@extends('layouts.app')

@section('content')
  <div class="row justify-content-center">
    <div class="col-lg-8 col-md-10 col-sm-12">
      <div class="modern-card fade-in">
        <div class="text-center mb-4">
          <h1 class="quiz-title">
            <i class="fas fa-brain me-3"></i>
            {{ $quiz->name }}
          </h1>
          <p class="text-muted fs-5">Test your knowledge with these questions</p>
        </div>

        <!-- Timer Display -->
        <div id="countdown-timer" class="mb-4">
          <div class="d-flex align-items-center justify-content-center">
            <i class="fas fa-clock me-3"></i>
            <span id="timer" class="me-2">0</span>
            <span>seconds remaining</span>
          </div>
        </div>

        <!-- Question Display -->
        <div id="questionBox" class="mb-4">
          <div class="question-text" id="questionText">
            <!-- Question text will be inserted here -->
          </div>
        </div>

        <!-- Answer Form -->
        <form id="answerForm" method="POST"
          action="{{ route('quiz.submit', ['quizId' => $quiz->id, 'employeeQuiz' => $employeeQuiz]) }}" class="slide-in">
          @csrf
          <input type="hidden" name="answers[]" id="answers">

          <div id="optionsBox" class="mb-4">
            <!-- Options will be inserted here -->
          </div>

          <button type="submit" id="submitBtn" class="btn btn-primary btn-lg w-100"
            >
            <i class="fas fa-paper-plane me-2"></i>Submit Answer
          </button>
        </form>
      </div>
    </div>
  </div>




  <script>
    // All questions data fetched from the server
    const questions = @json($quiz->questions); // JSON data from the server
    let currentQuestionIndex = 0;
    let timeLimit = questions[currentQuestionIndex].time_limit;
    let timerInterval;
    let timeLeft = timeLimit;
    let answers = []; // This will hold all the answers




    document.addEventListener('contextmenu', function(event) {
      event.preventDefault(); // Prevent right-click
    });

    document.addEventListener('keydown', function(event) {
      if ((event.ctrlKey || event.metaKey) && (event.key === 'c' || event.key === 'x' || event.key === 'v')) {
        event.preventDefault();
      }
    });

    // Render the question and its options
    function renderQuestion() {
     
      const question = questions[currentQuestionIndex];

      // Update question text
      document.getElementById('questionText').textContent = question.question_text;

      // Clear previous options
      const optionsBox = document.getElementById('optionsBox');
      optionsBox.innerHTML = '';

      // Insert options with modern styling
      question.options.forEach((option, index) => {
        const id = 'opt-' + option.id;
        const letter = String.fromCharCode(65 + index); // A, B, C, D...

        optionsBox.innerHTML += `
                        <div class="option-item" onclick="selectOption('${id}')">
                            <div class="d-flex align-items-center">
                                <div class="me-3 fw-bold text-primary">${letter}.</div>
                                <div class="flex-grow-1">${option.option_text}</div>
                                <input type="radio" name="chosen" id="${id}" value="${option.id}" class="d-none">
                            </div>
                        </div>`;
      });

      // Start the timer for this question
      startTimer();
    }

    // Function to handle option selection
    function selectOption(optionId) {
      // Remove selected class from all options
      document.querySelectorAll('.option-item').forEach(item => {
        item.classList.remove('selected');
      });

      // Add selected class to clicked option
      const optionElement = document.getElementById(optionId).closest('.option-item');
      optionElement.classList.add('selected');

      // Check the radio button
      document.getElementById(optionId).checked = true;
    }

    // Timer function to countdown the time for the question
    function startTimer() {
      document.getElementById('timer').textContent = timeLeft;

      // Reset timer for current question
      clearInterval(timerInterval);
      timerInterval = setInterval(() => {
        if (timeLeft <= 0) {
          clearInterval(timerInterval);
          //  document.getElementById('answered_in_time').value = false;  // Indicating no answer within time limit


          moveToNextQuestion();
        } else {
          document.getElementById('timer').textContent = timeLeft;
          timeLeft--;
        }
      }, 1000);
    }

    // Move to the next question or finish the quiz
    // Store answers as an array of objects
    function moveToNextQuestion() {
       const selectedOption = document.querySelector('input[name="chosen"]:checked');
      
      if (!selectedOption) {
        answers.push({
          question_id: questions[currentQuestionIndex].id,
          selected_option_id: null, // No option selected
          answered_in_time: false
        });
      } else {
        answers.push({
          question_id: questions[currentQuestionIndex].id,
          selected_option_id: selectedOption.value,
          answered_in_time: true
        });
      }
    
      // Move to the next question
      currentQuestionIndex++;
      if (currentQuestionIndex < questions.length) {
        timeLimit = questions[currentQuestionIndex].time_limit;
        timeLeft = timeLimit;
        renderQuestion();
      } else {
        submitAllAnswers(); // Submit all answers after the last question
      }
    }

    // Function to submit all answers
    function submitAllAnswers() {
      document.getElementById('answers').value = JSON.stringify(answers); // Send the answers as a JSON string
      document.getElementById('answerForm').submit(); // Submit the form
    }

    // Handle manual submission if the user clicks submit before the time runs out
    document.getElementById('answerForm').addEventListener('submit', (e) => {
      e.preventDefault();
      moveToNextQuestion(); // Submit the current question’s answer and go to the next
    });

    // Start rendering the first question
    renderQuestion();

    // Check for browser compatibility
    var visibilityChange = "visibilitychange";
    var hidden = "hidden";


    // For older browser versions that may use prefixes
    if (typeof document.hidden !== "undefined") {
      visibilityChange = "visibilitychange";
      hidden = "hidden";
    } else if (typeof document.msHidden !== "undefined") {
      visibilityChange = "msvisibilitychange";
      hidden = "msHidden";
    } else if (typeof document.webkitHidden !== "undefined") {
      visibilityChange = "webkitvisibilitychange";
      hidden = "webkitHidden";
    }

    // Add an event listener for visibility changes
    document.addEventListener(visibilityChange, function() {
      if (document.hidden) {
        // The page has become hidden (user switched tabs)
        console.log("Tab is now hidden.");
        moveToNextQuestion();
      } else {
        // The page has become visible again (user returned to the tab)
        console.log("Tab is now visible.");
      }
    });
  </script>
@endsection