      const synced = syncProgressionRoadmapFromSlots(draft)
      const nextDraft = comparePayload?.unified_slot_review
        ? applySelectedSlotSuggestions(synced, comparePayload, selectedMajorIndices)
        : applySelectedCompareSteps(
            synced,
            comparePayload.proposed_steps || comparePayload.steps,
            selectedMajorIndices,
          )
      const syncedNext = syncProgressionRoadmapFromSlots(nextDraft)

      setDraft({ ...syncedNext, dirty: false, findingsStale: true })
      setCompareOpen(false)
      setComparePayload(null)
      setProposedPathQa(null)

      await saveProgressionGraphDraft(api, graphId, { ...syncedNext, findingsStale: true })
      setMatchNotice(
        'Übernommen und gespeichert. Bewertung bezieht sich noch auf den vorherigen Stand — bitte „Graph bewerten“.',
      )
    } catch (e) {
      setActionErr(e.message || 'Übernahme fehlgeschlagen')
    } finally {
      setCompareApplying(false)
    }
  }

  const runEvaluate = async () => {
    const q = (draft?.goalQuery || '').trim()
    if (q.length < 3) {
      alert('Ziel-Anfrage: mindestens 3 Zeichen.')
      return
    }
    setEvaluating(true)
    setActionErr('')
    setProposedPathQa(null)
    try {
      const synced = syncProgressionRoadmapFromSlots(draft)
      const res = await fetchPathEvaluate(synced)
      const { draft: evaluated, remainingOffers } = applyEvaluateResult(synced, res)
      setDraft(evaluated)
      const mergedOffers = mergeGapOffersForDraft(evaluated, res)
      setGapFillOffers(mergedOffers.length > 0 ? mergedOffers : remainingOffers)
    } catch (e) {
      setActionErr(e.message || 'Bewertung fehlgeschlagen')
    } finally {
      setEvaluating(false)
    }
  }

  const handleSave = async () => {
    if (!draft || !graphId) return
    setBusy(true)
    setActionErr('')
    try {
      await saveProgressionGraphDraft(api, graphId, { ...draft, lastFindings: pathQa })
      await loadGraph()
      if (typeof onSaved === 'function') await onSaved()
      alert('Progressionsgraph gespeichert.')
    } catch (e) {
      setActionErr(e.message || 'Speichern fehlgeschlagen')
    } finally {
      setBusy(false)
    }
  }

  const handleApplyGapOffer = (offer, slotIndex) => {
    setDraft((prev) => {
      const next = applyGapOfferToDraft(prev, offer, { slotIndex })
      return { ...next, dirty: true, findingsStale: true }
    })
    setGapFillOffers((prev) => prev.filter((o) => o.offer_id !== offer?.offer_id))
  }

  const handleInsertGapSlot = (offer) => {
    if ((draft?.slots?.length || 0) >= SLOT_MAX) {
      alert(`Maximal ${SLOT_MAX} Slots — zuerst einen Slot entfernen.`)
      return
    }
    setDraft((prev) => {
      const next = applyGapOfferToDraft(prev, offer, { insertNewSlot: true })
      return { ...next, dirty: true, findingsStale: true }
    })
    setGapFillOffers((prev) => prev.filter((o) => o.offer_id !== offer?.offer_id))
  }

  const slotOfferContext = (slotIndex) => {
    const slot = draft?.slots?.[slotIndex]
    if (!draft || !slot) return null
    const goalForAi =
      buildSlotGapGoalForAi(draft, slotIndex, { goalQuery: draft.goalQuery }) ||
      slot.learning_goal
    const priorSlot =
      slotIndex > 0 && draft.slots[slotIndex - 1]
        ? draft.slots[slotIndex - 1]
        : null
    return {
      offer_id: `slot-${slotIndex}`,
      title_hint: slot.primary?.exerciseTitle || slot.learning_goal,
      roadmap_major_step_index: slot.majorStepIndex,
      phase: slot.phase,
      source: 'roadmap_unfilled',
      goal_for_ai: goalForAi,
      sketch: goalForAi,
      from_title: priorSlot?.primary?.exerciseTitle || null,
    }
  }

  const openGapFillPrep = (offer, slotIndex = null) => {
    const defaultFocus = resolveDefaultFocusAreaId(targetSummary, focusAreas)
    setActiveOffer(offer)
    setActiveOfferSlotIndex(slotIndex)
    setGapPrepTitle((offer?.title_hint || '').trim())
    setGapPrepStageGoal(initialStageLearningGoalFromOffer(offer, gapContextParams))
    setGapPrepSupplements('')
    setGapPrepFocusAreaId(defaultFocus ? String(defaultFocus) : '')
    setActivePlanningContextLines(gapOfferContextDisplayLines(offer, gapContextParams))
    setGapPrepError('')
    setGapPrepOpen(true)
  }

  const runGapFillAiSuggest = async (offer, prep, slotIndex) => {
    const title = (prep?.title || offer?.title_hint || '').trim()
    if (title.length < 3) {
      alert('Titel: mindestens 3 Zeichen.')
      return
    }
    const supplements = (prep?.supplements || '').trim()
    const stageGoal = (prep?.stageLearningGoal || '').trim()
    let goalText = (offer?.goal_for_ai || offer?.sketch || '').trim()
    if (supplements) {
      goalText = `${goalText}\n\nTrainer-Ergänzungen:\n${supplements}`.trim()
    }
    const focusId =
      prep?.focusAreaId != null && Number.isFinite(Number(prep.focusAreaId))
        ? Number(prep.focusAreaId)
        : resolveDefaultFocusAreaId(targetSummary, focusAreas)
    if (!focusId) {
      alert('Bitte einen Fokusbereich wählen.')
      return
    }
    const focusRow = (focusAreas || []).find((x) => Number(x.id) === focusId)
    const focusHint = (focusRow?.name || offer?.primary_topic || '').trim()

    setGapAiBusy(true)
    setGeneratingOfferId(offer?.offer_id || null)
    setGapPrepError('')
    setSlotQuickError('')
    const contextParams = {
      ...gapContextParams,
      stageLearningGoalOverride: stageGoal,
      gapTrainerSupplements: supplements,
    }
    setActivePlanningContextLines(gapOfferContextDisplayLines(offer, contextParams))
    try {
      const planningContext = buildPathGapPlanningContextForAi({
        offer,
        ...contextParams,
      })
      const aiRes = await api.suggestExerciseAi({
        title,
        goal: goalText || undefined,
        execution: '',
        preparation: '',
        trainer_notes: supplements || '',
        focus_area_hint: focusHint || undefined,
        focus_areas_context: [{ focus_area_id: focusId, is_primary: true }],
        planning_context: planningContext || undefined,
        include_summary: true,
        include_skills: true,
        include_instructions: true,
      })
      const preview = buildQuickCreateAiPreview(aiRes, { sketchPlain: goalText })
      if (!preview.hasSummaryProposal && !preview.hasInstructionChoices && !preview.hasSkillChoices) {
        throw new Error('Die KI lieferte keinen verwertbaren Vorschlag.')
      }
      const aiDraft = aiPreviewToQuickCreateDraft(preview, {
        title,
        focusAreaId: focusId,
        sketchPlain: goalText,
      })
      const enrichedOffer = {
        ...offer,
        proposal_title: title,
        ai_suggestion: aiDraft,
        has_ai_payload: true,
      }
      const resolvedSlot =
        slotIndex != null && Number.isFinite(slotIndex)
          ? slotIndex
          : activeOfferSlotIndex != null && Number.isFinite(activeOfferSlotIndex)
            ? activeOfferSlotIndex
            : null
      if (resolvedSlot != null) {
        setSlotQuickCreateIndex(resolvedSlot)
        setDraft((prev) => ({
          ...applyGapOfferToDraft(prev, enrichedOffer, { slotIndex: resolvedSlot }),
          findingsStale: true,
        }))
      }
      setSlotQuickCreateDraft(aiDraft)
      setGapFillOffers((prev) => prev.filter((o) => o.offer_id !== offer?.offer_id))
      setGapPrepOpen(false)
    } catch (e) {
      setGapPrepError(e.message || 'KI-Anlage fehlgeschlagen')
    } finally {
      setGapAiBusy(false)
      setGeneratingOfferId(null)
    }
  }

  const openSlotQuickCreate = (slotIndex) => {
    const slot = draft?.slots?.[slotIndex]
    if (!slot) return
    const primary = slot.primary
    const offer = slotOfferContext(slotIndex)
    setSlotQuickCreateIndex(slotIndex)
    setSlotQuickError('')
    setActiveOffer(offer)
    setActiveOfferSlotIndex(slotIndex)
    setActivePlanningContextLines(gapOfferContextDisplayLines(offer, gapContextParams))

    if (primary?.kind === 'proposal' && primary.aiSuggestion) {
      const focusId = resolveDefaultFocusAreaId(targetSummary, focusAreas)
      const draftReady = ensureQuickCreateDraftFromAiSuggestion(primary.aiSuggestion, {
        title: primary.exerciseTitle || slot.learning_goal,
        focusAreaId: focusId,
        sketchPlain: (offer?.goal_for_ai || slot.learning_goal || '').trim(),
      })
      if (draftReady) {
        setSlotQuickCreateDraft(draftReady)
        return
      }
    }

    openGapFillPrep(offer, slotIndex)
  }

  const applySlotQuickCreate = async () => {
    if (slotQuickCreateIndex == null || !slotQuickCreateDraft) return
    setSlotQuickSaving(true)
    setSlotQuickError('')
    try {
      const graphVis = (graphMeta?.visibility || 'private').trim().toLowerCase()
      const graphClubId =
        graphMeta?.club_id != null
          ? graphMeta.club_id
          : graphVis === 'club'
            ? getDefaultClubIdForGovernanceForms(user)
            : null
      const payload = buildQuickCreateExercisePayloadFromDraft(slotQuickCreateDraft, {
        visibility: graphVis,
        clubId: graphClubId,
      })
      const created = await api.createExercise(payload)
      if (!created?.id) throw new Error('Anlegen fehlgeschlagen')
      setDraft((prev) => ({
        ...setSlotPrimaryLibrary(prev, slotQuickCreateIndex, created),
        dirty: true,
        findingsStale: true,
      }))
      setSlotQuickCreateDraft(null)
      setSlotQuickCreateIndex(null)
      setActiveOffer(null)
      setActiveOfferSlotIndex(null)
      setActivePlanningContextLines([])
    } catch (e) {
      const msg = e.message || 'Übung konnte nicht angelegt werden'
      setSlotQuickError(msg)
      alert(msg)
    } finally {
      setSlotQuickSaving(false)
    }
  }

  const submitGapFillPrep = async () => {
    const title = (gapPrepTitle || '').trim()
    if (title.length < 3) {
      alert('Titel: mindestens 3 Zeichen.')
      return
    }
    const focusId = parseInt(String(gapPrepFocusAreaId).trim(), 10)
    if (!Number.isFinite(focusId) || focusId < 1) {
      alert('Bitte einen Fokusbereich wählen.')
      return
    }
    if (!activeOffer) return
    await runGapFillAiSuggest(
      activeOffer,
      {
        title,
        stageLearningGoal: (gapPrepStageGoal || '').trim(),
        supplements: (gapPrepSupplements || '').trim(),
        focusAreaId: focusId,
      },
      activeOfferSlotIndex,
    )
  }

  if (loadErr) {
    return (
      <div className="card">
        <p className="form-error">{loadErr}</p>
        <Link to="/exercises" className="btn btn-secondary">
          Zurück
        </Link>
      </div>
    )
  }

  if (!draft) {
    return (
      <div style={{ display: 'flex', justifyContent: 'center', padding: '40px' }}>
        <div className="spinner" />
      </div>
    )
  }

  return (
    <div>
      {!embedded ? (
        <div style={{ marginBottom: '12px', display: 'flex', justifyContent: 'space-between', alignItems: 'flex-start', flexWrap: 'wrap', gap: '8px' }}>
          <div>
            <h2 style={{ margin: 0, fontSize: '1.15rem' }}>
              {graphMeta?.name || draft.graphName || `Graph #${graphId}`}
            </h2>
            <p style={{ margin: '4px 0 0', fontSize: '12px', color: 'var(--text3)' }}>
              Roadmap-Slots · KI-Match · Graph-Bewertung (max. {SLOT_MAX} Slots)
            </p>
          </div>
          <Link to="/exercises" className="btn btn-secondary" style={{ fontSize: '12px' }}>
            Zur Übersicht
          </Link>
        </div>
      ) : null}

      {actionErr ? (
        <p className="form-error" style={{ marginTop: 0 }}>
          {actionErr}
        </p>
      ) : null}

      <div
        className="progression-graph-editor-grid"
        style={{
          display: 'grid',
          gridTemplateColumns: 'minmax(0, 1fr) minmax(280px, 340px)',
          gap: '14px',
          alignItems: 'start',
        }}
      >
        <div>
          <div className="card" style={{ marginBottom: '12px' }}>
            <h3 style={{ marginTop: 0, fontSize: '1rem' }}>Ziel & Roadmap</h3>
            <div
              style={{
                display: 'flex',
                flexWrap: 'wrap',
                gap: '10px',
                alignItems: 'flex-end',
                marginBottom: '10px',
              }}
            >
              <div className="form-row" style={{ flex: '2 1 240px', marginBottom: 0 }}>
                <label className="form-label">Ziel / Entwicklungsrichtung</label>
                <input
                  className="form-input"
                  value={draft.goalQuery}
                  disabled={busy}
                  onChange={(e) => patchDraft((d) => ({ ...d, goalQuery: e.target.value }))}
                  placeholder="z. B. Von Erlernen bis zur Perfektion des Fußtritts Mae Geri …"
                />
              </div>
              <div className="form-row" style={{ flex: '0 1 100px', marginBottom: 0 }}>
                <label className="form-label">Stufen (Slots)</label>
                <input
                  type="number"
                  min={SLOT_MIN}
                  max={SLOT_MAX}
                  className="form-input"
                  value={draft.maxSteps}
                  disabled={busy}
                  onChange={(e) =>
                    patchDraft((d) => ({
                      ...d,
                      maxSteps: Math.max(SLOT_MIN, Math.min(SLOT_MAX, Number(e.target.value) || 5)),
                    }))
                  }
                />
              </div>
            </div>
            <div
              style={{
                display: 'grid',
                gridTemplateColumns: 'repeat(auto-fit, minmax(220px, 1fr))',
                gap: '10px',
              }}
            >
              <div className="form-row" style={{ marginBottom: 0 }}>
                <label className="form-label">Startpunkt / Ausgangslage</label>
                <textarea
                  className="form-input"
                  rows={2}
                  value={draft.startSituation}
                  disabled={busy}
                  onChange={(e) => patchDraft((d) => ({ ...d, startSituation: e.target.value }))}
                  placeholder="z. B. gleichartige Steppbewegung, vorhersehbar"
                />
              </div>
              <div className="form-row" style={{ marginBottom: 0 }}>
                <label className="form-label">Zielzustand</label>
                <textarea
                  className="form-input"
                  rows={2}
                  value={draft.targetState}
                  disabled={busy}
                  onChange={(e) => patchDraft((d) => ({ ...d, targetState: e.target.value }))}
                  placeholder="z. B. dynamische Bewegung mit explosivem Angriff und Ausweichen"
                />
              </div>
              <div className="form-row" style={{ marginBottom: 0 }}>
                <label className="form-label">Ergänzungen (Fokus, Gruppe, Besonderheiten)</label>
                <textarea
                  className="form-input"
                  rows={2}
                  value={draft.roadmapNotes}
                  disabled={busy}
                  onChange={(e) => patchDraft((d) => ({ ...d, roadmapNotes: e.target.value }))}
                  placeholder="optional: Altersgruppe, Kumite-Kontext, Trainingsfokus …"
                />
              </div>
            </div>
            <PlanningCatalogContextFields
              catalogCtx={catalogCtx}
              onPatchDimension={patchCatalogDimension}
              focusAreas={focusAreas}
              styleDirections={styleDirections}
              trainingTypes={trainingTypes}
              targetGroups={targetGroups}
              disabled={busy}
              helperText="Planungskontext steuert Bibliotheks-Matching (Fokusbereich, Stil, Trainingsstil, Zielgruppe) — unabhängig von Technik-Pfaden wie Mae Geri. Wird mit dem Graph gespeichert."
            />
            <p style={{ fontSize: '11px', color: 'var(--text3)', margin: '8px 0 0', lineHeight: 1.4 }}>
              Optional zuerst „Start/Ziel analysieren“, anpassen, dann Roadmap-Stufen. Sind Start und Ziel leer,
              geschieht die Analyse beim Roadmap-Vorschlag automatisch. Manuelle Eingaben haben Vorrang.
            </p>
            <div style={{ display: 'flex', flexWrap: 'wrap', gap: '8px', marginTop: '10px', alignItems: 'center' }}>
              <button
                type="button"
                className="btn btn-secondary"
                disabled={busy || startTargetLoading}
                onClick={runAnalyzeStartTarget}
                title="Nur Ausgangslage, Zielzustand und Ergänzungen per KI — ohne Roadmap-Stufen"
              >
                {startTargetLoading ? 'Analyse…' : 'Start/Ziel analysieren'}
              </button>
              <button
                type="button"
                className="btn btn-secondary"
                disabled={busy || roadmapLoading}
                onClick={runRoadmapGenerate}
              >
                {roadmapLoading ? 'Roadmap…' : 'Roadmap generieren'}
              </button>
              {startTargetReady ? (
                <span className="exercise-tag" style={{ borderColor: 'var(--accent)' }}>
                  Start/Ziel bereit
                </span>
              ) : null}
              <button
                type="button"
                className="btn btn-secondary"
                disabled={busy || matching}
                onClick={runMatch}
                title={
                  draftHasLibrarySlotAssignments(draft)
                    ? 'Voller Match mit Auto-Optimierung — bei Abweichungen öffnet sich der Vergleichsdialog'
                    : 'Bibliotheks-Übungen für leere Slots finden'
                }
              >
                {matching ? 'Match…' : 'Übungen matchen'}
              </button>
              {draftHasLibrarySlotAssignments(draft) ? (
                <button
                  type="button"
                  className="btn btn-secondary"
                  disabled={busy || comparing || matching}
                  onClick={runOptimizeCompare}
                  title="Aktuellen Pfad vs. voller Match mit Auto-Optimierung — du wählst pro Slot"
                >
                  {comparing ? 'Vergleich…' : 'Optimierung vergleichen'}
                </button>
              ) : null}
              <button type="button" className="btn btn-primary" disabled={busy} onClick={handleSave}>
                {busy ? 'Speichern…' : 'Graph speichern'}
              </button>
            </div>
            {matchNotice ? (
              <p style={{ margin: '8px 0 0', fontSize: '11px', color: 'var(--accent-dark)' }}>{matchNotice}</p>
            ) : null}
            {draft.dirty ? (
              <p style={{ margin: '8px 0 0', fontSize: '11px', color: 'var(--accent-dark)' }}>
                Ungespeicherte Änderungen
              </p>
            ) : null}
          </div>

          <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: '8px' }}>
            <h3 style={{ margin: 0, fontSize: '1rem' }}>Slots ({draft.slots.length})</h3>
            <button
              type="button"
              className="btn btn-secondary"
              style={{ fontSize: '12px' }}
              disabled={busy || draft.slots.length >= SLOT_MAX}
              onClick={handleAddSlot}
            >
              Slot am Ende
            </button>
          </div>

          {draft.slots.map((slot, idx) => (
            <ProgressionSlotCard
              key={`slot-${idx}`}
              slot={slot}
              slotIndex={idx}
              slotCount={draft.slots.length}
              disabled={busy}
              onPickPrimary={(i) => setPickContext({ slotIndex: i, role: 'primary' })}
              onPickSibling={(i) => setPickContext({ slotIndex: i, role: 'sibling' })}
              onClearPrimary={handleClearPrimary}
              onRemoveSibling={handleRemoveSibling}
              onPatchLearningGoal={handlePatchLearningGoal}
              onPatchPhase={handlePatchPhase}
              onMoveUp={(i) => handleMoveSlot(i, -1)}
              onMoveDown={(i) => handleMoveSlot(i, 1)}
              onRemoveSlot={handleRemoveSlot}
              onInsertAfter={handleInsertAfter}
              onCreateFromProposal={openSlotQuickCreate}
            />
          ))}
        </div>

        <ProgressionFindingsPanel
          pathQa={pathQa}
          gapFillOffers={gapFillOffers}
          draft={draft}
          slotCount={draft.slots.length}
          loading={evaluating}
          error=""
          evaluationStale={Boolean(draft?.findingsStale)}
          onEvaluate={runEvaluate}
          onApplyGapOffer={handleApplyGapOffer}
          onInsertGapSlot={handleInsertGapSlot}
          onGenerateGapAi={openGapFillPrep}
          onRematchSlots={runMatch}
          onOptimizeCompare={runOptimizeCompare}
          canOptimizeCompare={validMajorSteps.length >= 2}
          optimizeCompareBusy={comparing}
          rematchBusy={matching}
          generatingOfferId={generatingOfferId}
          aiBusy={gapAiBusy}
          evaluateDisabled={busy || !draft.goalQuery?.trim()}
        />
      </div>

      {pickContext ? (
        <ExercisePickerModal
          open
          onClose={() => setPickContext(null)}
          onSelectExercise={handlePickExercise}
        />
      ) : null}

      <ExerciseAiSuggestPreviewModal
        draft={slotQuickCreateDraft}
        onDraftChange={setSlotQuickCreateDraft}
        onDiscard={() => {
          if (slotQuickSaving) return
          setSlotQuickCreateDraft(null)
          setSlotQuickError('')
          if (activeOffer) {
            setGapPrepOpen(true)
          } else {
            setActivePlanningContextLines([])
          }
        }}
        planningContextLines={activePlanningContextLines}
        onApply={applySlotQuickCreate}
        focusAreas={focusAreas}
        skillsCatalog={skillsCatalog}
        dialogTitle="Progressions-Slot — KI-Entwurf bearbeiten"
        hint="Texte prüfen und anpassen, dann als Übung speichern — sie wird dem Slot zugeordnet."
        applyLabel={slotQuickSaving ? 'Wird angelegt …' : 'Anlegen und Slot zuweisen'}
        applyDisabled={slotQuickSaving}
        zIndex={2100}
      />

      <ProgressionOptimizeCompareModal
        open={compareOpen}
        comparison={comparePayload}
        mode={compareSource}
        onClose={() => {
          if (compareApplying) return
          setCompareOpen(false)
          setComparePayload(null)
          setProposedPathQa(null)
        }}
        onApplySelected={applyOptimizeCompare}
        applying={compareApplying}
      />

      <ExerciseGapFillPrepModal
        open={gapPrepOpen}
        offer={activeOffer}
        onClose={() => {
          if (gapAiBusy) return
          setGapPrepOpen(false)
          setGapPrepError('')
        }}
        title={gapPrepTitle}
        onTitleChange={setGapPrepTitle}
        stageLearningGoal={gapPrepStageGoal}
        onStageLearningGoalChange={setGapPrepStageGoal}
        supplements={gapPrepSupplements}
        onSupplementsChange={setGapPrepSupplements}
        focusAreaId={gapPrepFocusAreaId}
        onFocusAreaChange={setGapPrepFocusAreaId}
        focusAreas={focusAreas}
        contextLines={gapOfferContextDisplayLines(activeOffer, gapContextParams)}
        error={gapPrepError}
        busy={gapAiBusy}
        onSubmit={submitGapFillPrep}
      />

      <style>{`
        @media (max-width: 900px) {
          .progression-graph-editor-grid {
            grid-template-columns: 1fr !important;
          }
        }
      `}</style>
    </div>
  )
}