<?php
require_once __DIR__ . '/include/headscript.php'; // o il tuo bootstrap standard

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

try {
    if (!isset($_GET['iddatadb']) || !is_numeric($_GET['iddatadb'])) {
        echo json_encode(['success' => true, 'field' => null]);
        exit;
    }

    $iddatadb = (int)$_GET['iddatadb'];

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

    // 1) prendo templateid da datadb
    // 2) cerco max 1 record in template_mapping con is_visible_parts=1
    $sql = "
        SELECT tm.field_id, tm.field_label, tm.data_type, tm.has_list
        FROM datadb d
        JOIN template_mapping tm ON tm.template_id = d.templateid
        WHERE d.iddatadb = ?
          AND tm.is_visible_parts = 1
        ORDER BY tm.id ASC
        LIMIT 1
    ";
    $stmt = $pdo->prepare($sql);
    $stmt->execute([$iddatadb]);
    $row = $stmt->fetch(PDO::FETCH_ASSOC);

    echo json_encode([
        'success' => true,
        'field' => $row ? $row : null
    ]);
} catch (Throwable $e) {
    echo json_encode(['success' => false, 'message' => $e->getMessage()]);
}