'use client'

import { useState } from 'react'
import AdminLayout from '@/components/admin/AdminLayout'
import {
  WizardStepper,
  WizardNavigation,
  EducationCard,
  ArchitectureContext,
  TestRunner,
  TestSummary,
  type WizardStep,
  type TestCategoryResult,
  type FullTestResults,
  type EducationContent,
  type ArchitectureContextType,
} from '@/components/wizard'

// ==============================================
// Constants
// ==============================================

const BACKEND_URL = process.env.NEXT_PUBLIC_BACKEND_URL || 'http://localhost:8000'

const STEPS: WizardStep[] = [
  { id: 'welcome', name: 'Willkommen', icon: '👋', status: 'pending' },
  { id: 'api-health', name: 'API Status', icon: '💚', status: 'pending', category: 'api-health' },
  { id: 'matrix', name: 'Matrix', icon: '💬', status: 'pending', category: 'matrix' },
  { id: 'jitsi', name: 'Jitsi', icon: '📹', status: 'pending', category: 'jitsi' },
  { id: 'summary', name: 'Zusammenfassung', icon: '📊', status: 'pending' },
]

const EDUCATION_CONTENT: Record<string, EducationContent> = {
  'welcome': {
    title: 'Willkommen zum Communication Wizard',
    content: [
      'Sichere Kommunikation ist das Rueckgrat moderner Bildungsplattformen.',
      '',
      'BreakPilot nutzt zwei Open-Source Systeme:',
      '• Matrix Synapse: Dezentraler Messenger (Ende-zu-Ende verschluesselt)',
      '• Jitsi Meet: Video-Konferenzen (WebRTC-basiert)',
      '',
      'Beide Systeme sind DSGVO-konform und self-hosted.',
      '',
      'In diesem Wizard testen wir:',
      '• Matrix Homeserver und Federation',
      '• Jitsi Video-Konferenz Server',
      '• Integration mit der Schulverwaltung',
    ],
  },
  'api-health': {
    title: 'Communication API - Backend Integration',
    content: [
      'Die Communication API verbindet Matrix und Jitsi mit BreakPilot.',
      '',
      'Funktionen:',
      '• Automatische Raum-Erstellung fuer Klassen',
      '• Eltern-Lehrer DM-Raeume',
      '• Meeting-Planung mit Kalender-Integration',
      '• Benachrichtigungen bei neuen Nachrichten',
      '',
      'Endpunkte:',
      '• /api/v1/communication/admin/stats',
      '• /api/v1/communication/admin/matrix/users',
      '• /api/v1/communication/rooms',
    ],
  },
  'matrix': {
    title: 'Matrix Synapse - Dezentraler Messenger',
    content: [
      'Matrix ist ein offenes Protokoll fuer sichere Kommunikation.',
      '',
      'Vorteile gegenueber WhatsApp/Teams:',
      '• Ende-zu-Ende Verschluesselung (E2EE)',
      '• Dezentral: Kein Single Point of Failure',
      '• Federation: Kommunikation mit anderen Schulen',
      '• Self-Hosted: Volle Datenkontrolle',
      '',
      'Raum-Typen in BreakPilot:',
      '• Klassen-Info (Ankuendigungen)',
      '• Elternvertreter-Raum',
      '• Lehrer-Eltern DM',
      '• Fachgruppen',
    ],
  },
  'jitsi': {
    title: 'Jitsi Meet - Video-Konferenzen',
    content: [
      'Jitsi ist eine Open-Source Alternative zu Zoom/Teams.',
      '',
      'Features:',
      '• WebRTC: Keine Software-Installation noetig',
      '• Bildschirmfreigabe und Whiteboard',
      '• Breakout-Raeume fuer Gruppenarbeit',
      '• Aufzeichnung (optional, lokal)',
      '',
      'Anwendungsfaelle:',
      '• Elternsprechtage (online)',
      '• Fernunterricht bei Schulausfall',
      '• Lehrerkonferenzen',
      '• Foerdergespraeche',
    ],
  },
  'summary': {
    title: 'Test-Zusammenfassung',
    content: [
      'Hier sehen Sie eine Uebersicht aller durchgefuehrten Tests:',
      '• Matrix Homeserver Verfuegbarkeit',
      '• Jitsi Server Status',
      '• API-Integration',
    ],
  },
}

const ARCHITECTURE_CONTEXTS: Record<string, ArchitectureContextType> = {
  'api-health': {
    layer: 'api',
    services: ['backend', 'consent-service'],
    dependencies: ['PostgreSQL', 'Matrix Synapse', 'Jitsi'],
    dataFlow: ['Browser', 'FastAPI', 'Go Service', 'Matrix/Jitsi'],
  },
  'matrix': {
    layer: 'service',
    services: ['matrix'],
    dependencies: ['PostgreSQL', 'Federation', 'TURN Server'],
    dataFlow: ['Element Client', 'Matrix Synapse', 'Federation', 'PostgreSQL'],
  },
  'jitsi': {
    layer: 'service',
    services: ['jitsi'],
    dependencies: ['Prosody XMPP', 'JVB', 'TURN/STUN'],
    dataFlow: ['Browser', 'Nginx', 'Prosody', 'Jitsi Videobridge'],
  },
}

// ==============================================
// Main Component
// ==============================================

export default function CommunicationWizardPage() {
  const [currentStep, setCurrentStep] = useState(0)
  const [steps, setSteps] = useState<WizardStep[]>(STEPS)
  const [categoryResults, setCategoryResults] = useState<Record<string, TestCategoryResult>>({})
  const [fullResults, setFullResults] = useState<FullTestResults | null>(null)
  const [isLoading, setIsLoading] = useState(false)
  const [error, setError] = useState<string | null>(null)

  const currentStepData = steps[currentStep]
  const isTestStep = currentStepData?.category !== undefined
  const isWelcome = currentStepData?.id === 'welcome'
  const isSummary = currentStepData?.id === 'summary'

  const runCategoryTest = async (category: string) => {
    setIsLoading(true)
    setError(null)

    try {
      const response = await fetch(`${BACKEND_URL}/api/admin/communication-tests/${category}`, {
        method: 'POST',
      })

      if (!response.ok) {
        throw new Error(`HTTP ${response.status}: ${response.statusText}`)
      }

      const result: TestCategoryResult = await response.json()
      setCategoryResults((prev) => ({ ...prev, [category]: result }))

      setSteps((prev) =>
        prev.map((step) =>
          step.category === category
            ? { ...step, status: result.failed === 0 ? 'completed' : 'failed' }
            : step
        )
      )
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Unbekannter Fehler')
    } finally {
      setIsLoading(false)
    }
  }

  const runAllTests = async () => {
    setIsLoading(true)
    setError(null)

    try {
      const response = await fetch(`${BACKEND_URL}/api/admin/communication-tests/run-all`, {
        method: 'POST',
      })

      if (!response.ok) {
        throw new Error(`HTTP ${response.status}: ${response.statusText}`)
      }

      const results: FullTestResults = await response.json()
      setFullResults(results)

      setSteps((prev) =>
        prev.map((step) => {
          if (step.category) {
            const catResult = results.categories.find((c) => c.category === step.category)
            if (catResult) {
              return { ...step, status: catResult.failed === 0 ? 'completed' : 'failed' }
            }
          }
          return step
        })
      )

      const newCategoryResults: Record<string, TestCategoryResult> = {}
      results.categories.forEach((cat) => {
        newCategoryResults[cat.category] = cat
      })
      setCategoryResults(newCategoryResults)
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Unbekannter Fehler')
    } finally {
      setIsLoading(false)
    }
  }

  const goToNext = () => {
    if (currentStep < steps.length - 1) {
      setSteps((prev) =>
        prev.map((step, idx) =>
          idx === currentStep && step.status === 'pending'
            ? { ...step, status: 'completed' }
            : step
        )
      )
      setCurrentStep((prev) => prev + 1)
    }
  }

  const goToPrev = () => {
    if (currentStep > 0) {
      setCurrentStep((prev) => prev - 1)
    }
  }

  const handleStepClick = (index: number) => {
    if (index <= currentStep || steps[index - 1]?.status !== 'pending') {
      setCurrentStep(index)
    }
  }

  return (
    <AdminLayout
      title="Communication Wizard"
      description="Interaktives Lernen und Testen der Matrix & Jitsi Integration"
    >
      {/* Header */}
      <div className="bg-white rounded-lg shadow p-4 mb-6 flex items-center justify-between">
        <div className="flex items-center">
          <span className="text-3xl mr-3">💬</span>
          <div>
            <h2 className="text-lg font-bold text-gray-800">Communication Test Wizard</h2>
            <p className="text-sm text-gray-600">Matrix Messenger & Jitsi Video</p>
          </div>
        </div>
        <a href="/admin/communication" className="text-blue-600 hover:text-blue-800 text-sm">
          &larr; Zurueck zu Communication
        </a>
      </div>

      {/* Stepper */}
      <div className="bg-white rounded-lg shadow p-6 mb-6">
        <WizardStepper steps={steps} currentStep={currentStep} onStepClick={handleStepClick} />
      </div>

      {/* Content */}
      <div className="bg-white rounded-lg shadow p-6">
        <div className="flex items-center mb-6">
          <span className="text-3xl mr-3">{currentStepData?.icon}</span>
          <div>
            <h2 className="text-xl font-bold text-gray-800">
              Schritt {currentStep + 1}: {currentStepData?.name}
            </h2>
            <p className="text-gray-500 text-sm">
              {currentStep + 1} von {steps.length}
            </p>
          </div>
        </div>

        <EducationCard content={EDUCATION_CONTENT[currentStepData?.id || '']} />

        {isTestStep && currentStepData?.category && ARCHITECTURE_CONTEXTS[currentStepData.category] && (
          <ArchitectureContext
            context={ARCHITECTURE_CONTEXTS[currentStepData.category]}
            currentStep={currentStepData.name}
          />
        )}

        {error && (
          <div className="bg-red-50 border border-red-200 text-red-700 rounded-lg p-4 mb-6">
            <strong>Fehler:</strong> {error}
          </div>
        )}

        {isWelcome && (
          <div className="text-center py-8">
            <button
              onClick={goToNext}
              className="bg-blue-600 text-white px-8 py-3 rounded-lg font-medium hover:bg-blue-700 transition-colors"
            >
              Wizard starten
            </button>
          </div>
        )}

        {isTestStep && currentStepData?.category && (
          <TestRunner
            category={currentStepData.category}
            categoryResult={categoryResults[currentStepData.category]}
            isLoading={isLoading}
            onRunTests={() => runCategoryTest(currentStepData.category!)}
          />
        )}

        {isSummary && (
          <div>
            {!fullResults ? (
              <div className="text-center py-8">
                <p className="text-gray-600 mb-4">
                  Fuehren Sie alle Tests aus um eine Zusammenfassung zu sehen.
                </p>
                <button
                  onClick={runAllTests}
                  disabled={isLoading}
                  className={`px-6 py-3 rounded-lg font-medium transition-colors ${
                    isLoading
                      ? 'bg-gray-400 cursor-not-allowed'
                      : 'bg-blue-600 text-white hover:bg-blue-700'
                  }`}
                >
                  {isLoading ? 'Alle Tests laufen...' : 'Alle Tests ausfuehren'}
                </button>
              </div>
            ) : (
              <TestSummary results={fullResults} />
            )}
          </div>
        )}

        <WizardNavigation
          currentStep={currentStep}
          totalSteps={steps.length}
          onPrev={goToPrev}
          onNext={goToNext}
          showNext={!isSummary}
          isLoading={isLoading}
        />
      </div>

      <div className="text-center text-gray-500 text-sm mt-6">
        Diese Tests pruefen die Matrix- und Jitsi-Integration.
        Bei Fragen wenden Sie sich an das IT-Team.
      </div>
    </AdminLayout>
  )
}