'use client'

import React, { useState, useEffect } from 'react'
import { useSDK, Requirement as SDKRequirement, RequirementStatus, RiskSeverity } from '@/lib/sdk'
import { StepHeader, STEP_EXPLANATIONS } from '@/components/sdk/StepHeader'

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

type DisplayPriority = 'critical' | 'high' | 'medium' | 'low'
type DisplayStatus = 'compliant' | 'partial' | 'non-compliant' | 'not-applicable'

interface DisplayRequirement extends SDKRequirement {
  code: string
  source: string
  category: string
  priority: DisplayPriority
  displayStatus: DisplayStatus
  controlsLinked: number
  evidenceCount: number
}

// =============================================================================
// HELPER FUNCTIONS
// =============================================================================

function mapCriticalityToPriority(criticality: RiskSeverity): DisplayPriority {
  switch (criticality) {
    case 'CRITICAL': return 'critical'
    case 'HIGH': return 'high'
    case 'MEDIUM': return 'medium'
    case 'LOW': return 'low'
    default: return 'medium'
  }
}

function mapStatusToDisplayStatus(status: RequirementStatus): DisplayStatus {
  switch (status) {
    case 'VERIFIED':
    case 'IMPLEMENTED': return 'compliant'
    case 'IN_PROGRESS': return 'partial'
    case 'NOT_STARTED': return 'non-compliant'
    default: return 'non-compliant'
  }
}

// =============================================================================
// FALLBACK TEMPLATES (used when backend is unavailable)
// =============================================================================

const requirementTemplates: Omit<DisplayRequirement, 'displayStatus' | 'controlsLinked' | 'evidenceCount'>[] = [
  {
    id: 'req-gdpr-6',
    regulation: 'DSGVO',
    article: 'Art. 6',
    code: 'GDPR-6.1',
    title: 'Rechtmaessigkeit der Verarbeitung',
    description: 'Personenbezogene Daten duerfen nur verarbeitet werden, wenn eine Rechtsgrundlage vorliegt.',
    source: 'DSGVO Art. 6',
    category: 'Rechtmaessigkeit',
    priority: 'critical',
    criticality: 'CRITICAL',
    applicableModules: ['mod-gdpr'],
    status: 'NOT_STARTED',
    controls: [],
  },
  {
    id: 'req-gdpr-13',
    regulation: 'DSGVO',
    article: 'Art. 13/14',
    code: 'GDPR-13',
    title: 'Informationspflichten',
    description: 'Betroffene Personen muessen ueber die Datenverarbeitung informiert werden.',
    source: 'DSGVO Art. 13/14',
    category: 'Transparenz',
    priority: 'high',
    criticality: 'HIGH',
    applicableModules: ['mod-gdpr'],
    status: 'NOT_STARTED',
    controls: [],
  },
  {
    id: 'req-ai-act-9',
    regulation: 'AI Act',
    article: 'Art. 9',
    code: 'AI-ACT-9',
    title: 'Risikomanagementsystem',
    description: 'Hochrisiko-KI-Systeme erfordern ein Risikomanagementsystem.',
    source: 'AI Act Art. 9',
    category: 'KI-Governance',
    priority: 'high',
    criticality: 'HIGH',
    applicableModules: ['mod-ai-act'],
    status: 'NOT_STARTED',
    controls: [],
  },
  {
    id: 'req-gdpr-32',
    regulation: 'DSGVO',
    article: 'Art. 32',
    code: 'GDPR-32',
    title: 'Sicherheit der Verarbeitung',
    description: 'Geeignete technische und organisatorische Massnahmen zur Datensicherheit.',
    source: 'DSGVO Art. 32',
    category: 'Sicherheit',
    priority: 'critical',
    criticality: 'CRITICAL',
    applicableModules: ['mod-gdpr', 'mod-iso27001'],
    status: 'NOT_STARTED',
    controls: [],
  },
  {
    id: 'req-gdpr-35',
    regulation: 'DSGVO',
    article: 'Art. 35',
    code: 'GDPR-35',
    title: 'Datenschutz-Folgenabschaetzung',
    description: 'Bei hohem Risiko ist eine DSFA durchzufuehren.',
    source: 'DSGVO Art. 35',
    category: 'Risikobewertung',
    priority: 'high',
    criticality: 'HIGH',
    applicableModules: ['mod-gdpr'],
    status: 'NOT_STARTED',
    controls: [],
  },
  {
    id: 'req-ai-act-13',
    regulation: 'AI Act',
    article: 'Art. 13',
    code: 'AI-ACT-13',
    title: 'Transparenzanforderungen',
    description: 'KI-Systeme muessen fuer Nutzer nachvollziehbar und transparent sein.',
    source: 'AI Act Art. 13',
    category: 'Transparenz',
    priority: 'high',
    criticality: 'HIGH',
    applicableModules: ['mod-ai-act'],
    status: 'NOT_STARTED',
    controls: [],
  },
  {
    id: 'req-nis2-21',
    regulation: 'NIS2',
    article: 'Art. 21',
    code: 'NIS2-21',
    title: 'Risikomanagementmassnahmen',
    description: 'Wesentliche und wichtige Einrichtungen muessen Cybersicherheitsmassnahmen implementieren.',
    source: 'NIS2 Art. 21',
    category: 'Cybersicherheit',
    priority: 'high',
    criticality: 'HIGH',
    applicableModules: ['mod-nis2'],
    status: 'NOT_STARTED',
    controls: [],
  },
]

// =============================================================================
// COMPONENTS
// =============================================================================

function AddRequirementForm({
  onSubmit,
  onCancel,
}: {
  onSubmit: (data: { regulation: string; article: string; title: string; description: string; criticality: RiskSeverity }) => void
  onCancel: () => void
}) {
  const [formData, setFormData] = useState({
    regulation: '',
    article: '',
    title: '',
    description: '',
    criticality: 'MEDIUM' as RiskSeverity,
  })

  return (
    <div className="bg-white rounded-xl border border-gray-200 p-6">
      <h3 className="text-lg font-semibold text-gray-900 mb-4">Neue Anforderung</h3>
      <div className="space-y-4">
        <div className="grid grid-cols-2 gap-4">
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1">Verordnung *</label>
            <input
              type="text"
              value={formData.regulation}
              onChange={e => setFormData({ ...formData, regulation: e.target.value })}
              placeholder="z.B. DSGVO"
              className="w-full px-4 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 focus:border-transparent"
            />
          </div>
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1">Artikel</label>
            <input
              type="text"
              value={formData.article}
              onChange={e => setFormData({ ...formData, article: e.target.value })}
              placeholder="z.B. Art. 6"
              className="w-full px-4 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 focus:border-transparent"
            />
          </div>
        </div>
        <div>
          <label className="block text-sm font-medium text-gray-700 mb-1">Titel *</label>
          <input
            type="text"
            value={formData.title}
            onChange={e => setFormData({ ...formData, title: e.target.value })}
            placeholder="z.B. Rechtmaessigkeit der Verarbeitung"
            className="w-full px-4 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 focus:border-transparent"
          />
        </div>
        <div>
          <label className="block text-sm font-medium text-gray-700 mb-1">Beschreibung</label>
          <textarea
            value={formData.description}
            onChange={e => setFormData({ ...formData, description: e.target.value })}
            placeholder="Beschreiben Sie die Anforderung..."
            rows={3}
            className="w-full px-4 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 focus:border-transparent"
          />
        </div>
        <div>
          <label className="block text-sm font-medium text-gray-700 mb-1">Kritikalitaet</label>
          <select
            value={formData.criticality}
            onChange={e => setFormData({ ...formData, criticality: e.target.value as RiskSeverity })}
            className="w-full px-4 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 focus:border-transparent"
          >
            <option value="LOW">Niedrig</option>
            <option value="MEDIUM">Mittel</option>
            <option value="HIGH">Hoch</option>
            <option value="CRITICAL">Kritisch</option>
          </select>
        </div>
      </div>
      <div className="mt-6 flex items-center justify-end gap-3">
        <button onClick={onCancel} className="px-4 py-2 text-gray-600 hover:bg-gray-100 rounded-lg transition-colors">
          Abbrechen
        </button>
        <button
          onClick={() => onSubmit(formData)}
          disabled={!formData.title || !formData.regulation}
          className={`px-6 py-2 rounded-lg font-medium transition-colors ${
            formData.title && formData.regulation ? 'bg-purple-600 text-white hover:bg-purple-700' : 'bg-gray-200 text-gray-400 cursor-not-allowed'
          }`}
        >
          Hinzufuegen
        </button>
      </div>
    </div>
  )
}

function RequirementCard({
  requirement,
  onStatusChange,
  onDelete,
  expanded,
  onToggleDetails,
  linkedControls,
}: {
  requirement: DisplayRequirement
  onStatusChange: (status: RequirementStatus) => void
  onDelete: () => void
  expanded: boolean
  onToggleDetails: () => void
  linkedControls: { id: string; name: string }[]
}) {
  const priorityColors = {
    critical: 'bg-red-100 text-red-700',
    high: 'bg-orange-100 text-orange-700',
    medium: 'bg-yellow-100 text-yellow-700',
    low: 'bg-green-100 text-green-700',
  }

  const statusColors = {
    compliant: 'bg-green-100 text-green-700 border-green-200',
    partial: 'bg-yellow-100 text-yellow-700 border-yellow-200',
    'non-compliant': 'bg-red-100 text-red-700 border-red-200',
    'not-applicable': 'bg-gray-100 text-gray-500 border-gray-200',
  }

  return (
    <div className={`bg-white rounded-xl border-2 p-6 ${statusColors[requirement.displayStatus]}`}>
      <div className="flex items-start justify-between">
        <div className="flex-1">
          <div className="flex items-center gap-2 mb-2">
            <span className="px-2 py-1 text-xs bg-gray-100 text-gray-700 rounded font-mono">
              {requirement.code}
            </span>
            <span className={`px-2 py-1 text-xs rounded-full ${priorityColors[requirement.priority]}`}>
              {requirement.priority === 'critical' ? 'Kritisch' :
               requirement.priority === 'high' ? 'Hoch' :
               requirement.priority === 'medium' ? 'Mittel' : 'Niedrig'}
            </span>
            <span className="px-2 py-1 text-xs bg-blue-50 text-blue-600 rounded">
              {requirement.regulation}
            </span>
          </div>
          <h3 className="text-lg font-semibold text-gray-900">{requirement.title}</h3>
          <p className="text-sm text-gray-500 mt-1">{requirement.description}</p>
          <p className="text-xs text-gray-400 mt-2">Quelle: {requirement.source}</p>
        </div>
        <select
          value={requirement.status}
          onChange={(e) => onStatusChange(e.target.value as RequirementStatus)}
          className={`px-3 py-1 text-sm rounded-full border ${statusColors[requirement.displayStatus]}`}
        >
          <option value="NOT_STARTED">Nicht begonnen</option>
          <option value="IN_PROGRESS">In Bearbeitung</option>
          <option value="IMPLEMENTED">Implementiert</option>
          <option value="VERIFIED">Verifiziert</option>
        </select>
      </div>

      <div className="mt-4 pt-4 border-t border-gray-100 flex items-center justify-between">
        <div className="flex items-center gap-4 text-sm text-gray-500">
          <span>{requirement.controlsLinked} Kontrollen</span>
          <span>{requirement.evidenceCount} Nachweise</span>
        </div>
        <button
          onClick={onToggleDetails}
          className="text-sm text-purple-600 hover:text-purple-700 font-medium"
        >
          {expanded ? 'Details ausblenden' : 'Details anzeigen'}
        </button>
      </div>

      {expanded && (
        <div className="mt-4 pt-4 border-t border-gray-200 space-y-3">
          <div>
            <h4 className="text-sm font-medium text-gray-700 mb-1">Vollstaendige Beschreibung</h4>
            <p className="text-sm text-gray-600">{requirement.description || 'Keine Beschreibung vorhanden.'}</p>
          </div>
          <div>
            <h4 className="text-sm font-medium text-gray-700 mb-1">Zugeordnete Kontrollen ({linkedControls.length})</h4>
            {linkedControls.length > 0 ? (
              <div className="flex flex-wrap gap-2">
                {linkedControls.map(c => (
                  <span key={c.id} className="px-2 py-1 text-xs bg-green-50 text-green-700 rounded">{c.name}</span>
                ))}
              </div>
            ) : (
              <p className="text-sm text-gray-400">Keine Kontrollen zugeordnet</p>
            )}
          </div>
          <div className="flex items-center justify-between">
            <div>
              <h4 className="text-sm font-medium text-gray-700 mb-1">Status-Historie</h4>
              <div className="flex items-center gap-2 text-sm text-gray-500">
                <span className={`px-2 py-0.5 text-xs rounded-full ${
                  requirement.displayStatus === 'compliant' ? 'bg-green-100 text-green-700' :
                  requirement.displayStatus === 'partial' ? 'bg-yellow-100 text-yellow-700' :
                  'bg-red-100 text-red-700'
                }`}>
                  {requirement.status === 'NOT_STARTED' ? 'Nicht begonnen' :
                   requirement.status === 'IN_PROGRESS' ? 'In Bearbeitung' :
                   requirement.status === 'IMPLEMENTED' ? 'Implementiert' : 'Verifiziert'}
                </span>
              </div>
            </div>
            <button
              onClick={onDelete}
              className="px-3 py-1 text-sm text-red-600 hover:bg-red-50 border border-red-200 rounded-lg transition-colors"
            >
              Loeschen
            </button>
          </div>
        </div>
      )}
    </div>
  )
}

function LoadingSkeleton() {
  return (
    <div className="space-y-4">
      {[1, 2, 3].map(i => (
        <div key={i} className="bg-white rounded-xl border border-gray-200 p-6 animate-pulse">
          <div className="flex items-center gap-2 mb-3">
            <div className="h-5 w-20 bg-gray-200 rounded" />
            <div className="h-5 w-16 bg-gray-200 rounded-full" />
          </div>
          <div className="h-6 w-3/4 bg-gray-200 rounded mb-2" />
          <div className="h-4 w-full bg-gray-100 rounded" />
        </div>
      ))}
    </div>
  )
}

// =============================================================================
// MAIN PAGE
// =============================================================================

export default function RequirementsPage() {
  const { state, dispatch } = useSDK()
  const [filter, setFilter] = useState<string>('all')
  const [searchQuery, setSearchQuery] = useState('')
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)
  const [showAddForm, setShowAddForm] = useState(false)
  const [expandedId, setExpandedId] = useState<string | null>(null)
  const [ragExtracting, setRagExtracting] = useState(false)
  const [ragResult, setRagResult] = useState<{ created: number; skipped_duplicates: number; message: string } | null>(null)

  const extractFromRAG = async () => {
    setRagExtracting(true)
    setRagResult(null)
    try {
      const res = await fetch('/api/sdk/v1/compliance/extract-requirements-from-rag', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ max_per_query: 20 }),
      })
      if (res.ok) {
        const data = await res.json()
        setRagResult({ created: data.created, skipped_duplicates: data.skipped_duplicates, message: data.message })
        // Reload requirements list
        const listRes = await fetch('/api/sdk/v1/compliance/requirements')
        if (listRes.ok) {
          const listData = await listRes.json()
          const reqs = listData.requirements || listData
          if (Array.isArray(reqs) && reqs.length > 0) {
            const mapped = reqs.map((r: Record<string, unknown>) => ({
              id: (r.requirement_id || r.id) as string,
              regulation: (r.regulation_code || r.regulation || '') as string,
              article: (r.article || '') as string,
              title: (r.title || '') as string,
              description: (r.description || '') as string,
              criticality: ((r.criticality || r.priority || 'MEDIUM') as string).toUpperCase() as import('@/lib/sdk').RiskSeverity,
              applicableModules: [] as string[],
              status: 'NOT_STARTED' as import('@/lib/sdk').RequirementStatus,
              controls: [] as string[],
            }))
            dispatch({ type: 'SET_STATE', payload: { requirements: mapped } })
          }
        }
      } else {
        setRagResult({ created: 0, skipped_duplicates: 0, message: 'RAG-Extraktion fehlgeschlagen' })
      }
    } catch {
      setRagResult({ created: 0, skipped_duplicates: 0, message: 'RAG-Extraktion nicht erreichbar' })
    } finally {
      setRagExtracting(false)
    }
  }

  // Fetch requirements from backend on mount
  useEffect(() => {
    const fetchRequirements = async () => {
      try {
        setLoading(true)
        const res = await fetch('/api/sdk/v1/compliance/requirements')
        if (res.ok) {
          const data = await res.json()
          const backendRequirements = data.requirements || data
          if (Array.isArray(backendRequirements) && backendRequirements.length > 0) {
            // Map backend data to SDK format and load into state
            const mapped: SDKRequirement[] = backendRequirements.map((r: Record<string, unknown>) => ({
              id: (r.requirement_id || r.id) as string,
              regulation: (r.regulation_code || r.regulation || '') as string,
              article: (r.article || '') as string,
              title: (r.title || '') as string,
              description: (r.description || '') as string,
              criticality: ((r.criticality || r.priority || 'MEDIUM') as string).toUpperCase() as RiskSeverity,
              applicableModules: (r.applicable_modules || []) as string[],
              status: (r.status || 'NOT_STARTED') as RequirementStatus,
              controls: (r.controls || []) as string[],
            }))
            dispatch({ type: 'SET_STATE', payload: { requirements: mapped } })
            setError(null)
            return
          }
        }
        // If backend returns empty or fails, fall back to templates
        loadFromTemplates()
      } catch {
        // Backend unavailable — use templates
        loadFromTemplates()
      } finally {
        setLoading(false)
      }
    }

    const loadFromTemplates = () => {
      if (state.requirements.length > 0) return // Already have data
      if (state.modules.length === 0) return // No modules yet

      const activeModuleIds = state.modules.map(m => m.id)
      const relevantRequirements = requirementTemplates.filter(r =>
        r.applicableModules.some(m => activeModuleIds.includes(m))
      )

      relevantRequirements.forEach(req => {
        const sdkRequirement: SDKRequirement = {
          id: req.id,
          regulation: req.regulation,
          article: req.article,
          title: req.title,
          description: req.description,
          criticality: req.criticality,
          applicableModules: req.applicableModules,
          status: 'NOT_STARTED',
          controls: [],
        }
        dispatch({ type: 'ADD_REQUIREMENT', payload: sdkRequirement })
      })
    }

    fetchRequirements()
  }, []) // eslint-disable-line react-hooks/exhaustive-deps

  // Convert SDK requirements to display requirements
  const displayRequirements: DisplayRequirement[] = state.requirements.map(req => {
    const template = requirementTemplates.find(t => t.id === req.id)
    const linkedControls = state.controls.filter(c => c.evidence.includes(req.id))
    const linkedEvidence = state.evidence.filter(e => e.controlId && linkedControls.some(c => c.id === e.controlId))

    return {
      ...req,
      code: template?.code || req.id,
      source: template?.source || `${req.regulation} ${req.article}`,
      category: template?.category || req.regulation,
      priority: mapCriticalityToPriority(req.criticality),
      displayStatus: mapStatusToDisplayStatus(req.status),
      controlsLinked: linkedControls.length,
      evidenceCount: linkedEvidence.length,
    }
  })

  const filteredRequirements = displayRequirements.filter(req => {
    const matchesFilter = filter === 'all' ||
      req.displayStatus === filter ||
      req.priority === filter
    const matchesSearch = searchQuery === '' ||
      req.title.toLowerCase().includes(searchQuery.toLowerCase()) ||
      req.code.toLowerCase().includes(searchQuery.toLowerCase())
    return matchesFilter && matchesSearch
  })

  const compliantCount = displayRequirements.filter(r => r.displayStatus === 'compliant').length
  const partialCount = displayRequirements.filter(r => r.displayStatus === 'partial').length
  const nonCompliantCount = displayRequirements.filter(r => r.displayStatus === 'non-compliant').length

  const handleStatusChange = async (requirementId: string, status: RequirementStatus) => {
    const previousStatus = state.requirements.find(r => r.id === requirementId)?.status
    dispatch({
      type: 'UPDATE_REQUIREMENT',
      payload: { id: requirementId, data: { status } },
    })

    // Persist to backend
    try {
      const res = await fetch(`/api/sdk/v1/compliance/requirements/${requirementId}`, {
        method: 'PUT',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ implementation_status: status.toLowerCase() }),
      })
      if (!res.ok) {
        // Rollback on failure
        if (previousStatus) {
          dispatch({ type: 'UPDATE_REQUIREMENT', payload: { id: requirementId, data: { status: previousStatus } } })
        }
        setError('Status-Aenderung konnte nicht gespeichert werden')
      }
    } catch {
      if (previousStatus) {
        dispatch({ type: 'UPDATE_REQUIREMENT', payload: { id: requirementId, data: { status: previousStatus } } })
      }
      setError('Backend nicht erreichbar — Aenderung zurueckgesetzt')
    }
  }

  const handleDeleteRequirement = async (requirementId: string) => {
    if (!confirm('Anforderung wirklich loeschen?')) return

    try {
      const res = await fetch(`/api/sdk/v1/compliance/requirements/${requirementId}`, {
        method: 'DELETE',
      })
      if (res.ok) {
        dispatch({ type: 'SET_STATE', payload: { requirements: state.requirements.filter(r => r.id !== requirementId) } })
      } else {
        setError('Loeschen fehlgeschlagen')
      }
    } catch {
      setError('Backend nicht erreichbar')
    }
  }

  const handleAddRequirement = async (data: { regulation: string; article: string; title: string; description: string; criticality: RiskSeverity }) => {
    // Try to resolve regulation_id from backend
    let regulationId = ''
    try {
      const regRes = await fetch(`/api/sdk/v1/compliance/regulations/${data.regulation}`)
      if (regRes.ok) {
        const regData = await regRes.json()
        regulationId = regData.id
      }
    } catch {
      // Regulation not found — still add locally
    }

    const priorityMap: Record<string, number> = { LOW: 1, MEDIUM: 2, HIGH: 3, CRITICAL: 4 }

    if (regulationId) {
      try {
        const res = await fetch('/api/sdk/v1/compliance/requirements', {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify({
            regulation_id: regulationId,
            article: data.article,
            title: data.title,
            description: data.description,
            priority: priorityMap[data.criticality] || 2,
          }),
        })
        if (res.ok) {
          const created = await res.json()
          const newReq: SDKRequirement = {
            id: created.id,
            regulation: data.regulation,
            article: data.article,
            title: data.title,
            description: data.description,
            criticality: data.criticality,
            applicableModules: [],
            status: 'NOT_STARTED',
            controls: [],
          }
          dispatch({ type: 'ADD_REQUIREMENT', payload: newReq })
          setShowAddForm(false)
          return
        }
      } catch {
        // Fall through to local-only add
      }
    }

    // Fallback: add locally only
    const newReq: SDKRequirement = {
      id: `req-${Date.now()}`,
      regulation: data.regulation,
      article: data.article,
      title: data.title,
      description: data.description,
      criticality: data.criticality,
      applicableModules: [],
      status: 'NOT_STARTED',
      controls: [],
    }
    dispatch({ type: 'ADD_REQUIREMENT', payload: newReq })
    setShowAddForm(false)
  }

  const stepInfo = STEP_EXPLANATIONS['requirements']

  return (
    <div className="space-y-6">
      {/* Step Header */}
      <StepHeader
        stepId="requirements"
        title={stepInfo.title}
        description={stepInfo.description}
        explanation={stepInfo.explanation}
        tips={stepInfo.tips}
      >
        <div className="flex items-center gap-2">
          <button
            onClick={extractFromRAG}
            disabled={ragExtracting}
            className="flex items-center gap-2 px-4 py-2 bg-indigo-600 text-white rounded-lg hover:bg-indigo-700 disabled:opacity-60 transition-colors"
          >
            {ragExtracting ? (
              <svg className="w-4 h-4 animate-spin" fill="none" viewBox="0 0 24 24">
                <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4" />
                <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8v8H4z" />
              </svg>
            ) : (
              <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9.663 17h4.673M12 3v1m6.364 1.636l-.707.707M21 12h-1M4 12H3m3.343-5.657l-.707-.707m2.828 9.9a5 5 0 117.072 0l-.347.347a3.5 3.5 0 01-4.95 0l-.347-.347z" />
              </svg>
            )}
            Aus RAG extrahieren
          </button>
          <button
            onClick={() => setShowAddForm(true)}
            className="flex items-center gap-2 px-4 py-2 bg-purple-600 text-white rounded-lg hover:bg-purple-700 transition-colors"
          >
            <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 6v6m0 0v6m0-6h6m-6 0H6" />
            </svg>
            Anforderung hinzufuegen
          </button>
        </div>
      </StepHeader>

      {/* RAG Extraction Result Banner */}
      {ragResult && (
        <div className={`flex items-center justify-between p-3 rounded-lg border ${ragResult.created > 0 ? 'bg-green-50 border-green-200' : 'bg-blue-50 border-blue-200'}`}>
          <span className="text-sm">
            {ragResult.created > 0 ? '✅' : 'ℹ️'} {ragResult.message}
          </span>
          <button onClick={() => setRagResult(null)} className="text-gray-400 hover:text-gray-600 ml-4">&times;</button>
        </div>
      )}

      {/* Add Form */}
      {showAddForm && (
        <AddRequirementForm
          onSubmit={handleAddRequirement}
          onCancel={() => setShowAddForm(false)}
        />
      )}

      {/* Error Banner */}
      {error && (
        <div className="p-4 bg-red-50 border border-red-200 rounded-lg text-red-700 flex items-center justify-between">
          <span>{error}</span>
          <button onClick={() => setError(null)} className="text-red-500 hover:text-red-700">&times;</button>
        </div>
      )}

      {/* Module Alert */}
      {state.modules.length === 0 && !loading && (
        <div className="bg-amber-50 border border-amber-200 rounded-xl p-4">
          <div className="flex items-start gap-3">
            <svg className="w-5 h-5 text-amber-600 mt-0.5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-3L13.732 4c-.77-1.333-2.694-1.333-3.464 0L3.34 16c-.77 1.333.192 3 1.732 3z" />
            </svg>
            <div>
              <h4 className="font-medium text-amber-800">Keine Module aktiviert</h4>
              <p className="text-sm text-amber-700 mt-1">
                Bitte aktivieren Sie zuerst Compliance-Module, um die zugehoerigen Anforderungen zu laden.
              </p>
            </div>
          </div>
        </div>
      )}

      {/* Stats */}
      <div className="grid grid-cols-1 md:grid-cols-4 gap-4">
        <div className="bg-white rounded-xl border border-gray-200 p-6">
          <div className="text-sm text-gray-500">Gesamt</div>
          <div className="text-3xl font-bold text-gray-900">{displayRequirements.length}</div>
        </div>
        <div className="bg-white rounded-xl border border-green-200 p-6">
          <div className="text-sm text-green-600">Konform</div>
          <div className="text-3xl font-bold text-green-600">{compliantCount}</div>
        </div>
        <div className="bg-white rounded-xl border border-yellow-200 p-6">
          <div className="text-sm text-yellow-600">In Bearbeitung</div>
          <div className="text-3xl font-bold text-yellow-600">{partialCount}</div>
        </div>
        <div className="bg-white rounded-xl border border-red-200 p-6">
          <div className="text-sm text-red-600">Offen</div>
          <div className="text-3xl font-bold text-red-600">{nonCompliantCount}</div>
        </div>
      </div>

      {/* Search and Filter */}
      <div className="flex items-center gap-4">
        <div className="flex-1 relative">
          <svg className="w-5 h-5 text-gray-400 absolute left-3 top-1/2 -translate-y-1/2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z" />
          </svg>
          <input
            type="text"
            value={searchQuery}
            onChange={(e) => setSearchQuery(e.target.value)}
            placeholder="Anforderungen durchsuchen..."
            className="w-full pl-10 pr-4 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 focus:border-transparent"
          />
        </div>
        <div className="flex items-center gap-2">
          {['all', 'compliant', 'partial', 'non-compliant', 'critical'].map(f => (
            <button
              key={f}
              onClick={() => setFilter(f)}
              className={`px-3 py-1 text-sm rounded-full transition-colors ${
                filter === f
                  ? 'bg-purple-600 text-white'
                  : 'bg-gray-100 text-gray-600 hover:bg-gray-200'
              }`}
            >
              {f === 'all' ? 'Alle' :
               f === 'compliant' ? 'Konform' :
               f === 'partial' ? 'Teilweise' :
               f === 'non-compliant' ? 'Offen' : 'Kritisch'}
            </button>
          ))}
        </div>
      </div>

      {/* Loading State */}
      {loading && <LoadingSkeleton />}

      {/* Requirements List */}
      {!loading && (
        <div className="space-y-4">
          {filteredRequirements.map(requirement => {
            const linkedControls = state.controls
              .filter(c => c.evidence.includes(requirement.id))
              .map(c => ({ id: c.id, name: c.name }))
            return (
              <RequirementCard
                key={requirement.id}
                requirement={requirement}
                onStatusChange={(status) => handleStatusChange(requirement.id, status)}
                onDelete={() => handleDeleteRequirement(requirement.id)}
                expanded={expandedId === requirement.id}
                onToggleDetails={() => setExpandedId(expandedId === requirement.id ? null : requirement.id)}
                linkedControls={linkedControls}
              />
            )
          })}
        </div>
      )}

      {!loading && filteredRequirements.length === 0 && state.modules.length > 0 && (
        <div className="bg-white rounded-xl border border-gray-200 p-12 text-center">
          <div className="w-16 h-16 mx-auto bg-gray-100 rounded-full flex items-center justify-center mb-4">
            <svg className="w-8 h-8 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2" />
            </svg>
          </div>
          <h3 className="text-lg font-semibold text-gray-900">Keine Anforderungen gefunden</h3>
          <p className="mt-2 text-gray-500">Passen Sie die Suche oder den Filter an.</p>
        </div>
      )}
    </div>
  )
}