'use client'

/**
 * Screen Flow Visualization - Compliance SDK
 *
 * Visualisiert alle Screens aus:
 * - Admin Compliance (Port 3007): Verwaltung
 * - SDK Pipeline: Compliance-Module
 */

import { useCallback, useState, useMemo, useEffect } from 'react'
import ReactFlow, {
  Node,
  Edge,
  Controls,
  Background,
  MiniMap,
  useNodesState,
  useEdgesState,
  BackgroundVariant,
  MarkerType,
  Panel,
} from 'reactflow'
import 'reactflow/dist/style.css'

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

interface ScreenDefinition {
  id: string
  name: string
  description: string
  category: string
  icon: string
  url?: string
}

interface ConnectionDef {
  source: string
  target: string
  label?: string
}

// ============================================
// ADMIN COMPLIANCE SCREENS (Port 3007)
// ============================================

const SCREENS: ScreenDefinition[] = [
  // === DASHBOARD & VERWALTUNG (Blue) ===
  { id: 'dashboard', name: 'Dashboard', description: 'Uebersicht & Statistiken', category: 'dashboard', icon: '🏠', url: '/dashboard' },
  { id: 'catalog-manager', name: 'Katalogverwaltung', description: 'SDK-Kataloge & Auswahltabellen', category: 'dashboard', icon: '📦', url: '/dashboard/catalog-manager' },

  // === DSGVO-GRUNDLAGEN (Violet) ===
  { id: 'vvt', name: 'VVT', description: 'Verarbeitungsverzeichnis Art. 30', category: 'dsgvo', icon: '📋', url: '/sdk/vvt' },
  { id: 'dsfa', name: 'DSFA', description: 'Datenschutz-Folgenabschaetzung', category: 'dsgvo', icon: '⚖️', url: '/sdk/dsfa' },
  { id: 'tom', name: 'TOMs', description: 'Technische & Org. Massnahmen', category: 'dsgvo', icon: '🛡️', url: '/sdk/tom' },
  { id: 'tom-generator', name: 'TOM Generator', description: 'TOM-Erstellung mit Wizard', category: 'dsgvo', icon: '⚙️', url: '/sdk/tom-generator' },
  { id: 'loeschfristen', name: 'Loeschfristen', description: 'Aufbewahrung & Deadlines', category: 'dsgvo', icon: '🗑️', url: '/sdk/loeschfristen' },
  { id: 'einwilligungen', name: 'Einwilligungen', description: 'Nutzer-Consent Uebersicht', category: 'dsgvo', icon: '✅', url: '/sdk/einwilligungen' },
  { id: 'dsr', name: 'Datenschutzanfragen', description: 'DSGVO Art. 15-21 (DSR)', category: 'dsgvo', icon: '🔒', url: '/sdk/dsr' },
  { id: 'consent', name: 'Consent Verwaltung', description: 'Rechtliche Dokumente & Versionen', category: 'dsgvo', icon: '📄', url: '/sdk/consent' },
  { id: 'consent-management', name: 'Consent Management', description: 'Einwilligungsmanagement', category: 'dsgvo', icon: '📝', url: '/sdk/consent-management' },

  // === COMPLIANCE-MANAGEMENT (Purple) ===
  { id: 'compliance-hub', name: 'Compliance Hub', description: 'Zentrales GRC Dashboard', category: 'compliance', icon: '✅', url: '/sdk/compliance-hub' },
  { id: 'compliance-scope', name: 'Compliance Scope', description: 'Geltungsbereich definieren', category: 'compliance', icon: '🎯', url: '/sdk/compliance-scope' },
  { id: 'requirements', name: 'Requirements', description: '558+ aus 19 Verordnungen', category: 'compliance', icon: '📜', url: '/sdk/requirements' },
  { id: 'controls', name: 'Controls', description: '474 Control-Mappings', category: 'compliance', icon: '🎛️', url: '/sdk/controls' },
  { id: 'evidence', name: 'Evidence', description: 'Nachweise & Dokumentation', category: 'compliance', icon: '📎', url: '/sdk/evidence' },
  { id: 'risks', name: 'Risiken', description: 'Risk Matrix & Register', category: 'compliance', icon: '⚠️', url: '/sdk/risks' },
  { id: 'audit-checklist', name: 'Audit Checkliste', description: '476 Anforderungen pruefen', category: 'compliance', icon: '📋', url: '/sdk/audit-checklist' },
  { id: 'audit-report', name: 'Audit Report', description: 'PDF Audit-Berichte', category: 'compliance', icon: '📊', url: '/sdk/audit-report' },
  { id: 'workflow', name: 'Workflow', description: 'Freigabe-Workflows', category: 'compliance', icon: '🔄', url: '/sdk/workflow' },
  { id: 'modules', name: 'Service Registry', description: '30+ Service-Module', category: 'compliance', icon: '🔧', url: '/sdk/modules' },

  // === KI & AUTOMATISIERUNG (Teal) ===
  { id: 'ai-act', name: 'EU-AI-Act', description: 'KI-Risikoklassifizierung', category: 'ai', icon: '🤖', url: '/sdk/ai-act' },
  { id: 'screening', name: 'Screening', description: 'Compliance-Screening & Pruefung', category: 'ai', icon: '🔍', url: '/sdk/screening' },
  { id: 'rag', name: 'Daten & RAG', description: 'Training Data & RAG', category: 'ai', icon: '🗄️', url: '/sdk/rag' },
  { id: 'quality', name: 'Qualitaet & Audit', description: 'Compliance-Audit & Traceability', category: 'ai', icon: '✨', url: '/sdk/quality' },
  { id: 'advisory-board', name: 'Advisory Board', description: 'KI-Use-Case Pruefung', category: 'ai', icon: '🧑‍⚖️', url: '/sdk/advisory-board' },
  { id: 'obligations', name: 'Pflichten', description: 'NIS2, DSGVO, AI Act', category: 'ai', icon: '⚡', url: '/sdk/obligations' },
  { id: 'escalations', name: 'Eskalations-Queue', description: 'DSB Review & Freigabe', category: 'ai', icon: '🚨', url: '/sdk/escalations' },

  // === DOKUMENTE & LEGAL (Orange) ===
  { id: 'document-generator', name: 'Document Generator', description: 'Datenschutz-Dokumente erstellen', category: 'documents', icon: '📄', url: '/sdk/document-generator' },
  { id: 'notfallplan', name: 'Notfallplan', description: 'Incident Response Plan', category: 'documents', icon: '🚨', url: '/sdk/notfallplan' },
  { id: 'source-policy', name: 'Quellen-Policy', description: 'Datenquellen & Compliance', category: 'documents', icon: '📚', url: '/sdk/source-policy' },
  { id: 'cookie-banner', name: 'Cookie-Banner', description: 'Cookie Consent Builder', category: 'documents', icon: '🍪', url: '/sdk/cookie-banner' },
  { id: 'company-profile', name: 'Unternehmensprofil', description: 'Firmen-Stammdaten', category: 'documents', icon: '🏢', url: '/sdk/company-profile' },
  { id: 'security-backlog', name: 'Security Backlog', description: 'Sicherheits-Massnahmen Tracking', category: 'documents', icon: '🔐', url: '/sdk/security-backlog' },

  // === VENDOR & EXTERN (Green) ===
  { id: 'vendor-compliance', name: 'Vendor Compliance', description: 'Lieferanten-Management', category: 'vendor', icon: '🏭', url: '/sdk/vendor-compliance' },
  { id: 'vendor-vendors', name: 'Vendor-Liste', description: 'Lieferanten-Uebersicht', category: 'vendor', icon: '📋', url: '/sdk/vendor-compliance/vendors' },
  { id: 'vendor-contracts', name: 'Vertraege', description: 'AVV & Vertragsmanagement', category: 'vendor', icon: '📝', url: '/sdk/vendor-compliance/contracts' },
  { id: 'vendor-controls', name: 'Vendor Controls', description: 'Lieferanten-Kontrollen', category: 'vendor', icon: '🎛️', url: '/sdk/vendor-compliance/controls' },
  { id: 'vendor-risks', name: 'Vendor Risiken', description: 'Lieferanten-Risikobewertung', category: 'vendor', icon: '⚠️', url: '/sdk/vendor-compliance/risks' },
  { id: 'vendor-processing', name: 'Verarbeitungen', description: 'Auftragsverarbeitung', category: 'vendor', icon: '🔄', url: '/sdk/vendor-compliance/processing-activities' },
  { id: 'vendor-reports', name: 'Vendor Reports', description: 'Lieferanten-Berichte', category: 'vendor', icon: '📊', url: '/sdk/vendor-compliance/reports' },
  { id: 'dsms', name: 'DSMS', description: 'Datenschutz-Management-System', category: 'vendor', icon: '🏛️', url: '/sdk/dsms' },
  { id: 'import', name: 'Import', description: 'Daten-Import', category: 'vendor', icon: '📥', url: '/sdk/import' },

  // === ENTWICKLUNG (Slate) ===
  { id: 'dev-docs', name: 'Developer Docs', description: 'API & Architektur', category: 'development', icon: '📖', url: '/development/docs' },
  { id: 'dev-screen-flow', name: 'Screen Flow', description: 'UI Screen-Verbindungen', category: 'development', icon: '🔀', url: '/development/screen-flow' },
  { id: 'dev-brandbook', name: 'Brandbook', description: 'Corporate Design', category: 'development', icon: '🎨', url: '/development/brandbook' },
]

const CONNECTIONS: ConnectionDef[] = [
  // === DASHBOARD FLOW ===
  { source: 'dashboard', target: 'catalog-manager', label: 'Kataloge' },
  { source: 'dashboard', target: 'compliance-hub', label: 'Compliance' },
  { source: 'dashboard', target: 'vvt', label: 'VVT' },

  // === DSGVO FLOW ===
  { source: 'consent-management', target: 'einwilligungen', label: 'Nutzer' },
  { source: 'consent-management', target: 'dsr' },
  { source: 'consent', target: 'consent-management' },
  { source: 'consent', target: 'cookie-banner' },
  { source: 'dsr', target: 'loeschfristen' },
  { source: 'vvt', target: 'tom' },
  { source: 'vvt', target: 'dsfa' },
  { source: 'dsfa', target: 'tom' },
  { source: 'tom', target: 'tom-generator', label: 'Wizard' },
  { source: 'einwilligungen', target: 'consent' },
  { source: 'einwilligungen', target: 'loeschfristen' },

  // === COMPLIANCE FLOW ===
  { source: 'compliance-hub', target: 'audit-checklist', label: 'Audit' },
  { source: 'compliance-hub', target: 'requirements', label: 'Anforderungen' },
  { source: 'compliance-hub', target: 'risks', label: 'Risiken' },
  { source: 'compliance-hub', target: 'ai-act', label: 'AI Act' },
  { source: 'compliance-hub', target: 'compliance-scope' },
  { source: 'requirements', target: 'controls' },
  { source: 'controls', target: 'evidence' },
  { source: 'audit-checklist', target: 'audit-report', label: 'Report' },
  { source: 'risks', target: 'controls' },
  { source: 'modules', target: 'controls' },
  { source: 'obligations', target: 'requirements' },
  { source: 'dsms', target: 'workflow' },
  { source: 'workflow', target: 'audit-report' },

  // === KI & AUTOMATISIERUNG FLOW ===
  { source: 'advisory-board', target: 'escalations', label: 'Eskalation' },
  { source: 'advisory-board', target: 'dsfa', label: 'Risiko' },
  { source: 'ai-act', target: 'screening' },
  { source: 'screening', target: 'advisory-board' },
  { source: 'source-policy', target: 'rag' },
  { source: 'rag', target: 'quality' },

  // === DOKUMENTE FLOW ===
  { source: 'document-generator', target: 'notfallplan' },
  { source: 'document-generator', target: 'audit-report' },
  { source: 'security-backlog', target: 'tom' },
  { source: 'company-profile', target: 'document-generator' },

  // === VENDOR FLOW ===
  { source: 'vendor-compliance', target: 'vendor-vendors' },
  { source: 'vendor-compliance', target: 'vendor-contracts' },
  { source: 'vendor-compliance', target: 'vendor-controls' },
  { source: 'vendor-compliance', target: 'vendor-risks' },
  { source: 'vendor-compliance', target: 'vendor-processing' },
  { source: 'vendor-compliance', target: 'vendor-reports' },
  { source: 'vendor-vendors', target: 'vendor-contracts' },
  { source: 'vendor-risks', target: 'risks' },
  { source: 'dsms', target: 'compliance-hub' },
  { source: 'import', target: 'catalog-manager' },

  // === ENTWICKLUNG FLOW ===
  { source: 'dev-brandbook', target: 'dev-screen-flow' },
  { source: 'dev-docs', target: 'dev-brandbook' },
]

// ============================================
// CATEGORY COLORS & LABELS
// ============================================

const COLORS: Record<string, { bg: string; border: string; text: string }> = {
  dashboard: { bg: '#dbeafe', border: '#3b82f6', text: '#1e40af' },
  dsgvo: { bg: '#ede9fe', border: '#7c3aed', text: '#5b21b6' },
  compliance: { bg: '#f3e8ff', border: '#9333ea', text: '#6b21a8' },
  ai: { bg: '#ccfbf1', border: '#14b8a6', text: '#0f766e' },
  documents: { bg: '#ffedd5', border: '#f97316', text: '#c2410c' },
  vendor: { bg: '#dcfce7', border: '#22c55e', text: '#166534' },
  development: { bg: '#f1f5f9', border: '#64748b', text: '#334155' },
}

const LABELS: Record<string, string> = {
  dashboard: 'Dashboard & Verwaltung',
  dsgvo: 'DSGVO-Grundlagen',
  compliance: 'Compliance-Management',
  ai: 'KI & Automatisierung',
  documents: 'Dokumente & Legal',
  vendor: 'Vendor & Extern',
  development: 'Entwicklung',
}

// ============================================
// HELPER: Find all connected nodes
// ============================================

function findConnectedNodes(
  startNodeId: string,
  connections: ConnectionDef[],
  direction: 'children' | 'parents' | 'both' = 'children'
): Set<string> {
  const connected = new Set<string>()
  connected.add(startNodeId)

  const queue = [startNodeId]
  while (queue.length > 0) {
    const current = queue.shift()!

    connections.forEach(conn => {
      if ((direction === 'children' || direction === 'both') && conn.source === current) {
        if (!connected.has(conn.target)) {
          connected.add(conn.target)
          queue.push(conn.target)
        }
      }
      if ((direction === 'parents' || direction === 'both') && conn.target === current) {
        if (!connected.has(conn.source)) {
          connected.add(conn.source)
          queue.push(conn.source)
        }
      }
    })
  }

  return connected
}

// ============================================
// LAYOUT HELPERS
// ============================================

const CATEGORY_POSITIONS: Record<string, { x: number; y: number }> = {
  dashboard: { x: 400, y: 30 },
  dsgvo: { x: 50, y: 150 },
  compliance: { x: 700, y: 150 },
  ai: { x: 50, y: 380 },
  documents: { x: 400, y: 380 },
  vendor: { x: 700, y: 380 },
  development: { x: 400, y: 580 },
}

const getNodePosition = (id: string, category: string) => {
  const base = CATEGORY_POSITIONS[category] || { x: 400, y: 300 }
  const categoryScreens = SCREENS.filter(s => s.category === category)
  const categoryIndex = categoryScreens.findIndex(s => s.id === id)

  const cols = Math.ceil(Math.sqrt(categoryScreens.length + 1))
  const row = Math.floor(categoryIndex / cols)
  const col = categoryIndex % cols

  return {
    x: base.x + col * 160,
    y: base.y + row * 90,
  }
}

// ============================================
// MAIN COMPONENT
// ============================================

export default function ScreenFlowPage() {
  const [selectedCategory, setSelectedCategory] = useState<string | null>(null)
  const [selectedNode, setSelectedNode] = useState<string | null>(null)
  const [previewScreen, setPreviewScreen] = useState<ScreenDefinition | null>(null)

  const baseUrl = 'https://macmini:3007'

  // Calculate connected nodes
  const connectedNodes = useMemo(() => {
    if (!selectedNode) return new Set<string>()
    return findConnectedNodes(selectedNode, CONNECTIONS, 'children')
  }, [selectedNode])

  // Create nodes with useMemo
  const initialNodes = useMemo((): Node[] => {
    return SCREENS.map((screen) => {
      const catColors = COLORS[screen.category] || { bg: '#f1f5f9', border: '#94a3b8', text: '#475569' }
      const position = getNodePosition(screen.id, screen.category)

      let opacity = 1
      if (selectedNode) {
        opacity = connectedNodes.has(screen.id) ? 1 : 0.2
      } else if (selectedCategory) {
        opacity = screen.category === selectedCategory ? 1 : 0.2
      }

      const isSelected = selectedNode === screen.id

      return {
        id: screen.id,
        type: 'default',
        position,
        data: {
          label: (
            <div className="text-center p-1">
              <div className="text-lg mb-1">{screen.icon}</div>
              <div className="font-medium text-xs leading-tight">{screen.name}</div>
            </div>
          ),
        },
        style: {
          background: isSelected ? catColors.border : catColors.bg,
          color: isSelected ? 'white' : catColors.text,
          border: `2px solid ${catColors.border}`,
          borderRadius: '12px',
          padding: '6px',
          minWidth: '110px',
          opacity,
          cursor: 'pointer',
          boxShadow: isSelected ? `0 0 20px ${catColors.border}` : 'none',
        },
      }
    })
  }, [selectedCategory, selectedNode, connectedNodes])

  // Create edges with useMemo
  const initialEdges = useMemo((): Edge[] => {
    return CONNECTIONS.map((conn, index) => {
      const isHighlighted = selectedNode && (conn.source === selectedNode || conn.target === selectedNode)
      const isInSubtree = selectedNode && connectedNodes.has(conn.source) && connectedNodes.has(conn.target)

      return {
        id: `e-${conn.source}-${conn.target}-${index}`,
        source: conn.source,
        target: conn.target,
        label: conn.label,
        type: 'smoothstep',
        animated: isHighlighted || false,
        style: {
          stroke: isHighlighted ? '#3b82f6' : (isInSubtree ? '#94a3b8' : '#e2e8f0'),
          strokeWidth: isHighlighted ? 3 : 1.5,
          opacity: selectedNode ? (isInSubtree ? 1 : 0.15) : 1,
        },
        labelStyle: { fontSize: 9, fill: '#64748b' },
        labelBgStyle: { fill: '#f8fafc' },
        markerEnd: { type: MarkerType.ArrowClosed, color: isHighlighted ? '#3b82f6' : '#94a3b8', width: 15, height: 15 },
      }
    })
  }, [selectedNode, connectedNodes])

  const [nodes, setNodes, onNodesChange] = useNodesState([])
  const [edges, setEdges, onEdgesChange] = useEdgesState([])

  // Update nodes/edges when dependencies change
  useEffect(() => {
    setNodes(initialNodes)
    setEdges(initialEdges)
  }, [initialNodes, initialEdges, setNodes, setEdges])

  // Handle node click
  const onNodeClick = useCallback((_event: React.MouseEvent, node: Node) => {
    const screen = SCREENS.find(s => s.id === node.id)

    if (selectedNode === node.id) {
      if (screen?.url) {
        window.open(`${baseUrl}${screen.url}`, '_blank')
      }
      return
    }

    setSelectedNode(node.id)
    setSelectedCategory(null)

    if (screen) {
      setPreviewScreen(screen)
    }
  }, [selectedNode, baseUrl])

  // Handle background click - deselect
  const onPaneClick = useCallback(() => {
    setSelectedNode(null)
    setPreviewScreen(null)
  }, [])

  // Stats
  const stats = {
    totalScreens: SCREENS.length,
    totalConnections: CONNECTIONS.length,
    connectedCount: connectedNodes.size,
  }

  const categories = Object.keys(LABELS)

  // Connected screens list
  const connectedScreens = selectedNode
    ? SCREENS.filter(s => connectedNodes.has(s.id))
    : []

  return (
    <div className="space-y-6">
      {/* Header */}
      <div className="bg-white rounded-xl border border-slate-200 p-6 shadow-sm">
        <div className="flex items-center gap-4">
          <div className="w-14 h-14 rounded-xl bg-violet-500 flex items-center justify-center text-2xl text-white">
            🔀
          </div>
          <div>
            <h2 className="text-xl font-bold text-slate-900">Compliance SDK Screen Flow</h2>
            <p className="text-sm text-slate-500">
              {stats.totalScreens} Screens mit {stats.totalConnections} Verbindungen
            </p>
          </div>
        </div>
      </div>

      {/* Stats */}
      <div className="grid grid-cols-4 gap-4">
        <div className="bg-white rounded-xl border border-slate-200 p-4 shadow-sm">
          <div className="text-3xl font-bold text-slate-800">{stats.totalScreens}</div>
          <div className="text-sm text-slate-500">Screens</div>
        </div>
        <div className="bg-white rounded-xl border border-slate-200 p-4 shadow-sm">
          <div className="text-3xl font-bold text-violet-600">{stats.totalConnections}</div>
          <div className="text-sm text-slate-500">Verbindungen</div>
        </div>
        <div className="bg-white rounded-xl border border-slate-200 p-4 shadow-sm col-span-2">
          {selectedNode ? (
            <div className="flex items-center gap-3">
              <div className="text-3xl">{previewScreen?.icon}</div>
              <div>
                <div className="font-bold text-slate-800">{previewScreen?.name}</div>
                <div className="text-sm text-slate-500">
                  {stats.connectedCount} verbundene Screen{stats.connectedCount !== 1 ? 's' : ''}
                </div>
              </div>
              <button
                onClick={() => {
                  setSelectedNode(null)
                  setPreviewScreen(null)
                }}
                className="ml-auto px-3 py-1 text-sm bg-slate-100 hover:bg-slate-200 rounded-lg"
              >
                Zuruecksetzen
              </button>
            </div>
          ) : (
            <div className="text-slate-500 text-sm">
              Klicke auf einen Screen um den Subtree zu sehen
            </div>
          )}
        </div>
      </div>

      {/* Category Filter */}
      <div className="bg-white rounded-xl border border-slate-200 p-4 shadow-sm">
        <div className="flex flex-wrap gap-2">
          <button
            onClick={() => {
              setSelectedCategory(null)
              setSelectedNode(null)
              setPreviewScreen(null)
            }}
            className={`px-4 py-2 rounded-lg text-sm font-medium transition-colors ${
              selectedCategory === null && !selectedNode
                ? 'bg-slate-800 text-white'
                : 'bg-slate-100 text-slate-700 hover:bg-slate-200'
            }`}
          >
            Alle ({SCREENS.length})
          </button>
          {categories.map((key) => {
            const count = SCREENS.filter(s => s.category === key).length
            const catColors = COLORS[key] || { bg: '#f1f5f9', border: '#94a3b8', text: '#475569' }
            return (
              <button
                key={key}
                onClick={() => {
                  setSelectedCategory(selectedCategory === key ? null : key)
                  setSelectedNode(null)
                  setPreviewScreen(null)
                }}
                className="px-4 py-2 rounded-lg text-sm font-medium transition-all flex items-center gap-2"
                style={{
                  background: selectedCategory === key ? catColors.border : catColors.bg,
                  color: selectedCategory === key ? 'white' : catColors.text,
                }}
              >
                <span className="w-3 h-3 rounded-full" style={{ background: catColors.border }} />
                {LABELS[key]} ({count})
              </button>
            )
          })}
        </div>
      </div>

      {/* Connected Screens List */}
      {selectedNode && connectedScreens.length > 1 && (
        <div className="bg-white rounded-xl border border-slate-200 p-4 shadow-sm">
          <div className="text-sm font-medium text-slate-700 mb-3">Verbundene Screens:</div>
          <div className="flex flex-wrap gap-2">
            {connectedScreens.map((screen) => {
              const catColors = COLORS[screen.category] || { bg: '#f1f5f9', border: '#94a3b8', text: '#475569' }
              const isCurrentNode = screen.id === selectedNode
              return (
                <button
                  key={screen.id}
                  onClick={() => {
                    if (screen.url) {
                      window.open(`${baseUrl}${screen.url}`, '_blank')
                    }
                  }}
                  className={`px-3 py-2 rounded-lg text-sm font-medium transition-all flex items-center gap-2 ${
                    isCurrentNode ? 'ring-2 ring-violet-500' : ''
                  }`}
                  style={{
                    background: isCurrentNode ? catColors.border : catColors.bg,
                    color: isCurrentNode ? 'white' : catColors.text,
                  }}
                >
                  <span>{screen.icon}</span>
                  {screen.name}
                </button>
              )
            })}
          </div>
        </div>
      )}

      {/* Flow Diagram */}
      <div className="bg-white rounded-xl border border-slate-200 shadow-sm overflow-hidden" style={{ height: '500px' }}>
        <ReactFlow
          nodes={nodes}
          edges={edges}
          onNodesChange={onNodesChange}
          onEdgesChange={onEdgesChange}
          onNodeClick={onNodeClick}
          onPaneClick={onPaneClick}
          fitView
          fitViewOptions={{ padding: 0.2 }}
          attributionPosition="bottom-left"
        >
          <Controls />
          <MiniMap
            nodeColor={(node) => {
              const screen = SCREENS.find(s => s.id === node.id)
              const catColors = screen ? COLORS[screen.category] : null
              return catColors?.border || '#94a3b8'
            }}
            maskColor="rgba(0, 0, 0, 0.1)"
          />
          <Background variant={BackgroundVariant.Dots} gap={12} size={1} />

          <Panel position="top-left" className="bg-white/95 p-3 rounded-lg shadow-lg text-xs">
            <div className="font-medium text-slate-700 mb-2">
              🛡️ Compliance SDK
            </div>
            <div className="space-y-1">
              {categories.slice(0, 5).map((key) => {
                const catColors = COLORS[key] || { bg: '#f1f5f9', border: '#94a3b8' }
                return (
                  <div key={key} className="flex items-center gap-2">
                    <span
                      className="w-3 h-3 rounded"
                      style={{ background: catColors.bg, border: `1px solid ${catColors.border}` }}
                    />
                    <span className="text-slate-600">{LABELS[key]}</span>
                  </div>
                )
              })}
            </div>
            <div className="mt-2 pt-2 border-t text-slate-400">
              Klick = Subtree<br/>
              Doppelklick = Oeffnen
            </div>
          </Panel>
        </ReactFlow>
      </div>

      {/* Screen List */}
      <div className="bg-white rounded-xl border border-slate-200 shadow-sm overflow-hidden">
        <div className="px-4 py-3 bg-slate-50 border-b flex items-center justify-between">
          <h3 className="font-medium text-slate-700">
            Alle Screens ({SCREENS.length})
          </h3>
          <span className="text-xs text-slate-400">{baseUrl}</span>
        </div>
        <div className="divide-y max-h-80 overflow-y-auto">
          {SCREENS
            .filter(s => !selectedCategory || s.category === selectedCategory)
            .map((screen) => {
              const catColors = COLORS[screen.category] || { bg: '#f1f5f9', border: '#94a3b8', text: '#475569' }
              return (
                <button
                  key={screen.id}
                  onClick={() => {
                    setSelectedNode(screen.id)
                    setSelectedCategory(null)
                    setPreviewScreen(screen)
                  }}
                  className="w-full flex items-center gap-4 p-3 hover:bg-slate-50 transition-colors text-left"
                >
                  <span
                    className="w-9 h-9 rounded-lg flex items-center justify-center text-lg"
                    style={{ background: catColors.bg }}
                  >
                    {screen.icon}
                  </span>
                  <div className="flex-1 min-w-0">
                    <div className="font-medium text-slate-800 text-sm">{screen.name}</div>
                    <div className="text-xs text-slate-500 truncate">{screen.description}</div>
                  </div>
                  <span
                    className="px-2 py-1 rounded text-xs font-medium shrink-0"
                    style={{ background: catColors.bg, color: catColors.text }}
                  >
                    {LABELS[screen.category]}
                  </span>
                </button>
              )
            })}
        </div>
      </div>
    </div>
  )
}