//
// DynamicDataExtensions.cs
//
// Authors:
//	Atsushi Enomoto <atsushi@ximian.com>
//      Marek Habersack <mhabersack@novell.com>
//
// Copyright (C) 2008-2009 Novell Inc. http://novell.com
//

//
// 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.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Globalization;
using System.Security.Permissions;
using System.Security.Principal;
using System.Web.Caching;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.DynamicData.ModelProviders;

namespace System.Web.DynamicData
{
	[AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
	public static class DynamicDataExtensions
	{
		public static object ConvertEditedValue (this IFieldFormattingOptions formattingOptions, string value)
		{
			// Not a surprise anymore...
			if (formattingOptions == null)
				throw new NullReferenceException ();

			if (String.IsNullOrEmpty (value)) {
				if (formattingOptions.ConvertEmptyStringToNull)
					return null;
			} else {
				string nullDisplayText = formattingOptions.NullDisplayText;
				if (!String.IsNullOrEmpty (nullDisplayText) && String.Compare (value, nullDisplayText, StringComparison.Ordinal) == 0)
					return null;
			}

			return value;
		}

		[MonoTODO]
		public static void EnablePersistedSelection (this BaseDataBoundControl dataBoundControl)
		{
			throw new NotImplementedException ();
		}

		[MonoTODO]
		public static void ExpandDynamicWhereParameters (this IDynamicDataSource dataSource)
		{
			// http://forums.asp.net/p/1396453/3005197.aspx#3005197
		}

		[MonoTODO]
		public static IDynamicDataSource FindDataSourceControl (this Control current)
		{
			var control = current as BaseDataBoundControl;
			if (control == null)
				return null;

			string dataSourceID = control.DataSourceID;
			if (!String.IsNullOrEmpty (dataSourceID))
				return control.DataSource as IDynamicDataSource;
			
			Control namingContainer = control.NamingContainer;
			IDynamicDataSource dds;
			while (namingContainer != null) {
				dds = namingContainer.FindControl (dataSourceID) as IDynamicDataSource;
				if (dds != null)
					return dds;

				namingContainer = namingContainer.NamingContainer;
			}

			return null;
		}

		[MonoTODO]
		public static Control FindFieldTemplate (this Control control, string columnName)
		{
			throw new NotImplementedException ();
		}

		public static MetaTable FindMetaTable (this Control current)
		{
			// .NET doesn't perform the check, we will
			if (current == null)
				throw new NullReferenceException ();

			while (current != null) {
				DataBoundControl dbc = current as DataBoundControl;
				if (dbc != null) {
					IDynamicDataSource dds = dbc.DataSourceObject as IDynamicDataSource;
					if (dds != null)
						return dds.GetTable ();
				}

				current = current.NamingContainer;
			}

			return null;
		}

		[MonoTODO]
		public static string FormatEditValue (this IFieldFormattingOptions formattingOptions, object fieldValue)
		{
			throw new NotImplementedException ();
		}

		[MonoTODO]
		public static string FormatValue (this IFieldFormattingOptions formattingOptions, object fieldValue)
		{
			throw new NotImplementedException ();
		}

		static string GetDataSourceId (IDynamicDataSource dataSource)
		{
			Control c = dataSource as Control;
			if (c == null)
				return String.Empty;
			
			return c.ID;
		}
		
		public static MetaTable GetTable (this IDynamicDataSource dataSource)
		{
			if (dataSource == null)
				return null;

			string entitySetName = dataSource.EntitySetName;
			if (String.IsNullOrEmpty (entitySetName)) {
				// LAMESPEC: MSDN says we should throw in this case, but .NET calls
				// DynamicDataRouteHandler.GetRequestMetaTable(HttpContext
				// httpContext) instead (eventually)
				MetaTable ret = DynamicDataRouteHandler.GetRequestMetaTable (HttpContext.Current);
				if (ret == null)
					throw new InvalidOperationException ("The control '" + GetDataSourceId (dataSource) +
									     "' does not have a TableName property and a table name cannot be inferred from the URL.");
			}
			
			Type contextType = dataSource.ContextType;
			if (contextType == null)
				throw new InvalidOperationException ("The ContextType property of control '" + GetDataSourceId (dataSource) + "' must specify a data context");
			
			return MetaModel.GetModel (contextType).GetTable (entitySetName);
		}

		[MonoTODO]
		public static void LoadWithForeignKeys (this LinqDataSource dataSource, Type rowType)
		{
			throw new NotImplementedException ();
		}
	}
}