<?php

require_once __DIR__ . '/auth_check.php';

mnt_require_permission('maintenance.manage');

try {
    $pdo = mnt_pdo();

    $id = (int)($_POST['id'] ?? 0);

    if ($id <= 0) {
        mnt_json_fail('ID non valido.');
    }

    // The FK is ON DELETE SET NULL, so a delete would silently orphan items:
    // refuse while the category is still in use.
    $stmt = $pdo->prepare("SELECT COUNT(*) FROM inv_equipment WHERE category_id = ?");
    $stmt->execute([$id]);
    $inUse = (int)$stmt->fetchColumn();

    if ($inUse > 0) {
        mnt_json_fail('Impossibile eliminare: la categoria è usata da ' . $inUse . ' attrezzature.');
    }

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

    mnt_json_ok();
} catch (Throwable $e) {
    mnt_json_fail('Errore: ' . $e->getMessage());
}