//
// Authors:
//   Lucas Ontivero lucas.ontivero@gmail.com
//
// Copyright (C) 2014 Lucas Ontivero
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Xml;

namespace Open.Nat
{
    internal abstract class ResponseMessageBase
    {
        private readonly XmlDocument _document;
        protected string ServiceType;
        private readonly string _typeName;

        protected ResponseMessageBase(XmlDocument response, string serviceType, string typeName)
        {
            _document = response;
            ServiceType = serviceType;
            _typeName = typeName;
        }

        protected XmlNode GetNode()
        {
            var nsm = new XmlNamespaceManager(_document.NameTable);
            nsm.AddNamespace("responseNs", ServiceType);

            string typeName = _typeName;
            string messageName = typeName.Substring(0, typeName.Length - "Message".Length);
            XmlNode node = _document.SelectSingleNode("//responseNs:" + messageName, nsm);
            if (node == null) throw new InvalidOperationException("The response is invalid: " + messageName);

            return node;
        }
    }
}