function mk_book_get_or_create_completed_order($user, $email, $first, $source) {
    $order = mk_book_find_order($user->ID, $email);
    if ($order) {
        return mk_book_ensure_completed($order);
    }

    $product = wc_get_product(MK_BOOK_PRODUCT_ID);
    if (!$product) {
        return new WP_Error('mk_no_product', 'Product not found.', ['status' => 404]);
    }

    $order = wc_create_order([
        'customer_id' => $user->ID,
        'status' => 'pending',
    ]);

    if (!$order || is_wp_error($order)) {
        return new WP_Error('mk_order', 'Order create failed.', ['status' => 500]);
    }

    $order->add_product($product, 1);
    $order->set_billing_first_name($first ?: $user->first_name);
    $order->set_billing_email($email);
    $order->set_payment_method('mk_free_book');
    $order->set_payment_method_title('MK free book');
    $order->set_transaction_id('MKBOOK-' . $user->ID . '-' . time());
    $order->set_date_paid(current_time('mysql'));
    $order->add_order_note('Book access. Source: ' . $source);
    $order->calculate_totals();
    $order->save();

    return mk_book_ensure_completed($order);
}

function mk_book_ensure_completed($order) {
    $id = $order->get_id();

    if (!in_array($order->get_status(), ['completed', 'processing'], true)) {
        add_filter('pre_wp_mail', '__return_true', 99999);
        try {
            $txn = $order->get_transaction_id();
            if (!$txn) {
                $txn = 'MKBOOK-' . $id . '-' . time();
            }
            $order->payment_complete($txn);
        } catch (Throwable $e) {
            mk_book_log('PAYMENT_ERR ' . $e->getMessage());
            $order->set_status('completed');
            $order->save();
        }
        remove_filter('pre_wp_mail', '__return_true', 99999);
    }

    $order = wc_get_order($id);
    if (!$order) {
        return new WP_Error('mk_order_lost', 'Order lost.', ['status' => 500]);
    }

    if (!$order->get_downloadable_items()) {
        foreach ($order->get_items() as $item) {
            $product = $item->get_product();
            if ($product && $product->is_downloadable()) {
                foreach ($product->get_downloads() as $download_id => $file) {
                    if (function_exists('wc_downloadable_file_permission')) {
                        wc_downloadable_file_permission($download_id, $product, $order);
                    }
                }
            }
        }
        $order = wc_get_order($id);
    }

    return $order;
}

function mk_book_find_order($user_id, $email) {
    foreach ([['customer_id' => $user_id], ['billing_email' => $email]] as $q) {
        $ids = wc_get_orders(array_merge($q, [
            'status' => ['pending', 'processing', 'completed'],
            'limit' => 10,
            'return' => 'ids',
        ]));
        if (!is_array($ids)) {
            continue;
        }
        foreach ($ids as $id) {
            $o = wc_get_order((int) $id);
            if ($o && mk_book_order_has_product($o)) {
                return $o;
            }
        }
    }
    return false;
}

function mk_book_order_has_product($order) {
    foreach ($order->get_items() as $item) {
        if ((int) $item->get_product_id() === MK_BOOK_PRODUCT_ID) {
            return true;
        }
    }
    return false;
}

function mk_book_get_or_create_user($email, $first, $last) {
    $user = get_user_by('email', $email);
    if ($user) {
        if ($first && empty($user->first_name)) {
            wp_update_user(['ID' => $user->ID, 'first_name' => $first]);
        }
        if ($last && empty($user->last_name)) {
            wp_update_user(['ID' => $user->ID, 'last_name' => $last]);
        }
        if (!in_array('customer', (array) $user->roles, true) && !in_array('administrator', (array) $user->roles, true)) {
            $user->add_role('customer');
        }
        return $user;
    }

    $part = strtok($email, '@');
    $base = sanitize_user(is_string($part) ? $part : '', true);
    if (!$base) {
        $base = 'mkbook' . substr(md5($email), 0, 6);
    }

    $login = $base;
    $i = 1;
    while (username_exists($login)) {
        $login = $base . $i;
        $i++;
        if ($i > 50) {
            $login = $base . '_' . substr(md5($email . microtime()), 0, 8);
            break;
        }
    }

    $user_id = wp_insert_user([
        'user_login' => $login,
        'user_pass' => wp_generate_password(24, true, true),
        'user_email' => $email,
        'first_name' => $first,
        'last_name' => $last,
        'role' => 'customer',
    ]);

    if (is_wp_error($user_id)) {
        return $user_id;
    }

    return get_userdata($user_id);
}

function mk_book_schedule_bg($user_id, $order_id) {
    $user_id = (int) $user_id;
    $order_id = (int) $order_id;

    if (function_exists('as_schedule_single_action')) {
        as_schedule_single_action(time() + 5, MK_BOOK_BG, [$user_id, $order_id], 'mk-book');
        return;
    }

    if (!wp_next_scheduled(MK_BOOK_BG, [$user_id, $order_id])) {
        wp_schedule_single_event(time() + 5, MK_BOOK_BG, [$user_id, $order_id]);
    }
}

function mk_book_background_emails($user_id, $order_id) {
    $user = get_userdata((int) $user_id);
    $order = wc_get_order((int) $order_id);
    if (!$user || !$order) {
        return;
    }

    $items = $order->get_downloadable_items();
    $url = $items ? ($items[0]['download_url'] ?? '') : '';
    if (!$url) {
        return;
    }

    $name = trim($user->first_name . ' ' . $user->last_name);
    if ($name === '') {
        $name = $user->user_email;
    }

    $subject = 'Ваша книга: Введение в энерготерапию';
    $message = "Здравствуйте, {$name}!\n\nВаша книга «Введение в энерготерапию»:\n{$url}\n\nСсылка действует для вашего заказа.";
    $headers = ['Content-Type: text/plain; charset=UTF-8'];

    wp_mail($user->user_email, $subject, $message, $headers);
    mk_book_log('BG_MAIL_SENT order=' . $order_id);
}

function mk_book_search($data, array $keys, $depth = 0) {
    if ($depth > 5 || !is_array($data)) {
        return '';
    }
    foreach ($keys as $key) {
        if (isset($data[$key]) && (is_string($data[$key]) || is_numeric($data[$key]))) {
            return (string) $data[$key];
        }
    }
    foreach ($data as $value) {
        if (is_array($value)) {
            $found = mk_book_search($value, $keys, $depth + 1);
            if ($found !== '') {
                return $found;
            }
        }
    }
    return '';
}

function mk_book_log($message) {
    @file_put_contents(
        WP_CONTENT_DIR . '/uploads/' . MK_BOOK_LOG,
        date('c') . ' MK_BOOK_GRANT: ' . $message . PHP_EOL,
        FILE_APPEND
    );
}
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