'use client'

import React from 'react'
import {
  AIUseCaseModule,
  AIActRiskClass,
  AI_ACT_RISK_CLASSES,
} from '@/lib/sdk/dsfa/ai-use-case-types'
import { Art22AssessmentPanel } from './Art22AssessmentPanel'
import { AIRiskCriteriaChecklist } from './AIRiskCriteriaChecklist'
import { LEGAL_BASES } from './AIUseCaseEditorConstants'

type UpdateFn = (updates: Partial<AIUseCaseModule>) => void

// =============================================================================
// TAB 3: Zweck & Art. 22
// =============================================================================

interface Tab3PurposeProps {
  module: AIUseCaseModule
  update: UpdateFn
  art22Required: boolean
}

export function Tab3Purpose({ module, update, art22Required }: Tab3PurposeProps) {
  return (
    <div className="space-y-4">
      <div>
        <label className="block text-sm font-medium text-gray-700 mb-1">Verarbeitungszweck *</label>
        <textarea
          value={module.processing_purpose}
          onChange={e => update({ processing_purpose: e.target.value })}
          rows={3}
          placeholder="Welchem Zweck dient dieses KI-System? Was soll erreicht werden?"
          className="w-full px-3 py-2 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 resize-none"
        />
      </div>
      <div>
        <label className="block text-sm font-medium text-gray-700 mb-1">Rechtsgrundlage *</label>
        <select
          value={module.legal_basis}
          onChange={e => update({ legal_basis: e.target.value })}
          className="w-full px-3 py-2 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500"
        >
          <option value="">Bitte wählen...</option>
          {LEGAL_BASES.map(lb => (
            <option key={lb} value={lb}>{lb}</option>
          ))}
        </select>
      </div>
      {module.legal_basis && (
        <div>
          <label className="block text-sm font-medium text-gray-700 mb-1">Details zur Rechtsgrundlage</label>
          <textarea
            value={module.legal_basis_details || ''}
            onChange={e => update({ legal_basis_details: e.target.value })}
            rows={2}
            placeholder="Ergänzende Erläuterung zur Rechtsgrundlage..."
            className="w-full px-3 py-2 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 resize-none"
          />
        </div>
      )}
      <div className="border-t border-gray-200 pt-4">
        <h4 className="text-sm font-semibold text-gray-900 mb-3">
          Art. 22 DSGVO – Automatisierte Einzelentscheidung
          {art22Required && (
            <span className="ml-2 text-xs px-1.5 py-0.5 bg-red-100 text-red-700 rounded">
              Wahrscheinlich anwendbar
            </span>
          )}
        </h4>
        <Art22AssessmentPanel
          assessment={module.art22_assessment}
          onChange={a22 => update({ art22_assessment: a22 })}
        />
      </div>
    </div>
  )
}

// =============================================================================
// TAB 4: KI-Kriterien & AI Act
// =============================================================================

interface Tab4AIActProps {
  module: AIUseCaseModule
  update: UpdateFn
}

export function Tab4AIAct({ module, update }: Tab4AIActProps) {
  return (
    <div className="space-y-6">
      <div>
        <h4 className="text-sm font-semibold text-gray-900 mb-3">WP248-Risikokriterien</h4>
        <AIRiskCriteriaChecklist
          criteria={module.risk_criteria}
          onChange={criteria => update({ risk_criteria: criteria })}
        />
      </div>
      <div className="border-t border-gray-200 pt-4">
        <h4 className="text-sm font-semibold text-gray-900 mb-3">EU AI Act – Risikoklasse</h4>
        <div className="grid grid-cols-2 gap-3">
          {(Object.entries(AI_ACT_RISK_CLASSES) as [AIActRiskClass, typeof AI_ACT_RISK_CLASSES[AIActRiskClass]][]).map(([cls, info]) => (
            <button
              key={cls}
              onClick={() => update({ ai_act_risk_class: cls })}
              className={`p-3 rounded-xl border-2 text-left transition-all ${
                module.ai_act_risk_class === cls
                  ? cls === 'unacceptable' ? 'border-red-500 bg-red-50'
                    : cls === 'high_risk' ? 'border-orange-500 bg-orange-50'
                    : cls === 'limited' ? 'border-yellow-500 bg-yellow-50'
                    : 'border-green-500 bg-green-50'
                  : 'border-gray-200 bg-white hover:border-gray-300'
              }`}
            >
              <div className="font-medium text-sm text-gray-900">{info.labelDE}</div>
              <p className="text-xs text-gray-500 mt-0.5 line-clamp-2">{info.description}</p>
            </button>
          ))}
        </div>
        {module.ai_act_risk_class && (
          <div className="mt-3">
            <label className="block text-sm font-medium text-gray-700 mb-1">Begründung der Klassifizierung</label>
            <textarea
              value={module.ai_act_justification || ''}
              onChange={e => update({ ai_act_justification: e.target.value })}
              rows={2}
              placeholder="Warum wurde diese Risikoklasse gewählt?"
              className="w-full px-3 py-2 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 resize-none"
            />
          </div>
        )}
        {module.ai_act_risk_class && AI_ACT_RISK_CLASSES[module.ai_act_risk_class].requirements.length > 0 && (
          <div className="mt-3 p-3 bg-gray-50 rounded-lg">
            <div className="text-xs font-medium text-gray-700 mb-2">Anforderungen dieser Klasse:</div>
            <ul className="space-y-1">
              {AI_ACT_RISK_CLASSES[module.ai_act_risk_class].requirements.map((req, i) => (
                <li key={i} className="text-xs text-gray-600 flex items-start gap-1.5">
                  <span className="text-purple-500 flex-shrink-0">•</span>
                  {req}
                </li>
              ))}
            </ul>
          </div>
        )}
      </div>
    </div>
  )
}