'use client'

import { useState, useEffect, useMemo, useCallback } from 'react'
import {
  Shield, Search, ChevronRight, ArrowLeft, ExternalLink,
  Filter, AlertTriangle, CheckCircle2, Info, Lock,
  FileText, BookOpen, Scale, Plus, Pencil, Trash2, Save, X,
  Zap, BarChart3, Eye, RefreshCw, Clock,
} from 'lucide-react'

// =============================================================================
// TYPES
// =============================================================================

interface OpenAnchor {
  framework: string
  ref: string
  url: string
}

interface EvidenceItem {
  type: string
  description: string
}

interface CanonicalControl {
  id: string
  framework_id: string
  control_id: string
  title: string
  objective: string
  rationale: string
  scope: {
    platforms?: string[]
    components?: string[]
    data_classes?: string[]
  }
  requirements: string[]
  test_procedure: string[]
  evidence: EvidenceItem[]
  severity: string
  risk_score: number | null
  implementation_effort: string | null
  evidence_confidence: number | null
  open_anchors: OpenAnchor[]
  release_state: string
  tags: string[]
  license_rule?: number | null
  source_original_text?: string | null
  source_citation?: Record<string, string> | null
  customer_visible?: boolean
  generation_metadata?: Record<string, unknown> | null
  created_at: string
  updated_at: string
}

interface Framework {
  id: string
  framework_id: string
  name: string
  version: string
  description: string
  release_state: string
}

// =============================================================================
// CONSTANTS
// =============================================================================

const SEVERITY_CONFIG: Record<string, { bg: string; label: string; icon: React.ComponentType<{ className?: string }> }> = {
  critical: { bg: 'bg-red-100 text-red-800', label: 'Kritisch', icon: AlertTriangle },
  high: { bg: 'bg-orange-100 text-orange-800', label: 'Hoch', icon: AlertTriangle },
  medium: { bg: 'bg-yellow-100 text-yellow-800', label: 'Mittel', icon: Info },
  low: { bg: 'bg-green-100 text-green-800', label: 'Niedrig', icon: CheckCircle2 },
}

const EFFORT_LABELS: Record<string, string> = {
  s: 'Klein (S)',
  m: 'Mittel (M)',
  l: 'Gross (L)',
  xl: 'Sehr gross (XL)',
}

const BACKEND_URL = '/api/sdk/v1/canonical'

const EMPTY_CONTROL = {
  framework_id: 'bp_security_v1',
  control_id: '',
  title: '',
  objective: '',
  rationale: '',
  scope: { platforms: [] as string[], components: [] as string[], data_classes: [] as string[] },
  requirements: [''],
  test_procedure: [''],
  evidence: [{ type: '', description: '' }],
  severity: 'medium',
  risk_score: null as number | null,
  implementation_effort: 'm' as string | null,
  open_anchors: [{ framework: '', ref: '', url: '' }],
  release_state: 'draft',
  tags: [] as string[],
}

// =============================================================================
// HELPERS
// =============================================================================

function SeverityBadge({ severity }: { severity: string }) {
  const config = SEVERITY_CONFIG[severity] || SEVERITY_CONFIG.medium
  const Icon = config.icon
  return (
    <span className={`inline-flex items-center gap-1 px-2 py-0.5 rounded text-xs font-medium ${config.bg}`}>
      <Icon className="w-3 h-3" />
      {config.label}
    </span>
  )
}

function StateBadge({ state }: { state: string }) {
  const config: Record<string, string> = {
    draft: 'bg-gray-100 text-gray-600',
    review: 'bg-blue-100 text-blue-700',
    approved: 'bg-green-100 text-green-700',
    deprecated: 'bg-red-100 text-red-600',
    needs_review: 'bg-yellow-100 text-yellow-800',
    too_close: 'bg-red-100 text-red-700',
    duplicate: 'bg-orange-100 text-orange-700',
  }
  const labels: Record<string, string> = {
    needs_review: 'Review noetig',
    too_close: 'Zu aehnlich',
    duplicate: 'Duplikat',
  }
  return (
    <span className={`inline-flex items-center px-2 py-0.5 rounded text-xs font-medium ${config[state] || config.draft}`}>
      {labels[state] || state}
    </span>
  )
}

function LicenseRuleBadge({ rule }: { rule: number | null | undefined }) {
  if (!rule) return null
  const config: Record<number, { bg: string; label: string }> = {
    1: { bg: 'bg-green-100 text-green-700', label: 'Free Use' },
    2: { bg: 'bg-blue-100 text-blue-700', label: 'Zitation' },
    3: { bg: 'bg-amber-100 text-amber-700', label: 'Reformuliert' },
  }
  const c = config[rule]
  if (!c) return null
  return <span className={`inline-flex items-center px-2 py-0.5 rounded text-xs font-medium ${c.bg}`}>{c.label}</span>
}

function getDomain(controlId: string): string {
  return controlId.split('-')[0] || ''
}

// =============================================================================
// CONTROL FORM COMPONENT
// =============================================================================

function ControlForm({
  initial,
  onSave,
  onCancel,
  saving,
}: {
  initial: typeof EMPTY_CONTROL
  onSave: (data: typeof EMPTY_CONTROL) => void
  onCancel: () => void
  saving: boolean
}) {
  const [form, setForm] = useState(initial)
  const [tagInput, setTagInput] = useState(initial.tags.join(', '))
  const [platformInput, setPlatformInput] = useState((initial.scope.platforms || []).join(', '))
  const [componentInput, setComponentInput] = useState((initial.scope.components || []).join(', '))
  const [dataClassInput, setDataClassInput] = useState((initial.scope.data_classes || []).join(', '))

  const handleSave = () => {
    const data = {
      ...form,
      tags: tagInput.split(',').map(t => t.trim()).filter(Boolean),
      scope: {
        platforms: platformInput.split(',').map(t => t.trim()).filter(Boolean),
        components: componentInput.split(',').map(t => t.trim()).filter(Boolean),
        data_classes: dataClassInput.split(',').map(t => t.trim()).filter(Boolean),
      },
      requirements: form.requirements.filter(r => r.trim()),
      test_procedure: form.test_procedure.filter(r => r.trim()),
      evidence: form.evidence.filter(e => e.type.trim() || e.description.trim()),
      open_anchors: form.open_anchors.filter(a => a.framework.trim() || a.ref.trim()),
    }
    onSave(data)
  }

  return (
    <div className="max-w-4xl mx-auto p-6 space-y-6">
      <div className="flex items-center justify-between">
        <h2 className="text-lg font-semibold text-gray-900">
          {initial.control_id ? `Control ${initial.control_id} bearbeiten` : 'Neues Control erstellen'}
        </h2>
        <div className="flex items-center gap-2">
          <button onClick={onCancel} className="px-3 py-1.5 text-sm text-gray-600 border border-gray-300 rounded-lg hover:bg-gray-50">
            <X className="w-4 h-4 inline mr-1" />Abbrechen
          </button>
          <button onClick={handleSave} disabled={saving} className="px-3 py-1.5 text-sm text-white bg-purple-600 rounded-lg hover:bg-purple-700 disabled:opacity-50">
            <Save className="w-4 h-4 inline mr-1" />{saving ? 'Speichern...' : 'Speichern'}
          </button>
        </div>
      </div>

      {/* Basic fields */}
      <div className="grid grid-cols-2 gap-4">
        <div>
          <label className="block text-xs font-medium text-gray-600 mb-1">Control-ID *</label>
          <input
            value={form.control_id}
            onChange={e => setForm({ ...form, control_id: e.target.value.toUpperCase() })}
            placeholder="AUTH-003"
            disabled={!!initial.control_id}
            className="w-full px-3 py-2 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 focus:outline-none disabled:bg-gray-100"
          />
          <p className="text-xs text-gray-400 mt-1">Format: DOMAIN-NNN (z.B. AUTH-003, NET-005)</p>
        </div>
        <div>
          <label className="block text-xs font-medium text-gray-600 mb-1">Titel *</label>
          <input
            value={form.title}
            onChange={e => setForm({ ...form, title: e.target.value })}
            placeholder="Control-Titel"
            className="w-full px-3 py-2 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 focus:outline-none"
          />
        </div>
      </div>

      <div className="grid grid-cols-3 gap-4">
        <div>
          <label className="block text-xs font-medium text-gray-600 mb-1">Schweregrad</label>
          <select value={form.severity} onChange={e => setForm({ ...form, severity: e.target.value })} className="w-full px-3 py-2 text-sm border border-gray-300 rounded-lg">
            <option value="low">Niedrig</option>
            <option value="medium">Mittel</option>
            <option value="high">Hoch</option>
            <option value="critical">Kritisch</option>
          </select>
        </div>
        <div>
          <label className="block text-xs font-medium text-gray-600 mb-1">Risiko-Score (0-10)</label>
          <input
            type="number" min="0" max="10" step="0.5"
            value={form.risk_score ?? ''}
            onChange={e => setForm({ ...form, risk_score: e.target.value ? parseFloat(e.target.value) : null })}
            className="w-full px-3 py-2 text-sm border border-gray-300 rounded-lg"
          />
        </div>
        <div>
          <label className="block text-xs font-medium text-gray-600 mb-1">Aufwand</label>
          <select value={form.implementation_effort || ''} onChange={e => setForm({ ...form, implementation_effort: e.target.value || null })} className="w-full px-3 py-2 text-sm border border-gray-300 rounded-lg">
            <option value="">-</option>
            <option value="s">Klein (S)</option>
            <option value="m">Mittel (M)</option>
            <option value="l">Gross (L)</option>
            <option value="xl">Sehr gross (XL)</option>
          </select>
        </div>
      </div>

      {/* Objective & Rationale */}
      <div>
        <label className="block text-xs font-medium text-gray-600 mb-1">Ziel *</label>
        <textarea
          value={form.objective}
          onChange={e => setForm({ ...form, objective: e.target.value })}
          rows={3}
          className="w-full px-3 py-2 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 focus:outline-none"
        />
      </div>
      <div>
        <label className="block text-xs font-medium text-gray-600 mb-1">Begruendung *</label>
        <textarea
          value={form.rationale}
          onChange={e => setForm({ ...form, rationale: e.target.value })}
          rows={3}
          className="w-full px-3 py-2 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 focus:outline-none"
        />
      </div>

      {/* Scope */}
      <div className="grid grid-cols-3 gap-4">
        <div>
          <label className="block text-xs font-medium text-gray-600 mb-1">Plattformen (komma-getrennt)</label>
          <input value={platformInput} onChange={e => setPlatformInput(e.target.value)} placeholder="web, mobile, api" className="w-full px-3 py-2 text-sm border border-gray-300 rounded-lg" />
        </div>
        <div>
          <label className="block text-xs font-medium text-gray-600 mb-1">Komponenten (komma-getrennt)</label>
          <input value={componentInput} onChange={e => setComponentInput(e.target.value)} placeholder="auth-service, gateway" className="w-full px-3 py-2 text-sm border border-gray-300 rounded-lg" />
        </div>
        <div>
          <label className="block text-xs font-medium text-gray-600 mb-1">Datenklassen (komma-getrennt)</label>
          <input value={dataClassInput} onChange={e => setDataClassInput(e.target.value)} placeholder="credentials, tokens" className="w-full px-3 py-2 text-sm border border-gray-300 rounded-lg" />
        </div>
      </div>

      {/* Requirements */}
      <div>
        <div className="flex items-center justify-between mb-1">
          <label className="text-xs font-medium text-gray-600">Anforderungen</label>
          <button onClick={() => setForm({ ...form, requirements: [...form.requirements, ''] })} className="text-xs text-purple-600 hover:text-purple-800">+ Hinzufuegen</button>
        </div>
        {form.requirements.map((req, i) => (
          <div key={i} className="flex gap-2 mb-2">
            <span className="text-xs text-gray-400 mt-2.5">{i + 1}.</span>
            <input
              value={req}
              onChange={e => { const r = [...form.requirements]; r[i] = e.target.value; setForm({ ...form, requirements: r }) }}
              className="flex-1 px-3 py-2 text-sm border border-gray-300 rounded-lg"
            />
            <button onClick={() => setForm({ ...form, requirements: form.requirements.filter((_, j) => j !== i) })} className="text-red-400 hover:text-red-600">
              <Trash2 className="w-4 h-4" />
            </button>
          </div>
        ))}
      </div>

      {/* Test Procedure */}
      <div>
        <div className="flex items-center justify-between mb-1">
          <label className="text-xs font-medium text-gray-600">Pruefverfahren</label>
          <button onClick={() => setForm({ ...form, test_procedure: [...form.test_procedure, ''] })} className="text-xs text-purple-600 hover:text-purple-800">+ Hinzufuegen</button>
        </div>
        {form.test_procedure.map((step, i) => (
          <div key={i} className="flex gap-2 mb-2">
            <span className="text-xs text-gray-400 mt-2.5">{i + 1}.</span>
            <input
              value={step}
              onChange={e => { const t = [...form.test_procedure]; t[i] = e.target.value; setForm({ ...form, test_procedure: t }) }}
              className="flex-1 px-3 py-2 text-sm border border-gray-300 rounded-lg"
            />
            <button onClick={() => setForm({ ...form, test_procedure: form.test_procedure.filter((_, j) => j !== i) })} className="text-red-400 hover:text-red-600">
              <Trash2 className="w-4 h-4" />
            </button>
          </div>
        ))}
      </div>

      {/* Evidence */}
      <div>
        <div className="flex items-center justify-between mb-1">
          <label className="text-xs font-medium text-gray-600">Nachweisanforderungen</label>
          <button onClick={() => setForm({ ...form, evidence: [...form.evidence, { type: '', description: '' }] })} className="text-xs text-purple-600 hover:text-purple-800">+ Hinzufuegen</button>
        </div>
        {form.evidence.map((ev, i) => (
          <div key={i} className="flex gap-2 mb-2">
            <input
              value={ev.type}
              onChange={e => { const evs = [...form.evidence]; evs[i] = { ...evs[i], type: e.target.value }; setForm({ ...form, evidence: evs }) }}
              placeholder="Typ (z.B. config, test_result)"
              className="w-32 px-3 py-2 text-sm border border-gray-300 rounded-lg"
            />
            <input
              value={ev.description}
              onChange={e => { const evs = [...form.evidence]; evs[i] = { ...evs[i], description: e.target.value }; setForm({ ...form, evidence: evs }) }}
              placeholder="Beschreibung"
              className="flex-1 px-3 py-2 text-sm border border-gray-300 rounded-lg"
            />
            <button onClick={() => setForm({ ...form, evidence: form.evidence.filter((_, j) => j !== i) })} className="text-red-400 hover:text-red-600">
              <Trash2 className="w-4 h-4" />
            </button>
          </div>
        ))}
      </div>

      {/* Open Anchors */}
      <div className="bg-green-50 border border-green-200 rounded-lg p-4">
        <div className="flex items-center justify-between mb-2">
          <div className="flex items-center gap-2">
            <BookOpen className="w-4 h-4 text-green-700" />
            <label className="text-xs font-semibold text-green-900">Open-Source-Referenzen *</label>
          </div>
          <button onClick={() => setForm({ ...form, open_anchors: [...form.open_anchors, { framework: '', ref: '', url: '' }] })} className="text-xs text-green-700 hover:text-green-900">+ Hinzufuegen</button>
        </div>
        <p className="text-xs text-green-600 mb-3">Jedes Control braucht mindestens eine offene Referenz (OWASP, NIST, ENISA, etc.)</p>
        {form.open_anchors.map((anchor, i) => (
          <div key={i} className="flex gap-2 mb-2">
            <input
              value={anchor.framework}
              onChange={e => { const a = [...form.open_anchors]; a[i] = { ...a[i], framework: e.target.value }; setForm({ ...form, open_anchors: a }) }}
              placeholder="Framework (z.B. OWASP ASVS)"
              className="w-40 px-3 py-2 text-sm border border-green-200 rounded-lg bg-white"
            />
            <input
              value={anchor.ref}
              onChange={e => { const a = [...form.open_anchors]; a[i] = { ...a[i], ref: e.target.value }; setForm({ ...form, open_anchors: a }) }}
              placeholder="Referenz (z.B. V2.8)"
              className="w-48 px-3 py-2 text-sm border border-green-200 rounded-lg bg-white"
            />
            <input
              value={anchor.url}
              onChange={e => { const a = [...form.open_anchors]; a[i] = { ...a[i], url: e.target.value }; setForm({ ...form, open_anchors: a }) }}
              placeholder="https://..."
              className="flex-1 px-3 py-2 text-sm border border-green-200 rounded-lg bg-white"
            />
            <button onClick={() => setForm({ ...form, open_anchors: form.open_anchors.filter((_, j) => j !== i) })} className="text-red-400 hover:text-red-600">
              <Trash2 className="w-4 h-4" />
            </button>
          </div>
        ))}
      </div>

      {/* Tags & State */}
      <div className="grid grid-cols-2 gap-4">
        <div>
          <label className="block text-xs font-medium text-gray-600 mb-1">Tags (komma-getrennt)</label>
          <input value={tagInput} onChange={e => setTagInput(e.target.value)} placeholder="mfa, auth, iam" className="w-full px-3 py-2 text-sm border border-gray-300 rounded-lg" />
        </div>
        <div>
          <label className="block text-xs font-medium text-gray-600 mb-1">Status</label>
          <select value={form.release_state} onChange={e => setForm({ ...form, release_state: e.target.value })} className="w-full px-3 py-2 text-sm border border-gray-300 rounded-lg">
            <option value="draft">Draft</option>
            <option value="review">Review</option>
            <option value="approved">Approved</option>
            <option value="deprecated">Deprecated</option>
          </select>
        </div>
      </div>
    </div>
  )
}

// =============================================================================
// CONTROL LIBRARY PAGE
// =============================================================================

export default function ControlLibraryPage() {
  const [frameworks, setFrameworks] = useState<Framework[]>([])
  const [controls, setControls] = useState<CanonicalControl[]>([])
  const [selectedControl, setSelectedControl] = useState<CanonicalControl | null>(null)
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)

  // Filters
  const [searchQuery, setSearchQuery] = useState('')
  const [severityFilter, setSeverityFilter] = useState<string>('')
  const [domainFilter, setDomainFilter] = useState<string>('')

  // CRUD state
  const [mode, setMode] = useState<'list' | 'detail' | 'create' | 'edit'>('list')
  const [saving, setSaving] = useState(false)

  // Generator state
  const [showGenerator, setShowGenerator] = useState(false)
  const [generating, setGenerating] = useState(false)
  const [genResult, setGenResult] = useState<Record<string, unknown> | null>(null)
  const [genDomain, setGenDomain] = useState('')
  const [genMaxControls, setGenMaxControls] = useState(10)
  const [genDryRun, setGenDryRun] = useState(true)
  const [stateFilter, setStateFilter] = useState<string>('')
  const [processedStats, setProcessedStats] = useState<Array<Record<string, unknown>>>([])
  const [showStats, setShowStats] = useState(false)

  // Load data
  const loadData = useCallback(async () => {
    try {
      setLoading(true)
      const [fwRes, ctrlRes] = await Promise.all([
        fetch(`${BACKEND_URL}?endpoint=frameworks`),
        fetch(`${BACKEND_URL}?endpoint=controls`),
      ])

      if (fwRes.ok) setFrameworks(await fwRes.json())
      if (ctrlRes.ok) setControls(await ctrlRes.json())
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Fehler beim Laden')
    } finally {
      setLoading(false)
    }
  }, [])

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

  // Derived: unique domains
  const domains = useMemo(() => {
    const set = new Set(controls.map(c => getDomain(c.control_id)))
    return Array.from(set).sort()
  }, [controls])

  // Filtered controls
  const filteredControls = useMemo(() => {
    return controls.filter(c => {
      if (severityFilter && c.severity !== severityFilter) return false
      if (domainFilter && getDomain(c.control_id) !== domainFilter) return false
      if (stateFilter && c.release_state !== stateFilter) return false
      if (searchQuery) {
        const q = searchQuery.toLowerCase()
        return (
          c.control_id.toLowerCase().includes(q) ||
          c.title.toLowerCase().includes(q) ||
          c.objective.toLowerCase().includes(q) ||
          c.tags.some(t => t.toLowerCase().includes(q))
        )
      }
      return true
    })
  }, [controls, severityFilter, domainFilter, stateFilter, searchQuery])

  // CRUD handlers
  const handleCreate = async (data: typeof EMPTY_CONTROL) => {
    setSaving(true)
    try {
      const res = await fetch(`${BACKEND_URL}?endpoint=create-control`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(data),
      })
      if (!res.ok) {
        const err = await res.json()
        alert(`Fehler: ${err.error || err.details || 'Unbekannt'}`)
        return
      }
      await loadData()
      setMode('list')
    } catch {
      alert('Netzwerkfehler')
    } finally {
      setSaving(false)
    }
  }

  const handleUpdate = async (data: typeof EMPTY_CONTROL) => {
    if (!selectedControl) return
    setSaving(true)
    try {
      const res = await fetch(`${BACKEND_URL}?endpoint=update-control&id=${selectedControl.control_id}`, {
        method: 'PUT',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(data),
      })
      if (!res.ok) {
        const err = await res.json()
        alert(`Fehler: ${err.error || err.details || 'Unbekannt'}`)
        return
      }
      await loadData()
      setSelectedControl(null)
      setMode('list')
    } catch {
      alert('Netzwerkfehler')
    } finally {
      setSaving(false)
    }
  }

  const handleDelete = async (controlId: string) => {
    if (!confirm(`Control ${controlId} wirklich loeschen?`)) return
    try {
      const res = await fetch(`${BACKEND_URL}?id=${controlId}`, { method: 'DELETE' })
      if (!res.ok && res.status !== 204) {
        alert('Fehler beim Loeschen')
        return
      }
      await loadData()
      setSelectedControl(null)
      setMode('list')
    } catch {
      alert('Netzwerkfehler')
    }
  }

  // Generator handlers
  const handleGenerate = async () => {
    setGenerating(true)
    setGenResult(null)
    try {
      const res = await fetch(`${BACKEND_URL}?endpoint=generate`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          domain: genDomain || null,
          max_controls: genMaxControls,
          dry_run: genDryRun,
          skip_web_search: false,
        }),
      })
      if (!res.ok) {
        const err = await res.json()
        setGenResult({ status: 'error', message: err.error || err.details || 'Fehler' })
        return
      }
      const data = await res.json()
      setGenResult(data)
      if (!genDryRun) {
        await loadData()
      }
    } catch {
      setGenResult({ status: 'error', message: 'Netzwerkfehler' })
    } finally {
      setGenerating(false)
    }
  }

  const loadProcessedStats = async () => {
    try {
      const res = await fetch(`${BACKEND_URL}?endpoint=processed-stats`)
      if (res.ok) {
        const data = await res.json()
        setProcessedStats(data.stats || [])
      }
    } catch { /* ignore */ }
  }

  const handleReview = async (controlId: string, action: string) => {
    try {
      const res = await fetch(`${BACKEND_URL}?endpoint=review&id=${controlId}`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ action }),
      })
      if (res.ok) {
        await loadData()
        setSelectedControl(null)
        setMode('list')
      }
    } catch { /* ignore */ }
  }

  if (loading) {
    return (
      <div className="flex items-center justify-center h-96">
        <div className="animate-spin rounded-full h-8 w-8 border-2 border-purple-600 border-t-transparent" />
      </div>
    )
  }

  if (error) {
    return (
      <div className="p-6">
        <div className="bg-red-50 border border-red-200 rounded-lg p-4 text-red-800 text-sm">{error}</div>
      </div>
    )
  }

  // =========================================================================
  // CREATE MODE
  // =========================================================================
  if (mode === 'create') {
    return <ControlForm initial={EMPTY_CONTROL} onSave={handleCreate} onCancel={() => setMode('list')} saving={saving} />
  }

  // =========================================================================
  // EDIT MODE
  // =========================================================================
  if (mode === 'edit' && selectedControl) {
    const editData = {
      framework_id: frameworks[0]?.framework_id || 'bp_security_v1',
      control_id: selectedControl.control_id,
      title: selectedControl.title,
      objective: selectedControl.objective,
      rationale: selectedControl.rationale,
      scope: selectedControl.scope || { platforms: [], components: [], data_classes: [] },
      requirements: selectedControl.requirements.length ? selectedControl.requirements : [''],
      test_procedure: selectedControl.test_procedure.length ? selectedControl.test_procedure : [''],
      evidence: selectedControl.evidence.length ? selectedControl.evidence : [{ type: '', description: '' }],
      severity: selectedControl.severity,
      risk_score: selectedControl.risk_score,
      implementation_effort: selectedControl.implementation_effort,
      open_anchors: selectedControl.open_anchors.length ? selectedControl.open_anchors : [{ framework: '', ref: '', url: '' }],
      release_state: selectedControl.release_state,
      tags: selectedControl.tags,
    }
    return <ControlForm initial={editData} onSave={handleUpdate} onCancel={() => { setMode('detail') }} saving={saving} />
  }

  // =========================================================================
  // DETAIL VIEW
  // =========================================================================

  if (mode === 'detail' && selectedControl) {
    const ctrl = selectedControl
    return (
      <div className="max-w-4xl mx-auto p-6">
        <div className="flex items-center justify-between mb-6">
          <button onClick={() => { setSelectedControl(null); setMode('list') }} className="flex items-center gap-1 text-sm text-gray-500 hover:text-gray-700">
            <ArrowLeft className="w-4 h-4" /> Zurueck zur Uebersicht
          </button>
          <div className="flex items-center gap-2">
            <button onClick={() => setMode('edit')} className="flex items-center gap-1 px-3 py-1.5 text-sm text-purple-600 border border-purple-300 rounded-lg hover:bg-purple-50">
              <Pencil className="w-3.5 h-3.5" /> Bearbeiten
            </button>
            <button onClick={() => handleDelete(ctrl.control_id)} className="flex items-center gap-1 px-3 py-1.5 text-sm text-red-600 border border-red-300 rounded-lg hover:bg-red-50">
              <Trash2 className="w-3.5 h-3.5" /> Loeschen
            </button>
          </div>
        </div>

        {/* Header */}
        <div className="flex items-start gap-4 mb-6">
          <div className="flex-shrink-0 w-12 h-12 bg-purple-100 rounded-lg flex items-center justify-center">
            <Shield className="w-6 h-6 text-purple-600" />
          </div>
          <div className="flex-1">
            <div className="flex items-center gap-2 mb-1">
              <span className="text-sm font-mono text-purple-600">{ctrl.control_id}</span>
              <SeverityBadge severity={ctrl.severity} />
              <StateBadge state={ctrl.release_state} />
            </div>
            <h1 className="text-xl font-bold text-gray-900">{ctrl.title}</h1>
            <div className="flex items-center gap-4 mt-2 text-xs text-gray-500">
              {ctrl.risk_score !== null && <span>Risiko-Score: {ctrl.risk_score}/10</span>}
              {ctrl.implementation_effort && <span>Aufwand: {EFFORT_LABELS[ctrl.implementation_effort] || ctrl.implementation_effort}</span>}
            </div>
          </div>
        </div>

        {/* Objective & Rationale */}
        <div className="space-y-6">
          <section>
            <h3 className="text-sm font-semibold text-gray-900 mb-2">Ziel</h3>
            <p className="text-sm text-gray-700 bg-gray-50 rounded-lg p-4">{ctrl.objective}</p>
          </section>

          <section>
            <h3 className="text-sm font-semibold text-gray-900 mb-2">Begruendung</h3>
            <p className="text-sm text-gray-700 bg-gray-50 rounded-lg p-4">{ctrl.rationale}</p>
          </section>

          {/* Scope */}
          <section>
            <h3 className="text-sm font-semibold text-gray-900 mb-2">Geltungsbereich</h3>
            <div className="grid grid-cols-3 gap-4">
              {ctrl.scope.platforms && ctrl.scope.platforms.length > 0 && (
                <div>
                  <p className="text-xs font-medium text-gray-500 mb-1">Plattformen</p>
                  <div className="flex flex-wrap gap-1">
                    {ctrl.scope.platforms.map(p => (
                      <span key={p} className="px-2 py-0.5 bg-blue-50 text-blue-700 rounded text-xs">{p}</span>
                    ))}
                  </div>
                </div>
              )}
              {ctrl.scope.components && ctrl.scope.components.length > 0 && (
                <div>
                  <p className="text-xs font-medium text-gray-500 mb-1">Komponenten</p>
                  <div className="flex flex-wrap gap-1">
                    {ctrl.scope.components.map(c => (
                      <span key={c} className="px-2 py-0.5 bg-purple-50 text-purple-700 rounded text-xs">{c}</span>
                    ))}
                  </div>
                </div>
              )}
              {ctrl.scope.data_classes && ctrl.scope.data_classes.length > 0 && (
                <div>
                  <p className="text-xs font-medium text-gray-500 mb-1">Datenklassen</p>
                  <div className="flex flex-wrap gap-1">
                    {ctrl.scope.data_classes.map(d => (
                      <span key={d} className="px-2 py-0.5 bg-amber-50 text-amber-700 rounded text-xs">{d}</span>
                    ))}
                  </div>
                </div>
              )}
            </div>
          </section>

          {/* Requirements */}
          <section>
            <h3 className="text-sm font-semibold text-gray-900 mb-2">Anforderungen</h3>
            <ol className="space-y-2">
              {ctrl.requirements.map((req, i) => (
                <li key={i} className="flex items-start gap-2 text-sm text-gray-700">
                  <span className="flex-shrink-0 w-5 h-5 bg-purple-100 text-purple-700 rounded-full flex items-center justify-center text-xs font-medium mt-0.5">{i + 1}</span>
                  {req}
                </li>
              ))}
            </ol>
          </section>

          {/* Test Procedure */}
          <section>
            <h3 className="text-sm font-semibold text-gray-900 mb-2">Pruefverfahren</h3>
            <ol className="space-y-2">
              {ctrl.test_procedure.map((step, i) => (
                <li key={i} className="flex items-start gap-2 text-sm text-gray-700">
                  <CheckCircle2 className="w-4 h-4 text-green-500 flex-shrink-0 mt-0.5" />
                  {step}
                </li>
              ))}
            </ol>
          </section>

          {/* Evidence */}
          <section>
            <h3 className="text-sm font-semibold text-gray-900 mb-2">Nachweisanforderungen</h3>
            <div className="space-y-2">
              {ctrl.evidence.map((ev, i) => (
                <div key={i} className="flex items-start gap-2 p-3 bg-gray-50 rounded-lg">
                  <FileText className="w-4 h-4 text-gray-400 flex-shrink-0 mt-0.5" />
                  <div>
                    <span className="text-xs font-medium text-gray-500 uppercase">{ev.type}</span>
                    <p className="text-sm text-gray-700">{ev.description}</p>
                  </div>
                </div>
              ))}
            </div>
          </section>

          {/* Open Anchors — THE KEY SECTION */}
          <section className="bg-green-50 border border-green-200 rounded-lg p-4">
            <div className="flex items-center gap-2 mb-3">
              <BookOpen className="w-4 h-4 text-green-700" />
              <h3 className="text-sm font-semibold text-green-900">Open-Source-Referenzen</h3>
              <span className="text-xs text-green-600">({ctrl.open_anchors.length} Quellen)</span>
            </div>
            <p className="text-xs text-green-700 mb-3">
              Dieses Control basiert auf frei verfuegbarem Wissen. Alle Referenzen sind offen und oeffentlich zugaenglich.
            </p>
            <div className="space-y-2">
              {ctrl.open_anchors.map((anchor, i) => (
                <div key={i} className="flex items-start gap-3 p-2 bg-white rounded border border-green-100">
                  <Scale className="w-4 h-4 text-green-600 flex-shrink-0 mt-0.5" />
                  <div className="flex-1 min-w-0">
                    <span className="text-xs font-semibold text-green-800">{anchor.framework}</span>
                    <p className="text-sm text-gray-700">{anchor.ref}</p>
                  </div>
                  <a
                    href={anchor.url}
                    target="_blank"
                    rel="noopener noreferrer"
                    className="flex items-center gap-1 text-xs text-green-600 hover:text-green-800 flex-shrink-0"
                  >
                    <ExternalLink className="w-3 h-3" />
                    Quelle
                  </a>
                </div>
              ))}
            </div>
          </section>

          {/* Tags */}
          {ctrl.tags.length > 0 && (
            <section>
              <h3 className="text-sm font-semibold text-gray-900 mb-2">Tags</h3>
              <div className="flex flex-wrap gap-1.5">
                {ctrl.tags.map(tag => (
                  <span key={tag} className="px-2 py-1 bg-gray-100 text-gray-600 rounded text-xs">{tag}</span>
                ))}
              </div>
            </section>
          )}

          {/* License & Citation Info */}
          {ctrl.license_rule && (
            <section className="bg-blue-50 border border-blue-200 rounded-lg p-4">
              <div className="flex items-center gap-2 mb-2">
                <Scale className="w-4 h-4 text-blue-700" />
                <h3 className="text-sm font-semibold text-blue-900">Lizenzinformationen</h3>
                <LicenseRuleBadge rule={ctrl.license_rule} />
              </div>
              {ctrl.source_citation && (
                <div className="text-xs text-blue-800 space-y-1">
                  <p><span className="font-medium">Quelle:</span> {ctrl.source_citation.source}</p>
                  {ctrl.source_citation.license && <p><span className="font-medium">Lizenz:</span> {ctrl.source_citation.license}</p>}
                  {ctrl.source_citation.license_notice && <p><span className="font-medium">Hinweis:</span> {ctrl.source_citation.license_notice}</p>}
                  {ctrl.source_citation.url && (
                    <a href={ctrl.source_citation.url} target="_blank" rel="noopener noreferrer" className="flex items-center gap-1 text-blue-600 hover:text-blue-800">
                      <ExternalLink className="w-3 h-3" /> Originalquelle
                    </a>
                  )}
                </div>
              )}
              {ctrl.source_original_text && (
                <details className="mt-2">
                  <summary className="text-xs text-blue-600 cursor-pointer hover:text-blue-800">Originaltext anzeigen</summary>
                  <p className="mt-1 text-xs text-gray-700 bg-white rounded p-2 border border-blue-100 max-h-40 overflow-y-auto">{ctrl.source_original_text}</p>
                </details>
              )}
              {ctrl.license_rule === 3 && (
                <p className="text-xs text-amber-700 mt-2 flex items-center gap-1">
                  <Lock className="w-3 h-3" />
                  Eigenstaendig formuliert — keine Originalquelle gespeichert
                </p>
              )}
            </section>
          )}

          {/* Generation Metadata (internal) */}
          {ctrl.generation_metadata && (
            <section className="bg-gray-50 border border-gray-200 rounded-lg p-4">
              <div className="flex items-center gap-2 mb-2">
                <Clock className="w-4 h-4 text-gray-500" />
                <h3 className="text-sm font-semibold text-gray-700">Generierungsdetails (intern)</h3>
              </div>
              <div className="text-xs text-gray-600 space-y-1">
                <p>Pfad: {String(ctrl.generation_metadata.processing_path || '-')}</p>
                {ctrl.generation_metadata.similarity_status && (
                  <p className="text-red-600">Similarity: {String(ctrl.generation_metadata.similarity_status)}</p>
                )}
                {Array.isArray(ctrl.generation_metadata.similar_controls) && (
                  <div>
                    <p className="font-medium">Aehnliche Controls:</p>
                    {(ctrl.generation_metadata.similar_controls as Array<Record<string, unknown>>).map((s, i) => (
                      <p key={i} className="ml-2">{String(s.control_id)} — {String(s.title)} ({String(s.similarity)})</p>
                    ))}
                  </div>
                )}
              </div>
            </section>
          )}

          {/* Review Actions */}
          {['needs_review', 'too_close', 'duplicate'].includes(ctrl.release_state) && (
            <section className="bg-yellow-50 border border-yellow-200 rounded-lg p-4">
              <div className="flex items-center gap-2 mb-3">
                <Eye className="w-4 h-4 text-yellow-700" />
                <h3 className="text-sm font-semibold text-yellow-900">Review erforderlich</h3>
              </div>
              <div className="flex items-center gap-2">
                <button
                  onClick={() => handleReview(ctrl.control_id, 'approve')}
                  className="px-3 py-1.5 text-sm text-white bg-green-600 rounded-lg hover:bg-green-700"
                >
                  <CheckCircle2 className="w-3.5 h-3.5 inline mr-1" />
                  Akzeptieren
                </button>
                <button
                  onClick={() => handleReview(ctrl.control_id, 'reject')}
                  className="px-3 py-1.5 text-sm text-white bg-red-600 rounded-lg hover:bg-red-700"
                >
                  <Trash2 className="w-3.5 h-3.5 inline mr-1" />
                  Ablehnen
                </button>
                <button
                  onClick={() => setMode('edit')}
                  className="px-3 py-1.5 text-sm text-gray-600 border border-gray-300 rounded-lg hover:bg-gray-50"
                >
                  <Pencil className="w-3.5 h-3.5 inline mr-1" />
                  Ueberarbeiten
                </button>
              </div>
            </section>
          )}
        </div>
      </div>
    )
  }

  // =========================================================================
  // LIST VIEW
  // =========================================================================

  return (
    <div className="flex flex-col h-full">
      {/* Header */}
      <div className="border-b border-gray-200 bg-white px-6 py-4">
        <div className="flex items-center justify-between mb-4">
          <div className="flex items-center gap-3">
            <Shield className="w-6 h-6 text-purple-600" />
            <div>
              <h1 className="text-lg font-semibold text-gray-900">Canonical Control Library</h1>
              <p className="text-xs text-gray-500">
                {controls.length} unabhaengig formulierte Security Controls —{' '}
                {controls.reduce((sum, c) => sum + c.open_anchors.length, 0)} Open-Source-Referenzen
              </p>
            </div>
          </div>
          <div className="flex items-center gap-2">
            <button
              onClick={() => { setShowStats(!showStats); if (!showStats) loadProcessedStats() }}
              className="flex items-center gap-1.5 px-3 py-2 text-sm text-gray-600 border border-gray-300 rounded-lg hover:bg-gray-50"
            >
              <BarChart3 className="w-4 h-4" />
              Stats
            </button>
            <button
              onClick={() => setShowGenerator(true)}
              className="flex items-center gap-1.5 px-3 py-2 text-sm text-white bg-amber-600 rounded-lg hover:bg-amber-700"
            >
              <Zap className="w-4 h-4" />
              Generator
            </button>
            <button
              onClick={() => setMode('create')}
              className="flex items-center gap-1.5 px-3 py-2 text-sm text-white bg-purple-600 rounded-lg hover:bg-purple-700"
            >
              <Plus className="w-4 h-4" />
              Neues Control
            </button>
          </div>
        </div>

        {/* Frameworks */}
        {frameworks.length > 0 && (
          <div className="mb-4 p-3 bg-purple-50 rounded-lg">
            <div className="flex items-center gap-2 text-xs text-purple-700">
              <Lock className="w-3 h-3" />
              <span className="font-medium">{frameworks[0]?.name} v{frameworks[0]?.version}</span>
              <span className="text-purple-500">—</span>
              <span>{frameworks[0]?.description}</span>
            </div>
          </div>
        )}

        {/* Filters */}
        <div className="flex items-center gap-3">
          <div className="relative flex-1">
            <Search className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-gray-400" />
            <input
              type="text"
              placeholder="Controls durchsuchen..."
              value={searchQuery}
              onChange={e => setSearchQuery(e.target.value)}
              className="w-full pl-9 pr-4 py-2 text-sm border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-purple-500"
            />
          </div>
          <div className="flex items-center gap-1">
            <Filter className="w-4 h-4 text-gray-400" />
          </div>
          <select
            value={severityFilter}
            onChange={e => setSeverityFilter(e.target.value)}
            className="text-sm border border-gray-300 rounded-lg px-3 py-2 focus:outline-none focus:ring-2 focus:ring-purple-500"
          >
            <option value="">Alle Schweregrade</option>
            <option value="critical">Kritisch</option>
            <option value="high">Hoch</option>
            <option value="medium">Mittel</option>
            <option value="low">Niedrig</option>
          </select>
          <select
            value={domainFilter}
            onChange={e => setDomainFilter(e.target.value)}
            className="text-sm border border-gray-300 rounded-lg px-3 py-2 focus:outline-none focus:ring-2 focus:ring-purple-500"
          >
            <option value="">Alle Domains</option>
            {domains.map(d => (
              <option key={d} value={d}>{d}</option>
            ))}
          </select>
          <select
            value={stateFilter}
            onChange={e => setStateFilter(e.target.value)}
            className="text-sm border border-gray-300 rounded-lg px-3 py-2 focus:outline-none focus:ring-2 focus:ring-purple-500"
          >
            <option value="">Alle Status</option>
            <option value="draft">Draft</option>
            <option value="approved">Approved</option>
            <option value="needs_review">Review noetig</option>
            <option value="too_close">Zu aehnlich</option>
            <option value="duplicate">Duplikat</option>
          </select>
        </div>

        {/* Processing Stats */}
        {showStats && processedStats.length > 0 && (
          <div className="mt-3 p-3 bg-gray-50 rounded-lg">
            <h4 className="text-xs font-semibold text-gray-700 mb-2">Verarbeitungsfortschritt</h4>
            <div className="grid grid-cols-3 gap-3">
              {processedStats.map((s, i) => (
                <div key={i} className="text-xs">
                  <span className="font-medium text-gray-700">{String(s.collection)}</span>
                  <div className="flex gap-2 mt-1 text-gray-500">
                    <span>{String(s.processed_chunks)} verarbeitet</span>
                    <span>{String(s.direct_adopted)} direkt</span>
                    <span>{String(s.llm_reformed)} reformuliert</span>
                  </div>
                </div>
              ))}
            </div>
          </div>
        )}
      </div>

      {/* Generator Modal */}
      {showGenerator && (
        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/40">
          <div className="bg-white rounded-xl shadow-xl w-full max-w-lg p-6 mx-4">
            <div className="flex items-center justify-between mb-4">
              <div className="flex items-center gap-2">
                <Zap className="w-5 h-5 text-amber-600" />
                <h2 className="text-lg font-semibold text-gray-900">Control Generator</h2>
              </div>
              <button onClick={() => { setShowGenerator(false); setGenResult(null) }} className="text-gray-400 hover:text-gray-600">
                <X className="w-5 h-5" />
              </button>
            </div>

            <div className="space-y-4">
              <div>
                <label className="block text-xs font-medium text-gray-600 mb-1">Domain (optional)</label>
                <select value={genDomain} onChange={e => setGenDomain(e.target.value)} className="w-full px-3 py-2 text-sm border border-gray-300 rounded-lg">
                  <option value="">Alle Domains</option>
                  <option value="AUTH">AUTH — Authentifizierung</option>
                  <option value="CRYPT">CRYPT — Kryptographie</option>
                  <option value="NET">NET — Netzwerk</option>
                  <option value="DATA">DATA — Datenschutz</option>
                  <option value="LOG">LOG — Logging</option>
                  <option value="ACC">ACC — Zugriffskontrolle</option>
                  <option value="SEC">SEC — Sicherheit</option>
                  <option value="INC">INC — Incident Response</option>
                  <option value="AI">AI — Kuenstliche Intelligenz</option>
                  <option value="COMP">COMP — Compliance</option>
                </select>
              </div>

              <div>
                <label className="block text-xs font-medium text-gray-600 mb-1">Max. Controls: {genMaxControls}</label>
                <input
                  type="range" min="1" max="100" step="1"
                  value={genMaxControls}
                  onChange={e => setGenMaxControls(parseInt(e.target.value))}
                  className="w-full"
                />
              </div>

              <div className="flex items-center gap-2">
                <input
                  type="checkbox"
                  id="dryRun"
                  checked={genDryRun}
                  onChange={e => setGenDryRun(e.target.checked)}
                  className="rounded border-gray-300"
                />
                <label htmlFor="dryRun" className="text-sm text-gray-700">Dry Run (Vorschau ohne Speicherung)</label>
              </div>

              <button
                onClick={handleGenerate}
                disabled={generating}
                className="w-full py-2 text-sm text-white bg-amber-600 rounded-lg hover:bg-amber-700 disabled:opacity-50 flex items-center justify-center gap-2"
              >
                {generating ? (
                  <><RefreshCw className="w-4 h-4 animate-spin" /> Generiere...</>
                ) : (
                  <><Zap className="w-4 h-4" /> Generierung starten</>
                )}
              </button>

              {/* Results */}
              {genResult && (
                <div className={`p-4 rounded-lg text-sm ${genResult.status === 'error' ? 'bg-red-50 text-red-800' : 'bg-green-50 text-green-800'}`}>
                  <p className="font-medium mb-1">{String(genResult.message || genResult.status)}</p>
                  {genResult.status !== 'error' && (
                    <div className="grid grid-cols-2 gap-1 text-xs mt-2">
                      <span>Chunks gescannt: {String(genResult.total_chunks_scanned)}</span>
                      <span>Controls generiert: {String(genResult.controls_generated)}</span>
                      <span>Verifiziert: {String(genResult.controls_verified)}</span>
                      <span>Review noetig: {String(genResult.controls_needs_review)}</span>
                      <span>Zu aehnlich: {String(genResult.controls_too_close)}</span>
                      <span>Duplikate: {String(genResult.controls_duplicates_found)}</span>
                    </div>
                  )}
                  {Array.isArray(genResult.errors) && (genResult.errors as string[]).length > 0 && (
                    <div className="mt-2 text-xs text-red-600">
                      {(genResult.errors as string[]).slice(0, 3).map((e, i) => <p key={i}>{e}</p>)}
                    </div>
                  )}
                </div>
              )}
            </div>
          </div>
        </div>
      )}

      {/* Control List */}
      <div className="flex-1 overflow-y-auto p-6">
        <div className="space-y-3">
          {filteredControls.map(ctrl => (
            <button
              key={ctrl.control_id}
              onClick={() => { setSelectedControl(ctrl); setMode('detail') }}
              className="w-full text-left bg-white border border-gray-200 rounded-lg p-4 hover:border-purple-300 hover:shadow-sm transition-all group"
            >
              <div className="flex items-start justify-between">
                <div className="flex-1 min-w-0">
                  <div className="flex items-center gap-2 mb-1">
                    <span className="text-xs font-mono text-purple-600 bg-purple-50 px-1.5 py-0.5 rounded">{ctrl.control_id}</span>
                    <SeverityBadge severity={ctrl.severity} />
                    <StateBadge state={ctrl.release_state} />
                    <LicenseRuleBadge rule={ctrl.license_rule} />
                    {ctrl.risk_score !== null && (
                      <span className="text-xs text-gray-400">Score: {ctrl.risk_score}</span>
                    )}
                  </div>
                  <h3 className="text-sm font-medium text-gray-900 group-hover:text-purple-700">{ctrl.title}</h3>
                  <p className="text-xs text-gray-500 mt-1 line-clamp-2">{ctrl.objective}</p>

                  {/* Open anchors summary */}
                  <div className="flex items-center gap-2 mt-2">
                    <BookOpen className="w-3 h-3 text-green-600" />
                    <span className="text-xs text-green-700">
                      {ctrl.open_anchors.length} Open-Source-Referenzen:
                    </span>
                    <span className="text-xs text-gray-500">
                      {ctrl.open_anchors.map(a => a.framework).filter((v, i, arr) => arr.indexOf(v) === i).join(', ')}
                    </span>
                  </div>
                </div>
                <ChevronRight className="w-4 h-4 text-gray-300 group-hover:text-purple-500 flex-shrink-0 mt-1 ml-4" />
              </div>
            </button>
          ))}

          {filteredControls.length === 0 && (
            <div className="text-center py-12 text-gray-400 text-sm">
              {controls.length === 0
                ? 'Noch keine Controls vorhanden. Klicke auf "Neues Control" um zu starten.'
                : 'Keine Controls gefunden.'}
            </div>
          )}
        </div>
      </div>
    </div>
  )
}