'use client'

import type { TrainingAssignment, QuizSubmitResponse } from '@/lib/sdk/training/types'

interface QuizQuestion {
  id: string
  question: string
  options: string[]
  difficulty: string
}

function formatTimer(seconds: number): string {
  const m = Math.floor(seconds / 60)
  const s = seconds % 60
  return `${m}:${s.toString().padStart(2, '0')}`
}

interface QuizViewProps {
  questions: QuizQuestion[]
  answers: Record<string, number>
  quizResult: QuizSubmitResponse | null
  quizSubmitting: boolean
  quizTimer: number
  selectedAssignment: TrainingAssignment | null
  certGenerating: boolean
  onAnswerChange: (questionId: string, optionIndex: number) => void
  onSubmitQuiz: () => void
  onRetryQuiz: () => void
  onGenerateCertificate: (assignmentId: string) => void
}

export function QuizView({
  questions, answers, quizResult, quizSubmitting, quizTimer,
  selectedAssignment, certGenerating, onAnswerChange, onSubmitQuiz, onRetryQuiz, onGenerateCertificate,
}: QuizViewProps) {
  if (questions.length === 0) {
    return <div className="text-center py-12 text-gray-400">Starten Sie ein Quiz aus dem Schulungsinhalt-Tab</div>
  }

  if (quizResult) {
    return (
      <div className="max-w-lg mx-auto">
        <div className={`text-center p-8 rounded-lg border-2 ${quizResult.passed ? 'border-green-300 bg-green-50' : 'border-red-300 bg-red-50'}`}>
          <div className="text-4xl mb-3">{quizResult.passed ? '\u2705' : '\u274C'}</div>
          <h2 className="text-2xl font-bold mb-2">{quizResult.passed ? 'Bestanden!' : 'Nicht bestanden'}</h2>
          <p className="text-lg text-gray-700">{quizResult.correct_count} von {quizResult.total_count} richtig ({Math.round(quizResult.score)}%)</p>
          <p className="text-sm text-gray-500 mt-1">Bestehensgrenze: {quizResult.threshold}% | Zeit: {formatTimer(quizTimer)}</p>
          {quizResult.passed && selectedAssignment && !selectedAssignment.certificate_id && (
            <button onClick={() => onGenerateCertificate(selectedAssignment.id)} disabled={certGenerating}
              className="mt-4 px-6 py-2 bg-green-600 text-white rounded-lg hover:bg-green-700 disabled:opacity-50">
              {certGenerating ? 'Erstelle Zertifikat...' : 'Zertifikat generieren & herunterladen'}
            </button>
          )}
          {!quizResult.passed && (
            <button onClick={onRetryQuiz} className="mt-4 px-6 py-2 bg-indigo-600 text-white rounded-lg hover:bg-indigo-700">
              Quiz erneut versuchen
            </button>
          )}
        </div>
      </div>
    )
  }

  return (
    <div>
      <div className="flex items-center justify-between mb-4">
        <h2 className="text-lg font-semibold">Quiz — {selectedAssignment?.module_title}</h2>
        <span className="text-sm text-gray-500 font-mono bg-gray-100 px-3 py-1 rounded">{formatTimer(quizTimer)}</span>
      </div>
      <div className="space-y-6">
        {questions.map((q, idx) => (
          <div key={q.id} className="bg-white border border-gray-200 rounded-lg p-5">
            <p className="font-medium text-gray-900 mb-3">
              <span className="text-indigo-600 mr-2">Frage {idx + 1}.</span>{q.question}
            </p>
            <div className="space-y-2">
              {q.options.map((opt, oi) => (
                <label key={oi} className={`flex items-center gap-3 p-3 rounded-lg border cursor-pointer transition-colors ${
                  answers[q.id] === oi ? 'border-indigo-500 bg-indigo-50' : 'border-gray-200 hover:bg-gray-50'
                }`}>
                  <input type="radio" name={q.id} checked={answers[q.id] === oi}
                    onChange={() => onAnswerChange(q.id, oi)} className="text-indigo-600" />
                  <span className="text-sm text-gray-700">{opt}</span>
                </label>
              ))}
            </div>
          </div>
        ))}
      </div>
      <div className="mt-6 flex justify-end">
        <button onClick={onSubmitQuiz} disabled={quizSubmitting || Object.keys(answers).length < questions.length}
          className="px-6 py-2 bg-indigo-600 text-white rounded-lg hover:bg-indigo-700 disabled:opacity-50">
          {quizSubmitting ? 'Wird ausgewertet...' : `Quiz abgeben (${Object.keys(answers).length}/${questions.length})`}
        </button>
      </div>
    </div>
  )
}