using System;
using System.Collections.Generic;
using System.Text;
using System.Data.SqlClient;
using Csla;
using System.Data;
using Csla.Data;
using System.IO;
using log4net;

[assembly: log4net.Config.XmlConfigurator(Watch = true)]

namespace Volian.CSLA.Library
{
	[Serializable()]
	public class VEReadOnlyListBase<T, C> : ReadOnlyListBase<T, C>
		where T : VEReadOnlyListBase<T, C>
		where C : VEReadOnlyBase<C>, new()
	{
		#region Log4Net
		protected static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
		#endregion
		#region Authorization Rules

		public static bool CanGetObject()
		{
			// TODO: customize to check user role
			//return ApplicationContext.User.IsInRole("");
			return true;
		}

		#endregion
		#region Generic Factory Methods
		public static T Get(int id)
		{
			return DataPortal.Fetch<T>(new Criteria(id));
		}
		protected VEReadOnlyListBase()
		{ /* require use of factory methods */ }
		#endregion

		#region Generic Data Access
		[Serializable()]
		protected class Criteria
		{
			private int _id;
			public int Id
			{
				get { return _id; }
			}
			public Criteria(int id)
			{
				_id = id;
			}
		}
		protected void DataPortal_Fetch(Criteria criteria)
		{
			this.RaiseListChangedEvents = false;
//			if (log.IsDebugEnabled) log.Debug(this.GetType().ToString());
			try
			{
				using (SqlConnection cn = Database.VEPROMS_SqlConnection)
				{
					using (SqlCommand cm = cn.CreateCommand())
					{
						SetupSelect(cm, criteria);
						SqlDataReader drRaw = cm.ExecuteReader();
						using (SafeDataReader dr = new SafeDataReader(drRaw))
						{
							IsReadOnly = false;
							while (dr.Read())
							{
								CreateItem(dr);
							}
							IsReadOnly = true;
						}
					}
				}
			}
			catch (Exception ex)
			{
				//System.Diagnostics.StackFrame[] sf = new System.Diagnostics.StackTrace().GetFrames();
				//string sMsg = string.Format("{0}.{1} Exception: {2} \r\n  Message: {3}\r\n  Inner Exception:{4}",
				//  this.GetType().ToString(), sf[0].GetMethod().Name,
				//  ex.GetType().ToString(), ex.Message, ex.InnerException);
				//System.Diagnostics.EventLog.WriteEntry("VEReadOnlyListBase", sMsg);
				//Console.WriteLine(sMsg);
				if(log.IsErrorEnabled)log.Error("Fetch Error", ex);
			}
			this.RaiseListChangedEvents = true;
		}
		#endregion

		#region Item Specific Virtual Data Access
		protected virtual void SetupSelect(SqlCommand cm, Criteria criteria) { ;}
		protected virtual void CreateItem(SafeDataReader dr) { ;}
		#endregion
	}
}