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

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

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

    // Get and validate input
    $input = json_decode(file_get_contents('php://input'), true);
    if (!isset($input['survey_id'])) {
        throw new Exception('Survey ID is required');
    }

    $surveyManager = SurveyManager::getInstance();
    $result = $surveyManager->deleteSurvey($input['survey_id'], $_SESSION['user_id']);

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

    echo json_encode([
        'success' => true,
        'message' => 'Survey deleted successfully'
    ]);

} catch (Exception $e) {
    http_response_code(500);
    echo json_encode([
        'success' => false,
        'error' => $e->getMessage()
    ]);
}
?>