using System;
using System.Collections.Generic;
using System.Xml;

namespace Endpoint
{
	public class SoapEndpoint : HttpEndpoint
	{
		private Dictionary<string, string> _namespaceToUri;

		/// <summary>
		/// Gets the SOAP endpoint configuration.
		/// </summary>
		/// <value>The SOAP endpoint configuration.</value>
		public SoapEndpointConfiguration SoapEndpointConfiguration
		{
			get { return (SoapEndpointConfiguration)_httpEndpointConfiguration; }
		}

		/// <summary>
		/// Initializes a new instance of the <see cref="HttpEndpoint"/> class.
		/// </summary>
		/// <param name="config">The SoapEndpointConfiguration.</param>
		public SoapEndpoint(SoapEndpointConfiguration config)
			: base(config)
		{
			if (!string.IsNullOrEmpty(SoapEndpointConfiguration.XpathNamespaces))
			{
				string[] split = SoapEndpointConfiguration.XpathNamespaces.Split(',');
				if (split.Length != 2)
					throw new ArgumentException("Need a comma separated pair in XpathNamespaces.", "config");

				_namespaceToUri = new Dictionary<string, string>();
				_namespaceToUri.Add(split[0], split[1]);
			}
		}

		/// <summary>
		/// Gets the current status result of the endpoint
		/// </summary>
		/// <returns>Status</returns>
		public override Status GetStatus()
		{
			Status baseStatus = base.GetStatus();
			if (baseStatus != Status.Up)
				return baseStatus;

			try
			{
				Dictionary<string, string> headers = new Dictionary<string, string>
				                                     	{{"SOAPAction", SoapEndpointConfiguration.SoapAction}};

				XmlDocument xml = new XmlDocument();

				xml.LoadXml(GetUrlContent(SoapEndpointConfiguration.Uri, "text/xml; charset=utf-8", SoapEndpointConfiguration.SoapRequest, headers));

				XmlNodeList nodes;
				if (_namespaceToUri != null)
				{
					XmlNamespaceManager nsMgr = new XmlNamespaceManager(xml.NameTable);
					foreach (KeyValuePair<string, string> namespaceToUri in _namespaceToUri)
					{
						nsMgr.AddNamespace(namespaceToUri.Key, namespaceToUri.Value);
					}

					nodes = xml.SelectNodes(SoapEndpointConfiguration.XpathQuery, nsMgr);
				}
				else
					nodes = xml.SelectNodes(SoapEndpointConfiguration.XpathQuery);

				// xml.Save(@"c:\soap.xml");

				// verify response has expected value
				if (nodes == null || nodes.Count == 0)
				{
					StatusDescription = "Couldn't find expected value in SOAP response";
					return Status.Error;
				}
				string value = nodes[0].Value.Trim();
				if (value != SoapEndpointConfiguration.ExpectedXpathResult)
				{
					StatusDescription = String.Format("Result was: '{0}', was expecting '{1}'", value,
								  SoapEndpointConfiguration.ExpectedXpathResult);
					return Status.Error;
				}
			}
			catch (Exception ex)
			{
				StatusDescription = ex.Message;
				return Status.Error;
			}
			return Status.Up;
		}
	}
}