/**
 * Quiztech Assessment Interaction Script
 *
 * Handles AJAX submissions for pre-screening, answer auto-save,
 * and final assessment submission.
 */
(function($) {
    'use strict';

    $(function() {
        console.log('Assessment script loaded.');

        // Check if localized data is available
        if (typeof quiztech_assessment_vars === 'undefined') {
            console.error('Quiztech Assessment Error: Localized variables not found.');
            return;
        }

        var $prescreeningForm = $('#quiztech-prescreening-form');
        var $prescreeningSection = $('#quiztech-prescreening-section');
        var $assessmentSection = $('#quiztech-assessment-section');
        var $submitButton = $prescreeningForm.find('button[type="submit"]');
        var $formMessages = $('<div class="form-messages"></div>').insertBefore($submitButton); // Area for messages

        // --- Pre-Screening Form Handling ---
        $prescreeningForm.on('submit', function(event) {
            event.preventDefault(); // Stop traditional form submission

            $formMessages.empty().removeClass('error success'); // Clear previous messages
            $submitButton.prop('disabled', true).text('Submitting...'); // Disable button

            var formData = $(this).serialize(); // Get form data

            // Add required AJAX parameters
            formData += '&action=quiztech_submit_prescreening';
            formData += '&nonce=' + quiztech_assessment_vars.prescreening_nonce;
            formData += '&invitation_id=' + quiztech_assessment_vars.invitation_id;

            $.ajax({
                type: 'POST',
                url: quiztech_assessment_vars.ajax_url,
                data: formData,
                dataType: 'json', // Expect JSON response from server
                success: function(response) {
                    if (response.success) {
                        // Success! Hide pre-screening, show assessment
                        $formMessages.addClass('success').text(response.data.message || 'Success!'); // Show success message briefly
                        $prescreeningSection.slideUp();
                        $assessmentSection.slideDown();
                        // No need to re-enable button as the form is gone
                    } else {
                        // Handle WP JSON error
                        $formMessages.addClass('error').text(response.data.message || 'An error occurred.');
                        $submitButton.prop('disabled', false).text('Submit Pre-Screening & Start Assessment'); // Re-enable button
                    }
                },
                error: function(jqXHR, textStatus, errorThrown) {
                    // Handle general AJAX error
                    console.error("AJAX Error:", textStatus, errorThrown);
                    $formMessages.addClass('error').text('A network error occurred. Please try again.');
                    $submitButton.prop('disabled', false).text('Submit Pre-Screening & Start Assessment'); // Re-enable button
                }
            });
        });

        // --- Assessment Answer Auto-Save ---
        var $assessmentForm = $('#quiztech-assessment-form');
        var autoSaveTimeout; // To debounce requests

        // Target input/textarea/select elements within the assessment form for auto-save
        $assessmentForm.on('change blur', 'input, textarea, select', function() {
            clearTimeout(autoSaveTimeout); // Clear previous timeout if exists

            var $input = $(this);
            var $questionGroup = $input.closest('.question-group');
            var questionId = $questionGroup.data('question-id');
            var answer = $input.val();

            // Add a small visual indicator within the question group
            var $indicator = $questionGroup.find('.save-indicator');
            if ($indicator.length === 0) {
                $indicator = $('<span class="save-indicator" style="margin-left: 10px; font-size: 0.8em; color: grey;"></span>').appendTo($questionGroup.find('label:first'));
            }
            $indicator.text('Saving...');

            // Debounce the AJAX request slightly
            autoSaveTimeout = setTimeout(function() {
                $.ajax({
                    type: 'POST',
                    url: quiztech_assessment_vars.ajax_url,
                    data: {
                        action: 'quiztech_save_answer',
                        nonce: quiztech_assessment_vars.assessment_nonce, // Use the correct nonce
                        invitation_id: quiztech_assessment_vars.invitation_id,
                        question_id: questionId,
                        answer: answer
                    },
                    dataType: 'json',
                    success: function(response) {
                        if (response.success) {
                            $indicator.text('Saved ✓').css('color', 'green');
                            // Optionally fade out the indicator after a delay
                            setTimeout(function() { $indicator.fadeOut().remove(); }, 2000);
                        } else {
                            $indicator.text('Error!').css('color', 'red');
                            console.error("Auto-save error:", response.data.message);
                            // Consider more prominent error display if needed
                        }
                    },
                    error: function(jqXHR, textStatus, errorThrown) {
                        $indicator.text('Network Error!').css('color', 'red');
                        console.error("AJAX Error:", textStatus, errorThrown);
                    }
                });
            }, 500); // Wait 500ms after the last change/blur before sending
        });


        // --- Final Assessment Submission ---
        var $submitAssessmentButton = $('#quiztech-submit-assessment');
        var $assessmentFormMessages = $('<div class="form-messages"></div>').insertAfter($submitAssessmentButton); // Area for messages

        $submitAssessmentButton.on('click', function(event) {
            event.preventDefault(); // Stop traditional form submission (though AJAX auto-save handles data)

            if (!confirm('Are you sure you want to submit your assessment?')) {
                return; // User cancelled
            }

            $assessmentFormMessages.empty().removeClass('error success');
            $submitAssessmentButton.prop('disabled', true).text('Submitting...');

            $.ajax({
                type: 'POST',
                url: quiztech_assessment_vars.ajax_url,
                data: {
                    action: 'quiztech_submit_assessment',
                    nonce: quiztech_assessment_vars.assessment_nonce, // Reuse assessment nonce
                    invitation_id: quiztech_assessment_vars.invitation_id
                },
                dataType: 'json',
                success: function(response) {
                    if (response.success) {
                        // Success! Display message and potentially hide the form/button
                        $assessmentFormMessages.addClass('success').text(response.data.message || 'Assessment Submitted Successfully!');
                        $assessmentForm.hide(); // Hide the form after successful submission
                        // Optionally redirect: window.location.href = response.data.redirect_url;
                    } else {
                        $assessmentFormMessages.addClass('error').text(response.data.message || 'An error occurred during submission.');
                        $submitAssessmentButton.prop('disabled', false).text('Submit Assessment'); // Re-enable button
                    }
                },
                error: function(jqXHR, textStatus, errorThrown) {
                    console.error("AJAX Error:", textStatus, errorThrown);
                    $assessmentFormMessages.addClass('error').text('A network error occurred. Please try again.');
                    $submitAssessmentButton.prop('disabled', false).text('Submit Assessment'); // Re-enable button
                }
            });
        });

    }); // End document ready

})(jQuery);