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

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

    $id = isset($_POST['id']) && is_numeric($_POST['id']) ? (int)$_POST['id'] : 0;

    if ($id <= 0) {
        echo json_encode(['success' => false, 'message' => 'ID non valido.']);
        exit;
    }

    $stmt = $pdo->prepare("SELECT COUNT(*) FROM scad_deadlines WHERE function_id = ?");
    $stmt->execute([$id]);
    $inUse = (int)$stmt->fetchColumn();

    if ($inUse > 0) {
        echo json_encode([
            'success' => false,
            'message' => "Impossibile eliminare: la funzione è utilizzata in $inUse scadenz" . ($inUse === 1 ? 'a' : 'e') . '.',
        ]);
        exit;
    }

    $pdo->prepare("DELETE FROM scad_functions WHERE id = ?")->execute([$id]);

    echo json_encode(['success' => true, 'message' => 'Funzione eliminata.']);
} catch (Exception $e) {
    echo json_encode(['success' => false, 'message' => 'Errore: ' . $e->getMessage()]);
}