<?php
require_once 'includes/config.php';
require_once 'includes/auth.php';
require_once 'includes/survey_functions.php';

// Prevent any output before JSON
error_reporting(0); // Temporarily disable error reporting
ini_set('display_errors', 0); // Don't display errors

header('Content-Type: application/json');

try {
    $auth = new Auth();
    if (!$auth->isLoggedIn()) {
        throw new Exception('Unauthorized');
    }

    $surveyManager = SurveyManager::getInstance();
    
    // Get and validate input
    $data = [
        'title' => trim($_POST['title'] ?? ''),
        'description' => trim($_POST['description'] ?? ''),
        'status' => $_POST['status'] ?? 'draft',
        'allow_multiple' => !empty($_POST['allow_multiple']),
        'allow_edit' => !empty($_POST['allow_edit']),
        'created_by' => $_SESSION['user_id']
    ];

    // Validate required fields
    if (empty($data['title'])) {
        throw new Exception('Survey title is required');
    }

    // Check if survey_id exists and is not empty
    $surveyId = isset($_POST['survey_id']) && !empty($_POST['survey_id']) ? 
                (int)$_POST['survey_id'] : null;

    // Create or update survey
    if ($surveyId) {
        $result = $surveyManager->updateSurvey($surveyId, $data);
    } else {
        $result = $surveyManager->createSurvey($data);
        // Get the new survey ID if available
        $surveyId = isset($result['survey_id']) ? $result['survey_id'] : null;
    }

    if (!$result['success']) {
        throw new Exception($result['error'] ?? 'Operation failed');
    }

    echo json_encode([
        'success' => true,
        'survey_id' => $surveyId,
        'message' => 'Survey saved successfully'
    ]);

} catch (Exception $e) {
    echo json_encode([
        'success' => false,
        'error' => $e->getMessage()
    ]);
}
?>