using System.Xml;

namespace Kreta.EESZTInterface
{
    public class XmlHelper
    {
        public const string EncryptedDataElementName = "EncryptedData";
        public const string EncryptedKeyElementName = "EncryptedKey";
        public const string SecurityElementName = "Security";
        public const string RequestSecurityTokenElementName = "RequestSecurityToken";
        public const string HeaderElementName = "Header";
        public const string BodyElementName = "Body";
        public const string SignatureElementName = "Signature";

        public static XmlElement GetElement(string element, string elementNS, XmlElement doc)
        {
            var list = doc.GetElementsByTagName(element, elementNS);
            return list.Count == 0 ? null : (XmlElement)list[0];
        }

        public static XmlElement GetElementId(XmlDocument doc, string id)
        {
            XmlElement idElem = null;

            if (idElem == null)
            {
                XmlNamespaceManager nsManager = new XmlNamespaceManager(doc.NameTable);
                nsManager.AddNamespace("wsu", Namespaces.wsuNs);

                idElem = doc.SelectSingleNode("//*[@wsu:Id=\"" + id + "\"]", nsManager) as XmlElement;
            }

            return idElem;
        }
    }
}