<?php
header('Content-Type: application/json');
require_once 'class/db-functions.php';

$response = ["success" => false, "columns" => []];

try {
    if (!isset($_GET['table']) || empty($_GET['table'])) {
        throw new Exception("Invalid table name.");
    }

    $table = preg_replace('/[^a-zA-Z0-9_]/', '', $_GET['table']); // Sanitize table name

    $db = DBHandlerSelect::getInstance();
    $pdo = $db->getConnection();

    // Retrieve table columns
    $stmt = $pdo->query("SHOW COLUMNS FROM `$table`");
    $columns = $stmt->fetchAll(PDO::FETCH_COLUMN);

    if (!$columns) {
        throw new Exception("No columns found in table.");
    }

    $response["success"] = true;
    $response["columns"] = $columns;
} catch (Exception $e) {
    $response["message"] = $e->getMessage();
}

// Log per debugging
error_log(json_encode($response));

// Restituisce la risposta JSON
echo json_encode($response);