'use client'

import React, { useState, useEffect } from 'react'
import { useRouter } from 'next/navigation'
import { useSDK, Control as SDKControl, ControlType, ImplementationStatus } from '@/lib/sdk'
import { StepHeader, STEP_EXPLANATIONS } from '@/components/sdk/StepHeader'

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

type DisplayControlType = 'preventive' | 'detective' | 'corrective'
type DisplayCategory = 'technical' | 'organizational' | 'physical'
type DisplayStatus = 'implemented' | 'partial' | 'planned' | 'not-implemented'

interface DisplayControl {
  id: string
  name: string
  description: string
  type: ControlType
  category: string
  implementationStatus: ImplementationStatus
  evidence: string[]
  owner: string | null
  dueDate: Date | null
  code: string
  displayType: DisplayControlType
  displayCategory: DisplayCategory
  displayStatus: DisplayStatus
  effectivenessPercent: number
  linkedRequirements: string[]
  linkedEvidence: { id: string; title: string; status: string }[]
  lastReview: Date
}

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

function mapControlTypeToDisplay(type: ControlType): DisplayCategory {
  switch (type) {
    case 'TECHNICAL': return 'technical'
    case 'ORGANIZATIONAL': return 'organizational'
    case 'PHYSICAL': return 'physical'
    default: return 'technical'
  }
}

function mapStatusToDisplay(status: ImplementationStatus): DisplayStatus {
  switch (status) {
    case 'IMPLEMENTED': return 'implemented'
    case 'PARTIAL': return 'partial'
    case 'NOT_IMPLEMENTED': return 'not-implemented'
    default: return 'not-implemented'
  }
}

// =============================================================================
// FALLBACK TEMPLATES
// =============================================================================

interface ControlTemplate {
  id: string
  code: string
  name: string
  description: string
  type: ControlType
  displayType: DisplayControlType
  displayCategory: DisplayCategory
  category: string
  owner: string
  linkedRequirements: string[]
}

const controlTemplates: ControlTemplate[] = [
  {
    id: 'ctrl-tom-001',
    code: 'TOM-001',
    name: 'Zugriffskontrolle',
    description: 'Rollenbasierte Zugriffskontrolle (RBAC) fuer alle Systeme',
    type: 'TECHNICAL',
    displayType: 'preventive',
    displayCategory: 'technical',
    category: 'Zutrittskontrolle',
    owner: 'IT Security',
    linkedRequirements: ['req-gdpr-32'],
  },
  {
    id: 'ctrl-tom-002',
    code: 'TOM-002',
    name: 'Verschluesselung',
    description: 'Verschluesselung von Daten at rest und in transit',
    type: 'TECHNICAL',
    displayType: 'preventive',
    displayCategory: 'technical',
    category: 'Weitergabekontrolle',
    owner: 'IT Security',
    linkedRequirements: ['req-gdpr-32'],
  },
  {
    id: 'ctrl-org-001',
    code: 'ORG-001',
    name: 'Datenschutzschulung',
    description: 'Jaehrliche Datenschutzschulung fuer alle Mitarbeiter',
    type: 'ORGANIZATIONAL',
    displayType: 'preventive',
    displayCategory: 'organizational',
    category: 'Schulung',
    owner: 'HR',
    linkedRequirements: ['req-gdpr-6', 'req-gdpr-32'],
  },
  {
    id: 'ctrl-det-001',
    code: 'DET-001',
    name: 'Logging und Monitoring',
    description: 'Umfassendes Logging aller Datenzugriffe',
    type: 'TECHNICAL',
    displayType: 'detective',
    displayCategory: 'technical',
    category: 'Eingabekontrolle',
    owner: 'IT Operations',
    linkedRequirements: ['req-gdpr-32', 'req-nis2-21'],
  },
  {
    id: 'ctrl-cor-001',
    code: 'COR-001',
    name: 'Incident Response',
    description: 'Prozess zur Behandlung von Datenschutzvorfaellen',
    type: 'ORGANIZATIONAL',
    displayType: 'corrective',
    displayCategory: 'organizational',
    category: 'Incident Management',
    owner: 'CISO',
    linkedRequirements: ['req-gdpr-32', 'req-nis2-21'],
  },
  {
    id: 'ctrl-ai-001',
    code: 'AI-001',
    name: 'KI-Risikomonitoring',
    description: 'Kontinuierliche Ueberwachung von KI-Systemrisiken',
    type: 'TECHNICAL',
    displayType: 'detective',
    displayCategory: 'technical',
    category: 'KI-Governance',
    owner: 'AI Team',
    linkedRequirements: ['req-ai-act-9', 'req-ai-act-13'],
  },
]

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

function ControlCard({
  control,
  onStatusChange,
  onEffectivenessChange,
  onLinkEvidence,
}: {
  control: DisplayControl
  onStatusChange: (status: ImplementationStatus) => void
  onEffectivenessChange: (effectivenessPercent: number) => void
  onLinkEvidence: () => void
}) {
  const [showEffectivenessSlider, setShowEffectivenessSlider] = useState(false)

  const typeColors = {
    preventive: 'bg-blue-100 text-blue-700',
    detective: 'bg-purple-100 text-purple-700',
    corrective: 'bg-orange-100 text-orange-700',
  }

  const categoryColors = {
    technical: 'bg-green-100 text-green-700',
    organizational: 'bg-yellow-100 text-yellow-700',
    physical: 'bg-gray-100 text-gray-700',
  }

  const statusColors = {
    implemented: 'border-green-200 bg-green-50',
    partial: 'border-yellow-200 bg-yellow-50',
    planned: 'border-blue-200 bg-blue-50',
    'not-implemented': 'border-red-200 bg-red-50',
  }

  const statusLabels = {
    implemented: 'Implementiert',
    partial: 'Teilweise',
    planned: 'Geplant',
    'not-implemented': 'Nicht implementiert',
  }

  return (
    <div className={`bg-white rounded-xl border-2 p-6 ${statusColors[control.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">
              {control.code}
            </span>
            <span className={`px-2 py-1 text-xs rounded-full ${typeColors[control.displayType]}`}>
              {control.displayType === 'preventive' ? 'Praeventiv' :
               control.displayType === 'detective' ? 'Detektiv' : 'Korrektiv'}
            </span>
            <span className={`px-2 py-1 text-xs rounded-full ${categoryColors[control.displayCategory]}`}>
              {control.displayCategory === 'technical' ? 'Technisch' :
               control.displayCategory === 'organizational' ? 'Organisatorisch' : 'Physisch'}
            </span>
          </div>
          <h3 className="text-lg font-semibold text-gray-900">{control.name}</h3>
          <p className="text-sm text-gray-500 mt-1">{control.description}</p>
        </div>
        <select
          value={control.implementationStatus}
          onChange={(e) => onStatusChange(e.target.value as ImplementationStatus)}
          className={`px-3 py-1 text-sm rounded-full border ${statusColors[control.displayStatus]}`}
        >
          <option value="NOT_IMPLEMENTED">Nicht implementiert</option>
          <option value="PARTIAL">Teilweise</option>
          <option value="IMPLEMENTED">Implementiert</option>
        </select>
      </div>

      <div className="mt-4">
        <div
          className="flex items-center justify-between text-sm mb-1 cursor-pointer"
          onClick={() => setShowEffectivenessSlider(!showEffectivenessSlider)}
        >
          <span className="text-gray-500">Wirksamkeit</span>
          <span className="font-medium">{control.effectivenessPercent}%</span>
        </div>
        <div className="h-2 bg-gray-200 rounded-full overflow-hidden">
          <div
            className={`h-full rounded-full transition-all ${
              control.effectivenessPercent >= 80 ? 'bg-green-500' :
              control.effectivenessPercent >= 50 ? 'bg-yellow-500' : 'bg-red-500'
            }`}
            style={{ width: `${control.effectivenessPercent}%` }}
          />
        </div>
        {showEffectivenessSlider && (
          <div className="mt-2">
            <input
              type="range"
              min={0}
              max={100}
              value={control.effectivenessPercent}
              onChange={(e) => onEffectivenessChange(Number(e.target.value))}
              className="w-full"
            />
          </div>
        )}
      </div>

      <div className="mt-4 pt-4 border-t border-gray-100 flex items-center justify-between text-sm">
        <div className="text-gray-500">
          <span>Verantwortlich: </span>
          <span className="font-medium text-gray-700">{control.owner || 'Nicht zugewiesen'}</span>
        </div>
        <div className="text-gray-500">
          Letzte Pruefung: {control.lastReview.toLocaleDateString('de-DE')}
        </div>
      </div>

      <div className="mt-3 flex items-center justify-between">
        <div className="flex items-center gap-1 flex-wrap">
          {control.linkedRequirements.slice(0, 3).map(req => (
            <span key={req} className="px-2 py-0.5 text-xs bg-gray-100 text-gray-600 rounded">
              {req}
            </span>
          ))}
          {control.linkedRequirements.length > 3 && (
            <span className="px-2 py-0.5 text-xs bg-gray-100 text-gray-600 rounded">
              +{control.linkedRequirements.length - 3}
            </span>
          )}
        </div>
        <span className={`px-3 py-1 text-xs rounded-full ${
          control.displayStatus === 'implemented' ? 'bg-green-100 text-green-700' :
          control.displayStatus === 'partial' ? 'bg-yellow-100 text-yellow-700' :
          control.displayStatus === 'planned' ? 'bg-blue-100 text-blue-700' : 'bg-red-100 text-red-700'
        }`}>
          {statusLabels[control.displayStatus]}
        </span>
      </div>

      {/* Linked Evidence */}
      {control.linkedEvidence.length > 0 && (
        <div className="mt-3 pt-3 border-t border-gray-100">
          <span className="text-xs text-gray-500 mb-1 block">Nachweise:</span>
          <div className="flex items-center gap-1 flex-wrap">
            {control.linkedEvidence.map(ev => (
              <span key={ev.id} className={`px-2 py-0.5 text-xs rounded ${
                ev.status === 'valid' ? 'bg-green-50 text-green-700' :
                ev.status === 'expired' ? 'bg-red-50 text-red-700' :
                'bg-yellow-50 text-yellow-700'
              }`}>
                {ev.title}
              </span>
            ))}
          </div>
        </div>
      )}

      <div className="mt-3 pt-3 border-t border-gray-100">
        <button
          onClick={onLinkEvidence}
          className="text-sm text-purple-600 hover:text-purple-700 font-medium"
        >
          Evidence verknuepfen
        </button>
      </div>
    </div>
  )
}

function AddControlForm({
  onSubmit,
  onCancel,
}: {
  onSubmit: (data: { name: string; description: string; type: ControlType; category: string; owner: string }) => void
  onCancel: () => void
}) {
  const [formData, setFormData] = useState({
    name: '',
    description: '',
    type: 'TECHNICAL' as ControlType,
    category: '',
    owner: '',
  })

  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 Kontrolle</h3>
      <div className="space-y-4">
        <div>
          <label className="block text-sm font-medium text-gray-700 mb-1">Name *</label>
          <input
            type="text"
            value={formData.name}
            onChange={e => setFormData({ ...formData, name: e.target.value })}
            placeholder="z.B. Zugriffskontrolle"
            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 Kontrolle..."
            rows={2}
            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 className="grid grid-cols-3 gap-4">
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1">Typ</label>
            <select
              value={formData.type}
              onChange={e => setFormData({ ...formData, type: e.target.value as ControlType })}
              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="TECHNICAL">Technisch</option>
              <option value="ORGANIZATIONAL">Organisatorisch</option>
              <option value="PHYSICAL">Physisch</option>
            </select>
          </div>
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1">Kategorie</label>
            <input
              type="text"
              value={formData.category}
              onChange={e => setFormData({ ...formData, category: e.target.value })}
              placeholder="z.B. Zutrittskontrolle"
              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">Verantwortlich</label>
            <input
              type="text"
              value={formData.owner}
              onChange={e => setFormData({ ...formData, owner: e.target.value })}
              placeholder="z.B. IT Security"
              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>
      <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.name}
          className={`px-6 py-2 rounded-lg font-medium transition-colors ${
            formData.name ? 'bg-purple-600 text-white hover:bg-purple-700' : 'bg-gray-200 text-gray-400 cursor-not-allowed'
          }`}
        >
          Hinzufuegen
        </button>
      </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 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 className="mt-4 h-2 bg-gray-200 rounded-full" />
        </div>
      ))}
    </div>
  )
}

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

// =============================================================================
// RAG SUGGESTION TYPES
// =============================================================================

interface RAGControlSuggestion {
  control_id: string
  domain: string
  title: string
  description: string
  pass_criteria: string
  implementation_guidance?: string
  is_automated: boolean
  automation_tool?: string
  priority: number
  confidence_score: number
}

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

export default function ControlsPage() {
  const { state, dispatch } = useSDK()
  const router = useRouter()
  const [filter, setFilter] = useState<string>('all')
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)
  const [showAddForm, setShowAddForm] = useState(false)

  // RAG suggestion state
  const [ragLoading, setRagLoading] = useState(false)
  const [ragSuggestions, setRagSuggestions] = useState<RAGControlSuggestion[]>([])
  const [showRagPanel, setShowRagPanel] = useState(false)
  const [selectedRequirementId, setSelectedRequirementId] = useState<string>('')

  // Track effectiveness locally as it's not in the SDK state type
  const [effectivenessMap, setEffectivenessMap] = useState<Record<string, number>>({})
  // Track linked evidence per control
  const [evidenceMap, setEvidenceMap] = useState<Record<string, { id: string; title: string; status: string }[]>>({})

  const fetchEvidenceForControls = async (controlIds: string[]) => {
    try {
      const res = await fetch('/api/sdk/v1/compliance/evidence')
      if (res.ok) {
        const data = await res.json()
        const allEvidence = data.evidence || data
        if (Array.isArray(allEvidence)) {
          const map: Record<string, { id: string; title: string; status: string }[]> = {}
          for (const ev of allEvidence) {
            const ctrlId = ev.control_id || ''
            if (!map[ctrlId]) map[ctrlId] = []
            map[ctrlId].push({
              id: ev.id,
              title: ev.title || ev.name || 'Nachweis',
              status: ev.status || 'pending',
            })
          }
          setEvidenceMap(map)
        }
      }
    } catch {
      // Silently fail
    }
  }

  // Fetch controls from backend on mount
  useEffect(() => {
    const fetchControls = async () => {
      try {
        setLoading(true)
        const res = await fetch('/api/sdk/v1/compliance/controls')
        if (res.ok) {
          const data = await res.json()
          const backendControls = data.controls || data
          if (Array.isArray(backendControls) && backendControls.length > 0) {
            const mapped: SDKControl[] = backendControls.map((c: Record<string, unknown>) => ({
              id: (c.control_id || c.id) as string,
              name: (c.name || c.title || '') as string,
              description: (c.description || '') as string,
              type: ((c.type || c.control_type || 'TECHNICAL') as string).toUpperCase() as ControlType,
              category: (c.category || '') as string,
              implementationStatus: ((c.implementation_status || c.status || 'NOT_IMPLEMENTED') as string).toUpperCase() as ImplementationStatus,
              effectiveness: (c.effectiveness || 'LOW') as 'LOW' | 'MEDIUM' | 'HIGH',
              evidence: (c.evidence || []) as string[],
              owner: (c.owner || null) as string | null,
              dueDate: c.due_date ? new Date(c.due_date as string) : null,
            }))
            dispatch({ type: 'SET_STATE', payload: { controls: mapped } })
            setError(null)
            // Fetch evidence for all controls
            fetchEvidenceForControls(mapped.map(c => c.id))
            return
          }
        }
        loadFromTemplates()
      } catch {
        loadFromTemplates()
      } finally {
        setLoading(false)
      }
    }

    const loadFromTemplates = () => {
      if (state.controls.length > 0) return
      if (state.requirements.length === 0) return

      const relevantControls = controlTemplates.filter(c =>
        c.linkedRequirements.some(reqId => state.requirements.some(r => r.id === reqId))
      )

      relevantControls.forEach(ctrl => {
        const sdkControl: SDKControl = {
          id: ctrl.id,
          name: ctrl.name,
          description: ctrl.description,
          type: ctrl.type,
          category: ctrl.category,
          implementationStatus: 'NOT_IMPLEMENTED',
          effectiveness: 'LOW',
          evidence: [],
          owner: ctrl.owner,
          dueDate: null,
        }
        dispatch({ type: 'ADD_CONTROL', payload: sdkControl })
      })
    }

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

  // Convert SDK controls to display controls
  const displayControls: DisplayControl[] = state.controls.map(ctrl => {
    const template = controlTemplates.find(t => t.id === ctrl.id)
    const effectivenessPercent = effectivenessMap[ctrl.id] ??
      (ctrl.implementationStatus === 'IMPLEMENTED' ? 85 :
       ctrl.implementationStatus === 'PARTIAL' ? 50 : 0)

    return {
      id: ctrl.id,
      name: ctrl.name,
      description: ctrl.description,
      type: ctrl.type,
      category: ctrl.category,
      implementationStatus: ctrl.implementationStatus,
      evidence: ctrl.evidence,
      owner: ctrl.owner,
      dueDate: ctrl.dueDate,
      code: template?.code || ctrl.id,
      displayType: template?.displayType || 'preventive',
      displayCategory: mapControlTypeToDisplay(ctrl.type),
      displayStatus: mapStatusToDisplay(ctrl.implementationStatus),
      effectivenessPercent,
      linkedRequirements: template?.linkedRequirements || [],
      linkedEvidence: evidenceMap[ctrl.id] || [],
      lastReview: new Date(),
    }
  })

  const filteredControls = filter === 'all'
    ? displayControls
    : displayControls.filter(c =>
        c.displayStatus === filter ||
        c.displayType === filter ||
        c.displayCategory === filter
      )

  const implementedCount = displayControls.filter(c => c.displayStatus === 'implemented').length
  const avgEffectiveness = displayControls.length > 0
    ? Math.round(displayControls.reduce((sum, c) => sum + c.effectivenessPercent, 0) / displayControls.length)
    : 0
  const partialCount = displayControls.filter(c => c.displayStatus === 'partial').length

  const handleStatusChange = async (controlId: string, status: ImplementationStatus) => {
    dispatch({
      type: 'UPDATE_CONTROL',
      payload: { id: controlId, data: { implementationStatus: status } },
    })

    try {
      await fetch(`/api/sdk/v1/compliance/controls/${controlId}`, {
        method: 'PUT',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ implementation_status: status }),
      })
    } catch {
      // Silently fail — SDK state is already updated
    }
  }

  const handleEffectivenessChange = async (controlId: string, effectiveness: number) => {
    setEffectivenessMap(prev => ({ ...prev, [controlId]: effectiveness }))

    // Persist to backend
    try {
      await fetch(`/api/sdk/v1/compliance/controls/${controlId}`, {
        method: 'PUT',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ effectiveness_score: effectiveness }),
      })
    } catch {
      // Silently fail — local state is already updated
    }
  }

  const handleAddControl = (data: { name: string; description: string; type: ControlType; category: string; owner: string }) => {
    const newControl: SDKControl = {
      id: `ctrl-${Date.now()}`,
      name: data.name,
      description: data.description,
      type: data.type,
      category: data.category,
      implementationStatus: 'NOT_IMPLEMENTED',
      effectiveness: 'LOW',
      evidence: [],
      owner: data.owner || null,
      dueDate: null,
    }
    dispatch({ type: 'ADD_CONTROL', payload: newControl })
    setShowAddForm(false)
  }

  const suggestControlsFromRAG = async () => {
    if (!selectedRequirementId) {
      setError('Bitte eine Anforderungs-ID eingeben.')
      return
    }
    setRagLoading(true)
    setRagSuggestions([])
    try {
      const res = await fetch('/api/sdk/v1/compliance/ai/suggest-controls', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ requirement_id: selectedRequirementId }),
      })
      if (!res.ok) {
        const msg = await res.text()
        throw new Error(msg || `HTTP ${res.status}`)
      }
      const data = await res.json()
      setRagSuggestions(data.suggestions || [])
      setShowRagPanel(true)
    } catch (e) {
      setError(`KI-Vorschläge fehlgeschlagen: ${e instanceof Error ? e.message : 'Unbekannter Fehler'}`)
    } finally {
      setRagLoading(false)
    }
  }

  const addSuggestedControl = (suggestion: RAGControlSuggestion) => {
    const newControl: import('@/lib/sdk').Control = {
      id: `rag-${suggestion.control_id}-${Date.now()}`,
      name: suggestion.title,
      description: suggestion.description,
      type: 'TECHNICAL',
      category: suggestion.domain,
      implementationStatus: 'NOT_IMPLEMENTED',
      effectiveness: 'LOW',
      evidence: [],
      owner: null,
      dueDate: null,
    }
    dispatch({ type: 'ADD_CONTROL', payload: newControl })
    // Remove from suggestions after adding
    setRagSuggestions(prev => prev.filter(s => s.control_id !== suggestion.control_id))
  }

  const stepInfo = STEP_EXPLANATIONS['controls']

  return (
    <div className="space-y-6">
      {/* Step Header */}
      <StepHeader
        stepId="controls"
        title={stepInfo.title}
        description={stepInfo.description}
        explanation={stepInfo.explanation}
        tips={stepInfo.tips}
      >
        <div className="flex items-center gap-2">
          <button
            onClick={() => setShowRagPanel(!showRagPanel)}
            className="flex items-center gap-2 px-4 py-2 bg-purple-100 text-purple-700 rounded-lg hover:bg-purple-200 transition-colors border border-purple-200"
          >
            <svg className="w-5 h-5" 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-.548.547A3.374 3.374 0 0014 18.469V19a2 2 0 11-4 0v-.531c0-.895-.356-1.754-.988-2.386l-.548-.547z" />
            </svg>
            KI-Controls aus RAG
          </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>
            Kontrolle hinzufuegen
          </button>
        </div>
      </StepHeader>

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

      {/* RAG Controls Panel */}
      {showRagPanel && (
        <div className="bg-purple-50 border border-purple-200 rounded-xl p-6">
          <div className="flex items-start justify-between mb-4">
            <div>
              <h3 className="text-lg font-semibold text-purple-900">KI-Controls aus RAG vorschlagen</h3>
              <p className="text-sm text-purple-700 mt-1">
                Geben Sie eine Anforderungs-ID ein. Das KI-System analysiert die Anforderung mit Hilfe des RAG-Corpus
                und schlägt passende Controls vor.
              </p>
            </div>
            <button onClick={() => setShowRagPanel(false)} className="text-purple-400 hover:text-purple-600 ml-4">
              <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
              </svg>
            </button>
          </div>

          <div className="flex items-center gap-3 mb-4">
            <input
              type="text"
              value={selectedRequirementId}
              onChange={e => setSelectedRequirementId(e.target.value)}
              placeholder="Anforderungs-UUID eingeben..."
              className="flex-1 px-4 py-2 border border-purple-300 rounded-lg focus:ring-2 focus:ring-purple-500 focus:border-transparent bg-white"
            />
            {state.requirements.length > 0 && (
              <select
                value={selectedRequirementId}
                onChange={e => setSelectedRequirementId(e.target.value)}
                className="px-3 py-2 border border-purple-300 rounded-lg bg-white text-sm focus:ring-2 focus:ring-purple-500"
              >
                <option value="">Aus Liste wählen...</option>
                {state.requirements.slice(0, 20).map(r => (
                  <option key={r.id} value={r.id}>{r.id.substring(0, 8)}... — {r.title?.substring(0, 40)}</option>
                ))}
              </select>
            )}
            <button
              onClick={suggestControlsFromRAG}
              disabled={ragLoading || !selectedRequirementId}
              className={`flex items-center gap-2 px-5 py-2 rounded-lg font-medium transition-colors ${
                ragLoading || !selectedRequirementId
                  ? 'bg-gray-200 text-gray-400 cursor-not-allowed'
                  : 'bg-purple-600 text-white hover:bg-purple-700'
              }`}
            >
              {ragLoading ? (
                <>
                  <div className="w-4 h-4 border-2 border-white border-t-transparent rounded-full animate-spin" />
                  Analysiere...
                </>
              ) : (
                <>
                  <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M13 10V3L4 14h7v7l9-11h-7z" />
                  </svg>
                  Vorschläge generieren
                </>
              )}
            </button>
          </div>

          {/* Suggestions */}
          {ragSuggestions.length > 0 && (
            <div className="space-y-3">
              <h4 className="text-sm font-semibold text-purple-800">{ragSuggestions.length} Vorschläge gefunden:</h4>
              {ragSuggestions.map((suggestion) => (
                <div key={suggestion.control_id} className="bg-white border border-purple-200 rounded-lg p-4">
                  <div className="flex items-start justify-between gap-3">
                    <div className="flex-1">
                      <div className="flex items-center gap-2 mb-1">
                        <span className="px-2 py-0.5 text-xs bg-purple-100 text-purple-700 rounded font-mono">
                          {suggestion.control_id}
                        </span>
                        <span className="px-2 py-0.5 text-xs bg-gray-100 text-gray-600 rounded">
                          {suggestion.domain}
                        </span>
                        <span className="text-xs text-gray-500">
                          Konfidenz: {Math.round(suggestion.confidence_score * 100)}%
                        </span>
                      </div>
                      <h5 className="font-semibold text-gray-900">{suggestion.title}</h5>
                      <p className="text-sm text-gray-600 mt-1">{suggestion.description}</p>
                      {suggestion.pass_criteria && (
                        <p className="text-xs text-gray-500 mt-1">
                          <span className="font-medium">Erfolgskriterium:</span> {suggestion.pass_criteria}
                        </p>
                      )}
                      {suggestion.is_automated && (
                        <span className="mt-1 inline-block px-2 py-0.5 text-xs bg-green-100 text-green-700 rounded">
                          Automatisierbar {suggestion.automation_tool ? `(${suggestion.automation_tool})` : ''}
                        </span>
                      )}
                    </div>
                    <button
                      onClick={() => addSuggestedControl(suggestion)}
                      className="flex-shrink-0 flex items-center gap-1 px-3 py-1.5 bg-purple-600 text-white text-sm rounded-lg hover:bg-purple-700 transition-colors"
                    >
                      <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 4v16m8-8H4" />
                      </svg>
                      Hinzufügen
                    </button>
                  </div>
                </div>
              ))}
            </div>
          )}

          {!ragLoading && ragSuggestions.length === 0 && selectedRequirementId && (
            <p className="text-sm text-purple-600 italic">
              Klicken Sie auf &quot;Vorschläge generieren&quot;, um KI-Controls abzurufen.
            </p>
          )}
        </div>
      )}

      {/* 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>
      )}

      {/* Requirements Alert */}
      {state.requirements.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 Anforderungen definiert</h4>
              <p className="text-sm text-amber-700 mt-1">
                Bitte definieren Sie zuerst Anforderungen, um die zugehoerigen Kontrollen 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">{displayControls.length}</div>
        </div>
        <div className="bg-white rounded-xl border border-green-200 p-6">
          <div className="text-sm text-green-600">Implementiert</div>
          <div className="text-3xl font-bold text-green-600">{implementedCount}</div>
        </div>
        <div className="bg-white rounded-xl border border-purple-200 p-6">
          <div className="text-sm text-purple-600">Durchschn. Wirksamkeit</div>
          <div className="text-3xl font-bold text-purple-600">{avgEffectiveness}%</div>
        </div>
        <div className="bg-white rounded-xl border border-yellow-200 p-6">
          <div className="text-sm text-yellow-600">Teilweise</div>
          <div className="text-3xl font-bold text-yellow-600">{partialCount}</div>
        </div>
      </div>

      {/* Filter */}
      <div className="flex items-center gap-2 flex-wrap">
        <span className="text-sm text-gray-500">Filter:</span>
        {['all', 'implemented', 'partial', 'not-implemented', 'technical', 'organizational', 'preventive', 'detective'].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 === 'implemented' ? 'Implementiert' :
             f === 'partial' ? 'Teilweise' :
             f === 'not-implemented' ? 'Offen' :
             f === 'technical' ? 'Technisch' :
             f === 'organizational' ? 'Organisatorisch' :
             f === 'preventive' ? 'Praeventiv' : 'Detektiv'}
          </button>
        ))}
      </div>

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

      {/* Controls List */}
      {!loading && (
        <div className="space-y-4">
          {filteredControls.map(control => (
            <ControlCard
              key={control.id}
              control={control}
              onStatusChange={(status) => handleStatusChange(control.id, status)}
              onEffectivenessChange={(effectiveness) => handleEffectivenessChange(control.id, effectiveness)}
              onLinkEvidence={() => router.push(`/sdk/evidence?control_id=${control.id}`)}
            />
          ))}
        </div>
      )}

      {!loading && filteredControls.length === 0 && state.requirements.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 12l2 2 4-4m5.618-4.016A11.955 11.955 0 0112 2.944a11.955 11.955 0 01-8.618 3.04A12.02 12.02 0 003 9c0 5.591 3.824 10.29 9 11.622 5.176-1.332 9-6.03 9-11.622 0-1.042-.133-2.052-.382-3.016z" />
            </svg>
          </div>
          <h3 className="text-lg font-semibold text-gray-900">Keine Kontrollen gefunden</h3>
          <p className="mt-2 text-gray-500">Passen Sie den Filter an oder fuegen Sie neue Kontrollen hinzu.</p>
        </div>
      )}
    </div>
  )
}
