// This file handles the logic for the questionnaire, including collecting additional participant information after the quiz.

const WEBHOOK_URL = "https://n8n.olehomelchenko.com/webhook/kse-research";

document.addEventListener('DOMContentLoaded', function() {
    const questionnaireForm = document.getElementById('questionnaire-form');

    questionnaireForm.addEventListener('submit', function(event) {
        event.preventDefault();
        
        // Form validation
        const age = document.getElementById('age').value;
        if (age < 0 || age > 120) {
            showError('Please enter a valid age between 0 and 120');
            return;
        }

        const participantData = {
            age: age,
            gender: document.getElementById('gender').value,
            education: document.getElementById('education').value,
            colorBlind: document.getElementById('color-blind').value,
            familiarity: document.getElementById('familiarity').value,
            englishLevel: document.getElementById('english-level').value,
            ukrainianLevel: document.getElementById('ukrainian-level').value,
            visualizationDifficulty: document.getElementById('visualization-difficulty').value,
            quizDifficulty: document.getElementById('quiz-difficulty').value,
            kseAffiliation: document.getElementById('kse-affiliation').value,
            comments: document.getElementById('comments').value
        };

        // Disable form while submitting
        const submitButton = document.querySelector('button[type="submit"]');
        submitButton.disabled = true;

        // Store participant data in local storage
        localStorage.setItem('participantData', JSON.stringify(participantData));

        // Retrieve existing quiz data
        const allQuizzes = JSON.parse(localStorage.getItem('allQuizzes') || '{}');
        const quizId = 'quiz';
        if (allQuizzes[quizId]) {
            allQuizzes[quizId].participantData = participantData;
            allQuizzes[quizId].iterationVersion = 'v2.0.0'; // Add semantic versioning
            localStorage.setItem('allQuizzes', JSON.stringify(allQuizzes));
        }

        // Combine quiz results and questionnaire data
        const combinedData = {
            allQuizzes: allQuizzes
        };

        // Send combined data to webhook
        fetch(WEBHOOK_URL, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify(allQuizzes)
        })
        .then(() => {
            alert('Анкету надіслано успішно');
            window.location.href = 'results.html';
        })
        .catch((error) => {
            console.error('Error sending data:', error);
            alert('Сталася помилка при надсиланні анкети');
            submitButton.disabled = false;
        });
    });

    function showError(message) {
        const errorDiv = document.getElementById('error-message');
        errorDiv.textContent = message;
        errorDiv.style.display = 'block';
    }
});