using Microsoft.SharePoint;
using System;
using System.Globalization;
using System.Xml;
namespace SPSolutions.SharePoint.Alerts
{
	public class SPAlertUtil
	{
		public static string GetFilter(SPView view)
		{
			return SPAlertUtil.GetFilter(view.ParentList.ParentWeb, view);
		}
		public static SPUser GetUserNoThrow(SPAlert alert)
		{
			if (alert == null)
			{
				throw new ArgumentNullException("alert");
			}
			SPUser result;
			try
			{
				result = alert.User;
			}
			catch (Exception)
			{
				result = null;
			}
			return result;
		}
		public static SPList GetListNoThrow(SPAlert alert)
		{
			if (alert == null)
			{
				throw new ArgumentNullException("alert");
			}
			SPList result;
			try
			{
				result = alert.List;
			}
			catch (Exception)
			{
				result = null;
			}
			return result;
		}
		public static string GetFilter(SPWeb web, SPView view)
		{
			if (view == null || view.Query == null || view.Query.IndexOf("<DateRangesOverlap>") > 0)
			{
				return null;
			}
			return SPAlertUtil.GetFilter(web, view.Query);
		}
		public static string GetFilter(SPWeb web, string queryXml)
		{
			if (string.IsNullOrEmpty(queryXml))
			{
				return null;
			}
			XmlDocument xmlDocument = new XmlDocument();
			xmlDocument.LoadXml("<Query>" + queryXml + "</Query>");
			XmlNode xmlNode = xmlDocument.SelectSingleNode("Query/Where");
			if (xmlNode == null)
			{
				return null;
			}
			if (!SPAlertUtil.IsValidFilter(web, xmlNode.InnerXml))
			{
				return null;
			}
			return string.Format("<Query>{0}</Query>", xmlNode.InnerXml);
		}
		public static string GetQuery(string queryXml)
		{
			if (string.IsNullOrEmpty(queryXml))
			{
				return null;
			}
			XmlDocument xmlDocument = new XmlDocument();
			xmlDocument.LoadXml("<Query>" + queryXml + "</Query>");
			XmlNode xmlNode = xmlDocument.SelectSingleNode("Query/Query");
			if (xmlNode == null)
			{
				return null;
			}
			return string.Format("<Where>{0}</Where>", xmlNode.InnerXml);
		}
		public static bool IsValidFilter(SPWeb web, string filterXml)
		{
			SPRequestWrapper sPRequestWrapper = new SPRequestWrapper(web);
			return sPRequestWrapper.ValidateSubscriptionFilter(filterXml);
		}
		public static void DeleteAlert(SPWeb web, SPAlert alert)
		{
            string listName = (alert.AlertType != SPAlertType.Custom) ? alert.List.ID.ToString("B").ToUpper(CultureInfo.InvariantCulture) : null;
            int itemId = (alert.AlertType == SPAlertType.Item) ? alert.ItemID : 0;
			int userId = (alert.User != null) ? alert.User.ID : 0;
			SPRequestWrapper sPRequestWrapper = new SPRequestWrapper(web);
            sPRequestWrapper.DeleteSubscription(web.Url, listName, alert.ID.ToString("D", CultureInfo.InvariantCulture), alert.AlertType == SPAlertType.Item, (uint)itemId, web.CurrentUser.IsSiteAdmin, userId);
		}
		public static bool IsValidDynamicRecipientField(SPField field)
		{
			return field != null && !field.Hidden && field is SPFieldUser;
		}
		public static void EnsureAlertProperty(SPAlert alert, string propertyName, string propertyValue)
		{
			if (alert.Properties.ContainsKey(propertyName))
			{
				alert.Properties[propertyName] = propertyValue;
				return;
			}
			alert.Properties.Add(propertyName, propertyValue);
		}
		public static void EnsureAlertProperty(SPAlert alert, string propertyName, object propertyValue)
		{
			SPAlertUtil.EnsureAlertProperty(alert, propertyName, propertyValue.ToString());
		}
	}
}